Patents by Inventor Shaw-Chang Chu
Shaw-Chang Chu 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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Patent number: 6599622Abstract: A thermoplastic film having a substantially continuous, adherent coating on at least one surface, wherein the coating includes a polymeric binder and nano-scale particles. When the coating is formed on the surface of the film, the nano-scale particles form a barrier that substantially reduces the diffusion of moisture and oxygen. In preferred embodiments, the coating includes a polymeric binder and silicate particles formed on a base substrate layer that includes a polyolefin selected from the group consisting of homopolymers, copolymers, and terpolymers of propylene, ethylene, butylene, and blends thereof.Type: GrantFiled: October 3, 2000Date of Patent: July 29, 2003Assignee: ExxonMobil Oil CorporationInventors: Shaw-Chang Chu, Jay Kin Keung, Tien-Keui Su
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Patent number: 6534153Abstract: The present invention relates to a matte surface film comprising: a base layer comprising a polyolefin; and a matte surface layer comprising a blend of high molecular weight high density polyethylene (HMWHD PE) with at least one incompatible polyolefin. The incompatible polyolefin may be ethylene propylene (EP) copolymers, ethylene butylene propylene (EBP) terpolymers or polypropylene (PP) homopolymers, such as metallocene catalyzed isotactic polypropylene (m-iPP) or metallocene catalyzed syndiotatic polypropylene (m-sPP). The matte surface layer may additionally contain a low molecular weight high density polyethylene or a medium molecular weight high density polyethylene. The film possesses an improved matte appearance and may be used for packaging and label applications.Type: GrantFiled: December 9, 1999Date of Patent: March 18, 2003Assignee: ExxonMobil Oil CorporationInventors: Shaw-Chang Chu, George F. Cretekos, John A. Larter, Tien-Kuei Su, John R. Wagner, Jr.
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Patent number: 6312825Abstract: A multi layer film having enhanced barrier properties with respect to oxygen and water vapor transmission as well as an excellent surface for film laminating, printing and coating processes is provided. The multi layer film includes a polyolefin core layer having a wax therein, a first surface layer including a polyolefin copolymer or terpolymer layer, and a second surface layer including a polar layer having ester functionality. Multi layer films according to the present invention are particularly useful as packaging films for food products, and are particularly well suited for subsequent laminating, printing or coating operations.Type: GrantFiled: September 21, 1998Date of Patent: November 6, 2001Assignee: ExxonMobil Oil CorporationInventors: Tien-Kuei Su, Shaw-Chang Chu, Jay K. Keung
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Patent number: 6159612Abstract: An oriented multi-layer film comprises:(a) at least one layer comprising an olefin polymer, for example, isotactic polypropylene; and(b) a barrier layer adjacent the at least one layer of (a), comprising a syndiotactic polypropylene which preferably possesses an isotacticity of less than 25%, more preferably less than 15%, in particular less than 6%, and moisture and oxygen permeability reducing amounts of wax.Type: GrantFiled: August 25, 1997Date of Patent: December 12, 2000Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Michael Thomas Heffelfinger, Jay K. Keung, Robert G. Peet
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Patent number: 5731093Abstract: A metallized film combination of an oriented polymeric substrate layer having on one surface thereof a coating of a blend of (a) a vinyl alcohol homopolymer or copolymer and (b) a vinylidene chloride copolymer, the coating blend having a metal layer thereon. The method involves coating the substrate after the substrate has been machine direction oriented and before the combination is transverse direction oriented followed by TD orientation and finally by depositing a metal layer on the blend surface.Type: GrantFiled: November 16, 1992Date of Patent: March 24, 1998Assignee: Mobil Oil CorporationInventors: Wei H. Chang, Shaw-Chang Chu, James A. Johnson, Jr.
