Patent ID: 7264868
Filing Date: 2007-09-04
Classification: B32B,C08C,C08K,C08L,Y10T

Abstract:
1. An article of manufacture that is comprised of a soft thermoplastic elastomer composition overmolded onto a hard substrate wherein the soft thermoplastic composition is comprised of (a) 15 to 30 parts by weight of a thermoplastic resin selected from the group consisting of polyolefin resins and polystyrene, based upon the total weight of the soft thermoplastic composition, (b) 20 to 40 parts by weight of a rubbery elastomer that is comprised of repeat units that are derived from a conjugated diene monomer selected from 1,3-butadiene and isoprene, based upon the total weight of the soft thermoplastic composition, wherein the rubbery elastomer is at least partially crosslinked, wherein the repeat units in the rubbery elastomer are distributed throughout the rubbery polymer in an essentially random manner, and wherein the rubbery polymer is a solution polymer, (c) 25 to 60 parts by weight of a highly saturated elastomer selected from the group consisting of styrene-ethylene butylene-styrene polymers, styrene-ethylene propylene-styrene polymers, hydrogenated polybutadiene, hydrogenated polyisoprene, hydrogenated styrene-isoprene random copolymers, hydrogenated styrene-butadiene random copolymers, based upon the total weight of the soft thermoplastic composition, and (d) 20 to 70 parts by weight of an oil, based upon the total weight of the soft thermoplastic composition; wherein the soft thermoplastic composition is cured with sulfur or a phenolic curative by dynamic vulcanization.