POLYMER DISPERSIONS AND THEIR USE IN PIGMENTED COATING COMPOSITIONS

摘要

A copolymer dispersion is described comprising a copolymer derived from a monomer mixture comprising: (a) 88.5 to 94 % by weight of at least one vinyl ester of a saturated carboxylic acid; (b) 5 to 10.5% by weight of ethylene; (c) 0.5 to 5 % by weight of at least one ethylenically unsaturated acid and/or an anhydride thereof and/or a salt thereof; and (d) 0.5 to 5 % by weight of at least one ethylenically unsaturated monomer having at least one crosslinkable functional unit. The weight ratio of vinylester units to ethylene units in the copolymer is between 89: 11 and 94:6 and the dispersion is stabilized with at least 1 % by weight of an emulsifier, wherein the amounts of monomers and emulsifier refer to the total amount of monomers in the copolymer.