Method for preparing bagasse dissolving pulps and producing rayon having a degree of polymerization of at least 800 therefrom
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United States of America Patent
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Apr 22, 1980
Issued Date -
N/A
app pub date -
Oct 25, 1978
filing date -
Apr 19, 1976
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Expired
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Abstract
A dissolving pulp suitable for preparing rayon having a degree of polymerization of greater than about 800 can be produced using bagasse by a sodium hydroxide-sodium sulfite digestion at a ph of about 10.5 to 11.5 and preferably about 10.8 to 11.2 and a caustic-sulfite weight ratio of 1:1 to 1:3 followed by a bleaching sequence of DcEDH or DcEDD. This results in a high purity low silica content fiber which has undergone very little degradation.
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