Process for preparing low bulk viscosity polymers

Details Process for preparing low bulk viscosity polymers Process for preparing low bulk viscosity polymers

1973-12-28

1976-01-13

Holler, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08F 206, C08F 414, C08F 452, C08F 3604

Patent

active

039323714

ABSTRACT:
Polymerization reactions may be carried out in a solvent at a temperature which is above its lower critical solution temperature thereby resulting in a two-phase system comprising a solvent phase containing dissolved therein monomers and low molecular weight fractions of polymer and dispersed fluid phase comprising a solution of solvent in the higher molecular weight fraction of polymer being formed.
This process technique is particularly advantageous in the preparation of low molecular weight isoolefin conjugated diolefin copolymers. In particular, propane has been found to be an ideal solvent for the isoolefin conjugated diolefin polymerization processes.
The use of this type of polymerization process results in a low viscosity system having excellent heat transfer and low fouling characteristics.

REFERENCES:
patent: 3382224 (1968-05-01), Wood
patent: 3402164 (1968-09-01), Miyoshi et al.
patent: 3553156 (1971-01-01), Anolick et al.
patent: 3562804 (1971-02-01), Powers
Olah, Friedel-Crafts and Related Reactions, Vol. I, Interscience, N.Y., N.Y. (1963), pp. 249-253.

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