Linear copolymers of fluorocarbon-hydrocarbon monomers synthesized in carbon dioxide
US6730762B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 2, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Feb 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Linear copolymers of fluorocarbon and hydrocarbon monomers. The present invention provides linear copolymers and terpolymers of fluorocarbon and hydrocarbon monomers, and particularly the invention provides a linear copolymers, of fluoromonomers, such as tetrafluoroethylene, chlorotrifluoroethylene, or vinylidene fluoride, with hydrocarbon monomers, such as vinyl acetate, acrylic acid ethyl acetate or tertiary butyl acrylate. The copolymers were synthesized by polymerization by a free radical mechanism in supercritical carbon dioxide and they are linear because of synthesis in carbon dioxide. The copolymer composition was controlled by the monomer feed concentration to have between 7 and 71 mol % TFE. Additionally, new and predominantly linear co- and terpolymers were prepared by hydrolysis and trans-esterification of the latter copolymers. Furthermore, neither surfactants nor dispersing agents are required to produce the linear copolymers, but may be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.