Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-10-26
1995-06-27
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 71, 525 74, 525 78, 525 86, 525 87, 525285, 525313, 525316, C08L 900, C08L 906, C08L 5302
Patent
active
054281059
ABSTRACT:
A curable polyester molding composition incorporating an elastomeric low profile additive dispersed in voided rubbery particle form throughout the composition is used in association with a compatibilizing agent to form a molded thermoset article having very smooth, light reflective, class A surfaces and having a matrix fracture energy which is comparable to articles formed from similar or identical molding compositions which are free of low profile additives. The low profile additive is an epoxidized elastomer or block copolymer having at least one flexible elastomer block and one monovinyl aromatic block. The compatibilizing agent is a copolymer having a diene polymer backbone which is compatible with the elastomer or the flexible diene block of the low profile additive, with constituents which are compatible or reactive with the polyester being grafted or adducted onto the diene polymer backbone. The compatibilizing agent improves the solubility of the low profile additive in the uncured molding composition to promote good dispersion, to promote and maintain small particle size of the low profile additive, and to enhance compatibility between the cured polyester matrix and the low profile additive, thereby providing a low profile mechanism wherein shrinkage compensation during curing of the composition occurs almost exclusively through voiding of the small tough elastomeric particles of the low profile additive dispersed in the cured polyester matrix.
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Chan-Park Mary B.
McGarry Frederick J.
GenCorp Inc.
Laferty Samuel B.
Rote, Jr. Frank C.
Rywalski Robert F.
Short Patricia A.
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