Provided is a binder that has satisfactory storage stability and can express an excellent bonding strength for a glass fiber or powdered glass (impart a satisfactory strength to a bonded body with the glass fiber or the powdered glass). The binder of the present invention includes: a polymer having a hydroxyl group, in which: the polymer contains a specific structural unit derived from a monomer represented by the general formula (1) and a specific structural unit derived from a monomer containing a carboxylic acid (salt) group; a content of the structural unit derived from the monomer represented by the general formula (1) is from 5 mol % to 40 mol % with respect to 100 mol % of structural units derived from all monomers; a content of the structural unit derived from the monomer containing a carboxylic acid (salt) group is from 60 mol % to 95 mol % with respect to 100 mol % of the structural units derived from all the monomers; 2 mol % or more of the carboxylic acid (salt) groups in the polymer are neutralized with a volatile base and/or a nonvolatile base; 0 mol % to 15 mol % of the carboxylic acid (salt) groups in the polymer are neutralized with the nonvolatile base; and 0 mol % to 50 mol % of the carboxylic acid (salt) groups in the polymer are neutralized with the volatile base.
本发明提供了一种粘合剂,该粘合剂具有令人满意的贮存稳定性,并能为
玻璃纤维或粉末
玻璃提供出色的粘合强度(为
玻璃纤维或粉末
玻璃的粘合体提供令人满意的强度)。本发明的粘结剂包括:具有羟基的聚合物,其中该聚合物包含由通式(1)所代表的单体衍生出的特定结构单元和由含有
羧酸(盐)基团的单体衍生出的特定结构单元;相对于由所有单体衍生出的结构单元的 100 摩尔%,由通式(1)所代表的单体衍生出的结构单元的含量为 5 摩尔%至 40 摩尔%;由含有
羧酸(盐)基团的单体衍生的结构单元的含量,相对于由所有单体衍生的结构单元的 100 摩尔%,为 60 摩尔%至 95 摩尔%;聚合物中 2 摩尔%或更多的
羧酸(盐)基团用挥发性碱和/或非挥发性碱中和;聚合物中 0 摩尔%至 15 摩尔%的
羧酸(盐)基团被非挥发性碱中和;以及聚合物中 0 摩尔%至 50 摩尔%的
羧酸(盐)基团被挥发性碱中和。