Patents by Inventor Yukoh Takahashi
Yukoh Takahashi 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: 5049604Abstract: A stabilized resin composition comprising a resin, a piperidine derivative represented by the formula (III) ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group having 1 to 3 carbom atoms; R.sub.2 is a hydrogen atom or an alkyl group having from 1 to 2 carbon atoms; and R.sub.3 and R.sub.4 are each independently an alkyl group having 1 to 12 carbon atoms, a phenol-type antioxidant and a sulfur-containing antioxidant. The composition simultaneously meets heat resistance, oxidation resistance and light resistance requirements.Type: GrantFiled: October 19, 1990Date of Patent: September 17, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Takeo Fujii, Tamaki Ishii, Shinichi Yachigo, Tatsuo Kaneoya, Yukoh Takahashi, Yuzo Maegawa, Haruki Okamura, Eizo Okino
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Patent number: 4985479Abstract: A stabilized polyolefin composition having improved weathering resistance is provided, whereby the following four components are incorporated into a polyolefin:(A) a hindered piperidine compound having a molecular weight of more than 750, such as poly-{[6-morpholino-1,3,5-triazine-2,4-diyl][2,2,6,6-tetramethyl-4-piperid yl)imino]hexamethylene[2,2,6,6-tetramethyl-4-piperidyl)imino]},(B) a hindered piperidine compound having a molecular weight of less than 500, such as bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate,(C) a benzoate compound such as 2,4-di-t-butylphenyl 3,5-di-t-butyl-4-hydroxybenzoate, and(D) a phosphorus-containing compound such as bis(2,4-di-t-butylphenyl) pentaerythritol diphosphite.Type: GrantFiled: March 28, 1989Date of Patent: January 15, 1991Assignee: Sumitomo Chemical Company, Ltd.Inventors: Hideo Nagasaki, Shinichi Yachigo, Takeshi Takata, Hiroki Yamamoto, Yukoh Takahashi
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Patent number: 4812494Abstract: A styrene polymer is stabilized by incorporating into said styrene polymer(A) a hindered piperidine compound represented by the formula ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,R.sub.2 is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, andR.sub.3 and R.sub.4 are each independently an alkyl group having 1 to 4 carbon atoms; and(B) a benzotriazole compound selected from the group consisting of 2-(2-hydroxy-5-methylphenyl)benzotriazole and 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole.Type: GrantFiled: December 4, 1987Date of Patent: March 14, 1989Assignee: Sumitomo Chemical Company, LimitedInventors: Hideo Nagasaki, Shinichi Yachigo, Tamaki Ishii, Masakatsu Yoshimura, Yukoh Takahashi, Hiroki Yamamoto
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Patent number: 4774274Abstract: A process for producing a bisphenol compound useful as deterioration preventor capable of stabilizing organic substances against the decompositions caused by heat, light and oxygen, represented by the following general formula: ##STR1## wherein R.sub.1 represents alkyl group having 1 to 3 carbon atoms, alkenyl group having 2 to 4 carbon atoms, phenyl group or 2-phenylethenyl group; R.sub.2 represents alkyl group having 1 to 5 carbon atoms, or cyclohexyl group; R.sub.3 represents alkyl group having 1 to 9 carbon atoms, cyclohexyl group or phenyl group; and R.sub.4 represents alkyl group having 1 to 11 carbon atoms or phenyl group, which comprises reacting a carboxylic acid represented by the following general formula: ##STR2## wherein R.sub.1 is as defined above, with a bisphenol compound represented by the following general formula: ##STR3## wherein R.sub.2, R.sub.3 and R.sub.Type: GrantFiled: June 22, 1987Date of Patent: September 27, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Takeshi Takata, Shin-ichi Yachigo, Tatsuo Kaneoya, Haruki Okamura, Yukoh Takahashi
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Patent number: 4732923Abstract: A butadiene polymer composition having incorporated the following stabilizers therein:A phenolic compound (I) of the formula: ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.4 alkyl group, and a sulfur-containing compound (II) represented by the general formula, ##STR2## wherein R.sub.2 and R.sub.3 independently represent a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group, and R.sub.4 represents a C.sub.3 -C.sub.18 alkyl group, wherein the weight ratio of (I) to (II) is 1 to 0.5-10. The butadiene polymer composition of the present invention is quite effective to prevent gel formation caused by heat, especially in the absence of oxygen.Type: GrantFiled: July 16, 1986Date of Patent: March 22, 1988Assignee: Sumitomo Chemical Co., Ltd.Inventors: Takeshi Takata, Shinichi Yachigo, Yukoh Takahashi, Manji Sasaki, Taisuke Okita
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Patent number: 4725634Abstract: A stabilizer for synthetic resins containing as an effective ingredient a hindered piperidine compound represented by the general formula: ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.18 alkyl group, R.sub.2 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, n represents an integer of 1 to 12, and C.sub.n H.sub.2n represents a straight-chain or branched alkylene group.Type: GrantFiled: April 16, 1986Date of Patent: February 16, 1988Assignee: Sumitomo Chemical Company, Ltd.Inventors: Tamaki Ishii, Shinichi Yachigo, Haruki Okamura, Yuzo Maegawa, Eizo Okino, Yukoh Takahashi, Hiroki Yamamoto
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Patent number: 4719037Abstract: Piperidine derivatives represented by the general formula (1) ##STR1## (wherein R.sub.1 is a hydrogen atom, an alkyl group of 1 to 3 carbon atoms or an acyl group of 2 to 18 carbon atoms; and k, m and n each are independently an integer of 1 to 3), a process for producing said derivatives, and stabilizers for organic substances containing said derivatives as an active component.Type: GrantFiled: July 21, 1986Date of Patent: January 12, 1988Assignee: Sumitomo Chemical Company, LimitedInventors: Yukoh Takahashi, Yuzo Maegawa, Hiroki Yamamoto, Tatsuo Kaneoya, Haruki Okamura, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4670489Abstract: The present invention relates to a piperidine derivative represented by the general formula (I), ##STR1## wherein R.sub.1 is a uni- or divalent carboxylic acid residue, R.sub.2 is a hydrogen atom or a C.sub.1 -C.sub.3 alkyl or C.sub.1 -C.sub.18 acyl group, l is an integer of 1 to 3 and n is 1 or 2,its production and a stabilizer for organic substances containing it as an effective ingredient.Type: GrantFiled: December 5, 1985Date of Patent: June 2, 1987Assignee: Sumitomo Chemical Company, Ltd.Inventors: Yukoh Takahashi, Tatsuo Kaneoya, Eizo Okino, Yuzo Maegawa, Haruki Okamura, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4670488Abstract: The present invention relates to a piperidine derivative represented by the general formula (I), ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom or a C.sub.1 -C.sub.3 alkyl or C.sub.2 -C.sub.20 acyl group, R.sub.3 represents a hydrogen atom or a C.sub.1 -C.sub.20 alkyl, C.sub.6 -C.sub.20 aryl, C.sub.7 -C.sub.20 aralkyl or C.sub.2 -C.sub.20 acyl group, and l represents 1 to 3, and a stabilizer for organic substances containing said piperidine derivative as an effective ingredient.Type: GrantFiled: December 4, 1985Date of Patent: June 2, 1987Assignee: Sumitomo Chemical Co., Ltd.Inventors: Yuzo Maegawa, Yukoh Takahashi, Eizo Okino, Tatsuo Kaneoya, Haruki Okamura, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4578410Abstract: There are provided piperidine derivatives having the formula ##STR1## wherein R represents a hydrogen atom or a C.sub.1 -C.sub.3 group, and R.sup.2 and R.sup.3 represent a hydrogen atom or taken together, form ##STR2## There is also provided a method for producing the above compounds which comprises reacting a tricetonamine derivative represented by the formula ##STR3## wherein R has the same meaning as described above, or its salt with sorbitol.The subject piperdine derivatives are useful as stabilizers for preventing the deterioration of polymers by light.Type: GrantFiled: August 27, 1984Date of Patent: March 25, 1986Assignee: Sumitomo Chemical Company, LimitedInventors: Yukoh Takahashi, Takeo Fujii, Masahisa Shionoya, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4562281Abstract: Bisphenol derivatives of the formula (I), ##STR1## are produced by reacting a carboxylic acid, RCOOH (II), with a bisphenol of the formula (III), ##STR2## adding a halogenating agent in the presence of a dehydrohalogenating agent. The product bisphenol derivatives are useful as antioxidants.Type: GrantFiled: December 14, 1983Date of Patent: December 31, 1985Assignee: Sumitomo Chemical Company, LimitedInventors: Yukoh Takahashi, Yutaka Terada, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4539355Abstract: Phosphorus-containing compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are each a hydrogen atom or a lower alkyl group, and R.sup.3 is a lower alkyl or phenyl group. These compounds may be used as stabilizers against the action of heat, light and oxygen for organic substances and especially polyolefin resins. These phosphorus-containing compounds may be used in conjunction with other stabilizers such phenol-type and sulfur-containing antioxidants, especially in polyolefin resin compositions to produce a polyolefin resin composition having excellent resistance to light, heat and oxygen. The present invention also relates to a method of producing the compounds of the aforementioned formula by reacting ##STR2## with a disubstituted phosphonate of the formula ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined above.Type: GrantFiled: June 16, 1983Date of Patent: September 3, 1985Assignee: Sumitomo Chemical Company, LimitedInventors: Yukoh Takahashi, Shinichi Yachigo, Tamaki Ishii
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Patent number: 4525514Abstract: A stabilizer for polymeric substances made up of a sulfur-containing compound of the formula: ##STR1## wherein R.sub.1 represents an alkyl group having 4 to 20 carbon atoms and a phenolic compound of the general formula: ##STR2## wherein R.sub.2 represents an alkyl group having 1 to 4 carbon atoms, in the ratio (I):(II) of 1:0.1-2 by weight.The combination of the above stabilizer with a polymeric substance, such as synthetic rubber is also contemplated herein.Type: GrantFiled: May 17, 1984Date of Patent: June 25, 1985Assignee: Sumitomo Chemical Co., Ltd.Inventors: Shinichi Yachigo, Tamaki Ishii, Yukoh Takahashi, Yutaka Terada
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Patent number: 4511491Abstract: Phenolic compounds and methods of producing such phenolic compounds are disclosed, said compounds being of the formula: ##STR1## wherein n' is an integer from 1 to 3, and R.sub.1 is a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms or an acyl group having 1 to 5 carbon atoms.These compounds are suitable as stabilizers for synthetic resins with at least one sulfur compound of the following formulas: ##STR2## wherein R.sub.2 is an alkyl group having 4 to 20 carbon atoms, and ##STR3## wherein R.sub.3 is an alkyl group having 3 to 18 carbon atoms, and R.sub.4 and R.sub.5 each independently is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,in the ratio (I):(II) of 1:0.5-15 by weight.Type: GrantFiled: July 15, 1983Date of Patent: April 16, 1985Assignee: Sumitomo Chemical Co., Ltd.Inventors: Tamaki Ishii, Shinichi Yachigo, Yukoh Takahashi
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Patent number: 4507417Abstract: A novel stabilizing mixture composed of 1 1,3,5-tris 2-[3-(3-t-butyl-4-hydroxy-5-methyl-phenyl)-propionyloxyl] ethyl isocyanuric acid (I) and at least one sulfur-containing compound (II) selected from compounds represented by the general formulas (II-1) and (II-2): ##STR1## wherein R.sub.1 is an alkyl group having 4 to 20 carbon atoms, and ##STR2## wherein R.sub.2 is an alkyl group having 3 to 18 carbon atoms, and R.sub.3 and R.sub.4 each independently is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, is useful as a stabilizer for synthetic resins.Type: GrantFiled: October 17, 1983Date of Patent: March 26, 1985Assignee: Sumitomo Chemical Company, LimitedInventors: Tamaki Ishii, Shinichi Yachigo, Yukoh Takahashi
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Patent number: 4448915Abstract: An acetylene carbamide derivative of the general formula (I): ##STR1## wherein A represents ##STR2## wherein R.sub.1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, is disclosed. A process for producing the acetylene carbamide derivative of the general formula (I) is also disclosed. The acetylene carbamide derivative of the invention is useful as a stabilizer for organic substances from heat and oxidation.Type: GrantFiled: October 19, 1982Date of Patent: May 15, 1984Assignee: Sumitomo Chemical Co., Ltd.Inventors: Yutaka Terada, Yukoh Takahashi, Shinichi Yachigo, Tamaki Ishii