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US 3,947,522 AGranted
Epoxy resin compositions
AssigneeThe Dow Chemical Company
InventorsRalph R. Shelley, Jr., James A. Clarke
Life of this patent
Estimating the term…
Abstract
Epoxy resins modified with copolymers containing reactive groups such as -COOH are improved by vulcanizing the copolymer with an organic peroxide or sulfur. The resultant epoxy resins are useful in preparing adhesives with improved properties at elevated temperatures.
Claims25
A curable epoxy resin modified with a sulfur or organic peroxide vulcanized polymer of butadiene and acrylonitrile, methacrylonitrile or mixtures of acrylonitrile and methacrylonitrile comprising
- A. an epoxy resin having an average of more than one vicinal epoxy group and
- B. from about 0.03 to about 0.2 parts by weight per part by weight of Component (A) of unvulcanized polymer of butadiene and acrylonitrile, methacrylonitrile or mixtures of acrylonitrile and methacrylonitrile having an average molecular weight of from about 2000 to about 20,000 and containing from about 1.2 to about 5 groups per molecule of a reactive group selected from -COOH, -OH or -SH;
- wherein said unvulcanized polymer has been reacted into the molecule of the epoxy resin through the -COOH, -OH, or -SH groups and then vulcanizing said polymer with sulfur or an organic peroxide.
Dependencies are inferred from the claim text.