Colorless grained alpha-form crystals of tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane and process for its manufacture
US5144058A · kind A · utility
1Cited by
4References
12Claims
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Key dates
| Filing date | Jun 15, 1990 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Jun 15, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane in the form of grained alpha-form crystals having improved coloration. The above compound is prepared by transesterifying low-alkyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of catalyst and aliphatic hydrocarbons as reaction solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.