Process for producing conjugated diolefinic polymers

Details Process for producing conjugated diolefinic polymers Process for producing conjugated diolefinic polymers

1970-05-21

1976-04-27

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526249, 526250, 526296, 526294, 526332, 526336, 526338, 526345, 526347, 526173, C08F23616, C08F23618

Patent

active

039534090

ABSTRACT:
Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom. The above-mentioned molecular weight regulator not only displays a prominent molecular weight-regulating effect, even when used in a small amount, but also is easily commercially obtainable and inexpensive, so that marked commercial advantages can be attained according to the above-mentioned process.

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patent: 3423379 (1969-01-01), Grinninger et al.
patent: 3435011 (1969-03-01), Uraneck
patent: 3448093 (1969-06-01), Grinninger et al.
patent: 3518238 (1970-06-01), Onishi
patent: 3535296 (1970-10-01), Broering
patent: 3836513 (1974-09-01), Pyke

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