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Patent number: 5302327Abstract: A process for producing thermoplastic film which is an antifogging, heat-sealable polypropylene film; the antifogging agent is a polyglycerol ester or a sorbitan ester of a fatty acid. The resultant film, which has good clarity, persistent antifogging characteristics, and excellent heat sealability, is useful for packaging refrigerated foods. The disclosure also provides a process for making the film in which the polypropylene-containing thermoplastic resin is extruded into a sheet with subsequent orientation of said sheet in the longitudinal direction to form a monoaxially oriented film; the film is then oriented in the transverse direction.Type: GrantFiled: May 17, 1993Date of Patent: April 12, 1994Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Kevin A. Kirk, Leland W. Reid
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Patent number: 5275886Abstract: A thermoplastic film structure comprising a base layer of a thermoplastic resin which comprises polypropylene and a coating layer of a polyvinylidene fluoride is disclosed. The film is characterized by reduced coefficient of friction, improved anti-blocking characteristics, and enhanced oxygen and water vapor barrier properties. The disclosure also provides a process for making the film in which the polypropylene-containing thermoplastic resin is extruded into a sheet, said sheet oriented in the longitudinal direction to form a monoaxially oriented film, said film coated with the polyvinylidene fluoride and said coated film oriented in the transverse direction.Type: GrantFiled: October 8, 1992Date of Patent: January 4, 1994Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Kevin A. Kirk
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Patent number: 5215817Abstract: Monoaxially oriented polypropylene is coated with a pigmented polymer dispersion which imparts good print quality, ink adhesion, and smudge resistance to the ultimate biaxially oriented film.Type: GrantFiled: November 18, 1991Date of Patent: June 1, 1993Assignee: Mobil Oil CorporationInventor: Shaw-Chang Chu
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Patent number: 5192620Abstract: A metallized film combination of an oriented polymeric substrate layer having on one surface thereof a coating of a blend of (a) a vinyl alcohol homopolymer or copolymer and (b) an ethylene-acrylic acid copolymer, the coating blend having a metal layer thereon. The method involves coating the substrate after the substrate has been machine direction oriented and before the combination is transverse direction oriented followed by TD orientation and finally by depositing a metal layer on the blend surface.Type: GrantFiled: November 8, 1991Date of Patent: March 9, 1993Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, James A. Johnson
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Patent number: 5188867Abstract: A coating for a thermoplastic film includes an acrylic copolymer, a finely divided wax in the amount of 30 to 150%, preferably 30 to 60%, by weight based on the total weight of the copolymer, a finely divided inorganic solid selected from the group consisting of silica, diatomaceous earth, calcium silicate, bentonite and finely divided clays in the amount of 5 to 25% by weight based on the total weight of the copolymer and either talc or Syloid in the amount of 0 to 1% based on the total weight of the copolymer. The coated film has a low haze, non-blocking and consistently low coefficient of friction for good machinability. The coating is applied to a surface of the film as an aqueous dispersion preferably by a gravure coater placed between the machine direction orienter and the transverse direction orienter in an extruding system for the film. This film can be laminated to another film such as glassine or a plastic film.Type: GrantFiled: March 27, 1991Date of Patent: February 23, 1993Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Kevin A. Kirk
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Patent number: 5182168Abstract: A thermoplastic film comprising a base layer of a thermoplastic resin which comprises polypropylene and a coating layer of an alkali metal salt of an alkyl sulfate is disclosed. The film is characterized by reduced COF and improved anti-blocking characteristics without the attendant problems associated with decreased clarity, adhesion and wettability common to films treated to improve their COF and anti-blocking characteristics. The disclosure also provides a process for making the film in which the polypropylene-coating thermoplastic resin is extruded into a sheet, said sheet oriented in the longitudinal direction to form a monoxially oriented film, said film coated with the alkali metal salt of an alkyl sulfate and said coated film oriented in the transverse direction.Type: GrantFiled: October 9, 1991Date of Patent: January 26, 1993Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Kevin A. Kirk
