Patents by Inventor Yunwa Cheung
Yunwa Cheung 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: 20070173613Abstract: The present invention is a free-radical carbon-FRTS-carbon crosslinkable polymeric composition. The resulting carbon-FRTS-carbon crosslinked polymer is prepared from at least one polymer which upon forming free radicals preferentially degrades or carbon-carbon crosslinks. The present invention permits suppression of the preferential reaction while permitting the polymer to be carbon-FRTS-carbon crosslinked through a free-radical trapping species. Suppressing the undesirable degradation or carbon-carbon crosslinking reaction and permitting the desirable carbon-FRTS-carbon crosslinking reaction yield a uniquely crosslinked polymer.Type: ApplicationFiled: December 24, 2004Publication date: July 26, 2007Applicant: Dow Global Technologied Inc.Inventors: Bharat Chaudhary, Yunwa Cheung, Randall Cuntala, Mohamed Esseghir, John Klier
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Publication number: 20070167578Abstract: A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.Type: ApplicationFiled: March 17, 2005Publication date: July 19, 2007Inventors: Daniel Arriola, Edmund Carnahan, Yunwa Cheung, David Devore, David Graf, Phillip Hustad, Roger Kuhlman, Colin Shan, Benjamin Poon, Gordon Roof, James Stevans, Pamela Stirn, Timothy Wenzel
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Publication number: 20070155900Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.Type: ApplicationFiled: January 12, 2007Publication date: July 5, 2007Applicant: Dow Global Technologies Inc.Inventors: Andy Chang, Stephen Hoenig, Yunwa Cheung, Daniel Moldovan, Wenbin Liang, Charles Diehl
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Publication number: 20070149626Abstract: The present invention is a crosslinkable, expandable polymeric composition comprising a free-radical crosslinkable polymer, a free-radical inducing species, a crosslinking-profile modifier, and a blowing agent. Preferably, the free-radical inducing species is a low temperature free-radical inducing species.Type: ApplicationFiled: December 24, 2004Publication date: June 28, 2007Applicant: DOW GLOBAL TECHNOLOGIES, INC.Inventors: Yunwa Cheung, Stephen Hahn, Wenbin Liang, Miguel Prieto Goubert, Shaofu Wu
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Publication number: 20070142565Abstract: The present invention is a rheology-modifiable polymeric composition. The resulting rheology-modified polymer is prepared from at least one polymer which upon forming free radicals preferentially degrades or carbon-carbon crosslinks. The present invention permits suppression of the preferential reaction while permitting the polymer to be coupled through a free-radical trapping species. Suppressing the undesirable degradation or carbon-carbon crosslinking reaction and permitting the desirable coupling reaction yield a rheology-modified polymer.Type: ApplicationFiled: December 24, 2004Publication date: June 21, 2007Applicant: DOW GLOBAL TECHNOLOGIES INC.Inventors: Bharat Chaudhary, Randall Cuntala, Mohamed Esseghir, John Klier, Yunwa Cheung
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Publication number: 20070112127Abstract: Polymer blends comprise at least one ethylene/?-olefin interpolymer and one or more oil. The oil can be an aromatic oil, napththenic oil, paraffinic oil or a combination thereof. The ethylene/?-olefin interpolymers are random block copolymers comprising at least a hard block and at least a soft block. The resulting blends can be used to make flexible molded articles.Type: ApplicationFiled: November 30, 2006Publication date: May 17, 2007Applicant: Dow Global Technologies Inc.Inventors: Mahalia Soediono, Patricia Ansems, Caroline Woelfle, Stephen Hoenig, Yunwa Cheung
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Publication number: 20070092704Abstract: The invention is an article comprising at least two layers, a low crystallinity layer and a high crystallinity layer. One or both layers is capable of being elongated so that a pre-stretched article is capable of being formed.Type: ApplicationFiled: October 25, 2006Publication date: April 26, 2007Applicant: Dow Global Technologies Inc.Inventors: Rajen Patel, Andy Chang, Hong Peng, Seema Karande, Benjamin Poon, Yunwa Cheung
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Publication number: 20070078222Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.Type: ApplicationFiled: September 20, 2006Publication date: April 5, 2007Applicant: Dow Global Technologies Inc.Inventors: Andy Chang, Stephen Hoenig, Yunwa Cheung, Daniel Moldovan, Wenbin Liang, Charles Diehl
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Publication number: 20070066756Abstract: Disclosed herein are polymer blends comprising at least one ethylene/?-olefin interpolymer and two different polyolefins which can be homopolymers. The ethylene/?-olefin interpolymers are block copolymers comprising at least a hard block and at least a soft block. In some embodiments, the ethylene/?-olefin interpolymer can function as a compatibilizer between the two polyolefins which may not be otherwise compatible. Methods of making the polymer blends and molded articles made from the polymer blends are also described.Type: ApplicationFiled: September 6, 2006Publication date: March 22, 2007Applicant: Dow Global Technologies Inc.Inventors: Benjamin Poon, Hongyu Chen, Yunwa Cheung
