High solids and low viscous aqueous slurries of calcium carbonate-comprising materials with improved rheological stability under increased temperature

FIELD: chemistry.

SUBSTANCE: present invention discloses aqueous slurries with improved rheological stability at temperature higher than 65 °C. Said slurries include calcium carbonate containing material and at least one comb-like polymer. Specific viscosity of comb-like polymer, measured at 20 °C and concentration of 45 g/l, differs from specific viscosity measured at 70 °C by 0.15–0.5. Cloud temperature of comb-like polymer, measured in water, is not in range of 20–95 °C. Specific charge of comb-like polymer at pH 8 from -10 C/g to -600 C/g. Viscosity of aqueous slurry at temperature 20–90 °C is 25–1,000 mPa⋅s.

EFFECT: decreased thermal sensitivity of slurry and prevention of increase in viscosity thereof in process of manufacture and use at temperatures exceeding 65 °C.

22 cl, 1 dwg, 7 tbl, 6 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to emulsion for paper gluing, which includes gluing agent based on maleated vegetable oil, representing maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated. Invention also relates to paper-gluing agent, including maleated vegetable oil, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, and alkenyl succinic anhydride, and/or fatty acid anhydride, and/or anhydride of fatty acid and acetic acid, and/or anhydride of fatty acid and rosin acid. It also relates to method of obtaining paper-gluing emulsion, including emulsification of gluing agent based on maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, in water phase by means of emulsifier and/or by means of intensive mixing; or mixing maleated vegetable oil, which represents maleated triglyceride, in which at least 50 wt % of the total content of fatty acids in triglycerides are monounsaturated, with alkenylsuccinic anhydride and/or fatty acid anhydride.

EFFECT: invention makes it possible to increase gluing efficiency.

26 cl, 17 ex, 7 tbl, 6 dwg

FIELD: textile; paper.

SUBSTANCE: composition contains a fibrous mixture from chemical and thermomechanical mass and cellulose. The fibrous mixture contains birch leached chemical and thermomechanical mass with extent of grinding 60-125 ml (CSF) and cellulose with grinding extent of 350-500 ml (CSF) at the specified ratio of components. The cellulose in the fibrous mixture is a leached pine sulfate cellulose and/or pine sulphite cellulose, or pine cellulose, and/or leaf cellulose.

EFFECT: expansion of leaf-bearing soft woods due to using birch leached chemical and thermomechanical mass to prepare a fibrous semi-finished product to produce paper with high physical mechanical indices to ensure extent of whiteness.

3 cl, 1 tbl

Wipe product // 2430709

FIELD: medicine.

SUBSTANCE: wipe product relates to absorbent paper products. A wipe product represents a wipe sheet having a first side and a second side. The wipe sheet contains cellulose fibres in an amount at least 50 wt %, and an additional composition containing polymer. The additional composition is present at least on the first side of the wipe sheet. The wipe product has extensionality exceeding 3 cm3/g, a fluffiness test value less than approximately 3 mg, and the first side of the wipe sheet has a stick-slip value more than approximately 0.01. The additional composition contains a non-fibrous olefin polymer, ethylene carboxylic acid copolymer or their mixture. The additional composition can be included in a wipe cloth by means of fibre combination to be used for cloth formation. Alternatively, the additional composition can be superficially applied on the formed cloth.

EFFECT: better quality of the wipe product.

20 cl, 42 dwg, 18 tbl, 7 ex

FIELD: textile, paper.

SUBSTANCE: method includes moistening pulp lap with water solution of sodium salt of carboxymethylcellulose (NaCMC), included into composition of the paste made of a filler (chalk), mixed with a solution of NaCMC at the filler ratio of NaCMC equal to 100:(1-2). Production of moisture-saturated air suspension of fibres with filler from it. Forming a fibrous later on a shaping mesh. Moistening of a fibrous layer between two clothes, pressing and drying of a paper leaf. The filler is added as a paste, which contains 30% of dry substance. Moistening of a fibrous layer prior to pressing is carried out with a starch solution with concentration of 0.7-1.3%.

EFFECT: increased retention of filler in paper at simultaneous increase of paper strength index.

3 cl, 1 tbl, 4 ex

FIELD: textile, paper.

SUBSTANCE: method to prepare bleached paper material includes production of a bleached paper material and putting the latter in contact with efficient quantity of one or more oxidants, excluding organic peroxyacids. The method to produce a paper item includes production of a bleached paper mass. Water suspension from this mass is created. The suspension is dehydrated to make a sheet and drying. At the same time efficient quantity of one or more oxidants are added into the bleached paper mass or its suspension, excluding organic peroxyacids. Or an efficient quantity of one or more oxidants are added onto a sheet, including organic peroxyacids. The method to produce a paper item (a version) includes production of a bleached paper mass and creation of a thick suspension from it. Then the efficient quantity of one or more oxidants are added into the thick suspension, as well as one or more optical bleaches. Afterwards the thick suspension is dissolved, dehydrated to produce a sheet and dried. When using oxidants in a combination with optical bleaches and/or chelating agents, a synergetic effect is observed.

EFFECT: increased and stabilised brightness of a paper mass or paper and increased stability to their yellowing.

24 cl, 9 tbl

FIELD: textile, paper.

SUBSTANCE: method includes dissolution of cellulose and its grinding down to specified extent of grinding. Preparation of the first dispersion with application of return water, containing fibres of microcrystal cellulose, produced by its grinding in mixture with titanium dioxide and calcium hydroxide in specified amount. The second dispersion is prepared from cellulose fibres with application of return water. Then the first suspension is mixed with the second, and produced mixture is treated with carbon dioxide. In case of this treatment calcium hydroxide under action of carbon dioxide results in production of chemically deposited chalk and production of paper mass at specified ratio of components. Grinding of microcrystalline cellulose in mixture with titanium dioxide and calcium hydroxide is carried out in vibration mill with provision of impact and wear effect at mixture.

EFFECT: increased extent of fillers retention in paper, improvement of its printing properties, provision of possibility to vary bulk and porosity of paper, provision of possibility to use fully closed cycle of return water.

1 tbl, 8 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: napkin article with density of over 3 cm3/g includes a napkin made from cellulose fibre and an additive composition on the first side of the napkin which contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof. The napkin article is made using a method which involves preparation of an aqueous suspension of cellulose fibre, forming a napkin from the aqueous suspension of fibre and drying the napkin. The additive composition is deposited on dry fibres before preparation of the aqueous suspension of fibre, and is added to the aqueous suspension of fibre or for formation of the napkin. The additive composition contains a non-fibrous olefin polymer, an ethylene-carboxylic acid copolymer or mixture thereof and a dispersing agent.

EFFECT: high strength of the napkin without considerable negative effect on softness.

28 cl, 26 dwg, 6 tbl, 3 ex

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

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

Latex compositions // 2521585

FIELD: chemistry.

SUBSTANCE: invention relates to latex compositions, which are applied in coatings for paper. A latex binding agent for coating of pigmented paper contains particles of emulsion copolymer, which contains (i) from 15 to 35 wt % of repeated links, obtained by acrylonitrile polymerisation; (ii) from 25 to 65 wt % of repeated links obtained by polymerisation of conjugated diene monomer, and (iii) from 5 to 55 wt % of repeated links, obtained by polymerisation of alkenyl aromatic monomer, counted per the total weight of the repeated links in a particle.

EFFECT: invention makes it possible to provide better balance of paper coating properties.

16 cl, 2 tbl

FIELD: textiles, paper.

SUBSTANCE: invention describes two versions of security paper containing a watermark of two fragments that make up a single image visible in transmitted light when folding of the security paper along the line located between two fragments of the watermark, and the imposition of the obtained areas of the paper with fragments of the watermark on one another, and the paper is manufactured based on milled cotton cellulose with the addition of wood cellulose and/or cellulose of annual plants, and/or flax cellulose, and/or polyester fibers, and/or polyamide synthetic fibers, on fourdrinier former or cylinder mould machine and comprises areas with increased transparency, located symmetrically with respect to the fold line of the overlapping fragments of the watermark. The shape and size of these fragments corresponds to overlapping fragments of the watermark, so that the boundaries of the areas with increased transparency when folding of the paper coincide completely with the boundaries of the relevant dark fragments of the watermark. Also several versions of methods of manufacturing of such paper are described.

EFFECT: increased contrast ratio and improved inside-light perception of a whole image of the watermark.

12 cl, 4 ex, 5 dwg

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: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: textiles; paper.

SUBSTANCE: composition is designed for refining fibrous material, can be used in the production of enamelled cardboard and paper and relates to the cellulose-paper industry. The composition contains a modified pigment and a water soluble binding substance. The pigment is calcium sulfoaluminate, modified starch or polyvinyl alcohol with mass ratio content of 0.5-1.5. The water soluble binding substance is starch.

EFFECT: resistance to fluffing and whiteness of the coating with considerable lowering of consumption of the binding substance when making the composition.

1 tbl

FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.

SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.

EFFECT: simplified method and improved quality of paper sheet.

17 cl, 16 dwg, 1 tbl, 3 ex

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m2/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

FIELD: paper coated with composition for coating various kinds of paper, for offset printing of paper used for manufacture of books, magazines, annual reports, or packaging paper.

SUBSTANCE: composition comprises pigments and binder. Composition pigments are formed as microballs having sizes below 10 micrometers, preferably about 7 micrometers. Paper coated with such composition is silky by touch and has at least one surface coated with such composition, preferably both of its surfaces. This paper may be tracing paper.

EFFECT: improved quality of paper owing to preventing sliding thereof during separation of sheets in stacks, delamination of coating during printing process and, accordingly, elimination of paper dusting and formation of impure imprints.

7 cl, 2 dwg, 2 tbl, 13 ex

FIELD: textiles, paper.

SUBSTANCE: invention may be used in the pulp and paper industry. The photodecomposable paper comprises titanium dioxide modified with carbon, which is distributed among the paper fibres. Carbon can be placed inside and/or on the surface of the titanium dioxide modified with carbon.

EFFECT: proposed invention enables to increase the rate of decomposition of paper under the influence of light.

14 cl, 2 tbl

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