Optical bleaching agent solutions stable during storage

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

 

The present invention relates to stable storage solutions of optical brighteners based on derivatives of diaminostilbene that do not require further contributing to the dissolution of the additives.

It is well known that white and, thus, the attractiveness of paper, cardboard, textiles and non-woven products can be improved by adding a reagent for optical bleaching (OBA). The most important optical brighteners in the paper and cardboard industry are of aniline-substituted restrictively derivatives of 4,4'-diaminostilbene-2,2'-disulfonic acid. Aniline Deputy may contain additional groups, sulfonic acid, which provide greater solubility. Optical brighteners, in which aniline Deputy does not contain sulfonic acid groups, are of a particularly high affinity for cellulosic fibres and are particularly suitable for use in wet stage of the paper production process. For ease of handling and measurement, paper and cardboard industry require that optical brighteners were provided in liquid form, preferably in the form of a concentrated aqueous solution. In addition, the liquid form must be stable to prolonged storage in a wide temperature range of the zone, typically from 4 to 50°C. In the past, contributing to the dissolution of auxiliary substances, such as urea or ethylene glycol, was added in amounts up to 30 wt.% in order to ensure stability during storage. However, these contributing to the dissolution of the reagents have no affinity for cellulose and pollute the waste water of a paper mill. Thus, there is a demand for anilinopiperidine restrictively derivatives of 4,4'-diaminostilbene-2,2'-disulfonic acid that can form a stable concentrated aqueous solutions without adding contributing to the dissolution of auxiliary substances.

GB 1243276 says restrictively derivatives of 4,4'-diaminostilbene-2,2'-disulfonic acids which contain at least one, preferably two, propionamide radical, and their use as reagents for optical bleaching of paper. First described the preparation and use of compounds of formula (A)

The compound was isolated as a solid and dissolved in water at a concentration of 0.1% before applying to the aqueous suspension of cellulose fibers.

The compound (A) is also described in GB 1247765.

Compound (A) is also a preferred component of the liquid Laundry detergent composition according to EP 376893 A2. The authors of the patent claim ")the ski brighteners according to the invention are applied in powder form or in the form of solutions in water. Such solutions have a content of from 18 to 75 wt.% the active substance, and preferably also contain hydrotropism substances".

In GB 1243276, GB 1247765 or EP 376893 A2 do not indicate any advantage when applying a different counterion than sodium.

WO 02/055646 tries to solve the problem of the formation of stable, concentrated aqueous solution Desulfovibrio optical Brightener by providing a mixture of two or more bis(creatininemia)stilbenoid derivatives. Example 1 describes obtaining a stable aqueous solution containing 0,2844 mol/kg optical Brightener in the form of an equimolar mixture of the compounds (B) and (C), each in the form of a mixed sodium/triethanolammonium salt.

However, the storage stability is also dependent on the presence of the additives indicated in WO 02/055646 on p.10 (F1), which is used preferably at a concentration of from 0.2 to 3 wt.% solution. Preferred additives (F1represent tertiary alkanolamine; triisopropanolamine is especially preferred.

WO 2005/028749 Al first described the optical Brightener composition comprising alkanolamine and derived bis(creatininemia)stilbene. Preferred alkanolamine are the Wallpapers of 2-amino-2-methyl-1-propanol, 1-amino-2-propanol or a mixture of 2-amino-2-methyl-1-propanol and 2-(N-methylamino)-2-methyl-1-propanol.

Japanese application 62-273266 declares the optical Brightener composition comprising the Quaternary ammonium salts of anionic derivatives of bis(creatininemia)stilbene. Preferred Quaternary ammonium ion is a trimethyl-β-hydroxyethylammonium ion.

EP-A-884312 first describes hydrates derived bis(creatininemia)stilbene of the formula (D)

in which M and M1independently represent a hydrogen atom, alkaline earth metal or ammonium. Hydrates, as stated, is capable of stabilizing the resulting liquid suspension low quantities of the formulation excipients.

