Cleaning composition based on 1,1-dichloro-1-fluoroethane, methyl formate and methanol
US5152913A · kind A · utility
2Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Feb 7, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D7/5086
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
For replacing cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising 55 to 79.5% by weight of 1,1-dichloro-1-fluoroethane (F141b), 20 to 40% by weight of methyl formate and 0.5 to 5% of methanol. These three compounds form a positive azeotrope (b.p.=28.3.degree. C. at atmospheric pressure). The composition, which may be stabilized, can be used for cleaning solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.