Oxolanyl cyclic acetals as anionic polymerization modifiers

Details Oxolanyl cyclic acetals as anionic polymerization modifiers Oxolanyl cyclic acetals as anionic polymerization modifiers

Filed on

1991-04-05

Date issued

1992-05-12

Examiner

Teskin, Fred

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Polymers from only ethylenic monomers or processes of...

Other Related Categories

526173, 526179, 526180, 526340, 5263402, 502156, 502157, C08F 448

Type

Patent

Status

active

Patent number

051129299

Description

ABSTRACT:
A method for preparing a diene polymer or copolymer having increased amounts of 1,2-microstructure is provided. The method involves polymerizing a diene monomer or mixture of a diene monomer and a vinyl aromatic hydrocarbon monomer in a hydrocarbon solvent in the presence of a catalytically effective amount of a catalyst composition comprising: (a) an organolithium initiator and (b) an oxolanyl cyclic acetal having the structural formula: ##STR1## wherein R is selected from the group consisting of hydrogen and alkyl groups containing from 1 to 4 carbon atoms and X is 0 or 1.

REFERENCES:
patent: 3207742 (1965-10-01), Van de Castle
patent: 3451988 (1969-06-01), Langer, Jr.
patent: 4429091 (1984-01-01), Hall
patent: 4537939 (1985-08-01), Hall et al.
patent: 4591624 (1986-05-01), Hall

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