Patents by Inventor Tatsuji Ishida
Tatsuji Ishida 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: 11926730Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: GrantFiled: April 17, 2023Date of Patent: March 12, 2024Assignee: Oji Holdings CorporationInventors: Tatsuji Ishida, Yoshimune Okuyama, Masahiro Nakata, Tadakazu Ishiwata
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Publication number: 20230416479Abstract: Provided is a polypropylene film having a high dielectric breakdown strength at high temperatures. Provided is a polypropylene film in which a polypropylene resin constituting the polypropylene film has a molecular-weight distribution (Mw/Mn) of the weight-average molecular weight Mw to the number-average molecular weight Mn of has a Z-average molecular weight Mz of 950,000-1,500,000, and has a weight proportion w of 2.6-4.2% in an integral molecular-weight distribution curve when the logarithmic molecular weight Log(M) is 4.0.Type: ApplicationFiled: November 15, 2021Publication date: December 28, 2023Inventors: Tatsuji ISHIDA, Takeshi TOMINAGA, Tadakazu ISHIWATA
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Publication number: 20230340245Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: ApplicationFiled: April 17, 2023Publication date: October 26, 2023Inventors: Tatsuji ISHIDA, Yoshimune OKUYAMA, Masahiro NAKATA, Tadakazu ISHIWATA
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Patent number: 11661507Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: GrantFiled: September 9, 2022Date of Patent: May 30, 2023Assignee: Oji Holdings CorporationInventors: Tatsuji Ishida, Yoshimune Okuyama, Masahiro Nakata, Tadakazu Ishiwata
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Publication number: 20230044276Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: ApplicationFiled: September 9, 2022Publication date: February 9, 2023Inventors: Tatsuji ISHIDA, Yoshimune OKUYAMA, Masahiro NAKATA, Tadakazu ISHIWATA
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Patent number: 11492475Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: GrantFiled: December 26, 2018Date of Patent: November 8, 2022Assignee: OJI HOLDINGS CORPORATIONInventors: Tatsuji Ishida, Yoshimune Okuyama, Masahiro Nakata, Tadakazu Ishiwata
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Publication number: 20200377706Abstract: A polypropylene film which is capable of suppressing blocking in a rolled polypropylene film. The polypropylene film has a first surface and a second surface, contains a polypropylene resin as a main component, and is configured such that: the Svk value (SvkA) of the first surface is 0.005 ?m or more and 0.030 ?m or less; the Spk value (SpkA) of the first surface is more than 0.035 ?m and 0.080 ?m or less; the Svk value (SvkB) of the second surface is 0.005 ?m or more and 0.030 ?m or less; and the Spk value (SpkB) of the second surface is 0.015 ?m or more and 0.035 ?m or less.Type: ApplicationFiled: December 26, 2018Publication date: December 3, 2020Inventors: Tatsuji ISHIDA, Yoshimune OKUYAMA, Masahiro NAKATA, Tadakazu ISHIWATA
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Patent number: 10629375Abstract: A film for a capacitor having a plurality of layers, the film for capacitors satisfying the following relational expression (1): Cmo/Cmu?1.1 wherein Cmu is an oxygen gas permeability coefficient of the film for the capacitor, and Cmo is an oxygen gas permeability coefficient of an equivalent film that would be obtained if the film for the capacitor were to be formed as a uniform single layer, and having a thickness of 1 to 35 ?m.Type: GrantFiled: April 28, 2016Date of Patent: April 21, 2020Assignee: OJI HOLDINGS CORPORATIONInventors: Akihiro Kakehi, Tatsuji Ishida, Yoshimune Okuyama
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Patent number: 10294356Abstract: The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a biaxially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 includes wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.Type: GrantFiled: August 31, 2018Date of Patent: May 21, 2019Assignee: OJI HOLDINGS CORPORATIONInventors: Tatsuji Ishida, Masahiro Nakata, Tadakazu Ishiwata, Akihiro Kakehi, Yoshinori Matsuo, Masahiro Yoda
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Publication number: 20180371223Abstract: The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a biaxially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 includes wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.Type: ApplicationFiled: August 31, 2018Publication date: December 27, 2018Applicant: OJI HOLDINGS CORPORATIONInventors: Tatsuji ISHIDA, Masahiro NAKATA, Tadakazu ISHIWATA, Akihiro KAKEHI, Yoshinori MATSUO, Masahiro YODA
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Patent number: 10093792Abstract: The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a bi-axially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 inclusive, wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.Type: GrantFiled: February 10, 2015Date of Patent: October 9, 2018Assignee: OJI HOLDINGS CORPORATIONInventors: Tatsuji Ishida, Masahiro Nakata, Tadakazu Ishiwata, Akihiro Kakehi, Yoshinori Matsuo, Masahiro Yoda
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Publication number: 20180118904Abstract: A chief object is to provide a biaxially stretched polypropylene film for capacitors that is excellent in dielectric breakdown resistance at high temperatures and that can be formed into an ultra-thin film. This relates to a biaxially stretched polypropylene film for capacitors that contains a polypropylene resin having ethylene units, wherein the content of the ethylene units is 7.5 mol % or less based on the total amount of propylene units and ethylene units detected from the film.Type: ApplicationFiled: April 14, 2016Publication date: May 3, 2018Applicant: OJI HOLDINGS CORPORATIONInventors: Masahiro YODA, Tatsuji ISHIDA, Tadakazu ISHIWATA, Masahiro NAKATA
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Publication number: 20180114642Abstract: A film for a capacitor having a plurality of layers, the film for capacitors satisfying the following relational expression (1): Cmo/Cmu?1.1 wherein Cmu is an oxygen gas permeability coefficient of the film for the capacitor, and Cmo is an oxygen gas permeability coefficient of an equivalent film that would be obtained if the film for the capacitor were to be formed as a uniform single layer, and having a thickness of 1 to 35 ?m.Type: ApplicationFiled: April 28, 2016Publication date: April 26, 2018Inventors: Akihiro KAKEHI, Tatsuji ISHIDA, Yoshimune OKUYAMA
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Publication number: 20170121515Abstract: The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, winch has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a bi-axially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 inclusive, wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.Type: ApplicationFiled: February 10, 2015Publication date: May 4, 2017Applicant: OJI HOLDINGS CORPORATIONInventors: Tatsuji ISHIDA, Masahiro NAKATA, Tadakazu ISHIWATA, Akihiro KAKEHI, Yoshinori MATSUO, Masahiro YODA
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Publication number: 20070003716Abstract: Highly versatile composite fine particles that can coexist with a wide variety of other components, a dispersion thereof, and a method of producing such a dispersion. Furthermore, by using these composite fine particles, there are also provided a high-quality ink jet recording material and a method of producing this ink jet recording material. Composite fine particles, which include cationic fine particles that exhibit a positive zeta potential when dispersed within water to form a dispersion and an anionic compound that is supported on the surface of the cationic fine particles, wherein the composite fine particles exhibit a negative zeta potential when dispersed within water to form a dispersion, are added to the coating layer of an ink jet recording material.Type: ApplicationFiled: June 26, 2006Publication date: January 4, 2007Inventors: Shigeru Suzuki, Tatsuji Ishida