Nippon Shokubai Co., Ltd.

Other

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Oji Paper Co., Ltd.

Masatoshi Yoshida

Masuji Izubayashi

Nobuhiro Kobayashi

Toshiaki Matsunaga

Yoshikuni Mori

Kenji Minami

Teruo Kikuta

Shiro Nakano

Hiroaki Hasegawa

Hidetoshi Hatta

Kohei Hori

Hiroshi Yamamoto

Kenji Kadonaga

Hirotama Fujimaru

Masazumi Sasabe

Hiroki Inoue

Tadahiro Yoneda

Toshiya Takagi

Tsuneo Tsubakimoto

Kenichi Ueda

Tatsuhito Matsuda

Toshimi Aoyama

Yasutaka Nakatani

Kiyoshi Kawamura

Hideaki Nagano

Masahiro Yoshida

Hiroyuki Ishida

Takahiro Aoyama

Akiko Mitsuhashi

Yasumasa Tanaka

Hirokazu Itoh

Kazutomo Takahashi

Tomomasa Kaneko

Minoru Yamaguchi

Hideo Asano

Katsuyuki Kono

Nobuaki Otsuki

Yohei Murakami

Shigeru Tanimori

Masaya Uchida

Hisakazu Shindou

Mitsuo Nakazaki

Ichiro Namura

Ryoichi Oshiumi

Akikazu Banba

Shingo Kataoka

Manabu Nishida

Shiro Sugiura

Koji Kahara

A curable resin obtained by reacting a polybasic anhydride with a reaction product of an epoxy resin with a phenol compound having an alcoholic hydroxyl group and an unsaturated monobasic acid, wherein an epoxy resin having a softening point of 93&#xb0; C. or higher is used as the epoxy resin.

Curable resin and producing process therefor

The present invention provides: a photosensitive resin composition, which can form uniform coating films having higher coating film strength without causing surface contamination, decrease of evenness of coating films, decrease of film thickness, and coloring by decomposition in heat treatment of subsequent steps, and has good sensitivity of exposure. The photosensitive resin composition comprises a lactone-ring-containing polymer (A) as an essential component, wherein: the lactone-ring-containing polymer (A) is obtained by carrying out polymerization of comonomers and lactonization at the same time wherein the comonomers include a 2-(hydroxyalkyl)acrylate ester and an acidic-group-containing monomer; and the lactone-ring-containing polymer (A) is obtained by almost quantitatively carrying out lactonization of a 2-(hydroxyalkyl)acrylate ester structural unit.

Photosensitive resin composition, its use, lactone-ring-containing polymer, and production process therefor

A method for the production of a porous cross-linked polymer material by the polymerization of an HIPE containing a cross-linking agent, characterized by the fact at least one species of the cross-linking agent is a compound having a double bond equivalent f not less than 120 g/mol. The cross-linking agent is preferred to be a compound possessed of an alkylene oxide moiety or a vinyl polymer containing not less than two polymerizing double bonds in the molecular unit. Thus, it is made possible to produce a porous cross-linked polymer material excellent in absorbency and flexibility, permit the HIPE to be polymerized in a short time, and therefore improve the efficiency of production.

Method for production of porous cross-linked polymer material

Protolytically leaving group-containing copolymer and process for its production

The present invention provides a new star-shaped block copolymer and a production process therefor, wherein the new star-shaped block copolymer has high heat resistance despite having a low viscosity. It has been found that a new star-shaped block copolymer has high heat resistance wherein the new star-shaped block copolymer comprises a plurality of star-shaped structures,in which at least three chain polymer segments,are radially extended from a central polyvalent mercaptan segment,, wherein the star-shaped structures,are bonded to each other through a bonding structure,at their chain polymer segments. In addition, in a production process for a star-shaped block copolymer comprising the multistep radical polymerization in the presence of a polyvalent mercaptan wherein the elementary steps of the multistep radical polymerization differ in polymerizable monomers as used therein, the improvement according to the present invention is characterized in that at least one of the elementary steps of the multistep radical polymerization involves the joint use of a polyfunctional monomer with the polymerizable monomer.

