Conversion of polymer solutions into solids or more viscous solution
US4412028A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1981 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Dec 29, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for forming a gel having improved creep resistance at elevated temperatures and having a viscosity of at least about 100,000 cps which includes the steps forming a solvent system of an organic liquid and a water miscible cosolvent, the water miscible cosolvent being less than about 15 wt. % of the solvent system, a viscosity of the solvent system being less than about 1000 cps; dissolving a neutralized sulfonated polymer in the solvent system to form a solution, adding a free radical generating initiator to the solution at a concentration level of about 0.01 to about 1%, a concentration of the neutralized sulfonated polymer in the solution being about 0.5 to about 20 wt. %, a viscosity of the solution being less than about 20,000 cps; and adding under shear conditions about 5 to about 500 vol. % water to the solution having a viscosity less than about 20,000 cps, the water being immiscible with the solution and the water miscible cosolvent transferring from the solution phase to the water phase thereby causing the viscosity of said solution to increase from less than 20,000 cps to greater than 100,000 cps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.