Patents by Inventor Keunsuk P. Chang

Keunsuk P. Chang 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).

  • Publication number: 20080205800
    Abstract: A laminate film comprising a polyetheramine resin-containing layer, an adhesion-promoting tie-layer, and a core layer comprising of high crystalline propylene homopolymer and crystalline Fischer-Tropsch wax with an optional amount of hydrocarbon resin which exhibits excellent transparency and oxygen and moisture barrier properties. The laminate film could further have additional layers such as a second polyolefin resin-containing layer, or combinations thereof.
    Type: Application
    Filed: February 28, 2008
    Publication date: August 28, 2008
    Applicant: TORAY PLASTICS (AMERICA), INC.
    Inventors: Tien-Kuei Su, Keunsuk P. Chang
  • Patent number: 7163727
    Abstract: A laminate film comprising a polyetheramine resin-containing layer on a first polyolefin resin-containing layer or a first polyethylene terephthalate resin-containing layer is disclosed. The laminate film could further have additional layers such as a second polyolefin resin-containing layer, a second polyethylene terephthalate resin-containing layer, a metal layer or combinations thereof.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: January 16, 2007
    Assignee: Toray Plastics (America), Inc.
    Inventors: Tien-Kuei Su, Keunsuk P. Chang
  • Patent number: 7078463
    Abstract: A biaxially oriented polyolefin multilayer film containing: (a) a core layer containing (i) greater than about 0% by weight to about 50% by weight of an isotactic polypropylene-containing impact copolymer, (ii) about 10% by weight to 70% by weight of an alpha olefin/polypropylene copolymer-containing thermoplastic olefin and (iii) about 10% by weight to 70% by weight of an isotactic propylene homopolymer; and (b) at least one polyolefin skin layer adjacent to the core layer is disclosed.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: July 18, 2006
    Assignee: Toray Plastics (America), Inc.
    Inventors: Tien-Kuei Su, Keunsuk P. Chang
  • Patent number: 6916526
    Abstract: A laminate film comprising a polyolefin resin layer having a discharge-treated surface on one side of the polyolefin resin layer comprising at least 0.3% nitrogen functional groups on the discharge-treated surface; and a metal layer having an optical density of at least about 2.6 deposited on the discharge-treated surface of the polyolefin resin layer has a barrier durability under 9% elongation of 46.5 cc/m2/day or less oxygen transmission rate through the laminate film.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: July 12, 2005
    Assignee: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, Scott Narkevicius, Kevin S. Kitchin
  • Patent number: 6902822
    Abstract: A polypropylene film contains a non-migratory slip package of an aluminosilicate additive and a silicone oil and/or a crosslinked silicone polymer resin. This film has excellent and stable COF (coefficient of friction) properties and exhibits a marked improvement in stable slipperiness, excellent transparency, and excellent printability.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: June 7, 2005
    Assignee: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, A. Michael Nahmias
  • Patent number: 6844078
    Abstract: A coextruded multilayer film, having of at least a high crystalline propylene homopolymer resin layer of isotactic content greater than about 95%; a discharge-treated surface on one side of said polyolefin resin layer; an amount of hydrocarbon resin up to 10% by weight of the high crystalline propylene homopolymer of greater than about 95% isotactic content; and on the high crystalline propylene homopolymer resin layer side opposite said discharge-treated surface, a heat sealable layer or winding layer having an antiblock is disclosed.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: January 18, 2005
    Assignee: Toray Plastics (America) Inc.
    Inventors: Tien-Kuei Su, Keunsuk P. Chang
  • Patent number: 6790524
    Abstract: A laminate film comprising a polyolefin polymer layer having a surface treated by a flame or corona discharge treatment method and biaxially oriented at about 5.5-10.0 stretch ratio in the machine direction and about 7.0-12.0 stretch ratio in the transverse direction which imparts superior machine direction tensile properties such as Young's modulus of about 350,000 to about 400,000 psi or greater, elongation of 120% or less, and tensile strength of about 27,000 to about 30,000 psi or greater; and a metal layer having an optical density of at least about 1.8 deposited on said treated surface of said polyolefin-based resin layer.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: September 14, 2004
    Assignees: Toray Plastics (America), Inc., Bimo Italia S.p.A.
    Inventors: Keunsuk P. Chang, Michael Narkevicius, Hiroyuki Kato, Christopher D. Armstrong, Mario A. Scarati, Enrico Ballico, Angelo del Lupo
  • Publication number: 20040166337
    Abstract: A laminate film having a high crystalline propylene homopolymer resin layer of greater than about 93% isotactic content having a first surface and a second surface; a polyolefin resin layer disposed on the first surface, said polyolefin resin layer having a discharge-treated surface; a metal layer having an optical density of at least about 2.6 deposited on the discharge-treated surface of said polyolefin resin layer; and a heat sealable layer or a winding layer disposed on the second surface is disclosed.
    Type: Application
    Filed: February 20, 2003
    Publication date: August 26, 2004
    Applicant: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, Tien-Kuei Su
  • Patent number: 6764752
    Abstract: A laminate film comprising a polymer core layer; a resin layer disposed on a surface of the polymer layer; and a metal layer deposited on a surface of said resin layer; wherein the laminate film has excellent adhesion between the resin layer and the metal layer and barrier durability is disclosed.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: July 20, 2004
    Assignee: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, Mark S. Lee, Leo R. Moreau
  • Publication number: 20030148119
    Abstract: A coextruded multilayer film, having of at least a high crystalline propylene homopolymer resin layer of isotactic content greater than about 95%; a discharge-treated surface on one side of said polyolefin resin layer; an amount of hydrocarbon resin up to 10% by weight of the high crystalline propylene homopolymer of greater than about 95% isotactic content; and on the high crystalline propylene homopolymer resin layer side opposite said discharge-treated surface, a heat sealable layer or winding layer having an antiblock is disclosed.
    Type: Application
    Filed: February 4, 2003
    Publication date: August 7, 2003
    Applicant: TORAY PLASTICS (AMERICA), INC.
    Inventors: Tien-Kuei Su, Keunsuk P. Chang
  • Publication number: 20030082390
    Abstract: A laminate film capable of providing an oxygen and water vapor barrier to a perishable product is disclosed. The laminate film comprises a polyolefin resin layer comprising a discharge-treated surface, a metal layer having an optical density of at least 2.0 deposited directly on said discharge-treated surface of said polyolefin resin layer and a crosslinked acrylate coating of at least 0.1 micron thickness deposited on said metal layer.
    Type: Application
    Filed: October 16, 2002
    Publication date: May 1, 2003
    Inventor: Keunsuk P. Chang
  • Publication number: 20030032750
    Abstract: A laminate film comprising a polyolefin polymer layer having a surface treated by a flame or corona discharge treatment method and biaxially oriented at about 5.5-10.0 stretch ratio in the machine direction and about 7.0-12.0 stretch ratio in the transverse direction which imparts superior machine direction tensile properties such as Young's modulus of about 350,000 to about 400,000 psi or greater, elongation of 120% or less, and tensile strength of about 27,000 to about 30,000 psi or greater; and a metal layer having an optical density of at least about 1.8 deposited on said treated surface of said polyolefin-based resin layer.
    Type: Application
    Filed: August 2, 2001
    Publication date: February 13, 2003
    Applicant: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, Michael Narkevicius, Hiroyuki Kato, Christopher D. Armstrong, Mario A. Scarati, Enrico Ballico, Angelo del Lupo
  • Patent number: 6503611
    Abstract: A polypropylene film contains a non-migratory slip and release additive package of a synthetic or mineral wax, an aluminosilicate additive, and optionally a silicone oil and a crosslinked silicone polymer resin. This film has excellent and stable cold seal adhesive release properties and exhibits a marked improvement in stable slipperiness, excellent transparency, excellent printability, and no cold seal adhesive deadening.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: January 7, 2003
    Assignee: Toray Plastics (America), Inc.
    Inventors: Keunsuk P. Chang, A. Michael Nahmias
  • Publication number: 20020172815
    Abstract: A laminate film comprising a polymer core layer; a resin layer disposed on a surface of the polymer layer; and a metal layer deposited on a surface of said resin layer; wherein the laminate film has excellent adhesion between the resin layer and the metal layer and barrier durability is disclosed.
    Type: Application
    Filed: March 30, 2001
    Publication date: November 21, 2002
    Inventors: Keunsuk P. Chang, Mark S. Lee, Leo R. Moreau
  • Patent number: 5248535
    Abstract: A composite sheet of a film form base liner, a cured release coating laminated to at least one side of the base liner, and a skin, on the top-most portion of the base liner proximate to the release coating, comprising a polymer which is compatible with the base liner and contains pendant acid groups.
    Type: Grant
    Filed: January 29, 1992
    Date of Patent: September 28, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Keunsuk P. Chang, Pang-Chia Lu
  • Patent number: 5232756
    Abstract: A release film for label stock and the like having:(a) a cavitated layer of a thermoplastic polymer matrix material within which is located a strata of voids, positioned at least substantially within at least a substantial number of each of the voids is at least one spherical void-initiating solid particle which is phase-distinct and incompatible with the matrix material, the void space occupied by the particle being substantially less than the volume of the void, with one generally cross-sectional dimension of the particle at least approximating a corresponding cross-sectional dimension of the void; the population of the voids being such as to cause a degree of opacity of less than 70% light transmission;at least one surface of the layer free of any coating tending to mask the surface affects of cavitation; and(b) opposite to this surface, a coating of a release material of a type having a tendency to partially transfer to any contacting surface.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: August 3, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Keunsuk P. Chang, Leland W. Reid