Improved cleaning solvent containing non-azeotropic mixtures of 1,1,1-trichloroethane and n-propanol
US4086179A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Dec 10, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D7/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved cleaning compositions for the removal of various forms of contamination from printed circuit boards and other related electronic equipment in vapor cleaning processes are disclosed, including major amounts of 1,1,1-trichloroethane and an amount of normal propanol less than that in the true azeotropic mixture of these components, generally from about 1.0 to less than 4.75 weight percent of the normal propanol. In addition, vapor cleaning processes utilizing such solvent compositions are also disclosed, and in a preferred embodiment, the composition includes about 96.0 weight percent of the 1,1,1-trichloroethane and about 4.0 weight percent of the normal propanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.