Aqueous compositions containing urea as a hydrotrope
US4488989A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1983 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Nov 14, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/2093
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous composition, particularly a liquid detergent composition comprising urea as a hydrotrope, of improved storage stability which further comprises certain esters, e.g., methyl and ethyl lactates which hydrolyze at a rate comparable to that of the hydrolysis of urea to ultimately form ammonium salts whereby said detergent composition is maintained at a stable overall pH level. In an alternative, competing, but nonetheless beneficial mode of operation the ammonia generated by the hydrolysis of urea may react directly with the esters of the invention by ammonolysis. The acid from which said ester is derived has a pK.sub.a in the range of about 2 to about 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.