Thermoplastic polyesters containing perfluoropolyoxyalkylene sequence
US5476910A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/672
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Fluorinated thermoplastic elastomers having a block structure: EQU --[--R.sub.f --H.sub.1 --H.sub.2 --H.sub.1 --]-- where --R.sub.f -- is a perfluoropolyoxyalkylene sequence of formula: EQU --CF.sub.2 O--(CF.sub.2 CF.sub.2 O).sub.m --(CF.sub.2 O).sub.n --CF.sub.2 -- with m/n=0.2.div.5, H.sub.1 and H.sub.2, equal or different from each other, are bivalent radicals having arylene, alkylarylene, alkylene or cycloalkylene structure, optionally containing fluorine and/or other heteroatoms selected among oxygen, sulphur, nitrogen. Such products are obtainable by utilizing a perfluoropolyoxyalkylene diol having a functionality at least equal to 1.97, preferably at least equal to 1.99, and are characterized by a tensile strength at 23.degree. C. at least 50% higher than that of the corresponding polyesters obtained starting from perfluoropolyoxyalkylene diols having a functionality not higher than 1.96.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.