Super-halogenated unsaturated polyesters and process for their manufacture
US3979368A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1973 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Sep 28, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S260/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Super-halogenated unsaturated polyesters having average molecular weights of between 300 and 3,000, comprising units derived from at least one .alpha.-epihalohydrin and from maleic anhydride and optionally from another cyclic organic anhydride, possessing a halogen content arising from super-halogenation of between 1 and 35% by weight and the process for their manufacture which is characterized in that maleic anhydride, alone or mixed with another cyclic organic anhydride, is copolymerized with at least one .alpha.-epihalohydrin in molar ratios of epihalohydrin to anhydride(s) of between 1:1 and 2:1, in the presence of a titanium tetrahalide, the halogen being preferably chosen from the group consisting of chlorine and bromine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.