CURABLE COMPOSITION AND PRODUCTION METHOD OF THE SAME, AND CURED PRODUCT AND SEALING MATERIAL

To provide a curable composition that gives a cured product having good workability, a high recovery rate, a good elongation property and a good appearance while suppressing blistering.SOLUTION: The curable composition comprises: a polyoxyalkylene polymer A having a branched structure, which has at least three main-chain terminal groups in one molecule and more than 0.5 in average of a reactive silicon group per one main-chain terminal group; a polymer B having a linear structure, which has two main-chain terminal groups in one molecule and more than 0.5 in average of a reactive silicon group per one main-chain terminal group; and a vinyl polymer C having at least one reactive silicon group in one molecule. In the composition, the proportion of the mass of the polymer A with respect to the total mass of the polymer A and the polymer B is 0.5 to 1.0, and the proportion of the mass of the polymer C with respect to the total mass of the polymer A, the polymer B and the polymer C is 0.1 to 0.6.SELECTED DRAWING: None 【課題】作業性が良好で、復元率が高く、伸び物性が良好であり、かつ膨れの発生が抑制された外観が良好な硬化物を得る硬化性組成物。【解決手段】１分子中に３個以上の主鎖末端基を有し、反応性ケイ素基を１つの主鎖末端基あたりに平均して０．５個超有する、分岐構造を有するポリオキシアルキレン重合体Ａと、１分子中に２個の主鎖末端基を有し、反応性ケイ素基を１つの主鎖末端基あたりに平均して０．５個超有する、直鎖構造を有する重合体Ｂと、１分子中に１個以上の反応性ケイ素基を有するビニル重合体Ｃを有し、前記重合体Ａと前記重合体Ｂの合計の質量に対する前記重合体Ａの質量の割合が０．５〜１．０であり、かつ、前記重合体Ａ、前記重合体Ｂ及び前記重合体Ｃの合計の質量に対する重合体Ｃの質量の割合が、０．１〜０．６である、硬化性組成物を提供する。【選択図】なし