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US 11,525,215 B2Granted
Cellulose and cellulose ester film
AssigneeEastman Chemical Company
InventorsCharles Stuart Everett, Melvin Glenn Mitchell, Kenny Randolph Parker
Life of this patent
Estimating the term…
Abstract
A film is made from a wet laid product containing cellulose fibers and cellulose ester fibers and a plasticizer. The film can be made by heat pressing the wet laid sheet to form a film having a continuous phase of cellulose ester resin and a discontinuous phase of cellulose fibers.
Claims19
A wet laid film comprising:
- a. cellulose fibers, and
- b. a continuous phase obtained from solvent spun cellulose ester (CE) staple fibers that have not been surface hydrolyzed and having:
- i. a denier per filament (DPF) of 1.8 to less than 3, and
- ii. a cut length of 3 mm to less than 6 mm, and
- iii. crimping,
- c. a plasticizer,
- wherein the cellulose fibers and CE staple fibers are co-refined;
- 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.
6 more elements
A film obtained from a wet laid product, said wet laid product comprising:
- a. cellulose fibers, and
- b. solvent spun CE staple fibers that have not been surface hydrolyzed and in an amount of 4 wt % to 16 wt %, based on the weight of all the fibers in the wet laid product, and having:
- i. a denier per filament (DPF) of 1.8 to less than 3, and
- ii. a cut length of 3 mm to less than 6 mm, and
- iii. crimping,
- and
- c. a plasticizer in an amount of at least 5 wt. % based on the weight of the wet laid product;
- and
- wherein said cellulose fibers and CE staple fibers are co-refined;
- wherein said CE staple fibers comprise cellulose acetate;
- and wherein said cellulose ester staple fibers are crimped and have an average of 5 crimps per inch (CPI) or more.
8 more elements
A process for forming a semi-finished film or finished film, comprising pressing a wet laid product comprising:
- a. cellulose fibers, and
- b. solvent spun CE staple fibers that have not been surface hydrolyzed but have been co-refined with said cellulose fibers, wherein said CE staple fibers are present in the wet laid product in an amount of 4 wt % to 16 wt %, based on the weight of all the fibers in the wet laid product, and having:
- i. a denier per filament (DPF) of 1.8 to less than 3, and
- ii. a cut length of 3 mm to less than 6 mm, and
- iii. crimping,
- and
- c. a plasticizer in an amount of at least 5 wt. % wherein said CE staple fibers comprise cellulose acetate;
- and wherein said cellulose ester staple fibers are crimped and have an average of 5 crimps per inch (CPI) or more.
5 more elements
Dependencies are inferred from the claim text.