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US 4,072,804 AGranted
Cross-linkable epoxy resin casting compounds
AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Kleeberg, Heinz Hacker, Klaus-Robert Hauschildt
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AssigneeSiemens Aktiengesellschaft
InventorsWolfgang Kleeberg, Heinz Hacker, Klaus-Robert Hauschildt
Estimating the term…
The invention provides epoxy resin casting compounds based on polyepoxides, polycarboxylic acids and/or polycarboxylic acid anhydrides with directly or latently present carboxyl functions, which can be converted by polyaddition and/or polymerization into insoluble and unmeltable cross-linked polymers. According to the invention, the carboxyl functions are replaced, at least partially, by maleic acid monoallyl ester and a polymerization-initiating radical former, the maleic acid monoallyl ester component being present in the reaction mixture in free form and/or in the form of adducts to the polyepoxide. The epoxy resin casting compounds constitute systems which can be processed in a wide temperature range and are cross-linked rapidly at elevated temperature.
An epoxy casting composition capable of being converted to insoluble and unmeltable crosslinked polymers by polyaddition and polymerization comprising a mixture of a polyepoxide, a polycarboxyl-containing compound selected from the group consisting of a polycarboxylic acid, a polycarboxylic acid anhydride and mixtures thereof, a polymerization-initiating radical former, and maleic acid monoallyl ester, said ester being present in said mixture as:
Dependencies are inferred from the claim text.