Acids and metal salts or ammonium salts thereof (C08F222/02)

Improved solvent for extraction of maleic anhydride from gas stream // 2607762
FIELD: chemistry.SUBSTANCE: invention relates to methods of producing raw maleic anhydride. In particular, method includes steps where: reactor output stream, containing maleic anhydride, is fed into bottom part of absorption column, where it comes into contact with a non-cyclic solvent, that is fed close to its upper part and is a diester, having a boiling point under normal conditions between 250C and 350C, solubility of fumaric acid at least 0.06 wt% at temperature of 60C, solubility of maleic anhydride at least 10 wt% at temperature of 60C, water solubility not higher than 100 mg/l, density, different from water density at least to 0.020 g/ml, and a water-soluble hydrolysis product with molecular weight not higher than that of pentanol, with transfer of maleic anhydride of outlet stream of reactor into a solvent, wherein gas stream to be extracted is blown off from absorption column, and enriched solvent, containing maleic anhydride, is removed from absorption column near bottom of absorber and directed into flash tower near its middle part, untreated maleic anhydride is removed from stripping column near its middle or upper part.EFFECT: methods make it possible to use cheaper solvent than phthalates.11 cl, 1 dwg, 1 tbl
Curable water-based composition // 2573017
FIELD: chemistry.SUBSTANCE: group of inventions relates to curable water-based composition for obtaining coating on non-woven material, method of manufacturing treated non-woven material, treated with curable water-based composition, and non-woven material, treated with composition. Composition includes copolymer and cross-linking agent. As copolymerised units aid copolymer contains from 1 to 10 wt %, counted per dry weight, of itaconic acid copolymer and from 90 to 99 wt % of copolymerised ethylene-unsaturated monomer, selected from the group, including ethylacrylate, butylacrylate, styrene, methylmethacrylate, acrylic acid, methacrylic acid, acrylonitrile and their mixtures. Cross-linking agent has at least two hydrazine groups, with molar ratio of hydrazine group in cross-linking agent to carboxyl group in copolymer constituting from 0.05 to 2. Water-based composition is cured at temperature from 100C to 250C.EFFECT: high tensile strength in dry, wet and submerged into isopropyl alcohol state.6 cl, 13 tbl, 19 ex

Emulsifying polymers and use thereof // 2467984
FIELD: chemistry.SUBSTANCE: invention relates to emulsifying polymers and use of these polymers for stable emulsification of hydrophobic additives in aqueous concrete plasticisers. Disclosed is a polymer P, obtained via copolymerisation (a) of at least one ethylenically unsaturated monomer A selected from a group consisting of unsaturated mono- and dicarboxylic acids, sulphonic acids, phosphonic acids in form of free acids or salts or partial salts or halide or anhydride, with (b) at least one ethylenically unsaturated monomer B of formula , or , where radicals and coefficients are as described in the claim and (c) with at least one ethylenically unsaturated monomer C of formula , where radicals and coefficients are as described in the claim and with (d) at least one ethylenically unsaturated monomer D of formula , where radicals and coefficients are as described in the claim and optionally (e) with at least one basic ethylenically unsaturated monomer E of formula , where radicals and coefficients are as described in the claim and optionally (f) with at least one other ethylenically unsaturated monomer W. Use of the polymer as a plasticiser for water-curable compositions and a water-curable composition are also disclosed.EFFECT: polymer improves quality of mortar.19 cl, 5 tbl

Flocculant for treating waste water // 2453504
FIELD: chemistry.SUBSTANCE: flocculant has the following composition, wt %: partial magnesium salt of a copolymer of acrylic and methacrylic acid neutralised by 60% (with ratio of monomers: acrylic acid - 45%, and methacrylic acid - 55%) 2.4-3.5; sodium salt of a copolymer of acrylic and methacrylic acid (with ratio of monomers: acrylic acid - 35%, and methacrylic acid 65%) 3.8-5.8; polyacrylamide 1.1-1.5; water - the balance. The flocculant is used in form of process solutions with concentration 0.015-0.035 wt %. 0.035% aqueous flocculant solutions have the highest flocculating power.EFFECT: flocculant has high solubility in water and ensures high efficiency when used to clarify waste water.6 ex
ethod of preparing aqueous solutions of copolymers // 2373228
FIELD: chemistry.SUBSTANCE: method is described for preparing aqueous solutions of copolymers, involving a fundamental step for copolymerisation of partially neutralised acrylic and maleic acid in the presence of hydrogen peroxide in amount of 2 to 4% of total mass of monomers at temperature ranging from 85 to 105C in an aqueous medium, which is realised through gradual addition of an aqueous solution of hydrogen peroxide for 3 to 6 hours into an aqueous solution of partially neutralised maleic acid and simultaneous gradual addition of an aqueous solution of partially neutralised acrylic acid, or an aqueous solution of free acrylic acid, or aqueous solutions of free acrylic acid and a base, and subsequent addition of hydrogen peroxide for 30 to 60 minutes after completion of simultaneous addition of hydrogen peroxide and acrylic acid, and a step for pre-polymerisation by keeping the reaction mixture at polymerisation temperature, distinguished by that, the pre-polymerisation step is realised by keeping the reaction mixture at polymerisation temperature for 35 to 60 minutes, subsequent simultaneous addition of aluminium or potassium persulphate in amount ranging from 0.10 to 0.15% of total mass of monomers and subsequent keeping at polymerisation temperature for 45 to 90 minutes.EFFECT: increased dispersion capacity of copolymers.1 cl, 1 tbl, 8 ex

Sodium salt of a copolymer of acentrella and maleic anhydride as a substance exhibiting ion-exchange properties // 2090573
The invention relates to the chemistry of the modified polymers, specifically to a new sodium salt of a copolymer of acentrella and maleic anhydride (SPAN-MA), and can be used in the chemical industry, including for the separation of mixtures of metal ions, as well as for deposition and codeposition of metals

The way to obtain a latex of a copolymer of vinylidenechloride // 2065449
The invention relates to the field of polymer technology, namely a process for the production of latexes of copolymers of vinylidenechloride (VDH), used in the manufacture of latex paints (VDK), polymer compositions may be used to produce frost-resistant latex copolymers VDH with vinyl chloride (I) unsaturated carboxylic acid (maleic, fumaric, taconova)
 
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