Degreasing method using a surfactant-free composition
US6306223A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Apr 17, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S134/902
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for removing fatty substances. According to this process, the following steps are carried out:1) at least a first degreasing operation is carried out on the article to be treated, in the presence of a solvent mixture comprising at least one compound (a) chosen from C.sub.1 -C.sub.4 dialkyl esters of at least one C.sub.4 -C.sub.6 aliphatic diacid, and at least one compound (b) which is miscible in the compound (a) and which at least partially dissolves the fatty substance contaminating the article, 2) at least a second degreasing operation is optionally carried out, in the presence of a solvent mixture comprising at least one compound (a) and at least one compound (b) as defined above, with a compound (a)/compound (b) volume ratio of greater than or equal to 1, 3) a third degreasing operation is carried out in the presence of compound (a), 4) the article thus treated is rinsed with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.