Teijin Limited

Kazuyoshi Suzuki

Takeo Shima

Hiroo Inata

Shoji Kawase

Takatoshi Kuratsuji

Akihiro Horike

Takanori Urasaki

Teruo Takahashi

Tadashi Shingu

Kiyomi Naka

Takayuki Kobayashi

Isao Oka

An improved support comprising (A) a base plate and (B) an adhesive layer formed on the surface of the base plate is provided for making a printing plate from a liquid photosensitive resin. The improvement resides in the inclusion of a tertiary phosphite or tertiary phosphine in the adhesive layer. The improved adhesive layer acts to give reliefs of a good shoulder shape, and this action can be retained over long periods of time. In an alternative embodiment, an activating layer (C) containing a tertiary phosphite or tertiary phosphine is formed on the adhesive layer.

Supports for printing plates

A process for preparing polyesters, which comprises reacting (A) a difunctional carboxylic acid component containing at least 50 mol% of a naphthalene dicarboxylic acid and/or its ester-forming derivative, (B) a diol component containing an aromatic group and at least 50 mol% of a 4,4'-bis-(.omega.-hydroxyalkoxy)diphenylsulfone and (C) an aliphatic or alicyclic diol component, the molar ratio of component (B) to component (A) being 0.05-1, and the molar ratio of the sum of components (B) and (C) to component (A) being 1.1-3.0; and then polymerizing the resulting reaction product in the presence of a catalyst while distilling off the excess of the component (C) out of the reaction system, thereby to form a polymer having a reduced viscosity of at least 0.5.

Polyesters of naphthalene carboxylic acids and hydroxy alkoxydiphenyl

According to this invention, during the formation of a fiber-forming polyester by the reaction of a dicarboxylic acid or its functional derivative with a glycol, an aromatic ortho-ester such as hexaphenyl ortho terephthalate is added to the molten polyester whereby a fiber-forming polyester of a low content of free carboxyl groups and diethylene glycol units is prepared. Moreover, the reaction rate of the polycondensation is greatly increased by selecting and using a suitable aromatic ortho-ester and thus there can be obtained a fiber-forming polyester of a very high molecular weight.

Process for preparation of polyesters

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Iwakuni, Japan

Kazuyoshi Suzuki