Patent ID: 6019834
Filing Date: 2000-02-01
Classification: B82Y,C01P,C08K,C09B,C09C,C09D,Y10T

Abstract:
A pigment comprising a pigment particle as core particle, selected from the group consisting of white pigment particles, black pigment particles, yellow pigment particles, orange pigment particles, brown pigment particles, red pigment particles, violet pigment particles, blue pigment particles and green pigment particles;a lower coat formed on at least a part of a surface of the pigment particle, comprising squaric acid, a polyol having an anthraquinone skeleton represented by the general formula (I): ##STR9## wherein m is an integer of 0 to 4, n is an integer of 0 to 4 and m+n is an integer of 2 to 4,or a mixture of the squaric acid and the polyol having an anthraquinone skeleton represented by the general formula (I)and an upper coat formed on at least a part of surface of said lower coat and pigment particle, comprising at least one alkylene glycol represented by the general formula (II):C.sub.q H.sub.2q (OH).sub.2 (II)wherein q is an integer of 2 to 10;wherein the amount of squaric acid is 0.01 to 10% by weight, calculated as carbon based on the total weight of the pigment particle as core particle, the amount of the polyol of formula (I) is 0.01 to 10% by weight, calculated as carbon based on the total weight of the pigment particle as core particle, the total amount of squaric acid and the polyol of formula (I) is 0.01 to 10% by weight, calculated as carbon based on the total weight of the pigment particle as core particle, and the amount of the alkylene glycol of formula (II) is 0.01 to 10% by weight, calculated as carbon based on the total weight of the pigment particle as core particle.