Patents by Inventor Shinichi Ishikura
Shinichi Ishikura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5705559Abstract: Disclosed is a process for preparing crosslinked resin particles which comprises dispersing a resin having both a water-dispersible function and a self-crosslinkable function in one molecule in an aqueous medium and then three-dimensionally crosslinking.Type: GrantFiled: February 21, 1995Date of Patent: January 6, 1998Assignee: Nippon Paint Co., Ltd.Inventors: Hiroyuki Sakamoto, Kenshiro Tobinaga, Yasuyuki Tsuchiya, Hisaichi Muramoto, Yusuke Ninomiya, Keizou Ishii, Shinichi Ishikura
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Patent number: 5494769Abstract: The present invention provides a polyurea-covered particle having a narrow particle size distribution, which comprises a vinyl polymer particle as a seed particle and a polyurea cover layer formed on the vinyl polymer particle. The present invention also provides a process for producing the polyurea-covered particle having a narrow particle size distribution, which comprises:dispersing vinyl polymer particles having a narrow particle size distribution in an aqueous medium,adding thereto a polyisocyanate compound to swell the vinyl polymer particles, andadding a polyamine compound to effect interfacial polymerization.Type: GrantFiled: January 10, 1994Date of Patent: February 27, 1996Assignee: Nippon Paint Co., Ltd.Inventors: Naoya Yabuuchi, Shinichi Ishikura
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Patent number: 5470539Abstract: Polymer particles having a small particle diameter and a narrow particle diameter distribution are obtained by a continuous polymerization method which does not accompany an increase of cohering products attaching to an inner face of a reaction vessel and an air-bubble invasion and, in which stirring of a material solution for polymerization is easy. An emulsion polymerization reaction or a suspension polymerization reaction is carried out by supplying a material solution for polymerization continuously to a clearance between coaxial double cylinders, which have stretched toward a direction crossing a horizontal plane, from the end side of the cylinders, by rotating at least one of the double cylinders round the axis and thereby, causing Taylor vortices. The polymer particles thus-formed are obtained by through from the other end side of the double cylinders to the outside.Type: GrantFiled: March 30, 1994Date of Patent: November 28, 1995Assignee: Nippon Paint Co., Ltd.Inventors: Tsuyoshi Imamura, Katsumi Mizuguchi, Yasuhiro Shibai, Keizou Ishii, Shinichi Ishikura, Koichi Saito
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Patent number: 5340891Abstract: Polymer particles having a small particle diameter and a narrow particle diameter distribution are obtained by a continuous polymerization method which does not accompany an increase of cohering products attaching to an inner face of a reaction vessel and an air-bubble invasion and, in which stirring of a material solution for polymerization is easy. An emulsion polymerization reaction or a suspension polymerization reaction is carried out by supplying a material solution for polymerization continuously to a clearance between coaxial double cylinders, which have stretched toward a direction crossing a horizontal plane, from the end side of the cylinders, by rotating at least one of the double cylinders round the axis and thereby, causing Taylor vortices. The polymer particles thus-formed are obtained by through the other end side of the double cylinders to the outside.Type: GrantFiled: November 29, 1993Date of Patent: August 23, 1994Assignee: Nippon Paint Co., Ltd.Inventors: Tsuyoshi Imamura, Katsumi Mizuguchi, Yasuhiro Shibai, Keizou Ishii, Shinichi Ishikura, Koichi Saito
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Patent number: 5302654Abstract: Polymer microparticles having immobilized therein a water-insoluble substance such as oil-soluble dyes or pigments are produced by a method which includes the steps of forming droplets of a solution of a self-emulsifiable resin in a nonaqueous solvent containing the water-insoluble substance and an ethylenically unsaturated monomer suspended in an aqueous medium, and then allowing the monomer in the droplets to polymerize in situ.Type: GrantFiled: March 2, 1993Date of Patent: April 12, 1994Assignee: Nippon Paint Co., Ltd.Inventors: Keizo Ishii, Hidetsumu Okada, Masanori Oiwa, Hisaichi Muramoto, Shinichi Ishikura
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Patent number: 5284881Abstract: Disclosed is composite hollow particles which are excellent in solvent resistance and mechanical stability and have strong walls and which can be easily synthesized. The composite hollow particles are prepared by uniformly dispersing the following ingredients in an aqueous medium;(a) an ethylenically unsaturated monomer having at least two radical polymerizable double bonds in one molecule,(b) another polymerizable monomer which is different from the monomer (a),(c) organic particles having an average particle size of 0.01 to 5 micrometer,(d) a initiator, and(e) a dispersant,and then dispersion-polymerizing.Type: GrantFiled: October 15, 1992Date of Patent: February 8, 1994Assignee: Nippon Paint Co., Ltd.Inventors: Katsumi Mizuguchi, Koichi Saito, Shinichi Ishikura
