Antishrinking unsaturated polyester resin composition
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United States of America Patent
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Sep 1, 1992
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N/A
app pub date -
Apr 5, 1991
filing date -
Apr 5, 1990
priority date (Note) -
Expired
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Abstract
A moldable unsaturated polyester resin composition having improved antishrinking and shape-retaining properties contains an unsaturated polyester resin/styrene mixture, fillers, glass fibers, an antishrinkage agent and a demolding agent, wherein the demolding agent is calcium montanate and wherein the antishrinkage agent is preferably a methyl methacrylate polymer. The composition is particularly useful for the manufacture of lamp reflectors having superior shape and weight retention integrity and reduced reflector surface fogging.
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