Patent ID: 6127292
Filing Date: 2000-10-03
Classification: C08L,E04D,Y10T

Abstract:
A coal tar impregnated reinforcement sheet comprising a layer of reinforcement which has been impregnated with a coal tar composition comprising:(1) from about 80 parts to about 98 parts by weight of coal tar having an overall float test of from about 50 seconds to about 220 seconds,(2) from about 2 parts to about 20 parts by weight of coal tar pitch having a softening point of from about 140 to about 160.degree. C., and(3) from about 1% to about 20% by weight, based on the total weight of the composition, of an acrylonitrile-butadiene copolymer, to provide a reinforcement containing at least about 100% by weight of the coal tar composition based on the weight of the unimpregnated reinforcement.