Patent ID: 6486259
Filing Date: 2002-11-26
Classification: C08G,C08K,C09D,Y10T

Abstract:
An ebonite tape comprising a gelled mixture having low modulus, high elongation and surface tack suitable for a plurality of tape applications, wherein the mixture is formed by first preparing separately:a) a first component comprising: i) first unsaturated polymers having first functional groups capable of reaction at ambient condition with or without a catalyst to form an elastic network, wherein the first functional groups are selected from the group consisting of hydroxyl, epoxy, acrylic, and their combinations; ii) a vulcanization activator; and iii) a sulfur vulcanization agent, wherein the mass parts of the sulfur vulcanization agent is approximately 15-50; and b) a second component comprising: i) second unsaturated polymers of mass part 50-100 having second functional groups that react with the first functional groups of the first unsaturated polymers at ambient condition, wherein the second functional groups are selected from the group consisting of isocyanate and maleic anhydride, wherein the first and second unsaturated polymers contain sufficient unsaturation in the backbones for forming linkages with the sulfur vulcanization agent, wherein the second unsaturated polymers are thermodynamically compatible with the first unsaturated polymers during a vulcanization, and wherein the first and second unsaturated polymers are selected from the group consisting of polybutadiene, polyisoprene, poly(butadiene-co-acrylonitrile), poly(isobutyl-co-isoprene), and poly(ethylene-co-propylene-co-diene); wherein the first and second components are mixed together and the mixture gels at ambient condition thereby forming said gelled mixture, and wherein molecular weight and stoichiometry of the first and second unsaturated polymers are adjustable so to achieve desired low modulus, high elongation and surface tack.