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Patent number: 5175054Abstract: A metallized film combination of an oriented polymeric substrate layer having on at least one surface thereof a coating of a blend of (a) a vinyl alcohol homopolymer or copolymer and (b) an ionic copolymer of ethylene and an ethylenically unsaturated monocarboxylic acid wherein at least 10% of the carboxylic acid groups are neutralized with an alkali metal ion; and the surface of said layer blend having a metal layer thereon and the method of coating the blend of (a) and (b) on the substrate after it is machine direction oriented, followed by transverse direction orientation and depositing a metal layer on the coating surface.Type: GrantFiled: November 8, 1991Date of Patent: December 29, 1992Assignee: Mobil Oil CorporationInventor: Shaw-Chang Chu
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Patent number: 5166242Abstract: A coating composition for application to a thermoplastic film, such as polypropylene film, the coated film and the method for coating the film are disclosed. The coating composition includes an acrylic copolymer, a slip agent and, optionally, a water dispersible wax. The acrylic copolymer can be an emulsion or a solution. The acrylic copolymer preferably includes at least 5 weight percent of a polar, functional comonomer; has an average molecular weight of at least about 10,000; and has a glass transition temperature of about 30.degree. C. to about 100.degree. C.Type: GrantFiled: September 14, 1990Date of Patent: November 24, 1992Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Hee C. Park, Robert E. Touhsaent
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Patent number: 5017430Abstract: An oriented heat sealable multilayer film structure having a polyolefin film substrate, a thermoplastic primer coating on the substrate and a heat sealable acrylic or polyvinylidene coating applied to at least one primer coated surface. The primer has a glass transition of from about 0.degree. to about 50.degree. C.Type: GrantFiled: November 25, 1988Date of Patent: May 21, 1991Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Kevin A. Kirk
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Patent number: 4981758Abstract: A coating composition for application to a thermoplastic film, such as polypropylene film, the coated film and the method for coating the film are disclosed. The coating composition includes an acrylic copolymer, a slip agent and, optionally, a water dispersible wax. The acrylic copolymer can be an emulsion or a solution. The acrylic copolymer preferably includes at least 5 weight percent of a polar, functional comonomer; has an average molecular weight of at least about 10,000; and has a glass transition temperature of about 30.degree. C. to about 100.degree. C.Type: GrantFiled: January 29, 1988Date of Patent: January 1, 1991Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Hee Chung Park, Robert E. Touhsaent
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Patent number: 4956233Abstract: A slip-coated thermoplastic film is disclosed wherein the slip coating applied is essentially an aqueous wax emulsion. The wax emulsion is preferably applied to a thermoplastic film such as polypropylene. The resultant slip-coated film has low haze, non-blocking, and consistently low coefficient of friction for good machinability.Type: GrantFiled: February 21, 1989Date of Patent: September 11, 1990Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Paul D. Heilman, Kevin A. Kirk
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Patent number: 4956241Abstract: A slip-coated thermoplastic film is disclosed wherein the slip coating applied is essentially an aqueous wax emulsion. The wax emulsion is preferably applied to a thermoplastic film such as polypropylene between the machine direction and transverse direction stretching process. The resultant slip-coated film has low haze, non-blocking, and consistently low coefficient of friction for good machinability.Type: GrantFiled: December 30, 1988Date of Patent: September 11, 1990Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Paul D. Heilman, Kevin A. Kirk
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Patent number: 4837275Abstract: The extrudability of linear polymers of ethylene such as low density copolymers of ethylene and C.sub.4 -C.sub.10 olefins (LLDPE) into thin films is improved by adding small amounts, e.g. 250 to 1000 ppm of each of a fluorocarbon polymer, e.g. polyvinylidene fluoride, and of a polyalkylsiloxane, e.g. poly(methyl-octyl-siloxane), to reduce melt fracture, head pressure and extruder power.Type: GrantFiled: January 28, 1988Date of Patent: June 6, 1989Assignee: Mobil Oil CorporationInventor: Shaw-Chang Chu
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Patent number: 4824911Abstract: Blending a minor proportion of a copolymer of vinylidene fluoride and hexafluoropropylene with a major proportion of a methacrylate polymer such as polymethylmethacrylate improves the toughness of the methacrylate polymer and gives compositions suitable for molded articles.Type: GrantFiled: August 21, 1987Date of Patent: April 25, 1989Assignee: Mobil Oil CorporationInventor: Shaw-Chang Chu
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Patent number: 4753995Abstract: The extrudability of linear polymers of ethylene such as low density copolymers of ethylene and C.sub.4 -C.sub.10 olefins (LLDPE) into thin films is improved by adding small amounts, e.g., 0.02 to 2 weight percent polyvinylidene fluoride to reduce melt fracture, head pressure and to obtain films having excellent anti-blocking characteristics.Type: GrantFiled: August 29, 1986Date of Patent: June 28, 1988Assignee: Mobil Oil CorporationInventors: Shaw-Chang Chu, Richard G. Shaw