The paper manufacturers, however, prefer the use of optical brighteners in the dissolved form, for example, for ease of handling and measurement. Thus, there remains a need to provide a stable, concentrated aqueous solutions desulfonatronum optical brighteners, which are free from contributing to the dissolution of auxiliary substances.

Now unexpectedly found that the specific salt form of aniline-substituted mistraining derivatives of 4,4'-diaminostilbene-2,2'-disulfonic acid makes the prob is mportant stability of the resulting concentrated solutions, without adding contributing to the dissolution of auxiliary substances.

The present invention thus represents a compound of formula (1)

in which R represents a hydrogen atom or a methyl radical,

R1represents a hydrogen atom, alkyl radical having 1-4 carbon atoms, β-hydroxyalkyl radical having 2-4 carbon atoms, β-alkoxyalkyl radical having 3 or 4 carbon atoms, or CH2CH2CONH2.

R2represents a hydrogen atom or a methyl radical,

M+is a Li+, Na+or K+and

n is less than or equal to 1.5.

Preferred are compounds in which

R represents a hydrogen atom or a methyl radical,

R1represents a hydrogen atom, a methyl radical, a β-hydroxyalkyl radical having 2 or 3 carbon atoms,

R2represents a hydrogen atom or a methyl radical,

M+represents Na+and

n is less than or equal to 1.5.

More preferred are compounds, in which the

R represents a hydrogen atom,

R1represents a hydrogen atom, a methyl radical or a β-hydroxyalkyl radical having 2 carbon atoms,

R2represents a hydrogen atom,

M +represents Na+and

n is less than or equal to 1.5.

Especially preferred are compounds in which

R represents a hydrogen atom,

R1represents-CH2CH2OH,

R2represents a hydrogen atom,

M+represents Na+and

n is less than or equal to 1.2.

The present invention also provides a method of obtaining the above-mentioned compounds, characterized by the fact that the compound of the formula (2)

in the form of an aqueous solution is converted into a mixed salt form (1), in which at least 25% M+ions associated with the sulphonate groups, substituted in (CH3)2NH+CH2CH2OH-ions, or by treating 2-dimethylaminoethanol and mineral acid (such as HCl or H2SO4), or by sequential cation exchange resin and 2-dimethylaminoethanol. The compound of formula (1) is then optional stands out and can be further separated from excess salts and alkanolamine membrane filtration.

The preferred method of membrane filtration is ultrafiltration using, for example, polysulfone, polyvinylidene fluoride, cellulose acetate or thin-film membranes.

Further, the invention provides a water dissolve the one or more compounds of formula (1), which may optionally contain one or more carriers, antifreeze agents, defoamers, agents that promote dissolution, preservatives, complexing agents, etc. and organic by-products formed during the preparation of optical bleach.

The media, as you know, is reported improved performance whitening painted cover songs of bleach and may constitute, for example, polyethylene glycols, polyvinyl alcohol or carboxymethyl cellulose.

Antifreeze can represent, for example, urea, diethylene glycol or triethylene glycol.

Agents that promote dissolution may constitute, for example, urea, triethanolamine, triisopropanolamine or 2-dimethylaminoethanol.

The compounds of formula (1) and their mixtures are suitable for use as optical brighteners for bleaching textiles, paper, cardboard and non-woven materials. They are especially applicable for bleaching paper and cardboard and are suitable for use or aqueous suspension of the pulp or to the surface of the paper, especially in pigmented covering composition. They are characterized by high stability in storage, access and ease of use. They are also compatible with other additives, as is but used in the production of cellulosic materials especially paper and cardboard.

EXAMPLES

The following examples will demonstrate the present invention in more detail. Unless otherwise specified, "parts" denotes "parts by weight"and "%" means "wt.%". Membrane filtration was carried out using the membrane element for thin film ultrafiltrable G-series supplied by GE Infrastructure Water &Process Technologies.

