A negative-type photosensitive resin composition that has a satisfactory imidization rate and can yield a resin layer with high chemical resistance, even under low-temperature curing conditions of 200° C. or below, the negative-type photosensitive resin composition containing a photopolymerization initiator (B) in a proportion of 0.1 part by mass to 20 parts by mass with respect to 100 parts by mass of a polyimide precursor (A), the polyimide precursor (A) being a polyamic acid ester or polyamic acid salt with a specific structure, and the weight-average molecular weight (Mw) of the polyimide precursor (A) being 3,000 or greater and less than 16,000, in terms of polystyrene, according to gel permeation chromatography (GPC).
一种负型感光
树脂组合物,该组合物具有令人满意的
亚胺化率,即使在 200°C 或以下的低温固化条件下也能生成具有高耐
化学腐蚀性的
树脂层,该负型感光
树脂组合物含有光聚合
引发剂 (B),其与聚
酰亚胺前体 (A) 的质量比为 0.相对于 100 份聚
酰亚胺前体(A)而言,聚
酰亚胺前体(A)的质量为 1 份至 20 份,聚
酰亚胺前体(A)为具有特定结构的聚酰胺酸酯或聚酰胺酸盐,根据凝胶渗透色谱法(
GPC),聚
酰亚胺前体(A)的重量平均分子量(Mw)为 3,000 或更大且小于 16,000 (以聚
苯乙烯计)。