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).
-
Patent number: 11370205Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: GrantFiled: December 23, 2019Date of Patent: June 28, 2022Assignee: Toray Plastics (America), Inc.Inventors: Shichen Dou, Keunsuk P. Chang
-
Patent number: 11370204Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: GrantFiled: March 29, 2018Date of Patent: June 28, 2022Assignee: Toray Plastics (America), Inc.Inventors: Shichen Dou, Keunsuk P. Chang
-
Patent number: 11338561Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: GrantFiled: March 13, 2020Date of Patent: May 24, 2022Assignee: Toray Plastics (America), Inc.Inventors: Shichen Dou, Keunsuk P. Chang
-
Patent number: 11198279Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: GrantFiled: March 29, 2018Date of Patent: December 14, 2021Assignee: Toray Plastics (America), Inc.Inventors: Shichen Dou, Keunsuk P. Chang
-
Patent number: 11027523Abstract: Embodiments herein relates to a Bisphenol A-free multi-layer biaxially oriented polyester (BOPET) film, for lamination on metal sheets, which could be used for food containers. The BOPET film has at least one outer release layer, which aids in the release of food, such as a high protein food source, when food is cooked and sterilized in direct contact with the outer release layer. The BOPET film can be laminated to metals used in the manufacture of food containers with the outer release layer being exposed to allow a direct food contact between the surface of the outer release layer and food. More particularly, the invention relates to a novel outer release layer resin composition comprising an ultra high molecular weight siloxane polymer and a polyethylene trephthalate resin; and an alkali-metal phosphate and a phosphoric acid compound added, during polymerization of the outer release layer resin composition, as a catalyst/additive package to the ingredients forming the outer release layer resin composition.Type: GrantFiled: July 28, 2017Date of Patent: June 8, 2021Assignee: TORAY PLASTICS (AMERICA), INC.Inventors: Jan Moritz, Pat Andrews, Keunsuk P. Chang, Christopher Nothnagle, Stefanos Sakellarides
-
Publication number: 20200215803Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: ApplicationFiled: March 13, 2020Publication date: July 9, 2020Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Publication number: 20200122443Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: ApplicationFiled: December 23, 2019Publication date: April 23, 2020Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Publication number: 20200070484Abstract: A multi-layer biaxially oriented polypropylene film (BOPP) can include a core layer; an outer functional layer with the functionalities of heat-sealing, winding, printing, or receiving coatings or metallization; and an outer heat-sealable layer with partially crosslinked polydialkylsiloxane to provide excellent slipperiness and machinability. The partially crosslinked polydialkylsiloxane is not detrimental to the metal adhesion and printability of the functional layer; and maintains excellent heat-seal properties, low and consistent COF, and low and consistent hot slip properties.Type: ApplicationFiled: August 31, 2018Publication date: March 5, 2020Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Patent number: 10543667Abstract: Composite film structures for packaging use. The composite film structures have easy open, clean peel and hermetic seal characteristics stemming from good caulkability characteristics when a region of the composite film structures are folded over and sealed to form a seal on a bag, pouch or package. The composite film structure includes a base film which includes a biaxially-oriented film and a vacuum-deposited metal layer and a heat-sealant structure comprising a low density polyethylene and a linear low density polyethylene. The metal layer is between the biaxially-oriented film and the heat-sealant structure. The heat-sealant structure thickness is from about 50 to about 100 gauge, the adhesion strength between the biaxially-oriented film and the metal layer is less than about 800 g/in, and the seal strength when a region of the composite film structure is folded onto a composite film structure region is from about 500 to about 1500 g/in.Type: GrantFiled: December 30, 2016Date of Patent: January 28, 2020Assignee: Toray Plastics (America), Inc.Inventors: Adam Hanks, Joshua R. Cloutier, Keunsuk P. Chang
-
Publication number: 20190299580Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: ApplicationFiled: March 29, 2018Publication date: October 3, 2019Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Publication number: 20190299578Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: ApplicationFiled: March 29, 2018Publication date: October 3, 2019Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Publication number: 20190299579Abstract: The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.Type: ApplicationFiled: March 29, 2018Publication date: October 3, 2019Applicant: Toray Plastics (America), Inc.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Patent number: 10357913Abstract: Described are transparent oriented polypropylene films with improved barrier properties and methods of making these films. The films and methods include a core layer comprising polypropylene, hydrocarbon resin, and polyethylene wax to improve moisture vapor barrier properties, an optional barrier layer comprising polar polymers to improve oxygen barrier properties, and optional skin layers to improve heat sealing, winding, printing, and/or adhesion.Type: GrantFiled: January 29, 2018Date of Patent: July 23, 2019Assignee: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen Dou, Tracy A. Paolilli, Keunsuk P. Chang
-
Patent number: 10137625Abstract: A laminate film including at least one bio-based polyester layer. The polyester layer has a radiocarbon (14C) content of at least 21.5 pMC. The laminate film may further have additional layers such as a second bio-based polyester resin-containing layer of at least about 21.5 pMC radiocarbon content, a metal layer, or combinations thereof.Type: GrantFiled: July 8, 2011Date of Patent: November 27, 2018Assignee: TORAY PLASTICS (AMERICA), INC.Inventors: Stefanos L. Sakellarides, Keunsuk P. Chang
-
Publication number: 20180186136Abstract: Composite film structures for packaging use. The composite film structures have easy open, clean peel and hermetic seal characteristics stemming from good caulkability characteristics when a region of the composite film structures are folded over and sealed to form a seal on a bag, pouch or package. The composite film structure includes a base film which includes a biaxially-oriented film and a vacuum-deposited metal layer and a heat-sealant structure comprising a low density polyethylene and a linear low density polyethylene. The metal layer is between the biaxially-oriented film and the heat-sealant structure. The heat-sealant structure thickness is from about 50 to about 100 gauge, the adhesion strength between the biaxially-oriented film and the metal layer is less than about 800 g/in, and the seal strength when a region of the composite film structure is folded onto a composite film structure region is from about 500 to about 1500 g/in.Type: ApplicationFiled: December 30, 2016Publication date: July 5, 2018Inventors: Adam Hanks, Joshua R. Cloutier, Keunsuk P. Chang
-
Publication number: 20180162035Abstract: Described are transparent oriented polypropylene films with improved barrier properties and methods of making these films. The films and methods include a core layer comprising polypropylene, hydrocarbon resin, and polyethylene wax to improve moisture vapor barrier properties, an optional barrier layer comprising polar polymers to improve oxygen barrier properties, and optional skin layers to improve heat sealing, winding, printing, and/or adhesion.Type: ApplicationFiled: January 29, 2018Publication date: June 14, 2018Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen DOU, Tracy A. PAOLILLI, Keunsuk P. CHANG
-
Publication number: 20170326842Abstract: Embodiments herein relates to a Bisphenol A-free multi-layer biaxially oriented polyester (BOPET) film, for lamination on metal sheets, which could be used for food containers. The BOPET film has at least one outer release layer, which aids in the release of food, such as a high protein food source, when food is cooked and sterilized in direct contact with the outer release layer. The BOPET film can be laminated to metals used in the manufacture of food containers with the outer release layer being exposed to allow a direct food contact between the surface of the outer release layer and food. More particularly, the invention relates to a novel outer release layer resin composition comprising an ultra high molecular weight siloxane polymer and a polyethylene trephthalate resin; and an alkali-metal phosphate and a phosphoric acid compound added, during polymerization of the outer release layer resin composition, as a catalyst/additive package to the ingredients forming the outer release layer resin composition.Type: ApplicationFiled: July 28, 2017Publication date: November 16, 2017Inventors: Jan MORITZ, Pat ANDREWS, Keunsuk P. CHANG, Christopher NOTHNAGLE, Stefanos SAKELLARIDES
-
Publication number: 20170282507Abstract: Described are coextruded multi-layer biaxially oriented polyolefin barrier films with improved processability, moisture vapor barrier, and stiffness. The disclosed films comprise a cyclic olefin copolymer (COC) core layer blended with hydrogenated hydrocarbon resin and at least one outer layer having functionality for solvent resistance, heat sealing, or winding, or printing/coatings or adhesion for lamination.Type: ApplicationFiled: March 31, 2016Publication date: October 5, 2017Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen DOU, Keunsuk P. CHANG
-
Patent number: 9745455Abstract: A multi-layer biaxially oriented polypropylene (BOPP) film with a novel formulation which exhibits matte appearance is disclosed. This improved formulation comprises a blend of high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) with polypropylene (PP) used in the core layer to achieve a matte appearance low gloss PP-based film that still exhibits typical properties of BOPP films with significantly lower haze than conventional matte films. The multi-layer BOPP film has additional layers such as a second polyolefin resin-containing layer, a metal layer, or combinations thereof.Type: GrantFiled: July 31, 2013Date of Patent: August 29, 2017Assignee: TORAY PLASTICS (AMERICA), INC.Inventors: Claudio M. Paulino, Keunsuk P. Chang, Christopher D. Roy
-
Patent number: 9669607Abstract: A laminate film comprising a core layer comprising of a high crystalline propylene homopolymer blended with an amount of hydrocarbon resin; crystalline polyethylene wax; and a fluoropolymer and/or a metal oxide nanoparticle which exhibits excellent transparency and moisture vapor barrier properties. The laminate film could further have additional layers such as a second polyolefin resin-containing layer, or a heat-sealable polyolefin-containing layer, or combinations thereof.Type: GrantFiled: March 28, 2016Date of Patent: June 6, 2017Assignee: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen Dou, Keunsuk P. Chang