Raw cotton linters composition, method of making, and uses thereof
AssigneeHercules Incorporated
InventorsPaul C Gillette, Thomas G. Majewicz, Arjun C. Sau
Life of this patent
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Abstract
A composition of a loose mass of comminuted raw cotton linter fibers has a bulk density of at least 8 g/100 ml and at least 50% of the fibers in the mass passes through a US standard sieve size #10 (2 mm opening). This composition is made by obtaining a loose mass of first cut, second cut, third cut, or mill runs raw cotton linters or mixtures thereof and comminuting the loose mass of raw cotton linters to a size wherein at least 50% pass through a US standard sieve size #10 (2 mm opening). This composition is used to make cellulose ether derivatives.
Claims25
A process for making a cellulose ether derivative comprising
- a) mixing a composition comprising a loose mass of raw cut cotton linter fibers that
- i) has a bulk density of at least 20 g/100 ml and
- ii) at least 50 wt % of the fibers in the loose mass passes through a US standard sieve size #10 (2 mm opening) as a starting material with a base to form an activated cellulose mixture and,
- b) reacting the activated cellulose mixture with at least one etherifying agent to form a cellulose ether derivative product containing a cellulose ether derivative, wherein mixing power of the activated cellulose mixture is 5% lower than the mixing power of the same process using comparably comminuted purified celluloses, wherein the cutting is carried out in a rotary cutter, wherein the upper limit of cellulose content in the fibers in the cut mass of raw cotton linters is 95 wt %, wherein the molecular weight of the raw cut cotton linter fibers as determined by intrinsic viscosity (IV) has not been reduced by more than 20% relative to non-comminuted raw cotton linters, wherein the loose mass of raw cut cotton linter fibers have a number average length range of 253-541.
Dependencies are inferred from the claim text.