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US 2020/0063353 A1Published application
Cellulose and cellulose ester film
AssigneeEastman Chemical Company
InventorsCharles Stuart Everett, Melvin Glenn Mitchell, Kenny Randolph Parker
Life of this patent
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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.
Claims20
A wet laid film comprising:
- a. cellulose polymer, and
- b. a continuous phase obtained from cellulose ester (CE) staple fibers having:
- i. denier per filament (DPF) of less than 3, or
- ii. a cut length of less than 6 mm, or
- iii. crimping, or
- iv. a combination of any two or more of (i)-(iii).
3 more elements
A film obtained from a wet laid product, said wet laid product comprising:
- a. cellulose fibers, and
- b. CE staple fibers in an amount of 25 wt % to 85 wt. %, based on the weight of all the fibers in the wet laid product, and having:
- i. a denier per filament (DPF) of less than 3, or
- ii. a cut length of less than 6 mm, or
- iii. crimping, or
- iv. a combination of any two or more of (i)-(iii);
- 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.
7 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. CE staple fibers in an amount of 25 wt. % to 85 wt. %, based on the weight of all the fibers in the wet laid product, and having:
- i. a denier per filament (DPF) of less than 3, or
- ii. a cut length of less than 6 mm, or
- iii. crimping, or
- iv. a combination of any two or more of (i)-(iii), and
- c. plasticizer in an amount of at least 5 wt. %.
4 more elements
Dependencies are inferred from the claim text.