Thermoplastic elastomers having isobutylene block and cyclized d

Details Thermoplastic elastomers having isobutylene block and cyclized d Thermoplastic elastomers having isobutylene block and cyclized d

1988-06-17

1990-03-20

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...

525319, 525270, 5253323, 525371, 522126, C08F29700

Patent

active

049102613

ABSTRACT:
A polymerization process for preparing triblock copolymers and multiblock copolymers. The process includes the polymerization of isobutylene below about -40.degree. C. in a reaction mixture which includes a titanium halide, a mixed solvent, and an initiator compound selected from the group consisting of cumyl ester and cumyl ether compounds. In at least some instances, the components are added in a particular order, sometimes together with a moisture scavenger. After formation of the polyisobutylene, a diene is added to the mixture containing the polyisobutylene and polymerized to form the desired copolymer. The diene portion of the copolymer may subsequently be cyclized to produce a copolymer exhibiting both thermoplastic and elastomeric properties. If desired the block copolymers can be subsequently modified to include functional side groups, or to provide photocuring capabilities.

REFERENCES:
patent: 4248986 (1981-02-01), Lai et al.
patent: 4480075 (1984-10-01), Willis
patent: 4631249 (1986-12-01), Kalyanaraman
patent: 4782122 (1988-11-01), Dean

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