MONOAZO LAKE PIGMENT COMPOSITION AND GRAVURE INK USING THE SAME

• Main Authors: GOTO SACHIKO, JOMARU OSAMU, SHITAKA MOTOI, MAKI HITOSHI, KITAMURA KENJI, KATO SHIGEKI
• Format: Patent
• Language: English
• Published: 04.03.2004
• Edition: 7
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; LAKES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To provide a gravure ink composition excellent in flowability, stability with time, printing aptitude, and gloss of printed matter. SOLUTION: This monoazo lake pigment composition is obtained by coupling a diazo component obtained by diazotizing an aromatic amine having a soluble group with a coupler component, followed by laking, or performing the coupling and laking at the same time. The laking reaction is performed in the presence of a water-soluble acrylic polymer in an amount of 0.1-40 pts.wt. per 100 pts.wt. of the coupler component. Alternatively, a water-soluble acrylic polymer in an amount of 0.1-30 pts.wt. is further added to 100 pts.wt. (solid component) of the aqueous slurry after the laking, to form a surface-treated pigment composition, or a powder of a water-soluble acrylic polymer in an amount of 0.1-30 pts.wt. is further added and mixed to 100 pts.wt. of the pigment obtained by filtering and drying the aqueous slurry after the laking, to form a pigment composition. The gravure ink comprises one of the pigment compositions and a gravure ink vehicle. COPYRIGHT: (C)2004,JPO