Claims
- 1. A precipitated silica matting agent coated with a polyethylene wax emulsion, characterized by the following physico-chemical parameters:BET surface area (DIN 66131) in m2/g351-600DBP index (DIN 53601) as a %300-380Carbon Content as a %1-8Compacted density (DIN 53194) in g/l 70-140Grindometer value (ISO 1524) in μm26-41d10 value4.66-6.91Size distribution index I0.464-0.65 Measured with a Malvern instrument, whereinSize distribution index I=d90-d102d50.
- 2. A process for preparing a precipitated silica matting agent coated with a polyethylene was emulsion in accordance with claim 1, comprising:adding a polyethylene wax emulsion to a precipitated silica having the following characteristics: BET surface area (DIN 66131) in m2/g400-600DBP index (DIN 53601) as a %340-380Compacted density (DIN 53194) in g/l180-220“Alpine” sieve residue > 63 μm wt. %25-60to form a mixture;drying the mixture; and milling the dry mixture using a classifier mill or a fluidized bed counter-flow mill.
- 3. The process according to claim 2, wherein the drying step is carried out by spray drying.
- 4. A process for using the precipitated silica according to claim 1, comprising:adding the precipitated silica to a lacquer system as a matting agent.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 55 287 |
Dec 1997 |
DE |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This is a division of application Ser. No. 09/208,454, filed Dec. 10, 1998 pending.
This application is a continuation of U.S. provisional application Ser. No. 60/070,191, filed Dec. 30, 1997, and German patent application No. DE 19755287.0, filed Dec. 12, 1997, the entire disclosures of these applications being incorporated herein by reference.
US Referenced Citations (10)
Foreign Referenced Citations (5)
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May 1983 |
DE |
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Jan 1990 |
DE |
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EP |
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Non-Patent Literature Citations (1)
Entry |
Prospekt 213/3d der Firma Alpine, “Multi-Prozessanlage”, Apr. 25, 1996, pp. 1-17. |
Provisional Applications (1)
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Number |
Date |
Country |
|
60/070191 |
Dec 1997 |
US |