Combination of optical bleaching agents

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

 

The present invention relates to aqueous compositions comprising essentially at least one water-soluble optical Brightener, a polymer obtained from ethyleneamines monomer, and optionally polyethylene glycol, which can be used for optical bleaching of paper in the coating when applied in the size press or film press.

Known application of pigment compositions for coating the surface of the molded paper or paperboard to improve certain properties, such as printability, gloss and optical characteristics, for example white. These pigment compositions for coating known as coating pigments. Composition for coating typically is applied to the paper surface in the form of an aqueous dispersion comprising a mixture of pigments with the binder.

Typically, the coating composition of the pigment includes one or more pigments, optical brighteners (CBOs), binders, rheology modifiers, and optionally other excipients, such as preservatives, regulating pH additives and lubricants.

Optical brighteners acceptable to such compositions for coating, are usually anionic, and when they are applied on the surface of Bumagin combination with other components such coating pigments, just a bleaching capacity is often not implemented.

It has long been known that the use of polyvinyl alcohol as a so-called promoters or activators for CBOs creates problems arising in relation to the rheological properties containing coating pigments.

One attempt to solve the problem described in the application EP 145267 A2, which refers to the composition, including CBOs and an activating amount of a polymer comprising a copolymer of hydroxyethylmethacrylate.

However, despite the fact that there are no problems in relation to the rheological properties of coating materials does not occur, the maximum value of the degree of whiteness that can be achieved with the use of this composition are significantly below those that can be achieved by adding polyvinyl alcohols.

In the US 4717502 described composition, comprising as CBOs special aniline derivatives of 4,4'-bistriazinylpyridine-2,2'-disulfonic acid together with glycols of molecular weight from 1000 to 3000, which can be used for coating paper and achieve a high degree of whiteness. However, to confirm this statement any values not listed.

There is therefore a need for activators or promoters for use in materials glamourmodel layer, containing CBOs, the results of which are the maximum whiteness while maintaining the required rheological properties.

In WO 01/07714 A1 describes some acrylamide copolymers with average molecular weights from 50,000 to 500,000, which can be used as rheology modifiers in aqueous dispersions of coating pigments.

However, no special improvement degree of whiteness is not noted, and the preferred average molecular weight of the polymers is 200,000.

It was found that the addition of some acrylamide Homo - and copolymers of relatively low average molecular masses in the coating pigment causes not only extremely high values of the degree of whiteness of the coated paper, surpassing those that can be achieved by using polietilenglikolya promoters, but during the coating process does not note any problems in relation to the rheological properties.

Accordingly, an object of the present invention is a composition comprising

a) at least one water-soluble optical Brightener,

b) a polymer obtained from ethyleneamines monomer or monomer mixture, characterized in that at least one monomer is an acrylamide, and a polymerase which has an average (srednevekovoi) molecular weight ranging from 500 to 49000, optional,

C) polyethylene glycol with srednevekovoi molecular weight in the range from 500 to 6000 and

g) water.

In a preferred embodiment, optical brighteners are those that are typically used for bleaching cellulose fibers and are selected from such compounds as derivatives of 4,4'-bistriazinylpyridine-2,2'-disulfonic acid formula

,

in which

R1, R2, R3and R4each independently represents-NH2, -OS1-C4alkyl, -Oeil, -NHC1-C4alkyl, -N(C1-C4alkyl)2, -N(C1-C4alkyl)(C2-C4hydroxyalkyl), -NHC2-C4hydroxyalkyl, -N(C2-C4hydroxyalkyl)2or NH, which aryl represents phenyl which can be unsubstituted or substituted by one or two sulfoxylate groups, -COOH, -SOOS1-C4by alkyl, -CONH2, -CONHC1-C4the alkyl, or-CON(C1-C4alkyl)2, morpholinyl, piperidinyl or pyrolidine residue-SC1-C4alkyl or aryl, or a residue of the amino acid or amide amino acids at the amino group which removed a hydrogen atom, and

M denotes a hydrogen atom, an alkaline or alkaline-earth metal, ammonium, or ammonium that is mono-, di-, and three and tetraselmis C 1-C4the alkyl or C2-C4hydroxyalkyl, and distributionally derivatives of the formula

,

in which

R5denotes a hydrogen atom or a chlorine or1-C4alkoxy, and M has the above meaning, and mixtures thereof.

