Improved optical bleaching compositions

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

 

The technical field to which the invention relates.

The present invention relates to compositions that provide excellent optical whitening effects when applied to the surface of the paper at the size press.

The level of technology

High degree of whiteness is an important parameter for the end-consumer paper products. The most important raw material for the paper industry is the cellulose, pulp and lignin, which naturally absorb blue light, so they have a yellowish color and give the paper an unsatisfactory visual characteristics. In the paper industry optical brighteners are used to compensate for the absorption of blue light by absorption of UV light with a maximum wavelength of 350-360 nm and converting it into visible blue light with a wavelength of 440 nm.

In the manufacture of paper optical brighteners can be added to or into the wet part of the paper machine, or on a paper surface, or in both places. As a rule, it is impossible to provide a high degree of whiteness required for paper high quality, plus bleach only wet part of the paper machine.

The usual way of adding an optical Brightener to the surface of the paper consists of applying an aqueous solution of the optical otbelivanie is on sizing press with a sizing agent, usually natural starch or starch, modified enzymes or chemically modified starch. The pre-formed sheet of paper is passed through the nip between the two rollers, and the entrance to the nip filled with a solution for gluing. The paper absorbs a quantity of a solution, the residue is removed in the nip.

Along with starch and optical bleach solution for gluing may contain other chemicals designed to provide specific properties. They include defoamers, paraffin wax, dyes, pigments, and inorganic salts.

With the aim of obtaining high degrees of whiteness, efforts were made to develop new optical brighteners (See, for example, Japanese Kokai 62-106965, PCT application WO 98/42685, U.S. Patent 5,873,913 and European patent 1,763,519).

In the United Kingdom patent 1239818 described hexachlorophane optical brighteners, obtained from triethynylbenzene. In examples 1-6 described their sodium salts. Magnesium is mentioned only in the list of possible counterions for hexachlorophane optical brighteners, starch as a component of the composition for sizing the surface is also mentioned only in the list of possible binding agents.

The need for more effective means to achieve you is okeh degrees of whiteness of the paper is still in place.

Disclosure of inventions

The authors of the present invention surprisingly found that the optical brighteners of the formula (1) when applied to the surface of the paper, in combination with salts of magnesium, in the composition for sizing, starch-containing, enhance the bleaching action. Unless otherwise stated, the parts in the following statement mean mass part.

The present invention relates to a method of bleaching paper in the size press, characterized in that the composition for sizing contains

(a) at least one optical Brightener of formula (1)

in which

R1denotes hydrogen or SO3M,

R2denotes hydrogen or SO3M,

R3denotes hydrogen, C1-4alkyl, C2-3hydroxyalkyl, CH2CO2M, CH2CH2CONH2or CH2CH2CH,

R4represents C1-4alkyl, C2-3hydroxyalkyl, CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M, benzyl or

R3and R4 together with the adjacent nitrogen atom represent morpholino ring, and where

M denotes hydrogen, a cation of an alkali metal, ammonium, mono-methyl-di-C2-C3-hydroxyethylammonium, dimethyl-mono-C2-C3-hydroxyethylammonium, ammonium that is mono-, di-or tizamidine C 2-C3hydroxyalkyl radical, and mixtures of these compounds,

(b) a salt of magnesium and

(c) a binder that is selected from the group consisting of natural starch, starch modified by enzymes and chemically modified starch, and 0.1 to 15 parts of component (b) per part of component (a).

Preferred compounds of formula (1) are compounds in which R3denotes hydrogen, methyl, ethyl, n-propyl, isopropyl, β-hydroxyethyl, β-hydroxypropyl, CH2CO2M, CH2CH2CONH2or CH2CH2CN, and R4denotes methyl, ethyl, n-propyl, isopropyl, 2-butyl, β-hydroxyethyl, β-hydroxypropyl, CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M or benzyl.

Optical brighteners of the formulae (2) and (3) are specific examples of optical brighteners of the formula (1), but the invention is not limited to these two specific examples.

