Patents Assigned to Unitika Ltd.
  • Publication number: 20200362144
    Abstract: The present invention provides a resin composition having high heat-resisting properties, with which a shaping can be performed in accordance with designed sizes using a fused deposition modeling method-3D printer, and from which a shaped object having a small warpage and small changes in sizes due to water can be obtained. The present invention relates to a resin composition for a shaping material of a fused deposition modeling method-3D printer, comprising cellulose fibers in a polyamide.
    Type: Application
    Filed: October 29, 2018
    Publication date: November 19, 2020
    Applicant: UNITIKA LTD.
    Inventors: Miho NAKAI, Azusa USUI, Shohei KUMAZAWA, Shota NOGUCHI, Fumio MATSUOKA, Hiroo KAMIKAWA
  • Patent number: 10836719
    Abstract: An object is to provide a method for easily producing maleimide (MI) in which trace amounts of residual acid components as impurities in a crude MI are efficiently reduced, that is, the acid value is sufficiently reduced. <1> A method for producing purified MI, comprising reducing an acid value of crude MI by 50% or more, by adding carbodiimide (CDI) to a solution comprising the crude MI to react an acid component in the crude MI with the CDI. <2> The method for producing purified MI, comprising adding 0.5% by mass or more and 8% by mass or less of the CDI with respect to a mass of the crude MI for reaction. <3> The method for producing purified MI, wherein the CDI is N,N?-diisopropyl carbodiimide (DIC). <4> The method for producing purified MI, comprising removing a urea derivative of the CDI (CDI-U) by-produced when reacting the acid component in the crude MI with the CDI.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: November 17, 2020
    Assignee: UNITIKA LTD.
    Inventors: Yuki Yamada, Tatsuya Morikita, Yosuke Sugimoto, Takeshi Yoshida, Akira Shigeta, Yoshiaki Echigo
  • Publication number: 20200354317
    Abstract: An object of the present invention is to provide a bismaleimide (D-BMI) modified product in which an amino group of dimer diamine (DDA) is maleimidized, which has the good heat resistance, and has the sufficiently enhanced processability, and a method for producing the same. There are provided: <1> A bismaleimide (D-BMI) modified product in which an amino group of dimer diamine is maleimidized, the bismaleimide modified product having the following characteristics: 1) An acid value of the D-BMI modified product is 2 mg-KOH/g or less. 2) In 1H-NMR, when quantitative comparison is performed using an integrated value (A) of a peak corresponding to a proton of a methylene group directly bound to a nitrogen atom of a maleimide group and an integrated value (B) of a peak corresponding to a vinyl proton of a maleimide group, A/B is 1.25 or more and 2.00 or less.
    Type: Application
    Filed: July 16, 2020
    Publication date: November 12, 2020
    Applicant: UNITIKA LTD.
    Inventors: Yuki YAMADA, Tatsuya MORIKITA, Takeshi YOSHIDA, Akira SHIGETA, Yoshiaki ECHIGO
  • Publication number: 20200340529
    Abstract: The present invention provides a sliding member which is superior to a conventional polyamide sliding member not only in mechanical properties (especially, flexural property) but also in sliding property. The present invention relates to a sliding member comprising unmodified cellulose fibers or cellulose fibers in which a part of hydroxyl groups from cellulose has been modified with a hydrophilic substituent, which have an average fiber diameter of 10 ?m or less, in an amount of 0.1 to 50 parts by mass with respect to 100 parts by mass of a polyamide resin.
    Type: Application
    Filed: November 14, 2018
    Publication date: October 29, 2020
    Applicant: UNITIKA LTD.
    Inventors: Shota NOGUCHI, Miho NAKAI, Shohei KUMAZAWA, Hiroo KAMIKAWA
  • Patent number: 10808342
    Abstract: Provided is a method for manufacturing a fishing net formed from a plastic net that can be handled by winding or folding although the net has plastic rigidity. The fishing net is manufactured by (1) a step of preparing a multifilament yarn formed by bundling a plurality of core-sheath type composite filaments, in each of which a core component is made of polyethylene terephthalate and a sheath component is made of polyolefin, (2) a step of preparing a yarn thread obtained by paralleling a plurality of the multifilament yarns, (3) a step of twisting or braiding four yarn threads 11, 12, 13, 14 to obtain a net constructed with strands 1 and intersections 2, (4) a step of heat-treating the net under without pressure to melt the sheath component of the yarn threads 11, 12, 13, 14 constituting the strands 1 and the intersections 2, followed by solidifying, thus obtaining a plastic net, and (5) a step of forming the fishing net using the plastic net.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: October 20, 2020
    Assignee: UNITIKA LTD.
    Inventors: Hidehito Andoh, Kohei Ikeda
  • Publication number: 20200325329
    Abstract: The present invention provides a polyarylate resin which is excellent in heat-resisting properties, abrasion-resisting properties, solubility properties in non-halogenated organic solvents, a water vapor-barrier property, mechanical properties, liquid sag-resisting properties and deformation-resisting properties (such as adhesive properties). The present invention relates to a polyarylate resin comprising a dihydric phenol residue shown in general formula (1) and an aromatic dicarboxylic acid residue shown in general formula (2), a film comprising the same and a laminated product thereof: (wherein X represents a liner or branched bivalent hydrocarbon group having 4 to 8 carbon atoms.) (wherein R1 and R2 respectively and independently represent a monovalent hydrocarbon group having 1 to 6 carbon atoms, which may be substituted by one or more halogen atoms, or a halogen atom, and p and q respectively and independently represent an integer of 0 to 4.).
    Type: Application
    Filed: May 23, 2017
    Publication date: October 15, 2020
    Applicant: UNITIKA LTD.
    Inventors: Akira MURATA, Takamasa AKIZUKI, Chiho MATSUMOTO, Keita HAGIWARA
  • Publication number: 20200317911
    Abstract: The present invention provides a resin composition excellent in a molding stability, which can be molded into a molded article excellent in a dust generation resistance, a heat resistance, a dimensional stability, and an external appearance, and a molded article obtained by molding the same. The present invention relates to a resin composition comprising a polyarylate resin, a polycarbonate resin, silica particles having an average particle diameter of 0.5 to 10 ?m and a phosphite ester compound shown by a general formula (I), wherein a mass ratio of the polyarylate resin and the polycarbonate resin is 25/75 to 90/10, a content of the silica particles is 5 to 60 parts by mass with respect to 100 parts by mass of a total amount of the polyarylate resin and the polycarbonate resin and a content of the phosphite ester compound is 0.
    Type: Application
    Filed: May 18, 2017
    Publication date: October 8, 2020
    Applicant: UNITIKA LTD.
    Inventor: Yutaka NABESHIMA
  • Publication number: 20200291247
    Abstract: The present invention provides a nickel nanowires-containing paste having an adequately high thermal curing rate even under comparatively low temperature, which is excellent in functional properties such as an electrical conductivity, strength properties (in particular, a bending property), a water-resisting property, a salt water-resisting property and electromagnetic-wave shielding properties, from which a cured structure excellent in an electrical conductivity can be obtained even if it is stored for a long time. The present invention relates to a paste comprising nickel nanowires, an alkoxy-alkylated polyamide and a glycol.
    Type: Application
    Filed: October 1, 2018
    Publication date: September 17, 2020
    Applicant: UNITIKA LTD.
    Inventors: Hirotaka TAKEDA, Chikako YAMADA
  • Patent number: 10759753
    Abstract: An object of the present invention is to provide a bismaleimide (D-BMI) modified product in which an amino group of dimer diamine (DDA) is maleimidized, which has the good heat resistance, and has the sufficiently enhanced processability, and a method for producing the same. There are provided: <1> A bismaleimide (D-BMI) modified product in which an amino group of dimer diamine is maleimidized, the bismaleimide modified product having the following characteristics: 1) An acid value of the D-BMI modified product is 2 mg-KOH/g or less. 2) In 1H-NMR, when quantitative comparison is performed using an integrated value (A) of a peak corresponding to a proton of a methylene group directly bound to a nitrogen atom of a maleimide group and an integrated value (B) of a peak corresponding to a vinyl proton of a maleimide group, A/B is 1.25 or more and 2.00 or less.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: September 1, 2020
    Assignee: UNITIKA LTD.
