Nippon Shokubai Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Nippon Shokubai Kagaku Kogyo Kabushiki Kaisha

Nippon Shokubai

Kenji Minami

Mitsuo Kushino

Kenji Kadonaga

Yoshikuni Mori

Nobuaki Urashima

Masuji Izubayashi

Yoshinori Sano

Hayato Ikeda

Kozo Nogi

Kinya Nagasuna

Hirotama Fujimaru

Yoshihiro Arita

Kiyoshi Kawamura

Shigeru Tanimori

Hiroshi Yamazaki

Masazumi Sasabe

Masatoshi Yoshida

Katsuhiko Sakamoto

Youhei Murakami

Hiroshi Itoh

Hiroya Kobayashi

Takashi Namba

Akiko Mitsuhashi

Koichi Yonemura

Hiroyuki Ishida

Kazutomo Takahashi

Toshiaki Kuriyama

Yasumasa Tanaka

Masaya Uchida

Hidetaka Yatagai

Ichiro Namura

Masashi Yukitake

Iwao Fujikawa

Iwao Fukikawa

Hayato Ideda

This invention, with the object of producing a porous polymer from a water-in-oil type high internal phase emulsion, provides a method for the production of a porous polymer comprising a step of applying a physical treatment such asshaving to the surface of a porous polymer obtained by polymerizing the emulsion. By the physical treatment, it is made possible to diminish the difference in texture between the surface part and the inner part of the porous polymer and improve efficiently the absorption property of the porous polymer.

Process for producing porous polymer

A method of production is provided which is capable of efficiently producing in a very short period of time a porous polymer possessing a uniform foam structure and truly excelling in absorption properties and physical properties. It is a method for the production of a porous polymer, characterized by comprising (a) an emulsifying step for forming a water-in-oil type high internal phase emulsion (HIPE) by mixing and stirring an oil phase containing a polymerizing monomer component and a surfactant as essential components, (b) a shaping step for shaping the HIPE in a specific form, and (c) a polymerizing step for polymerizing the shaped HIPE and controlling the temperatures of the emulsion at the component steps (a)-(c) so that they may not produce a change exceeding 10&deg; C. or controlling all the component steps so that they may proceed at temperatures of not lower than 80&deg; C.

This invention concerns a method for the production of a porous polymer from a water-in-oil type high internal phase emulsion (HIPE). By using an oil-soluble polymerization initiator as the polymerization initiator, the method for producing a porous polymer with outstanding characteristics in a very short period even when the porous polymer is produced from an HIPE exhibiting a viscosity of not more than 500 mPa second at the emulsion formation temperature or when the porous polymer to be produced possesses a number-average pore diameter of not less than 80 &mgr;m is provided.

An object of this invention is to provide a method for the production of a porous cross-linked polymer, which permits the polymerization (curing) of a water in oil type high internal phase emulsion (HIPE) in such an exceptionally brief time as not more than 30 minutes, preferably not more than 10 minutes without impairing the stability of the HIPE. The object of this invention mentioned above can be accomplished by a method for the production of a porous cross-linked polymer which comprises steps of mixing an oil phase containing a polymerizing monomer, a cross-linking monomer, and a surfactant as essential components with a water phase containing water as an essential component thereby obtaining a water in oil type high internal phase emulsion and heating said emulsion to a prescribed curing temperature thereby polymerizing the emulsion, wherein said emulsion is formed in a thickness of not more than 50 mm and the temperature-increasing rate of the emulsion is not less than 5&deg; C./minute.

Method for production of porous cross-linked poymer

Method for production of porous cross-linked polymer

A polymer, a process for producing the same, and the use thereof. The polymer comprises structural units derived from an .alpha.,.beta.-unsaturated carboxylic acid monomer and structural units derived from another vinyl monomer, the polymer having (1) an acid value of 50 mgKOH/g or higher, (2) when analyzed with a differential scanning calorimeter, a differential curve having at least one peak top in each of the range of from -80 to 20.degree. C. and the range of from 20 to 120.degree. C., and (3) a parallel-ray transmittance of 80% or higher.

Polymer with high acid value from unsaturated carboxylic acid and vinyl

A process for producing a high-molecular-weight polydioxolane, which includes the steps of: polymerizing 1,3-dioxolane using a polymerization catalyst comprising a heteropolyacid and a ketone; and neutralizing the resulting polymerization reaction product using an organic amine and/or ammonia. A hydrophilic film, which includes a resin including a polydioxolane and having a particular molecular weight and has a particular crystallinity and a particular spherulite's size. A film crumbly in cold water is produced by forming a film under particular forming conditions from a resin including a polydioxolane and having a particular molecular weight, or by subjecting an already formed film to particular thermal hysteresis.

Production process for making high molecular weight polydioxolane

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

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

A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon black. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transfer, coating agent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.

Carbon black-graft polymer, method for production thereof, and use

Colored microfine globular particles are produced by causing carbon black to react with a polymer capable of reacting with the carbon black thereby forming a carbon black-graft polymer, dispersing this carbon black-graft polymer in a polymerizable monomer component, and then polymerizing the polymerizable monomer component. These particles, in the unmodified form, are usable as a toner for the development of images of static charge and, in a form incorporated in a varying component, are usable such as in resin composition, coating composition, thermosensitive transfer ink ribbon coating agent, thermosensitive transfer ink, or back-coating agent for magnetic recording medium.

Colored microfine globular particles, method for production thereof, and

A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon balck. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transer, coating gent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.

Colored microfine globular particles, method for production thereof and

A thermosetting resin decorative laminated sheet faced with a resin-impregnated sheet layer obtained by impregnating a sheetlike material with a resin composition containing an amino resin (I) produced by the reaction of formaldehyde with an amino compound (A) having as an essential component thereof at least one carboguanamine (a) selected from the group consisting of cyclohexanecarboguanamine and norbornanecarboguanamine and curing the resultant impregnated sheetlike material excels in flexibility, crack resistance, light resistance, and chemical resistance. A decorative overlaid plywood enjoying similarly desirable properties is obtained by integrating the aforementioned sheet layer with a substrate.

Decorative laminated sheet and decorative overlaid plywood faced with

A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon black. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transer, coating gent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.

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Otsu, Japan

Kenji Minami