COATING COMPOSITIONS FOR ADHESION TO OLEFINIC SUBSTRATES

摘要

The composition contains a chlorinated polyolefin and an olefin-based block copolymer that has an olefin block that is substantially saturated and at least one (poly)ester or (poly)ether block. The olefin-based block copolymer can be prepared by reacting an hydroxyl-functional, saturated or substantial ly saturated olefin polymer with a chain-extension reagent that is reactive wit h hydroxyl groups and will polymerize in a head-to-tail arrangement of monomer units. The composition can be an adhesion promoter that provides excellent adhesion of subsequent coating layers to olefinic substrates like TPO or an additive in a curable coating composition, especially a primer composition, to provide excellent adhesion to olefinic substrates like TPO, even when used i n very minor amounts compared to the amounts required for previously known agents.