Patent ID: 6248826
Filing Date: 2001-06-19
Classification: C01P,C08F

Abstract:
An aqueous dispersion of a copolymer formed by aqueous emulsion polymerization of a monomer mixture comprising:a) from 0.1 to 20% by weight of one or more terminally unsaturated oligomers of the formula: ##STR8##wherein N is a residue of the formula: ##STR9##wherein M is the residue of an ethylenically unsaturated monomer;wherein said N and M residues are randomly arranged in said oligomer;wherein m is the total number of M residues in said oligomer and is in the range 0 to 47;wherein n is the total number of N residues in said oligomer and is in the range 2 to 140; andwherein the sum of n and m is in the range from 3 to 150;b) from 80 to 99.9% by weight of at least two monomers selected from the group consisting of esters of acrylic and methacrylic acid with alcohol containing from 1 to 24 carbons, amides of acrylic and methacrylic acid, vinyl esters of carboxylic acids containing from 1 to 20 carbons, vinyl-aromatic compounds containing compounds containing up to 20 carbons, ethylenically unsaturated nitrites containing from 3 to 6 carbons, vinyl halides, and non-aromatic hydrocarbons containing from 2 to 8 carbons and at least one olefinic double bond; andc) from 0 to 10% by weight of other copolymerizable monomers;wherein said aqueous emulsion polymerization is performed in the presence of an anionic emulsifier at a pH less than 4.