Patents by Inventor Atsuo Otsuji
Atsuo Otsuji 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).
-
Patent number: 7008571Abstract: A poly(thio)ester (co)polymer which comprises a repeating structural unit represented by the formula (1-A) as an essential structural unit: [wherein R11 is a divalent aliphatic hydrocarbon group which may contain at least one sulfur atom in a sulfide group; R12 is a mono- or poly-cyclic aliphatic or aromatic dicarboxylic acid residue; and X11 and X12 are each independently an oxygen atom or sulfur atom, and when X11 and X12 are the oxygen atoms, R11 is a divalent aliphatic hydrocarbon group containing at least one sulfur atom in the sulfide group]; and an optical component obtainable by molding the poly(thio)ester (co)polymer. The poly(thio)ester (co)polymer is excellent in transparency and optical characteristics (e.g., a higher refractive index, higher Abbe number, and lower birefringence), and has also good mechanical characteristics and thermal characteristics, and further is excellent in melt fluidity and injection moldability.Type: GrantFiled: March 11, 2002Date of Patent: March 7, 2006Assignee: Mitsui Chemicals, Inc.Inventors: Chojiro Higuchi, Atsuo Otsuji, Kenichi Sugimoto, Mitsuo Nakamura, Masatoshi Takagi, Yasuhiro Nukii, Koju Okazaki
-
Publication number: 20060003261Abstract: A photopolymerizable composition comprising a polymerizable compound and a photopolymerization initiator, wherein the polymerizable compound is characterized by comprising (a) a bifunctional (meth)acrylic acid (thio)ester compound containing a sulfur atom in the molecule and (b) at least one of a (meth)acrylic acid ester compound represented by the general formula (1) or a bifunctional (meth)acrylic acid ester compound having a urethane linkage: wherein R1 and R2 are each independently a hydrogen atom or a methyl group; R3 and R4 are each independently an alkyl group, an aralkyl group, an aryl group or a halogen atom; m and n are each an integer of 0 to 2; X1 is an alkylidene group having 1 to 3 carbon atoms; and Y1 and Y2 are each independently a poly(oxyalkylene) group with the proviso that at least one of Y1 and Y2 is a poly(oxyalkylene) group having a hydroxy group.Type: ApplicationFiled: July 17, 2003Publication date: January 5, 2006Applicant: Mitsui Chemicals, Inc.Inventors: Masao Imai, Mitsuo Nakamura, Hiroshi Naruse, Osamu Kohgo, Masahiro Enna, Atsuo Otsuji
-
Patent number: 6835844Abstract: The present invention provides an acrylic ester compound represented by formula (1), a polymerizable composition containing the acrylic ester compound, and a cured product and an optical component obtained by polymerizing the polymerizable composition: (wherein “a” is an integer of 0 to 4; R1 is a directly bonded single bond, an alkylene group, an aralkylene group or arylene group which may have a substituent, or a —Y3—S—R4—S—Y4— group (R4 is an alkylene group, an aralkylene group or an arylene group; and Y3 and Y4 are each an alkylene group); R2 and R3 are each a hydrogen atom or an alkyl group; X1 and X2 are each an oxygen atom or a sulfur atom; and Y1 and Y2 are each an alkylene group which may contain an oxygen atom or a sulfur atom).Type: GrantFiled: January 13, 2003Date of Patent: December 28, 2004Assignee: Mitsui Chemicals, Inc.Inventors: Mitsuo Nakamura, Masao Imai, Atsuo Otsuji
-
Patent number: 6794471Abstract: An acrylic ester compound represented by the general formula (1): wherein, R1 and R2 represent independently a hydrogen atom, an alkyl group which may have a substituent, an aromatic alkyl group which may have a substituent or an aromatic residue which may have a substituent, respectively; R3 represents a hydrogen atom or an alkyl group; A represents a divalent organic group; and X represents a sulfur atom or an oxygen atom; provided that when X is an oxygen atom, R1 represents an aromatic residue that may have a substituent, a polymerizable composition comprising the compound, and a cured article and optical components obtained by polymerizing the polymerizable composition.Type: GrantFiled: September 24, 2001Date of Patent: September 21, 2004Assignee: Mitsui Chemicals, Inc.Inventors: Tadashi Ohkuma, Masao Imai, Mitsuo Nakamura, Atsuo Otsuji
-
Publication number: 20040102592Abstract: The present invention provides an acrylic ester compound represented by formula (1), a polymerizable composition containing the acrylic ester compound, and a cured product and an optical component obtained by polymerizing the polymerizable composition: 1Type: ApplicationFiled: January 13, 2003Publication date: May 27, 2004Inventors: Mitsuo Nakamura, Masao Imai, Atsuo Otsuji
-
Publication number: 20040039080Abstract: Disclosed is a dental material comprising a sulfur-containing unsaturated carboxylic acid ester compound having a substituent containing a sulfur atom and at least two (meth)acrylic acid residues through an oxygen atom bonded to a secondary or tertiary carbon atom, specifically, a dental material comprising a polymerizable monomer (A) represented by the following formula (1): 1Type: ApplicationFiled: April 22, 2003Publication date: February 26, 2004Inventors: Narimichi Honda, Akifumi Kasagi, Masatoshi Takagi, Atsuo Otsuji, Keisuke Takuma, Takahiro Fujyama
-
Publication number: 20030204030Abstract: A poly(thio)ester (co)polymer which comprises a repeating structural unit represented by the formula (1-A) as an essential structural unit: 1Type: ApplicationFiled: November 8, 2002Publication date: October 30, 2003Inventors: Chojiro Higuchi, Atsuo Otsuji, Kenichi Sugimoto, Mitsuo Nakamura, Masatoshi Takagi, Yasuhiro Nukii, Koju Okazaki
-
Patent number: 6570025Abstract: This invention provides sulfur-containing (meth)acrylic ester compounds each of which is represented by the following formula (1); wherein R1 and R2 each independently represent a hydrogen atom or an alkyl group or may be fused together to form a ring, R3 represents a hydrogen atom or a methyl group, X1 represents an oxygen atom or a sulfur atom, m stands for an integer of from 0 to 3, and n stands for an integer of from 1 to 4, polymerizable compositions comprising the sulfur-containing (meth)acrylic acids, and cured products and optical parts obtained by polymerizing the polymerizable compositions. The sulfur-containing (meth)acrylic ester compounds according to the present invention are very useful, as monomers for photocurable, polymerizable compositions, in applications such as optical materials and dental materials.Type: GrantFiled: January 25, 2002Date of Patent: May 27, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Kenichi Fujii, Atsuo Otsuji, Masao Imai, Kenichi Sugimoto, Tadashi Okuma, Rihoko Suzuki, Keisuke Takuma
-
Publication number: 20030085387Abstract: Optical materials with improved heat resistance, especially dopant-type GI POFs with improved heat resistance are provided.Type: ApplicationFiled: January 25, 2002Publication date: May 8, 2003Inventors: Takahiro Fujiyama, Hideo Hama, Atsuo Otsuji, Keisuke Takuma
-
Patent number: 6482916Abstract: The present invention provides a dyed molded article obtained by dyeing a polycarbonate molded article having repeating structural units represented by the following formula (1-a): Since the polycarbonate molded article is dyed easily, the present invention has made it possible to provide a lens made of a dyed polycarbonate.Type: GrantFiled: May 25, 2001Date of Patent: November 19, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Atsuo Otsuji, Kenichi Fujii, Kenichi Sugimoto, Masao Imai, Rihiko Suzuki
-
