Dry primer film composite and use thereof

摘要

A dry primer film composite that includes a release carrier film and a pigmented sandable primer layer having a dry film thickness of 100 μm or greater overlying the carrier film, wherein the primer layer is a latent heat curing material; and uses of the dry primer film composite for spot repair of a substrate in need of repair. In preferred embodiments said primer layer is formed from a coating composition comprising a binder chosen from thermosetting acrylics, GMA acrylics, urethanes, epoxies, polyester and combinations thereof.

主权项

1. A method for spot repair of a substrate, comprising the step of applying a dry primer film composite to the substrate, the dry primer film composite comprising:
a release carrier film; a pigmented sandable primer layer having a dry film thickness (DFT) of about 100 microns (μm) or greater overlying the carrier film; andwherein the primer layer is a thermally self cross-linking latent heat curing material having a latent curing temperature in the range from 100° C. to 140° C. and having a melt/flow temperature in the range from 75° C. up to its latent curing temperature, and further wherein the primer layer is formed from a coating composition comprising a binder system chosen from: (i) an epoxy-amine system based on epoxy homopolymerization with a tertiary amine catalyst; (ii) a hybrid epoxy-polyester system based on epoxy reaction with an acid terminated polyester; (iii) a polyester system based on acid terminated polyester reaction with triglycidyl isocyanurate (TGIC); (iv) a GMA acrylic system based on GMA acrylics reaction with acid; (v) a urethane system based on hydroxyl terminated polyesters; (vi) a urethane system based on acrylics reaction with malonate blocked isocyanates; (vii) a hybrid thermoplastic urethane and thermosetting urethane, wherein the thermosetting urethane is a type chosen from groups (v) or (vi) above; or (viii) combinations of any of the above systems.