Nippon Shokubai Co., Ltd.

Yoko Matsui

Kozo Tajiri

Junichi Nakamura

Yasunori Tsujino

Tomomi Makino

Go Masuda

Ai Matsumoto

Tatsushi Hirauchi

Keiko Ando

Shinpei Sato

The invention aims to provide a method by which a solution of polyimide can be easily obtained. Further, the invention aims to provide a fluorinated polyimide solution by which fluorinated polyimide excellent especially as an optical material and an electronic functional material can easily be produced. The production method of the soluble polyimide solution according to invention is characterized by mixing a mixture containing a polyamide acid, a cyclodehydration reagent, and a solvent by a rotation-revolution mixing method. Further, the fluorinated polyimide solution of the invention is a solution of polyimide defined by the following formula (II): wherein, X and Y independently represent divalent organic groups; Z represents chlorine atom, bromine atom, or iodine atom; p represents an integer of 1 to 3; q represents an integer of 0 to 2; and p+q=3.

Production method of polyimide solution and fluorinated polyimide solution

The present invention provides a light selective transmission filter which selectively shields light and has a high transmittance of light at a specific wavelength such as visible rays, and which has a sufficiently reduced thickness and excellent heat resistance. The present invention further provides a lens unit including such a light selective transmission filter. The light selective transmission filter selectively reducing a transmittance of light has a thickness of less than 200 &#x3bc;m and includes a base material containing a functional film with reflow resistance. The lens unit includes such a light selective transmission filter and a lens.

Light selective transmission filter

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Tsukuba, Japan

Yoko Matsui