US4298386A
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Calcium silicate and process for producing same
Assignee: Osaka Packing Seizosho KK
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Filing: 1979-09-17
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Granted: 1981-11-03
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Expires: 1999-09-17
Abstract
Abstract Globular secondary particles of wollastonite group calcium silicate crystals represented by the formula lCaO.mSiO.sub.2.nH.sub.2 O wherein 1≦l≦6, 1≦m≦6 and 0≦n≦1, characterized in that the particles comprise hollow globular secondary particles of the wollastonite group calcium silicate crystals, the globular secondary particles having an average spontaneous sedimentation height of at least 800 ml, an outside diameter of 5 to 110 μm, an average apparent density of 0.04 to 0.09 g/cm 3 and an average shell density defined by the equation Y=0.0033X+B wherein Y is the average shell density, X is the average diameter of the particles, B is a constant, 15 μm≦X≦40 μm and 0≦B≦0.115.
Inventors
- 👤 Kazuhiko Kubo
- 👤 Akira Takahashi
- 👤 Kenichi Oohashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:29
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/24; C04; C04B; C04B28/00; C04B28/18; C04B28/186; C04B35/00; C04B35/01; C04B35/16; C04B35/22; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
106 words
Globular secondary particles of wollastonite group calcium silicate crystals represented by the formula lCaO.mSiO.sub.2.nH.sub.2 O wherein 1≦l≦6, 1≦m≦6 and 0≦n≦1, characterized in that the particles consist essentially of hollow globular secondary particles of the wollastonite group calcium silicate crystals, the globular secondary particles having an average spontaneous sedimentation height of at least 800 ml, an outside diameter of 5 to 110 μm, an average apparent density of 0.04 to 0.09 g/cm 3 and an average shell density defined by the equation Y=0.0033X+B wherein Y is the average shell density, X is the average diameter of the particles, B is a constant, 15 μm≦X≦40 μm and 0≦B≦0.115.
Claim 2
Dependent Claim
106 words
Globular secondary particles of wollastonite group calcium silicate crystals represented by the formula lCaO.mSiO.sub.2.nH.sub.2 O wherein 1≦l≦6, 1≦m≦6 and 0≦n≦1, characterized in that the particles consist essentially of hollow globular secondary particles of the wollastonite group calcium silicate crystals, the globular secondary particles having an average spontaneous sedimentation height of at least 800 ml, an outside diameter of 5 to 110 μm, an average apparent density of 0.04 to 0.09 g/cm 3 and an average shell density defined by the equation Y=0.0033X+B wherein Y is the average shell density, X is the average diameter of the particles, B is a constant, 15 μm≦X≦40 μm and 0≦B≦0.115.
Claim 3
Dependent Claim
48 words
Globular secondary particles of calcium silicate as defined in claim 1 further consisting essentially of tobermorite group crystals admixed with the wollastonite group calcium silicate crystals in an amount of up to 100 parts by weight per 100 parts by weight of the wollastonite group calcium silicate crystals.
Claim 4
Dependent Claim
22 words
Globular secondary particles of calcium silicate as defined in claim 1 wherein the average spontaneous sedimentation height is at least 850 ml.
Claim 5
Dependent Claim
31 words
Globular secondary particles of calcium silicate as defined in claim 1 wherein the globular secondary particles of calcium silicate are about 0.1 to about 7.0 μm in the thickness of shell.
Claim 6
Dependent Claim
25 words
A slurry of calcium silicate crystals consisting essentially of the globular secondary particles of calcium silicate as defined in claim 1 and dispersed in water.
Claim 7
Dependent Claim
34 words
A slurry of calcium silicate crystals as defined in claim 5 in which contains the water is present in an amount of at least 15 times the weight of the solids in the slurry.
Claim 8
Dependent Claim
29 words
A slurry of calcium silicate crystals as defined in claim 5 wherein at least about 80% of the globular secondary particles are 10 to 50 μm in outside diameter.
Claim 9
Dependent Claim
18 words
A slurry of calcium silicate crystals as defined in claim 5 further consisting essentially of a reinforcing material.
Claim 10
Dependent Claim
19 words
A slurry of calcium silicate crystals as defined in claim 8 wherein the reinforcing material is a fibrous material.
Claim 11
Dependent Claim
35 words
A slurry of calcium silicate crystals as defined in claim 9 wherein the fibrous reinforcing material is in the form of inorganic fibers at least partly joined with the globular secondary particles of calcium silicate.
Claim 12
Dependent Claim
17 words
A slurry of calcium silicate crystals as defined in claim 5 further consisting essentially of a surfactant.
Claim 13
Dependent Claim
114 words
A shaped body of wollastonite group calcium silicate crystals represented by the formula lCaO.mSiO.sub.2.nH.sub.2 O wherein 1≦l≦6, 1≦m≦6, 0≦n≦1, characterized in that the shaped body consists essentially of hollow globular secondary particles of crystals of wollastonite group calcium silicate, the globular secondary particles being joined with one another and having, before shaping, an average spontaneous sedimentation height of at least 800 ml, an outside diameter of 5 to 110 μm an average apparent density of 0.04 to 0.09 g/cm 3 and an average shell density defined by the equation Y=0.0033X+B wherein Y is the average shell density, X is the average diameter of the particles, B is a constant, 15 μm≦X≦40 μm and 0≦B≦0.115.
Claim 14
Dependent Claim
114 words
A shaped body of wollastonite group calcium silicate crystals represented by the formula lCaO.mSiO.sub.2.nH.sub.2 O wherein 1≦l≦6, 1≦m≦6, 0≦n≦1, characterized in that the shaped body consists essentially of hollow globular secondary particles of crystals of wollastonite group calcium silicate, the globular secondary particles being joined with one another and having, before shaping, an average spontaneous sedimentation height of at least 800 ml, an outside diameter of 5 to 110 μm an average apparent density of 0.04 to 0.09 g/cm 3 and an average shell density defined by the equation Y=0.0033X+B wherein Y is the average shell density, X is the average diameter of the particles, B is a constant, 15 μm≦X≦40 μm and 0≦B≦0.115.
Claim 15
Dependent Claim
18 words
A shaped body as defined in claim 12 further consisting essentially of a reinforcing material uniformly incorporated therein.
Claim 16
Dependent Claim
16 words
A shaped body as defined in claim 13 wherein the reinforcing material is a fibrous material.
Claim 17
Dependent Claim
17 words
A shaped body as defined in claim 12 further consisting essentially of a surfactant uniformly incorporated therein.
Claim 18
Dependent Claim
124 words
A process for producing the globular secondary particles of calcium silicate as defined in claim 1 characterized by the steps of dispersing siliceous particles up to 0.5 μm in average diameter with 70% by weight of said particles being up to 2 μm in diameter to prepare a first slurry, admixing the first slurry with milk of lime to form a starting slurry, subjecting the starting slurry to hydrothermal reaction with continuous or temporarily interrupted stirring to prepare an active slurry of calcium silicate crystals, and drying the active slurry, the milk of lime having a sedimentation volume of at least 5 ml, the starting slurry containing water in an amount at least 30 times the weight of the solids of the starting slurry.
Claim 19
Dependent Claim
20 words
A process as defined in claim 16 wherein the fine siliceous particles are silicon dust and/or fine particle reinforcing silica.
Claim 20
Dependent Claim
21 words
A process as defined in claim 16 wherein the milk of lime has a sedimentation volume of at least 8 ml.
Claim 21
Dependent Claim
116 words
A process for producing the active slurry of calcium crystals as defined in claim 5 characterized by the steps of dispersing siliceous particles up to 0.5 μm in average diameter with 70% by weight of said particles being up to 2 μm in diameter to prepare a first slurry admixing the first slurry with milk of lime to form a starting slurry, subjecting the starting slurry to hydrothermal reaction with application of pressure and heat and with continuous or temporarily interrupted stirring, the milk of lime having a sedimentation volume of at least 5 ml, the starting slurry containing water in an amount at least 30 times the weight of the solids of the starting slurry.
Claim 22
Dependent Claim
17 words
A process as defined in claim 19 wherein the starting slurry further incorporates an inorganic reinforcing material.
Claim 23
Dependent Claim
15 words
A process as defined in claim 19 wherein the starting slurry further incorporates a surfactant.
Claim 24
Dependent Claim
29 words
A process for producing a shaped body of calcium silicate characterized by shaping the slurry of calcium silicate crystals as defined in claim 5 and drying the shaped mass.
Claim 25
Dependent Claim
13 words
A process as defined in claim 22 wherein the slurry incorporates a surfactant.
Claim 26
Dependent Claim
14 words
A process as defined in claim 22 wherein the slurry incorporates a reinforcing material.
Claim 27
Dependent Claim
23 words
A process as defined in claim 22 wherein the shaped body is baked to convert the xonotlite forming the shaped body to β-wollastonite.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |