Photosensitive resin composition, solder resist comprising the same, cover lay film, and printed circuit board
申请人:——
公开号:US20040048978A1
公开(公告)日:2004-03-11
The present invention relates to a photosensitive resin composition having excellent heat resistance, processability, and adhesion, and a solder resist comprising the composition, a cover lay film, and a printed circuit board obtained from or with these. The cover lay film is excellent in processability and adhesion at relatively low temperatures and has a low elastic coefficient after curing while keeping sufficient mechanical strength, so that the cover lay film is preferably used for a printed circuit board or a hard disk. The cover lay film is soluble and can be laminated at temperatures of not higher than 150° C., and a solder resist having excellent properties, such as heat resistance which can be laminated directly onto FPC without any adhesives and a cover lay film having few warps when laminated onto the FPC can be provided according to the present invention. The photosensitive resin composition comprises as essential components: a soluble polyimide (A) dissolved in solvent having a boiling point of not higher than 120° C.; and a compound (B) having at least one aromatic ring and at least 2 double bonds in one molecule, wherein the soluble polyimide is one obtained at least from an acid dianhydride having 1 to 6 aromatic rings or alicyclic acid dianhydride and/or a diamine having 1 to 6 aromatic rings. The solder resist, cover lay film, etc. are excellent in heat resistance and mechanical properties and do not damage the substrate because they can be laminated at relatively low temperatures.
本发明涉及一种具有优异的耐热性、加工性和附着力的光敏树脂组合物,以及一种由该组合物、覆盖层薄膜和印刷电路板组成的阻焊材料。覆盖膜在相对较低的温度下具有优异的加工性和附着力,固化后弹性系数低,同时保持足够的机械强度,因此覆盖膜最好用于印刷电路板或硬盘。根据本发明,盖层薄膜是可溶的,可以在不高于 150°C 的温度下层压,并且可以提供一种具有优异性能(如耐热性)的阻焊剂,这种阻焊剂可以不使用任何粘合剂直接层压到 FPC 上,并且层压到 FPC 上时盖层薄膜很少翘曲。光敏树脂组合物的主要成分包括:溶解在沸点不高于 120 摄氏度的溶剂中的可溶性聚酰亚胺(A);以及在一个分子中至少具有一个芳香环和至少两个双键的化合物(B),其中可溶性聚酰亚胺至少是从具有 1 至 6 个芳香环的酸酐或脂环酸酐和/或具有 1 至 6 个芳香环的二胺中获得的。阻焊层、覆盖层薄膜等具有优异的耐热性和机械性能,并且不会损坏基材,因为它们可以在相对较低的温度下层压。