Of the compounds of formula (1) is most appropriate for use as component (a) of the composition are bis-creatinineclearance acid, in which R1and R3are the same and R2and R4are the same, and each independently represents

-NH2, -NHC1-C4alkyl, -N(C1-C4alkyl)2, -N(C1-C4alkyl)(C2-C4hydroxyalkyl), -N(C2-C4hydroxyalkyl)2, -NH, which aryl represents unsubstituted phenyl or phenyl which is substituted by one or two groups-So3M, moholynagy the remainder or residue of the amino acid or amide, amino groups which are removed hydrogen atom. The preferred balance of amino acids or amide amino acids, from which is removed a hydrogen atom, represents the one that derivative from glycine, alanine, serine, cysteine, phenylalanine, tyrosine (4-hydroxyphenylglycine), diiodotyrosine, tryptophan (β-indoleamine), histidine (β-imidazolylidene), α-aminona what Laney acid, methionine, valine (α-aminosalicilovoj acid), Norvaline, leucine (α-aminoisoquinoline acid), isoleucine (α-amino-β-methylvalerate acid), norleucine (α-amino-n-Caproic acid), arginine, ornithine (α,δ-diaminopurine acid), lysine (α,ε-diaminopropionic acid), aspartic acid (amino amber acid), glutamic acid (α-aminoglutaric acid), threonine, hydroxylamino acid and taurine, as well as their mixtures and optical isomers, and particularly preferred glycine and aspartic acid.

Additional preferred example amino acids, which can be derivatization amino acid residue is iminodiethanol acid or its mono - or diamide, while acceptable amide of amino acids is a 2-hydroxyethylaminophenol.

Preferred distributionally optical brighteners as component (a) compositions are those selected from compounds of the formula

,

,

and

,

in which

M' denotes hydrogen, lithium, potassium or sodium, resulting in the most preferred are derivatives of 2,2'-disulfonic acid of the formula (3).

In the volume defined is Eleni substituents in the compounds of formulas (1) and (2) C 1-C4alkyl radicals are branched or non-branched and are, for example, methyl, ethyl, propyl, isopropyl or n-, echoed tert-butyl; they can be unsubstituted or substituted by a halogen atom such as fluorine atom, chlorine or bromine. With1-C4alkoxy is, for example, methoxy, ethoxy, propoxy, isopropoxy or n-butoxy, whereas With1-C4hydroxyalkyl represents, for example, hydroxyethyl, hydroxypropyl or hydroxybutyl.

These optical brighteners are known compounds or can be obtained by known methods.

In one preferred embodiment, the polymer component b) of a composition is a homopolymer comprising the repeating unit, which derivateservlet only from acrylamide.

However, in another preferred embodiment, the polymer component b) of the composition may be a polymer comprising recurring units which derivateservlet, in addition to acrylamide, monomers selected from the group including methacrylamide, hydroxyethylacrylate, such as hydroxymethyl and hydroxyethylacrylate, hydroxyethylmethacrylate, such as hydroxymethyl and hydroxyethylmethacrylate, N-alkylacrylate, such as N-methyl - and N-ethylacetamide, N-alkylmethacrylamide is, such as N-methyl - and N-athletically, N-hydroxyethylacrylate, N,N-dialkylacrylamide, such as N,N-diethyl-, and mainly N,N-dimethylacrylamide, N,N-dialkylacrylamide, such as N,N-dimethyl - and N,N-diethylacrylamide, N,N-di(hydroxyalkyl)acrylamide, such as N,N-di(2-hydroxyethyl)acrylamide, mortonagrion, in particular acrylic acid and methacrylic acid, taconova acid, crotonic acid, 2-acrylamide-2-methylpropanesulfonic acid, arylsulfonate acid and vinylsulfonic acid, resulting in acid monomers are in the form of their free acid or water soluble salts, such as their salts are alkali metal (e.g. lithium, potassium or sodium and ammonium.

In a preferred embodiment, srednevekovye molecular weight polymers are in the range from 500 to 40,000, and the interval from 1000 to 25000 is the most preferred.

Polymers that can be used for the composition according to the invention are known polymeric materials or can be obtained by known polymerization methods.

The ratio of the various components of the composition can be varied in a very wide intervals. For example, the ratio of water-soluble optical Brightener, component a)to the polymer, component (b)can be varied from 1 to 0.1 and 1 to 5 parts by weight, but preferably in the m version it is in the range from 1 to 0.2 to 1 to 4 parts by weight, but mainly from 1 to 0.5 to 1 to 3 parts by weight, and the composition includes at least 20 wt.% water.

In some cases it may be appropriate to Supplement the composition of the glycols srednevekovyh molecular mass ranging from 500 to 6000. However, the glycols having srednevekovye molecular mass of from 1000 to 6000, are the most acceptable, with the most preferred polyethylene glycol 1500.

When are the glycols, they are used in the same quantities as for the above-mentioned polymers. In other words, the ratio of water-soluble optical Brightener, component (a), polyethylene glycol, component b)can be varied from 1 to 0.1 and 1 to 5 parts by weight, but in the preferred embodiment, it ranges from 1 to 0.2 to 1 to 4 parts by weight, and mostly from 1 to 0.5 to 1 to 3 parts by weight of

Optical bleaching compositions according to the invention is prepared by mechanical mixing of components a), b) optional C) and d) and mixing until until the mixture becomes homogeneous.

A number of compositions for use in accordance with the invention, used in compositions for coating paper, depends on the target whitening effect, but usually corresponds to the number containing from 0.01 to 5 wt.% optical bleach.

Compositions for applying to p the floor on paper are usually characterized by a dry matter content of from 35 to 80 wt.%, preferably from 40 to 70 wt.%. In addition to the bleaching compositions according to the invention in quantities of from 0.01 to 10 parts by weight, per 100 hours of inorganic pigment they typically include

(I) from 3 to 25 parts by weight of a binder, and a shared binders,

(II) from 0 to 1 parts by weight of rheology modifier,

(III) from 0 to 2 parts by weight of an agent for imparting water resistance and

(IV) 0 to 5 parts by weight of an optical Brightener and/or dye to impart color and/or other auxiliary substances.

Bleaching compositions according to the invention are excellently suitable for bleaching optional colored compositions for coating commonly used in the textile industry, production of paints, adhesives, plastics, wood and paper industry. Such compositions for coating as binders (shared binders include dispersions of plastics on the basis of copolymers of butadiene and styrene, naphthalenesulfonic acids and formaldehyde, polyethylene and polypropyleneoxide, Acrylonitrile, butadiene and styrene, esters of acrylic acid, ethylene-vinyl chloride and ethylene-vinyl acetate, or homopolymers, such as polyvinyl chloride, grades, polyethylene, polyvinyl acetate, polyvinyl alcohol is polyurethane.

If necessary, the composition for coating may, in addition to the bleaching compositions can contain other optical brighteners and/or giving shade dyes or pigments.

For dyeing compositions for coating with pigment usually use silicates, such as China clay and kaolin and barium sulfate, a white pigment, titanium dioxide and calcium compounds. They are described, for example, in the work J.P.Casey "Pulp and Paper; Chemistry and Chemical Technology", 2nd edition, volume III, cc.1684-1649, Mc Graw-Hill "Pulp and Paper Manufacture", 2nd edition, volume II, s and in EP-A-0003568.

Bleaching compositions in accordance with the invention can be used mainly for coating paper, more preferably in the inkjet paper and photo paper, wood, thin films, textiles, nonwovens and acceptable building materials. Particular preference is given to the application on paper and thick paper, photo paper and inkjet paper.

Therefore, another object of the invention is paper, which is treated with a composition for coating as described above, the composition according to the invention or liquid composition for size press or film press as set forth below.

This composition may be applied to odlokw in the form of a coating using the equipment for any type of coating, such as machine doctor type, roller coating machine, etc.

In addition to the coating composition according to the invention can be applied to the paper surface in the form of an aqueous liquid using a size press or film press.

Thus, another object of the invention is a liquid composition for size press or film press, which is used for optical bleaching of paper, including

a) from 0.001 to 2 wt.%, preferably from 0.1 to 1 wt.%, optical bleaching compositions according to the invention;

b) from 1 to 20 wt.%, preferably from 2 to 15 wt.%, and most preferably from 7 to 12 wt.%, one or more binders, such as anionic starch;

C) from 0 to 10 wt.% pigment and/or further auxiliary substances and water to 100%.

Composition for coating or liquid composition for size press or film press as an additional excipients may include binding agents, agents for improving the rheological and printing properties, fixing agents, agents for imparting water resistance, defoamers and/or biocides. Examples of binders are polyvinyl alcohols, polyvinyl acetate, copolymers of acrylic ester/styrene copolymers carboxylating styrene/butadiene, watering solerrain, oxidized starch, carboxymethyl cellulose and other water soluble derivatives of cellulose, whereas, in particular, polyacrylamides and their copolymers can be used to improve the rheological and printing properties.

The coating materials prepared in this way have, in addition to a high degree of siteprotect, excellent degree of whiteness.

The invention is illustrated by the following examples without intention to give them restrictive; in all cases, unless otherwise stated, parts and percentages are mass.

A. Obtaining polymers

General method

Charged to the reactor a mixture of 100 g of water and 0.5 ml of 6%aqueous solution of the product Tetralon® and the mixture is stirred and heated to 95°C, when then add the specified amount of ammonium persulfate (see table 1). In this mixture for 2 h 15 min continuously add 600 g of a 50%aqueous solution of acrylamide in 300 g of water and at the same time in the reactor for 3 h continuously add solutions specified number of ammonium persulfate (see table 1) in 50 ml of water and a specified number of hypophosphite sodium (see table 1) in 40 ml of water. After the addition, the reaction mixture is stirred for further 30 min at 95°C, cooled to 65°C. and treated with a solution of 2 g of sodium metabisulfite in 20 g of water. Stirring is continued in those who tell the subsequent 1 h at 65°C and cooled, resulting in getting an aqueous solution containing a specified percentage (see table 1) of the corresponding polymer.

The quantities of reagents used and srednevekovye molecular weight corresponding to the obtained polymers are summarized in the following table 1.

Table 1
Polymer No.All of ammonium persulfateHypophosphite sodiumDry weight of the polymerThe average molecular weight
P 1016 g6 g33,7%1590
P 1023 g6 g33,6%5540
P 1033 g3 g33,1%14300

The process as above, but with replacement of the acrylamide or mixtures of acrylamide and acrylic acid or acrylamide and dimethylacrylamide (DMCM), copolymers shown in the following table 2, were obtained using the m those numbers regulator polymerization degree (hypophosphite sodium) and related initiatives, listed in the table.

P 120
Table 2
Polymer No.Acrylamide, %Comonomer, %Initiator1, %Hypophosphite sodium, %Dry weightAverage MW
P 104955 acrylic acid1,0 DOG1,533,2%20400
P 105955 acrylic acid2.5 PSA2,532,5%6300
P 1069010 acrylic acid1,0 DOG1,032,9%21200
P 1079010 acrylic acid2.0 DOG2,533,4%6850
P 1087525 acrylic acid1,0 DOG1,031,8%is 21,900
P 1097525 acrylic acid2.0 DOG2,032,5%7320
P 1105050 acrylic acid2.0 DOG2,033,5%19900
P 1115050 acrylic acid2.5 PSA3,034,3%1360
P 1122575 acrylic acid1.5 DOG2,031,9%19800
P 1132575 acrylic acid2.5 PSA2,5 33,5%11600
P 114955 DMACM1,0 V502,035,3%23800
P 115955 DMACM2,0 V502,534,3%5760
P 1169010 DMACM1,0 V502,034,5%15900
P 1179010 DMACM2,0 V502,034,1%6250
P 1187525 DMACM1,0 V501,035,2%18000
P 1197525 DMACM2,0 V502,532,1%2980
5050 DMACM1,0 V501,537,5%21100
P 1215050 DMACM2,0 V502,537,9%8250
P 1222575 DMACM1,0 V501,543,3%17000
P 1232575 DMACM2,0 V501,540,3%4250

Note:1the polymerization initiators are either ammonium persulfate (PSA)or the product V50, which is a technical product that is available on the company Wako Chemicals, chemical name is 2,2-azodiisobutyronitrile, CAS Registration No. 2997-92-4.

