Retarded anionic polymerization of vinyl aromatic monomers...

Details Retarded anionic polymerization of vinyl aromatic monomers... Retarded anionic polymerization of vinyl aromatic monomers...

2008-04-01

2008-04-01

Teskin, Fred (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S065000, C526S173000, C526S177000, C526S183000, C526S185000, C525S053000

Reexamination Certificate

active

07351777

ABSTRACT:
This invention is a process to manufacture high quality vinyl aromatic polymer that is essentially free of unreacted vinyl aromatic monomer using retarded anionic polymerization wherein the retardant is insoluble and can be removed from the polymerization at an intermediate stage so that the polymerization can be carried to completion in the absence of the retardant.

REFERENCES:
patent: 4614729 (1986-09-01), Crawford et al.
patent: 6300441 (2001-10-01), Schade et al.
patent: 6303721 (2001-10-01), Latsch et al.
patent: 6444762 (2002-09-01), Fischer et al.

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