Compositions based on 1,1,1,3,3-pentafluorobutane and methanol for the cleaning and/or drying of solid surfaces
US5268121A · kind A · utility
24Cited by
7References
11Claims
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 cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention proposes a composition comprising, by weight, 93 to 99% of 1,1,1,3,3-pentafluorobutane (F365 mfc) and 7 to 1% of methanol. These two compounds form a positive azeotrope (b.p.=36.5.degree. C. at normal pressure). The composition, optionally stabilized, can be used for the cleaning and/or drying of solid surfaces, in particular for the removal of flux from printed circuits and for degreasing mechanical parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.