Patents by Inventor Yohnosuke Ohsaka
Yohnosuke Ohsaka 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: 5270090Abstract: A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms, R.sub.f, is a perfluoroalkyl group having 1 to 12 carbon atoms, p is an integer of 1 to 3, q is an integer of 0 to 3, r is 0 or 1, s is an integer of 0 to 5 and t is an integer of 0 to 5,Y is X, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a fluoroalkyl group having 1 to 8 carbon atoms, andeach A is independently ##STR3## in which D is an amino, carboxyl, hydroxyl, methyl or haloformyl group, and n is an integer of 1 or 2, or ##STR4## can be used to derive various compounds, some of which are useful for preparing a fluorine-containing epoxy compound or polyimide with good properties.Type: GrantFiled: November 17, 1992Date of Patent: December 14, 1993Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Tsutomu Kobayashi, Motonobu Kubo
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Patent number: 5264598Abstract: A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms, R.sub.f ' is a perfluoroalkyl group having 1 to 12 carbon atoms, p is an integer of 1 to 3, q is an integer of 0 to 3, r is 0 or 1, s is an integer of 0 to 5 and t is an integer of 0 to 5,Y is X, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a fluoroalkyl group having 1 to 8 carbon atoms, andeach A is independently ##STR3## in which D is an amino, carboxyl, hydroxyl, methyl or haloformyl group, and n is an integer of 1 or 2, or ##STR4## can be used to derive various compounds, some of which are useful for preparing a fluorine-containing epoxy compound or polyimide with good properties.Type: GrantFiled: September 23, 1992Date of Patent: November 23, 1993Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Tsutomu Kobayashi, Motonobu Kubo
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Patent number: 5166365Abstract: A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms,R.sub.f ' is a perfluoroalkyl group having 1 to 12 carbon atoms,p is an integer of 1 to 3,q is an integer of 0 to 3,r is 0 or 1,s is an integer of 0 to 5and t is an integer of 0 to 5,Y is X, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a fluoroalkyl group having 1 to 8 carbon atoms, andeach A is independently ##STR3## in which D is an amino, carboxyl, hydroxyl, methyl or haloformyl group, and n is an integer of 1 or 2, or ##STR4## can be used to derive various compounds, some of which are useful for preparing a fluorine-containing epoxy compound of polyimide with good properties.Type: GrantFiled: May 10, 1990Date of Patent: November 24, 1992Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Tsutomu Kobayashhi, Motonobu Kubo
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Patent number: 4973742Abstract: A halogen-containing polyether comprising repeating units of the formula:--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.a --(CHClCF.sub.2 CF.sub.2 O).sub.b --(CCl.sub.2 CF.sub.2 CF.sub.2 O).sub.c --(CHFCF.sub.2 CF.sub.2 O).sub.d --(CFClCF.sub.2 CF.sub.2 O).sub.e --(CF.sub.2 CF.sub.2 CF.sub.2 O).sub.f --(I)wherein a, b, c, d, e and f are each an integer not less than 0 and satisfy the following equations:2.ltoreq.a+b+c+d+e+f.ltoreq.200and1.ltoreq.a+c+d+f,which may be prepared by ring-opening polymerizing 2,2,3,3-tetrafluorooxetane in the presence of a polymerization initiator to give a polyether comprising repeating units of the formula:--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.a -- (II)wherein a is the same as defined above, and optionally fluorinating and/or chlorinating the polyether (II).Type: GrantFiled: April 14, 1989Date of Patent: November 27, 1990Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka, Shoji Takaki
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Patent number: 4946935Abstract: A novel fluorine-containing aromatic compound of the formula: ##STR1## wherein X is ##STR2## in which R.sub.f is a perfluoroalkyl group having 1 to 10 carbon atoms, R.sub.f ' is a perfluoroalkyl group having 1 to 12 carbon atoms, p is an integer of 1 to 3, q is an integer of 0 to 3, r is 0 or 1, s is an integer of 0 to 5 and t is an integer of 0 to 5,Y is X, a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a fluoroalkyl group having 1 to 8 carbon atoms, andeach A is independently ##STR3## in which D is an amino, carboxyl, hydroxyl, methyl or haloformyl group, and n is an integer of 1 or 2, or ##STR4## can be used to derive various compounds, some of which are useful for preparing a fluorine-containing epoxy compound or polyimide with good properties.Type: GrantFiled: April 4, 1988Date of Patent: August 7, 1990Assignee: Daikin Industries, Ltd.Inventors: Yohnosuke Ohsaka, Tsutomu Kobayashi, Motonobu Kubo
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Patent number: 4946972Abstract: A novel process for distillation of a mixture comprising 2,2,3,3-tetrafluorooxetane, which method comprises distilling the mixture comprising 2,2,3,3-tetrafluorooxetane in a metallic distillation column in the presence of at least one additive compound selected from the group consisting of an organic nitro compound and an aromatic compound.Type: GrantFiled: January 23, 1989Date of Patent: August 7, 1990Assignee: Daikin Industries, Ltd.Inventors: Yohnosuke Ohsaka, Shoji Takaki
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Patent number: 4908460Abstract: A process for purifying 2,2,3,3-tetrafluorooxetane which contains at least one impurity compound selected from the group consisting of hydrogen fluoride and trifluoropropionylfluoride, which process comprises contacting 2,2,3,3-tetrafluorooxetane with at least one adsorbent selected from the group consisting of silica gel and alumina and causing said impurity to be adsorbed on said particles to remove it from the 2,2,3,3-tetrafluorooxetane.Type: GrantFiled: January 23, 1989Date of Patent: March 13, 1990Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Shoji Takaki
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Patent number: 4904417Abstract: A fluorine-containing polyether of the formula:A--X--A'wherein A and A' are the same or different and are each --COF, --COCl or --COOH, and X is --CF.sub.2 CF.sub.2 --R.sub.f --O--C.sub.m F.sub.2m --O--R.sub.f 'CF.sub.2 CF.sub.2 -- in which R.sub.f and R.sub.f ' are the same or different and are each a group containing a perfluoroalkylpolyether group, and m is a number of from 1 to 6, and a fluorine-containing polyether of the formula:Z--X.sub.n --Z'wherein X is the same as defined above, Z and Z' are the same or different and are each --COF, --COCl, --COOH or --CF.sub.2 CF.sub.2 --R.sub.f --B in which R.sub.f is the same as defined above and B is a fluorine atom or a C.sub.1 -C.sub.5 perfluoroalkyl group, and n is a number of from 0 to 100 provided that when n is 1, Z and Z' are each --CF.sub.2 CF.sub.2 R.sub.f B, provided that when n is 0, both Z and Z' are each --CF.sub.2 CF.sub.2 R.sub.f B or when n is 1, at least one of Z and Z' is --CF.sub.2 CF.sub.2 R.sub.f B.Type: GrantFiled: June 1, 1988Date of Patent: February 27, 1990Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka, Yoshitaka Honda, Norio Yanagisawa
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Patent number: 4886581Abstract: By extracting hydrogen fluoride from 2,2,3,3-tetrafluorooxetane with a halogenated hydrocarbon, a mixture of 2,2,3,2-tetrafluorooxetane and the halogenated hydrocarbon containing a small amount of hydrogen fluoride is obtained. The mixture may be distilled at least twice to obtain a mixture of 2,2,3,2-tetrafluorooxetane and the halogenated hydrocarbon containing substantially no hydrogen fluoride.Type: GrantFiled: July 1, 1987Date of Patent: December 12, 1989Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Shoji Takaki, Hiroo Sakai
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Patent number: 4864040Abstract: A novel monohalogenotrifluorooxetane of the formula: ##STR1## (wherein X is chlorine, bromine or iodine) which is prepared by reacting monohalogenotrifluoroethylene of the formula:CF.sub.2 .dbd.CFX (III)(wherein X is the same as defined above)with a compound having a --(CH.sub.2 O)-- unit.Type: GrantFiled: July 14, 1987Date of Patent: September 5, 1989Inventors: Yohnosuke Ohsaka, Satoru Kohno
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Patent number: 4845268Abstract: A halogen-containing polyether comprising repeating units of the formula:--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.2 --(CHClCF.sub.2 CF.sub.2 O).sub.b --(CCl.sub.2 CF.sub.2 CF.sub.2 O).sub.c --(CHFCF.sub.2 CF.sub.2 O).sub.d --(CFClCF.sub.2 CF.sub.2 O).sub.e --(CF.sub.2 CF.sub.2 CF.sub.2 O).sub.f --(I)wherein a, b, c, d, e and f are each an integer not less than 0 and satisfy the following equations:2.ltoreq.a+b+c+d+e+f.ltoreq.200and1.ltoreq.a+c+d+f,which may be prepared by ring-opening polymerizing 2,2,3,3-tetrafluorooxetane in the presence of an polymerization initiator to give a polyether comprising repeating units of the formula:--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.a -- (II)wherein a is the same as defined above, and optionally fluorinating and/or chlorinating the polyether (II).Type: GrantFiled: December 9, 1986Date of Patent: July 4, 1989Assignee: Daikin Industries, Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka, Shoji Takaki
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Patent number: 4825014Abstract: Chlorotrifluoromethylbenzene is prepared with a good yield by reacting chlorotoluene, hydrogen fluoride and chlorine in a gaseous phase in the presence of a catalyst selected from the group consisting of .alpha.-aluminum fluoride, .alpha.-aluminum fluoride carrying one or more salts of iron, bismuth, tin and lead, and chromium(III) oxide or partially fluorinated chromium(III) oxide carrying alkali metal fluoride.Type: GrantFiled: June 15, 1988Date of Patent: April 25, 1989Assignee: Daikin Kogyo Co., Ltd.Inventors: Yohnosuke Ohsaka, Heikitsu Sonoyama