Star-shaped block copolymer and production process therefor

The present invention provides a photosensitive resin composition which comprises an urethane resin obtained by reacting (A) a carboxyl group-containing polymer having an acid value of 30 mg KOH/g or more and a glass transition temperature of 30&deg; C. or more, (B) a compound having two isocyanate groups in one molecule, (C) a compound having two hydroxyl groups in one molecule and (D) a photopolymerizable unsaturated monomer having one hydroxyl group in one molecule, and a photopolymerization initiator, and a resin plate for flexography using the photosensitive resin composition, whereby the photosensitive resin composition having water developing properties, high in sensitivity and impact resilience, and excellent in water resistance, ink resistance and press life of a hardened portion forming a line pattern area of a printing plate material and the resin plate for flexography prepared by the use of the photosensitive resin composition can be provided.

Photosensitive resin composition and flexographic resin plate

The invention provides a thermally reversible crosslinked matter, which displays a sufficiently low melt viscosity during heating and is also excellent in the stability of the melt viscosity, and further provides a hot melt resin comprising this crosslinked matter. The thermally reversible crosslinked matter comprises a compound (A)-based moiety and a compound (B)-based moiety, wherein both moieties are bonded to each other through a crosslinked structure, which is characterized in that: the crosslinked structure includes a structure making steric hindrance, and breaks due to heating and then reverts due to cooling; and when the crosslinked structure breaks due to heating, the melt viscosity of the thermally reversible crosslinked matter decreases to not higher than twice the melt viscosity of compound (A) alone or the melt viscosity of compound (B) alone, whichever is higher, as heated at the same temperature that the thermally reversible crosslinked matter is heated at.

Thermally reversible crosslinked matter and its use

An inexpensive block polymer which is effectively available in various uses with regard to hot-melt resin compositions, pressure sensitive adhesives, carriers for pressure sensitive adhesives, and the like. This block polymer has a structure including a polyvalent mercaptan segment at its center from which two or more polymer segments are radially extended. The number-average molecular weight of this polymer is in a range of 2,000 to 1,000,000, and the two or more polymer segments have two or more different compositions. This block polymer is obtainable by a process including two or more steps of radical polymerization of polymerizable monomer components having different compositions using a polyvalent mercaptan as a polymerization initiator.

Block polymer thermoplastic addition polymer and their production

An unsaturated aldehyde expressed by Formula (I) below is hydrated with a solution in the presence of a carboxylic-acid-based resin having of a structure expressed by Formula (II) below: ##STR1## where R represents one of a hydrogen atom and a hydrocarbon group having up to five carbons; ##STR2## where R.sub.1 and R.sub.2 respectively represent a hydrogen atom, hydrocarbon group having up to five carbons, or --(--CH.sub.2 --).sub.p1 --X group, p.sub.1, k.sub.1, and m.sub.1 respectively represent an integer from zero to six, n.sub.1 represents an integer from one to six, Y.sub.1 represents --O--, --S--, or --NR.sub.3 --, R.sub.3 represents a hydrogen atom or hydrocarbon group having up to five carbons, and X represents a carboxylic-acid-based resin main body. Using a heat-resistant catalyst as above makest it possible to increase the reaction rate by heating, and produce hydroxyalkanal at high selectivity and yield out of an industrially advantageous high-concentration unsaturated aldehyde solution.

Process of producing hydroxyalkanal

An epoxy resin composition which is tough and has excellent heat resistance and adhesion is obtained by dispersing, in an epoxy resin, polymer particles with a glass transition temperature of lower than 20.degree. C. obtained by emulsion polymerization of a (meth)acrylic acid ester monomer by using, as an emulsifier, an end alkyl group-containing polymer with an acid value of greater than 200 or a salt thereof obtained by polymerization of a polymerizable monomer containing an unsaturated carboxylic acid in the presence of an alkyl mercaptan. The epoxy resin composition is useful, for example, as adhesives, molding materials, paints, sealants.

