The present invention provides an alkali-soluble resin with which a cured film having high extensibility, reduced stress, high adhesion to a metal, and high heat resistance can be obtained, and a photosensitive resin composition containing the alkali-soluble resin, and the present invention is an alkali-soluble resin (A) including a structure represented by a general formula (1) wherein X1 represents a divalent organic group having 2 to 100 carbon atoms, Y1 and Y2 each represent a divalent to hexavalent organic group having 2 to 100 carbon atoms, X2 represents a tetravalent organic group having 2 to 100 carbon atoms, p and q each represent an integer in a range of 0 to 4, and n1 and n2 each represent an integer in a range of 5 to 100,000, wherein (I) and (II) described below are satisfied: (I) an organic group having an aliphatic chain having 8 to 30 carbon atoms is contained as X1 of the general formula (1) at a content of 30 to 70 mol % based on 100 mol % of a total of X1 and X2, and (II) an organic group having a diphenyl ether structure is contained as Y1 of the general formula (1) at a content of 1 to 30 mol % based on 100 mol % of a total of Y1 and Y2.
本发明提供了一种碱溶性
树脂,利用其可以获得具有高延伸性、低应力、对
金属的高附着力以及高耐热性的固化膜,并提供含有该碱溶性
树脂的光敏
树脂组合物。本发明的碱溶性
树脂(A)包含由通式(1)表示的结构,其中X1表示具有2至100个
碳原子的二价有机基团,Y1和Y2各自表示具有2至100个
碳原子的二价至六价有机基团,X2表示具有2至100个
碳原子的四价有机基团,p和q各自表示0至4之间的整数,n1和n2各自表示5至100,000之间的整数,并且满足以下(I)和(II)条件:
(I) 在通式(1)中,作为X1的含有具有8至30个
碳原子的
脂肪链的有机基团的含量基于X1和X2的总量为30至70摩尔%;
(II) 在通式(1)中,作为Y1的含有
二苯醚结构的有机基团的含量基于Y1和Y2的总量为1至30摩尔%。