Patents by Inventor Eiji Yashima
Eiji Yashima 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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Publication number: 20150141241Abstract: Provided is a novel separating agent for optical isomers based on a helical polymer having optically active sites. The separating agent for optical isomers has a helical polymer having a structure represented by Formula (I), and a carrier that supports the helical polymer, wherein the helical polymer is supported by the carrier. (In Formula (I), X represents a divalent aromatic group, a single bond or a methylene group; R represents hydrogen or a C1-C5 alkoxy; and n represents an integer equal to or higher than 5. When X is a divalent aromatic group, Y represents —CONH—, —COO—, —NHCONH—, —NHCSNH—, —SO2NH— or —NHCOO—, and when X is a single bond or a methylene group, Y represents —COO—, —NHCONH—, —NHCSNH— or —NHCOO—.Type: ApplicationFiled: May 10, 2013Publication date: May 21, 2015Inventors: Eiji Yashima, Hiroki Iida, Zhenglin Tang, Yuki Naito
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Patent number: 9028684Abstract: Disclosed is a separating agent for optical isomer which is excellent in optical separation ability. Specifically disclosed is a separating agent for optical isomer containing: an inclusion complex including a ?-conjugated polymer in a polymer compound having a hydroxy group or an amino group; and a carrier, the inclusion complex being carried by the carrier.Type: GrantFiled: April 28, 2010Date of Patent: May 12, 2015Assignees: DAICEL CHEMICAL INDUSTRIES, LTD., NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Eiji Yashima, Kazumi Tamura
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Patent number: 8383717Abstract: The invention provides a process for producing spiral polymers controlled in the direction of spiral winding easily from inexpensive general-purpose polymers; and spiral polymers controlled in the direction of spiral winding. The invention relates to a process for the production of syndiotactic polymethacrylate- or polyacrylate-type spiral polymers controlled in the direction of spiral winding which comprises dissolving a syndiotactic polymethacrylate- or polyacrylate-type polymer and a chiral compound in a solvent preferably under heating, subjecting the obtained solution to cooling or concentration to form a solid matter, and separating the solid matter; and so on.Type: GrantFiled: March 18, 2008Date of Patent: February 26, 2013Assignee: Japan Science and Technology AgencyInventors: Takehiro Kawauchi, Jiro Kumaki, Eiji Yashima
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Publication number: 20120149851Abstract: To provide a novel separating agent for optical isomers based on a polymer having an optically active moiety, provided is a separating agent for optical isomers formed of: a helical polymer obtained by using an aromatic isonitrile as a monomer having an amide group in which an optically active amino acid is amide-bonded to an aromatic ring; and a carrier for carrying the helical polymer by being chemically bonded to an end of the helical polymer.Type: ApplicationFiled: August 20, 2010Publication date: June 14, 2012Inventors: Eiji Yashima, Kazumi Tamura, Toshitaka Miyabe
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Publication number: 20120007011Abstract: Disclosed is a separating agent for optical isomer which is excellent in optical separation ability. Specifically disclosed is a separating agent for optical isomer comprising: an inclusion complex including a ?-conjugated polymer in a polymer compound having a hydroxy group or an amino group; and a carrier, the inclusion complex being carried by the carrier.Type: ApplicationFiled: April 28, 2010Publication date: January 12, 2012Inventors: Eiji Yashima, Kazumi Tamura
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Publication number: 20110144262Abstract: The invention provides a process for producing spiral polymers controlled in the direction of spiral winding easily from inexpensive general-purpose polymers; and spiral polymers controlled in the direction of spiral winding. The invention relates to a process for the production of syndiotactic polymethacrylate- or polyacrylate-type spiral polymers controlled in the direction of spiral winding which comprises dissolving a syndiotactic polymethacrylate- or polyacrylate-type polymer and a chiral compound in a solvent preferably under heating, subjecting the obtained solution to cooling or concentration to form a solid matter, and separating the solid matter; and so on.Type: ApplicationFiled: March 18, 2008Publication date: June 16, 2011Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Takehiro Kawauchi, Jiro Kumaki, Eiji Yashima
