Process for preparation of perfluorinated copolymer
US4948844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for the preparation of a perfluorinated copolymer having a predetermined ratio of monomer units, which comprises copolymerizing 99.5 to 50 mole % of (I) tetrafluoroethylene with 0.5 to 50 mole % of (II) a monomer represented by the following general formula: EQU CF.sub.2 =CFOCH.sub.2 C.sub.n F.sub.l X.sub.m H.sub.(2n+1-l-m) (II) wherein X stands for --Cl or --Br, n is an integer of at least 0, l is an integer of from 0 to (2n+1), m is 0 or 1, and the relation of l+m.ltoreq.2n+1 is established, in the state where both the monomers are dissolved at a predetermined monomer ratio in an organic solvent, to thereby form a copolymer comprising units of the monomers at a ratio substantially equal to said predetermined monomer ratio, and fluorinating said copolymer with molecular fluorine. The heat resistance is highly improved in the copolymer obtained according to this process without degradation of other physical properties, and generation of hydrogen fluoride by heat is hardly caused. Since the molar ratio between the starting monomers can be substantially maintained in the formed copolymer, the composition of the copolymer can be easily controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.