Patents by Inventor Toshiaki Sakaki

Toshiaki Sakaki 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: 10131763
    Abstract: The present invention provides a modified natural rubber having a good balance of improved fuel economy, heat-aging resistance, processability, and breaking resistance, and a method for producing such a rubber. The present invention also provides a tire rubber composition and a pneumatic tire which are prepared using the modified natural rubber. The present invention relates to a highly purified, modified natural rubber whose pH is adjusted to 2 to 7.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: November 20, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Hirotoshi Otsuki, Yuka Yokoyama, Tatsuya Miyazaki, Ryo Mashita
  • Patent number: 10066090
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a styrene-butadiene rubber having a styrene content of 30% by mass or more, and also relates to a pneumatic tire formed from the rubber composition.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: September 4, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Masanobu Nakamura, Yuka Yokoyama
  • Patent number: 9862814
    Abstract: Provided are pneumatic tires or studless winter tires that achieve a balanced improvement in fuel economy, reinforcing properties (flex crack growth resistance, abrasion resistance, tensile strength, adhesive strength, resistance to air permeation), grip performance (wet-grip performance, performance on snow and ice), handling stability, and heat aging resistance, and methods for producing such a pneumatic tire or studless winter tire. The present invention relates to a pneumatic tire including at least one component selected from the group consisting of a sidewall, a base tread, a bead apex, a clinch apex, an innerliner, and an undertread, each of which is formed from a rubber composition that contains a highly purified, modified natural rubber whose pH is adjusted to 2 to 7, and carbon black and/or a white filler.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: January 9, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Yuka Yokoyama
  • Patent number: 9856362
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2 to 7, and a silica having a CTAB specific surface area of 180 m2/g or more and a BET specific surface area of 185 m2/g or more, and also relates to a pneumatic tire formed from the rubber composition.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: January 2, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Yuka Yokoyama, Seiji Hatano
  • Patent number: 9732165
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: August 15, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Akira Minagoshi, Yuka Yokoyama
  • Publication number: 20160297954
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a styrene-butadiene rubber having a styrene content of 30% by mass or more, and also relates to a pneumatic tire formed from the rubber composition.
    Type: Application
    Filed: November 27, 2014
    Publication date: October 13, 2016
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki SAKAKI, Masanobu NAKAMURA, Yuka YOKOYAMA
  • Publication number: 20160297947
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2 to 7, and a silica having a CTAB specific surface area of 180 m2/g or more and a BET specific surface area of 185 m2/g or more, and also relates to a pneumatic tire formed from the rubber composition.
    Type: Application
    Filed: November 27, 2014
    Publication date: October 13, 2016
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki SAKAKI, Yuka YOKOYAMA, Seiji HATANO
  • Publication number: 20160297897
    Abstract: Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition.
    Type: Application
    Filed: November 27, 2014
    Publication date: October 13, 2016
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Toshiaki SAKAKI, Akira MINAGOSHI, Yuka YOKOYAMA
  • Publication number: 20160075863
    Abstract: Provided are pneumatic tires or studless winter tires that achieve a balanced improvement in fuel economy, reinforcing properties (flex crack growth resistance, abrasion resistance, tensile strength, adhesive strength, resistance to air permeation), grip performance (wet-grip performance, performance on snow and ice), handling stability, and heat aging resistance, and methods for producing such a pneumatic tire or studless winter tire. The present invention relates to a pneumatic tire including at least one component selected from the group consisting of a sidewall, a base tread, a bead apex, a clinch apex, an innerliner, and an undertread, each of which is formed from a rubber composition that contains a highly purified, modified natural rubber whose pH is adjusted to 2 to 7, and carbon black and/or a white filler.
    Type: Application
    Filed: May 12, 2014
    Publication date: March 17, 2016
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki SAKAKI, Yuka YOKOYAMA
  • Patent number: 9193806
    Abstract: Provided are a method for producing a relatively uniformly epoxidized natural rubber in a simple and inexpensive manner, a rubber composition for tires that includes the epoxidized natural rubber, and a pneumatic tire formed from the rubber composition for tires. The present invention relates to a method for producing an epoxidized natural rubber, including: Step 1 of coagulating natural rubber latex into granules to prepare a granular solid rubber; and Step 2 of treating the granular solid rubber with an epoxidizing liquid to epoxidize the granular solid rubber.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: November 24, 2015
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Toshiaki Sakaki, Lucksanaporn Tarachiwin, Kamolchat Charungchitaree, Hathainat Kum-Ourm
  • Patent number: 9181355
    Abstract: The present invention provides a modified natural rubber having a reduced tan ?, a method for producing the modified natural rubber, a rubber composition produced using the modified natural rubber, and a pneumatic tire produced using the rubber composition. The present invention also provides a modified natural rubber having a reduced tan ?, a method for producing the modified natural rubber, a rubber composition produced using the modified natural rubber and achieving good fuel economy and abrasion resistance at the same time, and a pneumatic tire produced using the rubber composition. The present invention relates to a modified natural rubber having a phosphorus content of 200 ppm or less and a total content of sodium and potassium of 350 ppm or less. The invention also relates to a modified natural rubber having a phosphorus content of 200 ppm or less and a nitrogen content of 0.2% by mass or less.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: November 10, 2015
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Naoya Ichikawa, Toshiaki Sakaki, Lucksanaporn Tarachiwin, Kamalin Kanyawararak
  • Publication number: 20140378619
    Abstract: Provided are a method for producing a relatively uniformly epoxidized natural rubber in a simple and inexpensive manner, a rubber composition for tires that includes the epoxidized natural rubber, and a pneumatic tire formed from the rubber composition for tires. The present invention relates to a method for producing an epoxidized natural rubber, including: Step 1 of coagulating natural rubber latex into granules to prepare a granular solid rubber; and Step 2 of treating the granular solid rubber with an epoxidizing liquid to epoxidize the granular solid rubber.
    Type: Application
    Filed: January 22, 2013
    Publication date: December 25, 2014
    Inventors: Toshiaki Sakaki, Lucksanaporn Tarachiwin, Kamolchat Charungchitaree, Hathainat Kum-Ourm
  • Patent number: 8809450
    Abstract: The present invention provides a modified natural rubber which simultaneously achieves good fuel economy and good heat-aging resistance, and the production method thereof. The present invention also provides a tire rubber composition and a pneumatic tire which are produced using the modified natural rubber. The present invention relates to a modified natural rubber which is obtainable by treating a rubber coagulated from a saponified natural rubber latex, with a basic compound and then with an acidic compound.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: August 19, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Toshiaki Sakaki, Naoya Ichikawa, Masako Iwamoto
  • Patent number: 8658728
    Abstract: The present invention relates to a natural rubber that contains 200 ppm or less of phosphorus.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: February 25, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Naoya Ichikawa, Toshiaki Sakaki, Sumiko Miyazaki, Tomohiro Hosokawa, Ai Matsuura
  • Patent number: 8633275
    Abstract: The present invention provides a rubber composition for a breaker, which achieves both good fuel economy and good breaking performance while simultaneously having excellent processability, and a pneumatic tire including a breaker produced using the rubber composition. The present invention relates to a rubber composition for a breaker, including: a rubber component that contains a modified natural rubber, the rubber having a phosphorus content of 200 ppm or less; and carbon black and/or a white filler, wherein the rubber composition contains 5% by mass or more of the modified natural rubber based on 100% by mass of the rubber component.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: January 21, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Toshiaki Sakaki, Naoya Ichikawa, Masako Iwamoto
  • Patent number: 8563628
    Abstract: The present invention provides an oil extended rubber for a tire, which is obtained by a process for preparing an oil extended rubber for a tire, comprising: (a) a step of preparing an oil-in-water type emulsion by emulsifying a vegetable oil having an iodine value of not less than 135 with a surfactant; (b) a step of mixing said emulsion of vegetable oil and a modified natural rubber latex, and then maturing the mixture; and (c) a step of coagulating the mixture obtained in the step (b) to obtain a lump of a rubber.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: October 22, 2013
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Toshiaki Sakaki, Naoya Ichikawa, Takayuki Hattori, Chee-Cheong Ho, Choong Dick Hean
  • Publication number: 20130066021
    Abstract: The present invention provides a modified natural rubber having a reduced tan ?, a method for producing the modified natural rubber, a rubber composition produced using the modified natural rubber, and a pneumatic tire produced using the rubber composition. The present invention also provides a modified natural rubber having a reduced tan ?, a method for producing the modified natural rubber, a rubber composition produced using the modified natural rubber and achieving good fuel economy and abrasion resistance at the same time, and a pneumatic tire produced using the rubber composition. The present invention relates to a modified natural rubber having a phosphorus content of 200 ppm or less and a total content of sodium and potassium of 350 ppm or less. The invention also relates to a modified natural rubber having a phosphorus content of 200 ppm or less and a nitrogen content of 0.2% by mass or less.
    Type: Application
    Filed: June 9, 2011
    Publication date: March 14, 2013
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Naoya Ichikawa, Toshiaki Sakaki, Lucksanaporn Tarachiwin, Kamalin Kanyawararak
  • Publication number: 20120184671
    Abstract: The present invention provides a modified natural rubber which simultaneously achieves good fuel economy and good heat-aging resistance, and the production method thereof. The present invention also provides a tire rubber composition and a pneumatic tire which are produced using the modified natural rubber. The present invention relates to a modified natural rubber which is obtainable by treating a rubber coagulated from a saponified natural rubber latex, with a basic compound and then with an acidic compound.
    Type: Application
    Filed: January 13, 2012
    Publication date: July 19, 2012
    Inventors: Toshiaki Sakaki, Naoya Ichikawa, Masako Iwamoto
  • Publication number: 20120065324
    Abstract: The present invention provides an oil extended rubber for a tire, which is obtained by a process for preparing an oil extended rubber for a tire, comprising: (a) a step of preparing an oil-in-water type emulsion by emulsifying a vegetable oil having an iodine value of not less than 135 with a surfactant; (b) a step of mixing said emulsion of vegetable oil and a modified natural rubber latex, and then maturing the mixture; and (c) a step of coagulating the mixture obtained in the step (b) to obtain a lump of a rubber.
    Type: Application
    Filed: September 19, 2011
    Publication date: March 15, 2012
    Inventors: Toshiaki Sakaki, Naoya Ichikawa, Takayuki Hattori, Chee-Cheong Ho, Choong Dick Hean
  • Patent number: 8100157
    Abstract: A rubber composition for a tire, in which a specific tackifier is compounded, and tackiness and various physical properties are improved, compared with compounding a petroleum resin or a terpene resin, is provided. The rubber composition for a tire comprising an alkyd resin and a pneumatic tire using the same. It is preferable that a material derived from a resource other than petroleum, particularly, a material derived from animal and/or vegetable, and more particularly, a material derived from an animal oil and/or a vegetable oil is contained in the alkyd resin, and it is preferable that unsaturated polybasic acid is contained in the alkyd resin.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: January 24, 2012
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Takayuki Hattori, Katsumi Terakawa, Naoya Ichikawa, Toshiaki Sakaki, Gan Seng Neon, Lee Siang Yin