Example 1

291 part of the amine of formula (3)

was added at 60°C to a stirred suspension 824 parts of the compounds of formula (4)

in 7750 parts of water. The mixture was heated to boiling and held at these conditions for 4 hours, keeping the pH at 8,5-9,0 by adding sodium hydroxide in the form of a 30% aqueous solution. Added 44 parts of sodium chloride and the mixture was stirred while boiling under reflux for a further 10 minutes. Then the mixture was cooled to 90°C before stopping the stirring. After standing for 10 minutes, lower the oil phase (1990 parts)containing the compound of the formula (A), separated from the containing salt aqueous phase was added at 80°C, under stirring, to 1570 parts of cold water. Thus obtained solution is then treated at 50°C with a solution of 197 parts of 2-dimethylaminoethanol in 350 parts of cold water and 197 parts of 37% aqueous hydrochloric acid. The mixture was stirred pri°C for 10 minutes, then was cooled to 20°C. After standing for 1 hour the lower oil phase was separated and diluted with water to 5000 pieces. Excess sodium chloride and alkanolamine was removed by membrane filtration of an aqueous solution, prior to removal of water by distillation, which gave 3520 parts of an aqueous solution containing 28% of compounds of formula (5)

Thus obtained aqueous solution was stable to storage at 4°C for at least two weeks, or in the absence or in the presence of a seed crystal.

Example 2

Comparative example showing the advantage in comparison with the counterion (CH3)3N+CH2CH2OH (stated in Japanese patent application 62-273266).

Example 1 continued to the place where the oil (1990 parts) were first separated from the containing salt aqueous phase. Then the oil was poured into a mixed solution of 309 parts of holdingarea in 2700 parts of water. The excess salt was removed by membrane filtration of an aqueous solution, prior to removal of water by distillation, which gave 3520 parts of an aqueous solution containing 28% of compounds of formula (6)

Thus obtained aqueous solution gave a residue within 4 days when stored at 4°C in the presence of a seed crystal.

Example 3

Compare the local example, showing the advantage in comparison with the counterion (CH3)2C(NH3+)CH2OH (described in WO 2005/028749 Al)

Example 1 continued to the place where the oil from the first separation phase (1990 parts) was diluted with water (1570 parts). Thus obtained solution is then treated at 50°C with a solution of 196 parts of 2-amino-2-methyl-1-propanol in 350 parts of cold water and 197 parts of 37% aqueous hydrochloric acid. The mixture was stirred at 50°C for 10 minutes, then was cooled to 20°C. After standing for 1 hour the lower oil phase was separated and diluted with water to 5000 pieces. Excess sodium chloride and alkanolamine was removed by membrane filtration of an aqueous solution, prior to removal of water by distillation, which gave 3520 parts of an aqueous solution containing 28% of compounds of formula (7)

Thus obtained aqueous solution gave a residue within 4 days when stored at 4°C in the presence of a seed crystal.

Example 4

Comparative example showing the advantage in comparison with the counterion H3N+CH2CH2OH

Example 1 continued to the place where the oil from the first phase separation (1990 parts) was diluted with water (1570 parts). Thus obtained solution is then treated at 50°C with a solution of 135 parts e is anolamine in 350 parts of cold water and 197 parts of 37% aqueous hydrochloric acid. The mixture was stirred at 50°C for 10 minutes, then was cooled to 20°C. After standing for 1 hour the lower oil phase was separated and diluted with water to 5000 pieces. Excess sodium chloride and alkanolamine membrane was removed by filtration of an aqueous solution, prior to removal of water by distillation, which gave 3520 parts of an aqueous solution containing 27% of the compound of formula (8)

Thus obtained aqueous solution gave a precipitate within 1 day when stored at 4°C in the presence of a seed crystal.

Example 5

Comparative example showing the advantage in comparison with Na+-counterion

Example 1 continued to the place where the oil from the first phase separation (1990 parts) was diluted with water (1570 parts). Excess sodium chloride was removed by membrane filtration of an aqueous solution at 50°C before removal of water by distillation, which gave 3520 parts of an aqueous solution containing 26% of compounds of formula (A).

Thus obtained aqueous solution gave a precipitate when cooled to room temperature.

Example 6

Example 1 continued to the place where the oil (1990 parts) were first separated from the containing salt aqueous phase. Oil was added at 80°C under stirring to a solution of 171 parts of 37% aqueous hydrochloric acid and 150 parts of 2-dimethylaminoethanol in 1582 parts holo is Noah water. The mixture was stirred for 10 minutes and cooled to 20°C. After standing for 1 hour the lower oil phase was separated and diluted with water to 5000 pieces. The aqueous solution was treated by membrane filtration to remove excess sodium chloride, then concentrated by distillation. Then added 7 parts of 2-dimethylaminoethanol as additives to facilitate dissolution. The strength of the solution was normalized, which gave 3520 parts of an aqueous solution containing 28% of compounds of formula (9) and 0.2% 2-dimethylaminoethanol.

Thus obtained aqueous solution was stable to storage at 4°C for at least two weeks, or in the absence or in the presence of a seed crystal.

Application example 1

The product from preparative example 1 was added in the concentration range of dry fiber from 0.2 to 2 wt.% to 200 parts of a 2.5% aqueous suspension of a mixture of 50:50 bleached spruce sulphite cellulose and bleached beech sulfite pulp, beaten to a moisture content 200SR for Shopper Rieger (Schopper Riegler). The suspension was stirred for 5 minutes, then was diluted to 1000 parts. Then, the paper sheet is produced by passing the suspension through the wire frame. After pressing and drying the paper was measured in white on the Minolta spectrophotometer CM-700d.

Table 1
Concentration (%)White on CIE
077,9
0,2118,7
0,4133,6
0,8142,3
1,2146,8
1,6148,2
2,0148,9

The results in table 1 clearly show excellent whitening effect provided by the connection according to the invention.

Application example 2

Was prepared covering composition containing 500 parts of chalk (available commercially under the trade name Hydrocarb 90 from OMYA), 500 parts of clay (commercially available under the trademark of SPS Kaolin from IMERYS), 470 parts of water, 6 parts of dispersing agent (sodium salt of polyacrylic acid, commercially available under the trademark Polysalz S from BASF), 200 parts of latex (copolymer of acrylic ester, commercially available under the trade name Acronal S320D from BASF), 40 parts of 10% solution of polyvinyl alcohol (commercially available under the trade Mowiol 4-98 from Kuraray) in water and 50 parts of a 10% solution of carboxymethyl cellulose (commercially available under the trademark Finnfix 5,0 from Noviant) in water. The solids content was brought to 60% by adding water and the pH was brought to 8-9 by the action of sodium hydroxide.

The product from preparative example 1 was added at concentrations of 0.5, 1.0 and 1.5% for mixed covering composition. Brightening cover composition is then deposited on commercial 75 g/m2neutral-primed white base paper sheet with the use of an automatic wire otherwise piece feeding device with a standard set speed and the standard load on the bar. Coated paper was then dried for 5 minutes in a hot air stream. The dried paper was allowed to reach standard conditions, then measured the brightness CIE on the calibrated Elrepho spectrophotometer.

Table 2
Concentration (%)White on CIE
090,2
0,5105,2
1,0108,9
1,5109,6

The results in table 2 clearly show excellent whitening effect, provide the the group according to the invention.

1. The compound of formula (1)

in which
R represents a hydrogen atom,
R1is a β-hydroxyalkyl radical having 2-4 carbon atom,
R2represents a hydrogen atom,
M+represents Na+and
n is less than or equal to 1.5.

2. The compound according to claim 1, in which
R1is a β-hydroxyalkyl radical having 2 or 3 carbon atoms.

3. The compound according to claim 1, in which
R1is a β-hydroxyalkyl radical having 2 carbon atoms.

4. The compound according to claim 1, in which R1represents-CH2CH2HE, and n is less than or equal to 1.2.

5. An aqueous solution containing as the active substance from 20 to 40 wt.% at least one of the compounds of formula (1) according to any one of claims 1 to 4.

6. An aqueous solution according to claim 5, in which the concentration of the active substance ranges from 25 to 35 wt.%.

7. An aqueous solution according to claim 5 or 6, containing optionally one or more carriers, antifreeze agents, defoamers, reagents, contributing to the dissolution, preservatives, complexing agents and organic by-products formed in the process of obtaining an optical bleach.

8. The method of obtaining compounds of formula (1) according to any one of claims 1 to 4, where the compound of the formula (2)

in the form of an aqueous solution is converted into a mixed salt form (1), in which at least 25% M+ions associated with the sulphonate groups, substituted ions (CH3)2NH+CH2CH2OH, or by treating 2-dimethylaminoethanol and mineral acid, or by sequential processing of cation-exchange resin and 2-dimethylaminoethanol.

9. The method of claim 8 where the compound of formula (1) is isolated and optionally separated from the excess salts and alkanolamine by membrane filtration.

10. The method of obtaining solutions according to claim 7, where additional components are added to aqueous solution, resulting in obtaining the compounds of formula (1).

11. The use of compounds of formula (1) according to any one of claims 1 to 4 or aqueous solutions on pp.5-7 for optical bleaching of textiles, paper, cardboard and non-woven materials.

12. The application of item 11 to the aqueous suspensions of the pulp.

13. The method of bleaching paper, which includes major stages:
- providing a suspension of the pulp;
- adding from 0.01 to 2 wt.%, counting on dry fiber, of an aqueous solution according to any one of pp.5-7;
the production of paper sheet from said pulp suspension;
- pressing and drying the sheet.

14. The method of bleaching paper, which includes major stages:
- getting water covering a song by a joint is messenia chalk or other white pigments, one or more dispersing agents, the primary latex binder and optional secondary binder, and optionally other additives;
- adding from 0.01 to 3 wt.%, counting on the dry pigment, an aqueous solution according to any one of pp.5-7;
- application covering the composition on a paper sheet;
- drying coated paper sheet.



 

Same patents:

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.

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9 cl, 3 tbl, 3 ex

FIELD: chemistry.

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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.

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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.

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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.

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7 cl, 1 tbl, 3 ex

The invention relates to exhaust the forms of optical brighteners, designed for optical bleaching of cellulosic textile materials and paper

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of treating and modifying materials. Described is a method of preparing materials which protects said materials from UV radiation and ozone using a modifier, involving obtaining the modifier by reacting a stilbene derivative in form of 4,4'-bis(s-triazinyl-)diamine-2,2'-disulphostilbene at temperature of up to 55°C in the presence of water with diamine of carbonic acid in amount of 0.5-55 wt % with respect to weight of said stilbene derivative, and material such as foamed or foamable plastic, cement or concrete is then directly treated with the prepared modifier, and/or active radicals of said modifiers are introduced into the surface of said materials. Described also is a method of preparing materials for their protection from UV radiation and ozone using a modifier, involving obtaining the modifier by inoculating a stilbene derivative in form of 4,4'-bis(s-triazinyl-)diamine-2,2'-disulphostilbene with solid diamine of carbonic acid with crystal size less than 40 mcm at 55°C in the absence of water, by grinding the modifiers in a mill and homogenisation at ambient temperature for more than 4 hours, with amount of diamine of carbonic acid of 0.1-45 wt % with respect to the solid stilbene derivative, and material such as foamed or foamable plastic, cement or concrete is then directly treated with the prepared modifier, and/or active radicals of said modifiers are introduced into the surface of said materials.

EFFECT: elimination of negative effect of UV radiation and ozone on surface of materials.

2 cl, 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: 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: 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

The invention relates to an improved process for the preparation of finely granulated optical brighteners creatinineclearance number used for optical bleaching of textile materials

The invention relates to a method of obtaining in the form of stable aqueous solutions of compounds of the formula I:

< / BR>
where K=N, SO3M;

M=Na, K, mono-, di-, triethanolamine

The invention relates to new compounds of the number of 4,4'-diaminostilbene-2,2'-disulfonic acid, which can be used as fluorescent whitening tools

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

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