Fluorescent bleaching agent compositions

FIELD: chemistry.

SUBSTANCE: composition contains at least one fluorescent bleaching agent from bis-triazinylaminostilbene compounds containing taurine groups in a triazine nucleus, having formulae (1), (2) and (3). The composition is used to bleach paper in a wet process, in a gluing press or by coating.

EFFECT: increased whiteness.

25 cl, 2 dwg, 2 tbl, 3 ex

 

The present invention relates to compositions of fluorescent whitening agent, which includes a special encore-triazinetrione compounds containing turinawe group for whitening (bleaching) of paper.

In the pulp and paper industry there is a General trend towards the production of paper having a high degree of whiteness. Bleaching of paper is usually carried out by use of fluorescent whitening agent (FWA), to be applied before forming the paper into the paper pulp or after the manufacture of paper in the size press, or using the compositions for coating. In addition, it is possible to combine several of these methods.

Unexpectedly, it was found that the particular bis-triazinetrione compounds containing turinawe group, when used for bleaching paper give the paper with improved degree of whiteness. In particular, this also applies to cases where these compounds are used in combination with inorganic salts of bivalent cations, such as calcium chloride. Such salts are used in the paper industry to improve the performance of the printing machine, in particular, when ink printing.

Thus, the present invention relates to compositions suitable for the bleaching of paper, which is holding

(a) at least one fluorescent whitening agent (FWA) of formula (1), formula (2) or formula (3)

where

R independently represents hydrogen, C1-C3-alkyl or C1-C3-hydroxyalkyl;

R1, R2, R3and R4independently of one another represent hydrogen, cyano, C1-C4-alkyl, C2-C4-hydroxyalkyl,1-C4-alkoxy, where the alkyl is linear or branched; or R2and R1or R3and R4independently of each form with the N atom morpholino, piperidino or pyrolidine ring; or -(CH2)I-SO3M, where I is 1, 2 or 3; orwhere group-SO3M can be o-, m - or p-positions, a k is an integer from 0 to 3, preferably from 1 to 3; or -(CH2)i-COOR, -(CH2)iCONHP, -(CH2)i-COR, where i is an integer from 1 to 4, R represents a C1-C3-alkyl or identical M; and

M represents hydrogen or one equivalent of a cation, in particular Li, Na, K, CA, Mg, ammonium, or ammonium that is mono-, di-, tri - or Tetra-substituted C1-C4-alkyl or C2-C4-hydroxyalkyl;

provided that in SL the tea, when the fluorescent whitening agent of formula (1) is present, and fluorescent whitening agents (2) and (3) are absent, R is not hydrogen or stands.

The invention also relates to a method of bleaching paper in which the cellulose mass and/or pulp sheet is brought into contact with the composition according to the above definition. In addition, the invention relates to a paper produced using this method. The invention also relates to the use of a composition for bleaching paper according to the above definition. Preferred embodiments of the invention are described using the following description (including examples), claims and graphic materials.

A BRIEF DESCRIPTION of GRAPHIC MATERIALS

Figure 1 is a graph showing bleaching characteristics of different fluorescent whitening agents (FWA).

Figure 2 is a graph showing bleaching characteristics of different fluorescent whitening agents (FWA) in the presence of a salt of a bivalent cation.

According to a preferred variant of the invention, the composition is suitable for bleaching paper, is a solution for size press, and the method is a method of bleaching paper size is Resse, where the sheet of pulp is brought into contact with the solution for size press.

In the context of this invention under size press means the unit for applying the surface layer, preferably composed of paper machine, in which the formed sheet of pulp is brought into contact with the solution for size press and in which the proportion of the solution, subject to absorption sheet (absorption solution), can be preferably adjusted by means of the pressure roll.

Similarly assumes that the last modification size press or film press, namely Speedsizer, Symsizer and Gate-roll, fall under the concept of the size press.

According to another preferred variant of the invention, the composition is suitable for bleaching paper, is a composition for coating or covering layer, and the method is a method of bleaching paper, in which the sheet of pulp is brought into contact with a composition for coating or covering layer.

According to another preferred variant of the invention, the composition is suitable for bleaching paper, is a composition for wet end of the machine, and the method is a method of bleaching paper, where the pulp mass or suspension of pulp is brought into contact with the uke is Anna composition.

According to the invention, the composition comprises at least one bis-triazinetrione connection defined above, of formula (1), (2) or (3). According to a preferred variant implementation, R, R1and R3represent hydrogen, a R2and R4both are 2,5-disulphophenyl. According to another preferred variant implementation, R is the stands, R1and R3are hydrogen, a R2and R4both are 2,5-disulphophenyl.

The preferred option M is hydrogen, Na, K, CA, MD, in particular, M is Na or K, most preferred Na.

