Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Particular raw cellulosic materials
Reexamination Certificate
2006-08-15
2006-08-15
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Particular raw cellulosic materials
C162S090000, C162S078000, C162S065000, C162S067000
Reexamination Certificate
active
07090744
ABSTRACT:
A process for making a composition for conversion to lyocell fiber where the process comprises pulping a raw material in a digester to provide an alkaline pulp, wherein the raw material comprises sawdust in an amount greater than 0 % up to 100 %; and contacting the alkaline pulp comprising cellulose and at least about 7 % hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to within the range of from about 200 to about 1100, without substantially reducing the hemicellulose content of the pulp or substantially increasing the copper number.
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Luo Mengkui
Persinger, Jr. W. Harvey
Sealey, II James E.
Wester Brian
Christensen O'Connor Johnson & Kindness
Hug Eric
Weyerhaeuser Company
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