Patent ID: 7767749
Filing Date: 2010-08-03
Classification: C08J,C08K

Abstract:
1. A method of curing a rubber composition by activating a sulfur cure with a rubber soluble salt or soap provided in the composition as the salt itself or as an anionic component and a cationic component that react to form the salt in situ, the method comprising: combining uncured rubber, filler, and optionally other rubber additives exclusive of sulfur curing system and excluding the salt itself and at least the cation component of the salt in a first mixing step at temperatures up to 150° C.; adding sulfur curing components and the salt or any component omitted in the first mixing to the product of the first mixing step at a temperature not exceeding 110° C.; and subsequently curing the resulting rubber composition by heating at a temperature of approximately 130° C. or higher; wherein the resulting rubber composition comprises the anionic component at a level of 2 phr or less and the cationic component at a level of 2 phr or less, or the rubber composition comprises the salt itself at a level of 2 phr or less.