Patent ID: 7073550
Filing Date: 2006-07-11
Classification: B29C,B29D,B29L,B60C,C08K,C08L,Y10T

Abstract:
1. A pneumatic rubber tire of an open toroidal shape comprised of a tire carcass having an included cavity with a rubber innerliner layer on its inner surface within said cavity characterized by an improvement which comprises a built-in, non-black colored, puncture sealing layer covered by said rubber innerliner layer, wherein said puncture sealing layer is comprised of an organoperoxide partially depolymerized butyl rubber, wherein said puncture sealing layer contains from zero to 0.5 phr of carbon black and is comprised of, based upon parts by weight per 100 parts by weight of said partially depolymerized butyl rubber: (A) an at least partially organoperoxide-depolymerized butyl rubber wherein said butyl rubber is comprised of a copolymer of isobutylene and isoprene comprised of about 0.5 to about 5 percent units derived from isoprene; (B) particulate filler, other than carbon black, comprised of: (C) from zero to about 6 phr of short organic fibers, (D) optionally a colorant of other than a black color and in addition to said silica, flour and clay, wherein said colorant is selected from at least one of organic pigments, inorganic pigments and dyes, preferably selected from organic pigments and inorganic pigments; (E) from zero to about 20 phr of rubber processing oil, and (F) from zero to about 15 phr of liquid cis 1,4-polyisoprene polymer.