Process for preparing copolymers of alpha-methylstyrene and acrylonitrile
US4972032A · kind A · utility
6Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jul 19, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F257/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers of .alpha.-methylstyrene and acrylonitrile having improved composition of uniformity are prepared by emulsion polymerizing a first monomer stream having a weight ratio of .alpha.-methylstyrene/acrylonitrile from about 75/25 to about 85/15 and thereafter polymerizing a second monomer feed stream comprising acrylonitrile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.