US4895688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a support for photographic paper
Assignee: New Oji Paper Co Ltd
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Filing: 1988-10-24
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Granted: 1990-01-23
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Expires: 2008-10-24
Abstract
Abstract A support for photographic paper is produced by a method including the steps of coating one or two surfaces of a substrate sheet with a resinous melt includes a water-proof thermoplastic polymer and a pigment, by a melt-extrude-coating method, and solidifying the coating layer of the resinous melt on the substrate sheet, and wherein at least one melt-kneading procedure is applied to the resinous melt in a melt extruder having a pair of biaxial screws engaged with each other and satisfying the relationship (i) L≧20D (I) wherein L is a length of the screws and D is a diameter of the screws, and provided with at least one pair of kneading disks located in at least a portion of the screws.
Inventors
- 👤 Tsunehisa Shigetani
- 👤 Masahiro Kamiya
- 👤 Tatsuo Miyakoda
- 👤 Katsuhiko Sakata
- 👤 Toshio Inada
- 👤 Tatsumi Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/40; B29C48/402; B29C48/50; B29C48/505; B29C48/63; B29C48/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A method of producing a support for photographic paper, comprising the steps of: preparing a resinous melt from a resinous material comprising a water proof thermoplastic polymer and a pigment and continuously coating at least one surface of a substrate sheet with the resinous melt by a melt-extrude-coating procedure; and solidifying the resultant coating layer of the resinous melt on the substrate sheet, wherein the resinous melt to be coated on the surface of the substrate sheet contains at least a portion thereof to which at least one melt-kneading procedure is applied in a melt extruder having a pair of biaxial screws engaged with each other, satisfying the relationship (I): L≧20D (I) wherein L represents a length of each screw and D represents a diameter of each screw, and provided with at least one pair of kneading disks located in at least a portion of the biaxial screws.
Claim 2
Independent Claim
148 words
A method of producing a support for photographic paper, comprising the steps of: preparing a resinous melt from a resinous material comprising a water proof thermoplastic polymer and a pigment and continuously coating at least one surface of a substrate sheet with the resinous melt by a melt-extrude-coating procedure; and solidifying the resultant coating layer of the resinous melt on the substrate sheet, wherein the resinous melt to be coated on the surface of the substrate sheet contains at least a portion thereof to which at least one melt-kneading procedure is applied in a melt extruder having a pair of biaxial screws engaged with each other, satisfying the relationship (I): L≧20D (I) wherein L represents a length of each screw and D represents a diameter of each screw, and provided with at least one pair of kneading disks located in at least a portion of the biaxial screws.
Claim 3
Dependent Claim
39 words
The method as claimed in claim 1, wherein the melt extruder further comprises with at least one pair of sealing disks arranged on at least a portion of the biaxial screws and located immediately downstream of the kneading disks.
Claim 4
Dependent Claim
31 words
The method as claimed in claim 1, wherein the kneading disks on each screw have a total thickness T satisfying the relationship (II): 2D≦T≦10D (II) wherein D is as defined above.
Claim 5
Dependent Claim
13 words
The method as claimed in claim 1, wherein the substrate sheet comprises paper.
Claim 6
Dependent Claim
15 words
The method as claimed in claim 1, wherein the water-proof thermoplastic polymer comprises polyolefin polymers.
Claim 7
Dependent Claim
14 words
The method as claimed in claim 5, wherein the polyolefin polymer comprises polyethylene polymers.
Claim 8
Dependent Claim
15 words
The method as claimed in claim 1, wherein the pigment consists essentially of titanium dioxide.
Claim 9
Dependent Claim
40 words
The method as claimed in claim 1, wherein the melt extruder further comprises at least one pair of opposite threaded spiral ridges arranged on at least a portion of the biaxial screws and located immediately downstream of the kneading disks.
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |