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).
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Publication number: 20140004286Abstract: A balloon made from a laminate film including at least one bio-based polyester layer of at least about 19.0 pMC of radiocarbon (14C) content is disclosed. The laminate film could further have additional layers such as a second bio-based polyester resin-containing layer of at least about 21.5 pMC of radiocarbon (14C) content, a linear low density polyethylene bio-based resin-containing layer of at least about 94 pMC of radiocarbon (14C) content, a metal layer, or combinations thereof.Type: ApplicationFiled: June 27, 2012Publication date: January 2, 2014Applicant: Toray Plastics (America), Inc.Inventors: Stefanos L. SAKELLARIDES, Keunsuk P. Chang
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Patent number: 8574695Abstract: The present invention is directed to a multilayer film having, as its main component, a hydroxy acid polymer with improved gas barrier and optional heat sealability. The oriented film of predominately hydroxy acid polymer having controlled shrink can be produced by melting and coextruding a hydroxy acid polymer with a much thinner layer of an amorphous aromatic copolyester to form a multilayer film that is quench cooled, then biaxially stretched at a process temperature above the glass transition and below the cold crystallization temperature of the hydroxy acid polymer. A heat-setting treatment with a controlled relaxation of the film above the hydroxy acid polymer glass transition temperature and below its melt temperature may be used to control shrinkage. The films thus obtained are vacuum metallized on the aromatic copolyester surface to produce environmentally friendly packaging from predominately renewable resources having improved gas barrier properties.Type: GrantFiled: September 30, 2010Date of Patent: November 5, 2013Assignee: Toray Plastics (America), Inc.Inventors: Mark Lee, Nao Yokota, Keunsuk P. Chang
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Publication number: 20130011631Abstract: 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: ApplicationFiled: July 8, 2011Publication date: January 10, 2013Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Stefanos L. SAKELLARIDES, Keunsuk P. CHANG
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Publication number: 20120251749Abstract: A monoaxially oriented film including an ethylene-propylene impact copolymer and 3-15 wt % of a metallocene-catalyzed propylene-butene elastomer and 30-60 wt % of a crystalline propylene homopolymer which is oriented at least 3 times in the machine direction and exhibits excellent linear directional tear properties in the machine direction for retort pouch applications and has excellent heat seal performance both pre- and post-retorting. This film formulation and orientation is suitable for pouch applications requiring an “easy-tear” linear tear feature and excellent hermetic seal properties, particularly for retort pouches.Type: ApplicationFiled: May 30, 2012Publication date: October 4, 2012Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: MARK S. LEE, HAROLD EGON KOEHN, EMILIO COLETTA, MATTHEW H. BROWN, KEUNSUK P. CHANG
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Publication number: 20120128973Abstract: A biaxially oriented laminate film including a core layer including a blend of crystalline polylactic acid polymer and an inorganic antiblock particle which is biaxially oriented at low transverse direction orientation temperatures to impart a degree of cavitation around the particles such that a matte or opaque appearance is obtained. The laminate film may further have additional layers such as a heat sealable layer disposed on one side of the core layer including an amorphous polylactic acid resin and/or a polylactic acid resin-containing layer disposed on the side of the core layer opposite the heat sealable layer, a metal layer, or combinations thereof.Type: ApplicationFiled: January 31, 2012Publication date: May 24, 2012Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Mark S. LEE, Harold E. Koehn, Takeshi Mizumura, Keunsuk P. Chang
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Publication number: 20110274892Abstract: A laminate film including at least one bio-based polyolefin layer including at least 53 pMC of radiocarbon (14C) content is disclosed. The laminate film may include additional layers such as a second bio-based polyolefin resin-containing layer of at least 53 pMC radiocarbon content, and a metal layer.Type: ApplicationFiled: May 6, 2011Publication date: November 10, 2011Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Keunsuk P. Chang, Michael F. Brandmeier
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Publication number: 20110244186Abstract: Described are metallized biaxially oriented polylactic acid (BOPLA) films with a novel formulation that exhibits a softer feel and quieter sound, without jeopardizing film making stability. It has been found that when these films are metallized, moisture barrier properties are surprisingly improved compared to conventional metallized BOPLA films. Specifically, the moisture barrier of the films may be 2.0 g/m2/day or less at 38° C. and 90% relative humidity. The films can be used, for example, in packaging applications. The films have characteristics that are beneficial to converting processes, are economical, and maintain bio-compostability similar to typical BOPLA films.Type: ApplicationFiled: March 31, 2011Publication date: October 6, 2011Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen Dou, Mark S. Lee, Claudio M. Paulino, Nao Yokota, Keunsuk P. Chang
