Patent ID: 6555601
Filing Date: 2003-04-29
Classification: C08K,C08L,H01B,H01F

Abstract:
A curable epoxy resin composition which is solid at room temperature and comprises the following constituents:(a) an epoxy resin which is solid at room temperature, selected from (a1) polyglycidyl ethers based on novolaks; (a2) diglycidyl ethers based on bisphenols, and (a3) mixtures of more than one of components (a1) and (a2); (b) a crosslinking agent for component (a) selected from: (b1) dicyandiamide, (b2) polycarboxylic anhydrides and (b3) mixtures of more than one of components (b1) and/or (b2) and/or one or more polyphenols; (c) a suitable accelerator for the reaction of component (a) and component (b); d) from 15 to 70 percent by weight, based on the overall weight of the composition, of filler selected from (d1) calcium carbonate, (d2) quartz flour, (d3) wollastonite whose particles have an average ratio of length to cross-section which is less than 5:1; (d4) mixtures of components (d1), (d2) and (d3) and (d5) mixtures of components (d1), (d2), (d3) and (d4) with other inorganic fillers; and also (e) from 10 to 60-percent by weight, based on the overall weight of the composition, of inorganic reinforcements in the form of acicular or fibrillar particles with a length of from above 0.15 to 2.5 mm which have an average ratio of length to cross-section of 5:1 or more, the overall amount of component (d) and (e) being not more than 80 percent by weight, based on the overall weight of the composition.