US4496509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing ceramic tapes
Assignee: Narumi China Corp
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Filing: 1983-04-26
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Granted: 1985-01-29
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Expires: 2003-04-26
Abstract
Abstract A method of preparing green ceramic tapes, comprising adding to 100 parts by weight of a fine ceramic powder, 2 to 15 parts by weight, in terms of its resin content, of a binder mixture consisting of an aqueous polyurethane and a water-soluble acrylic resin, the amount of said water-soluble acrylic resin ranging from 10 to 1500 parts by weight per 100 parts by weight of said aqueous polyurethane in said binder mixture, adding a small amount of a dispersing agent to the mixture followed by a sufficient amount of water, kneading the resultant mixture for a time sufficient to prepare an aqueous slip, forming a tape in a known manner from said aqueous, and then drying the green tape obtained.
Inventors
- 👤 Katsuhiko Kita
- 👤 Junzo Fukuda
- 👤 Shiro Kawahito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/63448; C04B35/63468
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A method of preparing green ceramic tapes, comprising: adding to 100 parts by weight of a fine ceramic powder, 2 to 15 parts by weight, in terms of its resin content, of a binder mixture consisting of an aqueous polyurethane and a water-soluble acrylic resin, the amount of said water-soluble acrylic resin ranging from 10 to 1500 parts by weight per 100 parts by weight of said aqueous polyurethane in said binder mixture; adding a small amount of a dispersing agent to the mixture followed by a sufficient amount of water; kneading the resultant mixture for a time sufficient to prepare an aqueous slip; forming a tape from said aqueous slip; and then drying the green tape obtained.
Claim 2
Independent Claim
118 words
A method of preparing green ceramic tapes, comprising: adding to 100 parts by weight of a fine ceramic powder, 2 to 15 parts by weight, in terms of its resin content, of a binder mixture consisting of an aqueous polyurethane and a water-soluble acrylic resin, the amount of said water-soluble acrylic resin ranging from 10 to 1500 parts by weight per 100 parts by weight of said aqueous polyurethane in said binder mixture; adding a small amount of a dispersing agent to the mixture followed by a sufficient amount of water; kneading the resultant mixture for a time sufficient to prepare an aqueous slip; forming a tape from said aqueous slip; and then drying the green tape obtained.
Claim 3
Dependent Claim
61 words
The method of claim 1, wherein said water-soluble acrylic resin is obtained by reacting ammonia or an aqueous organic amine solution with a homopolymer of an ethylenically unsaturated carboxylic acid, a copolymer of an ethylenically unsaturated carboxylic acid and an acrylic monomer or a copolymer of an ethylenically unsaturated carboxylic acid, an acrylic monomer or an ethylenically unsaturated monomer copolymerizable therewith.
Claim 4
Dependent Claim
27 words
The method of claim 2, wherein said ethylenically unsaturated carboxylic acid is acrylic acid, 2-chloroacrylic acid, methacrylic acid, itaconic acid, maleic anhydride, maleic acid or fumaric acid.
Claim 5
Dependent Claim
31 words
The method of claim 2, wherein said acrylic monomer is methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, acrylamide, N-methylolacrylamide, methacrylamide, N-methylolmethacrylamide, diacetone acrylamide or diacetone methacrylamide.
Claim 6
Dependent Claim
20 words
The method of claim 2 wherein said ethylenically unsaturated monomer is styrene, vinyltoluene, vinyl acetate, vinyl propionate, acrylonitrile or methacrylonitrile.
Claim 7
Dependent Claim
25 words
The method of claim 2 wherein said organic amine is dimethylamine, trimethylamine, diethylamine, triethylamine, diisopropylamine, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylethanolamine, N-aminoethylethanolamine, or N-methyldiethanolamine.
Claim 8
Dependent Claim
32 words
The method of claim 1, wherein the polymeric components of said binder are emulsified with a dispersing agent selected from the group consisting of polyoxyethylene alkyl ether or a polyoxyalkylene phenol ether.
Claim 9
Dependent Claim
26 words
The method of claim 7, wherein the amount of dispersing agent ranges from 0.01 to 3% per 100 parts by weight of the fine ceramic powder.
Claim 10
Dependent Claim
15 words
The method of claim 1, wherein the binder mixture further contains a water-soluble organic solvent.
Claim 11
Dependent Claim
23 words
The method of claim 1, wherein said aqueous polyurethane component is a polyurethane emulsion, water-soluble polyurethane, a polyurethane dispersion or a polyurethane microemulsion.
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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |