US4456549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paste for formation of transparent electroconductive coating film and process for preparation of said paste
Assignee: Alps Alpine Co Ltd
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Filing: 1982-09-30
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Granted: 1984-06-26
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Expires: 2002-09-30
Abstract
Abstract Disclosed is a paste for formation of a transparent electroconductive coating film, which comprises as a main component an organic indium complex having an oxygen atom coordinated directly to the indium atom, which is capable of forming an indium oxide film by sintering, such as trisacetylacetonatoindium (III). This paste provides a coating film having a low resistivity and a high transparency by screen printing and sintering, and has a good stability and a long pot life. If an organic tin compound such as tin octylate, dibutyl tin dilaurate or tetraacetylacetonatotin is incorporated as a resistivity-adjusting agent into this paste in an amount such that the Sn/(In+Sn) atomic ratio is 2 to 20%, especially good results are obtained. A cellulose derivative such as ethyl cellulose, nitrocellulose, acetyl cellulose or benzyl cellulose is advantageously incorporated as a viscosity builder into the paste.
Inventors
- 👤 Mitsuru Kano
- 👤 Jun Nakanowatari
- 👤 Yoshimi Kamijyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:46
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/24; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A paste for the formation of a transparent electroconductive coating film by screen printing comprising an organic indium complex having an oxygen atom directly coordinated to the indium atom, said complex being capable of forming an indium oxide film by sintering, an organic tin compound capable of forming a tin oxide film by sintering in an amount such that the Sn to (In+Sn) atomic ratio is 2 to 20%, an organic viscosity builder capable of complete thermal decomposition at a temperature lower than 500° C. and selected from the group consisting of ethyl cellulose, nitrocellulose, acetyl cellulose and benzyl cellulose and an inert organic solvent.
Claim 2
Dependent Claim
105 words
A paste for the formation of a transparent electroconductive coating film by screen printing comprising an organic indium complex having an oxygen atom directly coordinated to the indium atom, said complex being capable of forming an indium oxide film by sintering, an organic tin compound capable of forming a tin oxide film by sintering in an amount such that the Sn to (In+Sn) atomic ratio is 2 to 20%, an organic viscosity builder capable of complete thermal decomposition at a temperature lower than 500° C. and selected from the group consisting of ethyl cellulose, nitrocellulose, acetyl cellulose and benzyl cellulose and an inert organic solvent.
Claim 3
Dependent Claim
13 words
A paste as in claim 1 wherein the indium complex is trisacetylacetonatoindium (III).
Claim 4
Dependent Claim
19 words
A paste as in claim 1 wherein the organic tin compound is tin octylate, dibutyl tin laurate or tetraacetylacetonatin.
Claim 5
Dependent Claim
19 words
A paste as in claim 2 wherein the organic tin compound is tin octylate, dibutyl tin laurate or tetraacetylacetonatin.
Claim 6
Dependent Claim
17 words
A paste as in claim 1 wherein the organic tin compound is dibutyl tin laurate or tetraacetylacetonatin.
Claim 7
Dependent Claim
17 words
A paste as in claim 3 wherein the organic tin compound is dibutyl tin laurate or tetraacetylacetonatin.
Claim 8
Dependent Claim
21 words
A paste as in claim 1 wherein the viscosity builder is nitrocellulose having a viscosity of from 1/4 to 120 seconds.
Claim 9
Dependent Claim
21 words
A paste as in claim 2 wherein the viscosity builder is nitrocellulose having a viscosity of from 1/4 to 120 seconds.
Claim 10
Dependent Claim
24 words
A paste as in claim 7 wherein the nitrocellulose content is 11 to 20% by weight based on the total weight of the paste.
Claim 11
Dependent Claim
24 words
A paste as in claim 8 wherein the nitrocellulose content is 11 to 20% by weight based on the total weight of the paste.
Claim 12
Dependent Claim
163 words
A process for the production of a paste for the formation of a transparent electroconductive coating film by screen printing which comprises the steps of: 1. adding to an inert organic solvent an organic indium complex having an oxygen atom directly coordinated to the indium atom, said complex being capable of forming an indium oxide film by sintering, said organic solvent having a vapor pressure below 1 mm Hg at normal temperatures and a boiling point of 180° C. to 350° C., 2. adding acetylacetone, 3. heating the mixture to dissolve the complex and remove the acetylacetone, 4. adding a viscosity builder capable of complete thermal composition at a temperature lower than 500° C. and selected from the group consisting of ethyl cellulose, nitrocellulose, acetyl cellulose or benzyl cellulose and 5. adding and mixing therein an organic tin compound capable of forming a tin oxide film by sintering in an amount such that the Sn to (In+Sn) atomic ratio is 2 to 20%.
Claim 13
Dependent Claim
163 words
A process for the production of a paste for the formation of a transparent electroconductive coating film by screen printing which comprises the steps of: 1. adding to an inert organic solvent an organic indium complex having an oxygen atom directly coordinated to the indium atom, said complex being capable of forming an indium oxide film by sintering, said organic solvent having a vapor pressure below 1 mm Hg at normal temperatures and a boiling point of 180° C. to 350° C., 2. adding acetylacetone, 3. heating the mixture to dissolve the complex and remove the acetylacetone, 4. adding a viscosity builder capable of complete thermal composition at a temperature lower than 500° C. and selected from the group consisting of ethyl cellulose, nitrocellulose, acetyl cellulose or benzyl cellulose and 5. adding and mixing therein an organic tin compound capable of forming a tin oxide film by sintering in an amount such that the Sn to (In+Sn) atomic ratio is 2 to 20%.
Claim 14
Dependent Claim
21 words
A method as in claim 11 wherein the viscosity builder is nitrocellulose having a viscosity of from 1/4 to 20 seconds.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |