US4145404A
Expired / Lapsed
US
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Magnesium hydroxides having novel structure, process for production thereof, and resin compositions containing them
Assignee: Kyowa Chemical Industry Co Ltd
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Filing: 1977-11-10
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Granted: 1979-03-20
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Expires: 1997-11-10
Abstract
Abstract A novel magnesium hydroxide of the formula Mg(OH) 2 having (i) a strain in the <101> direction of not more than 3.0 × 10 -3 , (ii) a crystallite size in the <101> direction of more than 800 A, and (iii) a specific surface area of less than 20 m 2 /g. The magnesium hydroxide, if desired as coated with anionic surfactants, is useful, for example, as fire retardants for thermoplastic synthetic resins and aqueous paints. The novel magnesium hydroxide is prepared by heating in an aqueous medium at an elevated pressure a novel basic magnesium chloride or nitrate of this invention expressed by the formula Mg(OH) 2-x A x .sup.. mH 2 O wherein A is Cl or NO 3 , x is a number of more than 0 but less than 0.2, and m is a number of 0 to 6.
Inventors
- 👤 Shigeo Miyata
- 👤 Masataka Kuroda
- 👤 Akira Okada
- 👤 Tosihumi Okazaki
- 👤 Mitsuo Takasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:47
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C01; C01F; C01F5/00; C01F5/14; C01F5/26; C01F5/30; C01F5/38; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/60; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A magnesium hydroxide of the following formula Mg(OH).sub.2 which has (i) a strain in the <101> direction of not more than 3.0 × 10 -3 , (ii) a crystallite size in the <101> direction of more than 800 A, and (iii) a specific surface area, determined by the BET method, of less than 20 m 2 /g.
Claim 2
Dependent Claim
57 words
A magnesium hydroxide of the following formula Mg(OH).sub.2 which has (i) a strain in the <101> direction of not more than 3.0 × 10 -3 , (ii) a crystallite size in the <101> direction of more than 800 A, and (iii) a specific surface area, determined by the BET method, of less than 20 m 2 /g.
Claim 3
Dependent Claim
128 words
A process for preparing a magnesium hydroxide of the formula Mg(OH).sub.2 having (i) a strain in the <101> direction of not more than 3.0 × 10 -3 , (ii) a crystallite size in the <101> direction of more than 800 A, and (iii) a specific surface area, determined by the BET method, of less than 20 m 2 /g, which comprises heating a basic magnesium chloride or magnesium nitrate of the formula Mg(OH).sub.2-x A.sub.x.mH.sub.2 O wherein A represents Cl or NO 3 , x is a number of more than 0 but less than 0.2, and m is a number of 0 to 6, in an aqueous medium at an elevated pressure and temperature sufficient to convert said basic magnesium chloride or magnesium nitrate to said magnesium hydroxide.
Claim 4
Dependent Claim
128 words
A process for preparing a magnesium hydroxide of the formula Mg(OH).sub.2 having (i) a strain in the <101> direction of not more than 3.0 × 10 -3 , (ii) a crystallite size in the <101> direction of more than 800 A, and (iii) a specific surface area, determined by the BET method, of less than 20 m 2 /g, which comprises heating a basic magnesium chloride or magnesium nitrate of the formula Mg(OH).sub.2-x A.sub.x.mH.sub.2 O wherein A represents Cl or NO 3 , x is a number of more than 0 but less than 0.2, and m is a number of 0 to 6, in an aqueous medium at an elevated pressure and temperature sufficient to convert said basic magnesium chloride or magnesium nitrate to said magnesium hydroxide.
Claim 5
Dependent Claim
64 words
The process of claim 2 wherein said basic magnesium chloride or magnesium nitrate is prepared by reacting magnesium chloride or magnesium nitrate with an alkaline substance, selected from the group consisting of calcium hydroxide, ammonia and an alkali metal hydroxide, in an aqueous medium, the amount of the alkaline substance being 0.3 to 0.95 equivalent per equivalent of the magnesium chloride or magnesium nitrate.
Claim 6
Dependent Claim
41 words
The process of claim 2 wherein the basic magnesium chloride or magnesium nitrate is heated in an aqueous medium at a temperature of from about 150° to about 250° C. and a pressure of at least about 5 Kg/cm 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |