C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/194
C09C 3/00 (2006.01) C03C 17/23 (2006.01) C09C 1/00 (2006.01) C09C 1/24 (2006.01) C09C 1/36 (2006.01)
Patent
CA 2006525
Abstract The invention relates to a method for the preparation of transparent metal oxide pigment, in which a substan- tial portion of the silicon oxide is dissolved off from silicon dioxide based particles coated with transpa- rent metal oxide, and to a transparent metal oxide pig- ment 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 substan- tially soluble in base and metal oxide portion is subs- tantially insoluble in base, and the dissolution is carried out by base. The silicon dioxide based particles can be selected from the 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 sur- face of the silicon dioxide based particles and they are in the form of single closed sheets or flakes.
Eskelinen Pekka J.
Vapaaoksa Pekka J.
Eskelinen Pekka J.
Kemira Oy
Perley-Robertson Hill & Mcdougall Llp
Vapaaoksa Pekka J.
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