Crack-resistant epoxy resin molding composition with wollastonite
AssigneeCiba-Geigy Corporation
InventorBruno Schreiber
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Abstract
The invention relates to epoxy molding compositions consisting of diglycidyl ethers of bisphenols, anhydride hardeners and reinforcing fillers. At least half the total amount of filler consists of wollastonite. These molding compositions have greater resistance to cracking, which is particularly advantageous in encasing metal parts.
Claims7
An epoxy resin moulding composition consisting of an epoxy resin which contains more than 1 epoxide equivalent per kg of epoxy resin and is solid at room temperature, a solid anhydride hardener in an amount such that the number of anhydride groups per epoxy group is 1.5 to 0.5, and one or more fillers in an amount between 50 and 80% by weight, based on the moulding composition, wherein
- (a) the expoxy resin is one based on diglycidyl ethers of bisphenols,
- (b) the hardener is an anhydride of a dicarboxylic acid, and
- (c) at least half of the total amount of filler consists of wollastonite.
Dependencies are inferred from the claim text.