Base coat coating composition, composite film, and method for producing same

摘要

A base coat coating composition which is able to suppress cracking of a metal thin film, even when a tough top coat layer capable of satisfactorily protecting the metal thin film is formed on the metal thin film, and even when a heat resistance test is performed, as well as a composite film and a method for producing the composite film. Specifically, a base coat coating composition used for undercoating a metal thin film formed on a metal substrate, and containing a coating film-forming component which contains at least 30% by mass of an epoxy (meth)acrylate having a cyclic structure and has an average molecular weight between crosslinks of 180 to 1,000, as well as a composite film having a base coat layer obtained from the base coat coating composition, and a method for producing the composite film.

主权项

1. A base coat coating composition used for undercoating a metal thin film formed on a metal substrate, wherein
the base coat coating composition consists of a coating film-forming component which consists of an epoxy (meth)acrylate having a cyclic structure and an active energy beam-curable compound, a photopolymerization initiator, and a solvent, the amount of the epoxy(meth)acrylate having a cyclic structure in the coating film-forming component is 30 to 90% by mass based on a total mass of the coating film forming component, the film-forming component has an average molecular weight between crosslinks of 180 to 1,000, the epoxy (meth)acrylate having a cyclic structure is at least one compound selected from the group consisting of phenol novolac epoxy (meth)acrylates and cresol novolac epoxy (meth)acrylates, the epoxy(meth)acrylate having a cyclic structure has an average number of reactive functional groups of 6 to 6.8, and the active energy beam-curable compound has an average number of reactive functional groups of 1 to 6.