Block copolymers of dienes, vinylarenes, and alkylmethacrylates

Details Block copolymers of dienes, vinylarenes, and alkylmethacrylates Block copolymers of dienes, vinylarenes, and alkylmethacrylates

1992-12-21

1993-12-21

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525192, 525250, 525271, 525302, 525308, 525309, 525310, 5253303, 525378, 525379, 525940, 252 56R, 252 50, C08F29702, C08F 832, C10M14514, C10M14900

Patent

active

052722112

ABSTRACT:
Polymers comprising blocks of a hydrogenated conjugated diene (B), a vinylarene (A), and an alkyl methacrylate (M), are readily prepared as a mixture of molecules having the structures B-A-M and B-A-M-A-B wherein both structures are effective as viscosity index improvers for oil compositions. Reaction of the polymers with a primary or secondary amine results in a dispersant viscosity index improver.

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