CURABLE COMPOSITIONS

摘要

Rubber-toughened curable compositions have an epoxy resin containing oligomeric epoxy species and a reaction product of solid rubber and the epoxy resin. The resin has two epoxy monomeric components, on e having an epoxy functionality of greater than three and the other having an epoxy functionality of greater than one but not more tha n three. The resin is cured preferably using a combination of two curing agents, the first being capable of reacting with epoxy groups and of promoting reaction between hydroxyl and epoxy groups and the second being capable of reacting with epoxy groups. The solid rubber has reactive groups and is swellable by or soluble in a reaction mixture in which the reaction product is formed. The reaction product is formed in situ in the composition.