Aryl phosphonites and thiophosphonites useful as antioxidants
US4308218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1980 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | May 29, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K15/324
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aryl phosphonites and thiophosphonites of the formula, ##STR1## in which the or each R, independently, is alkyl, alkoxy, chlorine or dialkylamino, there being at the most one dialkylamino group, at the 4-position and unaccompanied by any other substituents, on the benzene nucleus, PA1 n is zero, 1, 2 or 3, PA1 each X, independently, is oxygen or sulphur, PA1 and each R.sub.1, independently, is alkyl or optionally substituted phenyl, are useful as antioxidants. Organic material, e.g. polypropylene, which are susceptible to the degradative effects of oxygen, are treated with one or more of such compounds, e.g. by incorporation into the body of the organic material, in order to be stabilized against such effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.