Salt of magnesium can represent, for example, magnesium acetate, magnesium bromide, magnesium chloride, magnesium formate, magnesium iodide, magnesium nitrate, magnesium sulfate or magnesium thiosulfate. Preferably, the magnesium salt is a magnesium chloride, magnesium sulfate or magnesium thiosulfate. Most predpochtitelnei magnesium salt is magnesium chloride.

Preferably one part of component (a) is 0.15 to 10 parts of component (b). Most preferably, if one part of the component (a) accounts for 0.4-5 parts of component (b).

For processing of paper in the size press can be used in compositions for sizing containing 0.2 to 30, preferably 1-15 grams optical Brightener per liter. Composition for sizing also contains a binder in a concentration of preferably 2-15% (mass), based on the total weight of the composition for sizing. Typically, the pH is from 5 to 9, preferably from 6 to 8.

The binder or adhesive selected from the group consisting of natural starch, starch modified by enzymes and chemically modified starch. Modified starches preferably represent oxidized starch, gidroksietilirovanny starch or acetylated starch. Natural starch preferably is an anionic starch, cationic starch or amphoteric starch. Although the source of the starch may be of any preferred sources of starch are corn, wheat, potato, rice, tapioca or sago. Can be one or more additional binder, preferably polyvinyl alcohol or carboxymethylcellulose.

The following object izobreteny what is the way of the optical bleaching of paper, includes stage

a) applying the composition for sizing paper,

b) drying the treated paper.

To the composition for sizing preferably added antifoam, paraffin emulsion, the dye and/or pigment.

The following examples more detail about the present invention. If not specified, it is understood that the terms "%" and "parts" refers to mass%" and "parts".

The implementation of the invention

Example 1

Compositions for sizing obtained by adding an optical Brightener of the formula (2) in such amount to achieve a final concentration of optical Brightener in the interval from 2.5 to 12.5 g/l, to a mixed aqueous solution of magnesium chloride (final concentration is 8 g/l) and anionic oxidized potato starch (Perfectamyl A4692 from AVEBE, VA) (final concentration is 50 g/l) at 60°C.

The solution for sizing is allowed to cool, then pour on the moving rollers of a laboratory size press and put on a taped commercial 75 g/m2AKD (dimer of alkylbetaine), discolored sheet of base paper. The treated paper is dried for 5 minutes at 70°C. in a dryer with flat plates. The dried paper is brought to the required condition, then measure the brightness CIE on the calibrated spectrophotometer "Elrepho".

The example is repeated, and in the absence of the influence of magnesium chloride, i.e. in the presence of only sodium salts of optical Brightener, and replacing magnesium chloride an equivalent amount of calcium chloride.

The results are summarized in table 1 and convincingly demonstrate the advantages of using magnesium chloride as compared with the use of calcium chloride and using only sodium salts of optical Brightener to obtain high degrees of whiteness. The unexpected nature of the invention is additionally illustrated by data that chlorides divalent ions of other metals of group II, such as calcium chloride, even have a negative effect on the bleaching effect of the optical Brightener.

Table 1
Optical bleach (2) (g/l active substances)Magnesium chloride (g/l)Calcium chloride (g/l)White on CIE
000104,6
080104,7
008104,8
2,500122,3
2,580a 126.7
2,508123,4
5,000128,3
5.080133,1
5,008USD 128.0
7,500129,8
7,580133,7
7,508of 128.6
10,000RB 131.1
10,080 134,5
10,008128,2
12,500to 130.6
12,580134,2
12,508RUB 127.3

Example 2

Compositions for sizing obtained by adding an optical Brightener of the formula (3) in such a quantity to achieve a final concentration of optical Brightener in the range of from 2.0 to 10 g/l, to a mixed aqueous solution of magnesium chloride (final concentration is 8 g/l) and anionic oxidized potato starch (Perfectamyl A4692 from AVEBE, VA) (final concentration is 50 g/l) at 60°C.

The solution for sizing is allowed to cool, then pour on the moving rollers of a laboratory size press and put on a taped commercial 75 g/m2AKD (dimer of alkylbetaine), discolored sheet of base paper. The treated paper is dried for 5 minutes at 70°C. in a dryer with flat plates. The dried paper is brought to the required condition, then measure the brightness CIE on the spacecraft is brovana spectrophotometer "Elrepho".

The example is repeated, and in the absence of magnesium chloride, and replacing magnesium chloride an equivalent amount of calcium chloride.

The results are summarized in table 2 and convincingly demonstrate the advantages of using magnesium chloride as compared with the optical bleach only in the form of sodium salt to obtain high degrees of whiteness.

Table 2
Optical bleach (3) (g/l active substances)Magnesium chloride (g/l)Calcium chloride (g/l)White on CIE
000104,6
080104,7
008104,8
2,000119,2
2,080122,5
2,0 08121,5
4,000127,2
4,080RB 131.1
4,008127,9
6,000RB 131.1
6,080135,4
6,008humidity 131.6
8,000133,7
8,080138,1
8,008133,5
10,000136,0
10,0 80139,7
10,008134,7

Example 3

Compositions for sizing receive, adding an optical Brightener of the formula (3) in such a quantity to achieve a final concentration of optical Brightener in the interval from 0 to 12.5 g/l, to a mixed aqueous solution of magnesium chloride (final concentration is 6.25 and 12.5 g/l) and anionic oxidized corn starch (final concentration is 50 g/l) (Penford Starch 260) at 60°C. Each solution for sizing is allowed to cool, then pour on the moving rollers of a laboratory size press and put on a taped commercial 75 g/m2AKD (dimer of alkylbetaine) discolored sheet of base paper. The treated paper is dried for 5 minutes at 70°C. in a dryer with flat plates.

The dried paper is brought to the required condition, then measure the brightness CIE on the calibrated spectrophotometer Auto Elrepho".

The results are shown in table 3.

Example 4

Compositions for sizing receive, adding an optical Brightener of the formula (3) in such a quantity to achieve a final concentration of optical Brightener in the interval from 0 to 12.5 g/l, for mixed water Rast is oram uranyl magnesium thiosulfate (final concentration is 10 and 20 g/l) and anionic oxidized corn starch (Penford Starch 260) (final concentration is 50 g/l) at 60°C. The solution for sizing is allowed to cool, then pour on the moving rollers of a laboratory size press and put on a taped commercial 75 g/m2AKD (dimer of alkylbetaine), discolored sheet of base paper. The treated paper is dried for 5 minutes at 70°C. in a dryer with flat plates.

The dried paper is brought to the required condition, then measure the brightness CIE on the calibrated spectrophotometer Auto Elrepho".

The results are shown in table 3.

Table 3
White on CIE
Optical bleach (3) (g/l active substances)Salt Mg is absent, i.e. only salt NaAdded salt magnesium
Magnesium chloride (g/l) (example 3)The uranyl magnesium thiosulfate (g/l) (example 4)
6,2512,510,020,0
0102,8102,9103,5 102,7
2,5119,6122,4output reached 125.5125,1123,6
5,0128,9RB 131.1132,5132,9132,7
7,5135,1136,3137,9137,7137,9
10,0139,2140,9141,4141,1141,0
12.5141,1142,3of 142.8142,4142,4

The results convincingly demonstrate the advantages of using magnesium chloride or magnesium thiosulfate to achieve high degrees of whiteness in comparison with cases where the optical Brightener is used only in the form of sodium salt.

1. Composition for sizing paper, characterized in that it contains
(a) at least one protected area is ical bleach formulas (1)

in which
R1denotes hydrogen or SO3M,
R2denotes hydrogen or SO3M,
R3denotes hydrogen or CH2CO2M,
R4denotes CH2CO2M, CH(CO2M)CH2CO2M or CH(CO2M)CH2CH2CO2M, where
M denotes hydrogen, a cation of an alkali metal, ammonium, mono-methyl-di-C2-C3-hydroxyethylammonium, dimethyl-mono-C2-C3-hydroxyethylammonium, ammonium that is mono-, di - or tizamidine C2-C3hydroxyalkyl radix, or mixtures of these compounds,
(b) a salt of magnesium and
(c) a binder that is selected from the group consisting of natural starch, starch modified by enzymes and chemically modified starch, and 0.1 to 15 parts of component (b) falls PA one part of the component (a).

2. Composition for sizing according to claim 1, in which 0.15 to 10 parts of component (b) per part of component (a).

3. Composition for sizing but to claim 1, in which 0.4 to 5 parts of component (b) per part of component (a).

4. Composition for sizing according to claim 1, in which component (b) is magnesium acetate, magnesium bromide, magnesium chloride, magnesium formate, magnesium iodide, magnesium nitrate, magnesium sulfate or magnesium thiosulfate.

Campsite for sizing according to claim 1, in which component (b) is magnesium chloride.

6. Composition for sizing according to claim 1, in which component (b) is a magnesium thiosulfate.

7. Composition for sizing according to claim 1, where the amount of binder is from 2 to 15 wt.% calculated on the total weight of the composition for sizing.

8. Method of optical bleaching of paper, which includes stages
a) applying the composition for sizing according to one or more items 1-7 on paper,
b) drying the treated paper.

9. Way but claim 8, comprising the additional step of adding antifoam, paraffin wax, dye and/or pigment in the composition for sizing.



 

Same patents:

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: 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: 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: chemistry.

SUBSTANCE: present invention relates to a method of producing an alkenyl-substituted cyclic anhydride, comprising the following steps: isomerising one or more olefinically unsaturated C6-C28 hydrocarbons, from which at least 30 wt % is alpha-olefin, by contacting said hydrocarbons with a catalyst which contains an alkali metal on a support, and reacting the formed isomerised C6-C28 olefin hydrocarbons with a cyclic anhydride of an unsaturated dicarboxylic acid to form an alkenyl-substituted cyclic anhydride.

EFFECT: invention relates to use of said compound as a paper sizing additive and a method of producing said additive based on the obtained alkenyl-substituted cyclic anhydride.

20 cl, 2 tbl, 4 ex

Packing laminate // 2455169

FIELD: process engineering.

SUBSTANCE: invention relates to production and application of packing laminate and to food and drink package made therefrom. Laminate comprises, at least, one main layer of paper or cardboard and, at least, one barrier layer for fluid and, preferably, at least one barrier layer for gas. Paper or cardboard is impregnated with composition containing adhesive selected from the group including ketene dimers and multimers, succinic anhydride, colophony and mixes thereof, as well as acrylamide-based polymer.

EFFECT: higher water resistance.

15 cl, 10 tbl, 8 ex

FIELD: textiles, paper.

SUBSTANCE: paper base is intended for internal and external sizing, which has high dimensional stability, and can be used in pulp and paper industry. Paper base contains cellulose fibers, at least one filler, and sizing agent. At that the paper base has a coefficient of hygroextension from 0.6 to 1.5%. The Scott internal constraint in the transverse direction is not greater than 300 J/m2, and/or Scott internal constraint in the longitudinal direction is not greater than 300 J/m2. Also a method of manufacturing the paper base and versions of paper base are proposed.

EFFECT: increased dimensional stability and durability of the surface of the paper base.

26 cl, 24 dwg, 15 tbl, 5 ex

Paper sizing // 2429323

FIELD: textile, paper.

SUBSTANCE: invention relates to a water dispersion (its version) of a cellulose-active gluing substance (its version), a method to produce the water dispersion (its version), application of the water dispersion and a method of paper making. The water dispersion of the cellulose-active gluing substance contains an acid anhydride, an anion polyelectrolyte and a nitrogen-containing organic compound, which is an amine or a corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The method to produce the water dispersion of the cellulose-active gluing substance and its version includes dispersion of the acid anhydride in the water phase in presence of the anion polyelectrolyte and the nitrogen-containing organic compound, which is the amine or the corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The above specified water dispersions of the cellulose-active gluing substance may be used for sizing in mass or for surface sizing in paper making. The method of paper making includes addition of the above-specified water dispersions of the cellulose-active gluing substance to the water suspension of cellulose with subsequent dehydration of the produced suspension on a net of a paper-making machine or by application of these dispersions onto a surface of a cellulose sheet.

EFFECT: improved stability of the gluing water dispersion and efficiency of sizing, energy and capital cost saving.

41 cl, 13 tbl, 7 ex

FIELD: textile, paper.

SUBSTANCE: ground paper contains a certain amount of cellulose fibres and a gluing substance, besides, ground paper has a coefficient of hygro-expansion from 0.6 to 1.5%, inner link of Scott in cross direction not more than 130 J/m2 and/or inner link of Scott in longitudinal direction of not more than 130 J/m2.

EFFECT: increased stability of dimensions and strength of ground paper surface.

28 cl, 28 dwg, 12 tbl, 5 ex

FIELD: textile, paper.

SUBSTANCE: emulsion contains anhydrides of fatty acids, which are produced from unsaturated or saturated fatty acids or their mixtures with length of chain from 12 to 24 carbon atoms and are preserved as liquid at the temperature below 50°C. If necessary, emulsion for paper sizing additionally contains a reactive or a non-reactive agent for sizing and/or a fixator with aluminium ions content. Emulsion for paper sizing is produced by emulsification of fatty acids in water phase by means of shearing forces or intense mixing. Emulsifiers are used to form emulsion. Emulsion is used for continuous sizing of paper mass or to treat paper surface in sizing press. Emulsion is used to produce paper.

EFFECT: eliminates formation of sediments with sticky consistency with regular indices of pH in process of paper making and reduced duration of contact with water system.

16 cl, 4 tbl, 5 ex

FIELD: construction.

SUBSTANCE: ground contains cation water-fast additive, alkaline glueing agent and anion activator in specified amount. Anion activator it contains is a component selected from group, including polyacrylate, sulfonate, carboxymethylcellulose and galactomannan hemicellulose. Ground paper has pH from approximately 7.0 to approximately 10, and strength of internal link from approximately 25 to approximately 350 millifeet per pound per square inch. This ground paper is produced by contact of a certain amount of cellulose fibres with water-fast additive, alkaline gluing agent and anion activator, serially and/or simultaneously.

EFFECT: improved physical properties of ground paper and expanded assortment of paper tapes to cover joints.

22 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: substrate has a paper base containing cellulose fibre from deciduous wood with particle size smaller than 200 mcm after grinding in amount of not more than 45 wt % and average fibre length between 0.4 and 0.8 mm and filler in amount of 5-40 wt %, particularly 10-25 wt % in terms of the weight of cellulose.The substrate at least contains one polymer layer lying at least on one side of the paper base. There is a layer with a binding agent between the polymer layer and the paper base. The binding agent is a hydrophilic film-forming polymer made from hydroxypropylated starch and/or thermally modified starch. This layer may contain a pigment in form of calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulphate.

EFFECT: reduced limpness and obtaining pure-bred production wastes.

27 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: adhesive contains a basic component in form of brewer's or distiller's yeast which is a waste from the brewing or distillation industry. The residue of brewer's or distiller's yeast is treated with 2% sodium hydroxide solution in ratio of 1:1. The adhesive composition contains the treated residue of brewer's yeast, glycerin and boric acid. Components of the composition are in the following ratio, pts. wt: residue of brewer's or distiller's yeast treated with 2% sodium hydroxide solution in ratio of 1:1 96.0-98.0; glycerin 1.9-3.7; boric acid 0.1-0.3.

EFFECT: adhesive composition has high adhesive capacity and low cost.

2 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

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