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US4994147A
Expired / Lapsed
US
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Photographic reflection print material with improved keeping properties
Assignee: Eastman Kodak Co
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Filing: 1990-07-25
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Granted: 1991-02-19
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Expires: 2010-07-25
Abstract
Abstract A method of making a photographic paper support having improved raw stock keeping characteristics by an internal acid sizing step and an external alkaline sizing step to achieve a water extractable pH of from 6 to 9.5.
Inventors
- 👤 Francis J. Foley
- 👤 Alberto M. Martinez
- 👤 William A. Mruk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:23
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/64; D21H17/65; D21H19/00; D21H19/10; D21H19/14; D21H19/20; D21H19/22; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
In the method of making a photographic paper support including the steps of internally sizing the aqueous pulp paper furnish with an acid sizing agent, forming the paper from the furnish, drying the paper and coating the paper on each surface with a polyolefin resin the improvement which comprises externally sizing the paper prior to application of the polyolefin coating with an aqueous alkaline medium to achieve a water extractable pH of the paper of from 6 to 9.5.
Claim 2
Dependent Claim
79 words
In the method of making a photographic paper support including the steps of internally sizing the aqueous pulp paper furnish with an acid sizing agent, forming the paper from the furnish, drying the paper and coating the paper on each surface with a polyolefin resin the improvement which comprises externally sizing the paper prior to application of the polyolefin coating with an aqueous alkaline medium to achieve a water extractable pH of the paper of from 6 to 9.5.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the paper is externally sized so that the water extracted pH is from 6.5 to 8.5.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the water extracted pH is from 7 to 8.
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein the external sizing step is conducted in-line in the steps of making the paper when the paper contains less than 10 percent by weight of water.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein the water content is less than 5 percent by weight.
Claim 7
Dependent Claim
19 words
The method of claim 4 wherein the water content is from about 2 to about 4 percent by weight.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the external sizing step is conducted off-line after the paper is formed and before it is coated.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein the pH of the aqueous pulp furnish is from 4 to 5.5.
Claim 10
Dependent Claim
18 words
The method of claim 8 wherein the pH of the aqueous pulp furnish is from 4 to 4.8.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein the pH of the aqueous pulp furnish is from 4.2 to 4.5.
Claim 12
Dependent Claim
15 words
The method of claim 1 wherein the aqueous alkaline medium is an alkali metal base.
Claim 13
Dependent Claim
14 words
The method of claim 11 wherein the alkali metal base is sodium or potassium.
Claim 14
Dependent Claim
20 words
The method of claim 11 wherein the alkali metal base is sodium bicarbonate, potassium bicarbonate, sodium hydroxide, or potassium hydroxide.
References Cited (Backward Citations)
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |