Patent ID: 9034776
Filing Date: 2015-05-19
Classification: C08J,E04C,Y10T

Abstract:
1. Method of producing an elastic composite material comprising the step of a) impregnating a fiber fabric with a liquid epoxy system formed by mixing a non-aromatic epoxy diglycidyl ether resin selected from 1,6-hexanediol diglycidyl ether, 1,4-butanediol diglycidyl ether and 1,4-cyclohexanediol diglycidyl ether and one cycloaliphatic polyamine compound hardener having a viscosity of 300-400 mPa·s measured at 25° C. at a resin/hardener ratio in parts by weight of 100/67 to 100/96; b) and curing the impregnated fabric, characterized in that the epoxy system exhibits a viscosity less than 170 mPa·s measured at 25° C. and a tensile modulus lower than 15 MPa when cured and an onset of the glass transition temperature Tg at a temperature lower than 0° C. and the elastic composite material comprises 20 to 80 vol % of fibers, based on the total volume of the composite and exhibits a flexural modulus lower than 15 GPa.