Process for polymerizing vinyl chloride
US4145499A · kind A · utility
4Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1978 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Apr 28, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/913
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for polymerizing vinyl chloride, alone or in combination with a comonomer, in the vapor phase maintained at a pressure lower than the vapor pressure of the monomer at the polymerization temperature employed, and in the presence of the specified seed vinyl chloride polymer particles. The seed polymer particles used are prepared by polymerizing vinyl chloride, along or in combination with a comonomer, under bulk conditions, in the presence of 0.001% to 2% by weight, based on the weight of the monomer, of a cellulose ether soluble in the monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.