Patents by Inventor Pak-Wing S. Chum
Pak-Wing S. Chum 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: 9219182Abstract: The fluoropolymer compositions of the present invention generally incorporate ingredients comprising one or more fluoropolymers, an ultraviolet light protection component (hereinafter UV protection component), and optionally one or more additional ingredients if desired. The UV protection component includes a combination of at least one hindered tertiary amine (HTA) compound having a certain structure and a weight average molecular weight of at least 1000. This tertiary amine is used in combination with at least one organic, UV light absorbing compound (UVLA compound) having a weight average molecular weight greater than 500. When the HTA compound and the UVLA compound are selected according to principles of the present invention, the UV protection component provides fluoropolymer compositions with significantly improved weatherability characteristics for protecting underlying materials, features, structures, components, and/or the like.Type: GrantFiled: July 3, 2012Date of Patent: December 22, 2015Assignee: Dow Global Technologies LLCInventors: Xuming Chen, Pak-Wing S. Chum, Kevin E. Howard, Leonardo C. Lopez, William C. Sumner, Shaofu Wu
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Publication number: 20140124031Abstract: The fluoropolymer compositions of the present invention generally incorporate ingredients comprising one or more fluoropolymers, an ultraviolet light protection component (hereinafter UV protection component), and optionally one or more additional ingredients if desired. The UV protection component includes a combination of at least one hindered tertiary amine (HTA) compound having a certain structure and a weight average molecular weight of at least 1000. This tertiary amine is used in combination with at least one organic, UV light absorbing compound (UVLA compound) having a weight average molecular weight greater than 500. When the HTA compound and the UVLA compound are selected according to principles of the present invention, the UV protection component provides fluoropolymer compositions with significantly improved weatherability characteristics for protecting underlying materials, features, structures, components, and/or the like.Type: ApplicationFiled: July 3, 2012Publication date: May 8, 2014Applicant: DOW GLOBAL TECHNOLOGIES LLCInventors: Xuming Chen, Pak-Wing S. Chum, Kevin E. Howard, Leonardo C. Lopez, William C. Sumner, Shaofu Wu
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Patent number: 8541077Abstract: The present invention relates to a multi-layer oriented shrink film comprising at least one skin layer comprising a polystyrene material and at least one core layer comprising a polyolefin layer. The films are preferably primarily oriented in either the machine or the cross direction. These films are ideally suited for use as a shrink label which can be applied either as a CD shrink sleeve or applied using a continuous roll process. The films ideally have an overall density of less than 1.0 g/cm3, to facilitate recycling efforts.Type: GrantFiled: November 2, 2006Date of Patent: September 24, 2013Assignee: Dow Global Technologies LLCInventors: Rajen M. Patel, Debra H. Niemann, Pak-Wing S. Chum, Moris Amon, Evgueni Rozenbaoum, Chia-Hsi Chu
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Publication number: 20100292407Abstract: Disclosed is a novel ethylene copolymer by copolymerizing an ethylene and at least one comonomer selected from a compound represented by the formula H2C?CHR wherein R is, for example, an alkyl group or an aryl group, and a diene, by slurry polymerization process in the presence of a solid catalyst system comprising a support, a transition metal compound and an activator capable of converting the transition metal compound into a catalytically active transition metal complex.Type: ApplicationFiled: March 16, 2010Publication date: November 18, 2010Applicant: Dow Global Technologies Inc.Inventors: Grant B. Jacobsen, Jozef J. Van Dun, Pak-Wing S. Chum, Larry A. Meiske, Fumio Matsushita, Akira Miyamoto
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Patent number: 7714073Abstract: The invention provides blends comprising an ethylene copolymer formed from ethylene with at least one comonomer selected from (a) the group comprising compounds represented by the formula H2C?CHR wherein R represents a C1-C20 linear, branched or cyclic alkyl group or a C6-C20 aryl group, and (b) a C4-C20 linear, branched or cyclic diene. Each copolymer has a specific density, a specific molecular weight distribution, and a specific comonomer content distribution characteristic.Type: GrantFiled: June 28, 2006Date of Patent: May 11, 2010Inventors: Grant B. Jacobsen, Jozef J. Van Dun, Pak-Wing S. Chum, Larry A. Meiske, Fumio Matsushita, Akira Miyamoto
