Phenolic antioxidants in crystalline form

Details Phenolic antioxidants in crystalline form Phenolic antioxidants in crystalline form

2007-08-28

2007-08-28

McKenzie, Thomas (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C252S182310, C252S397000, C514S419000

Reexamination Certificate

active

10534513

ABSTRACT:
The invention relates to a process for preparing solid particles of a phenolic antioxidant from the IRGANOX series in the form of crystals, particularly IRGANOX 1010 and 1098, the crystal particles obtainable by the process, the further processing of the crystal particles, an aqueous dispersion comprising the phenolic antioxidant, novel crystal modifications of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] (μ-form) and N,N′-hexane-1,6diyl-bis[3-(3,5-di-tert-butyl-4-hydroxypheylpropamide)] (β-form) and aqueous dispersion comprising the new crystal modifications.

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