US4353958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green ceramic tapes and method of producing them
Assignee: KOA SOAP Co Ltd
•
Filing: 1980-03-20
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Granted: 1982-10-12
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Expires: 2000-03-20
Abstract
Abstract Green ceramic tapes are prepared which comprise a finely divided ceramic powder and a water-compatible polyurethane resin binder. The green tapes are prepared by casting a water-based slip containing the ceramic powder and the water-compatible polyurethane resin binder in the form of the tape and then drying the formed tape. The drying is preferably conducted in two stages, in the first of which a relatively humid atmosphere is maintained.
Inventors
- 👤 Katsuhiko Kita
- 👤 Junzo Fukuda
- 👤 Hidemasa Ohmura
- 👤 Takeya Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; C04B35/63456; C04B33/00; C04B33/02; C04B33/13; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
A green ceramic tape, comprising: a fine ceramic powder and a water-compatible polyurethane binder in a solvent selected from the group consisting of water and mixtures of water with water soluble organic solvents, said binder being present in a proportion of 2 to 15 parts by weight per 100 parts by weight of said ceramic powder.
Claim 2
Dependent Claim
56 words
A green ceramic tape, comprising: a fine ceramic powder and a water-compatible polyurethane binder in a solvent selected from the group consisting of water and mixtures of water with water soluble organic solvents, said binder being present in a proportion of 2 to 15 parts by weight per 100 parts by weight of said ceramic powder.
Claim 3
Dependent Claim
30 words
The ceramic green tape of claim 1, wherein said binder is present in the proportion of about 7 parts by weight per 100 parts by weight of said ceramic powder.
Claim 4
Dependent Claim
19 words
The green ceramic tape of claim 1, wherein said water soluble organic solvent is ethyl alcohol or ethylene glycol.
Claim 5
Dependent Claim
65 words
A slip for preparing a green ceramic tape, said slip comprising 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of a dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the composition with a viscosity suitable for forming a green ceramic tape.
Claim 6
Dependent Claim
65 words
A slip for preparing a green ceramic tape, said slip comprising 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of a dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the composition with a viscosity suitable for forming a green ceramic tape.
Claim 7
Dependent Claim
22 words
The slip of claim 4, wherein said water-compatible polyurethane resin binder is present in an amount of about 7 parts by weight.
Claim 8
Dependent Claim
11 words
The slip of claim 4, wherein said dispersing agent is non-ionic.
Claim 9
Dependent Claim
25 words
The slip of claim 4, wherein said dispersing agent has an ionic charge of the same polarity as that of said water-compatible polyurethane resin binder.
Claim 10
Dependent Claim
20 words
The slip of claim 4, wherein said dispersing agent is present in an amount of about 1 part by weight.
Claim 11
Independent Claim
71 words
A method of producing a slip for forming a green ceramic tape comprising milling a mixture comprising 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of a dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the mixture with a viscosity suitable for forming a green ceramic tape.
Claim 12
Independent Claim
71 words
A method of producing a slip for forming a green ceramic tape comprising milling a mixture comprising 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of a dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the mixture with a viscosity suitable for forming a green ceramic tape.
Claim 13
Dependent Claim
22 words
The method of claim 9, wherein said water-compatible polyurethane resin binder is present in an amount of about 7 parts by weight.
Claim 14
Dependent Claim
14 words
The method of claim 9, wherein said dispersing agent is a non-ionic dispersing agent.
Claim 15
Dependent Claim
25 words
The method of claim 9, wherein said dispersing agent has an ionic charge which is the same as that of said water-compatible polyurethane resin binder.
Claim 16
Dependent Claim
19 words
The method of claim 9, wherein said dispersing agent is present in an amount of 1 part by weight.
Claim 17
Dependent Claim
14 words
The method of claim 9, wherein said milling is conducted in a ball mill.
Claim 18
Dependent Claim
90 words
A process for producing a green ceramic tape comprising (1) preparing a slip by thoroughly mixing 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the slip with a viscosity suitable for forming a tape, (2) casting the slip so prepared into a tape, and (3) drying the tape from step (2) to prepare a green ceramic tape.
Claim 19
Dependent Claim
90 words
A process for producing a green ceramic tape comprising (1) preparing a slip by thoroughly mixing 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide the slip with a viscosity suitable for forming a tape, (2) casting the slip so prepared into a tape, and (3) drying the tape from step (2) to prepare a green ceramic tape.
Claim 20
Dependent Claim
14 words
The process of claim 15, wherein said dispersing agent is a non-ionic dispersing agent.
Claim 21
Dependent Claim
25 words
The process of claim 15, wherein said dispersing agent has an ionic charge of the same polarity as that of said water-compatible polyurethane resin binder.
Claim 22
Dependent Claim
20 words
The process of claim 15, wherein said dispersing agent is present in an amount of about 1 part by weight.
Claim 23
Dependent Claim
66 words
The process of claim 15, wherein said slip is prepared by milling a mixture comprising 100 parts by weight of a finely divided ceramic powder, 2 to 15 parts by weight of a water-compatible polyurethane resin binder, an amount of dispersing agent effective for dispersing said ceramic powder, and an amount of water sufficient to provide said mixture with a viscosity suitable for forming a tape.
Claim 24
Dependent Claim
14 words
The process of claim 19, wherein said milling is conducted in a ball mill.
Claim 25
Dependent Claim
41 words
The process of claim 15, wherein said drying is conducted in two stages, wherein in the first stage the drying is conducted in an atmosphere having a relative humidity of 65 to 80% and a temperature of 30° to 45° C.
Claim 26
Dependent Claim
55 words
The process of claim 21, wherein the first stage of said drying is conducted in a first chamber having an atmosphere having a relative humidity of 65 to 85% and a temperature of 30° to 45° C. and said second chamber has an atmosphere having a relative humidity lower than that of said first chamber.
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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |