Patent ID: 6386255
Filing Date: 2002-05-14
Classification: B29C,B29L,C08K,Y10T

Abstract:
A tire repair patch for application to a surface of an off-the-road tire at an injured portion having a through hole, said patch comprising a first gum rubber composition and optionally a second gum rubber composition, an uncured ply package of at least two overlapping plies of reinforcing cords either coated with rubber or partially or fully embedded in said first or second gum rubber composition said ply package remaining uncured until said patch is cured after assembly into said tire injured portion, an unvulcanized base cushion gum layer at the underside of said patch for engagement with said surface of said tire, an unvulcanized top cushion gum layer at the opposite side of the patch from said underside, wherein at least said base and top cushion gum layers comprise said first gum rubber composition, said first gum rubber composition including from about 0.1 to about 5 phr of a bis-imide compound of the formula where R1, R2, R3, and R4 are independently hydrogen, an alkyl group of 1 to 5 carbon atoms, an alkylphenyl group having 7 to 10 carbon atoms or a halogen substituted alkyl group having from 1 to 5 carbon atoms, a halogen substituted phenyl group, or a halogen substituted alkylphenylene group having a total of from 7 to 10 carbon atoms, and where X is an alkylene group having from 1 to 5 carbon atoms, a phenylene group, an alkylphenylene or alkylenephenyl group having 7 to 10 carbon atoms, an oligomer of alkylene and phenylene groups having from 7 to 30 carbon atoms, or a halogen substituted alkylene group having from 1 to 5 carbon atoms, a halogen substituted phenylene group, or a halogen substituted alkylphenylene or alkylenephenyl group having a total of from 7 to 10 carbon atoms.