公开(公告)号：US11603630B2

公开(公告)日：2023-03-14

申请号：US17256653

申请日：2019-04-10

申请人： KURITA WATER INDUSTRIES LTD.

发明人： Tomonari Katou ,  Chigusa Taguchi

IPC分类号： D21H21/18 ,  D21H21/16 ,  D21H17/14 ,  D21H17/19 ,  D21H17/28 ,  D21H17/00

摘要： To provide a surface sizing agent for papermaking, which has good low foamability and mechanical stability and has an excellent sizing effect. The surface sizing agent for papermaking is a surface sizing agent for papermaking, comprising a composition obtained by polymerizing unsaturated monomers in the presence of a starch, wherein the amount of the starch is 25 to 40 mass % based on the total amount of the starch and the unsaturated monomers, the unsaturated monomers comprise at least a styrenic compound and a (meth)acrylic ester compound, and the amount of the styrenic compound is 10 mass % or more and less than 30 mass %, and the amount of the (meth)acrylic ester compound is 20 to 50 mass %, based on the total amount of the starch and the unsaturated monomers.