Fluorescent whitening agents of formula (1), (2) and (3) can be obtained analogously to methods known in the art. For example, fluorescent whitening agents can be obtained by the reaction of cyanuric chloride with an amine or aniline or their derivatives, 4,4'-diaminostilbene-2,2'-disulphonate or its salt and taurinum compound or mixture cabrinovic/detouring compounds. Alternatively, the compounds of formula (1), (2) and (3) can also be obtained separately using known methods and after getting mixed with each other. Suitable methods are described in the examples below. Fluorescent whitening agents of formula (1), where R represents hydrogen or methyl, known from the example of the patent document WO 03/044275 A1.

The composition of the invention may contain two or three fluorescent whitening agent of formula (1), (2) or (3). Generally speaking, the composition of the invention may include one of the following options:

fluorescent whitening agent of formula (1) with the condition defined above;

fluorescent whitening agent of the formula (2);

fluorescent whitening agent of formula (3);

fluorescent whitening agents of the formulae (1) and (2);

fluorescent whitening agents of the formulae (1) and (3);

fluorescent whitening agents of the formulae (2) and (3); or

fluorescent whitening agents of formula (1), (2) and (3).

Most preferably the compositions contain fluorescent whitening agents of formula (1), (2) and (3). The composition may contain one or more fluorescent whitening agents of formula (1), (2) and/or (3). The composition may also contain one or more known fluorescent whitening agents based on bis-triethynylbenzene or distributional.

The composition of the invention preferably contains a fluorescent whitening agent of formula (1) in an amount of from 0 to 99 wt.%, preferably from 20 to 95 wt.%, most preferably from 50 to 95 wt.%; fluorescent whitening agent of the formula (2) in an amount of from 0 to 90 wt.%, preferably from 0.1 to 60 wt.%,most preferably from 1 to 30 wt.%; and fluorescent whitening agent of formula (3) in an amount of from 0.1 to 50 wt.%, preferably from 0.1 to 30 wt.%, most preferably from 0.1 to 20 wt.%; in each case per 100 mass% component (a). According to another preferred variant of the invention, the composition comprises a fluorescent whitening agent of formula (1) in an amount of from 0 to 99 wt.%, fluorescent whitening agent of the formula (2) in an amount of from 0 to 90 wt.% and fluorescent whitening agent of formula (3) in an amount of from 0 to 50 wt.%, in each case per 100 mass% component (a).

The composition of the invention can be used in any commercially available form, for example, in the form of powders or granules, soluble water, or it can be used in the form of aqueous composition, the aqueous solution or aqueous dispersion or aqueous composition directly with production. According to a preferred variant implementation, the composition is an aqueous composition. According to another preferred variant implementation, the composition of the invention contains as component (b) water, preferably in an amount of from 40 to 99 wt.%, preferably from 60 to 97 wt.%, most preferably from 70 to 95 wt.%, in each case per 100 mass% song.

Depending on the application of the composition of the image is to be placed may contain carriers, sizing agents, salt of the divalent cation, and in relatively small quantities, usually in amounts less than 10 wt.%, additional excipients, such as, for example, dispersing agents, thickeners, antifreeze agents, preservatives, complexing agents, and the like, or in the composition of the invention may contain organic by-products of the synthesis of the fluorescent whitening agent is not completely removed during processing. According to a preferred variant of the invention, the composition is a solution for size press containing a fluorescent whitening agent such as defined above (component (a)), water (component (b)) and at least one carrier and/or a sizing agent. According to another preferred variant of the invention, the composition is a composition for coating or coating layer containing a fluorescent whitening agent such as defined above (component (a)), water (component (b)at least one binder and/or pigment and, optionally, at least one carrier and/or covetous substance.

Acceptable carriers are compounds used in the art as a carrier, in particular as carriers suitable for RA the solutions for size press or compositions for coating. The preferred carriers are carboxymethylcellulose (CMC), polyvinyl alcohol (PVA), starch or mixtures thereof, the most preferred starch. Suitable carrier substances are, for example, hydrophilic polymers capable of forming hydrogen bonds. Preferred carrier substances include starch, polyvinyl alcohols, carboxymethylcellulose and polyethylene glycols having srednekamennogo molecular weight of from 200 to 8000 g/mol, and also any desired mixtures of these substances, however, these polymers may not necessarily be modified. Preferred are polyvinyl alcohols having a degree of hydrolysis of >85%, preferably carboxymethylcellulose have a degree of substitution DS>0.5 in. Particularly preferred glycols having srednekamennogo molecular weight Mn of 200 to 8000 g/mol. Suitable are, for example, but not limited to, starches, potato starch, rice starch, wheat starch, corn starch or manioc starch. In particular, instead of natural starches preferably used starches, whose molecular weight is reduced due to partial cleavage and/or obtained by derivatization. In addition, suitable starches for which United both phases of modification, which is partially split or additionally derivateservlet starches. To the usual ways of splitting starches include, for example, enzymatic, oxidative, thermal or hydrolytic treatment. Examples of suitable derivatives of starches are gidroksietilirovanny starch or cationic starch.