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Publication number: 20110244185Abstract: Described are biaxially oriented polylactic acid (BOPLA) films with a novel formulation that exhibits a softer feel and quieter sound, without jeopardizing film making stability. The films can be used, for example, in packaging applications. The films can be metallized, or combined with barrier coatings or layers, for improved gas barrier properties particularly for moisture vapor transmission barrier desired in packaging applications. The films can also be printing films for packaging applications and may be transparent or matte in appearance. The films have characteristics that are beneficial to converting processes, are economical, and maintain bio-compostability similar to typical BOPLA films.Type: ApplicationFiled: December 23, 2010Publication date: October 6, 2011Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen DOU, Mark S. Lee, Claudio M. Paulino, Nao Yokota, Keunsuk P. Chang
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Patent number: 7988894Abstract: The present invention relates to methods of manufacturing multi-layered polyolefin films that provide excellent adhesion to cold seal cohesive formulations. A surface of the film is discharge-treated. It has been found that when the discharge-treated surface has at least 0.3% nitrogen functional groups, it provides an excellent cold seal receptive surface. A biaxially oriented polypropylene film made according the invention may also have a second skin layer, opposite the first layer, which may be used for metallizing, laminating, or printing.Type: GrantFiled: October 13, 2008Date of Patent: August 2, 2011Assignee: Toray Plastics (America), Inc.Inventors: Mark S. Lee, Keunsuk P. Chang
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Publication number: 20110171489Abstract: A laminate film including a first polylactic acid layer; a second metal-receiving layer including PVOH, EVOH, or a blend thereof on a side of the first polylactic acid layer; and a metal layer deposited on a side of the metal-receiving layer opposite the polylactic acid layer. The metal-receiving layer may be coextruded with the polylactic acid first layer or may be a coating applied to one side of the polylactic acid first layer. This laminate film exhibits excellent gas and moisture barrier properties, appearance, and metal adhesion. It may also include a heat sealable or winding improving layer on the side opposite the metal receiving-layer of the first polylactic acid layer.Type: ApplicationFiled: February 18, 2011Publication date: July 14, 2011Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen Dou, Tracy A. Paolilli, John J. Fitch, Michael F. Brandmeier, Keunsuk P. Chang
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Patent number: 7951438Abstract: A metallized laminate film exhibiting improved moisture barrier property as well as maintaining a high bio-polymer content and degradability property is disclosed. The laminate film includes a first core layer of polylactic acid polymer and a second skin layer comprising a polyolefin metal receiving layer. The metal receiving layer or the core layer, or both, may be blended with an amount of polar-modified tie-resin to improve bonding. Alternatively, a discrete tie-resin layer may be interposed between the polyolefin metal receiving layer and the crystalline polylactic acid polymer core layer. The polyolefin metal receiving layer may be discharge-treated on the side opposite the core layer and metallized.Type: GrantFiled: December 10, 2008Date of Patent: May 31, 2011Assignee: Toray Plastics (America), Inc.Inventors: Mark S. Lee, Keunsuk P. Chang
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Publication number: 20110081543Abstract: The present invention is directed to a multilayer film having, as its main component, a hydroxy acid polymer with improved gas barrier and optional heat sealability. The oriented film of predominately hydroxy acid polymer having controlled shrink can be produced by melting and coextruding a hydroxy acid polymer with a much thinner layer of an amorphous aromatic copolyester to form a multilayer film that is quench cooled, then biaxially stretched at a process temperature above the glass transition and below the cold crystallization temperature of the hydroxy acid polymer. A heat-setting treatment with a controlled relaxation of the film above the hydroxy acid polymer glass transition temperature and below its melt temperature may be used to control shrinkage. The films thus obtained are vacuum metallized on the aromatic copolyester surface to produce environmentally friendly packaging from predominately renewable resources having improved gas barrier properties.Type: ApplicationFiled: September 30, 2010Publication date: April 7, 2011Applicant: Toray Plastics (America) Inc.Inventors: Mark Lee, Keunsuk P. Chang, Nao Yokota
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Publication number: 20100330382Abstract: A biaxially oriented multilayer film comprising a skin layer of polyhydroxyalkanoate, a core layer of polylactic acid polymer and a sealant layer with a metal deposited upon one surface of the skin layer of polyhydroxyalkanoate polymer. This metallized, polyhydroxyalkanoate-coextruded polylactic acid film exhibits improved moisture barrier property versus a metallized, non-polyhydroxyalkanoate-coextruded polylactic acid film.Type: ApplicationFiled: June 28, 2010Publication date: December 30, 2010Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen DOU, Keunsuk P. Chang
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Publication number: 20100323196Abstract: Multi-layer biaxially oriented polylactic acid (BOPLA) film with a novel formulation improves the heat seal initiation temperature and heat seal performance of BOPLA films while maintaining good optical clarity. The film may include a core layer including polylactic acid base polymer resin, and a heat sealable layer including amorphous polylactic acid base polymer and a modifier comprising polycaprolactone or poly(butylene-adipate-co-butylene terephthalate).Type: ApplicationFiled: June 14, 2010Publication date: December 23, 2010Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Shichen DOU, Mark S. LEE, Keunsuk P. CHANG
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Publication number: 20100247886Abstract: Metallized multi-layer biaxially oriented polylactic acid base polymer (BOPLA) films that exhibits improved barrier properties and metal adhesion. The films include a core layer including crystalline polylactic acid base polymer, a first skin layer consisting essentially of amorphous polylactic acid base polymer, and a metal layer on the first skin layer. The films may include a second skin layer consisting essentially of amorphous polylactic acid base polymer.Type: ApplicationFiled: March 25, 2010Publication date: September 30, 2010Applicants: Toray Plastics (America), Inc., Toray Industries, Inc.Inventors: Mark S. Lee, Claudio M. Paulino, Takeshi Mizumura, Keunsuk P. Chang, Nao Yokota, Jun'ichi Masuda
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Patent number: 7722794Abstract: A method for manufacturing a surface-treated laminated film is provided. The produced film should include at least a surface treated polyolefin-containing resin layer with a flame or corona treated surface and a heat sealable resin layer having a storage shear modulus of 400,000 Pa or less at 100 rad/s at 121° C., 100,000 Pa or less at 10 rad/s at 121° C., and 5000 Pa or less at 1 rad/s at 121° C. The method may involve coextruding a laminated film that includes at least a polyolefin-containing resin layer and a heat sealable resin layer. The laminated film may be simultaneously stretched in machine and traverse direction, and subsequently surface treated to produce a surface-treated laminated film.Type: GrantFiled: February 8, 2005Date of Patent: May 25, 2010Assignees: Toray Plastics (America), Inc., Bimo Italia, S.p.A.Inventors: Keunsuk P. Chang, Enrico Ballico, Carmelo DiCostanzo
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Publication number: 20100040904Abstract: A multilayer film including a first layer including a polylactic acid polymer, a second layer of a metal primer, deposited upon one surface of the first polylactic acid polymer layer, and a third metal layer deposited on the second metal primer layer. This metal-primed and metallized polylactic acid film exhibits improved moisture barrier properties versus a non-metal-primed and metallized polylactic acid film and can be used as part of a lamination structure for food packaging applications.Type: ApplicationFiled: August 17, 2009Publication date: February 18, 2010Applicant: TORAY PLASTICS (AMERICA). INC.Inventors: Joshua R. CLOUTIER, Takeshi MIZUMURA, Keunsuk P. CHANG
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Publication number: 20090311544Abstract: A biaxially oriented laminate film including a core layer including a blend of crystalline polylactic acid polymer and an inorganic antiblock particle which is biaxially oriented at low transverse direction orientation temperatures to impart a degree of cavitation around the particles such that a matte or opaque appearance is obtained. The laminate film may further have additional layers such as a heat sealable layer disposed on one side of the core layer including an amorphous polylactic acid resin and/or a polylactic acid resin-containing layer disposed on the side of the core layer opposite the heat sealable layer, a metal layer, or combinations thereof.Type: ApplicationFiled: June 11, 2009Publication date: December 17, 2009Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Mark S. LEE, Harold Egon KOEHN, Takeshi MIZUMURA, Keunsuk P. CHANG
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Publication number: 20090148713Abstract: A metallized laminate film exhibiting improved moisture barrier property as well as maintaining a high bio-polymer content and degradability property is disclosed. The laminate film includes a first core layer of polylactic acid polymer and a second skin layer comprising a polyolefin metal receiving layer. The metal receiving layer or the core layer, or both, may be blended with an amount of polar-modified tie-resin to improve bonding. Alternatively, a discrete tie-resin layer may be interposed between the polyolefin metal receiving layer and the crystalline polylactic acid polymer core layer. The polyolefin metal receiving layer may be discharge-treated on the side opposite the core layer and metallized.Type: ApplicationFiled: December 10, 2008Publication date: June 11, 2009Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Mark S. Lee, Keunsuk P. Chang
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Publication number: 20090045543Abstract: The present invention relates to methods of manufacturing multi-layered polyolefin films that provide excellent adhesion to cold seal cohesive formulations. A surface of the film is discharge-treated. It has been found that when the discharge-treated surface has at least 0.3% nitrogen functional groups, it provides an excellent cold seal receptive surface. A biaxially oriented polypropylene film made according the invention may also have a second skin layer, opposite the first layer, which may be used for metallizing, laminating, or printing.Type: ApplicationFiled: October 13, 2008Publication date: February 19, 2009Applicant: TORAY PLASTICS (AMERICA), INC.Inventors: Mark S. LEE, Keunsuk P. Chang