US5736309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic support and a method of manufactring the same
Assignee: Fujifilm Holdings Corp
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Filing: 1997-07-10
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Granted: 1998-04-07
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Expires: 2017-07-10
Abstract
Abstract There is disclosed a method of manufacturing a photographic polyester film, comprising forming an unstretched film controlling; each of the temperature of the inlet of a melt extruder, at a temperature in the range from "the melting point of the polymer (Tm)"-10 DEG C. to the Tm+15 DEG C.; the temperature of the central part of a screw, at a temperature in the range from the Tm to the Tm+30 DEG C.; and the temperature of the outlet thereof, at a temperature in the range from the Tm+10 DEG C. to the Tm+35 DEG C., followed by biaxial stretching and heat-setting, and a photographic support manufactured by the method. The thus obtained photographic polyester support excels in photographic properties, adhesiveness, and mechanical strength, and that moreover hardly causes a core set curl and fog formation.
Inventors
- 👤 Fumio Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/7954; G03C2200/00; G03C2200/43; G03C2200/60; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A method of manufacturing a photographic polyester film comprising subjecting polyester pellets, whose ratio of surface area (mm 2 ) to volume (mm 3 ) is not less than 0.5, to heat treatment at a temperature in the range of from the Tg+10° C. to the Tm-20° C. and forming an unstretched film controlling; each of the temperature of the inlet of a melt extruder, in the range of from the melting point of the polyester (Tm)-10° C. to the Tm+15° C.; the temperature of the central part of a screw, in the range of from the Tm to the Tm+30° C.; and the temperature of the outlet thereof, in the range of from the Tm+10° C. to the Tm+35° C., followed by biaxially stretching and heat-setting, wherein the polyester is (i) a blend of polyethylene naphthalate and polyethylene terephthalate, or (ii) a polyester produced by polymerizing monomers consisting essentially of terephthalic acid, 2,6-naphthalene dicarboxylic acid and of ethylene glycol, wherein a molar ratio of terephthalic acid to 2,6-naphthalene dicarboxylic acid is in the range of from about 0.5:0.5 to about 0:1.0.
Claim 2
Independent Claim
182 words
A method of manufacturing a photographic polyester film comprising subjecting polyester pellets, whose ratio of surface area (mm 2 ) to volume (mm 3 ) is not less than 0.5, to heat treatment at a temperature in the range of from the Tg+10° C. to the Tm-20° C. and forming an unstretched film controlling; each of the temperature of the inlet of a melt extruder, in the range of from the melting point of the polyester (Tm)-10° C. to the Tm+15° C.; the temperature of the central part of a screw, in the range of from the Tm to the Tm+30° C.; and the temperature of the outlet thereof, in the range of from the Tm+10° C. to the Tm+35° C., followed by biaxially stretching and heat-setting, wherein the polyester is (i) a blend of polyethylene naphthalate and polyethylene terephthalate, or (ii) a polyester produced by polymerizing monomers consisting essentially of terephthalic acid, 2,6-naphthalene dicarboxylic acid and of ethylene glycol, wherein a molar ratio of terephthalic acid to 2,6-naphthalene dicarboxylic acid is in the range of from about 0.5:0.5 to about 0:1.0.
Claim 3
Dependent Claim
19 words
The method of manufacturing a photographic polyester film as claimed in claim 1, wherein said polyester is polyethylene 2,6-naphthalate.
Claim 4
Dependent Claim
38 words
The method of manufacturing a photographic polyester film as claimed in claim 1, wherein the polyester polymer, extruded and molten in the melt extruder, is passed through a filter before the polymer is formed into the unstretched film.
Claim 5
Dependent Claim
32 words
The method of manufacturing a photographic biaxially stretched polyester film as claimed in claim 1, wherein the heat treatment is carried out in vacuo or in a current of an inactive gas.
Claim 6
Dependent Claim
25 words
The method according to claim 1, wherein said heat treatment is for a period of time ranging from about 30 minutes to about 24 hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-06 | 2001-10-06 | 2002-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-06 | 2005-10-06 | 2006-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-06 | 2009-10-06 | 2010-04-07 | $7700.00 | Window Closed / Lapsed |