申请人:Toray Industries, Inc.
公开号:EP3835339A1
公开(公告)日:2021-06-16
A polysiloxane-polyalkylene glycol block copolymer obtained by reacting a polysiloxane (A) having a functional group selected from a carboxylic anhydride group, a hydroxyl group, an epoxy group, an amino group, and a thiol group with a polyalkylene glycol (B) having a functional group selected from a carboxylic anhydride group, a hydroxyl group, an amino group, an epoxy group, and a thiol group to obtain a polysiloxane-polyalkylene glycol block copolymer intermediate, and further reacting a part of the carboxyl groups of the polysiloxane-polyalkylene glycol block copolymer intermediate with a compound reactive with a carboxyl group, wherein a content of a structure derived from the polysiloxane (A) is 30% by mass or more and 70% by mass or less with respect to 100% by mass of the entire polysiloxane-polyalkylene glycol block copolymer, and wherein the polysiloxane-polyalkylene glycol block copolymer has a carboxyl group content of 0.1 mmol/g to 0.75 mmol/g and a weight average molecular weight of 5,000 to 500,000. Provided is a polysiloxane-polyalkylene glycol block copolymer which is well dispersed in an epoxy resin in the case of being blended with the epoxy resin, and can achieve a decreased stress of the cured epoxy resin.
一种聚硅氧烷-聚亚烷基二醇嵌段共聚物,由具有选自羧酸酐基团、羟基、环氧基团、氨基和硫醇基团的官能团的聚硅氧烷(A)与具有选自羧酸酐基团、羟基、氨基、环氧基团和硫醇基团的官能团的聚亚烷基二醇(B)反应而得、和硫醇基团的聚亚烷基二醇(B)与具有选自羧酸酐基团、羟基基团、氨基基团、环氧基团和硫醇基团的官能团的聚亚烷基二醇(B)反应,得到聚硅氧烷-聚亚烷基二醇嵌段共聚物中间体、将聚硅氧烷-聚亚烷基二醇嵌段共聚物中间体的部分羧基进一步与一种具有羧基反应性的化合物反应,其中,相对于整个聚硅氧烷-聚亚烷基二醇嵌段共聚物 100%的质量,由聚硅氧烷 (A) 衍生的结构的含量为 30%(质量)或以上,70%(质量)或以下;聚硅氧烷-聚亚烷基二醇嵌段共聚物的羧基含量为 0.1 mmol/g 至 0.75 mmol/g,重量平均分子量为 5,000 至 500,000。本发明提供了一种聚硅氧烷-聚亚烷基二醇嵌段共聚物,在与环氧树脂混合时,该共聚物能很好地分散在环氧树脂中,并能降低固化环氧树脂的应力。