Asahi Kasei E-Materials Corporation

Yoro Sasaki

Masaki Yamamoto

Yasuhito Iizuka

Koichiro Shimoda

Shuji Kashiwagi

Hiroaki Adachi

A resin composition containing (A) a polyimide having acidic functional groups and (B) a compound having functional groups that react with the acidic functional groups, where (a) a solution rate in 3 mass % aqueous sodium hydroxide at 45&#xb0; C. is 0.95 or more after a heat history of 90&#xb0; C. for 10 minutes with the solution rate before the heat history assumed to be 1, (b) the solution rate in 3 mass % aqueous sodium hydroxide at 45&#xb0; C. ranges from 0.001 &#x3bc;m/sec to 0.02 &#x3bc;m/sec after the heat history of 180&#xb0; C. for 60 minutes, (c) a bleed-out amount is 50 mg/mor less in storing at 40&#xb0; C. for 2 weeks after the heat history of 180&#xb0; C. for 60 minutes, and (d) a thermogravimetric decrease at 260&#xb0; C. is 2.0% or less in measuring on a temperature rising condition of 10&#xb0; C./min from 40&#xb0; C. by thermogravimetric analysis (TG). When a multilayer flexible wiring board is manufactured using the resin composition, it is possible to obtain the resin layer excellent in alkali processability, embeddability in press, heat resistance, bendability, insulation reliability, and adhesion to the conductive layer.

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Tokyo, Japan

Yoro Sasaki