Solvent-free crystallization of pentaerythritol tetrakis-[-3-(3,5-di-tert. butyl-4-hydroxyphenyl)-propionate] and its lambda crystalline form
Abstract
Abstract Translated from German Durch Animpfen einer Schmelze von Pentaerythrit- tetrakis-[3-(3,5-ditert.-butyl-4-hydroxyphenyll-propionat] mit einer geringen Menge der kristallinen ß, δ- oder λ-Modifikation dieser Verbindung in einem Extruder, Kneter oder Innenmischer bei 70-130°C erhält man innerhalb von wenigen Minuten reines, kristallines Produkt, ohne Einsatz der bisher unbedingt erforderlichen, aber ökologisch unerwünschten Lösungsmittel. By inoculating a melt of pentaerythritol tetrakis [3- (3,5-ditert.-butyl-4-hydroxyphenyll-propionate] with a small amount of the crystalline β, δ or λ modification of this compound in an extruder, kneader or Internal mixers at 70-130 ° C produce pure, crystalline product within a few minutes, without using the previously absolutely necessary but ecologically undesirable solvents. Es wird ausserdem eine neue kristalline, thermostabile λ-Moditikation von Pentaerythrit-tetrakis-[3-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionat] beschrieben. A new crystalline, thermostable λ modification of pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] is also described.
Inventors
- 👤 Ivan Dr. Orban
- 👤 Werner Fussenegger
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