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Patent number: 7645835Abstract: Blend compositions containing a novel homopolymer, the use of which allows the incorporation of more comonomer in the additional components of the blend (for the same overall density) resulting in increased tie molecule formation and improvement in properties such as ESCR, toughness and impact strength are disclosed. The homopolymers are important for applications where a high density is needed to ensure certain mechanical properties like abrasion resistance, indentation resistance, pressure resistance, topload resistance, modulus of elasticity, or morphology (for the chlorination of PE to CPE) and additional advantages such as melt processability. The blend can be obtained by dry or melt mixing the already produced components, or through in-situ production by in parallel and/or in series arranged reactors. These resins can be used in applications such as films, blow molded, injection molded, and rotomolded articles, fibers, and cable and wire coatings and jacketings and, various forms of pipe.Type: GrantFiled: June 21, 2006Date of Patent: January 12, 2010Assignee: Dow Global Technologies, Inc.Inventors: Jozef J. Van Dun, Akira Miyamoto, Grant B. Jacobsen, Fumio Matsushita, Patrick J. Schouterden, Lee Spencer, Pak-Wing S. Chum, Larry A. Meiske, Peter L. Wauteraerts
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Publication number: 20090220757Abstract: The present invention relates to a multi-layer oriented shrink film comprising at least one skin layer comprising a polystyrene material and at least one core layer comprising a polyolefin layer. The films are preferably primarily oriented in either the machine or the cross direction. These films are ideally suited for use as a shrink label which can be applied either as a CD shrink sleeve or applied using a continuous roll process. The films ideally have an overall density of less than 1.0 g/cm3, to facilitate recycling efforts.Type: ApplicationFiled: November 2, 2006Publication date: September 3, 2009Inventors: Rajen M. Patel, Debra H. Niemann, Pak-Wing S. Chum, Morris Amon, Evgueni Rozenbaoum, Chia-Hsi Chu
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Publication number: 20080125547Abstract: Ethylene polymer compositions comprising a high molecular weight high density polyethylene resin and a low density polyethylene resin are disclosed, where the polymer composition has a comparatively high melt strength for a given melt index. The compositions comprise from 25 to 99 percent by weight of the composition of a linear or substantially linear polyethylene polymer having a density of at least about 0.90 g/cc, and an I21 of less than about 20; and from 1 to 25 percent by weight of the composition of a high pressure low density type polyethylene resin having a melt index (I2) less than about 5, a molecular weight distribution greater than about 10, a Mw_abs/Mw_gpc ratio (“Gr”) of at least 2.7, and a melt strength at 190° C. greater than 19.0?12.6*log10(Mi). The compositions of the present invention are particularly well suited for blown film and thermoforming applications.Type: ApplicationFiled: March 3, 2006Publication date: May 29, 2008Inventors: Kurt Swogger, Pak-Wing S. Chum, Thomas Oswald, Stephane Costeux
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Patent number: 7166676Abstract: A process for the preparation of blends including an ethylene copolymer by copolymerizing ethylene and at least one comonomer selected from a compound represented by the formula H2C?CHR wherein R is an alkyl group or an aryl group, and a diene, in the presence of a solid catalyst system comprising a support, a transition metal compound and an activator capable of converting the transition metal compound into a catalytically active transition metal complex.Type: GrantFiled: June 7, 2002Date of Patent: January 23, 2007Assignee: Dow Global Technologies, Inc.Inventors: Grant B. Jacobsen, Jozef J. Van Dun, Pak-Wing S. Chum, Larry A. Meiske, Fumio Matsushita, Akira Miyamoto
