INK

• Main Authors: NAKAGAWA TOMOHIRO, HAGIWARA HIRONORI, KAJI YUKI, NONAKA YUTARO, UMEMURA KAZUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2020
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COLOUR PRINTING; CORRECTING FLUIDS; CORRECTION OF TYPOGRAPHICAL ERRORS; DYES; FILLING PASTES; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; INKS; LINING MACHINES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS; USE OF MATERIALS THEREFOR; WOODSTAINS

To provide an ink that is excellent in the scratch resistance of an image formed on a polymeric film for flexible packaging, and has excellent discharge stability and excellent stability in decapping.SOLUTION: The ink includes water, a color material, an organic solvent, acrylic resin particles, and polycarbonate urethane resin particles. In the ink, the organic solvent is at least any of 3-methoxy-3-methyl-1-butanol, 3-methoxy-1-butanol, 1-methoxy-2-propanol, propylene glycol monomethyl ether, 1-methoxy-2-propylacetate, and butyl propylene glycol, the breaking strength of the polycarbonate urethane resin particles is 30 MPa or more, the glass transition points (Tg) of the acrylic resin particles is 40°C or more, a mass ratio between the polycarbonate urethane resin particles and the acrylic resin particles (polycarbonate urethane resin particles/acrylic resin particles) is 25/75 to 75/25, and the content of the acrylic resin particles is 4.5 mass% or less with respect to the total amount of the ink.SELECTED DRAWING: None 【課題】軟包装向け高分子フィルムへ画像を形成した画像の耐擦過性に優れ、吐出安定性及びデキャップ時の安定性に優れたインクの提供。【解決手段】水、色材、有機溶剤、アクリル樹脂粒子、及びポリカーボネート系ウレタン樹脂粒子を含有するインクであって、前記有機溶剤が、３−メトキシ−３−メチル−１−ブタノール、３−メトキシ−１−ブタノール、１−メトキシ−２−プロパノール、プロピレングリコールモノメチルエーテル、１−メトキシ−２−プロピルアセテ−ト、及びブチルプロピレングリコールの少なくともいずれかであり、前記ポリカーボネート系ウレタン樹脂粒子の破断強度が、３０ＭＰａ以上であり、前記アクリル樹脂粒子のガラス転移点（Ｔｇ）が４０℃以上であり、前記ポリカーボネート系ウレタン樹脂粒子と前記アクリル樹脂粒子との質量比（ポリカーボネート系ウレタン樹脂粒子／アクリル樹脂粒子）が、２５／７５〜７５／２５であり、前記アクリル樹脂粒子の含有量が、インク全量に対して、４．５質量％以下である、インク。【選択図】なし