Patents by Inventor Syunichi Kiriyama

Syunichi Kiriyama 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).

  • Polyolefin-type nonwoven fabric and method of producing the same
    Patent number: 5068141
    Abstract: A nonwoven fabric formed of highly spinnable heat bonded continuous filaments which is strong and soft and is superior in hand. The nonwoven fabric is formed by heat-bonding filaments of linear low density polyethylene so that the number of defects is not more than 0.01/kg, the weight is 10-100 g/m.sup.2, the percentage bond area is 7-20% and the total hand value is 4-300 g. The nonwoven fabric is produced by melt-extruding the above-mentioned linear low density polyethylene to form filaments which are drawn by air guns at a high speed so that they are deposited on a moving collection belt to form a web which is then heat treated at a temperature 15.degree.-30.degree. C. lower than the melting point of the filaments. The nonwoven fabric an be formed of filaments of hollow or flat cross section. It is also possible to utilize bicomponent filaments having a sheath component made of linear low density polyethylene and a core component made of polyethylene terephthalate.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: November 26, 1991
    Assignee: Unitika Ltd.
    Inventors: Eiichi Kubo, Yoshihiro Kammuri, Koichi Nagaoka, Takeshi Kitahara, Yoshiki Miyahara, Syunichi Kiriyama, Yasunobu Mishima
  • Polyolefin-type nonwoven fabric and method of producing the same
    Patent number: 4981749
    Abstract: A nonwoven fabric formed of highly spinnable heat bonded continuous filaments which is strong and soft and is superior in hand. The nonwoven fabric is formed by heat-bonding filaments of linear low density polyethylene so that the number of defects is not more than 0.01/kg, the weight is 10-100 g/m.sup.2, the percentage bond area is 7-20% and the total hand value is 4-300 g. The nonwoven fabric is produced by melt-extruding the above-mentioned linear low density polyethylene to form filaments which are drawn by air guns at a high speed so that they are deposited on a moving collection belt to form a web which is then heat treated at a temperature 15.degree.-30.degree. l C. lower than the melting point of the filaments. The nonwoven fabric an be formed of filaments of hollow or flat cross section. It is also possible to utilize bicomponent filaments having a sheath component made of linear low density polyethylene and a core component made of polyethylene terephalate.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: January 1, 1991
    Assignee: Unitika Ltd.
    Inventors: Eiichi Kubo, Yoshihiro Kammuri, Koichi Nagaoka, Takeshi Kitahara, Yoshiki Miyahara, Syunichi Kiriyama, Yasunobu Mishima
  • Polyolefinic biconstituent fiber and nonwove fabric produced therefrom
    Patent number: 4874666
    Abstract: A biconstituent fiber having good spinnability, a binder fiber made thereof, and a nonwoven fabric produced therefrom and which has high tensile strength and comfortable soft touch are provided. The biconstituent fiber is composed of linear low-density polyethylene and crystalline polypropylene and may be hollow or flat in cross section. A binder fiber may be produced from a bicomponent structure in which the biconstituent fiber serves as a sheath component and polyethylene terephthalate as a core component.
    Type: Grant
    Filed: January 12, 1988
    Date of Patent: October 17, 1989
    Assignee: Unitika Ltd.
    Inventors: Eiichi Kubo, Koichi Nagaoka, Yoshiki Miyahara, Syunichi Kiriyama, Yasunobu Mishima