Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1989-12-26
1991-12-31
Dixon, Jr., William R.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106403, 106436, 106456, 106189, C04B 1404
Patent
active
050768492
ABSTRACT:
The invention relates to a method for the preparation of transparent metal oxide pigment, in which a substantial portion of the silicon oxide is dissolved off from silicon dioxide based particles coated with transparent metal oxide, and to a transparent metal oxide pigment prepared by the method. In the extraction methods according to the prior art the problem is that in the extraction a part of the metal oxide is also dissolved, whereby thickness variations impairing the interference color of the metal oxide layer are created. Moreover, in the known methods hard-treated extraction chemicals which are detrimental for the environment are used. These problems have by means of the present invention been solved so that such particles are selected for the dissolution whose silicon dioxide portion is substantially soluble in base and metal oxide portion is substantially insoluble in base, and the dissolution is carried out by base. The silicon dioxide based particles can be selected from the beginning base-soluble particles or they can be made base-soluble by extracting them with mineral acid. The shape of the metal oxide particles obtained through base extraction corresponds fragmentarily to the form of the outer surface of the silicon dioxide based particles and they are in the form of single closed sheets or flakes.
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patent: 4814018 (1989-03-01), Tsurumaru et al.
patent: 4880472 (1989-11-01), Bugnon et al.
Eskelinen Pekka J.
Vapaaoksa Pekka J.
Dixon Jr. William R.
Kemira Oy
Thompson Willie J.
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