Composition based on 1,1-dichloro-1-fluoroethane, 1,1,1,3,3-pentafluorobutane and methanol, for cleaning and/or drying solid surfaces
US5268120A · kind A · utility
15Cited by
13References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
To replace the cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention proposes a composition comprising, on a weight basis, 60 to 90% of 1,1-dichloro-1-fluoroethane (F141b), 9 to 33% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 1 to 7% of methanol. These three compounds form a positive azeotrope (b.p.=29.1.degree. C. at normal pressure). The composition, optionally stabilized, can be employed for the cleaning and/or drying of solid surfaces, in particular for the defluxing of printed circuits and for the degreasing of mechanical components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.