Composition based on 1,1,1,3,3-pentafluorobutane, methylene chloride and methanol, for the cleaning and/or drying of solid surfaces
US5350534A · kind A · utility
13Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Jul 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D7/28
- WIPO fieldBasic materials 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 69% 1,1,1,3,3-pentafluorobutane (F365-mfc), 30 to 60% methylene chloride and 1 to 10% methanol. These three compounds form a positive azeotrope (B.p.=32.1.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.