Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Isamu Taguchi

Takashi Shoji

Ryuji Monden

Yoshiaki Takahashi

Koro Shirane

Nobuyuki Nagato

Hideo Miyata

Kohei Morikawa

Yoshinori Shibuya

Kuniaki Shimbo

Nobutoshi Sasaki

Hitoshi Amita

Noriko Murase

Shunsuke Nagasaki

The present invention provides an organic polymer light-emitting element material having a gold complex structure as a part of the side chain or crosslinking group as represented by formulae (5) and (8) and an organic polymer light-emitting element comprising layer(s) comprising the organic polymer light-emitting element material. The present invention provides a polymer-based phosphorescent material useful for a multicolor or white light-emitting organic EL device having high luminous efficiency and capable of large-area formation and mass production. 

Organic polymer light-emitting element material having gold complex structure and organic polymer light-emitting element

An object of the present invention is to provide a fluorinated polymer of adequate molecular weight with excellent transparency in a wavelength range from visible to near infrared, and to also provide a method of producing such a polymer. The present invention provides a fluorinated polymer comprising a structure represented by a formula (1) as a structural unit, as well as a method of producing this polymer using a corresponding tetrafluoroxylylenediamine or a tetrafluoroxylylene glycol as a raw material.

Fluorinated polymer

A solder powder comprises solder particles having a distribution such that the number of particles having a particle diameter of 20 &#x3bc;m or less is 30% or less, wherein the oxygen content is 500 ppm or less. A flux for solder paste comprises an organic acid component consisting of an organic acid ester and an ester decomposer catalyst, an organic halogen compound, a reducing agent and a resin component. A solder paste mainly comprises a flux and a solder powder, wherein the water content of the solder paste is 0.5% by weight or less.

Flux for solder paste

A process of purifying L-ascorbic acid 2-phosphate is disclosed, comprising passing a solution containing L-ascorbic acid 2-phosphate through a column of a basic anion exchanger resin whose ion-exchange groups consist essentially of a primary amine group, a secondary amine group, a tertiary amine group or a mixture thereof, and eluting the L-ascorbic acid 2-phosphate with an aqueous solution of a mineral acid or an inorganic salt. L-ascorbic acid 2-phosphate can be isolated at a high efficiency through easy steps.

Process for purifying L-ascorbic acid 2-phosphate

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Chiba, Japan

Isamu Taguchi