Suitable sizing agents are alkenylamine dimers, alkylcatechols dimer (AKD), alkynylamino anhydride (ASA), rosin size, copolymers of styrene and maleic anhydride, stirolakrilat, copolymers of styrene and acrylic acid, polyurethane or copolymers of ethylene and acrylic acid, or other conventional reagents for paper, such as styryl-acrylate copolymers, rubber, pigments, defoamers or salt, such as NaCl or NaHCO3or a mixture of two or more of them. In the case of the use of sizing agents, their number ranges from 0 to 5, in particular from 0 to 4, most preferably from 0 to 3, in each case, in wt.% per 100 wt.% song.

The coating layers or compositions for coating subject to bleaching, in accordance with the invention contain as a latex binder, for example, structure (grid) based on styrene/butadiene, styrene/acrylate or vinyl acetate. Such polymers optionally may be modified with additional monomers, such as Acrylonitrile, acrylamide, α,β-nanosys is installed carboxylic acid, such as acrylic acid, methacrylic acid, taconova acid or maleic acid, acrylates, vinyl esters, ethylene, vinyl chloride, vinylidenechloride and so on. In most cases fit all traditional latex binder used to obtain the coating layers or compositions for coating paper. The coating layers or compositions for coating can contain as synthetic covetously agents substances differing from the above, for example, carboxymethylcellulose, hydroxyethylcellulose and/or polyvinyl alcohol and synthetic thickeners based on acrylate.

Preferred are the latex binder based on styrene/butadiene. Preferred covetously agents are polyvinyl alcohols, particularly alcohols having a degree of hydrolysis of >85%, and in particular, with the viscosity by Brookfield in the range 2-80 MPa (measured for a 4% aqueous solution at 20°C), carboxymethyl cellulose, in particular having a degree of substitution of>0.5 and in particular, with density Brookfield in the range of about 5 to 5000 MPa (measured for a 2% aqueous solution at 20°C), as well as mixtures of these two substances.

The coating layers or compositions for coating subject to bleaching, in accordance with the invention is predpochtitelno also contain white pigments.

Commonly used white pigments are calcium carbonate in natural or precipitated form, kaolin, talc, titanium dioxide, satinet, aluminum hydroxide and barium sulfate, often in the form of a mixture.

Suitable salt of the divalent cation include divalent cations, preferably cations of alkaline earth metal, particularly calcium or magnesium. Preferably, the counterions of the divalent cations were mono - and polyvalent anions, in particular a halide, sulfate, hydrosulfate, phosphate, hydrogen phosphate, dihydrophosphate, carbonate, bicarbonate, nitrate, acetate or a mixture thereof, preferably the chloride or sulfate, the preferred chloride. The preferred salt is calcium chloride, magnesium chloride, magnesium sulfate, or a mixture thereof; more preferred calcium chloride, magnesium chloride or a mixture thereof; most preferred calcium chloride.

The composition may be obtained using known methods and preferably by combining the aqueous fluorescent whitening agent used as component (a)preferably has a suitable pH value, with other components such as carriers, sizing agents, binders, pigments, salts or normalizing agents.

The method of the invention for bleaching paper is implemented is consistent with the known processes, preferably using a size press or by coating, and is not subject to any restrictions. Used paper is not critical and can be obtained from any pulp or may be a sheet of pulp.

The paper obtained by the method of the invention has superior whiteness and in the case of using a salt of the divalent cation is particularly well suited for inkjet printing.

White received the paper can be characterized using white on ClE (International Commission on illumination). In accordance with the brightness ClE can be compared with each other various fluorescent whitening agents in terms of their saturation. In other words, if you are using a larger amount of the fluorescent whitening agent is not observed no further increase in whiteness, it shows the characteristic saturation and using greater quantities can be even negative impact on white. The effect of saturation is also known as Browning. Limit darkening, i.e. the point at which the increase in the number of used fluorescent whitening agent essentially does not lead to further increase in the degree of whiteness can be determined, for example, from the diagram a*-b*, where a* and b* are the coordinates of the vechnosti in the system ClE-L*a*b.

The invention also relates to the use of a composition of the invention for bleaching paper with using a composition such as defined above.

The following examples illustrate the invention and demonstrate the preferred embodiments of without restricting the scope of legal protection.

EXAMPLES

Example 1

Stage 1: reaction of cirurgia with Dimethylol acid

In a flask with a capacity of 2 l, equipped with a stirrer, pH electrode, thermometer and refrigerator, load 600 ml of water at a temperature of 8°C and 100 g (0.54 mol) of cyanuric chloride. After the pH will decrease to 4.5 for 45 minutes add 592 high (0.56 mol) of 25% wt./mass. solution Dimethylol acid. The pH value is maintained at the level of 2.3 with simultaneous addition of 10% sodium hydroxide solution as it is heated mixture to a temperature of 12°C. After addition of a solution Dimethylol acid the mixture is stirred for 3 hours at a temperature of 12°C and a pH of 2.3. After this time the temperature was raised to 30°C, the reaction is finished, the pH value at this support level to 5.2 by adding 10% sodium hydroxide solution.

