Patent GB-975906-A (GB)
Title: Improvements in polymer compositions
IPC: C09J131/04
Filed: 1961-03-15
Abstract: Aqueous alkaline solutions having a pH of 7 to 9.2 comprise 5 to 20% by weight of an admixture of 50 to 90% by weight of an alkali-soluble copolymer of a vinyl ester with a carboxyl containing monomer copolymerizable therewith said copolymer containing an amount of carboxyl containing monomer which will allow an at least 5% aqueous solution to be prepared, and 10 to 50% by weight of a water-soluble polymer having a viscosity in a 4% aqueous solution at 20 DEG C. of no greater than 100 centipoises. Specified vinyl esters are vinyl acetate, butyrate, stearate, 2-ethylhexoate and benzoate. Specified carboxyl containing monomers are crotonic, itaconic, citraconic and mesaconic acids, and partial esters such as monoalkyl maleates, fumarates and mesaconates, allyl malonic acid esters and ethyl aconitic acid esters. The water-soluble polymer may be polyvinyl alcohol, carboxymethyl cellulose, sodium methylcellulose, starches and gums. The solutions may also comprise plasticisers, e.g. dibutyl and other phthalate esters, phosphate esters, chlorinated biphenyl and citrate esters; coalescing agents, e.g. hexylene glycol, ethylene glycol, the monoethyl ethers of diethylene and propylene glycols, ethylene glycol monoethyl ether acetate and diethylene glycol monobutyl ether acetate; and melting agents, e.g. ethylene oxide condensates with tertiary amines, alkylphenols and polypropylene oxides, sulphosuccinates and alkylaryl sulphonates. The compositions may be used as surface conditions for chalking and crumbling surfaces and cement paints before repainting with emulsion or oleoresinous paints.  Examples describe compositions comprising water, ammonia, polyvinyl alcohol and (1, 2 and 4) vinyl acetate/crotonic acid copolymer, (3) vinyl acetate/monobutyl maleate copolymer, and (5) vinyl acetate/crotonic acid copolymer, dibutyl phthalate, hexylene glycol and sodium sulphate of 7-ethyl -2- methyl -4- undecanol. Specification 657,545 is referred to.ALSO:Chalking surfaces and cement paints may be conditioned before repainting with oleoresinous and particularly emulsion paints by coating with aqueous solutions having a pH of 7-9,2 and comprising 5-20% by weight of an admixture of 50-90% by weight of an alkali-soluble copolymer of a vinyl ester with a carboxyl containing monomer copolymerizable therewith, said copolymer containing an amount of carboxyl-containing monomer which will allow an at least 5% aqueous solution to be prepared, and 10-50% by weight of a water-soluble polymer having a viscosity in a 4% aqueous solution at 20  DEG C. of no greater than 100 centipoises. The preferred copolymers are copolymers of vinyl acetate with crotonic acid or monobutyl maleate.  Specified water-soluble polymers are polyvinyl alcohol, cellulose derivatives, starches and gums.  The solutions may also comprise plasticizers, e.g. phthalates, phosphates, chlorinated biphenyl and citrates; p  coalescing agents, e.g. glycols, glycol ethers and glycol ether esters; and wetting agents, e.g. ethylene oxide condensates with tertiary amines, alkylphenols and polypropylene oxides, sulphosuccinates and alkylaryl sulphonates.  Examples describe the conditioning with solutions comprising water, ammonia, vinyl acetate/crotonic acid copolymer, polyvinyl alcohol, dibutyl phthalate, hexylene glycol and sodium sulphate of 7-ethyl-2-methyl-4-undecanol of cement paint coated cement discs and white paint coated pine panels prior to repainting with polyvinyl acetate emulsion paint.  Specification 657,545 is referred to.