US5236818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic coatings
Assignee: Eastman Kodak Co
•
Filing: 1992-11-02
•
Granted: 1993-08-17
•
Expires: 2012-11-02
Abstract
Abstract A coating of a mixture of sodium orthosilicate together with a silica sol and a silane coupling agent provides antistatic protection when overcoated with a gelatin containing photographic construction.
Inventors
- 👤 Robert L. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/7614; G03C1/85; G03C1/853; Y; Y10; Y10S; Y10S428/00; Y10S428/922
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
49 words
A method for providing an antistatic protection layer onto a substrate comprising: a) providing a coating composition of an antistatic effective amount of a colloidal silica, alkali metal orthosilicate, and a coupling agent for said colloidal silica; b) coating said composition onto said substrate; and c) drying said composition.
Claim 2
Independent Claim
49 words
A method for providing an antistatic protection layer onto a substrate comprising: a) providing a coating composition of an antistatic effective amount of a colloidal silica, alkali metal orthosilicate, and a coupling agent for said colloidal silica; b) coating said composition onto said substrate; and c) drying said composition.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal orthosilicate is sodium orthosilicate.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein the coating composition contains a colloidal silica to sodium orthosilicate ratio of 1/1 to 8.5/1 by weight.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the coating composition contains a colloidal silica to sodium orthosilicate ratio of 1.7/1 to 3.0/1 by weight.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the colloidal silica employed is stabilized by sodium hydroxide.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the coupling agent comprises a silane coupling agent.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the coupling agent is 3-aminopropyltriethoxy silane.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein the coupling agent is 3-glycidoxypropyltrimethoxy silane.
Claim 10
Dependent Claim
25 words
The method of claim 1 wherein the percent solids of the coating composition expressed as colloidal silica plus sodium orthosilicate ranges from 0.5% to 5.0%.
Claim 11
Dependent Claim
25 words
The method of claim 9 wherein the percent solids of the coating composition expressed as colloidal silica plus sodium orthosilicate ranges from 2.0% to 4.0%.
Claim 12
Dependent Claim
18 words
The method of claim 1 in which the pH of the coating composition ranges from 10.0 to 12.0.
Claim 13
Dependent Claim
18 words
The method of claim 1 in which the pH of the coating composition is adjusted with nitric acid.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein drying of said composition forms a film having a thickness of from 25 to 1000 nm.
Claim 15
Dependent Claim
22 words
The method of claim 1 wherein drying of said composition forms a film having a thickness of from 100 to 350 nm.
Claim 16
Dependent Claim
18 words
The method of claim 1 wherein said antistatic coating of claim 1 is overcoated with a gelatin matrix.
Claim 17
Dependent Claim
19 words
The method of claim 15 wherein said gelatin matrix contains a photographic silver halide emulsion or an antihalation dye.
Claim 18
Dependent Claim
14 words
The method of claim 18 wherein the gelatin matrix contains a polyalkyl acrylate latex.
Claim 19
Dependent Claim
25 words
The method of claim 17 wherein the polyalkyl acrylate is present in a weight ratio of polyalkyl acrylate to gelatin of from 0.05/1 to 1.0/1.
Claim 20
Dependent Claim
24 words
The method of claim 19 wherein the gelatin matrix contains a photographic silver halide emulsion or an antihalation dye and a polyalkyl acrylate latex.
Claim 21
Dependent Claim
25 words
The method of claim 19 wherein the polyalkyl acrylate is present in a weight ratio of gelatin to polyalkyl acrylate of from 0.05/1 to 1.0/1.
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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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |