Fluorinated polyurethanes and polyurethane-ureas, and methods for preparing them
US5332798A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1992 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | Dec 22, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Fluorinated polyurethanes and polyurethane-ureas, of heat-processable, elastomeric type, constituted by rubber-like blocks and hard blocks, comprising segments derived from: PA0 (a) a macroglycol or polybutadiene-diol; PA0 (b) a perfluoropolyether-diol of formula EQU HO(CH.sub.2 CH.sub.2 O).sub.n --CH.sub.2 --Q--CH.sub.2 --(OCH.sub.2 CH.sub.2).sub.n OH PA0 wherein Q is a perfluoropolyether chain and "n" is comprised within the range of from 1 to 5; PA0 (c) an aromatic, aliphatic, or cycloaliphatic diisocyanate; and PA0 (d) an aliphatic, cycloaliphatic or aromatic diol or diamine, containing from 2 to 14 carbon atoms. They contain from 4 to 30% by weight of fluorine, from 10 to 60% by weight of hard components, with the molar ratio of rubber-like components (a): (b) comprised within the range of from 2 to 20. At least 80% of rubber-like segments deriving from (b) component are connected, at least at one of their sides, through a segment deriving from (c) component, with a rubber-like segment deriving from (a) component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.