Method for incorporating cellulose esters into cellulose by immersing cellulose in an acid-dope solution
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United States of America Patent
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Mar 3, 1998
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N/A
app pub date -
Sep 23, 1996
filing date -
Mar 15, 1996
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Expired
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Abstract
A method for treating cellulose with cellulose ester for use in various paper products involves reacting cellulose and an acid anhydride to form a cellulose ester-carboxylic acid solution. Acetic anhydride may be used as the acid anhydride, and a cellulose acetate-acetic acid solution may formed as the resulting cellulose ester-acetic acid solution. The cellulose acetate-acetic acid solution is diluted in a mixer, with additional acetic acid. Bulk cellulose is milled into cellulose fibers, and the diluted cellulose acetate-acetic acid solution diluted is combined with the cellulose fibers to achieve a treated fiber. Excess cellulose acetate-acetic acid solution is removed from the treated fiber and recycled to the mixer used in dilution. The treated fiber is water washed followed by removing water from the washed treated fiber. This product can then be used in paper making to produce a sheet for circuit boards, laminated products, and various paper products.
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