Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Hitachi Chemical Company, Co.

Koichi Kamijima

Seiji Tai

Nobuyuki Hayashi

Mitsuo Katayose

Hideo Hagiwara

Takayuki Akimoto

Hiroyuki Tanaka

Akio Mukoh

Setsuo Kobayashi

Shigeru Hayashida

Seikichi Tanno

Takeshi Nojiri

Susumu Era

Hajime Kakumaru

Hideyasu Tsuiki

Takayuki Saito

Tohru Kikuchi

Toshiyuki Fujita

Yumiko Wada

Kazuyoshi Tendo

Tsutomu Mamiya

Teruo Yoshida

Makoto Murakami

Photosensitive resin composition, photosensitive film and process for preparing fluorescent pattern using the same

Disclosed are a photosensitive resin composition which comprises:

Photosensitive resin composition, photosensitive film and process for

An antifouling coating composition comprising a biodegradable polymer (A) comprising one or more constituent units (a) capable of imparting biodegradability such as derived from an alkyl vinyl ether, and one or more constituent units (b) derived from e.g. maleic anhydride, itaconic anhydride, or an unsaturated dicarboxylic acid monoester, and an antifouling agent is excellent in coating consuming properties, antifouling performance, biodegradability and other properties.

Coating varnish composition and antifouling coating composition

A coating composition comprising (A) a polymer obtained by polymerizing (a1) one or more unsaturated acid anhydrides or unsaturated carboxylic acids and (a2) one or more other unsaturated monomers copolmerizable therewith, and (B) at least one compound selected from one or both of (b1) a compound group comprising amino-acids, compounds having one or more carboxyl groups in the molecule, compounds having both hydrophobic group and hydrophilic group in the molecule, chelate compounds, hydroxyl- or acetyl-substituted carboxylic acid esters, ion-exchangeable layer clay minerals and powers of inorganic materials which have been made lipophilic with an organic material, and (b2) a group of compound which is crystallizable and selected from polyether compounds, polyester compounds, polyether-polyester compounds, olefinic glycol compounds, acrylic esters, methacrylic esters and polycarbonate compounds, is useful for preparing an antifouling coating composition by mixing with a copper compound.

Coating composition and antifouling paint

A naphthalocyanine derivative of the formula: ##STR1## wherein M, Y, R.sup.1, k, l, m, n are as defined in the specification, is an effective substance for forming a recording layer on a substrate of an optical recording medium having high sensitivity with good properties.

Naphthalocyanine derivatives, production thereof, optical recording

A coating varnish composition comprising (A) a polymer obtained by polymerizing (a) at least one unsaturated acid anhydride and (b) at least one other unsaturated monomer, and (B) at least one additive selected from triazole derivatives, benzothiazole derivatives, thiadiazole derivatives, polyethers and carboxylic acid anhydride derivatives, is capable of forming a coating which has no danger of poisoning like the organotin copolymers, shows a coating consuming property and antifouling performance comparable with those of the organotin copolymers and does not gel even when mixed with a copper compound.

A coating varnish composition comprising (A) a polymer obtained by polymerizing one or more unsaturated carboxylic acids (a) with one or more unsaturated monomers (b), and (B) at least one additive selected from triazole derivatives, thiadiazole derivatives, and benzothiazole derivatives, and an antifouling coating composition comprising (i) said coating varnish and (ii) an antifouling agent containing a copper compound as a major component, do not show a danger of organotin copolymers, but provide a coating excellent in coating consuming properties and antifouling properties for a long period of time without causing gelation when mixed with a copper compound.

Resin composition and antifouling paint

Special tetraazaporphins containing Si, Ge or Sn as the central metal are useful for forming a recording layer in an optical recording medium.

Tatraazaporphin, process for producing the same, as well as optical

1-(2,3-Dicarboxyphenyl)-3-(3,4-dicarboxyphenyl)-1,1,3,3-tetramethyldisiloxa ne dianhydride is useful as a curing agent for epoxy resins.

Tetracarboxylic acid dianhydride having disiloxane linkage and process

Tetraazaporphin, process for producing the same, as well as optical

2,3-dicyanonaphthalene derivatives useful in the synthesis of naphthalocyanine derivatives are disclosed. The 2,3-dicyanonaphthalene derivatives have the formula: ##STR1## wherein each R.sup.1 may be the same or different and represents an alkyl group, substituted alkyl group, or aryl group; and n is an integer from 1 to 4.

2,3-dicyanonaphthalene derivatives

A process for producing (i) a 1,3-bis(dicarboxyphenyl)disiloxane derivative represented by the general formula ##STR1## wherein Rs and R's independently of one another denote methyl or phenyl or (ii) a 1,3-bis(dicarboxyphenyl)-disiloxane derivative dianhydride represented by the general formula ##STR2## wherein Rs and R's are as defined above, the process comprising coupling a Grignard reagent of halo-o-xylene with a disubstituted halosilane represented by the general formula ##STR3## wherein R and R' are as defined above and X denotes halogen, to form a dimethylphenyl(disubstituted silane) represented by the general formula ##STR4## wherein R and R' are as defined above, hydroxylating the dimethylphenyl(disubstituted silane) to form a dimethylphenyl(disubstituted hydroxysilane) represented by the general formula ##STR5## wherein R and R' are as defined above, to form a 1,3-bis(dimethylphenyl)-disilane

Process for producing 1,3-bis(dicarboxyphenyl)-disiloxane derivative or

A naphthalocyanine derivative having as substituents at least one group of a formula: SR.sup.1 wherein R.sup.1 is --(CR.sup.2 R.sup.3).sub.x SiR.sup.4 R.sup.5 R.sup.6, in which R.sup.2 to R.sup.6 are H, alkyl groups, etc. is excellent in solubility in saturated hydrocarbon solvents and in absorption of semiconductor laser lights and thus, is suitable for producing optical recording media.

A naphthalocyanine derivative having at least one substituent of the formula: SO.sub.2 R.sup.1, wherein R.sup.1 is an alkyl group, a substituted alkyl group or an aryl group is excellent in ability to absorb diode laser beams and suitable for use in an optical recording medium.

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Hitachi, Japan

Koichi Kamijima