The aqueous dispersion of the present invention is produced by incorporating a block copolymer (II) into an aqueous dispersion (I) of a block copolymer (I) in an aqueous solution containing a basic compound. The block copolymer (I) is composed of a polymer block (A) mainly constituted by a constitutional unit derived from an olefin monomer and a polymer block (B) constituted by a constitutional unit derived from a vinyl monomer (b1) having a carboxyl group, a carboxylic anhydride group or a sulfonic group and a constitutional unit derived from another vinyl monomer (b2) copolymerizable with the vinyl monomer (b1). The content of the basic component is 0.05 equiv or more of the carboxyl group, carboxylic anhydride group or sulfonic group, each contained in the unit derived from the vinyl monomer (b1). The block copolymer (II) is composed of a polymer block (X) mainly constituted by a constitutional unit derived from an aromatic vinyl monomer and a polymer block (Y) constituted by a constitutional unit derived from a conjugated diene monomer. The aqueous dispersion provides a flexible coating film which is excellent in bonding and adhesion properties to various substrates.
本发明的
水分散体是由将块聚合物(II)加入到含有基础化合物的
水溶液中的块聚合物(I)的
水分散体(I)中制备而成。块聚合物(I)由聚合物块(A)和聚合物块(B)组成,聚合物块(A)主要由源自烯烃单体的构成单元组成,聚合物块(B)由源自具有羧基,
羧酸酐基或
磺酸基的
乙烯单体(b1)和源自与
乙烯单体(b1)共聚的另一种
乙烯单体(b2)的构成单元组成。碱性组分的含量为羧基,
羧酸酐基或
磺酸基中,每个单元的含量为0.05当量或更多。块聚合物(II)由聚合物块(X)和聚合物块(Y)组成,聚合物块(X)主要由源自芳香
乙烯单体的构成单元组成,聚合物块(Y)由源自共轭二烯单体的构成单元组成。
水分散体提供了一种柔性涂层膜,具有优异的粘接和附着性能,适用于各种基材。