Stage 2: the reaction of the intermediate stage 1 with 4,4'-diamino-2,2'-disulphonate

A solution containing to 112.2 g (0.27 mol) of the disodium salt of 4,4'-diamino-2,2'-disulfonate, 835 g of water and 222 g of 10% aqueous solution of carbon is sodium was added to the solution from step 1. During the addition the pH value of the solution to support constant ( pH=5,2), and the temperature is gradually raised to 65°C. the Solution is stirred at a temperature of 65°C and pH 5.2 to the end of the addition of a solution of 4,4 diamino-2.2 dissolvability.

Stage 3: the reaction of the intermediate from step 2 with taurine (1), (R, R1, R3=H; R2, R4=C6H3(SO3Na)2)

and 67.8 g (0.54 mol) of taurine in the form of a 20% aqueous solution was added to the solution from stage 2 for 20 minutes. The pH value constant support on level 8 with simultaneous addition of 10% sodium hydroxide solution, heating the mixture to a temperature of 100°C. After that the reaction mixture is heated at a temperature of about 100°C and pH 8 for 3 more hours. The resulting solution is cooled to a temperature of approximately 50°C and filtered to obtain a solution of the compound of formula 1, 371 g (87.3 per cent).

Example 2 (R, R1, R3=H; R2, R4=C6H3(SO3Na)2)

and 67.8 g (0.54 mol) of a mixture of taurine/titurin (5/1 mass./mass.) in the form of a 20% aqueous solution was added to the solution from step 2 of Example 1 for 20 minutes. The pH value constant support on level 8 with simultaneous addition of 10% sodium hydroxide solution, while heating the mixture to a temperature of 100°C. Then the reaction mixture is stirred the ri temperature of about 100°C and pH 8 for 3 more hours. The resulting solution is cooled to a temperature of approximately 50°C and filtered to obtain a solution mixture 1 (78,7%), 2 (4,8%) and 3 (16,5%) with a total yield of 362 g (to 85.2%).

Example 3 (R, R1, R3=H; R2, R4=C6H3(SO3Ma)2)

The solution from stage 2 of example 1 is heated to a temperature of 60°C., then added dropwise within 1 hour is added and 67.8 g (0.54 mol) of a mixture of taurine/titurin (5/1 mass./mass.) in the form of a 20% aqueous solution. The pH value constant support on level 8 with simultaneous addition of 10% sodium hydroxide solution, while heating the mixture to a temperature of 100°C. Then the reaction mixture is stirred at a temperature of about 100°C and pH 8 for 3 more hours. The resulting solution is cooled to a temperature of approximately 50°C and filtered to obtain a solution mixture 1 (84%), 2 (5,1%) and 3 (10,9%) with a total output of 354 g (83,3%).

Comparative FWA 1 (R=CH3; R1, R3=H; R2, R4=C6H3(SO3Na)2)

to 74.5 g (0.54 mol) of N-methyltaurine added to the solution from step 2 of Example 1 for 20 minutes. The pH value constant support on level 8 with simultaneous addition of 10% sodium hydroxide solution, while heating the mixture to a temperature of 100°C. Then the reaction mixture is stirred at a temperature of about 100°C and pH 8 for it is 3 hours. The resulting solution is cooled to a temperature of approximately 50°C and filtered to obtain a solution of the compound of formula 1, 383 g (88,7,3%).

We have received the following fluorescent whitening agents and mixtures, where M always mean sodium, and where the standard FWA means comparative FWA 1. As shown hereinafter in the examples below as a comparative FWA 2 in order to compare use Blankophor UWS.

Standard FWA

Blankophor UWS

Example 1

Example 2

Example 3

These fluorescent whitening agents and mixtures were used in the following application examples.

Application example 1

The bleaching properties of various fluorescent whitening agents studied using the following methods of testing for size press/press.

Prepared 15% starch solution neutral potato starch (PerfectamyI 4692). The tests were carried out for 10% starch solution. Quantity (in terms of dry paper) fluorescent whitening agent comprising 0 and-0.5%, put on paper. 1.6 g/m2dry starch was applied at 80 g/m2base paper, which is a paper machine production, taped and slightly bleached using a fluorescent whitening agent.

First, the fluorescent whitening agent was weighed in a glass and added 13,33 g starch solution. Then the solution was filled up with water to 20 g, so that the tests were conducted in 10% starch solution. Field mixing within a short time, the solution was applied on one side of the base paper using a semi-automatic laboratory equipment for the deposition of coatings with Rakel (No.0), which must model used in the film press. After pulling the paper immediately dried on a drying cylinder at a temperature of about 100°C. After conditioning the air during the night the prepared side of the paper was evaluated using a spectrometer Datacolor (IS02469), defining ClE, L*, a* and b*, while the used light source based on the standard ISO2469.

The used amount of the fluorescent whitening agent per 100 g of starch preparation was from 0.28 to 1.12%, as shown in Table 1.

The results obtained are presented in Table 1 and shown in Figure 1.

