Method of making mixed pentaerythritol esters having up to 75 pe

Details Method of making mixed pentaerythritol esters having up to 75 pe Method of making mixed pentaerythritol esters having up to 75 pe

1987-10-19

1989-02-21

Anderson, Harold D.

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

Organic compounds

Carboxylic acid esters

560 59, 524289, C07C14920

Patent

active

048066753

ABSTRACT:
Pentaerythritol co-esters derived from pentaerythritol, (3-alkyl-4-hydroxyphenyl)-alkanoic acids and alkylthioalkanoic acids or lower alkyl esters of such acids are useful as stabilizers of organic material normally susceptible to oxidative and/or thermal deterioration. The co-esters are advantageously prepared by transesterification of such esters with pentaerythritol. Preferred co-esters are (I) pentaerythritol tris[3,5-di-tert-butyl-4-hydroxyphenyl)propionate]-mono[3-n-dodecylthiopro pionate] and (II) pentaerythritol bis[-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]-bis[3-n-dodecylthiopro pionate]. The co-esters are especially useful in stabilizing applications for which physical mixtures of (i) (3-alkyl-4-hydroxyphenylalkanoic acid esters of polyols with (ii) polyalkanol esters of alkylthioalkanoic acids have heretofore been proposed.

REFERENCES:
patent: 3275597 (1966-09-01), Mauz et al.
patent: 3758549 (1973-09-01), Dexter et al.

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