Adhesive composition for printed wiring boards, bonding film, coverlay, copper-clad laminate and printed wiring board
申请人:SUMITOMO ELECTRIC INDUSTRIES, LTD.
公开号:US10244626B2
公开(公告)日:2019-03-26
An object of the present invention is to provide an adhesive composition for a printed wiring board, the adhesive composition having a good heat resistance. Another object of the present invention is to provide a coverlay for a printed wiring board, a copper-clad laminate, and a printed wiring board, all of which use the adhesive composition for a printed wiring board. The present invention provides an adhesive composition for a printed wiring board, the adhesive composition containing a siloxane-modified polyimide that includes structural units represented by formulae (1) and (2) below, an epoxy resin, and an inorganic filler. The siloxane-modified polyimide has a weight-average molecular weight (Mw) of 25,000 or more and 150,000 or less. A content of the inorganic filler is 10 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the siloxane-modified polyimide. In formulae (1) and (2), Ar represents a tetravalent aromatic tetracarboxylic acid residue, m is 0.35 or more and 0.75 or less, and n is 0.25 or more and 0.65 or less. R1 in formula (1) represents a divalent diamine siloxane residue, and R2 in formula (2) represents a divalent aromatic diamine residue.
本发明的一个目的是提供一种用于印刷线路板的粘合剂组合物,该粘合剂组合物具有良好的耐热性。本发明的另一个目的是提供一种用于印刷线路板的覆盖层、一种覆铜层压板和一种印刷线路板,所有这些都使用了用于印刷线路板的粘合剂组合物。本发明提供了一种用于印刷线路板的粘合剂组合物,该粘合剂组合物含有硅氧烷改性聚酰亚胺(包括下式(1)和(2)所代表的结构单元)、环氧树脂和无机填料。硅氧烷改性聚酰亚胺的重量平均分子量(Mw)为 25,000 或以上,150,000 或以下。相对于 100 质量份的硅氧烷改性聚酰亚胺,无机填料的含量为 10 质量份或以上,100 质量份或以下。在式(1)和(2)中,Ar 代表四价芳香族四羧酸残基,m 为 0.35 或 0.35 以上和 0.75 或 0.75 以下,n 为 0.25 或 0.25 以上和 0.65 或 0.65 以下。式(1)中的 R1 代表二价二胺硅氧烷残基,式(2)中的 R2 代表二价芳香族二胺残基。