Composition based on 1,1,1,3,3-pentafluorobutane and methylene chloride, for the cleaning and/or drying of solid surfaces
US5348681A · kind A · utility
15Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Jul 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G5/02803
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
To replace cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising, by weight, 30 to 70% 1,1,1,3,3-pentafluorobutane (F365-mfc) and 70 to 30% methylene chloride. These two compounds form a positive azeotrope (B.p.=33.6.degree. C. at normal pressure). The composition, optionally stabilized, can be used for the cleaning and/or the drying of solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.