C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2044
C08F 297/04 (2006.01) C08G 81/02 (2006.01)
Patent
CA 1102478
COUPLED RESINOUS DIENE COPOLYMER WITH GOOD INTEGRAL HINGE FLEX LIFE AND HIGH HARDNESS Abstract of the Disclosure A conjugated diene/monovinyl-substituted aromatic compound resinous copolymer such as a styrene/butadiene block copolymer is produced using two additions of the monovinyl-substituted aromatic component and initiator in a manner such that the product has 71 to 81 wt. percent mono-vinyl-substituted aromatic component and has a ratio based on the number average molecular weight of monovinyl-substituted aromatic component blocks in first and second polymer chains thus produced prior to coupling within the range of 3 to 7. The final product resulting from coupling such polymers has long integral hinge flex life and high hardness. This is accomplished by using no more than 5 millimoles of initiator per mole of monomer in the second addition.
274950
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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