Patents by Inventor Taiichiro ICHIKAWA

Taiichiro ICHIKAWA 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: 11702779
    Abstract: A spunbonded non-woven fabric includes a fiber including a propylene homopolymer having a melting point of 140° C. or more, a polyethylene having a density of from 0.941 g/cm3 to 0.970 g/cm3, and at least one polymer selected from the group consisting of a polymer represented in (I) and a polymer represented in (II). In the spunbonded non-woven fabric, the fiber includes a sea-island structure, and the percentage of an island phase having a diameter of from 0.12 ?m to less than 0.63 ?m with respect to an island phase in a cross section orthogonal to the axis direction of the fiber on a number basis is 30% or more. (I) represents a random copolymer of propylene and at least one selected from ethylene or an ?-olefin having a carbon number of from 4 to 20. (II) represents a propylene homopolymer with a melting point of less than 120° C.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: July 18, 2023
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Taiichiro Ichikawa, Akio Matsubara, Koichi Shimada, Shigeyuki Motomura
  • Publication number: 20220119998
    Abstract: A nonwoven fabric layered body includes a first nonwoven fabric layer including a crimped fiber (A), which is a fiber made of a thermoplastic polymer and which has an average crimp diameter of 800 ?m or less; and a hydrophilic agent.
    Type: Application
    Filed: March 4, 2020
    Publication date: April 21, 2022
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Yusuke SEKIOKA, Shohei SAITA, Kosuke OTA, Koichi SHIMADA, Taiichiro ICHIKAWA
  • Publication number: 20220081814
    Abstract: A spunbonded non-woven fabric includes a fiber including a propylene homopolymer having a melting point of 140° C. or more, a polyethylene having a density of from 0.941 g/cm3 to 0.970 g/cm3, and at least one polymer selected from the group consisting of a polymer represented in (I) and a polymer represented in (II). In the spunbonded non-woven fabric, the fiber includes a sea-island structure, and the percentage of an island phase having a diameter of from 0.12 ?m to less than 0.63 ?m with respect to an island phase in a cross section orthogonal to the axis direction of the fiber on a number basis is 30% or more. (I) represents a random copolymer of propylene and at least one selected from ethylene or an ?-olefin having a carbon number of from 4 to 20. (II) represents a propylene homopolymer with a melting point of less than 120° C.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 17, 2022
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Taiichiro ICHIKAWA, Akio MATSUBARA, Koichi SHIMADA, Shigeyuki MOTOMURA
  • Publication number: 20200362492
    Abstract: Provided is a spunbonded nonwoven fabric, including a fiber formed of a composition containing: a propylene homopolymer having a melting point of 140° C. or higher; a polyethylene; and at least one polymer selected from the group consisting of a polymer shown in (I), and a polymer shown in (II), in which the fiber has a sea-island structure, and an average length of an island phase is from 1 ?m to 500 ?m in a cross section taken along a major axis direction of the fiber, and a method for producing thereof, and in which the polymer shown in (I) is a random copolymer of a propylene with ?-olefin having specified number of carbon atoms and the polymer shown in (II) is a propylene homopolymer having a melting point of less than 120° C. satisfying the specified properties.
    Type: Application
    Filed: January 23, 2019
    Publication date: November 19, 2020
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Taiichiro ICHIKAWA, Koichi SHIMADA, Shigeyuki MOTOMURA, Akio MATSUBARA