Surface-modified pigment compositions

摘要

Pigment compositions containing organic pigments with an outstanding migration-free property and an excellent rheology at high concentration, and derivatives thereof containing heterocyclic substituents. The pigment compositions contains (a) carbon black or an organic pigment containing a chromophore Q1 of the following formula,;
wherein Z1 and Z2 are O or N—, C· is a carbon atom with an electron in a p orbital, and n is an integer from 1 to 4; and (b) a compound containing a chromophore of the following formula (II),
;
wherein Q2 is an m-valent residue of carbon black or of the chromophore Q1; G1 is preferably
;
and R1, R2, R3, R4, R5, R6, and R8 are preferably all H; m is an integer from 1 to 4. The pigment compositions can be used as rheology modifiers, preferably for pigmented coating compositions.

主权项

1. A pigment composition, comprising:
(a) (a1) carbon black or (a2) an organic pigment comprising a chromophore Q1 comprising a group of formula (I),  or a cis/trans isomer thereof, wherein Z1 and Z2 are each independently of the other, O or N—, each C· is independently of all other C·, a carbon atom with an electron in a p orbital, and n is an integer from 1 to 4; and (b) from 0.5 to 30 moles, based on 3.5·104 g of the carbon black (a1) or 100 moles of the organic pigment (a2), of a compound comprising a chromophore of formula (II), wherein, Q2 is an m-valent residue of carbon black or of the chromophore Q1; G1 is  with one extremity of G1 attached to an aromatic C atom in a meta position relative to Q2 and another extremity of G1 attached to the aromatic C atom in a para position relative to Q2; R8 has, independently from R4 the same definition as R4; R1, R2 and R3 are each, independently of the others H, halogen, OH, NH2, NO2, R7, OR7, SRS, NR6R7, COR7, CO2R7, CONR6R7 or SO2R7; each R4 is, independently from any other R4, H or R7; each R5 is, independently from any other R5, H, halogen, OH, NH2, NO2, R7, OR7, SR7, NR6R7, COR7, CO2R7, CONR6R7 or SO2R7; R6 is H, a direct bond to a geminal R5 or R7 thus forming a 3- to 8-membered homo- or heterocyclic ring, or R7 which is independently from any other R7; each R7 is, independently of any other R7, C1-C8alkyl, C3-C8cycloalkyl, C2-C8alkenyl, C2-C8alkinyl or C3-C8cycloalkenyl which are each unsubstituted or substituted with at least one substituent selected from the group consisting of a halogen, an amino and a hydroxy, and are uninterrupted or interrupted by one or more —O—, —S—, —NH— or —N(C1-C4alkyl)-; and m is an integer from 1 to 4.