Process for polymerization of vinyl chloride
US6617408B2 · kind B2 · utility
3Cited by
14References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 25, 2001 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | May 25, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C407/003
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The dialkyl peroxydicarbonates with short alkyl chains, preferably diethyl and diisopropyl peroxydicarbonates, are used for the aqueous suspension polymerization of vinyl chloride, in the form of a solution in a dialkyl alkanedicarboxylate which is liquid and insoluble in water. The preferred solvents are hexanedicarboxylates (adipates) derived from adipic acid and from C6-C10 alkanols. The peroxydicarbonate concentration of the said solutions is generally 15-40% by weight. The process according to the invention produces vinyl chloride polymers of improved quality resulting in shaped articles exhibiting markedly fewer fisheyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.