Patent ID: 9327992
Filing Date: 2016-05-03
CPC Classification: B82Y,C01F,C01P,C08K,C09C,C09D,D21H

Claim Text:
1. A pigment particle composition which comprises calcium carbonate particles and pigment particles, wherein the calcium carbonate particles are non-spherical in form and wherein at least part of the calcium carbonate particles are carbonated so that they bind to each other to form calcium carbonate structures which comprise at least one pigment particle, wherein the calcium carbonate particles are in the crystalline form of calcite or aragonite and are in external form rhombic or rhombohedric, and form a shell that at least partially encases the at least one pigment particle and together with the pigment particles, form pigment-calcium carbonate aggregates which comprise at least two pigment particles and which have an opacity of the same magnitude as the pigment, wherein the weight ratio between the pigment particles and the calcium carbonate particles is approximately 90:10 . . . 5:95 and wherein more than 50 weight % of the pigment particles remain attached to the calcium carbonate particles when said pigment particle composition is dispersed in water and dried.