METHOD OF MAKING CELLULOSE ESTER POLYMER AND PRE-TREATING CELLULOSE FOR THE MANUFACTURE OF CELLULOSE ESTER POLYMER
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United States of America Patent
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Issued Date -
Mar 20, 2008
app pub date -
Dec 4, 2006
filing date -
Sep 19, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of making cellulose ester polymer comprises the steps of: pre-treating a cellulose source; esterifying the pretreated cellulose source to form a cellulose ester; and optionally hydrolyzing the cellulose ester. The pretreatment step further comprises: mixing, in a first stage, the cellulose source with a first solution of a weak acid and water, whereby the cellulose source being suspended in the first solution; de-liquefying the first stage suspension; mixing, in a second stage, the de-liquefied mass with a second solution of weak acid and water, whereby the mass being suspended in the second solution; and de-liquefying the second stage suspension.
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