Polyurethanes having a low friction coefficient
US6579835B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2001 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Jun 8, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/5015
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Use of fluorinated polyurethanes thermally crosslinkable for obtaining coatings having an improved friction coefficient for the dry lubrication of rubbers, plastics, metals, glass, said polyurethanes obtainable from aqueous dispersions of cationic oligourethanes having a molecular weight≦9,000, formed by:a) polyisocyanates, having NCO functionality higher than 2,b) bifunctional hydrogenated monomers,c) bifunctional hydroxylated (per)fluoropolyethers,e) monofunctional hydroxyl or carboxylic (per)fluoropolyethers or monofunctional hydroxyl (per)fluoroalkanes optionally:d) hydrogenated monomers by which it is possible to insert a crosslinkable chemical function in the oligourethane;dI) hydrogen-active compounds, able to form with the NCO functions thermolabile bonds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.