Process for producing thermoplastic elastomers

Details Process for producing thermoplastic elastomers Process for producing thermoplastic elastomers

1986-02-18

1989-07-04

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525250, 525256, 525258, 525271, C08F29704

Patent

active

048451738

ABSTRACT:
A process for producing a thermoplastic elastomer comprising a block copolymer of the A-B-A' type, wherein A is a monovinyl aromatic hydrocarbon polymer block, B is a conjugated diolefin polymer block, and A' is either the same as A or a polymer block derived from a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon, which process comprises polymerizing a monovinyl aromatic hydrocarbon in a polymerization medium in the presence of an organomonolithium compound as a polymerization initiator, adding a conjugated diolefin to perform block copolymerization, and further adding a monovinyl aromatic hydrocarbon to perform polymerization or in the alternative, adding a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon to perform coupling, wherein the monomer components are used in such amounts that the weight ratio of (A+A') to B ranges from 10/90 to 65/35, and a chained aliphatic hydrocarbon solvent containing from 0.0001 to 0.1 wt % of a Lewis basic compound is used as the polymerization medium, is disclosed. According to the process of the invention, the desired thermoplastic elastomer having good physical properties is readily obtainable with high reproducibility.

REFERENCES:
patent: 3778490 (1973-12-01), Hsieh
patent: 3825623 (1974-07-01), Laflair
patent: 4054616 (1977-10-01), Miki et al.
patent: 4220738 (1980-09-01), Miki et al.
patent: 4335221 (1982-06-01), Gerberding
patent: 4346193 (1982-08-01), Warfel
patent: 4377665 (1983-03-01), Shiraki et al.
patent: 4603155 (1986-07-01), Muramori et al.

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