Abstract: What is disclosed is an adhesion improved plastisol composition adaptable to use as a coating material or adhesive and comprising a finely-divided vinyl chloride polymer together with a plasticizer and filler and an adhesion improver which is (1) a condensation product formed between a polymerized fatty acid mixture having a content, X, measured in weight percent of said mixture, of tripolymeric and higher polymeric fatty acids and excess polyalkylene polyamine; (2) a product formed by reacting said condensation product (1) with an aldehyde or ketone; or (3) an adduct formed between said condensation product (1) and an epoxy compound; said adhesion improver (1), (2), or (3) having a content, Y, of imidazoline groups, expressed as a percent by weight of condensation product (1), such that the values of both X and Y are at least 40, or if the value of either X or Y is below 40 then the other value is at least 40+Z, where Z is the difference between 40 and the smaller value.