Table 1/td>
FWAAmount (wt.%) FWA in starch productWhite on CIEL*a*b*
Example 10,28128,0594,102,30-9,38
0,56135,1194,30of 2.51-10,88
0,84138,1694,372,54-11,53
1,12139,4794,432,43-11,79
Example 20,28128,8694,092,48-9,58
0,56135,6994,302,71-11,01
0,84 139,0094,372,74-11,72
1,12141,0394,472,71-12,13
Example 30,28127,5394,042,37-9,30
0,56135,6694,232,72-11,03
0,84139,1394,392,75-11,74
1,12140,9594,422,73-12,14
Comparative FWA 10,28126,8694,032,31-9,16
0,56133,7994,222,56-10,62
0,84137,1994,312,62-11,34
1,12139,7894,352,61-11,90
Comparative FWA 20,28126,9993,992,19-9,20
0,56133,19a 94.22,32-10,49
0,84135,9194,402,23-11,01
1,12136,8094,482,05-11,17

Application example 2

The bleaching properties of various fluorescent whitening agents studied in the presence of calcium chloride.

The test method was the same as that described in application Example 1, except that the added calcium chloride as indicated below. Prepared 50% solution of calcium chloride. The amount of calcium chloride,printed on paper, was 0.8%. After weighing the fluorescent whitening agent in a glass and add 13,33 g 15% starch solution were weighed solution of calcium chloride and the solution was filled up with water to 20 g

The used amount of the fluorescent whitening agent per 100 g starch of the drug ranged from 0.24 to 0,73%, as shown in Table 2.

The results are shown in Table 2 and presented in figure 2.

Table 2
FWAAmount (wt.%) FWA in starch productWhite on CIEL*a*b*
Example 10,24128,1993,952,22-9,48
0,49134,2494,182,28-10,73
0,73136,4494,342,16-11,15
Example 2 0,24129,6994,012,17-9,34
0,49135,6894,212,24-10,59
0,73138,2794,342,15-11,11
Example 30,24129,0094,051,99-9,07
0,49135,2494,242,02-10,31
0,73137,0894,322,01-10,91
Comparative FWA 10,24127.31 sq.m93,992,05-9,26
0,49133,5194,172,12-10,57
0,73133,9394,332,03-10,59

1. The composition is suitable for the bleaching of paper, characterized in that it contains
(a) at least one fluorescent whitening agent of formula (1), formula (2) or formula (3)



where R independently represents hydrogen, C1-C3-alkyl or C1-C3-hydroxyalkyl;
R1, R2, R3and R4independently of one another represent hydrogen, cyano, C1-C4-alkyl, C2-C4-hydroxyalkyl, C1-C4-alkoxy, where the alkyl is linear or branched; or
R2and R1or R3and R4independently of each form with the N atom morpholino, piperidino or pyrolidine ring; or
-(CH2)I-SO3M, where I is 1, 2 or 3; orwhere groups
-SO3M can be o-, m - or p-positions, and k is an integer from 0 to 3; or -(CH2)i-COOR, -(CH2)i-CONHR, -(CH2)i-COR, where i is an integer from 1 to 4, R represents a C1-C3-alkyl or corresponds to M; and
M represents adored or one equivalent of a cation, in particular, Li, Na, K, Ca, Mg, ammonium, or ammonium that is mono-, di-, tri - or Tetra-substituted C1-C4-alkyl or C2-C4-hydroxyalkyl;
provided that when the fluorescent whitening agent of formula (1) is present, and fluorescent whitening agents (2) and (3) are absent, R is not hydrogen or stands,
where fluorescent whitening agent of formula (1) is present in an amount of from 20 to 95 wt.% per 100 wt.% component (a).

2. The composition according to claim 1, characterized in that R, R1and R3are hydrogen, a R2and R4both are 2,5-disulphophenyl.

3. The composition according to claim 1, characterized in that R is stands, R1and R3are hydrogen, a R2and R4both are 2,5-disulphophenyl.

4. The composition according to claim 1, wherein M is Na or K.

5. The composition according to claim 2, wherein M is Na or K.

6. The composition according to claim 3, wherein M is Na or K.

7. The composition according to claim 1, characterized in that it contains two or three fluorescent whitening agent of formula (1), formula (2) and/or formula (3).

8. The composition according to claim 2, characterized in that it contains two or three fluorescent whitening agent of formula (1), formula (2) and/or formula (3).

9. The composition according to claim 3, characterized in that it contains two or three fluorescent on bellevuewa agent of formula (1), formulas (2) and/or formula (3).

10. The composition according to claim 1, characterized in that it contains the fluorescent whitening agents of formula (1), (2) and (3).

11. The composition according to claim 2, characterized in that it contains the fluorescent whitening agents of formula (1), (2) and (3).

12. The composition according to claim 3, characterized in that it contains the fluorescent whitening agents of formula (1), (2) and (3).

13. The composition according to claim 1, characterized in that it contains a fluorescent whitening agent of the formula (2) in an amount of from 0.1 to 60 wt.% and fluorescent whitening agent of formula (3) in an amount of from 0.1 to 30 wt.% in each case per 100 wt.% component (a).