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Patent number: 7153909Abstract: Blend compositions containing a novel homopolymer, the use of which allows the incorporation of more comonomer in the additional components of the blend (for the same overall density) resulting in increased tie molecule formation and improvement in properties such as ESCR, toughness and impact strength are disclosed. The homopolymers are important for applications where a high density is needed to ensure certain mechanical properties like abrasion resistance, indentation resistance, pressure resistance, topload resistance, modulus of elasticity, or morphology (for the chlorination of PE to CPE) and additional advantages such as melt processability. The blend can be obtained by dry or melt mixing the already produced components, or through in-situ production by in parallel and/or in series arranged reactors. These resins can be used in applications such as films, blow molded, injection molded, and rotomolded articles, fibres, and cable and wire coatings and jacketings and, various forms of pipe.Type: GrantFiled: June 13, 2002Date of Patent: December 26, 2006Assignee: Dow Global Technologies Inc.Inventors: Jozef J. Van Dun, Akira Miyamoto, Grant B. Jacobsen, Fumio Matsushita, Patrick J. Schouterden, Lee Spencer, Pak-Wing S. Chum, Larry A. Meiski, Peter L. Wauteraerts
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Patent number: 7041765Abstract: Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt%) propylene; and (B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative of component (B) unsatuarated comonomers are the C4-20 ?-olefins, C4-20 dienes, styrenic compounds, and the like. Preferably, the film has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss of greater than about 65, and (iii) dart value of greater than about 100 g/mil. In one preferred embodiment, the layer comprises a compolymer characterized as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e.Type: GrantFiled: November 5, 2002Date of Patent: May 9, 2006Assignee: Dow Global Technologies Inc.Inventors: Li-Min Tau, Pak-Wing S. Chum, Seema Karande, Clive Bosnyak
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Patent number: 6946182Abstract: Disclosed are mono-layer or multi-layer films, sheets, or coatings wherein at least on layer comprises a fringed surface microstructure (1), a process for making these items and uses thereof. Further disclosed are articles of manufacture comprising such film, sheet, or coating.Type: GrantFiled: July 17, 2000Date of Patent: September 20, 2005Inventors: Thomas T. Allgeuer, Selim Bensason, Pak-Wing S. Chum, Jacquelyne A. Degroot, Robert H. Kelch, Wenbin Liang, Antonio Torres, Werner Wagner
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Patent number: 6946535Abstract: Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt %) propylene; and (B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative of component (B) unsatuarated comonomers are the C4-20 ?-olefins, C4-20 dienes, styrenic compounds, and the like. Preferably, the film has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss of greater than about 65, and (iii) dart value of greater than about 100 g/mil. In one preferred embodiment, the layer comprises a compolymer characterized as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e.Type: GrantFiled: October 18, 2004Date of Patent: September 20, 2005Assignee: Dow Global Technologies Inc.Inventors: Li-Min Tau, Pak-Wing S. Chum, Seema Karande, Clive Bosnyak
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Patent number: 6939919Abstract: The present invention includes a blend composition comprising at least one coupled propylene polymer and at least 55 weight percent of at least one ethylene polymer, based on the total weight of the coupled propylene polymer and the ethylene polymer. The invention also includes methods for making the coupled propylene polymer and methods for making the blend composition. The present invention further includes films made from the blend composition.Type: GrantFiled: May 25, 2001Date of Patent: September 6, 2005Assignee: Dow Global Technologies Inc.Inventors: Li-Min Tau, William R. Van Volkenburgh, Wendy D. Hoenig, Pak-Wing S. Chum
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Patent number: 6919407Abstract: Films with excellent machine direction (MD) tear properties comprise at least one layer made from a polymer comprising: (A) at least 50 weight percent (wt %) propylene; and (B) at least 5 wt % ethylene and/or one or more unsaturated comonomers. Representative of component (B) unsatuarated comonomers are the C4-20 ?-olefins, C4-20 dienes, styrenic compounds, and the like. Preferably, the film has at least one of a (i) haze value of less than about 10, (ii) 45 degree gloss of greater than about 65, and (iii) dart value of greater than about 100 g/mil. In one preferred embodiment, the layer comprises a compolymer characterized as having at least one of the following properties: (i) 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a B-value greater than about 1.4 when the comonomer content, i.e.Type: GrantFiled: August 15, 2003Date of Patent: July 19, 2005Assignee: Dow Global Technologies Inc.Inventors: Li-Min Tau, Pak-Wing S. Chum, Seema Karande, Clive Bosnyak
