US4992491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ester-copolyester ether blends
Assignee: Eastman Kodak Co
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Filing: 1989-03-06
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Granted: 1991-02-12
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Expires: 2009-03-06
Abstract
Abstract A blend of a cellulose and up to 5 percent by weight of a polyesterether resin and photographic film base having improved tear strength prepared from the blend.
Inventors
- 👤 John E. Rieth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C08; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A resinous film comprising (a) greater than 0 to about 5% by weight of a polyesterether having an IV. of about 0.8 to about 1.5, a melting point above about 150° C. and being the reaction product of at least one aromatic or cycloaliphatic dicarboxylic acid having from about 8 to 12 carbon atoms and a glycol, the glycol comprising from about 75 to 96 mole percent of an aliphatic or cycloaliphatic glycol having from 8 to 12 carbon atoms, the balance being a polyether glycol having from 2 to 4 carbon atoms between ether oxygen atoms and a molecular weight of from about 200 to about 3,000 and (b) the balance being cellulose ester.
Claim 2
Dependent Claim
115 words
A resinous film comprising (a) greater than 0 to about 5% by weight of a polyesterether having an IV. of about 0.8 to about 1.5, a melting point above about 150° C. and being the reaction product of at least one aromatic or cycloaliphatic dicarboxylic acid having from about 8 to 12 carbon atoms and a glycol, the glycol comprising from about 75 to 96 mole percent of an aliphatic or cycloaliphatic glycol having from 8 to 12 carbon atoms, the balance being a polyether glycol having from 2 to 4 carbon atoms between ether oxygen atoms and a molecular weight of from about 200 to about 3,000 and (b) the balance being cellulose ester.
Claim 3
Dependent Claim
12 words
The film of claim 1 wherein the cellulose ester is cellulose acetate.
Claim 4
Dependent Claim
12 words
The blend of claim 2 wherein the cellulose acetate is cellulose triacetate.
Claim 5
Dependent Claim
22 words
The film of claim 1 wherein the polyesterether is the reaction product of 1,4-cyclohexane dicarboxylic acid, 1,4-cyclohexane dimethanol and polytetramethylene ether glycol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |