Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1997-04-03
1999-05-25
Teskin, Fred
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502155, 502156, 502157, 502171, 526174, 526180, 526181, 526204, C08F 448
Patent
active
059069562
ABSTRACT:
This invention reveals an initiator system which is comprised of (a) a lithium initiator, (b) a sodium alkoxide and (c) a polar modifier; wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.05:1 to about 3:1; and wherein the molar ratio of the polar modifier to the lithium initiator is within the range of about 0.25:1 to about 5:1. The subject invention also discloses a process for preparing 3,4-polyisoprene rubber which comprises polymerizing isoprene monomer with a lithium initiator at a temperature which is within the range of about 30.degree. C. to about 100.degree. C. in the presence of a sodium alkoxide and a polar modifier, wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.05:1 to about 3:1; and wherein the molar ratio of the polar modifier to the lithium initiator is within the range of about 0.25:1 to about 5:1.
REFERENCES:
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patent: 5284927 (1994-02-01), Hsu et al.
patent: 5393721 (1995-02-01), Kitamura et al.
patent: 5620939 (1997-04-01), Halasa et al.
Hsieh et al, "Alkyllithium and Alkali Metal tert-Butoxide as Polymerization Initiator," J. Poly. Sci, A-1, 7, 449-460 (1969).
Halasa Adel Farhan
Hsu Wen-Liang
Rockhill Alvin T
Teskin Fred
The Goodyear Tire & Rubber Company
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