Refrigerating machine oil
US5804096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Aug 16, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2210/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A first refrigerating machine oil of the present invention has a sodium and/or potassium concentration of not higher than 0.1 ppm. Since it has low hydrolyzability and excellent insulating properties, the first refrigerating machine oil is useful as a refrigerating machine oil composition for refrigerators having a hermetic compressor. A second refrigerating machine oil of the present invention is composed mainly of an ester of pentaerythritol and a carboxylic acid. The carboxylic acid is a mixed carboxylic acid composed of 3,5,5-trimethylhexanoic acid and a straight-chain or branched fatty acid having from 6 to 8 carbon atoms. The proportion of 3,5,5-trimethylhexanoic acid in the mixed carboxylic acid is in the range of from more than 50 mol % to not more than 90 mol %. The second refrigerating machine oil has high viscosity and high electrical insulating properties, which are required for refrigerating machine oils as used for large-sized air conditioning equipment and room air conditioners, and is non-crystallizable at low temperature and hence superior in handleability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.