Solvent-free crystallization of pentaerythritol tetrakis-[3-(3,5

Details Solvent-free crystallization of pentaerythritol tetrakis-[3-(3,5 Solvent-free crystallization of pentaerythritol tetrakis-[3-(3,5

1986-07-10

1987-07-28

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

C07C 6976

Patent

active

046833269

ABSTRACT:
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.degree.-130.degree. C. gives, within a few minutes, pure crystalline product without the use of a hitherto mandatory and environmentally undesirable solvent.
Also described is a novel crystalline thermostable .lambda.-modification of pentaerythritol tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

REFERENCES:
patent: 4085132 (1978-04-01), Park

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