Patent ID: 6407180
Filing Date: 2002-06-18
Classification: B29B,B29K,B29L,B60C,C08F,C08J,C08L,Y02W

Abstract:
A process for preparation of a sulfur vulcanized rubber composition which comprises:(A) homogeneously blending a pre-formed composite of particulate rubber reinforcing carbon black and tris(2-amninoethyl) amine, with a particulate, ground sulfur pre-vulcanized rubber composition, wherein said pre-formed composite has a weight ratio of said amine to carbon black in a range of about 0.1 to about 12, and in an amount of said amine to provide from about 0.18 to about 10 phr of said tris(2-aminoethyl) amine in said particulate sulfur pre-vulcanized rubber composition, and wherein said particulate sulfur pre-vulcanized rubber composition is of a particle size of less than 420 microns, to form a treated pre-vulcanized rubber composition thereof; (B) mixing about one to about 40 parts by weight of said treated pre-vulcanized rubber composition with 100 parts by weight of at least one unvulcanized rubber to form a rubber composition blend comprised of said unvulcanized rubber and said treated pre-vulcanized rubber; (C) heating said rubber composition blend for a time sufficient and at a suitable temperature to vulcanize said unvulcanized rubber composition contained therein; and wherein for said pre-formed composite, said tris(2-aminoethyl) amine is bound in a highly dispersed, dissociated form on the surface of said particulate rubber reinforcing carbon black.