Process for manufacture of pentaerythritol diphosphites

Details Process for manufacture of pentaerythritol diphosphites Process for manufacture of pentaerythritol diphosphites

2008-03-11

2008-03-11

Anderson, Rebecca (Department: 1626)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C558S078000, C568S012000

Reexamination Certificate

active

07342060

ABSTRACT:
A method is disclosed for the production of pentaerythritol diphosphites of high spiro isomer content. The pentaerythritol diphosphites are produced via sequential transesterification of pentaerythritol with a monophosphite followed by a substituted phenol or other alcohol, wherein the transesterification reactions are carried out under controlled conditions of temperature and pressure. The unique reaction conditions result in intermediate and final pentaerythritol diphosphites of high spiro isomer content and high total yield of the diphosphites.

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patent: 6657032 (2003-12-01), Vanderbilt
patent: WO 03/102004 (2003-12-01), None

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