AQUEOUS COMPOSITE RESIN AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide an aqueous composite resin exhibiting excellent wet friction resistance, scratch resistance and base material adhesion to a non-polar film base material even under low temperature dry condition, and to provide an aqueous ink composition containing the same.SOLUTION: An aqueous composite resin (F) is obtained by polymerization of an ethylenically unsaturated monomer (E) containing a carboxyl group-containing ethylenically unsaturated monomer (e-1) and an amino group-containing ethylenically unsaturated monomer (e-2), by using an urethane urea resin (C-2) containing mercapto groups at both terminals obtained by reacting a compound (D) represented by general formula (1) with an urethane prepolymer (C-1) obtained by reaction of polyol (A) and polyisocyanate (B), as a chain transfer agent.SELECTED DRAWING: None 【課題】低温乾燥条件下においても、優れた耐水摩擦性、耐スクラッチ性、非極性フィルム基材に対する基材密着性を発現する水性複合樹脂およびそれを含有する水性インキ組成物の提供。【解決手段】ポリオール（Ａ）とポリイソシアネート（Ｂ）とを反応させてなるウレタンプレポリマー（Ｃ−１）に、一般式（１）で表される化合物（Ｄ）を反応させてなる両末端メルカプト基含有ウレタンウレア樹脂（Ｃ−２）を連鎖移動剤として、カルボキシル基含有エチレン性不飽和単量体（ｅ−１）およびアミノ基含有エチレン性不飽和単量体（ｅ−２）を含むエチレン性不飽和単量体（Ｅ）を重合してなる水性複合樹脂（Ｆ）。【選択図】なし