Patent ID: 8686071

Claim:
A method of preparing a rubber composition characterized by comprising: (A) high shear mixing of a rubber composition comprised of at least one sulfur curable isoprene-containing elastomer and rubber reinforcing filler comprised of at least one of carbon black and precipitated silica in the presence of 4-hydroxy TEMPO, and subsequently: (B) thereafter blending therewith a phenol formaldehyde rubber reinforcing resin to avoid pre-reaction with the 4-hydroxy TEMPO, and thereafter (C) blending sulfur curatives together with hexamethylenetetramine therewith wherein said isoprene-containing elastomer is selected from the group consisting of at least one of natural cis 1,4-polyisoprene rubber, synthetic cis 1,4-polyisoprene rubber, styrene/isoprene/butadiene rubber and isoprene/butadiene rubber, and wherein said phenol formaldehyde resin is a preformed product of formaldehyde and phenol providing compound wherein said phenol providing compound is comprised of at least one of cashew nut shell oil, phenol, alkylated phenol, cresol and resorcinol.