Hitachi Chemical Company, Ltd.

Hitachi Chemical Dupont Microsystems, Ltd.

Nori Sasaki

Shigeru Hayashida

Hidetaka Sato

Masato Taya

Chiaki Yamagishi

Dai Kawasaki

Noriyuki Yamazaki

Shigeo Nara

Nagatoshi Fujieda

Naoki Okuda

Gouki Ohtake

Kazuhiro Ishibashi

Keijirou Honda

A method of evaluating the dissolution rate of a polyimide by Raman spectroscopy, wherein the Raman spectral intensity I(a) of imide groups contained within the polyimide is measured, and I(a) is then compared with the Raman spectral intensity I(b) of imide groups contained within a polyimide with a known dissolution rate. The polyimides are preferably obtained using an aromatic tetracarboxylic dianhydride and/or an aromatic diamine.

Method of evaluating polymide dissolution rate, method of producing polymide, and polymide obtained using same methods

A photosensitive resin composition includes (a) a polymer mainly composed of a repeating unit represented by the following general formula (I); (b) a dissolution accelerator for a developing solution; and (c) a solvent: wherein Ris a trivalent or tetravalent organic group, Ris a bivalent organic group, R is a monovalent organic group having a carbon-carbon unsaturated double bond or a group represented by OM(Mrepresents a hydrogen ion or a cation composed of hydrogen and a compound having the carbon-carbon unsaturated double bond) in which the compound having the carbon-carbon unsaturated double bond is ionically bonded, at least one carbon-carbon unsaturated double bond is contained in all repeating units, m is an integer of 2 or more, and n is 1 or 2.

Photosensitive resin composition, pattern forming method and electronic parts using the photosensitive resin composition

Polyimides satisfying the requirements (a), (b) and (c) among the requirements described below, polyimides satisfying the requirements (b), (c) and (d), and polyimides satisfying the requirements (a), (b), (c) and (d) are excellent in transparency, isotropy and resistance to cracking (no crack is formed in the formation of a multilayer film, so that the multilayer formation is easy, namely, the polyimides are good in processability) and can give optical parts excellent in optical characteristics:

Polyimides and optical parts obtained by using the same

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Hitachi, Japan

Nori Sasaki