    Inventors: Yuki Yamada, Tatsuya Morikita, Takeshi Yoshida, Akira Shigeta, Yoshiaki Echigo
  • Patent number: 10610814
    Abstract: An air filter material has spun bond nonwoven fabric and melt blown nonwoven fabric. The spun bond nonwoven fabric includes conjugate polyester continuous filaments having a “Y4”-like cross sectional shape. The Y-4 shape of the continuous filament is composed of plural nearly V-shape portions formed from low melting point polyester, joined by a nearly + shape portion formed from high melting point polyester. The continuous filaments are heat-bonded with each other by the low melting point polyester. The spun bond nonwoven fabric is bonded with the melt blown nonwoven fabric with a powder type or spider web type hot melt adhesive agent.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: April 7, 2020
    Assignee: UNITIKA LTD.
    Inventor: Yukihiro Kihara
  • Patent number: 10584212
    Abstract: The present invention is to provide a polyamide-imide which has a high regularity of molecular structure and few branched structures, does not contain hydrogen halide, is not required to be separated and purified in post processes, and can be suitably used as a film, a varnish, or a molding material; raw material salt of polyamide-imide and production method thereof. The polyamide-imide has a repeating unit represented by the general formula (1): in which R1, R2 represent independently a divalent residue having an aromatic ring, an aliphatic ring or an aliphatic hydrocarbon; R3, R4 represent independently a trivalent residue having an aromatic ring or an aliphatic ring; and an hydrogen atom bonding to the respective rings may be replaced by another atom or an atomic group.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: March 10, 2020
    Assignee: UNITIKA LTD.
    Inventors: Yumeto Fukubayashi, Makoto Nakai, Akira Shigeta, Munenori Yamada
  • Patent number: 10522274
    Abstract: The present invention provides a ferromagnetic metal nanowire dispersion having an excellent dispersibility, from which a ferromagnetic metal nanowire film having an excellent electrical conductivity can be made. The present invention relates to a ferromagnetic metal nanowire dispersion comprising a ferromagnetic metal nanowire and a polymer compound.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: December 31, 2019
    Assignee: UNITIKA LTD.
    Inventors: Hirotaka Takeda, Hayami Onishi, Terumasa Yoshinaga
  • Publication number: 20190382341
    Abstract: An object of the present invention is to provide a bismaleimide using an aliphatic diamine, in which acid components remaining as an impurity at a very small amount in the bismaleimide have been effectively removed, that is, a bismaleimide using an aliphatic diamine, an acid value of which has sufficiently been reduced, and a method for producing it. There are provided a bismaleimide using an aliphatic diamine as a diamine component, characterized in that an acid value thereof is 2 mg-KOH/g or less, and a method for producing the bismaleimide, comprising adding carbodiimide to a solution comprising a crude bismaleimide having an acid value of more than 2 mg-KOH/g, and reacting acid components in the crude bismaleimide with carbodiimide.
    Type: Application
    Filed: August 29, 2019
    Publication date: December 19, 2019
    Applicant: UNITIKA LTD.
    Inventors: Yuki YAMADA, Tatsuya MORIKITA, Takeshi YOSHIDA, Akira SHIGETA, Yoshiaki ECHIGO
  • Patent number: 10501415
    Abstract: An object of the present invention is to provide an industrially advantageous method for producing a bisimide dicarboxylic acid, which uses substantially no solvent and requires no granulation after completion of the reaction.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: December 10, 2019
    Assignee: UNITIKA LTD.
    Inventors: Yumeto Fukubayashi, Makoto Nakai, Akira Shigeta, Munenori Yamada
  • Patent number: 10479060
    Abstract: A concealable film including 10 to 94% by mass of a crystalline polyamide resin, 1 to 40% by mass of an amorphous polyamide resin and 5 to 50% by mass of titanium oxide, with the proviso that the total content of these is 100% by mass.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: November 19, 2019
    Assignee: Unitika Ltd.
