Title: Process for preparing low bulk viscosity polymers

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.

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Inventors: Powers, Kenneth W. (Berkeley Heights, NJ, US)

Application Number: 429129
Filing Date: 1973-12-28
Publication_date: 1976-01-13
Assignee: Exxon Research and Engineering Company (Linden, NJ)
Primary Class(es): 526/70 526/86, 526/189, 526/206, 526/236, 526/339
Other Classes:
US Patent Ref:

3382224	May, 1968	Wood	260/85.
3402164	Sep, 1968	Miyoshi et al.	260/85.
3553156	Jan, 1971	Anolick et al.	260/85.
3562804	Feb, 1971	Powers	260/85.

Other Refs: 567,414

Dec, 1958	CA

Other References: Olah, Friedel-Crafts and Related Reactions, Vol. I, Interscience, N.Y., N.Y. (1963), pp. 249-253.