Patent number: 6458908Abstract: A sulfur-containing unsaturated carboxylate compound comprising a sulfur-containing substituent and at least two &agr;,&bgr;-unsaturated carboxylic acid residues, which are each attached to a secondary or tertiary carbon atom via an oxygen atom; a polymerizable composition comprising the sulfur-containing unsaturated carboxylate compound; a cured product prepared by polymerizing the polymerizable composition; an optical component consisting of the cured product; and novel intermediate compounds for preparation of the above carboxylate.Type: GrantFiled: May 31, 2000Date of Patent: October 1, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Masao Imai, Kenichi Sugimoto, Kenichi Fujii, Atsuo Otsuji, Tadashi Ohkuma, Masatoshi Takagi, Rihoko Suzuki, Keisuke Takuma
-
Publication number: 20020061995Abstract: An acrylic ester compound represented by the general formula (1): 1Type: ApplicationFiled: September 24, 2001Publication date: May 23, 2002Inventors: Tadashi Ohkuma, Masao Imai, Mitsuo Nakamura, Atsuo Otsuji
-
Publication number: 20010054863Abstract: In the present slide rail a space receives a roller. Upper and lower rollers have their respective axes for rotation having inclinations of &thgr; and −&thgr;°, respectively, relative to an axis perpendicular to a body of the external rail. Thus the slide rail can have a simple structure.Type: ApplicationFiled: May 15, 2001Publication date: December 27, 2001Inventors: Takahiro Uchino, Atsuo Otsuji
-
Patent number: 6320020Abstract: A sulfur-containing (thio)ether (co)polymer comprising repetitive structural units represented by general formulas 1 and 2, and an optical element using the (co)polymer: where A and B are bivalent organic group; R1 and R2 are hydrogen or alkyl; X1 to X4 are oxygen or sulfur; Y1 and Y2 are halogen, hydroxy, —OR3 or —SR4, in which R3 is sulfur-containing alkyl, aryl, heterocycle or acyl optionally having a substituent other than SH; and R4 is alkyl, aryl, heterocycle or acyl; provided that —OR3 and/or —SR4 constitute 10 to 100% of the total of Y1+Y2. The (co)polymer exhibits good optical, mechanical and thermal properties and a higher refractive index, and may be prepared in a good productivity. The sulfur-containing (thio)ether (co)polymer is useful for manufacturing a variety of optical elements.Type: GrantFiled: September 3, 1999Date of Patent: November 20, 2001Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Kenichi Sugimoto, Atsuo Otsuji, Rihoko Suzuki, Kenichi Fujii, Masao Imai
-
Patent number: 6080833Abstract: A low-birefringent organic optical component comprising a polymer prepared by polymerizing a racemic mixture of the monomer with an asymmetric spiro ring represented by general formula (1) as an essential ingredient; wherein ring A represents a monocyclic or polycyclic organic group, wherein two ring As are mutually bound each other via a spiro bond to form a spiro ring which has a molecular asymmetric structure; n is an integer of 0 to 10; X.sub.1 and Y.sub.1 are binding groups; and Z.sub.1 is a polymerization-active group. The component has excellent transparency, mechanical strength and heat resistance, as well as a low birefringence.Type: GrantFiled: July 17, 1997Date of Patent: June 27, 2000Assignee: Mitsui Chemicals, Inc.Inventors: Atsuo Otsuji, Keisuke Takuma, Rihoko Suzuki, Tatsuhiro Urakami, Toshihiro Motoshima, Wataru Yamashita, Tomomi Yoshimura, Atsushi Shibuya, Yoshihiro Sakata, Hideaki Oikawa, Masahiro Ohta, Masanobu Ajioka, Masatoshi Takagi, Akio Karasawa
-
Patent number: 6028161Abstract: A polycarbonate copolymer comprising the repeating structural unit represented by general formula (1-a) and at least one of the repeating structural units represented by general formulas (2-a) and (3-a) is provided.Type: GrantFiled: December 17, 1998Date of Patent: February 22, 2000Assignee: Mitsui Chemicals, Inc.Inventors: Atsuo Otsuji, Rihoko Suzuki, Kenichi Sugimoto, Tatsuhiro Urakami, Keisuke Takuma
-