14. The composition according to claim 1, characterized in that it is an aqueous composition.

15. The composition according to claim 2, characterized in that it is an aqueous composition.

16. The composition according to claim 3, characterized in that it is an aqueous composition.

17. The composition according to claim 4, characterized in that it is an aqueous composition.

18. The composition according to claim 1, characterized in that it is a solution for size press.

19. The composition according to claim 1, characterized in that it is a composition for coating or covering layer.

20. Composition according to any one of the preceding paragraphs, characterized in that it contains salt of the divalent cation.

21. The method of bleaching paper, the tives such as those that pulp mass or suspension of pulp is brought into contact with a composition according to any one of claims 1 to 18 and 20.

22. The method of bleaching paper, characterized in that the sheet of pulp is brought into contact with a composition according to any one of claims 1 to 20.

23. The method according to item 22, wherein the sheet of pulp is brought into contact with the composition for sizing press or by coating.

24. Paper produced using the method according to any of PP-23.

25. The use of a composition according to any one of claims 1 to 20 for whitening paper.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention includes (a) at least one optical bleaching agent of formula (1) , wherein R1 denotes hydrogen or SO3M, R2 denotes hydrogen or SO3M, R3 denotes hydrogen or CH2CO2M, R4 denotes CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M, where M denotes hydrogen, a cation of an alkali metal, ammonia, mono-methyl-di-C2-C3-hydroxyalkylammonium, dimethyl-mono-C2-C3- hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C2-C3 hydroxyalkyl radical, or a mixture of said compounds, (b) a magnesium salt or (c) binder, which is selected from a group consisting of natural starch, enzyme-modified starch, and chemically modified starch, wherein there are 0.1-15 parts of component (b) for one part of component (a). The invention also relates to a method of bleaching paper using said composition.

EFFECT: composition is a more efficient means of achieving high paper whiteness.

9 cl, 4 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a compound of formula (1) where R1 denotes hydrogen or SO3, R2 denotes hydrogen or SO3, R3 denotes hydrogen or CH2CO2, R4 denotes CH2CO2, CH(CO2)CH2CO2 or CH(CO2)CH2CH2CO2, and where M denotes a stoichiometric cation equivalent required to balance the anionic charge in formula (1) and is a combination of Mg2+ with at least 1 additional cation. The additional cations are selected from a group consisting of H+, a cation of an alkali metal, a cation of an alkali-earth metal other than Mg2+, ammonium, mono-C1-C4 alkyl-di-C2-C3-hydroxyalkylammonium, di-C1-C4-alkyl-mono-C2-C3-hydroxyalkylammonium, ammonium, which is mono-, di- or trisubstituted with a C2-C3 hydroxyalkyl radical, and mixtures thereof. The invention also relates to versions of the method of producing said compound and use of said compound in binding compositions for bleaching paper.

EFFECT: compound is a more efficient paper bleaching agent.

8 cl, 4 tbl, 10 ex

FIELD: textiles, paper.

SUBSTANCE: in one of the aspects, the invention is directed to a method which enables mainly to maintain (or even increase) the brightness and/or whiteness of paper with increased degree of grinding the cellulose pulp, where the said method comprises grinding of the cellulose pulp till the freeness value of about 100 CSF and adding the composition OVA and a polymeric carrier to the paper surface in the size press in amounts sufficient to increase brightness and/or whiteness of the paper obtained. In another aspect, the invention is directed to a method of making paper from grinded cellulose pulp, which comprises grinding the suspension of cellulosic fiber to reduce the freeness up to about 100 CSF and mixing the cellulosic fiber with at least one optical bleaching agent (OBA) during or after the grinding stage and prior to adding any additional chemical ingredients of the wet stage of production.

EFFECT: effective maintenance or increase of brightness and whiteness of paper from the grinded cellulose pulp.

13 cl, 14 tbl, 34 dwg

FIELD: textiles, paper.

SUBSTANCE: method comprises the following steps: a) adding a known amount of one or more surface additives to a papermaking process in a known proportion with a known amount of one or more inert fluorescent markers, and the inert fluorescent markers are selected from the group consisting of fluorescein or derivatives of fluorescein and rhodamine, or derivatives of rhodamine, b) measuring the fluorescence of one or more inert fluorescent markers in the point after adding the surface additives and after the web formation, at that fluorescence is measured with a fluorometer of reflective type, c) establishing the correlation between the fluorescence value of the inert fluorescent markers on the web and the concentration of surface additives in the coating on the web and/or coating thickness on the web.

EFFECT: use of the proposed method enables paper machine to control the rate of adding at very low levels, with ability to assess quickly and regulate statically rate of adding beyond the technical specifications.

17 cl, 1 ex, 2 dwg

FIELD: chemistry.

SUBSTANCE: described is an aqueous solution of an optical brightener, containing (a) 10-50 wt % optical brightener of formula (I): where: M is hydrogen, an alkali metal atom, ammonia or an amine cation; R1 is hydrogen, C1-C4-alkyl or C2-C4-hydroxyalkyl; R2 - C1-C4-alkyl which can be substituted with -CN- or -CONH2-group or C2-C4-hydroxyalkyl; or R1 and R2 together with a nitrogen atom close a morpholine ring; (b) 0.5-9 wt % polyvinyl alcohol, having degree of hydrolysis 71-85.2% and Brookfield viscosity 3-5.4 mPa·s; and (c) water. The invention also describes use of said solution in a coating composition for paper and a method of obtaining paper coated with said coating composition.