B. Optical brighteners

Structural formulas used specific CBOs General the th formula (1A) shown in the following table 3:

Table 3
CBOs No.R1R2
FW201-N(CH2CH2OH)2
FW202-N(CH2CH20H)2
FW203
FW204-N(CH2CH3)2
FW205-NHCH2CH2OH-NHCH2CH2OH

C. coating

Prepare aqueous coating pigment, having a solids content of 64%, including 70 frequent. calcium carbonate and 30 frequent. clay as an inorganic pigment, 9 frequent. latex binders of the BSC 0.25 to frequent. the viscosity modifier for acrylic based and 0.2 hours polyvinyl alcohol, and adding 0,17 frequent. 4h. water rest the RA sodium hydroxide pH adjusted to 8.5. In this coating pigment type of solution composition according to the invention, comprising 0,4 frequent. the corresponding optical Brightener and 0.8 frequent. appropriate polymer (both quantities are expressed in mass units, calculated on the total weight of inorganic pigment).

The final coating the pigment with the use of the rod of the machine for applying the coating to be applied on the neutral glued, free of CBOs base paper having a weight of 85 g/m2achieving the ultimate in coating weight of 10 g/m2and the paper is dried and condition. Next, using a spectrophotometer Datacolor Elrepho 3000 determine the degree of whiteness (Wcie) and ISO-fluorescence (Fisoready sheets. The results are summarized in the following table 4:

Table 4
Example No.PolymerSpasWcieFiso
NoNo74,30,0
NoFW 201 96,57,4
1P 101FW 20198,08,0
2P 102FW 20197,67,8
3P 103FW 20198,38,1
NoFW 20292,26,3
4P 101FW 20297,68,2
5P 102FW 20297,68,2
6P 103FW 202of 97.88,3
NoFW 203 92,46,1
7P 101FW 203101,810,4
8P 102FW 203103,410,9
9P 103FW 203101,710,4
NoFW 20498,47,8
10P 101FW 204103,69,6
11P 102FW 204102,49,2
12P 103FW 204to 102.39,2
NoFW 205 94,36,8
Example No.PolymerSpasWcieFiso
13P 101FW 20595,77,3
14P 102FW 20596,27,5
15P 103FW 20596,07,5

The results in table 4 clearly demonstrate the increase in whiteness and fluorescence by adding the composition according to the invention.

During the subsequent series of experiments coating pigments were prepared as described above, but they also contained a polyethylene glycol (PEG) in accordance with another embodiment of the composition according to the invention.

The results are summarized in the following table 5:

Table 5
Example No.Track WcieFiso
Without CBOs, polymer and PEG74,20,0
0,4 frequent. FW 20495,87,0
160,4 frequent. FW 204+1.0 part of PEG 1500103,19,0
170,4 frequent. FW 204+1.0 part of P 102104,79,8
180,4 frequent. FW 204+0,5 frequent. P 102+0,5 frequent. PEG 1500105,2the 9.7

The above results not only demonstrate excellent reinforcing effect of the composition according to the invention, but also demonstrate a synergistic effect of the combination of polymer together with polyethylene glycol.

During another series of experiments, the coating materials were prepared as described above, the average coating weight was 13.7 g/m2they contained composition in accordance with the invention with 0.4 and 0.8 parts by weight of active substance (based on the total weight of inorganic pigment) FW 204 and copolymers, presented the in table 2, with respect to 1 parts by weight of CBOs to the 2.3 parts by weight of the copolymer.

