High unsaturation butyl rubbers

Details High unsaturation butyl rubbers High unsaturation butyl rubbers

1977-04-18

1979-04-24

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526337, 526339, C08F23206, C08F21012

Patent

active

041513436

ABSTRACT:
Substantially gel-free, high unsaturation copolymers of isoolefin and diolefin and high unsaturation terpolymers of isoolefin, acyclic diene and cyclic diene having a number average molecular weight of at least about 90,000 and a mole percent of unsaturation of at least 5% and the process for preparing said polymers which comprises carrying out the polymerization in a homogeneous phase, introducing to the system either an aluminum halide in a soluble form or a hydrocarbylaluminum dihalide and carrying the reaction out at a temperature of less than about -100.degree. C.

REFERENCES:
patent: 2521359 (1950-09-01), Garber
patent: 3080337 (1963-03-01), Minckler et al.
patent: 3808177 (1974-04-01), Thaler et al.
patent: 3928297 (1975-12-01), Thaler et al.

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