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Photosensitive Polyamic Acids Developable with Aqueous Alkaline Solutions

Published online by Cambridge University Press:  15 February 2011

Jun Tanaka
Affiliation:
Production Engineering Research Laboratory, Hitachi, Ltd., Totsuka-ku, Yokohama 244, Japan
Haruhiko Kikkawa
Affiliation:
Production Engineering Research Laboratory, Hitachi, Ltd., Totsuka-ku, Yokohama 244, Japan
Fusaji Shoji
Affiliation:
Production Engineering Research Laboratory, Hitachi, Ltd., Totsuka-ku, Yokohama 244, Japan
Hidetaka Satou
Affiliation:
Yamazaki Works, Hitachi Chemical Co., Ltd., 4-chome, Higashi-cho, Hitachi-shi 317, Japan
Fumio Kataoka
Affiliation:
Production Engineering Research Laboratory, Hitachi, Ltd., Totsuka-ku, Yokohama 244, Japan
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Abstract

New negative-type photosensitive polyamic acids, precursors of polyimides, developable with aqueous alkaline solutions were synthesized. Among diamine monomers having a photofunctional group, 2′-(methacryloyloxy)ethyl 3,5-diaminobenzoate yields high molecular weight polyamic acids. A photosensitive polymer composition consisting of Michler's ketone and a thermally stable peroxide, 3,3′,4,4′-tetrakis(t-butyldioxycarbonyl)-benzophenone, results in high photosensitivity. The photosensitive coating of the composition is soluble in aqueous alkaline solutions as well as in organic aprotic polar solvents and either can be used as a developer of the coating. However, resolution of the patterns is quite different especially with thick films. Solvent developers result in poor resolution whereas aqueous alkaline developers give patterns of high aspect ratio even with thick films. This is probably due to the difference in the diffusion efficiency and swelling property of the polymer to the developers.

Effects of copolymerizing with an ordinary diamine monomer on photosensitivities and film properties of the polyimides derived from their precursors are also discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1993

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References

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4. Kataoka, F., Shoji, F., and Kojima, M., Proceedings of Polymeric Materials: Science and Engineering, 66, 239 (1992).Google Scholar
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