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US 4,284,753 AGranted
Heat curable polyepoxide-unsaturated aromatic monomer resin compositions
AssigneeShell Oil Company
InventorRalph W. Hewitt, Jr.
Life of this patent
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Abstract
Heat curable epoxy-styrene compositions exhibiting improved processability, low viscosity and long pot life, which when cured with a special acid anhydride/onium salt epoxy curing blend in combination with a free-radical catalyst, yield cured products exhibiting improved physical properties, such as increased heat deflection temperature, increased flexural strength and increased flexibility.
Claims18
A heat-curable composition comprising:
- (1) from about 50 to about 99 parts by weight of a polyepoxide possessing more than one vic-epoxy group,
- (2) from about 1 to about 50 parts by weight of an unsaturated aromatic monomer,
- (3) from about 0.25 to about 2.0 stoichiometric equivalents based on the polyepoxide of a carboxyl-containing compound,
- (4) an epoxy curing accelerator composition comprising from about 0.001 to about 10 parts by weight per 100 parts by weight of the polyepoxide of an onium compound, and
- (5) a curing amount of a free-radical curing agent.
2 more elements
Dependencies are inferred from the claim text.