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US 2023/0142284 A1Published application
Treated kraft pulp compositions and methods of making the same
AssigneeInternational Paper Company
InventorsMENGKUI LUO, VENKETA PANGANATHAN PARTHASARATHY
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Abstract
Compositions including treated Kraft pulp, useful for making rayon fibers, having a lower degree of polymerization, a high R18, a low hemicellulose content, and high reactivity, are described. Methods of making the compositions are also described.
Claims21
A treated Kraft pulp, comprising:
- a hemicellulose content of 5% or more;
- a R18 value of 88% or more;
- and
- at least one reactivity value selected from:
- a standard reactivity of 3.5 mL or more,
- a modified reactivity of 30 mL or more,
- a gamma number of 60% or less,
- a filter value Kr of 10,000 or less,
- a SEM fiber segment count of 11 or less per 100 µm2 of a filter when the pulp is subjected to a modified reactivity test, and a crystallite cross-section of less than 20.6 nm2;
- wherein the treated pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography;
- and
- wherein the treated Kraft pulp is treated chemical wood pulp.
9 more elements
(canceled)
19-20. (canceled)
A treated Kraft pulp, comprising:
- a hemicellulose content of 5% or more;
- a R18 value of 88% or more;
- and a gamma number of 60% or less;
- wherein the treated pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography;
- and
- wherein the treated Kraft pulp is treated chemical wood pulp.
3 more elements
Dependencies are inferred from the claim text.