US4348238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ester film
Assignee: Eastman Kodak Co
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Filing: 1980-06-26
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Granted: 1982-09-07
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Expires: 2000-06-26
Abstract
Abstract Incorporation of a polyethoxylated phosphate ester in a film-forming composition containing a cellulose ester dissolved in a solvent medium has been found to promote stripping of the film from the surface on which it is cast. Such use of polyethoxylated phosphate esters as stripping aids is especially advantageous in the manufacture of cellulose ester film base in the photographic industry.
Inventors
- 👤 Harry J. Krall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08L; C08L1/00; C08L1/08; C08L1/10; C08L101/00; C08L71/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
70 words
In a method for the manufacture of a cellulose ester film in which a film-forming composition comprising a cellulose ester disolved in a solvent is cast upon a smooth surface, said solvent is partially evaporated, and said composition is stripped from said surface in the form of a film, the improvement comprising incorporating in said composition a polyethoxylated phosphate ester in an amount sufficient to promote stripping of said film.
Claim 2
Dependent Claim
70 words
In a method for the manufacture of a cellulose ester film in which a film-forming composition comprising a cellulose ester disolved in a solvent is cast upon a smooth surface, said solvent is partially evaporated, and said composition is stripped from said surface in the form of a film, the improvement comprising incorporating in said composition a polyethoxylated phosphate ester in an amount sufficient to promote stripping of said film.
Claim 3
Dependent Claim
57 words
A method as claimed in claim 1 wherein said polyethoxylated phosphate ester has the formula: ##STR4## wherein R is a hydrocarbyl radical, n is an integer of from 1 to 100, M is hydrogen, ammonium, an alkali metal or an amino radical, and X is an --OM group or an R--O--(CH 2 --CH 2 --O) n --group.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 2 wherein R is an alkyl radical of 1 to 12 carbon atoms.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 2 wherein R is an ##STR5## in which R' is an alkyl radical of 1 to 8 carbon atoms.
Claim 6
Dependent Claim
33 words
A method as claimed in claim 1 wherein said polyethoxylated phosphate ester is employed in an amount of from about 0.001 to about 0.01 parts per part by weight of said cellulose ester.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 wherein said casting surface is a chromium-plated surface of a casting wheel.
Claim 8
Dependent Claim
34 words
A method as claimed in claim 1 wherein said cellulose ester is selected from the group consisting of cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate and cellulose propionate butyrate.
Claim 9
Dependent Claim
11 words
A film comprising a cellulose ester and a polyethoxylated phosphate ester.
Claim 10
Dependent Claim
11 words
A film comprising a cellulose ester and a polyethoxylated phosphate ester.
Claim 11
Dependent Claim
11 words
A film as claimed in claim 8 additionally comprising a plasticizer.
Claim 12
Dependent Claim
34 words
A film as claimed in claim 8 wherein said cellulose ester is selected from the group consisting of cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate and cellulose propionate butyrate.
Claim 13
Dependent Claim
57 words
A film as claimed in claim 8 wherein said polyethoxylated phosphate ester has the formula: ##STR6## wherein R is a hydrocarbyl radical, n is a integer of from 1 to 100, M is hydrogen, ammonium, an alkali metal or an amino radical, and X is an --OM group or an R--O--(CH 2 --CH 2 --O) n --group.
Claim 14
Dependent Claim
25 words
A film as claimed in claim 11 wherein R is an ##STR7## in which R' is an alkyl radical of 1 to 8 carbon atoms.
Claim 15
Dependent Claim
33 words
A film as claimed in claim 8 wherein said polyethoxylated phosphate ester is present in an amount of from about 0.001 to about 0.01 parts per part by weight of said cellulose ester.
Claim 16
Dependent Claim
13 words
A film as claimed in claim 9 wherein said plasticizer is triphenyl phosphate.
Claim 17
Dependent Claim
18 words
A film as claimed in claim 9 wherein said plasticizer is a mixture of triphenyl phosphate and di-(2-methoxyethyl)phthalate.
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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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |