Method for producing thermally cleavable, soluble pigment derivatives

US6365720B1 · kind B1 · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Hans-Thomas Schacht · Rheinfelden (Baden), DE
• Ramaswami Sreenivasan · Mumbai, IN
• Mudaliar Dayal Chandrasekhar · Mumbai, IN
• Gilbert Moegle · Magstatt-le-Bas, FR
• Barbara Wagner · Charleston, US
• Charles E. Monnier · Villars-sur-Glâne, CH

Key dates

• Filing date: Jun 20, 2001
• Grant date: Apr 2, 2002
• Expiry date: Jun 20, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/029
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for preparing a compound of the formula A(D)x(E)y (I) by reaction of a compound of the formula A(H)x(H)y with a pyrocarbonic acid diester of the formula whereinx and y are each independently of the other an integer from 0 to 6, but x and y are not simultaneously the number 0,A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo, phthalocyanine or diketopyrrolopyrrole series, which radical is bonded via one or more nitrogen atoms to x groups D and via one or more oxygen atoms to y groups E, the nitrogen atoms and oxygen atoms forming part of the radical A,each group D or E independently of any other(s) is hydrogen or a group of the formula wherein at least one group D or E is not hydrogen, and L is any desired group suitable solubilization,in the presence of a base as catalyst, in which method the reaction takes place in an aromatic or heteroaromatic solvent selected from diphenyl, pyridine, quinoline, pyrrole and benzene unsubstituted or mono- to tri-substituted by C1-C6alkyl, phenyl, benzyl, C1-C6-alkoxy, phenoxy, C1-C24alkylthio, halogen and/…