In-mold coating of sheet molding compound moldings

Details In-mold coating of sheet molding compound moldings In-mold coating of sheet molding compound moldings

B - Operations, Transporting

29

C

18/911

B29C 37/00 (2006.01) C09D 4/00 (2006.01) B29C 43/00 (2006.01)

Patent

CA 1127817

GT-1181 IN-MOLD COATING OF SHEET MOLDING COMPOUND MOLDINGS Abstract of the Disclosure Liquid compositions suitable for hot post-mold coating of cured sheet molding compound (SMC) parts com- prise a reaction product of an epoxide and an unsaturated carboxylic acid mixed with a low shrink additive and a filler having a sheet-like structure. These liquid com- positions are used to smooth surfaces, fill porosity and other voids and to eliminate or reduce sink marks. Coatings typically are cured in less than two minutes and appear able to provide many features of normal paint- ing without paint facilities except possibly those needed for touch-up. The application method used to date has been to compression mold an SMC part in the usual way, separate the mold halves, inject the liquid composition and re- close the mold for a second cure cycle. A unique feature of the liquid composition is its ability to adhere to an uncleaned SMC molding.

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