EP0375354A2
Expired / Lapsed
EP
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Process for preparation of aluminium borate whisker
Assignee: Shikoku Chemicals Corp
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Filing: 1989-12-19
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Granted: —
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Expires: 2009-12-19
Abstract
Abstract An aluminum borate whisker is prepared by heating and reacting aluminum sulfate and an oxide of boron, an oxyacid of boron or an alkali metal salt thereof in the presence of an alkali metal sulfate and an alkali metal carbonate. In this process, the reaction is advanced apparently in the solid phase, and this process is advantageous over the conventional processes in that the yield is high and the withdrawal of the reaction product is facilitated.
Inventors
- 👤 Hajime Hata
- 👤 Seiji Sogabe
- 👤 Keizo Oka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
C; C30; C30B; C30B1/00; C30B1/10; C30B29/00; C30B29/10; C30B29/60; C30B29/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A process for the preparation of an aluminium borate whisker, comprising heating and reacting aluminium sulphate as an aluminium source component and at least one boric anhydride source component selected from oxides, oxyacids and alkali metal salts of boron in the presence of an alkali metal sulphate and an alkali metal carbonate at a temperature of 1000 to 1200°C to grow a whisker.
Claim 2
Dependent Claim
63 words
A process for the preparation of an aluminium borate whisker, comprising heating and reacting aluminium sulphate as an aluminium source component and at least one boric anhydride source component selected from oxides, oxyacids and alkali metal salts of boron in the presence of an alkali metal sulphate and an alkali metal carbonate at a temperature of 1000 to 1200°C to grow a whisker.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the aluminium borate whisker has a composition represented by the formula of 9Al₂O₃.2B₂O₃.
Claim 4
Dependent Claim
32 words
A process according to claim 1 or claim 2 wherein the aluminium sulphate is finely divided anhydrous aluminium sulphate and the alkali metal carbonate is a finely divided anhydrous alkali metal carbonate.
Claim 5
Dependent Claim
96 words
A process for the preparation of an aluminium borate whisker, which comprises heating a mixure comprising (i) aluminium sulphate, (ii) a boron compound selected from the oxides, oxyacids and alkali metal salts of boron (iii) an alkali metal sulphate and (iv) an alkali metal carbonate, forming aluminium oxide in the mixture by reaction between the aluminium sulphate and the alkali metal carbonate at a temperature of 500 to 600°C, further heating the mixture and growing a whisker having a composition represented by the formula of 9Al₂O₃.2B₂O₃ in the mixture at a temperature of 1000 to 1200°C.
Claim 6
Dependent Claim
96 words
A process for the preparation of an aluminium borate whisker, which comprises heating a mixure comprising (i) aluminium sulphate, (ii) a boron compound selected from the oxides, oxyacids and alkali metal salts of boron (iii) an alkali metal sulphate and (iv) an alkali metal carbonate, forming aluminium oxide in the mixture by reaction between the aluminium sulphate and the alkali metal carbonate at a temperature of 500 to 600°C, further heating the mixture and growing a whisker having a composition represented by the formula of 9Al₂O₃.2B₂O₃ in the mixture at a temperature of 1000 to 1200°C.
Claim 7
Dependent Claim
91 words
A process for the preparation of a whisker having a composition represented by the formula of 9Al₂O₃.2B₂O₃, which comprises mixing aluminium sulphate with a boric anhydride source component so that the aluminium/boron molar ratio is from 6/4 to 9/2, adding an alkali metal sulphate so that the alkali metal/aluminium molar ratio is from 1/4 to 2/1, adding an alkali metal carbonate so that the alkali metal/aluminium molar ratio is from 1/1 to 3/1 and heating the mixture at a temperature of 1000 to 1200°C to effect reaction and grow a whisker.
Claim 8
Dependent Claim
91 words
A process for the preparation of a whisker having a composition represented by the formula of 9Al₂O₃.2B₂O₃, which comprises mixing aluminium sulphate with a boric anhydride source component so that the aluminium/boron molar ratio is from 6/4 to 9/2, adding an alkali metal sulphate so that the alkali metal/aluminium molar ratio is from 1/4 to 2/1, adding an alkali metal carbonate so that the alkali metal/aluminium molar ratio is from 1/1 to 3/1 and heating the mixture at a temperature of 1000 to 1200°C to effect reaction and grow a whisker.
Claim 9
Dependent Claim
57 words
A process for the preparation of an aluminium borate whisker, which comprises pulverising and mixing aluminium sulphate, a boric anhydride source, an alkali metal sulphate and an alkali metal carbonate, tabletting the mixture to form a starting mixture tablet, and heating the tablet at a temperature of 1000 to 1200°C to effect reaction and grow a whisker.
Claim 10
Dependent Claim
57 words
A process for the preparation of an aluminium borate whisker, which comprises pulverising and mixing aluminium sulphate, a boric anhydride source, an alkali metal sulphate and an alkali metal carbonate, tabletting the mixture to form a starting mixture tablet, and heating the tablet at a temperature of 1000 to 1200°C to effect reaction and grow a whisker.
References Cited (Backward Citations)
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