| 摘要 |
The purpose of the present invention is to provide novel primer compositions for use in bonding a thermoset polyurethane film to the surface of a polymeric substrate. The novel primer composition of the invention is an elastomeric polymer, particularly polyvinylpyrrolidinone, or a copolymer comprising vinylpyrrolidinone and butyl acrylate. The construction of the article of the present invention comprises a transparent polymeric substrate, such as stretched acrylic, a primer layer of polyvinylpyrrolidinone or copolymer of vinylpyrrolidinone and butyl acrylate on a surface thereof, and a film of thermoset polyurethane on the primer layer. The polyurethane is preferably a reaction product of isocyanate and a polyol such as hexanediol carbonate polyol, cyclohexanedimethanol carbonate polyol, phthalate ester polyol, and hexanediol/cyclohexanedimethanol carbonate polyol. The effect of the primer composition of the present invention is to provide adequate adhesion of the thermoset polyurethane film to the polymeric substrate, such as stretched acrylic. The resulting article is particularly useful as an aircraft cabin window. |
