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US 2023/0159767 A1Published application
Novel tint bases and a method of preparing tint bases
AssigneeFP-Pigments Oy
InventorPaul Dietz
Life of this patent
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Abstract
According to an example aspect of the present invention, there is provided a tint base comprising titanium dioxide, a vehicle, and conventional additives, which tint base is capable of displaying a preselected colour upon the addition of a colorant, wherein at least 4% by weight of the titanium dioxide is present in the form of opaque aggregates of titanium dioxide and precipitated calcium carbonate particles wherein the titanium dioxide particles are at least partially encased by the particles of precipitated calcium carbonate.
Claims17
A method for reducing an amount of titanium dioxide in a tint base, the method comprising:
- i) dispersing titanium dioxide particles and opaque aggregates that act as a substitute for titanium dioxide particles in a vehicle to form an intermediate tint base, the opaque aggregates comprising titanium dioxide particles at least partially encased by precipitated calcium carbonate particles;
- and
- ii) after step (i), adding back an additional amount of titanium dioxide particles to the intermediate tint base to form a final tint base.
Dependencies are inferred from the claim text.