Patent number: 5945503Abstract: A polymaleimide resin composition is herein disclosed which comprises an aromatic amino resin, a polymaleimide resin and a bifunctional crosslinking agent as components, and the bifunctional crosslinking agent is selected from the group consisting of an aliphatic diamine compound, a 2,4-diamino-S-triazine compound, a diisocyanate compound, an aliphatic diamine compound and a bismaleimide compound; and a laminate plate for a semiconductor substrate in which the polymaleimide resin composition is used is also disclosed. The thermosetting resin composition permits the preparation of prepregs and green sheets having excellent flexibility, so that the workability and the productivity of the laminate plates can remarkably be improved.Type: GrantFiled: November 10, 1997Date of Patent: August 31, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Takuo Tajima, Yoshiyuki Shindo, Koutaro Suzuki, Tatsuhiro Urakami, Atsuo Otsuji, Kouzou Tanaka
-
Patent number: 5861108Abstract: Provided is a naphthalene compound represented by the following Formula (1): ##STR1## wherein R.sub.1 and R.sub.2 each represent a linear or branched alkyl group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms which may be substituted with halogen atoms and have no asymmetric carbon atoms; A represents any of the groups represented by the following formulas: ##STR2## (wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 each represent a hydrogen atom or a halogen atom); and z represents 0 or 1. The addition of this naphthalene compound to a liquid crystal composition makes it possible to improve various characteristics such as the high speed response property of the liquid crystal composition and the temperature dependency of the response time. The above naphthalene compound is useful as a liquid crystal material for liquid crystal compositions, particularly ferroelectric liquid crystal compositions.Type: GrantFiled: July 1, 1996Date of Patent: January 19, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Tsutomu Ishida, Atsuo Otsuji, Yoshiyuki Totani, Motokazu Hirao, Hiroe Kayashima, Masakatsu Nakatsuka
-
Patent number: 5770108Abstract: A novel pyrimidine compound represented by the following Formulas (1) and (2), a liquid crystal composition containing said compound and a liquid crystal element having excellent characteristics such as high speed response, orientation and high contrast ratio. ##STR1## wherein R.sub.1 and R.sub.2 each represent a linear or branched alkyl or alkenyl group, an alkoxyl or alkenyloxy group; R.sub.3 and R.sub.4 each represent a linear or branched alkyl group or alkenyl group; A.sub.1 and A.sub.2 each represent a substituted or unsubstituted 1,4-phenylene group, a pyridine-2,5-diyl or trans-1,4-cyclohexylene group; X.sub.1 and X.sub.2 each represent a single bond, --COO--, --OCO--, --OCH.sub.2 or --CH.sub.2 O-- group; Y.sub.1 and Y.sub.2 each represent --COO-- or --OCO-- group; and a, b, p, q, m and n each represent 0 or 1, provided that a+b+p+q is not 0.Type: GrantFiled: June 21, 1996Date of Patent: June 23, 1998Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshiyuki Totani, Motokazu Hirao, Atsuo Otsuji, Tsutomu Ishida, Hiroe Kayashima, Masakatsu Nakatsuka
-
Patent number: 5476957Abstract: The heat-sensitive recording material disclosed comprises a colorless or pale colored dyestuff precursor, one or more salicylic acid derivative of the formula (1) or metal salt of the derivative and an aliphatic amide compound having 18.about.60 carbon atoms in molecular structure, and is excellent in thermal response and preservation stability of white portions and images. ##STR1## wherein X.sub.1 and X.sub.2 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group or an aryl group, Y.sub.1 and Y.sub.2 are an oxygen atom or a sulfur atom, R.sub.1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group, and R.sub.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group.Type: GrantFiled: November 9, 1994Date of Patent: December 19, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshimitsu Tanabe, Yuki Kobayashi, Atsuo Otsuji, Masakatsu Nakatsuka, Akihiro Yamaguchi