The results are summarized in the following table 6:

31 40 49 58
Table 6
Example No.The copolymerParts FW 204WcieFiso
NoNo74,91,5
No0,499,49,8
No0,8for 95.29,2
19P 1040,4103,511,1
20P 1040,8110,213,9
21P 1050,4103,311,1
22P 1050,8110,814,1
23P 1060,4102,510,8
24P 1060,8109,813,7
25P 1070,4102,910,9
26P 1070,8110,914,2
27P 1080,4102,210,6
28P 1080,8107,412,9
29P 1090,4102,210,6
30P 1090,8107,612,9
P 1100,4101,610,4
32P 1100,8103,3the 11.6
33P 1110,4101,410,4
34P 1110,8104,0to 12.0
35P 1120,4100,310,0
36P 1120,8101,310,9
37P 1130,4100,010,0
38P 1130,8101,711.1
39P 1140,4to 103.811,3
P 1140,8111,814,5
41P 1150,4103,711,3
42P 1150,8111,614.4V
43P 1160,4104,111,4
44P 1160,8to 112.214,6
45P 1170,4104,111,3
46P 1170,8to 112.414,6
47P 1180,4104,111,3
48P 1180,8to 112.414,5
P 1190,4104,411,5
50P 1190,8112,614,6
51P 1200,4104,511,5
52P 1200,8to 113.414,8
53P 1210,4105,0the 11.6
54P 1210,8113,614,9
55P 1220,4104,811,5
56P 1220,8113,514,7
57P 1230,4to 105.311,7
P 1230,8114,315,0

The above results not only demonstrate excellent reinforcing effect of the copolymers, but also show, in contrast to the use of only one FW 204 that increasing the concentration of CBOs also leads to high degree of whiteness because of the lowered tendency to darkening at higher concentrations is a much more valuable property for the manufacture of paper products is extremely high degrees of whiteness.

G. Application in sizing press

To 100 g of an aqueous solution containing 8.0 g of anionic starch, added to the composition according to the invention containing 0.3 g of the corresponding optical bleach (CBOs) and 0.3 g of the corresponding polymer.

This solution using a size press applied to the tree and free from CBOs base paper having a weight of 80 g/m2, resulting in the filling of the paper web is 24%.

After drying and conditioning using Datacolor spectrophotometer Eirepho 3000 determine the degree of whiteness, Wcieand ISO-fluorescence, Fisoready sheets.

The results are summarized in the following table 7:

Table 7
Example No.PolymerSpasWcieFiso
NoNo68,10,0
NoFW 201108,3the 13.4
59P 101FW 201107,613,2
60P 102FW 201to 108.2the 13.4
61P 103FW 201108,513,7
NoFW 202109,413,7
62P 101FW 202109,513,7
63P 102 FW 202109,013,6
64P 103FW 202110,314,0
NoFW 204113,314,2
65P 101FW 204114,314,6
66P 102FW 204114,314,6
67P 103FW 204or 115.114,9
NoFW 205113,515,7
68P 101FW 205115,016,1
69P 102FW 205or 115.116,2
70 P 103FW 205113,815,8

In most cases, again clearly demonstrated the reinforcing effect of the composition according to the invention.

1. Water-soluble optical Brightener composition, including
a) at least one water-soluble optical Brightener,
b) a polymer obtained from ethyleneamines monomer or monomer mixture, characterized in that at least one monomer is an acrylamide and a water-soluble polymer has an average (srednevekovoi) molecular weight ranging from 500 to 49000, optional
C) polyethylene glycol with srednevekovoi molecular weight in the range from 500 to 6000 and
g) water.

2. The composition according to claim 1, in which the optical Brightener selected from the compounds of formula

in which R1, R2, R3and R4each independently represents-NH2, -OC1-C4alkyl, -Oeil, -NHC1-C4alkyl, -N(C1-C4alkyl)2, -N(C1-C4alkyl)(C1-C4hydroxyalkyl), -NHC1-C4hydroxyalkyl, -N(C1-C4hydroxyalkyl)2or NH, which aryl represents phenyl which can be unsubstituted or substituted one Il the two sulfoxylate groups, -COOH, -SOOS1-C4by alkyl, -CONH2, -CONHC1-C4Kilom or-CON(C1-C4alkyl)2, morpholinyl, piperidinyl or pyrolidine residue-SC1-C4alkyl or aryl, or a residue of the amino acid or amide amino acids, amino groups which are removed hydrogen atom, and M denotes a hydrogen atom, an alkaline or alkaline-earth metal, ammonium, or ammonium that is mono-, di-, tri - or tetraparesis1-C4the alkyl or C2-C4hydroxyalkyl, and of the compounds of formula

in which R5denotes a hydrogen atom or a chlorine or1-C4alkoxy, and M has the above meaning, and mixtures thereof.