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Patent number: 5204221Abstract: Disclosed is a photosensitive resin composition which has improved water developability and storage stability. The composition comprises(I) crosslinked resin particles prepared by a post-emulsion method from(a) a base resin having a glass transition temperature (Tg) of 0.degree. C. or less and a polymerizable double bond,(b) a monomer which, when polymerized, provides a resin in which Tg is 20.degree. C. higher than that of the base resin, or a resin in which Tg is 20.degree. C. higher than that of the base resin,(c) a polyvinyl compound, and(d) a polymerization initiator(II) a photopolymerizable unsaturated monomer, and(III) a photopolymerization initiator.Type: GrantFiled: January 31, 1991Date of Patent: April 20, 1993Assignee: Nippon Paint Co., Ltd.Inventors: Hisaichi Muramoto, Yusuke Ninomiya, Keizou Ishii, Shinichi Ishikura
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Patent number: 5198500Abstract: Disclosed is an improved process of the post-emulsion method capable of forming crosslinked resin particles which do not have fusion bonds between particles and which have good storage stability and good redispersibility in an aqueous medium. The process comprises (a) dispersing in an aqueous medium a resinous component comprising (I) a base resin having a glass transition temperature (Tg) of 0.degree. C. or less and a polymerizable double bond, (II) a monomer which, when polymerized, provides a resin of which Tg is 20.degree. C. higher than that of said base resin, or a resin of which Tg is 20.degree. C. higher than that of the base resin, and (III) a polyvinyl compound; (b) crosslinking inside the dispersed resin particles and; (c) removing the aqueous medium therefrom.Type: GrantFiled: January 15, 1991Date of Patent: March 30, 1993Assignee: Nippon Paint Co., Ltd.Inventors: Hisaichi Muramoto, Yusuke Ninomiya, Keizou Ishii, Shinichi Ishikura
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Patent number: 5190586Abstract: Disclosed are pigment composite particles which are superior in water resistance, weather resistance, thermal stability and hardness. The pigment composite particles are prepared by suspension-polymerizing an aqueous suspension comprising(a) a pigment paste comprising pigment and a pigment grinding resin having a hydrophilic group of at least 0.2 mmol/g,(b) a polymerizable monomer and(c) a polymerization initiator.Type: GrantFiled: November 28, 1990Date of Patent: March 2, 1993Assignee: Nippon Paint Co., Ltd.Inventors: Katsumi Mizuguchi, Masanori Ohiwa, Keizou Ishii, Shinichi Ishikura
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Patent number: 5159017Abstract: Novel crosslinked polymer microparticles having a mean grain diameter of 0.01 to 10.mu., whose polymer carries urea, urethane or amide groups. The invention also provides a coating composition containing said crosslinked polymer microparticles, which is excellent in application characteristics and storage stability and is capable of providing a coating with excellent film properties.Type: GrantFiled: December 18, 1990Date of Patent: October 27, 1992Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Akio Kashihara, Shinichi Ishikura
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Patent number: 5154967Abstract: Novel composite resinous film comprising a continuous phase of at least one resin and a discontinuous phase of microdomains which are aggregates of particles of at least one insoluble resin and are 0.03 to 10 microns in size, is provided. The film can exhibit the most desirous properties of the respective, constituent resinous materials and are useful in various fields including the paint industry.Type: GrantFiled: March 8, 1991Date of Patent: October 13, 1992Assignee: Nippon Paint Co., Ltd.Inventors: Keizou Ishii, Teruaki Kuwajima, Hiroshi Miwa, Akio Kashihara, Shinichi Ishikura
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Patent number: 5115020Abstract: The invention concerns a process for preparing composite resin particles having the so-called semi-IPN (inter penetration network) structure, in which linear thermoplastic polymer chains get entangled with a crosslinked polymer core through partial or thorough penetration. This method is very important in that both of the chain polymer and core polymer are freely selected from various resins.Type: GrantFiled: July 19, 1990Date of Patent: May 19, 1992Assignee: Nippon Paint Co., Ltd.Inventors: Hisaichi Muramoto, Yusuke Ninomiya, Keizou Ishii, Shinichi Ishikura
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Patent number: 5008318Abstract: Novel composite resinous film comprising a continuous phase of at least one resin and a discontinuous phase of microdomains which are aggregates of particles of at least one insoluble resin and are 0.03 to 10 microns in size, is provided. The film can exhibit the most desirous properties of the respective, constituent resinous materials and are useful in various fields including the paint industry.Type: GrantFiled: February 17, 1989Date of Patent: April 16, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Keizou Ishii, Teruaki Kuwajima, Hiroshi Miwa, Akio Kashihara, Shinichi Ishikura
