US4268539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid coating composition for forming transparent conductive films and a coating process for using said composition
Assignee: Tokyo Denshi Kagaku KK
•
Filing: 1978-11-14
•
Granted: 1981-05-19
•
Expires: 1998-11-14
Abstract
Abstract A liquid coating composition for formation of a transparent conductive film, which comprises a solution of indium nitrate in a β-diketone or a mixture of a β-diketone and another organic solvent or a reaction product of indium nitrate with a β-diketone, an activator and an organic solvent other than a β-diketone, is disclosed. When this coating composition is coated on a substrate and the coated substrate is heat-treated at a temperature higher than about 350° C., there can be obtained a transparent conductive film having excellent transparency, electrical conductivity and mechanical strength.
Inventors
- 👤 Muneo Nakayama
- 👤 Toshihiro Nishimura
- 👤 Akira Hashimoto
- 👤 Hisashi Nakane
- 👤 Teruo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5007; C04B41/5009; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/27; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/215; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/30; C03C2218/32; C03C2218/322
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
68 words
A liquid coating composition for forming a transparent conductive film, which comprises a solution of: (a) an incomplete reaction product of indium nitrate with a β-diketone in which the reaction may be allowed to proceed until a yellowish, yellow, brownish or brown color is obtained; (b) an activator for imparting a high electrical conductivity to said transparent conductive film; and (c) an organic solvent other than a β-diketone.
Claim 2
Dependent Claim
68 words
A liquid coating composition for forming a transparent conductive film, which comprises a solution of: (a) an incomplete reaction product of indium nitrate with a β-diketone in which the reaction may be allowed to proceed until a yellowish, yellow, brownish or brown color is obtained; (b) an activator for imparting a high electrical conductivity to said transparent conductive film; and (c) an organic solvent other than a β-diketone.
Claim 3
Dependent Claim
29 words
The liquid coating composition as set forth in claim 1 wherein the amount of the β-diketone is from about 2 to about 3 moles per mole of indium nitrate.
Claim 4
Dependent Claim
89 words
The liquid coating composition as set forth in claim 1 wherein the β-diketone is a compound represented by the following general formula: ##STR2## wherein R 1 , R 2 , R 3 and R 4 , which may be the same or different, are a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 1 , R 2 , R 3 and R 4 , being not a hydrogen atom, may be substituted by a halogen atom.
Claim 5
Dependent Claim
122 words
The liquid coating composition as set forth in claim 3 wherein the β-diketone is a compound represented by the following general formula: ##STR3## wherein R 1 and R 4 , which may be the same or different, are alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 1 and R 4 may be substituted by a halogen atom, and wherein R 2 and R 3 , which may be the same or different, are a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 2 and R 3 , being not a hydrogen atom, may be substituted by a halogen atom.
Claim 6
Dependent Claim
52 words
The liquid coating composition as set forth in claim 4 wherein the β-diketone is a member selected from the group consisting of acetylacetone, CH 3 COCH(CH 3 )COCH 3 , ethyl acetoacetate acetylmethylethylketone, trifluoroacetylacetone, diethyl malonate, benzoylacetone, dibenzoylmethane, benzoyltrifluoroacetone, furoylacetone, 2-furoylbenzoylmethane, 2-thenoylacetone, 2-thenoyltrifluoroacetone, malonaldehyde, 2-thenoylbenzoylmethane, bis(thenoyl)methane, 2-furoyltrifluoroacetone, hexafluoroacetylacetone, β-naphthoyitrifluoroacetone and mixtures thereof.
Claim 7
Dependent Claim
21 words
The liquid coating composition as set forth in claim 1 wherein the activator is a compound of tin, titanium or zinc.
Claim 8
Dependent Claim
20 words
The liquid coating composition as set forth in claim 6 wherein the activator is a tin nitrate or tin acetate.
Claim 9
Dependent Claim
34 words
The liquid coating composition as set forth in claim 1 wherein the organic solvent other than the β-diketone is a member selected from the group consisting of alcohols, esters, ethers, ketones and mixtures thereof.
Claim 10
Dependent Claim
54 words
The liquid coating composition as set forth in claim 8 wherein the organic solvent is a member selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, ethylene glycol, ethyl ether, isopropyl ether, dioxane, tetrahydrofuran, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, acetone, methylethylketone, methylbutylketone, cyclohexanone and mixtures thereof.
Claim 11
Dependent Claim
36 words
The liquid coating composition as set forth in claim 1 wherein the content of the total solids of the reaction product of indium nitrate with the β-diketone is from about 2 to about 20% by weight.
Claim 12
Dependent Claim
36 words
The liquid coating composition as set forth in claim 1 wherein the concentration of the activator is from about 1 to about 30% by weight based on the indium component as In 2 O 3 .
Claim 13
Dependent Claim
36 words
The liquid coating composition as set forth in claim 11 wherein the concentration of the activator is from about 3 to about 15% by weight based on the indium component as In 2 O 3 .
Claim 14
Dependent Claim
104 words
A process for forming a transparent conductive film on a substrate at room temperature, which comprises coating a substrate with liquid coating composition comprising a solution of: (a) an incomplete reaction product of indium nitrate with a β-diketone at room temperature in which the reaction may be allowed to proceed until a yellowish, yellow, brownish or brown color is obtained; (b) an activator for imparting a high electrical conductivity to said transparent conductive film; and (c) an organic solvent other than a β-diketone; and wherein said process includes a step of heat treating the coated substrate at a temperature higher than about 350° C.
Claim 15
Dependent Claim
104 words
A process for forming a transparent conductive film on a substrate at room temperature, which comprises coating a substrate with liquid coating composition comprising a solution of: (a) an incomplete reaction product of indium nitrate with a β-diketone at room temperature in which the reaction may be allowed to proceed until a yellowish, yellow, brownish or brown color is obtained; (b) an activator for imparting a high electrical conductivity to said transparent conductive film; and (c) an organic solvent other than a β-diketone; and wherein said process includes a step of heat treating the coated substrate at a temperature higher than about 350° C.
Claim 16
Dependent Claim
19 words
The coating process according to claim 13 wherein the substrate is composed of glass, ceramics, mica or heat-resistant plastics.
Claim 17
Dependent Claim
33 words
The coating process according to claim 13 wherein the coating operation is carried out according to a spinner coating method, a spray coating method, a brush coating method or a dipping draw-out method.
Claim 18
Dependent Claim
18 words
The coating process according to claim 13 wherein the heat treatment is carried out in oxygen or air.
Claim 19
Dependent Claim
21 words
The coating process according to claim 13 wherein the heat treatment is carried out in an atmosphere of an inert gas.
Claim 20
Dependent Claim
13 words
The coating process according to claim 18 wherein the inert gas is nitrogen.
Claim 21
Dependent Claim
25 words
The coating process according to claim 13 wherein the heat treatment is conducted for a time period of from about 10 to about 60 minutes.
Claim 22
Dependent Claim
25 words
A coating process according to claim 13 wherein the heat treatment is conducted at a temperature of from about 350° C. to about 1100° C.
Claim 23
Dependent Claim
37 words
The coating process according to claim 13 wherein the liquid coating composition is coated on the substrate in such an amount that the resulting coating film has a thickness of from about 0.03 to about 0.3 micron.
Claim 24
Dependent Claim
26 words
The coating process according to claim 13 wherein the amount of the β-diketone is from about 2 to about 3 moles per mole of indium nitrate.
Claim 25
Dependent Claim
86 words
The coating process according to claim 13 wherein the β-diketone is a compound represented by the following general formula: ##STR4## wherein R 1 , R 2 , R 3 and R 4 , which may be the same or different, are a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 1 , R 2 , R 3 and R 4 , being not a hydrogen atom, may be substituted by a halogen atom.
Claim 26
Dependent Claim
120 words
The coating process according to claim 23 wherein the β-diketone is a compound represented by the following general formula: ##STR5## wherein R 1 and R 4 , which may be the same or different, are an alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 1 and R 4 may be substituted by a halogen atom, and wherein R 2 and R 3 , which may be the same or different, are a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or a heterocyclic group, and at least one of R 2 and R 3 , being not a hydrogen atom, may be substituted by a halogen atom.
Claim 27
Dependent Claim
48 words
The coating process according to claim 23 wherein the β-diketone is a member selected from the group consisting of acetylacetone, CH 3 COCH(CH 3 )COCH 3 , ethyl acetoacetate, acetylmethylethylketone, trifluoroacetylacetone, diethyl malonate, benzoylacetone, dibenzoylmethane, benzoyltrifluoroacetone, furoylacetone, 2-furoylbenzoylmethane, 2-thenoylacetone, 2-thenoyltrifluoroacetone, malonaldehyde, 2-thenoylbenzoylmethane, bis(thenoyl)methane, 2-furoyltrifluoroacetone, β-naphthoyltrifluoroacetone and mixtures thereof.
Claim 28
Dependent Claim
18 words
The coating process according to claim 13 wherein the activator is a compound of tin, titanium or zinc.
Claim 29
Dependent Claim
17 words
The coating process according to claim 26 wherein the activator is a tin nitrate or tin acetate.
Claim 30
Dependent Claim
31 words
The coating process according to claim 13 wherein the organic solvent other than the β-diketone is a member selected from the group consisting of alcohols, esters, ethers, ketones and mixtures thereof.
Claim 31
Dependent Claim
51 words
The coating process according to claim 28 wherein the organic solvent is a member selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, ethylene glycol, ethyl ether, isopropyl ether, dioxane, tetrahydrofuran, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, acetone, methylethylketone, methylbutylketone, cyclohexanone and mixtures thereof.
Claim 32
Dependent Claim
33 words
The coating process according to claim 13 wherein the content of the total solids of the reaction product of indium nitrate with the β-diketone is from about 2 to about 20% by weight.
Claim 33
Dependent Claim
33 words
The coating process according to claim 13 wherein the concentration of the activator is from about 1 to about 30% by weight based on the indium component as In 2 O 3 .
Claim 34
Dependent Claim
33 words
The coating process according to claim 31 wherein the concentration of the activator is from about 3 to about 14% by weight based on the indium component as In 2 O 3 .
References Cited (Backward Citations)
US2651585A
Cited
US2694761A
Cited
US2617745A
Cited
US2849339A
Cited
US3019136A
Cited
US3202054A
Cited
US3400288A
Cited
US3666534A
Cited
US4129434A
Cited
US4147556A
Cited
US4000346A
Cited
US3925050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |