초록 ▼

The method of preparing aqueous dispersions of copolymers of styrene dibutyl maleate and acrylic or methacrylic acid or monobutyl maleate consists in adding a monomer mixture comprising styrene in the amount of 40-90% by weight, dibutyl maleate in the amount of 10-60% by weight acrylic or methacryli

The method of preparing aqueous dispersions of copolymers of styrene dibutyl maleate and acrylic or methacrylic acid or monobutyl maleate consists in adding a monomer mixture comprising styrene in the amount of 40-90% by weight, dibutyl maleate in the amount of 10-60% by weight acrylic or methacrylic acid or monobutyl maleate in the amount of 1.0-10.0% by weight in relation to the sum of styrene monomer and dibutyl maleate into the emulsion water known constituents such as: ionic emulsifier - non-ionic emulsifier, buffer, sodium acrylate, N-methylolmethacrylamide to which, prior to polymerization, an alkylene glycol comprising 2-6 carbon atoms in the alkylene group is added. The alkylene glycol is added in the amount of 1-6% by weight in relation to the sum of styrene monomer and dibutyl maleate while, the ratio of alkylene glycol to the methacrylic acid or monobutyl maleate contained in the monomer mixture is 1:0.2-2. The polymerization process is conducted at a temperature of 70°-90°C. up to complete reaction of the monomers, then the reaction mixture is cooled down to a temperature of 10°-30°C. and a single dose of concentrated ammonia water is added to adjust the pH of the composition to about 9.5. The obtained dispersions are used for thermal coating of building materials for protective and decorative purposes.

대표청구항 ▼

A method for preparing an aqueous dispersion of a copolymer of styrene, dibutyl maleate and acrylic or methacrylic acid or monobutyl maleate, said method consisting in emulsion polymerization of a mixture of monomers containing styrene in the amount of 40-90 percent by weight, dibutyl maleate in the

A method for preparing an aqueous dispersion of a copolymer of styrene, dibutyl maleate and acrylic or methacrylic acid or monobutyl maleate, said method consisting in emulsion polymerization of a mixture of monomers containing styrene in the amount of 40-90 percent by weight, dibutyl maleate in the amount of 10-60 percent by weight, and acrylic or methacrylic acid or monobutyl maleate in the amount of 1.0-10.0 percent by weight in relation to the sum total of monomers, said monomer mixture being added to a water phase previously prepared by adding a free radical polymerization initiator in one dose in the amount of 0.3 percent by weight to water containing a mixture of ionic and non-ionic emulsifiers in a ratio of 1:3-10 and in the amount of 2-8 percent by weight; a buffer in the amount of 0.2-1.0 percent by weight; the sodium salt of an ab0.1-1.0 percent by weight; a water souble ethylenically unsaturated monomer containing an N-methylol group in the amount of 0.3-3.0 percent by weight and an alkylene glycol containing 2-6 carbon atoms in the alkylene radical in the amount of 1-6 percent by weight relative to the sum total of monomers, the ratio of alkylene glycol to the amount of acrylic or methacrylic acid or monobutyl maleate contained in the monomer mixture being 1:0.2-2.0; said polymerization being conducted at a temperature from 70°-90°C. until the monomer reaction has been completed and then cooling the reaction mixture to a temperature of 10°-30°C. and neutralizing the mixture to a pH value of 9.5 by the addition of a concentrated water solution of ammonia.