Patent US3847659A successfully refreshed from Google Patents.
US3847659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing plastic articles having transparent electroconductive coatings
Assignee: Teijin Ltd
•
Filing: 1972-11-07
•
Granted: 1974-11-12
•
Expires: 1992-11-07
Abstract
Abstract A method for preparing a transparent electrically conductive article which is characterized by forming a coating on the surface of a plastic material by vacuum evaporation using indic oxide as an evaporating source at a pressure lower than 5 X 10 4 mmHg while maintaining the temperature of the evaporating source at 1,300* to 2,000*C., and thereafter subjecting said coating to an oxidation treatment.
Inventors
- 👤 S Sobajima
- 👤 N Takagi
- 👤 K Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/086; C23C14/58; C23C14/5846; C23C14/5853
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A METHOD FOR PREPARING A TRANSPARENT ELECTRICALLY CONDUCTIVE ARTICLE WHICH COMPRISES FORMING A GRAY TO BLACK COLOR COATING OF LOWER OXIDES OF INDIUM ON THE SURFACE OF A PLASTIC MATERIAL BY VACUUM EVAPORATION USING INDIC OXIDE AS AN EVAPORATING SOURCE AT A PRESSURE LOWER THAN 5 X 10**4MMHG WHILE MAINTAINING THE TEMPERATURE OF THE EVAPORATING SOURCE AT 1,300* TO 2,000*C. AND THEREAFTER OXIDIZING SAID COATING UNTIL THE COATING BECOMES TRANSPARENT SO THAT THE TRANSMITTANCE OF 600 NONAMETERS LIGHT THROUGH THE COATING REACHES TO 60 TO 95 PERCENT.
Claim 2
Independent Claim
87 words
A METHOD FOR PREPARING A TRANSPARENT ELECTRICALLY CONDUCTIVE ARTICLE WHICH COMPRISES FORMING A GRAY TO BLACK COLOR COATING OF LOWER OXIDES OF INDIUM ON THE SURFACE OF A PLASTIC MATERIAL BY VACUUM EVAPORATION USING INDIC OXIDE AS AN EVAPORATING SOURCE AT A PRESSURE LOWER THAN 5 X 10**4MMHG WHILE MAINTAINING THE TEMPERATURE OF THE EVAPORATING SOURCE AT 1,300* TO 2,000*C. AND THEREAFTER OXIDIZING SAID COATING UNTIL THE COATING BECOMES TRANSPARENT SO THAT THE TRANSMITTANCE OF 600 NONAMETERS LIGHT THROUGH THE COATING REACHES TO 60 TO 95 PERCENT.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the temperature of the evaporating source is 1,450* to 1,800*C.
Claim 4
Dependent Claim
51 words
The method of claim 1 wherein said oxidation treatment comprises heating the coating formed by vacuum evaporation in an atmosphere of air or a gas containing at least 15 percent by volume of oxygen at a temperature of 80* to 250*C. but lower than the heat-resistance temperature of the plastic material.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein the coating has a thickness of 300 to 2000 A.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein said oxidation treatment comprises subjecting the coating formed by vacuum evaporation to anodic oxidation in a liquid medium having a specific conductivity of from 10 10 ohm 1 cm 1 to 10 2 ohm 1 cm 1.
Claim 7
Dependent Claim
28 words
The method of claim 5 wherein the liquid medium has a specific conductivity of from 10 9 ohm 1 cm 1 to 10 3 ohm 1 cm 1.
Claim 8
Dependent Claim
15 words
The method of claim 6 wherein the liquid medium is dimethyl sulfoxide or dimethyl formamide.
Claim 9
Dependent Claim
39 words
The method of claim 1 wherein said oxidation treatment comprises contacting the coating formed by vacuum evaporation with an aqueous solution having a pH within the range of 1 to 13 containing at least one inorganic chemical oxidizing agent.
Claim 10
Dependent Claim
17 words
The method of claim 8 wherein said inorganic chemical oxidizing agent is a permanganate, bichromate or persulfate.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein said aqueous solution has a pH within the range of 2 to 12.
Claim 12
Dependent Claim
54 words
The method of claim 1 wherein the coating which has been subjected to oxidation is then contacted with a chlorinating agent at about room temperature for about 3 seconds to about 30 minutes, said chlorinating agent being selected from the group consisting of chlorine, hydrogen chloride, nitrogen oxychloride, diluted hydrochloric acid or aqua regia.
Claim 13
Dependent Claim
31 words
The method of claim 1 wherein said evaporating source consists of at least 80 percent by weight of indic oxide and the remainder being tin oxide or lower oxides of indium.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said plastic material is a film or sheet.
Claim 15
Dependent Claim
12 words
The method of claim 1 wherein said plastic material is a polyester.
Claim 16
Dependent Claim
52 words
The method of claim 1 wherein the plastic material is a polyester film, wherein at least 80 mol percent of the recurring units of said polyester consists of polyethylene-2,6-naphthalene dicarboxylate; said film having been biaxially stretched wherein the draw ratio in each of the transverse and longitudinal directions is at least 2.
References Cited (Backward Citations)
US3356529A
Cited
US3400014A
Cited
US3458342A
Cited
US3505092A
Cited
US3695910A
Cited
US3749658A
Cited
US3756847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |