Patents by Inventor Kazuhisa Kuroda
Kazuhisa Kuroda 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: 5109056Abstract: Disclosed herein is a polypropylene molded article characterized in that the content of hexane and/or heptane therein is from 0.1 to 5 ppm and the content of 2,4-dimethyl-heptene-1 therein is from 0.1 to 5 ppm. It has a greatly lowered level of odor and hence is suitable for food packaging.Type: GrantFiled: November 16, 1990Date of Patent: April 28, 1992Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiharu Fukui, Kazuhisa Kuroda
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Patent number: 5100930Abstract: Disclosed herein is a food container of a resin composition composed of a polyolefin and an inorganic filler, said resin composition containing (i) a phenolic antioxidant and (ii) a slip agent and/or antistatic agent, said phenolic antioxidant being at least one kind selected from .beta.-(4-hydroxy-3-t-butyl-5-alkylphenyl)propionic acid esters, hindered phenols having an isocyanuric acid ester, 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, specific phenol compounds, and 6-hydroxychroman compounds. The food container has a low level of offensive odors and discoloration.Type: GrantFiled: June 28, 1990Date of Patent: March 31, 1992Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiharu Fukui, Kazuhisa Kuroda
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Patent number: 5086099Abstract: An inorganic filler-containing polyolefin composition which comprises100 parts by weight of a polyolefin,1-100 parts by weight of an inorganic filler,0.01-1.0 part by weight of a phenolic antioxidant represented by the general formula (I) shown below, andat least one compound selected from the group consisting of the compounds represented by the general formulas (II) to (IV) shown below, and optionally 0.01-1.0 part by weight of a sulfur antioxidant and/or 0.01-2.0 parts by weight of a light stabilizer. ##STR1## wherein R.sub.1 represents an alkyl group of 1-3 carbon atoms,R.sub.2 --CO--NH--(CH.sub.2).sub.n --HN--CO--R.sub.2 (II)wherein R.sub.2 represents an alkyl group or an alkenyl group of 5-21 carbon atoms, and n is an integer of 1 to 6.R.sub.3 --CONH.sub.2 (III)wherein R.sub.3 represents an alkyl group of an alkenyl group of 5-21 carbon atoms, ##STR2## wherein R.sub.Type: GrantFiled: October 31, 1990Date of Patent: February 4, 1992Assignee: Sumitomo Chemical Co., Ltd.Inventors: Yoshiharu Fukui, Kazuhisa Kuroda
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Patent number: 5086100Abstract: An inorganic filler-containing polyolefin composition which comprises100 parts by weight of a polyolefin,1-100 parts by weight of an inorganic filler.0.01-1.0 part by weight of a phenolic antioxidant represented by the general formula (I) shown below, andat least one compound selected from the group consisting of the compounds represented by the general formulas (II) to (IV) shown below, and optionally 0.01-1.0 part by weight of a sulfur antioxidant and/or 0.01-2.0 parts by weight of a light stabilizer. ##STR1## wherein R.sub.1 represents an alkyl group of 1-3 carbon atoms,R.sub.2 --CO--NH--(CH.sub.2).sub.n --HN--CO--R.sub.2 (II)wherein R.sub.2 represents an alkyl group or an alkenyl group of 5-21 carbon atoms, and n is an integer of 1 to 6.R.sub.3 --CONH.sub.2 (III)wherein R.sub.3 represents an alkyl group or an alkenyl group of 5-21 carbon atoms. ##STR2## wherein R.sub.Type: GrantFiled: October 31, 1990Date of Patent: February 4, 1992Assignee: Sumitomo Chemical Co., Ltd.Inventors: Yoshiharu Fukui, Kazuhisa Kuroda
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Patent number: 4985480Abstract: An inorganic filler-containing polyolefin composition which comprises100 parts by weight of a polyolefin,1-100 parts by weight of an inorganic filler.0.01-1.0 part by weight of a phenolic antioxidant represented by the general formula (I) shown below, andat least one compound selected from the group consisting of the compounds represented by the general formulas (II) to (IV) shown below, and optionally 0.01-1.0 part by weight of a sulfur antioxidant and/or 0.01-2.0 parts by weight of a light stabilizer. ##STR1## wherein R.sub.1 represents an alkyl group of 1-3 carbon atoms,R.sub.2 --CO--NH--(CH.sub.2).sub.n --HN--CO--R.sub.2 (II)wherein R.sub.2 represents an alkyl group or an alkenyl group of 5-21 carbon atoms, and n is an integer of 1 to 6.R.sub.3 --COHN.sub.2 (III)wherein R.sub.3 represents an alkyl group or an alkenyl group of 5-21 carbon atoms. ##STR2## wherein R.sub.Type: GrantFiled: May 8, 1989Date of Patent: January 15, 1991Assignee: Sumitomo Chemical Company, Ltd.Inventors: Yoshiharu Fukui, Kazuhisa Kuroda
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Patent number: 4963605Abstract: The invention relates to a stabilized polyolefin composition, which composition is stabilized against deterioration caused by contact with heavy metals and improved in coloration properties. This is achieved by blending a polyolefin with:(A) a phenolic compound represented by the formula (I), ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.3 alkyl group, (B) a metal deactivator having one or more ##STR2## groups in the side chain, and (C) a sulfur-containing compound represented by the formula (II-1), (II-2), (II-3) or (II-4): ##STR3## wherein R.sub.2 represents a C.sub.4 -C.sub.20 alkyl group, ##STR4## wherein R.sub.3 represents a C.sub.4 -C.sub.20 alkyl group, ##STR5## wherein R.sub.4 represents a C.sub.3 -C.sub.18 alkyl group, and R.sub.5 and R.sub.6 independently represent a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group, ##STR6## wherein R.sub.7 represents a C.sub.3 -C.sub.18 alkyl group.Type: GrantFiled: March 16, 1989Date of Patent: October 16, 1990Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiharu Fukui, Kazuhisa Kuroda, Tamaki Ishii, Manji Sasaki
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Patent number: 4839408Abstract: The invention relates to a stabilized polyolefin composition, which composition is stabilized against deterioration caused by contact with heavy metals and improved in coloration properties. This is achieved by blending a polyolefin with:(A) a phenolic compound represented by the formula (I), ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.3 alkyl group, (B) a metal deactivator having one or more ##STR2## groups in the side chain, and (C) a sulfur-containing compound represented by the formula (II-1), (II-2), (II-3) or (II-4): ##STR3## wherein R.sub.2 represents a C.sub.4 -C.sub.20 alkyl group, ##STR4## wherein R.sub.3 represents a C.sub.4 -C.sub.20 alkyl group, ##STR5## wherein R.sub.4 represents a C.sub.3 -C.sub.18 alkyl group, and R.sub.5 and R.sub.6 independently represent a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group, ##STR6## wherein R.sub.7 represents a C.sub.3 -C.sub.18 alkyl group.Type: GrantFiled: August 15, 1988Date of Patent: June 13, 1989Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiharu Fukui, Kazuhisa Kuroda, Tamaki Ishii, Manji Sasaki