Yellow iron oxide pigments

a yellow iron oxide and pigment technology, applied in the direction of iron oxides/hydroxides, coatings, inks, etc., can solve the problems of unfavorable oil absorption value for end users

Inactive Publication Date: 2007-11-15
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The yellow iron oxide pigments produced by these processes are notable for a bright, yellow colour, but have an oil absorption value the end user finds unfavourable.

Method used

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  • Yellow iron oxide pigments

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examples

Description of Measurement Methods Used

A. Measurement of Colour Coordinates in L64, White Reduction and Full Shade

[0029]The pigment was prepared using the Muller in a non-drying test binder. The test binder (paste) is composed of two components for the white reduction; for the full shade only component 1 is used:

Component 1

[0030]SACOLYD® L640 (Krems Chemie AG, AU, alkyd resin binder based on linseed oil and phthalic anhydride) (formerly ALKYDAL® L64 (Bayer AG, DE)). It corresponds to the specifications given in standards DIN EN ISO 787-24 (October 1995), ISO 787-25: 1993 and DIN 55983 (December 1983) as requirements of a test binder for colour pigments.

Component 2

[0031]LUVOTHIX® HT (Lehmann & Voss & Co., DE, pulverulent, modified, hydrogenated castor oil) as a rheological additive added for the thixotroping of the paste. It was used in a concentration of 5.0% by weight, based on component 1.

[0032]Component 2 was dissolved in component 1 at 75-95° C. The cooled, compact material was ...

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Abstract

The present invention relates to improved yellow iron oxide pigments and to their use.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to improved yellow iron oxide pigments and to their use.[0003]2. Brief Description of the Prior Art[0004]The precipitation process and also the Penniman-Zoph process of producing yellow iron oxide pigments have been known for a long time. The typical course of these processes is described by way of example in Ullmann's Encyclopaedia of Industrial Chemistry, 5th Ed., Vol. A20, p. 297 ff., or in U.S. Pat. No. 1,327,061 A1 and U.S. Pat. No. 1,368,748 A1 and DE 3907910 A1. The raw material and electrolyte catalyst used is commonly iron(II) sulphate, which is obtained in the pickling of steel sheets or in the production of titanium dioxide by the sulphate process. A further possibility is the use of iron(II) sulphate from the production of low-alloy steel residues in the form of sheets, wire rolls, Fe powder with sulphuric acid.[0005]In general, α-FeOOH (yellow iron oxide) is prepared from iron(...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/00C09C1/22A23L5/49C09D7/61
CPCC01G49/02C01P2006/60C01P2006/63C09D7/1216C04B14/308C08K3/22C09C1/24C01P2006/64C09D7/61
Inventor ROSENHAHN, CARSTEN
Owner LANXESS DEUTDCHLAND GMBH
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