US4496506A
Expired / Lapsed
US
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Method for shaping green body of ceramic powder and ceramic body obtained by firing same
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1982-08-30
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Granted: 1985-01-29
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Expires: 2002-08-30
Abstract
Abstract The invention provides a novel method for shaping a green body of a ceramic powder by use of a specific organic binder, which is a modified polyvinyl alcohol comprising monomeric units expressed by the formula <IMAGE> in which R is a monovalent hydrocarbon group having at least 4 carbon atoms, Z is a divalent linking unit of -O- or -O-CO- and a is zero or 1, in a limited mole fraction, Due to the strong binding power and lubricity of the binder polymer, the wet blend of ceramic powder with an aqueous solution of the binder has good workability in shaping and the wet shaped body has good shape retainability. The shaped body after drying also has excellent mechanical strength to facilitate handling.
Inventors
- 👤 Naoyuki Sakato
- 👤 Tetsuo Kitagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63416; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A method for shaping a green body of a ceramic powder which comprises: admixing 100 parts by weight of a ceramic powder with an aqueous solution containing from 0.1 to 10 parts by weight of, as a binder, a modified polyvinyl alcohol substantially composed of the monomeric units expressed by the formulas ##STR3## in mole fractions x, y and z, respectively, in which R is a monovalent hydrocarbon group having at least 4 carbon atoms, Z is a divalent linking unit which is either --O-- or --O--CO--, a is a number of zero or 1, y is a positive number not exceeding 0.3 and z is a positive number in the range from 0.0001 to 0.1 with the proviso that x+y+z is equal to 1, to give a blend wet with the aqueous solution, shaping the wet blend into a formed body, and drying the thus shaped formed body.
Claim 2
Independent Claim
149 words
A method for shaping a green body of a ceramic powder which comprises: admixing 100 parts by weight of a ceramic powder with an aqueous solution containing from 0.1 to 10 parts by weight of, as a binder, a modified polyvinyl alcohol substantially composed of the monomeric units expressed by the formulas ##STR3## in mole fractions x, y and z, respectively, in which R is a monovalent hydrocarbon group having at least 4 carbon atoms, Z is a divalent linking unit which is either --O-- or --O--CO--, a is a number of zero or 1, y is a positive number not exceeding 0.3 and z is a positive number in the range from 0.0001 to 0.1 with the proviso that x+y+z is equal to 1, to give a blend wet with the aqueous solution, shaping the wet blend into a formed body, and drying the thus shaped formed body.
Claim 3
Dependent Claim
19 words
The method as claimed in claim 1 wherein the mole fraction y is a positive number not exceeding 0.25.
Claim 4
Dependent Claim
51 words
The method as claimed in claim 1 wherein the modified polyvinyl alcohol is an at least partially saponified product of a copolymer prepared by the copolymerization of vinyl acetate and a 1-alkene compound represented by the general formula CH 2 ═CH--R, in which R has the same meaning as defined above.
Claim 5
Dependent Claim
52 words
The method as claimed in claim 1 wherein the modified polyvinyl alcohol is an at least partially saponified product of a copolymer prepared by the copolymerization of vinyl acetate and an alkyl vinyl ether represented by the general formula CH 2 ═CH--O--R, in which R has the same meaning as defined above.
Claim 6
Dependent Claim
51 words
The method as claimed in claim 1 wherein the modified polyvinyl alcohol is an at least partially saponified product of a copolymer prepared by the copolymerization of vinyl acetate and a vinyl carboxylate represented by the general formula CH 2 ═CH--O--CO--R, in which R has the same meaning as defined above.
Claim 7
Dependent Claim
36 words
The method as claimed in claim 1 wherein the monovalent hydrocarbon group denoted by R has at least 8 carbon atoms and the mole fraction z has a value in the range from 0.0001 to 0.005.
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 |