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US 6,270,566 B1Granted
Process for colouring building materials
AssigneeBayer Aktiengesellschaft
InventorsJakob Rademachers, Günther Teichmann
Life of this patent
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Abstract
A process is disclosed for coloring building materials with inorganic pigments in the form of microgranulates. The granulates comprise one or more pigments and one or more compounds selected from boron, aluminum, silicon, titanium, zinc and tin.
Claims17
A process for coloring inorganic building materials which comprises:
- (a) combining particulate inorganic building materials with microgranulates of pigments, said microgranulates
- (i) being substantially free of organic liquefiers;
- (ii) consisting essentially of one or more inorganic pigments selected from the group consisting of iron, chromium, manganese and titanium oxides, and from about 0.05 to about 1 percent (%) by weight, calculated as oxide and based on the quantity of pigment, of one or more boron, aluminum, silicon, titanium, zinc or tin compounds;
- (iii) having an average particle size between about 50 and 500 μm;
- and
- (iv) being sufficiently unstable to shearing forces such that they break down and disperse the pigment in the building materials substantially as if the pigment was not microgranulated;
- and
- (b) mixing the combination of building materials and microgranulates thereby subjecting the combination to shearing forces which break down the microgranulates and intimately disperse the pigment throughout the building materials to impart a final color intensity to the building materials.
5 more elements
A dispersible microgranulate inorganic pigment composition for coloring inorganic particulate building materials, consisting essentially of:
- (a) one or more inorganic pigments selected from the group consisting of iron, chromium, manganese and titanium oxides;
- (b) from about 0.05 to about 1 percent (%) by weight, calculated as oxide and based on the quantity of pigment, of one or more boron, aluminum, silicon, titanium, zinc and tin compounds;
- and
- said microgranulates having an average particle size of between about 50 and about 500 μm, and being substantially free of organic liquefiers, and being sufficiently unstable to shearing forces such that when the microgranulates are combined with the inorganic building materials and mixed, the shearing forces of mixing break down the microgranulates and intimately disperse the pigment throughout the building materials to impart a final color intensity to the building materials, substantially as if the pigment was not microgranulated.
1 more element
Dependencies are inferred from the claim text.