Methods for preparing a rare-earth cis-1,4-polybutadiene...

Details Methods for preparing a rare-earth cis-1,4-polybutadiene... Methods for preparing a rare-earth cis-1,4-polybutadiene...

2007-10-30

2007-10-30

Teskin, Fred (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S128000, C526S153000, C526S164000, C526S340400, C502S107000, C502S108000, C502S117000, C502S128000, C502S132000

Reexamination Certificate

active

10949250

ABSTRACT:
Disclosed herein are a method for preparing a cis-1,4-polybutadiene with a controlled molecular weight distribution, comprising polymerizing butadiene monomers using a rare-earth catalyst system comprising:(a) at least one aliphatic hydrocarbon-soluble organometallic compound comprising at least one metal element chosen from the elements of atomic numbers 51-71 in the periodic table;(b) at least one organoaluminum compound of the formula: AlR1R22,(c) at least one aliphatic hydrocarbon-soluble halogen-containing compound;(d) optionally at least one alkylaluminum alkoxide; and(e) at least one conjugated double bond-containing organic compound, and methods of preparing the rare-earth catalyst system.

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patent: 1347923 (2002-05-01), None
patent: HEI 3-185008 (1991-08-01), None
patent: HEI 4-142308 (1992-05-01), None
Hawley's Condensed Chemical Dictionary, 14th ed., John Wiley & Sons Inc., 2002.
Copy of English language translation of Chinese Patent No. CN 1347923A; publication date: May 8, 2002.
English Derwent Abstract of CN 1347923.
English Derwent Abstract of JP Hei 3-185008.
English Derwent Abstract of JP Hei 4-142308.

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