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Process for making composition for conversion to lyocell fiber from sawdust

  • US 7,090,744 B2
  • Filed: 04/23/2002
  • Issued: 08/15/2006
  • Est. Priority Date: 08/23/1996
  • Status: Expired due to Fees
First Claim
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1. A process for making a composition for conversion to lyocell fiber, said process comprising:

  • pulping a raw material in a digester to provide an alkaline pulp, wherein the raw material comprises sawdust in an amount greater than 25% 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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