Patents by Inventor Takao Hiraoka

Takao Hiraoka 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: 9109136
    Abstract: A photopolymerizable inkjet ink including: at least one selected from the group consisting of (meth)acrylic acid esters negative for skin sensitization and (meth)acrylamides negative for skin sensitization; and at least one selected from the group consisting of vinyl ethers negative for skin sensitization, t-butyl methacrylate negative for skin sensitization, n-pentyl methacrylate negative for skin sensitization, and n-hexyl methacrylate negative for skin sensitization.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: August 18, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Patent number: 9068094
    Abstract: A photopolymerizable inkjet ink including: a photopolymerizable monomer having a Stimulation Index (SI value) of less than 3, where the Stimulation Index indicates the extent of sensitization as measured by a skin sensitization test based on Local Lymph Node Assay; and a phenol aromatic compound having two hydroxyl groups in the molecule thereof.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: June 30, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Patent number: 9051481
    Abstract: An active energy ray-curable ink which contains: polymerizable compounds containing a monofunctional polymerizable monomer a homopolymer of which has Tg of 90° C. or higher, wherein a cured product obtained by forming a coating film having an average thickness of 10 ?m on a polycarbonate substrate using the ink, and 15 seconds later, and applying active energy rays having a light quantity of 1,500 mJ/cm2 to the coating film to cure satisfies the following (1) and (2): (1) a stretchability of the cured product represented by the following equation is 2 or greater, when the cured product is stretched by a tensile tester at a tensile speed of 20 mm/min, and temperature of 180° C., and Stretchability=(length after tensile test)/(length before tensile test) (2) adhesion between the substrate and the cured product as measured by a cross-cut test in accordance with JIS K5400 is 70 or greater.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: June 9, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Mie Yoshino, Takao Hiraoka, Shizuka Kohzuki
  • Publication number: 20150130878
    Abstract: Provided is an active energy ray-curable inkjet ink containing at least photopolymerizable compounds. The photopolymerizable compounds include: at least one monofunctional monomer selected from the group consisting of a monofunctional monomer of which homopolymer has a glass transition temperature of 90° C. or higher, a monofunctional monomer having a ring structure, and a monofunctional monomer of which homopolymer has a glass transition temperature of 90° C. or higher and that has a ring structure; and urethane (meth)acrylate.
    Type: Application
    Filed: October 27, 2014
    Publication date: May 14, 2015
    Inventors: Shizuka KOHZUKI, Mie Yoshino, Takao Hiraoka
  • Publication number: 20150126636
    Abstract: To provide a photopolymerizable composition, which includes photopolymerizable monomers containing glycerol dimethacrylate, caprolactone-modified dipentaerythritol hexaacrylate, and diethylene glycol dimethacrylate, wherein an amount of the glycerol dimethacrylate in the photopolymerizable monomers is 25% by mass or greater.
    Type: Application
    Filed: May 17, 2013
    Publication date: May 7, 2015
    Inventor: Takao HIRAOKA
  • Publication number: 20150099819
    Abstract: A photopolymerizable composition contains diethylene glycol dimethacrylate, b1, b2, and b3, wherein the content of b2 is less than 2.5% by weight, the content of b3 is less than 3% by weight. b1 is 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-on, b2 is 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)benzyl]phenyl}-2-methyl-1-propane-1-on, and b3 is oligo{2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone}.
    Type: Application
    Filed: September 22, 2014
    Publication date: April 9, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventor: Takao Hiraoka
  • Publication number: 20150091986
    Abstract: An active energy ray curing type composition contains (meth)acrylic acid ester; and polyether-modified polysiloxane, wherein (meth)acrylic acid ester comprises diethylene glycol dimethacrylate and alkoxy-modified (meth)acrylic acid ester.
    Type: Application
    Filed: September 23, 2014
    Publication date: April 2, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shinya Seno, Takao Hiraoka
  • Publication number: 20150077481
    Abstract: An active energy ray-curable ink which contains: polymerizable compounds containing a monofunctional polymerizable monomer a homopolymer of which has Tg of 90° C. or higher, wherein a cured product obtained by forming a coating film having an average thickness of 10 ?m on a polycarbonate substrate using the ink, and 15 seconds later, and applying active energy rays having a light quantity of 1,500 mJ/cm2 to the coating film to cure satisfies the following (1) and (2): (1) a stretchability of the cured product represented by the following equation is 2 or greater, when the cured product is stretched by a tensile tester at a tensile speed of 20 mm/min, and temperature of 180° C., and Stretchability=(length after tensile test)/(length before tensile test) (2) adhesion between the substrate and the cured product as measured by a cross-cut test in accordance with JIS K5400 is 70 or greater.
    Type: Application
    Filed: September 2, 2014
    Publication date: March 19, 2015
    Inventors: Mie Yoshino, Takao Hiraoka, Shizuka Kohzuki
  • Publication number: 20150042731
    Abstract: A non-aqueous photopolymerizable inkjet ink, including as a photopolymerizable monomer: (a) ethylene glycol dimethacrylate; and (b) caprolactone-modified dipentaerythritol hexaacrylate or ethylene oxide-modified trimethylolpropane tri-methacrylate, or both thereof, wherein the ink includes the (a) component by 10% by mass to 95% by mass with respect to the entire photopolymerizable monomer, and the ink includes the (b) component by 5% by mass to 90% by mass with respect to the entire photopolymerizable monomer, and wherein the ink does not include a diluting solvent.
    Type: Application
    Filed: February 27, 2013
    Publication date: February 12, 2015
    Inventor: Takao Hiraoka
  • Publication number: 20150018782
    Abstract: A transdermal patch for the treatment of Alzheimer's disease includes: a backing, a rivastigmine-containing layer, a pressure-sensitive adhesive layer, and a release liner. In the transdermal patch, the rivastigmine-containing layer contains rivastigmine and an alkyl(meth)acrylate resin, the pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive containing a (meth)acrylic acid ester having a hydroxyl group, and neither the rivastigmine-containing layer nor the pressure-sensitive adhesive layer contains an anti-oxidizing agent.
    Type: Application
    Filed: September 25, 2014
    Publication date: January 15, 2015
    Inventors: Takao HIRAOKA, Shuta NAKANAMI, Toru KOGA
  • Publication number: 20150009265
    Abstract: To provide a photopolymerizable inkjet ink including: diethylene glycol dimethacrylate; caprolactone-modified dipentaerythritol hexaacrylate; and a photopolymerization initiator represented by the following general formula (1): where X1 is represented by the following general formula (1-1), and X2 is represented by the following general formula (1-2): where R1 to R4 are each independently a C1-C6 alkyl group, and R1 and R2 may be linked to form a ring, and R3 and R4 may be linked to form a ring; Z1 and Z2 is —NR5R6 or OR7; R5 and R6 are each independently a C1-C6 alkyl group, and R5 and R6 may be linked to form a ring; and R7 is a hydrogen atom, a methyl group, or a trimethylsilyl group.
    Type: Application
    Filed: June 20, 2014
    Publication date: January 8, 2015
    Inventors: Shizuka KOHZUKI, Takao HIRAOKA
  • Patent number: 8926082
    Abstract: An optically polymerizable inkjet ink including an optically polymerizable monomer having a Stimulation Index (SI) of less than 3 in a skin sensitization test as measured by Local Lymph Node Assay (LLNA), a molecule cleavage type optical polymerization initiator, a hydrogen-extracting type optical polymerization initiator, and an amine compound serving as a polymerization accelerator.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Patent number: 8926084
    Abstract: A polymerizable ink composition contains polymerizable monomers containing at least one of an acrylic acid ester compound, a methacrylic acid ester compound, an acryl amide, and a methacryl amide; and a vinyl ether compound; and one of potassium oxide and sodium oxide.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Patent number: 8926083
    Abstract: An improved polymerizable ink composition contains polymerizable monomers containing one or both of an acrylic acid ester compound and a methacrylic acid ester compound and a vinyl ether compound; an alkali component; and an aromatic secondary amine compound.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Patent number: 8919947
    Abstract: To provide a photopolymerizable inkjet ink, which contains monomer components, and a polymer or a copolymer of styrene, styrene derivative, acrylic acid ester, or acrylic acid, or any combination thereof, wherein the monomer components contain: t-butyl methacrylate, n-pentyl methacrylate, or n-hexyl methacrylate, or any combination thereof; and glycerol dimethacrylate, and wherein the photopolymerizable inkjet ink is free from a diluting solvent.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: December 30, 2014
    Assignee: Ricoh Company, Ltd.
    Inventor: Takao Hiraoka
  • Publication number: 20140338562
    Abstract: A photopolymerizable composition includes glyceryl monomethacrylate in an amount of from 25 to 100 parts by weight per 100 parts by weight of monomers.
    Type: Application
    Filed: May 2, 2014
    Publication date: November 20, 2014
    Inventor: Takao HIRAOKA
  • Publication number: 20140336298
    Abstract: A photopolymerizable composition includes diethyleneglycol dimethacrylate, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)benzyl]phenyl}-2-methyl-1-propane-1-one and 2-[2-hydroxy-4-(1-octyloxycarbonylethoxy)phenyl]-4,6-bis(4-phenyl)-4,6-bis)4-phenylphenyl-1,3,5-triazine.
    Type: Application
    Filed: April 24, 2014
    Publication date: November 13, 2014
    Inventor: Takao HIRAOKA
  • Publication number: 20140327719
    Abstract: A photopolymerizable inkjet ink including: at least one selected from the group consisting of (meth)acrylic acid esters negative for skin sensitization and (meth)acrylamides negative for skin sensitization; and at least one selected from the group consisting of vinyl ethers negative for skin sensitization, t-butyl methacrylate negative for skin sensitization, n-pentyl methacrylate negative for skin sensitization, and n-hexyl methacrylate negative for skin sensitization.
    Type: Application
    Filed: May 10, 2012
    Publication date: November 6, 2014
    Inventor: Takao Hiraoka
  • Publication number: 20140320572
    Abstract: A photopolymerizable composition includes diethyleneglycol dimethacrylate and methacrylic acid ester having a phosphoric group.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 30, 2014
    Inventor: Takao HIRAOKA
  • Patent number: 8871245
    Abstract: A transdermal patch for the treatment of Alzheimer's disease includes: a backing, a rivastigmine-containing layer, a pressure-sensitive adhesive layer, and a release liner. In the transdermal patch, the rivastigmine-containing layer contains rivastigmine and an alkyl (meth)acrylate resin, the pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive containing a (meth)acrylic acid ester having a hydroxy group, and neither the rivastigmine-containing layer nor the pressure-sensitive adhesive layer contains an anti-oxidizing agent.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: October 28, 2014
    Assignee: Nichiban Co., Ltd.
    Inventors: Takao Hiraoka, Shuta Nakanami, Toru Koga