Asahi Kasei Kogyo Kabushiki Kaisha

Polyplastics Co., Ltd.

Minoru Akiyama

Kageyasu Akashi

Takeo Kimura

Tetsuo Shiga

Torao Ishida

Takeki Matsui

Yoshio Sakurai

Yoshinobu Ito

Shigeru Tsukagoshi

Yoshio Hayashi

Hidehiko Kobayashi

Koichi Yoshida

Hiroshi Hayashi

Shozo Kinoshita

Heiichiro Obanawa

Daikichi Nishimura

Yoshiharu Doi

Takashi Shirai

Osamu Kashihara

Tetsuo Siga

Kohji Ohishi

Ryuichi Sekita

Process for producing trioxane

An improved method for producing a microbial polyester comprising 3-hydroxybutyrate monomer units is disclosed, in which a strain belonging to the genus Alcaligenes is cultured in a liquid medium containing a carbon source selected from specific long chain fatty acids and derivatives thereof. The produced microbial polyester is useful in plastics and polymers which are free from environmental pollution problems, and in implanting materials and drug carriers, recovery of which is not necessary.

Method for producing a microbial polyester

A polyester having a high quality is produced by stirring its polycondensation reaction mixture in such a way that the stirring rate is reduced continuously in a stepwise manner corresponding to an increase in the melt viscosity as the reaction proceeds so that the stirring load is substantially constant after the viscosity of the reaction system has reached an arbitary value between 20 and 800 P until the completion of the reaction.

Process for producing polyester

A composite porous material comprising a particulate inorganic porous material and, contained in the pores of the material, an organic resin having a micro-void. The composite porous material has a surface area larger than that of the inorganic porous material. The composite porous material has a high dimensional stability comparable to that of an inorganic porous material while exhibiting a high separating and adsorbing capacity comparable to that of the conventional ion exchange resin or chelate resin. Therefore, it can advantageously be used as an adsorbent for various compounds or ions as well as a packing material for gas or liquid chromatography.

Composite porous material, process for production and separation of

A post-activation type dry image forming material comprising (I) a silver salt component reducible to free silver upon light exposure and including silver iodide; (II) a redox reactive composition capable of making a visual change by a redox reaction of said composition, said reaction being initiated by heating in the presence of free silver; (III) an oxidizing agent for free silver which has an oxidizing capacity for free silver but is rendered photosensitive by heating and which, upon light exposure after said heating, is suppressed with respect to the oxidizing capacity for free silver and capable of catalytically promoting the redox reaction of said composition; and (IV) a photoreactive oxidizing agent, upon light exposure, capable of returning the reduced oxidizing agent for free silver to the original state. A post-activation type dry image forming material which is extremely excellent in stability of the raw image forming material, that is, can be stored in a light room for a time as long as a period of the order of years and which has high sensitivity can, for the first time, be realized by the ingenious combination of components. The effect of the interaction between the components, especially between the components (I), (III) and (IV) is noticeable in imparting to the present image forming material an extremely high stability of the raw image forming material.

Post-activation type dry image forming material

A novel heat-activatable and heat-developable dry image forming material comprising (a) a silver salt of long chain fatty acid with at least 16 carbon atoms, (b) a reducing agent for silver ions, (c) a silver halide component including silver iodide or a silver halide-forming component including silver iodide-forming compound, (d) an oxidizing agent for free silver, (e) a photoreactive halogeno oxidizing agent, (f) a binder, and (g) a specific spectral sensitizing dye has been found to have improved spectral sensitivity as well as excellent storage stability.

A process for preparing a silver salt of an organic carboxylic acid comprising reacting an alkali metal salt of the organic carboxylic acid with a water-soluble silver salt, and wherein there is used as the reaction solvent a mixture consisting of at least one water-soluble or partially water-soluble C.sub.3 -C.sub.8 alcohol and water and having a mixing volume ratio of 1/5 to 5/1. The silver salt of the organic carboxylic acid prepared in high yield according to the process of the present invention is in uniformly finely divided form of high purity and suitable for use in photographic materials.

Process for preparing silver salt of organic carboxylic acid

A novel dry image forming material comprising (a) a non-photosensitive organic silver salt oxidizing agent, (b) a reducing agent for silver ions, (c) a photosensitive silver halide or a photosensitive silver halide-forming component capable of forming a photosensitive silver halide by the reaction thereof with said organic silver salt oxidizing agent, and (d) a substituted 3-pyrazolin-5-one. The dry image forming material has improved sensitivity and storage stability of the raw image forming material and can form thereon an excellent black tone image.

Dry image forming material

A heat developable photosensitive material comprising:

Heat developable photosensitive materials

Compounds represented by formula (I) ##STR1## wherein one of Z.sub.1 ', Z.sub.2 ', Z.sub.3 ' and Z.sub.4 ' represents R, another one of Z.sub.1 ', Z.sub.2 ', Z.sub.3 ' and Z.sub.4 ' represents Z, and the remaining two moieties of Z.sub.1 ', Z.sub.2 ', Z.sub.3 ' and Z.sub.4 ' represents a hydrogen atom and/or a protective group, one of R and Z represents A.sub.1 and the other represents A.sub.2, A.sub.1 being an acyl group having 14 to 22 carbon atoms which does not contain a carboxylic group and A.sub.2 being an acyl group having 2 to 14 carbon atoms and having one carboxyl group, X represents a hydrogen atom or a halogen atom (hereinafter referred to as Compound Ia); a 2,2'-anhydro product of Compound Ia wherein Z.sub.2 ' represents a hydrogen atom (hereinafter referred to as Compound Ib); an arabinosylation product of Compound Ia (hereinafter referred to as Compound Ic); a deamination product of Compound Ia (hereinafter referred to as Compound Id); a 2'-deoxy product of Compound Id wherein Z.sub.2 ' represents a hydrogen atom (hereinafter referred to as Compound Ie); a salt of Compound Ia, Ib, Ic, or Id or Ie having an A.sub.2 group with a base (hereinafter referred to as Compound If); and a salt of Compound Ia, Ib or Ic wherein Z.sub.1 ' represents a hydrogen atom with an acid (hereinafter referred to as Compound Ih); and processes for preparing the same.

Diacylnucleosides and process for preparing the same

A nucleotide derivative represented by the general formula: ##STR1## wherein R represents an acyl group having 14 - 22 carbon atoms and having an aliphatic acyl moiety; X represents a hydrogen atom, a halogen atom, an alkyl group having 1 - 4 carbon atoms, or a trifluoromethyl group; and at least one, but not all, of Y.sub.1, Y.sub.2, and Y.sub.3 represents a phosphate, a pyrophosphate, a triphosphate, or a salt thereof, the balance of Y.sub.1, Y.sub.2 and Y.sub.3 representing a hydroxyl group; or in case of ribosyl, Y.sub.1 and Y.sub.3, or Y.sub.2 and Y.sub.3 represent, at the same time, the aforesaid phosphate, pyrophosphate, triphosphate or salt thereof and the remaining group of Y.sub.1, Y.sub.2 or Y.sub.3 represents a hydroxyl group; or in case of arabinosyl, Y.sub.1 and Y.sub.2, or Y.sub.2 and Y.sub.3 represent, at the same time, the aforesaid phosphate, pyrophosphate, triphosphate or salt therof and the remaining group of Y.sub.1, Y.sub.2 or Y.sub.3 represents a hydroxyl group. The nontoxic salts of these phosphates are useful as an antileukemialagent for mice which is soluble in water and has high stability.

Cytidine nucleotide derivatives

N.sup.4 -Acyl-1-.beta.-D-arabinofuranosylcytosine-5'-esters represented by the formula ##STR1## wherein R.sup.1 represents an acyl group having 3 to 28 carbon atoms and R.sup.2 represents an XCH.sub.2, XCH.sub.2 CH.sub.2 or CH.sub.3 CHX group, wherein X represents a halogen atom, a (CH.sub.3).sub.2 N or (C.sub.2 H.sub.5).sub.2 N group.

N.sup.4 Acyl-1-arabinofuranosylcytosine-5'-esters

An N.sup.4 -acyl-1-.beta.-D-arabinofuranosylcytosine having the following formula ##SPC1## Wherein R is an aliphatic acyl group having 3 to 35 carbon atoms. The compounds of this invention are useful as a cancer chemotherapeutic agent for controlling tumors, e.g., in mice, an insecticide, and a fungicidal surface active agent.

Growing community of inventors

Fuji, Japan

Minoru Akiyama