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Patent number: 4990571Abstract: Composite resin particles each comprising a particulate crosslinked polymer to which a number of substantially linear, metal-containing polymer chains are chemically bonded. The invention also provide methods for the preparation of said composite resin particles. The present composite resin particles have self-film forming properties, can give a stable dispersion in an organic solvent or a resinous varnish and are specifically useful in paint industries. The particles are further characterized by having the desired properties of the metal element contained therein, as, for example, self-catalytic function in crosslinking, excellent biological activities and the like.Type: GrantFiled: March 13, 1989Date of Patent: February 5, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Akio Kashihara, Shinichi Ishikura
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Patent number: 4990572Abstract: Composite resin particles each comprising a particulate crosslinked polymer to which a number of substantially linear, metal-containing polymer chains are chemically bonded. The invention also provide methods for the preparation of said composite resin particles. The present composite resin particles have self-film forming properties, can give a stable dispersion in an organic solvent or a resinous varnish and are specifically useful in paint industries. The particles are further characterized by having the desired properties of the metal element contained therein, as, for example, self-catalytic function in crosslinking, excellent biological activities and the like.Type: GrantFiled: March 13, 1989Date of Patent: February 5, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Akio Kashihara, Shinichi Ishikura
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Patent number: 4959417Abstract: Composite acrylic acrylic resin particles each comprising a particular metal-containing crosslinked acrylic polymer to which a number of substantially linear acrylic polymer chains are chemically bonded are provided. Such particles are specifically useful as resinous filler in curing type coating compositions because of having curing catalytic activities.Type: GrantFiled: April 22, 1988Date of Patent: September 25, 1990Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Shinichi Ishikura
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Patent number: 4920175Abstract: Promotors for a crosslinking reaction involved in the curing of a system comprising crosslinkable polymers are bound to polymeric microparticles having a diameter of about 0.01 to 6 microns prepared by polymerizing a mixture of ethylenically unsaturated monomers. The microparticles carrying the crosslinking reaction promotor may be incorporated to coating compositions, printing inks, sealants, adhesives and other polymeric products in place of conventional crosslinking reaction promotors.Type: GrantFiled: July 28, 1988Date of Patent: April 24, 1990Assignee: Nippon Paint Co., Ltd.Inventors: Kazunori Kanda, Shinichi Ishikura, Keizou Ishii, Akio Kashihara
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Patent number: 4918147Abstract: A resin composition to be used as a resinous vehicle for an antifouling paint and a process for preparing the same, comprising reacting a mixture of(A) an acid group containing base resin having an acid value in the range of 25-350 mg KOH/g, selected from the group consisting of vinyl resin, polyester resin, alkyd resin and epoxy resin,(B) a metallic salt of low boiling organic basic acid having a boiling point in the range of 100.degree.-240.degree. C., the metal is selected from metals having a valence of 2 or more and a lesser ionization tendency than alkali metals, and(C) an organic monobasic acid having a boiling point of 20.degree. C. or more higher than said low boiling organic basic acid at an elevated temperature which is lower than the decomposition temperature of said metallic salt of said low boiling organic basic acid, while removing the formed low boiling organic basic acid out of the system. The subject composition provides superior antifouling coating compositions.Type: GrantFiled: May 16, 1988Date of Patent: April 17, 1990Assignee: Nippon Paint Co., Ltd.Inventors: Naoki Yamamori, Masayuki Matsuda, Kiyoaki Higo, Shinichi Ishikura
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Patent number: 4869796Abstract: An electrodeposition coating composition comprising (a) a water-dispersible, electrically depositable binder resin and (b) water-insoluble, internally crosslinked polymer microparticles having a particle size from 0.01 to 2 microns, said polymer microparticles bearing on their surfaces physically adhered or covalently bound thereto an amphoionic group of the formula: ##STR1## wherein R represents an unsubstituted or substituted C.sub.1 -C.sub.6 alkylene or phenylene, A is --COOH or --SO.sub.3 H.Type: GrantFiled: August 5, 1987Date of Patent: September 26, 1989Assignee: Nippon Paint Co., Ltd.Inventors: Kazunori Kanda, Hisaichi Muramoto, Koichi Saito, Shinichi Ishikura
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Patent number: 4870132Abstract: A resin composition having (a) amphoionic group of the formula: ##STR1## wherein R is optionally substituted C.sub.1 -C.sub.6 alkylene or phenylene and Y is --COOH or --SO.sub.3 H, (b) an ethylenically unsaturated group, and (c) a silicon-containing organic group. The resin composition is useful as a reactive emulsifier in the emulsion polymerization of ethylenically unsaturated monomers.Type: GrantFiled: September 20, 1988Date of Patent: September 26, 1989Assignee: Nippon Paint Co., Ltd.Inventors: Akio Kashihara, Tadafumi Miyazono, Keizou Ishii, Shinichi Ishikura