Antioxidant
US4278554A · kind A · utility
7Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1980 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Apr 18, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/13
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Organic material is stabilized against oxidative degradation by the addition of a small amount of an antioxidant compound or mixture of compounds containing a central segment of one to about ten divalent o-hydrocarbyl phenyl groups (e.g. o-tert-butylphenol) bonded to each other through a methylene group and having terminal 3,5-dihydrocarbyl-4-hydroxybenzyl groups at each end. They are made by first condensing o-hydrocarbyl phenol with formaldehyde and then reacting the intermediate with 2,6-dihydrocarbyl phenol and formaldehyde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.