Patent US2304779A successfully refreshed from Google Patents.
Patent US3837877A successfully refreshed from Google Patents.
US3837877A
Expired / Lapsed
US
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Production of rod-shaped micro-crystallites from clay
Assignee: JM Huber Corp
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Filing: 1973-01-10
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Granted: 1974-09-24
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Expires: 1993-01-10
Abstract
Abstract A method for preparing unique rod-shaped micro-crystalline particulates from kaolin clay is disclosed. The method involves the hydrothermal treatment of an aqueous dispersion of kaolin clay and a hydroxide of an alkali metal which transforms the clay into alumino-silicate rod-shaped micro-crystallites. The product has particular utility as reinforcing agents for non-elastomer type plastics. By controlling the process variables a product having predetermined characteristics and/or properties can be obtained.
Inventors
- 👤 O Bertorelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:08
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C01; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10; C01P2004/12; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/19; C01P2006/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
An improved process for producing rod-shaped micro-crystallites having predetermined characteristics or properties and particular use as a reinforcing pigment for non-elastomeric type plastics, said process comprising the steps of: forming an aqueous dispersion of kaolin clay and potassium hydroxide, said clay comprising particles predominately of the mineral kaolinite, at least 50 percent of said particles being less than 2 microns; the molar ratio of said potassium hydroxide and kaolin clay in said dispersion being 2:1, subjecting said dispersion to hydrothermal treatment at superatmospheric pressures and a temperature in the range of from about 150*to 280*C and maintaining said pressures and temperatures for a period in the range of from about 1 to 10 hours to effect reaction between the reactive components and to transform said kaolin clay into elongated rod-shaped micro-crystallites.
Claim 2
Dependent Claim
132 words
An improved process for producing rod-shaped micro-crystallites having predetermined characteristics or properties and particular use as a reinforcing pigment for non-elastomeric type plastics, said process comprising the steps of: forming an aqueous dispersion of kaolin clay and sodium hydroxide, said clay comprising particles predominately of the mineral kaolinite, at least 50 percent of said particles being less than 2 microns; the molar ratio of said sodium hydroxide and kaolin clay in said dispersion being 2:1, subjecting said dispersion to hydrothermal treatment at superatmospheric pressures and a temperature in the range of from about 150* to 280*C and maintaining said pressures and temperatures for a period in the range of from about 1 to 10 hours to effect reaction between the reactive components and to transform said kaolin clay into elongated rod-shaped micro-crystallites.
Claim 3
Dependent Claim
65 words
A micro-crystalline alumino-silicate of the formula: X2O.Al2O3.2SiO2.2H2O, wherein X is an alkali metal selected from the group consisting of lithium and potassium, said alumino-silicate comprising rod-shaped micro-crystallites having a specific gravity of about 2.1 to 2.5; an oil absorption in the range of from 50-60 cc/100g; a G.E. brightness value of about 80 to 90 and a surface area of about 10 to 15 m2/g.
References Cited (Backward Citations)
US3037843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |