Patent EP-1591489-A1 (EP)
Inventor: FELDHUES ULRICH DR
IPC: C09B67/22
Filed: 2005-04-12
Abstract: A pigment formulation comprises: (a) at least one metal complex of an azo compound which is in the form of its tautomeric structures; (b) if appropriate an iron compound which is other than component (a) and whose iron content is less than 30 (preferably less than 20, especially less than 10, particularly 1 - 5) ppm; and (c) at least one metal compound whose metal is in each case other than that of the metal compounds of components (a) and (b). A pigment formulation comprises: (a) at least one metal complex of an azo compound which is in the form of its tautomeric structures conforms of formula (I); (b) if appropriate an iron compound which is other than component (a) and whose iron content is less than 30 (preferably less than 20, especially less than 10, particularly 1 - 5) ppm; and (c) at least one metal compound whose metal is in each case other than that of the metal compounds of components (a) and (b) and whose metal content is at least 10 ppm based on component (a). The metal is selected from alkali metals such as Li, Na and K, alkaline earth metals such as Mg, Ca and Ba, lanthanoids such as La, Ce, Pr and Nd and also Al, Sc, Ti, V, Cr, Mn, Co, Cu, Ni and Zn. The metal complex intercalates at least one other compound. X : =U 1 (preferably group of formulae (i) - (v)); U 1O, =S, =NR 7, -NR 6H 7, -OR 6, -SR 6, -COOR 6, -CN, -CONR 6 7, -SO 2R 8, -N(R 6)-CN or T 1; Y : U 1; T 1(cyclo)alkyl, aryl or aralkyl; R 1-R 4, R 6H or T 1 (optionally substituted); R 7H, cyano, T 1 or acyl; R 8T 1 (optionally substituted); R 1+R 2+R 3+R 45- or 6-membered rings to which further rings may be fused; R 5-OH, -NR 6R 7, or T 1 (optionally substituted); m,n,o,p : 0 or 1; L : ,M==O, =S or =NR 6; L 1H, -OR 6, -SR 6, -NR 6R 7, -COOR 6, -CONR 6R 7, -CN or T 1; M 1L 1, -SO 2R 8 or -N(R 6)-CN; M 1+R 1, M 1+R 25- or 6-membered ring. The sum of total of the endo- and exocyclic double bonds is three for each of the rings X and Y. Independent claims are included for the following: (1) production of the pigment formulation involving: complexing (I) with a metal salt (a) if appropriate in the presence of an iron salt (b) whose Fe content is less than 30 ppm, based on component (a) and in the presence of a metal salt (c) which is other than (a) and (b) and whose metal content is at least 10 ppm based on component (a); adding a compound before, during or after the complexing and thus intercalated and optionally adding additives; (2) photoresist comprises at least one photocurable monomer, at least one photoinitiator and the pigment formulation; (3) production of color filters for liquid crystal displays involving: grounding the pigment formulation in an organic solvent if appropriate in the presence of a binder resin and/or dispersant and subsequently processed in the presence of photocurable monomers, photoreaction initiator and if appropriate further binder and/or solvent to form a photoresist which is then applied by a coating method (preferably roller, spray, spin, dip or air knife coating), onto a substrate (preferably a glass plate), irradiated using a photomask and then cured and developed to form the ready-produced colored color filter; and (4) a liquid crystal display containing at least one color filter containing the pigment formulation. [Image].