Transparent block copolymers

Details Transparent block copolymers Transparent block copolymers

C - Chemistry, Metallurgy

08

F

400/2043, 400/30

C08F 297/04 (2006.01) C08L 23/02 (2006.01) C08L 25/06 (2006.01) C08L 25/08 (2006.01) C08L 25/12 (2006.01) C08L 53/02 (2006.01) C08L 57/00 (2006.01)

Patent

CA 1290484

ABSTRACT Transparent linear resinous conjugated diene/monovinyl-substituted aromatic block copolymers of improved properties are prepared by forming a monovinyl- substituted aromatic homopolymer block referred to as S1, followed by forming a conjugated diene homopolymer block, referred to as B1 and linked to segment S1, followed by the formation of a conjugated diene/monovinyl-substituted aromatic random copolymer block, referred to as B/S and linked to segment B1, followed by the formation of a monovinyl-substituted aromatic homopolymer block, referred to as S2 and linked to segment B/S thereby forming the block copolymer S1-B1-B/S-S2 wherein the molecular weight of the S2 block is significantly greater than the molecular weight of the S1 block. The block copolymers obtained according to the process of the present invention are completely transparent and can be mixed with other polymers and used in a variety of applications, for example, in the manufacture of thermo- formed articles from extruded sheets.

553415

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