Polyvinyl acetal resin, use thereof as an adhesion promoting additive, method of producing same, and adhesive composition comprising same

摘要

An acrylate- or methacrylate-substituted polyvinyl acetal resin of formula I:- wherein the weight percentages of the X, Y and Z groups are variable, R is a hydrogen atom or a alkyl group, and R1 is a hydrogen atom or a methyl group, is described. The resin of formula I is produced by acrylating or methacrylating a polyvinyl acetal resin of formula II:- in which the weight percentages of the X min , Y min and Z min groups are variable, particularly in the range 68 to 88% X min , 6 to 19% Y min and 1 to 26% Z. The compounds of formula I are used to promote adhesion of acrylate or methacrylate ester based adhesive compositions to polyester plastic substrates.