3. The composition according to claim 1 or 2, in which the polymer includes repeating units, which derivateservlet of acrylamide.

4. The composition according to claim 1 or 2, in which the polymer includes repeating units which, in addition to acrylamide, derivateservlet from monomers selected from the group including methacrylamide, hydroxyethylacrylate, hydroxyethylmethacrylate, N-alkylacrylate, N-alkylmethacrylamide, N-hydroxyethylamide, N,N-dialkylacrylamide, N,N-dialkylacrylamide, N,N-di(hydroxyalkyl)acrylamide, mortonagrion, acrylic acid, methacrylic acid, taconova acid, crotonic acid, 2-acrylamide-2-meth is propanesulfonic acid, arylsulfonate acid and vinylsulfonic acid, resulting in acid monomers are in the form of their free acid or water soluble salts.

5. The composition according to claim 1, in which the ratio of water-soluble optical Brightener, component (a), the polymer component b)is from 1 to 0.1 and 1 to 5 parts by weight, and the composition includes at least 20 wt.% water.

6. The use of water-soluble optical Brightener composition according to claim 1 for optical bleaching of paper.

7. The paper, which is treated with a composition according to claim 1.



 

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17 cl, 33 tbl

FIELD: textile, paper.

SUBSTANCE: procedure refers to production of wood pulp and can be implemented in pulp-and-paper industry. The procedure consists in whitening fibres of sulphate pulp with a whitening agent on base of chlorine and in washing whitened fibres of sulphate pulp. Upon washing fibres of sulphate pulp are subject to interaction with at least one optic whitener before mixing ponds. Interacting is carried out in solution at pH from 3.5 to 8.0 and temperature from 60 to 80°C during 0.5-6 hours. The invention also refers to wood pulp produced by the said procedure.

EFFECT: increased whiteness and optic brightness of paper at decreased utilisation of optic whitener.

22 cl, 11 dwg, 11 tbl, 7 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: textile, paper.

SUBSTANCE: method consists in addition of aqueous solution of binding agent, having concentration from 0.03 to 0.4 wt %, into suspension of cellulose material; and addition of mixed suspension of cellulose into header, and suspension contains suspension of cellulose material and aqueous solution of binding agent. Besides, addition of aqueous solution of binding agent is done between discharge box and meshy filter arranged in close proximity to discharge box. Installation comprises the following components: meshy filter to remove admixtures from suspension of cellulose material and device to add binding agent to supply aqueous solution of binding agent, having concentration from 0.03 to 0.4%, into pipe, which connects meshy filter and discharge box.

EFFECT: invention provides for the possibility to make well-formed paper even when using high-speed paper-making machines.

4 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: aqueous dispersion contains A) 0.05-10 wt % salts of perfluoropolyester derivatives of dicarboxylic acids of formula T-O-Rt-T, where T = -CF2-COOZ or -CF2CF2-COOZ, Z - Na, K, NH4, R1(R2)(R3)N, R1=R2=alkyl or hydroxyalkyl, R3 = H, alkyl or hydroxyalkyl, Rf denotes (per)fluoropolyoxyalkylene chain with number-average molecular weight of 500-10000, and B) 0.01-5 wt % water-dispersible or water-soluble cationogenic polymers with charge density in dry polymer greater than 1 mEq/g. The dispersion is obtained by dispersing 0.05-10 wt % component (A) in water. Cationogenic polymer (B) is slowly added to the obtained dispersion while stirring until achieving weight ratio of (A) to (B) of 1:1-5:1.

