Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1968-01-22
1983-02-01
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526169, 5261692, 526348, 526351, C08F 464, C08F 468, C08F21002
Patent
active
043716806
ABSTRACT:
A process is disclosed for the polymerization and interpolymerization of propylene, either alone or in admixture with ethylene, to produce polymers and copolymers of propylene. The catalyst employed is a coordination complex comprising at least some divalent titanium, or other transition metal element in lower valent state. The catalysts are prepared by mixing a higher valent titanium (or other transition metal) halide or titanate ester with a reducing agent, which can be any organometallic compound, such as a metal alkyl or aryl, including Grignard reagents, a metal hydride, or a metal including zinc and metals above zinc in the electromotive series. Hydrocarbon media can be employed advantageously for the preparation of the cataysts and for the polymerizations. The polymeric products (both homopolymers and copolymers) are linear and of high molecular weight and are useful as plastics, fibers and elastomers and for production of blends with polyethylene.
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Baxter Warren N.
Masukawa, administratrix by Noelle K.
Merckling, deceased Nicholas G.
Robinson Ivan M.
Stamatoff Gelu S.
E. I. du Pont de Nemours & Company
Smith Edward J.
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