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Patent number: 6906141Abstract: Polymer blends are described that include at least one first ethylene interpolymer and at least one second ethylene interpolymer wherein the difference in the number of carbon atoms in the comonomer of the first interpolymer and the comonomer of the second interpolymer is at least two, wherein the first interpolymer and/or the second interpolymer has molecular weight distribution of from about 1.8 to about 2.8; and wherein the polymer blend has a density greater than or equal to 0.90 g/cm3. Articles made from such blends are also disclosed.Type: GrantFiled: March 1, 2004Date of Patent: June 14, 2005Assignee: Dow Global Technologies Inc.Inventors: Pak-Wing S. Chum, Kurt W. Swogger, Thomas Oswald, Pradeep Jain
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Patent number: 6872438Abstract: Disclosed are mono-layer or multi-layer profiles or moldings wherein at least one layer comprises a fringed surface microstructure, a process for making these items and uses thereof. Further disclosed are articles of manufacture comprising such profile or molding.Type: GrantFiled: July 17, 2000Date of Patent: March 29, 2005Assignee: Advanced Design Concept GmbHInventors: Thomas T. Allgeuer, Selim Bensason, Pak-Wing S. Chum, Jacquelyne A. deGroot, Wenbin Liang, Antonio Torres, Werner Wagner
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Patent number: 6812289Abstract: This invention relates to cast films prepared from interpolymer compositions comprising; (A) a substantially linear ethylene/&agr;-olefin interpolymer present in the composition in an amount of from about 10 to about 100% by weight based on the combined weight of Components A and B; and (B) a heterogeneous interpolymer present in the composition in an amount of from about 0 to about 90% by weight based on the combined weight of Components A and B; and wherein said interpolymer composition has an I10/I2 value of < about 10.0 and is characterized as having a viscosity at 100 rad/s and a relaxation time (&tgr;) which satisfies either of the following relationships; Log(viscosity at 100 rad/s)≦4.43−0.8 log(I2) or log(&tgr;)>−1.2−1.3* log(I2) The interpolymer compositions are useful in cast stretch film manufacture with the resulting cast films having an excellent balance of strength and processability.Type: GrantFiled: July 22, 2002Date of Patent: November 2, 2004Assignee: Dow Global Technologies Inc.Inventors: Jozef J. I. Van Dun, Jacquelyn A. deGroot, Pradeep Jain, Kalyan Sehanobish, Pak-Wing S. Chum
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Patent number: 6803014Abstract: The present invention relates to a method for making a heat-resistant elastic article and a heat-resistant elastic article. The invention especially relates to a method of making elastic fibers and polymeric elastic fibers wherein the elastic fibers are capable of withstanding dyeing and heat-setting processes that typically are conducted at elevated temperatures (such as 110-230° C. and especially at greater than or equal to 130° C. for minutes). The inventive method comprises radiation crosslinking an article (or plurality of articles) under an inert or oxygen limited atmosphere (for example, in N2, argon, helium, carbon dioxide, xenon and/or a vacuum) wherein the article (or articles) comprises at least one amine stabilizer and preferably another optional stabilizer additive. More preferably, the radiation crosslinking is performed at a low temperature (−50 to 40° C.).Type: GrantFiled: July 10, 2002Date of Patent: October 12, 2004Assignee: Dow Global Technologies Inc.Inventors: Thoi H. Ho, Selim Bensason, Rajen M. Patel, Kimberly S. Houchens, Rona L. Reid, Pak-Wing S. Chum, Leonie K. Walsh
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Publication number: 20040167286Abstract: This invention is directed to an ethylene polymer blend comprising at least two diverse ethylene interpolymers wherein one interpolymer has a lower number of carbons than the at least one other interpolymer. The ethylene polymer blend preferably comprises at least one homogeneously branched ethylene/&agr;-olefin interpolymer blended with at least one heterogeneously branched ethylene/&agr;-olefin interpolymer and is characterized as having a density greater than or equal to 0.90 g/cm3 and in particularly preferred embodiments is further characterized as having an intrinsic tear value greater than or equal to 150 grams. The inventive ethylene polymer blend can be used to make various fabricated articles, especially extruded forms and most especially films such as high strength thin gauge packaging film, impact resistant shrink film and heat sealable packaging film.Type: ApplicationFiled: March 1, 2004Publication date: August 26, 2004Inventors: Pak-Wing S. Chum, Kurt W. Swogger, Thomas Oswald, Pradeep Jain