Patent ID: 6350492
Filing Date: 2002-02-26
Classification: B60C,C08K

Abstract:
A method of manufacture of a carbon multi-filament reinforcing yarn encapsulated by a rubber composition comprising impregnating a multi-filament carbon yarn with a resorcinol-formaldehyde latex having a solids content ranging from 10 to 40 percent by weight and comprising on a dry weight basis(a) from 7 to 12 percent by weight of resorcinol; (b) from 2.0 to 3.0 percent by weight of formaldehyde, and the weight ratio of resorcinol to formaldehyde ranges from 2:1 to 7:1; (c) from 20 to 60 percent by weight of a vinylpyridine-styrene-butadiene terpolymer latex; (d) from 20 to 60 percent by weight of an acrylonitrile-butadiene copolymer; wherein the total percent by weight of vinylpyridine-styrene-butadiene terpolymer and acrylonitrile-butadiene copolymer ranges from 50 percent by weight to 90 percent by weight of the liquid medium in the latex; and (e) from 2.5 to 6 percent by weight of urea.