Control of metallic appearance in automotive cast paint films
US5653927A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A thermoplastic and thermoformable pigment-containing metallic automotive paint is solvent cast and dried to form a finished metallic automotive paint coat for a decorative film used in a thermoforming process to form an exterior paint layer on a molded plastic automotive body panel. The paint coat contains a pigment uniformly dispersed in a polymeric binder material preferably comprising an alloy of a polyvinylidene fluoride (PVDF) copolymer and an acrylic resin in which the PVDF copolymer is provided as a dispersion in the acrylic resin. Preferably, the dispersed form of the PVDF copolymer has a maximum particle size less than about 35 microns, and more preferably 20 microns, with a mean particle size range of 6 to 10 microns. The dispersion ratio is preferably from 80% to 20% PVDF copolymer and from 20% to 80% acrylic resin, respectively, by weight. A low molecular weight form of the PVDF copolymer is preferred and characterized by a melt viscosity of 17,000 to 20,000 poise at 230.degree. C. Reflective flakes are uniformly dispersed in the polymeric dispersion material and the dispersion form of the PVDF copolymer inhibits parallel orientation of the reflective flakes to produce…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.