EFFECT: dispersions which endow paper with improved oil-repellent properties against compounds with high content of fat or fatty acids.

14 cl, 16 tbl, 17 ex

Dispersion // 2309213

FIELD: paper-and-pulp industry.

SUBSTANCE: invention provides aqueous dispersion, method of preparing it, use of dispersion, and a paper manufacturing process comprising internal sizing and surface sizing of paper. Aqueous dispersion contains at least one cellulose-reactive sizing agent selected from group consisting of ketene dimers and multimers, at least one cellulose-unreactive sizing agent, and at least one emulsifier selected from group consisting of oxyalkylene phosphate and sulfate esters and their salts. Dispersion preparation method comprises joining together sizing agents with at least one emulsifier in presence of water to form mixture, which is then homogenized to form aqueous dispersion. Paper manufacturing process comprises forming paper sheet from pulp containing cellulose fibers and depositing said aqueous dispersion thereon. Paper manufacturing process also comprises adding said aqueous dispersion to pulp containing cellulose fibers and dehydrating pulp on screen to produce paper.

EFFECT: increased stability of dispersion and efficiency of outside and internal sizing.

18 cl, 4 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to cation-active or amphoteric polymers used as additives in paper production to improve efficiency of gluing paper products, methods of production and use of additives.

EFFECT: more efficient gluing of paper products, saving material for gluing.

28 cl, 10 tbl, 11 ex

FIELD: paper industry.

SUBSTANCE: methods refer to manufacturing of bleached cellulose material, prevention of yellowing and loss of whiteness in bleached craft-cellulose, and manufacturing of paper goods. In process of bleached cellulose material manufacturing, bleached craft-cellulose is produced and exposed to contact with sufficient amount of more or several reducing agents. Additionally bleached craft-cellulose is exposed to contact with one or several optical bleach, with one or more chelating agent. Method for prevention of yellowing and loss of whiteness of bleached craft-cellulose in storage includes addition of efficient amount of one or more reducing agent into bleached cellulose and possibly one or more chelating agent, one or more polycarboxylate or their combinations. Method for production of paper goods includes production of bleached craft-cellulose, formation of initial water suspension from it, water drainage with formation of sheet and sheet drying. Besides efficient amount of one or more reducing agent is added into bleached craft-cellulose, initial suspension or sheet. Additionally one or more chelating agent is added there, one or more optical bleach, one or more polycarboxylate, or their combination.

EFFECT: improved quality of paper goods, increased stabilisation of whiteness and increased resistance to yellowing in process of paper production and to thermal yellowing, improved colour pattern.

17 cl, 33 tbl

FIELD: textile; paper.

SUBSTANCE: method consists of adding to the paper sheets approximately 0.05 pounds/ton to 15 pounds/ton, in accordance with the dry fibers, one or several polymers, functioning as aldehyde, containing amino or amido group, where, at least, 15 molar percent amino or amido group function with one or several aldehydes and where the functionaling aldehyde polymers have a molecular weight of not less than approximately 100000.

EFFECT: increased activity for drying due to a reduction in the amount of polymer.

14 cl, 5 ex

FIELD: papermaking.

SUBSTANCE: pre-impregnate is manufactured by impregnation of crude paper with thermosetting formaldehyde-free resin until content thereof 10 to 70%. Residual moisture content in pre-impregnate is 2-3%. Resin contains: at least one radical-polymerization polymer with less than 5% of α,β-ethylenically unsaturated mono- or dicarboxylic acid; at least one radical-polymerization polymer containing more than 5% of α,β-ethylenically unsaturated mono- or dicarboxylic acid; and at least one alkanolamine with at least two hydroxyl groups; or resin contains at least one radical-polymerization polymer with 5-100%, particularly 5-50%, or more particularly 10-40% of α,β-ethylenically unsaturated mono- or dicarboxylic acid and at least one above alkanolamine.

EFFECT: improved quality of surface, printing properties, delamination resistance, and varnishing capacity.

16 cl, 3 dwg, 2 tbl, 2 ex

The invention relates to the manufacture of paper for corrugation and/or planar layers in the manufacture of corrugated cardboard
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