Patent ID: 6397910
Filing Date: 2002-06-04
Classification: B29D,C08K,C09J

Abstract:
In a pneumatic tire retreading process where a vulcanized rubber tire casing is obtained having an abraded peripheral surface without a tread portion, to which a cushion strip of a sulfur vulcanizable, unvulcanized rubber composition is circumferentially applied to the said abraded peripheral surface of said tire casing, and to which a pre-cured rubber tread strip, which has an unvulcanized rubber based adhesive on its inner surface, is circumferentially applied to said cushion, with said rubber based adhesive positioned between said cushion and said tread strip, to form a retreaded tire assembly and wherein the said resulting assembly is vulcanized at an elevated temperature to form a retreaded tire; an improvement wherein said adhesive is comprised of an oil rich rubber composition(i) which contains from about 150 to about 1400 phr of rubber processing oil and is exclusive of volatile organic compounds; or (ii) which contains from about 150 to about 1400 phr combination of rubber processing oil and volatile organic solvent wherein the weight ratio of said oil to said solvent is in a range of about 1/0.05 to about 1/0.66; wherein said solvent is evaporated from said adhesive layer prior to application of said pre-cured tread strip to said cushion layer.