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US 11,492,757 B2Granted
Composition of matter in a post-refiner blend zone
AssigneeEastman Chemical Company
InventorsCharles Stuart Everett, Melvin Glenn Mitchell, Kenny Randolph Parker, Koushik Ghosh, Mounir Izallalen
Life of this patent
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Abstract
After cellulose fibers and cellulose ester fibers are co-refined, they are fed to a blend tank continuously feeds a wet laid process. The composition in the blend tank includes co-refined cellulose fibers and cellulose ester fibers and one or more additives, and the cellulose ester fibers have a denier per filament (DPF) of less than 3, a cut length of less than 6 mm, crimped, or non-round with a DPF of less than 3.
Claims7
A process comprising adding one or more additives to a mixture in a blend tank downstream of a refiner,
- wherein the mixture comprises:
- a. cellulose fibers that are virgin, waste/recycle, or both, and cellulose ester (CE) staple fibers, that have been co-refined,
- wherein the CE staple fibers have a width of more than 1000 nm, are solvent spun and are not surface hydrolyzed, and:
- i. a DPF of 1.8 to 3.0,
- ii. a cut length of less than 6 mm,
- iii. crimped, and
- iv. non-round, and
- b. water, and
- wherein the one or more additives comprise brightening agents, dyes, pigments, fillers, retention aids, antimicrobial agents, defoamers, pH control agents, pitch control agents, internal sizing agents, dry or wet strength polymers, adhesives, retention aids, or drainage aids, or a combination thereof;
- wherein said CE staple fibers comprise cellulose acetate in an amount from about 4 wt % to less than 16 wt %;
- and wherein said cellulose ester staple fibers are crimped and have an average of 5 crimps per inch (CPI) or more.
8 more elements
Dependencies are inferred from the claim text.