US4174230A
Expired / Lapsed
US
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Gypsum compositions
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1978-02-15
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Granted: 1979-11-13
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Expires: 1998-02-15
Abstract
Abstract A gypsum composition comprising: (A) a lightweight spherical gypsum and (B) at least one binder selected from the group consisting of a water-soluble organic polymer, a water-dispersible organic polymer, a water-soluble inorganic compound, a water-dispersion medium colloid-forming inorganic compound, a water-hardenable compound and a mixture thereof. This gypsum composition provides a gypsum mold which is lightweight and, at the same time, has great mechanical strength.
Inventors
- 👤 Mitsuo Hashimoto
- 👤 Toshiyuki Takyu
- 👤 Masaru Inoue
- 👤 Masami Takasaki
- 👤 Shinho Shiho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:31
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/36; C04B14/365; C04B26/00; C04B26/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
An improved gypsum composition comprising (a) gypsum particles and (b) at least one binder for gypsum particles, the improvement comprising said gypsum particles being light-weight spherical gypsum formed of intertwined short gypsum fibers and having a bulk density of from 0.05 to 0.5 g/cm 3 .
Claim 2
Dependent Claim
46 words
An improved gypsum composition comprising (a) gypsum particles and (b) at least one binder for gypsum particles, the improvement comprising said gypsum particles being light-weight spherical gypsum formed of intertwined short gypsum fibers and having a bulk density of from 0.05 to 0.5 g/cm 3 .
Claim 3
Dependent Claim
31 words
A gypsum composition as in claim 1, wherein said binder is in an amount of 0.5 to 1,000 parts by weight per 100 parts by weight of the lightweight spherical gypsum.
Claim 4
Dependent Claim
31 words
A gypsum composition as in claim 1, wherein said binder is in an amount of 0.5 to 20,000 parts by weight per 100 parts by weight of the lightweight spherical gypsum.
Claim 5
Dependent Claim
32 words
The composition of claim 3, wherein said binder is selected from the group consisting of Portland cement, alumina cement, Portland blast furnace cement, magnesia cement, powdery gypsum, mortar, magnesium hydroxide and lime.
Claim 6
Dependent Claim
42 words
The composition of claim 2, wherein said binder is selected from the group consisting of polyvinyl alcohol, a urea-formaldehyde low polymer, a melamine-formaldehyde low polymer, methyl cellulose, carboxymethylcellulose, an acrylamide based resin, a polyacrylic acid salt, a phenol resin prepolymer, and polysaccharides.
Claim 7
Dependent Claim
44 words
The composition of claim 2, wherein said binder is selected from the group consisting of polyvinyl acetate, polyvinyl chloride, a butadiene-styrene copolymer, polystyrene, a silicone polymer, an acryl resin, an acrylate polymer, a vinylacetateacrylonitrile copolymer, an acrylonitrile-butadiene-styrene copolymer, a styrene-acrylonitrile copolymer, wax, and asphalt.
Claim 8
Dependent Claim
36 words
The composition of claim 2, wherein said binder is selected from the group consisting of aluminum oxide (alumina sol), water glass, aluminum diphosphate, silica (silica sol), lithium silicate, sodium silicate, potassium silicate, and sulfur (sulfur sol).
Claim 9
Dependent Claim
32 words
The composition of claim 2, wherein said binder is selected from the group consisting of Portland cement, alumina cement, Portland blast furnace cement, magnesia cement, powdery gypsum, mortar, magnesium hydroxide and lime.
Claim 10
Dependent Claim
42 words
The composition of claim 1, wherein said binder is selected from the group consisting of polyvinyl alcohol, a urea-formaldehyde low polymer, a melamine-formaldehyde low polymer, methyl cellulose, carboxymethylcellulose, an acrylamide based resin, a polyacrylic acid salt, a phenol resin prepolymer, and polysaccharides.
Claim 11
Dependent Claim
44 words
The composition of claim 1, wherein said binder is selected from the group consisting of polyvinyl acetate, polyvinyl chloride, a butadiene-styrene copolymer, polystyrene, a silicone polymer, an acryl resin, an acrylate polymer, a vinylacetate-acrylonitrile copolymer, an acrylonitrile-butadiene-styrene copolymer, a styrene-acrylonitrile copolymer, wax, and asphalt.
Claim 12
Dependent Claim
36 words
The composition of claim 1, wherein said binder is selected from the group consisting of aluminum oxide (alumina sol), water glass, aluminum diphosphate, silica (silica sol), lithium silicate, sodium silicate, potassium silicate, and sulfur (sulfur sol).
Claim 13
Dependent Claim
32 words
The composition of claim 1, wherein said binder is selected from the group consisting of Portland cement, alumina cement, Portland blast furnace cement, magnesia cement, powdery gypsum, mortar, magnesium hydroxide and lime.
Claim 14
Dependent Claim
10 words
The composition of claim 2, wherein said binder is clay.
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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |