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US4968554A Expired / Lapsed US ⏱️ 0.0 years remaining

Support sheet for photographic paper

Assignee: New Oji Paper Co Ltd
•
Filing: 1988-10-19
•
Granted: 1990-11-06
•
Expires: 2008-10-19
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Abstract

Abstract A support sheet for photographic paper having an enhanced resistance to curling, especially twist-curling, comprises a substrate paper sheet composed of a half stratum portion thereof at the face side of a surface on which a photographic emulsion layer will be formed and the other half stratum portion thereof at the back side of the opposite surface, and two polyolefin resin coating layers on the two surfaces of the substrate paper sheet, the substrate paper sheet having a resiliency satisfying the relationships (I) and (II): 1.5≦E.sub.fl /E.sub.bt ≦2.25 (I)= and ##EQU1## wherein E fl =a modulus of elasticity of the face side half stratum portion in the longitudinal direction of the substrate, E bt =a modulus of elasticity of the back side half stratum portion in the transverse direction of the substrate, E ft =a modulus of elasticity of the face side half stratum portion in the transverse direction of the substrate, and E bl =a modulus of elasticity of the back side half stratum portion in the longitudinal direction of the substrate.

Inventors

  • 👤 Tsunehisa Shigetani
  • 👤 Masahiro Yamana
  • 👤 Takao Ayukawa
  • 👤 Masahiro Kamiya
  • 👤 Tetsu Uesaka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 16:34
CPC Classifications
D; D21; D21F; D21F11/00; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; G03C1/81; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 63 words
A support sheet for photographic paper, comprising: a substrate paper sheet comprising a face side and a back side opposite thereto; two coating layers formed on said two sides of the substrate paper sheet which comprise polyolefin resin, and a photographic emulsion layer on one of said coating layers, wherein said substrate paper has a resilient properly satisfying the relationships (I) and (II):
Claim 2
Dependent Claim 63 words
A support sheet for photographic paper, comprising: a substrate paper sheet comprising a face side and a back side opposite thereto; two coating layers formed on said two sides of the substrate paper sheet which comprise polyolefin resin, and a photographic emulsion layer on one of said coating layers, wherein said substrate paper has a resilient properly satisfying the relationships (I) and (II):
Claim 3
Dependent Claim 102 words
5≦E fl /E bt ≦2.25 (I) and ##EQU6## wherein E fl represents the modulus of elasticity of the face side half stratum portion in the longitudinal direction of said substrate paper sheet, E bt represents the modulus of elasticity of the back side half stratum portion in the transverse direction of said substrate paper sheet, E ft represents the modulus of elasticity of the face side half stratum portion in the transverse direction of said substrate paper sheet, and E bl represents the modulus of elasticity of the back side half stratum portion in the longitudinal direction of said substrate paper sheet.
Claim 4
Dependent Claim 102 words
5≦E fl /E bt ≦2.25 (I) and ##EQU6## wherein E fl represents the modulus of elasticity of the face side half stratum portion in the longitudinal direction of said substrate paper sheet, E bt represents the modulus of elasticity of the back side half stratum portion in the transverse direction of said substrate paper sheet, E ft represents the modulus of elasticity of the face side half stratum portion in the transverse direction of said substrate paper sheet, and E bl represents the modulus of elasticity of the back side half stratum portion in the longitudinal direction of said substrate paper sheet.
Claim 5
Dependent Claim 23 words
The support sheet as claimed in claim 1, wherein the substrate paper sheet has a weight of 140 to 200 g/m 2 .
Claim 6
Dependent Claim 20 words
The support sheet as claimed in claim 1, wherein the polyolefin resin in the coating layers comprises a polyethylene resin.
Claim 7
Dependent Claim 22 words
The support sheet as claimed in claim 1, wherein each of the coating layers has a thickness of 10 to 50 μm.
Claim 8
Dependent Claim 31 words
The support sheet as claimed in claim 1, wherein the E fm and E wc in the relationships (I) and (II) are in the following ranges: 6.6GPa≦E.sub.fl ≦8.4GPa and 3.7GPa≦E.sub.bt ≦4.4GPa

References Cited (Backward Citations)

DE1772347A1 Cited
GB1269802A Cited
JPS52130626A Cited
DE2718245A1 Cited
GB1534110A Cited
JPS5596946A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-11-05 1994-05-07 1994-11-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-11-05 1998-05-07 1998-11-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-11-05 2002-05-07 2002-11-06 $7700.00 Window Closed / Lapsed

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