Precipitation polymerization of copolymers of a vinyl lactam and a polymerizable carboxylic acid using sub-surface feeding
US5011895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Jun 4, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F226/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
What is described herein is an improved precipitation polymerization process and copolymer products produced thereby. The process herein is carried out by charging a reactor with a solvent in which the copolymer product is substantially insoluble over the entire compositional range of the copolymer, preferably heptane or cyclohexane, and a polymerization initiator, heating to 50.degree. to 150.degree. C., agitating, and then simultaneously feeding selected amounts of a vinyl lactam and a polymerizable carboxylic acid into said reactor below the surface of the solvent while continuing to agitate the mixture to precipitate the copolymer from solution as a fine, white powder, and recovering the copolymer of defined composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.