US 2025/0163274 A1 · WHITE UV-ABSORBING SURFACE-REACTED CALCIUM CARBONATE DOPED WITH A TITANIUM SPECIES

Abstract

The present invention refers to a white UV-absorbing surface-reacted calcium carbonate doped with a titanium species, comprising calcite and hydroxyapatite in a weight ratio of from 99:1 to 1:99 based on the dry weight of the calcite and the dry weight of the hydroxyapatite and having a specific surface area of from 15 m2/g to 200 m/2g, wherein the titanium species is present in an amount from 0.01 to 20 wt.-% of titanium element, based on the total dry weight of the surface-reacted calcium carbonate. Furthermore, the present invention refers to a process for producing the white UV-absorbing surface-reacted calcium carbonate doped with a titanium species, the use of said white UV-absorbing surface-reacted calcium carbonate doped with a titanium species as well as an article comprising said white UV-absorbing surface-reacted calcium carbonate doped with a titanium species.

Claims21

Dependent claims

A process for producing a white UV-absorbing surface-reacted calcium carbonate doped with a titanium species comprising the steps of:

a) providing a calcium carbonate-comprising material,
b) providing at least one H3O+ ion donor,
c) providing at least one titanium comprising substance, and
d) treating the calcium carbonate-comprising material of step a) with the at least one H3O ion donor of step b) in an aqueous medium to form an aqueous suspension of surface-reacted calcium carbonate, and
wherein the at least one titanium comprising substance of step c) is added before and/or during and/or after step d).

2 more elements

A white UV-absorbing surface-reacted calcium carbonate doped with a titanium species, comprising calcite and hydroxyapatite and having a specific surface area of from 15 m2/g to 200 m2/g, measured using nitrogen and the BET method according to ISO 9277:2010,

wherein the weight ratio of calcite to hydroxyapatite is from 99:1 to 1:99 based on the dry weight of the calcite and the dry weight of the hydroxyapatite, and
wherein the titanium species is present in an amount from 0.01 to 20 wt.-% of titanium element, based on the total dry weight of the surface-reacted calcium carbonate.

Dependencies are inferred from the claim text.

White uv-absorbing surface-reacted calcium carbonate doped with a titanium species

Life of this patent

White uv-absorbing surface-reacted calcium carbonate doped with a titanium species

Life of this patent

Abstract

Claims21