Solvent-free crystallisation of pentaerythritol...

Details Solvent-free crystallisation of pentaerythritol... Solvent-free crystallisation of pentaerythritol...

C - Chemistry, Metallurgy

07

C

260/478.3, 260/4

C07C 69/732 (2006.01) C07C 67/52 (2006.01)

Patent

CA 1254905

Solvent-free cystallisation of pentaerythritol tetrakis-[3-(3,5- di-tert-butyl-4-hydroxyphenyl)propionate] and the novel .lambda.-crystalline form thereof Abstract of the Disclosure Seeding a melt of pentaerythritol tetrakis-[3-(3,5-di- tert-butyl-4-hydroxyphenyl)propionate] with a small amount of the crystalline .beta.-, .delta.- or .lambda.-modification of this compound in an extruder, kneader or internal mixer at 70°-130°C gives, within a few minutes, pure crystalline product without the use of a hiterto mandatory and environmentally undesirable solvent. Also described is a novel crystalline thermostable .lambda.-modification of pentaerythritol tetrakis-[3-(3,5-di-tert-butyl-4-hydroxy- phenyl)propionate]. This compound is known as an excellent antioxidant for organic material.

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