Coupled block copolymers with improved tack for adhesives

Details Coupled block copolymers with improved tack for adhesives Coupled block copolymers with improved tack for adhesives

C - Chemistry, Metallurgy

08

F

400/1800, 400/20

C08F 297/04 (2006.01) C08G 81/02 (2006.01) C08L 53/02 (2006.01) C09J 3/14 (1980.01)

Patent

CA 1120636

Abstract of the Disclosure A monovinyl arene, such as styrene, is polymerized with n monofunc- tional lithium initiator, followed by addition of a conjugated diene, such as butadiene, with additional monofunctional lithium initiator. The resultant block copolymers are coupled to give linear coupled block copolymers or radial coupled block copolymers with a random distribution of homopolymer and co- polymer branches. The polymers exhibit increased tack and improved creep resistance in adhesive compositions. The amount of initiator added as the second increment with the second monomer must be greater than the amount added as the first increment with the first monomer.

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