Patent ID: 8148358

Claim:
A process for enhancing the contrast of color filters comprising α copper phthalocyanine or ε copper phthalocyanine, wherein a 1,4-diamino-anthraquinone dye or 1,9-annellated derivative thereof, of which the most bathochromic dichloromethane solution absorption peak in the visible spectrum is at from 575 to 615 nm, is added to α copper phthalocyanine or ε copper phthalocyanine and dispersed together with the copper phthalocyanine in a liquid medium; is added to a suspension comprising a liquid and α copper phthalocyanine or ε copper phthalo-cyanine, which suspension is then dispersed; is added to a dispersion comprising a liquid and α copper phthalocyanine or ε copper phthalo-cyanine; or is added to a liquid, followed by addition of α copper phthalocyanine or ε copper phthalocyanine and dispersion into the liquid; the resulting dispersion comprising both α copper phthalocyanine or ε copper phthalocyanine and the 1,4-diamino-anthraquinone dye or 1,9-annellated derivative thereof is applied to a substrate; and a color filter layer is formed by drying and/or curing; wherein the 1,4-diamino-anthraquinone dye or 1,9-annellated derivative thereof is of formula (I) wherein X 1 is O or S; X 2 is O and X 3 is NH 2 or NHR 11 ; or X 2 and X 3 are together ═C(R 12 )—CON(R 11 )— or ═N—C(R 12 )═N—; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 ,R 9 and R 10 are each independently from all others H, halogen, CN, CONR 13 R 14 or COOR 14 , or benzyl or C 1 -C 20 alkyl which are unsubstituted or substituted one or more times by halogen, CN, CONR 13 R 14 or COOR 14 ; or R 2 and/or R 9 are alternatively SO 2 NR 13 R 14 ; R 8 is H, CONR 13 R 14 or SO 2 NR 13 R 14 ; R 11 and R 12 are each independently from all others benzyl or C 1 -C 20 alkyl which are unsubstituted or one or more times substituted b halogen, OH, O—C 1 -C 20 alkyl or CN; or R 12 is alternatively H; each R 13 independently from any other R 13 is H or R 15 ; R 14 and R 15 independently from one another and each R 14 or R 15 independently from any other R 14 or R 15 are C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 2 -C 20 alkenyl, C 2 -C 20 alkynyl, C 3 -C 20 cycloalkenyl or C 7 -C 20 aralkyl which are each unsubstituted or substituted one or more times by halogen, hydroxy, amino, oxo, thio, C 1 -C 8 alkylamino, di(C 1 -C 8 alkyl)amino, C 1 -C 8 alkoxy or C 1 -C 8 alkylthio; and when R 14 and R 15 comprise aliphatic chains, the aliphatic chains are uninterrupted or interrupted from 1 to n - 2 2 times by O, S, NH or N(C 1 -C 8 alkyl, n being the total number of aliphatic carbon atoms in R 14 and R 15; and R 14 and R 15 can optionally be linked together through an additional direct bond between them; and two radicals of formula (I) can optionally be linked together via a direct bond or a group —O—, —S—, —NR 14 —, —CO—, —CONR 14 — or —CO 2 — connecting together each a substituent R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 and R 14 from both radicals of formula (I).