INK, INK MEDIUM SET, AND METHOD FOR IMPROVING SCRATCH RESISTANCE

• Main Authors: SAI HA, TAKAHASHI HIROTOSHI, DAN AYA, TAKEDA MICHIAKI, IWASAKI TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 14.10.2022
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; 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; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS; USE OF MATERIALS THEREFOR; WOODSTAINS

To provide ink which has little change of glare of a coated film even when a scratch mark such as nail is generated when used in an ink hardly absorbable printing medium, in particular, in coat paper such as offset coat paper, and is excellent in storage stability, an ink medium set of ink and a printing medium, and a method for improving scratch resistance of the same.SOLUTION: An ink composition contains a water-insoluble coloring agent selected from the group consisting of a pigment, a dispersion dye and a solvent dye, a resin as a dispersion agent having a weight average molecular weight of less than 50,000, at least one or more resin emulsions having a weight average molecular weight of 50,000 or more, and a silane-modified silica sol having a particle size of 3 nm or more and less than 35 nm.SELECTED DRAWING: None 【課題】インク難吸収性の印刷メディア、特にオフセットコート紙等のコート紙に使用したときに、爪などの擦過痕がついたとしても、塗膜のぎらつきの変化が少ない、保存安定性に優れたインク、インクと印刷メディアのインクメディアセット、及びその耐擦性の向上方法の提供。【解決手段】顔料、分散染料、溶剤染料からなる群から選択される水不溶性の着色剤、重量平均分子量が５００００未満である分散剤としての樹脂、重量平均分子量が５００００以上である少なくとも１種類以上の樹脂エマルション、及び、粒子径が３ｎｍ以上３５ｎｍ未満であるシラン修飾シリカゾルを含む、インク組成物。【選択図】なし