Pentaerythritol co-esters where up to 75 percent of the acid component is alkylthioalkanoic
US4794138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Aug 28, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/375
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Pentaerythritol co-esters derived from pentaerythritol, (3-alkyl-4-hydroxyphenyl)-alkanoic acids and alkylthioalkanoic acids or lower alkyl esters of such acids are useful as stabilizers of organic material normally susceptible to oxidative and/or thermal deterioration. The co-esters are advantageously prepared by transesterification of such esters with pentaerythritol. Preferred co-esters are (I) pentaerythritol tris[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]-mono[3-n-do-decylthi opropionate] and (II) pentaerythritol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]-bis[3-n-dodecylthiopr opionate]. The co-esters are especially useful in stabilizing applications for which physical mixtures of (i) (3-alkyl-4-hydroxyphenyl)alkanoic acid esters of polyols with (ii) polyalkanol esters of alkylthioalkanoic acids have heretofore been proposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.