Cellulose ester having improved stability to wet heat

Details Cellulose ester having improved stability to wet heat Cellulose ester having improved stability to wet heat

2011-01-04

2011-01-04

Jiang, Shaojia Anna (Department: 1623)

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

Organic compounds

Carbohydrates or derivatives

C536S069000, C428S532000, C106S162100, C106S168010

Reexamination Certificate

active

07863439

ABSTRACT:
The present invention provides a cellulose ester in which heat resistance under wet condition is compatible with both releasability and spinnability even when the amount of the residual solvent is small in a casting process. The cellulose ester fulfills the following formula:in-line-formulae description="In-line Formulae" end="lead"?0.5<(B)/(A)<1.5in-line-formulae description="In-line Formulae" end="tail"?wherein (A) and (B) represent the total amount (in terms of molar amount) of residual sulfuric acid in 1 gram of the cellulose ester and the total amount (in terms of molar amount) of calcium contained in 1 gram of the cellulose ester, respectively.

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Cellulose Commun. vol. 5, No. 2 (1998), pp. 101-104.

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