US4021259A
Expired / Lapsed
US
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Gypsum composition
Assignee: JSR Corp
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Filing: 1975-07-24
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Granted: 1977-05-03
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Expires: 1995-07-24
Abstract
Abstract A gypsum composition obtained by molding and drying an aqueous slurry comprising calcined gypsum, polyvinyl alcohol, and at least one metal compound. The composition has high surface hardness and high water resistance.
Inventors
- 👤 Koei Komatsu
- 👤 Kunihiro Harada
- 👤 Seiji Aotani
- 👤 Akio Itabashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:29
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B22/00; C04B22/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A gypsum composition obtained by molding and drying an aqueous slurry consisting essentially of (1) calcined gypsum, (2) 0.1 to 50% by weight, based on the weight of the calcined gypsum, of polyvinyl alcohol, (3) an aqueous solution of at least one metal compound selected from the group consisting of compounds of metals of Groups Ib, II, IIIa, IV, Vb, VIb, VIIb, and VIII of the Periodic Table, the amount of the metal compound being such that the ratio of metal atom to hydroxyl group in the polyvinyl alcohol is from 0.001 to 1, and (4) 50 to 120% by weight, based on the weight of the calcined gypsum, of water.
Claim 2
Dependent Claim
111 words
A gypsum composition obtained by molding and drying an aqueous slurry consisting essentially of (1) calcined gypsum, (2) 0.1 to 50% by weight, based on the weight of the calcined gypsum, of polyvinyl alcohol, (3) an aqueous solution of at least one metal compound selected from the group consisting of compounds of metals of Groups Ib, II, IIIa, IV, Vb, VIb, VIIb, and VIII of the Periodic Table, the amount of the metal compound being such that the ratio of metal atom to hydroxyl group in the polyvinyl alcohol is from 0.001 to 1, and (4) 50 to 120% by weight, based on the weight of the calcined gypsum, of water.
Claim 3
Dependent Claim
19 words
A composition according to claim 1, wherein the polyvinyl alcohol has a degree of saponification of 80 to 100%.
Claim 4
Dependent Claim
17 words
A composition according to claim 1, wherein the polyvinyl alcohol has a degree of saponification of 100%.
Claim 5
Dependent Claim
42 words
A composition according to claim 1, wherein the metal is selected from the group consisting of Cu, Ag, Au, Be, Mg, Ca, Sr, Ba, Zn, Cd, Hg, Al, Sn, Pb, Ti, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Co and Ni.
Claim 6
Dependent Claim
28 words
A composition according to claim 1, wherein the metal is selected from the group consisting of Cu, Ca, Zn, Al, Sn, Ti, Cr, Mo, Mn, Fe and Ni.
Claim 7
Dependent Claim
26 words
A composition according to claim 1, wherein the metal is selected from the group consisting of Cu, Ca, Sn, Ti, Cr, Mo, Mn, Fe and Ni.
Claim 8
Dependent Claim
19 words
A composition according to claim 1, wherein the metal is selected from the group consisting of Ca, and Ti.
Claim 9
Dependent Claim
22 words
A composition according to claim 1, wherein the metal compound is selected from the group consisting of calcium acetate, and titanium sulfate.
References Cited (Backward Citations)
US3284227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |