Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1987-03-13
1989-07-04
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525236, 525237, 5253323, 525342, 525364, 526 82, 526 86, C08F 200, C08F 842
Patent
active
048451657
ABSTRACT:
Metals from Groups I and II and organometallic compounds thereof can be used to catalyze the polymerization of diene monomers into polymers. The polymers formed in such polymerizations are terminated with the metal used to catalyze the polymerization and are sometimes referred to as living polymers. Very useful blends of such polymers can be made by utilizing the process of the present invention. More specifically, the present invention discloses a process for preparing a polydiene rubber blend comprising: (1) polymerizing at least one diene monomer utilizing at least one catalyst selected from the group consisting of Group I metals, Group II metals, organometallic compounds containing a Group I metal, and organometallic compounds containing a Group II metal, to a conversion which is within the range of 30% to 70% to produce low molecular weight polydiene chains; (2) joining from 20% to 70% of said low molecular weight polydiene chains with a suitable branching agent; and (3) allowing the polymerization to continue so as to produce said polydiene rubber blends.
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Arconti Richard J.
Halasa Adel F.
Hsu Wen L.
Robertson-Wilcox Sylvia E.
Zanzig David J.
Briggs Sr. Wilbert J.
Rockhill Alvin T.
The Goodyear Tire & Rubber Company
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