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Patent number: 7691291Abstract: Novel optically active polyacetylene derivatives exhibiting liquid crystallinity; liquid crystal compositions containing the derivatives; and moldings thereof. Specifically, polyacetylene derivatives which have helical structure of rigid-rod shape and which exhibit a liquid crystal phase either in a solvent containing an organic solvent as the main component or in a molten state as well as electric field orientation; liquid crystal compositions containing the derivatives; and moldings thereof.Type: GrantFiled: August 26, 2005Date of Patent: April 6, 2010Assignee: Japan Science and Technology AgencyInventors: Kento Okoshi, Eiji Yashima
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Patent number: 7619109Abstract: Disclosed are: a method for production of a polyisocyanide derivative having a stable helical main chain structure with a right-handed or left-handed helix or a mixture thereof from a single type of monomer by polymerizing an aromatic isocyanate having a substituent harboring a structure —CONH in the aromatic ring and a hydrophobic moiety having 6 or more carbon atoms in a polymerization solvent, wherein the direction of the helix depends on the polarity of the polymerization solvent; a poly(aromatic isocyanide) derivative produced by the method; and an aromatic isocyanide which is useful as a monomer for use in the production of the poly(aromatic isocyanide) derivative.Type: GrantFiled: December 1, 2006Date of Patent: November 17, 2009Assignee: Japan Science and Technology AgencyInventors: Kento Okoshi, Eiji Yashima, Hisanari Onouchi, Shin-Ichiro Sakurai, Takashi Kajitani
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Patent number: 7563387Abstract: A hydrophilic stiff main chain type liquid crystal comprising a water-soluble salt of a synthetic helical polymer having no asymmetric carbon atom as a main component of the main chain thereof, for example, a polyacetylene derivative having such constitution; and a chiral sensor utilizing a liquid crystal comprising a water-soluble salt of the above synthetic helical polymer, in particular, a water-soluble salt of the above synthetic helical polymer having no asymmetric carbon atom.Type: GrantFiled: January 31, 2005Date of Patent: July 21, 2009Assignee: Japan Science and Technology AgencyInventors: Koichi Sakajiri, Eiji Yashima
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Publication number: 20090030227Abstract: The object is to provide: a method for producing a polymer having a stable right-handed or left-handed helical structure from a single type of monomer in a per-selective manner and controlling the proportion between a polymer having the right-handed helical structure and a polymer having the left-handed helical structure; and a polymeric material which can be used for the formation of any of the right-handed and left-handed helical structures.Type: ApplicationFiled: December 1, 2006Publication date: January 29, 2009Applicant: Japan Science and Technology AgencyInventors: Kento Okoshi, Eiji Yashima, Hisanari Onouchi, Shin-ichiro Sakurai, Takashi Kajitani
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Publication number: 20070260028Abstract: Novel optically active polyacetylene derivatives exhibiting liquid crystallinity; liquid crystal compositions containing the derivatives; and moldings thereof. Specifically, polyacetylene derivatives which have helical structure of rigid-rod shape and which exhibit a liquid crystal phase either in a solvent containing an organic solvent as the main component or in a molten state as well as electric field orientation; liquid crystal compositions containing the derivatives; and moldings thereof.Type: ApplicationFiled: August 26, 2005Publication date: November 8, 2007Applicant: Japn Science and Technology AgencyInventors: Kento Okoshi, Eiji Yashima
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Publication number: 20070145329Abstract: A hydrophilic stiff main chain type liquid crystal comprising a water-soluble salt of a synthetic helical polymer having no asymmetric carbon atom as a main component of the main chain thereof, for example, a polyacetylene derivative having such constitution; and a chiral sensor utilizing a liquid crystal comprising a water-soluble salt of the above synthetic helical polymer, in particular, a water-soluble salt of the above synthetic helical polymer having no asymmetric carbon atom.Type: ApplicationFiled: January 31, 2005Publication date: June 28, 2007Applicant: Japan Science and Technology AgencyInventors: Koichi Sakajiri, Eiji Yashima
