Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1975-02-27
1976-06-22
Henderson, Jr., Christopher A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
252431R, 260859R, 260880B, 260888, 526193, 526204, 526209, 526217, 526328, 526335, 526341, 526346, C08F 128, C08D 118, C08F 376
Patent
active
039650804
ABSTRACT:
Organometallic compounds of high carbanion yield are prepared by metallation with barium, strontium or calcium or mixture of the same of certain acidic organic compounds having a pKa value of between about 15 and 35 on the MSAD scale in the presence of aprotic polar solvents, e.g., barium reacted with xanthene in 1,2-dimethoxyethane to yield dixanthenyl barium. Such organometallic compounds formed by metal-hydrogen exchange reaction are useful in initiating anionic growth-type polymerization of monomers, e.g., alkylene oxides and vinyl compounds, to form homopolymers and copolymers. The persistence of polymer carbanions created by such catalysts makes possible the controlled preparation of a variety of polymers, including block copolymers.
REFERENCES:
patent: 3041312 (1962-06-01), Boyd
patent: 3509067 (1970-04-01), Bostick
patent: 3526604 (1970-09-01), Wadsworth
patent: 3548033 (1970-12-01), Bostick
Hargis Ivan Glen
Livigni Russell Anthony
Henderson, Jr. Christopher A.
The General Tire & Rubber Company
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