AQUEOUS PRINTING INK COMPOSITION FOR PAPER CONTAINER

• Main Authors: SAI TETSUYA, SAKAZUME MASAHIRO, TSUKAWAKI HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 01.09.2016
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To provide an aqueous printing ink composition for paper container that has good ink transferability in overprinting while maintaining an alcohol-dilutability and is excellent in gloss of a printed matter.SOLUTION: The aqueous printing ink composition comprises an aqueous binder resin including (A) an acrylic emulsion and (B) an alkali-soluble acrylic resin in which 1) the acrylic emulsion (A) has a core/shell structure, has a glass transition temperature of 50°C or less and is composed of a shell part containing 20 to 60 wt% of a (meth)acrylic acid ester and 2 to 10 wt% of a (meth)acrylic acid and a core part containing 15 to 40 wt% of styrene and 10 to 30 wt% of a (meth)acrylic acid ester; and 2) the weight ratio of the solid content of the acrylic emulsion (A) and the solid content of the alkali-soluble acrylic resin (B) is 95:5 to 80:20.SELECTED DRAWING: None 【課題】紙器用の水性印刷インキにおいて、アルコール希釈性を維持しつつ重ね印刷のインキ転移性が良好で、印刷物の光沢に優れる印刷インキ組成物を提供することにある。【解決手段】水性バインダー樹脂がアクリルエマルジョン（Ａ）とアルカリ可溶性アクリル樹脂（Ｂ）を含む水性印刷インキ組成物であり、１）アクリルエマルジョン（Ａ）がコア／シェル構造を有し、ガラス転移温度が５０℃以下であり、シェル部分が（メタ）アクリル酸エステル２０〜６０重量％、（メタ）アクリル酸２〜１０重量％、コア部分がスチレン１５〜４０重量％、（メタ）アクリル酸エステル１０〜３０重量％、２）アクリルエマルジョン（Ａ）とアルカリ可溶性アクリル樹脂（Ｂ）の固形分の重量比率が９５：５〜８０：２０であることを特徴とする。【選択図】なし