Abstract: The present invention relates to a pneumatic tire with a built-in sealant layer comprised of a depolymerized butyl rubber based sealant precursor. The butyl rubber of the built-in sealant precursor composition is depolymerized in situ within the tire with an activated free radical generating organoperoxide. The organoperoxide is activated with a 2,2,6,6-tetra alkyl piperidine hindered amine. Representative of such hindered amines are, for example, a poly[[6-[1,1,3,3,-tetramethylbutyl)amino]-s-triazine-2,4-diyl][2,2,6,6,-tetramethyl-4-piperidyl)imino]hexamethylene[(2,2,6,6-tetramethyl-4-piperidyl)imino]] compound. The sealant layer, if desired, may be of a color which contrasts with black. For such purpose the sealant layer may contain a colorant of a non-black color to a substantial exclusion of carbon black.

Abstract: The present invention relates to a pneumatic tire having a rubber component comprised of (a) 100 parts by weight of at least one elastomer containing olefinic unsaturation; (b) 10 to 120 phr of carbon black; (c) 10 to 120 phr of silica; and (d) 0.1 to 10 phr of N,N?-(m-phenylene) bismaleamic acid.

Abstract: A key guide for aligning an inserted key with a keyhole includes a guide body having a guide surface that spirals from an insertion opening of the guide body to the keyhole. The spiraling surface induces rotation of the inserted key until the flat blade of the key engages a stop wall extending substantially parallel from the keyhole, where alignment between the key and the keyhole is achieved.