Process for preparing concentrated acrylonitrile polymer solutions
US4028302A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Oct 7, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Clear, bubble-free acrylonitrile polymer solutions of high polymer concentration are rapidly prepared by feeding powdered acrylonitrile polymer to a cool zone of a twin-screw machine and injecting solvent to form a slurry at a temperature below 40.degree. C., advancing the cool slurry to a heated zone and converting the slurry into a concentrated solution at 110.degree. to 150.degree. C. while intermittently squeezing it in directions transverse to the axes of the screws, and discharging the hot solution continuously from the machine. A zone of reduced pressure is provided to remove gases trapped in the slurry. A twin-screw machine for carrying out the process is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.