Method for producing asymmetric radial polymers

Details Method for producing asymmetric radial polymers Method for producing asymmetric radial polymers

1994-05-27

1995-09-05

Schofer, Joseph L.

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

Synthetic resins

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

525 99, 525105, 525251, 525270, 525299, C08F29704, C08G 8102

Patent

active

054479959

ABSTRACT:
A method for producing asymmetric radial polymers which comprises anionically polymerizing an anionically polymerizable monomer to form a first set of living polymer arms, coupling the first set of living polymer arms with a silicon-based coupling agent, substantially completing the coupling reaction, anionically polymerizing, in the presence of the coupled first set of polymer arms, a different anionically polymerizable monomer(s) to form a second set of living polymer arms, and adding a coupling activator and coupling the second set of living polymer arms to the coupled first set of polymer arms to form the asymmetric radial polymer.

REFERENCES:
patent: 4391949 (1983-07-01), St. Clair
patent: 4444953 (1984-04-01), St. Clair
patent: 4849481 (1989-07-01), Rhodes
patent: 4879349 (1989-11-01), Hoxmeier
patent: 4925899 (1990-05-01), Rendina
patent: 5147939 (1992-09-01), Hellermann
patent: 5212249 (1993-05-01), Richie et al.
patent: 5302667 (1994-04-01), Rhodes
patent: 5369175 (1993-11-01), Hoxmeier

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