Process for preparing low bulk viscosity polymers
US3932371A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1973 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Dec 28, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F36/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.