Method for producing vinyl chloride polymers
US4258165A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1979 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Apr 12, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F214/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a vinyl chloride resin comprising 10 to 80% by weight of tetrahydrofuran-insoluble vinyl chloride resin gel fraction and the balance of tetrahydrofuran-soluble fraction with an average polymerization degree of 1,000 or more, characterized in that vinyl chloride alone or a mixture of a major amount of vinyl chloride and a minor amount of at least one monomer copolymerizable therewith is polymerized at a temperature of 0.degree. to 50.degree. C. in the presence of at least one polyfunctional monomer having two or more ethylenic double bonds in the molecule until the whole monomer or monomers in the polymerization system are substantially polymerized. The thus obtained vinyl chloride resin is excellent in processability and capable of forming a molded article having a small compression permanent set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.