    Inventors: Atsushi Maehara, Hiroshi Nishimura, Atsushi Arahira
  • Publication number: 20190345102
    Abstract: An object is to provide a method for easily producing maleimide (MI) in which trace amounts of residual acid components as impurities in a crude MI are efficiently reduced, that is, the acid value is sufficiently reduced. <1> A method for producing purified MI, comprising reducing an acid value of crude MI by 50% or more, by adding carbodiimide (CDI) to a solution comprising the crude MI to react an acid component in the crude MI with the CDI. <2> The method for producing purified MI, comprising adding 0.5% by mass or more and 8% by mass or less of the CDI with respect to a mass of the crude MI for reaction. <3> The method for producing purified MI, wherein the CDI is N,N?-diisopropyl carbodiimide (DIC). <4> The method for producing purified MI, comprising removing a urea derivative of the CDI (CDI-U) by-produced when reacting the acid component in the crude MI with the CDI.
    Type: Application
    Filed: April 30, 2019
    Publication date: November 14, 2019
    Applicant: UNITIKA LTD.
    Inventors: Yuki Yamada, Tatsuya Morikita, Yosuke Sugimoto, Takeshi Yoshida, Akira Shigeta, Yoshiaki Echigo
  • Patent number: 10400446
    Abstract: The present invention addresses the problem of providing a transparent, noncombustible sheet having excellent transparency but minimized blurring and color bleeding. The means for addressing the problem is a transparent noncombustible sheet including a glass fiber fabric and a cured resin composition layer impregnated into the glass fiber fabric; wherein, the cured resin composition layer is formed by curing a resin composition including a curable resin and a bifunctional (meth)acrylate, total light transmittance of the transparent noncombustible sheet being no less than 80%, and haze of the transparent noncombustible sheet being no more than 30%.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: September 3, 2019
    Assignee: UNITIKA LTD.
    Inventors: Nobutaka Takeuchi, Hitoshi Kourogi, Yuki Horikoshi
  • Publication number: 20190255809
    Abstract: A mold release sheet including a resin layer provided on a semi-aromatic polyimide resin film, wherein the resin layer contains an acid-modified polyolefin resin having a proportion of an acid-modified component of 2 to 6% by mass, and a crosslinking agent.
    Type: Application
    Filed: September 27, 2017
    Publication date: August 22, 2019
    Applicant: UNITIKA LTD.
    Inventors: Masayuki Tsubota, Atsuko Noda
  • Publication number: 20190224945
    Abstract: There is provided a release film comprising a substrate film and a resin layer provided on at least one surface of a substrate film, wherein the resin layer comprises 100 parts by mass of an acid-modified polyolefin resin, 1 to 20 parts by mass of a crosslinking agent and 10 to 1,000 parts by mass of a polyvinyl alcohol having a saponification rate of 99% or lower.
    Type: Application
    Filed: September 20, 2017
    Publication date: July 25, 2019
    Applicant: UNITIKA LTD.
    Inventors: Mari Shimizu, Kouhei Tanaka, Nobuyasu Okumura
  • Publication number: 20190144329
    Abstract: A glass composition of the present disclosure includes, in wt %, 50?SiO2?54, 25?B2O3?30, 12?Al2O3?15, 0.5?MgO?1.9, 3.0?CaO?5.5, 0?ZnO?3.5, 0.1?Li2O?0.5, and 0.1?Na2O?0.3, and has a permittivity of less than 5.0 at a frequency of 1 MHz. The glass composition of the present disclosure has a low permittivity. The use of this glass composition can reduce the occurrence of devitrification and the inclusion of bubbles in glass fibers to be formed or in a shaped glass material to be formed even when the glass fibers have a small fiber diameter or the shaped glass material has a small thickness.
    Type: Application
    Filed: November 1, 2016
    Publication date: May 16, 2019
    Applicants: Nippon Sheet Glass Company, Limited, Unitika Ltd., Unitika Glass Fiber Co., Ltd.
    Inventors: Yoshiyuki INAKA, Takaharu MIYAZAKI, Yoshito NAWA, Daisuke NISHINAKA, Tomoki SEKIDA