Sumitomo Chemical Company, Limited

Toshiya Inoue

Shigeo Hozumi

Kayoko Ueda

Hajime Kuwahara

Koji Baba

Masakazu Shirakawa

A practically excellent method for preserving a photosensitive composition Containing a photopolymerization initiator and a photopolymerizable monomer and/or oligomer, which comprises placing and preserving the photosensitive composition in a light shielding vessel, wherein the product of the void ratio (%) in the vessel and the oxygen partial pressure (hPa) in the void part is 1500 (%&middot;hPa) or more is provided; and the method imparts remarkably improved preservation stability.

Method of preserving photosensitive composition

An electromagnetic shield plate comprising a geometric pattern having a line width of 10 &mgr;m to 80 &mgr;m and a line interval of 50 to 250 mesh on a surface of a transparent substrate, provides good visibility and excellent electromagnetic shielding, and is easy to manufacture and permits the fabrication of a large-size plate in a simple manner.

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Toyonaka, Japan

Toshiya Inoue