Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1984-04-02
1985-07-23
Henderson, Christopher A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526173, 526179, 526180, C08F 448
Patent
active
045309841
ABSTRACT:
A process and catalyst system is disclosed herein for the preparation of (co)polymers having a 1,2-microstructure ranging between about 20 and about 65 percent. These (co)polymers are prepared in a hydrocarbon or non-polar solvent from a monomer system which contains at least one 1,3-diene monomer and optionally other copolymerizable monomers. The catalyst system which is employed in the production of the (co)polymer is a combination of (1) an anionic initiator based on lithium; (2) a dialkyl magnesium compound or a trialkyl aluminum compound or a mixture thereof; and (3) a phosphine oxide modifier which is substituted with three saturated heterocyclic rings, each hetero ring containing one nitrogen atom and either four, five or six carbon atoms.
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patent: 3847883 (1974-07-01), Kamienski et al.
patent: 4139490 (1979-02-01), Halasa et al.
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Henderson Christopher A.
The Firestone Tire & Rubber & Company
Troy, Sr. Frank J.
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