Patents by Inventor Junko Matsushita

Junko Matsushita 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: 8809464
    Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer, and reacting the reactive polymer with a halosilane compound containing an amino group.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: August 19, 2014
    Assignee: Bridgestone Corporation
    Inventors: Terrence E. Hogan, Steven Luo, Yoichi Ozawa, Junko Matsushita, Ryuji Nakagawa, Eiju Suzuki, Ken Tanaka
  • Publication number: 20140228525
    Abstract: This invention relates to a rubber composition being excellent in the low heat buildup and fracture properties (resistance to crack growth). and more particularly to a rubber composition, characterized by compounding 10-100 parts by mass of an inorganic filler and/or carbon black based on 100 parts by mass of a rubber component including not less than 10 mass % of a modified conjugated diene-based polymer having a cis-1,4 bond content of not less than 90% and a vinyl bond content of not more than 1.2% and a primary amino group. In this case, the modified conjugated diene-based polymer is obtained by (1) reacting the predetermined conjugated diene-based polymer having an active terminal with a compound having two or more predetermined functional groups and (2) further reacting the resulting product with a compound having a primary amino group.
    Type: Application
    Filed: April 22, 2014
    Publication date: August 14, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Junko MATSUSHITA, Yoichi OZAWA
  • Publication number: 20140179861
    Abstract: Provided is a block copolymer of a conjugated diene compound and a non-conjugated olefin, a rubber composition including the block copolymer, a crosslinked rubber obtained by crosslinking the rubber composition, and a tire using the rubber composition or the crosslinked rubber composition. The copolymer of the present invention is a block copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer having a peak area in a temperature range in a range of 70° C. to 110° C. that accounts for at least 60% of a peak area in a range of 40° C. to 140° C. and a peak area in a range of 110° C. to 140° C. that accounts for 20% or less of a peak area in a range of 40° C. to 140° C., the peak areas being measured by the differential scanning calorimetry (DSC) according to JIS K 7121-1987.
    Type: Application
    Filed: May 29, 2012
    Publication date: June 26, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Patent number: 8729184
    Abstract: This invention relates to a rubber composition being excellent in the low heat buildup and fracture properties (resistance to crack growth). and more particularly to a rubber composition, characterized by compounding 10-100 parts by mass of an inorganic filler and/or carbon black based on 100 parts by mass of a rubber component including not less than 10 mass % of a modified conjugated diene-based polymer having a cis-1,4 bond content of not less than 90% and a vinyl bond content of not more than 1.2% and a primary amino group. In this case, the modified conjugated diene-based polymer is obtained by (1) reacting the predetermined conjugated diene-based polymer having an active terminal with a compound having two or more predetermined functional groups and (2) further reacting the resulting product with a compound having a primary amino group.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: May 20, 2014
    Assignee: Bridgestone Corporation
    Inventors: Junko Matsushita, Yoichi Ozawa
  • Patent number: 8708502
    Abstract: The projection type image display apparatus is equipped with a lamp unit (22), an optical block (21) which modulates light from the lamp unit and projects an image signal, a circuit board (24) having via holes and on which an external connector (25) is mounted, and a cabinet (2) for housing the aforementioned elements. The display apparatus is equipped with a back cover (26) provided to cover around the external connector from the outside and a dustproof cover (29) provided to cover around the external connector from the inside. A closed space is formed by the circuit board, the back cover (26) and the dustproof cover (29), and the dustproof cover closely shields at least a space below the circuit board from the exterior. Excellent dustproof characteristics enabling use even in installation environments with a large amount of dust and dirt can be obtained.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: April 29, 2014
    Assignee: Panasonic Corporation
    Inventors: Junko Matsushita, Shunsuke Okamoto, Takanobu Taniyama, Masanori Goto, Tomohiro Murota
  • Publication number: 20140018493
    Abstract: The present invention provides a random copolymer that is used for manufacturing a tire having excellent rollability and wear resistance and that includes randomly arranged monomer units of a conjugated diene compound and of a non-conjugated olefin, a rubber composition containing the random copolymer, a cross-linked rubber composition obtained by crosslinking the rubber composition, and a tire manufactured by using the rubber composition or the cross-linked rubber composition. A copolymer of a conjugated diene compound and a non-conjugated olefin, including a random copolymer having randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, and containing, by more than 30 mol %, a unit derived from the conjugated diene compound.
    Type: Application
    Filed: February 2, 2012
    Publication date: January 16, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Publication number: 20140005327
    Abstract: The present invention provides a random copolymer that is used for manufacturing a rubber having high fracture strength and excellent low loss properties (low heat generation properties) and that includes randomly arranged monomer units of a conjugated diene compound and of a non-conjugated olefin, a rubber composition containing the random copolymer, a cross-linked rubber composition obtained by crosslinking the rubber composition, and a tire manufactured by using the rubber composition or the cross-linked rubber composition. A copolymer of a conjugated diene compound and a non-conjugated olefin includes a random copolymer having randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, which random copolymer contains, by at least 5 mol %, alternate bonding units of the conjugated diene compound and the non-conjugated olefin in a unit derived from the non-conjugated olefin.
    Type: Application
    Filed: February 3, 2012
    Publication date: January 2, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Publication number: 20140005321
    Abstract: The present invention provides a copolymer of a conjugated diene compound and a non-conjugated olefin that is used for manufacturing rubber excellent in low heat generation properties, heat resistance, ozone resistance (weather resistance), a rubber composition containing the copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a tire manufactured by using the rubber composition or the crosslinked rubber composition. In the copolymer of a conjugated diene compound and a non-conjugated olefin, the content of 1,2 adduct units (including 3,4 adduct units) of a unit derived from the conjugated diene compound is 5% or less.
    Type: Application
    Filed: February 2, 2012
    Publication date: January 2, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Publication number: 20140005296
    Abstract: The present invention provides a copolymer of a conjugated diene compound and a non-conjugated olefin that is used for manufacturing a rubber excellent in crack growth resistance, heat resistance and ozone resistance and that includes a cis-1,4 bond at a unit derived from the conjugated diene compound, a rubber composition containing the copolymer, a rubber composition for tire treads using the rubber composition for tire tread members, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a tire using the rubber composition or the crosslinked rubber composition. In the copolymer of a conjugated diene compound and a non-conjugated olefin, the cis-1,4 bond content of a unit derived from the conjugated diene compound is more than 92%.
    Type: Application
    Filed: February 1, 2012
    Publication date: January 2, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Publication number: 20130324660
    Abstract: The present invention provides a rubber composition that is used for manufacturing a rubber excellent in weather resistance, fracture resistance and crack growth resistance, and that contains a conjugated diene compound/non-conjugated olefin copolymer, a conjugate diene-based polymer and a non-conjugated diene compound/non-conjugated olefin copolymer, a rubber composition for tire side use using the rubber composition for tire sidewall members, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a tire. The rubber composition includes: (A) a conjugated diene compound/non-conjugated olefin copolymer containing a conjugated diene compound-derived unit by at least 40 mol %; (B) a conjugated diene-based polymer; and (C) a non-conjugated diene compound/non-conjugated olefin copolymer containing an ethylene-propylene-diene rubber.
    Type: Application
    Filed: February 27, 2012
    Publication date: December 5, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Junko Matsushita, Yasuo Horikawa, Shojiro Kaita, Olivier Tardif
  • Publication number: 20130274375
    Abstract: The present invention provides a rubber composition that comprises a rubber component containing a polybutadiene and a dienic rubber or an olefinic rubber immiscible with the polybutadiene, and a filler, in which the Mooney viscosity (ML1+4/100° C.) of the polybutadiene referred to as ML(I), and the Mooney viscosity (ML1+4/100° C.) of the dienic rubber or the olefinic rubber immiscible with the polybutadiene referred to as ML(II) are in a relation of ML(I)?ML(II), a method for producing the rubber composition and a tire using the rubber composition. The rubber composition is excellent in fracture resistance and capable of attaining good workability not lowering the durability such as abrasion resistance and the like of tires, and can reduce the rolling resistance of tires.
    Type: Application
    Filed: September 30, 2011
    Publication date: October 17, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Junko Matsushita
  • Publication number: 20130211010
    Abstract: Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a block copolymer, the conjugated diene compound unit having 1,2 adduct (including 3,4 adduct) content of 5% or less or the conjugated diene compound unit having a cis-1,4 bond content of more than 92%, in which preferred examples of the conjugated diene compound include 1,3-butadiene and isopropylene, and preferred examples of the non-conjugated olefin include ethylene, propylene, and 1-butene.
    Type: Application
    Filed: July 26, 2011
    Publication date: August 15, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Patent number: 8507627
    Abstract: This invention relates to an aromatic vinyl compound-conjugated diene compound copolymer capable of giving excellent wear resistance and resistance to wet skid to a tire, and more particularly to an aromatic vinyl compound-conjugated diene compound copolymer obtained by an addition polymerization of an aromatic vinyl compound and a conjugated diene compound in the presence of a polymerization catalyst composition comprising at least one specified metallocene complex selected from the group consisting of a metallocene complex represented by the following general formula (I): (wherein M is a lanthanoid element, scandium or yttrium, and CpR is independently a non-substituted or substituted indenyl, and Ra to Rf are independently an alkyl group having a carbon number of 1-3 or a hydrogen atom, and L is a neutral Lewis base, and w is an integer of 0-3) and so on, wherein a content of cis-1,4 bond in a conjugated diene compound portion is not less than 80%.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: August 13, 2013
    Assignees: Bridgestone Corporation, Riken
    Inventors: Ryuji Nakagawa, Junko Matsushita, Yoichi Ozawa, Shojiro Kaita, Olivier Tardif
  • Publication number: 20130197179
    Abstract: Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a random copolymer including randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, in which the non-conjugated olefin is preferably an acyclic olefin, the non-conjugated olefin preferably has 2 to 10 carbon atoms, and specific examples of the non-conjugated olefin preferably include ethylene, propylene, and 1-butene.
    Type: Application
    Filed: July 26, 2011
    Publication date: August 1, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Publication number: 20130184402
    Abstract: Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a tapered copolymer including: at least one of a block sequence including monomer units of the conjugated diene compound and a block sequence including monomer units of the non-conjugated olefin; and a random sequence including randomly arranged monomer units of the conjugated diene compound and monomer units of the non-conjugated olefin.
    Type: Application
    Filed: July 26, 2011
    Publication date: July 18, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Horikawa, Shojiro Kaita, Olivier Tardif, Junko Matsushita
  • Patent number: 8309657
    Abstract: An object of the present invention is to provide a rubber composition which not only realizes sufficiently low heat generation properties but also exhibits more excellent crack growth resistance than the conventional rubber composition. The rubber composition contains in 100 mass % of rubber components thereof: 20-80 mass % of natural rubber in which the total nitrogen content in natural rubber latex is in the range of 0.1 mass % to 0.4 mass % (exclusive of 0.1 mass % and inclusive of 0.4 mass %); and butadiene-based polymer having cis content of 90% or higher.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: November 13, 2012
    Assignee: Bridgestone Corporation
    Inventors: Junko Matsushita, Yoichi Ozawa
  • Patent number: 8258332
    Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer, and reacting the reactive polymer with a halosilane compound containing an amino group.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: September 4, 2012
    Assignee: Bridgestone Corporation
    Inventors: Terrence E. Hogan, Steven Luo, Yoichi Ozawa, Junko Matsushita, Ryuji Nakagawa, Eiju Suzuki, Ken Tanaka
  • Patent number: 8232352
    Abstract: There are provided a rubber composition simultaneously improving low loss factor and wear resistance as compared with the conventional ones as well as a tire using such a rubber composition. The invention lies in a rubber composition using a modified conjugated diene rubber and being excellent in the low loss factor and wear resistance as well as a tire. The rubber composition of the invention is formed by compounding a filler to a rubber component containing (A) a modified conjugated diene rubber having a cis-bond content in conjugated diene portion of not less than 87% and a vinyl bond content of not more than 2% and containing a functional group reactive with a filler and (B) a modified polymer having a modifying functional group number per 1 molecule of an unmodified polymer of not less than 0.6.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: July 31, 2012
    Assignee: Bridgestone Corporation
    Inventors: Junko Matsushita, Yoichi Ozawa, Ryuji Nakagawa
  • Publication number: 20110216291
    Abstract: The projection type image display apparatus is equipped with a lamp unit (22), an optical block (21) which modulates light from the lamp unit and projects an image signal, a circuit board (24) having via holes and on which an external connector (25) is mounted, and a cabinet (2) for housing the aforementioned elements. The display apparatus is equipped with a back cover (26) provided to cover around the external connector from the outside and a dustproof cover (29) provided to cover around the external connector from the inside. A closed space is formed by the circuit board, the back cover (26) and the dustproof cover (29), and the dustproof cover closely shields at least a space below the circuit board from the exterior. Excellent dustproof characteristics enabling use even in installation environments with a large amount of dust and dirt can be obtained.
    Type: Application
    Filed: November 30, 2009
    Publication date: September 8, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Junko Matsushita, Shunsuke Okamoto, Takanobu Taniyama, Masanori Goto, Tomohiro Murota
  • Publication number: 20110196086
    Abstract: An object of the present invention is to provide a rubber composition which not only realizes sufficiently low heat generation properties but also exhibits more excellent crack growth resistance than the conventional rubber composition. The rubber composition contains in 100 mass % of rubber components thereof: 20-80 mass % of natural rubber in which the total nitrogen content in natural rubber latex is in the range of 0.1 mass % to 0.4 mass % (exclusive of 0.1 mass % and inclusive of 0.4 mass %); and butadiene-based polymer having cis content of 90% or higher.
    Type: Application
    Filed: October 7, 2009
    Publication date: August 11, 2011
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Junko Matsushita, Yoichi Ozawa