CONTROLLED SHRINKAGE ULTRAVIOLET LIGHT RESISTANT MOLDING COMPOUND
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United States of America Patent
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Issued Date -
Aug 23, 2007
app pub date -
Feb 16, 2007
filing date -
Feb 17, 2006
priority date (Note) -
Abandoned
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Abstract
A molding composition formulation is provided that includes a thermoset cross-linkable polymeric resin and an ultraviolet light absorber. A shrinkage-reducing polymeric additive is present in the formulation from between 3 and 30 total weight percent, such that upon cure a linear shrinkage rate of within .+-.1.0% is obtained. Shrinkage-reducing polymeric additives include a condensation polyester of glycol and a polyacid or acid anhydride, polyvinyl acetate, polymethylmethacrylate, or polyether polyol. A vehicle body component formed through a sheet molding composition formulation is provided as recited above, and includes a fiberglass filler. A process for producing a vehicle body component exposed to ultraviolet light upon environmental exposure of a vehicle includes molding at an elevated temperature above 20.degree. C. the vehicle component from the formulation as detailed above. The process is followed by trimming the molded vehicle component prior to assembly.
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