Tetrakis(3-(3,5-di-tert.buyl-4-hydroxyphenyl)propionyl-oxymethyl) methane with amorphous structure, process for its preparation and its use as a stabilizer
US4886900A · kind A · utility
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Key dates
| Filing date | Jul 17, 1987 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Jul 17, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/1345
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Tetrakis[3,5-di-tert.butyl-4-hydroxyphenyl)-propionyl-oxymethyl]methane with amorphous structure, with glass transition temperature T.sub.g comprised within the range of from about 40.degree. C. to 50.degree. C. and free from endothermic melting peaks at temperatures higher than 50.degree. C. and of up to 200.degree. C. is obtained by means of the melting of crystalline tetrakis[3-(3,5-di-tert.butyl-4-hydroxyphenul)-propionyl-oxymethyl]methane and sudden cooling of the molten material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.