Abstract: This invention relates to a process for preparing quinacridone pigment compositions by (a) heating a reaction mixture containing (i) 2,5-dianilinoterephthalic acid or 2,5-dianilino-6,13-dihydroterephthalic acid or a derivative thereof, (ii) about 0.1 to about 5 percent, based on component (a)(i), of 2,5-di(sulfamoylanilino)terephthalic acid and/or 2,5-di(sulfamoylanilino)-6,13-dihydroterephthalic acid or a derivative thereof, (iii) about 0.1 to about 15 percent by weight, based on component (a)(i), of other sulfonyl-containing derivatives of 2,5-dianilinoterephthalic acid and/or 2,5-dianilino-6,13-dihydroterephthalic acid, (iv) about 3 to about 20 parts by weight, per part of component (a)(i), of a dehydrating agent, and (v) optionally, a solvent; (b) drowning the reaction mixture from step (a) with a liquid in which the quinacridone pigment composition is substantially insoluble; and (c) isolating the quinacridone pigment composition.

Abstract: This invention relates to a process for preparing quinacridone pigment compositions by

Abstract: This invention relates to pigment derivatives having the formula ##STR1## wherein Q represents an organic pigment moiety;X is -SO.sub.2 - or -CO-;Alk is C.sub.2 -C.sub.8 alkylene or substituted C.sub.2 -C.sub.8 alkylene;m is an integer of from 1 to 4;n and p are independently integers of from 2 to 6.This invention further relates to the treatment of organic pigments with such pigment derivatives and the use of such treated pigments in coating compositions.

Abstract: This invention relates to a process for preparing pigment compositions by(a) treating an organic pigment with(1) a sterically hindered and/or bulky primary amine, and(2) a liquid in which the organic pigment is insoluble, and(b) blending the resultant surface-treated pigment composition from step (a) with a pigment derivative of formula (I) ##STR1## wherein Q represents an organic pigment moiety,X is O, S, NR.sup.1, --SO.sub.2 --, --CO--, --Alk--, --Ar--, or combinations thereof,Y is --OR.sup.2, --NR.sup.3 R.sup.4, or Het,Alk is C.sub.1 -C.sub.5 alkylene, C.sub.2 -C.sub.5 alkenylene, or C.sub.4 -C.sub.5 alkadienylene, or substituted derivatives thereof,Ar is arylene,R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.7 -C.sub.16 aralkyl, or C.sub.6 -C.sub.10 aryl,Het is a heterocycle, andn is 1 to 4.

Abstract: This invention relates to pigment compositions containing an organic pigment treated with a pigment derivative having the formula (I) ##STR1## wherein Q represents an organic pigment moiety;X is O, S, or N--R.sup.1 ;Y is N--R.sup.2, O, or a direct bond;Z is --CO--, --Alk--, --Ar--, or chemically reasonable combinations thereof;Alk is C.sub.1 -C.sub.5 alkylene, C.sub.2 -C.sub.5 alkenylene, or C.sub.4 -C.sub.5 alkadienylene, or substituted derivatives thereof;Ar is arylene;R.sup.1 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.7 -C.sub.16 aralkyl, or --CN; andR.sup.2 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.7 -C.sub.16 aralkyl, or C.sub.6 -C.sub.10 aryl;with the provisos that(1) the cyclic moiety represented by the formula ##STR2## must be a four- to seven-membered ring, (2) Z can contain a C.dbd.O group adjacent to the nitrogen atom of the Q--CH.sub.2 --N moiety only if Y is N--R.sup.2 or O, and(3) X can be O only if Y is N--R.sup.2 or O.

Abstract: This invention relates to a process for the preparation of quinacridone pigments by(a) heating a reaction mixture comprising(i) a 2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6-dihydroterephthalic acid, or a 2,5-dianilino-3,6-dioxo-1,4-cyclohexadiene-1,4-dicarboxylic acid;(ii) about 0.1 to about 15 percent by weight, based on component (a)(i), of one or more sulfonyl-containing derivatives of 2,5-dianilinoterephthalic acid, 2,5-dianilino-3,6-dihydroterephthalic acid, and/or 2,5-dianilino-3,6-dioxo-1,4-cyclohexadiene-1,4-dicarboxylic acid; and(iii) about 3 to about 20 parts by weight, per part of component (a)(i), of a dehydrating agent,with the proviso that if either component (a)(i) or component (a)(ii) is a 2,5-dianilino-3,6-dihydroterephthalic acid or derivative thereof, reaction step (a) additionally comprises an oxidation step;(b) drowning the reaction mixture from step (a) with a liquid in which the quinacridone pigment is substantially insoluble; and(c) isolating the quinacridone pigment.

Abstract: This invention relates to a process for the preparation of quinacridone pigments by(a) heating, at a temperature of about 80.degree. C. to about 145.degree. C., a reaction mixture containing(i) 2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6-dihydroterephthalic acid ester, and/or a derivative thereof,(ii) about 3 to about 15 parts by weight, per part of component (a)(i), of a dehydrating agent, and(iii) about 0.

Abstract: This invention relates to pigment compositions comprising an organic pigment treated with about 0.1 to about 20% by weight, based on the organic pigment, of an N-heteroarylamidomethyl pigment derivative having the formula (I) ##STR1## wherein, Q represents an organic pigment moiety,NHet represents a nitrogen-containing heteroaromatic group attached at a ring nitrogen atom to the carbonyl function of the amidomethyl linking group, andn is from 1 to 4.

Abstract: This invention relates to pigment compositions comprising an organic pigment treated with about 0.1 to about 20% by weight, based on the organic pigment, of a compound having the formula (I) ##STR1## wherein Q represents an organic pigment moiety,X is O or S,Het represents a heteroaromatic group attached at a ring carbon atom to the (thio)amidomethyl --CH.sub.2 --NH--CX-- linking group, andn is from 1 to 4.

Abstract: This invention relates to a process for the preparation of quinacridone pigments by(a) heating, at a temperature of about 80.degree. C. to about 145.degree. C., a reaction mixture containing(i) 2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6-dihydroterephthalic acid ester, and/or a derivative thereof,(ii) about 3 to about 15 parts by weight, per part of component (a)(i), of a dehydrating agent, and(iii) about 0.