Back to results
US 11,332,883 B2Granted
Treated Kraft pulp compositions and methods of making the same
AssigneeInternational Paper Company
InventorsMengkui Luo, Venketa Ranganathan Parthasarathy
Life of this patent
Estimating the term…
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.
Claims19
A treated Kraft pulp blend, comprising:
- a dissolving pulp;
- and
- 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 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 Kraft pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography;
- wherein the treated Kraft pulp blend comprises a gamma number of 50% or less;
- and
- wherein the treated Kraft pulp blend comprises at least 20% by weight of the treated Kraft pulp.
13 more elements
A treated Kraft pulp blend, comprising:
- 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;
- and
- a dissolving pulp;
- wherein the treated Kraft pulp has less than 8% by weight of cellulose II as determined by x-ray crystallography;
- wherein the treated Kraft pulp blend comprises a gamma number of 50% or less;
- and
- wherein the treated Kraft pulp blend comprises at least 20% by weight of the treated Kraft pulp.
8 more elements
Dependencies are inferred from the claim text.