Corrosion inhibiting antifreeze compositions containing various carboxylic acids
US5997763A · kind A · utility
20Cited by
28References
51Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Apr 27, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K5/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An anti-freeze concentrate made by adding together at least: PA1 a) an alkylene glycol; PA1 b) an effective corrosion inhibiting amount, or more, of an unsubstituted benzoic acid; and PA1 c) an effective corrosion inhibiting amount, or more, of a C.sub.7 -C.sub.14 monocarboxylic acid. This formulation is particularly effective at inhibiting corrosion in coolants which are free of borates, primary and secondary amines, phosphates, silicates, as well as those coolants which are free of p-tertbutyl benzoic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.