Process for the manufacture of plastics dispersions

Claim 2

A process for the manufacture of a dispersion paint having improved wet adhesion to smooth substrate surfaces comprising the steps of copolymerizing in an aqueous medium one or more mono-olefinically unsaturated monomers and from 0.5 to 10% by weight, based on the total weight of monomers, of a nucleophilically substitutable α,β-unsaturated halogen compound, adding to the resulting dispersion while maintaining it at a temperature above 50° C. an alkaline agent selected from two equivalents of ammonia per equivalent of halogen and one mole of hexamethylene tetramine per mole of halogen compound, and blending a pigment paste with said dispersion to form said dispersion paint.

Claim 3

A process according to claim 1 wherein the halogen compound is added to the polymerization mixture after at least 40% and at most 80% of the other monomers have been polymerized.

Claim 4

A process according to claim 1 wherein said mono-definically unsaturated monomers are selected from the group consisting of vinyl esters of organic carboxylic acids having an acid moiety containing 1 to 30 carbon atoms, esters of acrylic acid and methacrylic acid having from 1 to 30 carbon atoms in the alchol moiety thereof, aromatic and aliphatic α,β-unsaturated hydrocarbons, vinyl halides, unsaturated nitriles, diesters of maleic acid and fumaric acid, and α,β-unsaturated carboxylic acids and amide derivatives thereof.

Claim 5

A process according to claim 1 wherein said pigment comprises less than 40% by volume of the solids content of said dispersion.

Claim 6

A process according to claim 1 wherein from 3 to 15% by weight of organic solvent is incorporated in said dispersion.

Claim 7

A process according to claim 5 and wherein said organic solvent is selected from the group consisting of polyhydric alcohols miscible with water and having up to 6 carbon atoms, monomethyl and monobutyl ethers of such polyhydric alcohols and monoglycol ethers of carboxylic acids.

Claim 8

A dispersion paint prepared by the process of claim 1.

Claim 9

A process for the manufacture of a dispersion paint having improved wet adhesion to smooth substrate surfaces comprising the steps of copolymerizing in an aqueous medium (a) one or more mono-olefinically unsaturated monomers and (b) from 0.5 to 10% by weight, based on the total weight of monomers, of an α,β-unsaturated halogen compound selected from the group consisting of chloroacetic acid vinyl ester, bromoacetic acid vinyl ester, β-chloroethyl vinyl ether, β-chloroethylacrylate and β-chloroethyl methacrylate, adding to the resulting dispersion while maintaining it at a temperature above 50° C. an alkaline agent selected from two equivalents of ammonia per equivalent of halogen and 1 mole of hexamethylene tetramine per mole of halogen compound, and blending a pigment paste with said dispersion to form said dispersion paint.

Claim 10

A process for the manufacture of a dispersion paint having improved wet adhesion to smooth substrate surfaces comprising the steps of copolymerizing in an aqueous medium (a) one or more mono-olefinically unsaturated monomers and (b) from 0.5 to 10% by weight, based on the total weight of monomers, of an α,β-unsaturated halogen compound selected from the group consisting of chloroacetic acid vinyl ester, bromoacetic acid vinyl ester, β-chloroethyl vinyl ether, β-chloroethylacrylate and β-chloroethyl methacrylate, adding to the resulting dispersion while maintaining it at a temperature above 50° C. an alkaline agent selected from two equivalents of ammonia per equivalent of halogen and 1 mole of hexamethylene tetramine per mole of halogen compound, and blending a pigment paste with said dispersion to form said dispersion paint.