EFFECT: disclosed aqueous solutions of optical brighteners have low viscosity, can be used directly by paper manufacturers and can be fed by a pump directly into the coating composition to provide a coating on paper with high whiteness.

10 cl, 2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: water-soluble composition contains a) at least one water-soluble optical bleaching agent, b) a polymer obtained from an ethylenically unsaturated monomer or a monomer mixture, characterised by that at least one monomer is an acrylamide and the water-soluble polymer has average (weight-average) molecular weight between 500 and 49000, optionally c) polyethylene glycol with weight-average molecular weight between 500 and 6000, and d) water. Said composition is used to optically bleach paper.

EFFECT: high degree of bleaching while preserving rheological properties.

7 cl, 7 tbl, 70 ex

FIELD: textile, paper.

SUBSTANCE: full bleaching/extraction of craft cellulose fibres is carried out with a chorine agent. Afterwards fibres are washed and exposed to contact in solution with at least one optical bleach (OB) upstream the mixing box and the discharge box of the machine. Fibres in solution have consistency from 7 to 15%, pH of solution in process of contact of fibres with OB makes from 3.5 to 5.5, temperature of contact makes from 60 to 80°C, and time of contact is from 0.5 to 6 hours. Additional contact of OB with fibres is carried out in the device for coating application or in the gluing press. Contact may be carried out at the stage of storage, both at high density and low density of the craft-cellulose fibres, and also at the stage of refinement.

EFFECT: improved whiteness and brightness of fibres when using lower quantity of OB.

19 cl, 11 dwg, 12 tbl, 6 ex

FIELD: textile, paper.

SUBSTANCE: method concerns reducing speed of photoyellowing of paper containing mechanical pulp. The method includes coating the surface of a paper sheet during papermaking of aqueous solution containing an effective amount of one or more salts of thiocyanic acid.

EFFECT: improvement of stability to photoyellowing of paper and cost-effective way while reducing its toxicity.

16 cl, 10 tbl

FIELD: textile, paper.

SUBSTANCE: method includes formation of composition, containing water, raw starch and powder optical refining agent. Boiling of composition. Application of finished composition, at least on one surface of paper or cardboard base in coating press. Then base is dried. In another version of method composition is boiled at the temperature up to 299°F inclusive.

EFFECT: improved brightness of paper and cardboard.

7 cl, 4 dwg, 8 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention describes an aqueous dispersion of an optical bleaching agent which is stable during storage, does not contain dispersants and stabilisers and contains 20-40% active substance in form of one or more optical bleaching agents obtained through successive reaction of cyanuric chloride with 4,4'-diamino-2,2'- stilbene sulphonic acid, amine and a product of reacting monoethanol amine with acrylamide.

EFFECT: disclosed dispersion of optical bleaching agent does not require dispersants or other stabilising additives to prevent settling during storage and has excellent properties for bleaching paper and other cellulose materials.

8 cl, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to solutions of optical bleaching agents which are stable during storage, based on defined salt forms of aniline-substituted bis-triazinyl derivatives of 4,4'-diaminostilbene-2,2'-disulphonic acid of formula where R denotes a hydrogen atom, R1 denotes a β-hydroxyalkyl radical having 2-4 carbon atoms, R2 denotes a hydrogen atom, M+ denotes Na+, n is less than or equal to 1.5; which do not require additional dissolution promoting additives.

EFFECT: high stability of the compounds during storage.

14 cl, 2 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention describes an aqueous dispersion of an optical bleaching agent which is stable during storage, does not contain dispersants and stabilisers and contains 20-40% active substance in form of one or more optical bleaching agents obtained through successive reaction of cyanuric chloride with 4,4'-diamino-2,2'- stilbene sulphonic acid, amine and a product of reacting monoethanol amine with acrylamide.

EFFECT: disclosed dispersion of optical bleaching agent does not require dispersants or other stabilising additives to prevent settling during storage and has excellent properties for bleaching paper and other cellulose materials.

8 cl, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to concentrated aqueous solutions of hexa-sulfonated stilbene used optical brighteners. Description is given of an aqueous solution of hexa-sulfonated stilbene optical brightener which is stable during storage with over 0.214 mol/kg content thereof in the solution. The solution does not contain a soluble agent, for example urea. By removing salts formed during synthesis of the optical brightener, its concentration of up to 0.35 mol/kg can be achieved without losing stability during storage. Also described is a method of preparing an aqueous solution of the said optical brightener and its use for bleaching paper or cellulose materials.

EFFECT: high concentration solutions of the said optical brightener do not show crystallisation signs after 2 weeks at 5°C and enables formation of coating compositions with low water content, which reduces energy consumption on drying and reduces penetration of water and adhesive into the paper layer.