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Patent number: 6833430Abstract: A process for the production of polyacetylene derivatives by which polyacetylene derivatives having an ability to discriminate asymmetry can be easily obtained in a few steps and in high yield and which is also advantageous in respects of economical efficiency, environmental problems, and so on. This process is characterized by polymerizing an acetylene derivative having a hydrophilic functional group in an aqueous solvent in the presence of a water-soluble transition metal complex catalyst and a base.Type: GrantFiled: October 9, 2002Date of Patent: December 21, 2004Assignee: Japan Science and Technology AgencyInventors: Eiji Yashima, Katsuhiro Maeda
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Publication number: 20030114618Abstract: A process for the production of polyacetylene derivatives by which polyacetylene derivatives having an ability to discriminate asymmetry can be easily obtained in a few steps and in high yield and which is also advantageous in respects of economical efficiency, environmental problems, and so on. This process is characterized by polymerizing an acetylene derivative having a hydrophilic functional group in an aqueous solvent in the presence of a water-soluble transition metal complex catalyst and a base.Type: ApplicationFiled: October 9, 2002Publication date: June 19, 2003Inventors: Eiji Yashima, Katsuhiro Maeda
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Patent number: 6559258Abstract: A water-soluble polymer which has higher sensitivity and is responsive to the chirality of a wide range of optically active isomers. It is a poly(phosphonoarylacetylene) represented by the following formula (I) or a salt thereof, (Wherein Ar represents an aryl group substituted by a phosphono group; and n is an integer of 5 or larger). Also provided is a chiral sensor or optical resolving reagent each comprising the poly(phosphonoarylacetylene) or its salt.Type: GrantFiled: March 29, 2002Date of Patent: May 6, 2003Assignee: Japan Science and Technology CorporationInventors: Eiji Yashima, Katsuhiro Maeda
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Publication number: 20020156217Abstract: A water-soluble polymer which has higher sensitivity and is responsive to the chirality of a wide range of optically active isomers.Type: ApplicationFiled: March 29, 2002Publication date: October 24, 2002Inventors: Eiji Yashima, Katsuhiro Maeda
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Patent number: 6217769Abstract: The invention provides separating agents for optical isomers which have a high optical resolving power inherent in polysaccharide derivatives and high solvent resistance, and which can be produced through short process steps; a process for producing the same, and a method for separating optical isomers. The invention also provides separating agents for optical isomers, wherein the surface of a polysaccharide derivative supported on a carrier or the surface of a pulverized or granulated polysaccharide derivative is coated with a polymer, which are produced by supporting the polysaccharide derivative on the carrier and then coating the surface thereof with the polymer to thereby immobilize the polysaccharide derivative on the substrate, or by grinding or spheroidizing the polysaccharide derivative and then coating the surface thereof with a polymer.Type: GrantFiled: April 19, 1999Date of Patent: April 17, 2001Assignee: Daicel Chemical Industries, Ltd.Inventors: Yoshio Okamoto, Eiji Yashima
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Patent number: 5736411Abstract: A chiral shift reagent for .sup.1 H-NMR and .sup.13 C-NMR, starting materials are easily available, synthesis is easy and of which performance is excellent, is provided. A chiral shift reagent for NMR comprising a saccharide derivative, and an analytical method which comprises measuring an NMR spectrum of an optical isomer mixture or an optically active substance in the presence of such a chiral shift reagent to analyze the mixing ratio of the optical isomers or the optical purity and absolute configuration of the optically active substance on the basis of the spectrum.Type: GrantFiled: October 22, 1996Date of Patent: April 7, 1998Assignee: Daicel Chemical Industries, Ltd.Inventors: Yoshio Okamoto, Eiji Yashima, Kazuma Oguni