Solvent cleaning agents including additives of the formula R.sub.f -CFX-L containing perfluoroalkylenic units
US6020298A · kind A · utility
5Cited by
10References
2Claims
0Family size
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Key dates
| Filing date | May 4, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 4, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D7/5018
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Use of solvents capable of removing oily substances without solubilizing them, consisting of hydrofluoropolyethers having the general formula EQU HF.sub.2 CO(CF.sub.2 O).sub.n (CF.sub.2 CF.sub.2 O).sub.m CF.sub.2 H wherein n and m are integers comprised between 0 and 20, excluding when m and n are contemporaneously 0, and having boiling point from 30.degree. to 200.degree. C. and having a molar ratio 0/C comprised between 0.5-1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.