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Patent number: 4739059Abstract: A novel amine amide of the formula: ##STR1## wherein the various substituents are defined hereinbelow. The compounds are useful as thickening agents, disoxidation catalysts and monomers.Type: GrantFiled: March 27, 1987Date of Patent: April 19, 1988Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Yoshio Amimoto, Yoshio Negishi
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Patent number: 4719052Abstract: 2,2,3-trifluoropropionyl fluoride is prepared by opening the ring of tetrafluorooxetane in the presence of a catalyst. Analogously, a novel 2,2-difluoropropionic acid derivative of the formula:XCH.sub.2 CF.sub.2 COY (I)wherein X is chlorine, bromine, iodine, a group of the formula:R.sub.1 O-- (II)orR.sub.2 COO-- (III)wherein R.sub.1 R.sub.2 are each an aliphaic or halogenated aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 8 carbon atoms optionally bearing at least one substituent, or a group of the formula:X'CH.sub.2 CF.sub.2 CF.sub.2 O-- (IV)wherein X' is fluorine, chlorine, bromine, iodine, the group of the formula: R.sub.1 O--or R.sub.2 COO--; and Y is fluorine or a group of the formula:--OR.sub.3 (V)wherein R.sub.Type: GrantFiled: December 20, 1984Date of Patent: January 12, 1988Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka, Shoji Takaki, Yoshio Negishi, Satoru Kohno
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Patent number: 4709060Abstract: A substituted trifluorooxetane of the formula: ##STR1## wherein R.sub.f is a C.sub.1 -C.sub.10 perfluoroalkyl group and n is 0, 1 or 2, which is useful as a solvent or a monomer.Type: GrantFiled: July 11, 1986Date of Patent: November 24, 1987Assignee: Daikin Industries, Ltd.Inventors: Yohnosuke Ohsaka, Shoji Takaki
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Patent number: 4683289Abstract: A novel polyaminoamide of the formula: ##STR1## wherein R.sub.m and R.sub.m ' are, the same or different, a hydrogen atom or a monovalent organic group and A.sub.m is a divalent organic group, or R.sub.m and/or R.sub.m ' form a cyclic group together with A.sub.m and the nitrogen atom to which they are bonded. m changes from 1 to p (where p is a positive integer) and n.sub.m is a positive integer, which can be prepared by reacting a 2,2,3,3-tetrafluorooxetane of the formula: ##STR2## with m kind(s) of diamine(s) of the formula: ##STR3## wherein m is the same as defined above.Type: GrantFiled: October 11, 1985Date of Patent: July 28, 1987Assignee: Daikin Industries Ltd.Inventors: Yohnosuke Ohsaka, Yoshio Amimoto, Yoshio Negishi
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Patent number: 4400563Abstract: A process for preparing perfluoro(lower)alkylbenzenes and derivatives thereof which comprises contacting a lower alkylbenzene or the corresponding derivative with hydrogen fluoride in the presence of chlorine in the gaseous phase at an elevated temperature to give the corresponding perfluoro(lower)alkylbenzene or its derivative thereof.Type: GrantFiled: June 20, 1979Date of Patent: August 23, 1983Assignee: Daikin Kogyo Co., Ltd.Inventors: Yohnosuke Ohsaka, Uji Hiramatsu, Toshihide Honda
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Patent number: 4367350Abstract: A process for preparing perfluoro(lower)alkylbenzenes and derivatives thereof which comprises contacting a lower alkylbenzene or the corresponding derivative with hydrogen fluoride in the presence of chlorine in a gaseous phase at an elevated temperature to give the corresponding perfluoro(lower)alkylbenzene or its derivative.Type: GrantFiled: December 27, 1977Date of Patent: January 4, 1983Assignee: Daikin Kogyo Co., Ltd.Inventors: Uji Hiramatsu, Toshihide Honda, Yohnosuke Ohsaka
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Patent number: 4296265Abstract: Hexafluoropropene oligomers are prepared from hexafluoropropene in a high conversion by contacting gaseous hexafluoropropene with a catalyst comprising an alkali metal fluoride supported on activated charcoal or nickel oxide.Type: GrantFiled: July 18, 1980Date of Patent: October 20, 1981Assignee: Daikin Kogyo Co., Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka
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Patent number: 4288376Abstract: Hexafluoropropene oxide is prepared with good conversion and high selectivity by reacting hexafluoropropene with oxygen in the presence of at least one barium compound selected from the group consisting of barium oxide, barium hydroxide and barium salts as a catalyst.Type: GrantFiled: July 18, 1980Date of Patent: September 8, 1981Assignee: Daikin Kogyo Co., Ltd.Inventors: Yohnosuke Ohsaka, Takashi Tohzuka