Method for preparing poly(vinyl trifluoroacetate) and poly(vinyl trifluoroacetate/vinyl ester) in the absence of chlorofluorocarbon solvent
US5336740A · kind A · utility
14Cited by
4References
39Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for the production of poly(vinyl trifluoroacetate) and copolymers thereof with vinyl esters is described. Poly(vinyl trifiuoroacetate) (PVTFA) is obtained in essentially quantitative yield under mild conditions by using non-chlorofluorocarbon solvents comprising siloxanes or perfluorinated fluids. Hexamethyl disiloxane is a particularly useful example of such solvents. Synthesis of syndiotactic PVTFA on a commercial scale without the use of environmentally-harmful solvents is made possible by the invention, which provides a convenient commercial route to syndiotactic polyvinyl alcohol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.