Process for cleaning electronic parts or precision parts
US5522940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1994 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Nov 4, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a process for cleaning electronic parts or precision parts which comprises the steps of: washing the parts with a cleaning agent composition, rinsing the washed parts with water having a temperature of from 5.degree. to 100.degree. C., and maintaining the rinsing waste water at a temperature of 20.degree. C. or higher to effect separation of organic substances. The cleaning agent composition contains, as active cleaning components, a nonionic surface active agent and a compound selected from the group consisting of hydrocarbon compounds and slightly water soluble alkyl esters or alkyl ketones. The composition is such that 50% by weight or more of the organic substances separate from the water phase when the composition is made into an aqueous solution having an organic substance content of 5% by weight adjusted by diluting it with water or by evaporating water from it and the resulting cleaning agent aqueous solution is subsequently allowed to stand still for 30 minutes at a temperature of from 20.degree. to 100.degree. C. According to the present invention, organic substances in rinsing waste water can be separated and removed efficiently, and subsequent waste water t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.