10 cl, 1 dwg, 1 tbl, 3 ex

FIELD: textile fabrics, paper.

SUBSTANCE: aqueous solutions are related to toluylene optical bleaches and may be used in production of chalk overlay paper of high whiteness. Aqueous solutions contain at least one optical bleach, polyvinyl alcohol, having extent of hydrolysis over 75% and Brookfield viscosity of 2-40 mPa·s, and water. This composition may be used for paper coating. It may be applied on paper after its moulding to produce chalk overlay paper.

EFFECT: provision of stability in storage of aqueous solutions of toluylene optical bleaches and simplified method for production of chalk overlay paper.

9 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: described is a composition, containing (A) 2 to 30 wt % composition of amino alcohol - 2-amino-2-methyl-1-propanol with formula (1), and (B) 70 to 98 wt % composition of fluorescent optical bleaching agent with formula (2) , where X - is hydrogen, ion of alkali metal or ammonium, or hydroxyalkylammonium radical, derived from amino alcohol (1); R7, R8, R9 and R10 - -OR11, -NR11R12 or , where R11 and R12 - is hydrogen, alkyl, hydroxyalkyl, alkoxyalkyl, carboxyalkyl, dicarboxyalkyl, H2N-CO-alkyl or alkylthio group.

EFFECT: high solubility in water and increased stability when storing its aqueous solutions.

4 cl, 3 tbl, 3 ex

FIELD: chemistry, textiles, paper.

SUBSTANCE: present invention relates to new amphoteric bis-triazinylaminostilbene fluorescent whitening agents for fluorescent whitening of organic materials, particularly paper. Description is given of use of compounds with formula (5) for fluorescent whitening of paper.

EFFECT: compounds have high bleaching power; fluorescence is not prevented by cation-active polymers or anion-active fluorescent whitening agents contained in the paper.

2 cl, 2 tbl, 48 ex

FIELD: chemistry.

SUBSTANCE: invention concerns fluorescent bleach containing a mix of two asymmetrically substituted and one symmetrically substituted triazinylaminostilbene disulfone acid, a new symmetrically substituted derivative, method of their obtaining, and application of the mix in synthetic or natural organic material (especially paper) bleaching and in fluorescent bleaching and sun resistance boost of textile.

EFFECT: high substantivity and light resistance of the claimed fluorescent bleaches and their mixes, and better water solubility of the claimed mixes in comparison to the solubility of each individual bleach.

15 cl, 2 tbl, 12 ex

FIELD: household chemistry, in particular compositions for bleaching of white and random dyeing textile made of natural, artificial, synthetic and mixed fibers.

SUBSTANCE: claimed composition contains (mass %): hydrogen peroxide 7-11; oxanole 0.5-1.0; oxyethylidenediphosphonic acid 0.1-0.3; optical bleaching agent, namely mixture of benzoxyzaryl derivative 0.1-0.2 and stilbenesulfo acid 0.1-0.2; and balance: water.

EFFECT: non-layered composition during storage; decreased chemical failure of materials.

2 tbl, 12 ex

FIELD: organic chemistry, paper industry.

SUBSTANCE: invention relates to compositions used for coating paper covers. Invention describes a composition for coating paper cover comprising whitening pigment comprising: (a) product of melamine formaldehyde or phenol-formaldehyde polycondensation, and (b) water-soluble fluorescent whitening agent of the formula:

wherein R1 and R2 represent independently of one another -OH, -Cl, -NH2, -O-(C1-C4)-alkyl, -O-aryl, -NH-(C1-C4)-alkyl, -N-(C1-C4-alkyl)2, -N-(C1-C4)-alkyl-(C1-C4-hydroxyalkyl)- -N-(C1-C4-hydroxyalkyl)2 or -NH-aryl, for example, anilino-, anilinemono- or disulfonic acid or aniline sulfone amide, morpholino-, -S-(C1-C4)-alkyl(aryl) or radical of amino acid, for example, aspartic acid or iminoacetic acid that is replaced with radical in amino-group; M means hydrogen, sodium, potassium, calcium, magnesium atom or ammonium, mono-, di-, tri- or tetra-(C1-C4)-alkylammonium, mono-, di- or tri-(C1-C4)-hydroxyalkylammonium, or ammonium di- or tri-substituted with a mixture of (C1-C4)-alkyl and (C1-C4)-hydroxyalkyl groups. Covers prepared on coating paper elicit high photostability and enhanced whiteness degree.

EFFECT: improved method for preparing, improved properties of covers.

7 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to solutions of optical bleaching agents which are stable during storage, based on defined salt forms of aniline-substituted bis-triazinyl derivatives of 4,4'-diaminostilbene-2,2'-disulphonic acid of formula where R denotes a hydrogen atom, R1 denotes a β-hydroxyalkyl radical having 2-4 carbon atoms, R2 denotes a hydrogen atom, M+ denotes Na+, n is less than or equal to 1.5; which do not require additional dissolution promoting additives.

EFFECT: high stability of the compounds during storage.

14 cl, 2 tbl, 6 ex

Up!