申请人:Nippon Shokubai Co., Ltd.
公开号:EP3395909A1
公开(公告)日:2018-10-31
The present invention provides a water-soluble film having excellent solubility in cold water, high strength, and excellent hard-water resistance. The present invention also provides a method for simply producing such a water-soluble film. One aspect of the present invention relates to a water-soluble film including a polymer containing an anionic group other than a sulfonic acid (salt) group, and a water-soluble resin. The anionic group-containing polymer excludes an acrylic acid homopolymer. Another aspect of the present invention relates to a method for producing a water-soluble film that includes a polymer containing an anionic group other than a sulfonic acid (salt) group, and a water-soluble resin. The method includes mixing a polymer containing an anionic group other than a sulfonic acid (salt) group and a water-soluble resin.
本发明提供了一种在冷水中具有优异溶解性、高强度和优异耐硬水性的水溶性薄膜。本发明还提供了一种简单生产这种水溶性薄膜的方法。本发明的一个方面涉及一种水溶性薄膜,包括含有除磺酸(盐)基团以外的阴离子基团的聚合物和水溶性树脂。含阴离子基团的聚合物不包括丙烯酸均聚物。本发明的另一方面涉及一种生产水溶性薄膜的方法,该薄膜包括含有除磺酸(盐)基团以外的阴离子基团的聚合物和水溶性树脂。该方法包括混合含有除磺酸(盐)基团以外的阴离子基团的聚合物和水溶性树脂。