(Meth)acrylate polymer particles dispersed in epoxy resin

Block polymer, thermoplastic addition polymer, and their production

The present invention provides an acrylic polymer containing no surfactant, having little limitation in the polymer composition and being superior in heat resistance, processing operation performance and fluidity, and also provides use of the polymer and a production process. An acrylic polymer of present invention is obtained by the bulk polymerization, contains an acrylic acid-based monomer unit as a main component in its structure and has a Mn of 1,000 to 1,000,000, a glass transition temperature of -80.degree. C. or higher and a Mw/Mn ratio of 5 or less, and is appropriate for acrylic rubber, a pressure-sensitive adhesive, an alkali-soluble adhesive, an alkali-soluble film, an alkali-soluble injection molding or water ink. This polymer is produced by, in the presence of an inactive gas, carrying out the bulk polymerization of a starting material which contains a monomer component having an acrylic acid-based monomer as a main component and contains a sulfur compound of 0.001 to 20 parts by weight based on 100 parts by weight of the monomer component, and contains a polymerization initiator in the weight of one-third or less based on the sulfur compound.

Acrylic polymer, its use and process for producing it

Disclosed herein are crosslinked spherical fine particles having good toughness, elastic properties, and chemical properties, and a process for producing the same, said fine particles being obtained by radical polymerization in the suspended state of a component [M] capable of radical polymerization containing a vinyl group-containing compound (V) capable of radical polymerization which is obtained by reaction of (a) a selected polyol, (b) an isocyanate group-containing compound, and (c) an active hydrogen-containing vinyl monomer capable of radical polymerization. Also disclosed herein are the secondary products of the crosslinked spherical fine particles, which include a coating composition and its derivatives (such as filmlike article, sheetlike article, adhesive filmlike article, and adhesive sheetlike article) and a peelable pressure-sensitive adhesive and peelable pressure-sensitive adhesive article.

Coating compositions containing crosslinked spherical fine particles

A thermosensitive recording material comprising a recording layer formed on a substrate and a coating film layer formed thereon, wherein the recording layer is of a bilayer structure composed of a first thermosensitive layer on the side of the lower layer and a second thermosensitive layer on the side of the upper layer and particles are dispersed in at least one of the first and second thermosensitive layers. An original plate for lithographic printing can be produced from a combination of an ink-philic resin and an ink-repelling resin as the compositional materials of such thermosensitive layers. Besides, thermosensitive, recording materials for magnetic recording, thermosensitive materials for electrostatic recording, thermosensitive recording materials for colored image recording and the like, can be generated through a variety of modifications of the compositional materials. Then, the use of such thermosensitive recording materials attains thermosensitive recording at a higher precision through simple processes and procedures.

Thermosensitive recording material and thermosensitive recording method

The present invention yields a coating film excellent in adhesion, water resistance, solvent resistance and durability. A compound having a carboxyl group and a long-chain alkylthio group or a salt thereof is used as an emulsifier and emulsion polymerization is carried out using a polymerizable monomer or monomers having, within their molecule, a group reactive with a carboxyl group as raw materials for emulsion polymerization, whereby the resin produced by emulsion polymerization and the emulsifier react with each other efficiently on the occasion of film formation and form a crosslinked structure. When a compound having a polymerizable unsaturated group in addition to the carboxyl group and long-chain alkylthio group or a salt thereof is used as the emulsifier, not only the above-mentioned crosslinked structure is formed but also the polymerizable unsaturated group in the emulsifier will react with the unsaturated group in the polymerizable monomer or monomers in the manner of grafting. As a result, the compatibility between the emulsifier and the emulsion-polymerized resin is improved.

Aqueous crosslinkable resin dispersions, method of their production and

Growing community of inventors

Nara, Japan

Masatoshi Yoshida