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Publication number: 20070010616Abstract: Compositions having good impact performance can be made from a thermoplastic (e.g., a polyolefin such as polypropylene or HDPE) and an ethylene multi-block copolymer. The compositions are easily molded and often have particular utility in making, for example, automotive facia, parts and other household articles.Type: ApplicationFiled: March 15, 2006Publication date: January 11, 2007Applicant: Dow Global Technologies Inc.Inventors: Mridula Kapur, Mehmet Demirors, Shaofu Wu, Yunwa Cheung, Pradeep Jain, David Fuchs
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Publication number: 20060211819Abstract: Polymer blends comprises 1) at least one ethylene/?-olefin interpolymer and 2) at least one polyolefin, or at least one styrenic block copolymer, or a combination thereof. Such polyolefins include, but are not limited to, high melt strength high density polyethylene and high melt strength polypropylene. The ethylene/?-olefin interpolymers are random block copolymers comprising at least a hard block and at least a soft block. The polyolefins can be homopolymers or interpolymers. The resulting polymer blends can be used to make flexible molded articles.Type: ApplicationFiled: March 15, 2006Publication date: September 21, 2006Applicant: Dow Global Technologies Inc.Inventors: Stephen Hoenig, Yunwa Cheung, Daniel Moldovan, Wenbin Liang, Chuiwah Cheung, Ray Lewis, John Newton
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Publication number: 20060205833Abstract: Foamable compositions and soft foams comprise at least an ethylene/?-olefin interpolymer. The soft foam has a density from about 10 to 150 kg/m3. The foamable compositions further comprise a blowing agent. The ethylene/?-olefin interpolymers are a multi-block copolymer comprising at least one soft block and at least one hard block. Methods of making the foamable compositions and soft foams; and foam articles made from the soft foams are also described.Type: ApplicationFiled: March 15, 2006Publication date: September 14, 2006Applicant: Dow Global Technologies Inc.Inventors: Felipe Martinez, Yunwa Cheung, Suresh Subramonian, Bridgette Gomillion-Williams
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Publication number: 20060199006Abstract: A fiber is obtainable from or comprises a propylene/?-olefin interpolymer characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle and a density, d, in grams/cubic centimeter, wherein the elastic recovery and the density satisfy the following relationship: Re>1481-1629(d). Such interpolymer can also be characterized by other properties. The fibers made therefrom have a relatively high elastic recovery and a relatively low coefficient of friction. The fibers can be cross-linked, if desired. Woven or non-woven fabrics can be made from such fibers.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Benjamin Poon, Yunwa Cheung, Shih-Yaw Lai, Ashish Sen, Hongyu Chen, Yuen-Yuen Chiu, Rajen Patel, Andy Chang, Antonios Doufas, Hong Peng
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Publication number: 20060199887Abstract: A filled polymer composition comprises (i) an ethylene/?-olefin interpolymer, and (ii) a filler. The ethylene/?-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block interpolymer has a number of unique characteristics disclosed here. The filled polymer compositions provided herein, in certain embodiments, have relatively higher heat resistance and improved noise, vibration and harshness properties and can be used in automotive floorings, roofings, wire and cable coating applications.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Wenbin Liang, Yunwa Cheung, Charles Diehl, Kyle Kummer
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Publication number: 20060199931Abstract: A fiber is obtainable from or comprises an ethylene/?-olefin interpolymer characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle and a density, d, in grams/cubic centimeter, wherein the elastic recovery and the density satisfy the following relationship: Re>1481?1629(d). Such interpolymer can also be characterized by other properties. The fibers made therefrom have a relatively high elastic recovery and a relatively low coefficient of friction. The fibers can be cross-linked, if desired. Woven or non-woven fabrics can be made from such fibers.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Benjamin Poon, Yunwa Cheung, Shih-Yaw Lai, Ashish Sen, Hongyu Chen, Yuen-Yuen Chiu, Rajen Patel, Andy Chang, Antonios Doufas, Hong Peng
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Publication number: 20060199872Abstract: Foamable compositions and foams comprise at least an ethylene/?-olefin interpolymer. The foam has a density from greater than 150 to about 500 kg/m3. The foamable compositions further comprise a blowing agent and a crosslinking agent. The ethylene/?-olefin interpolymers are a multi-block copolymer comprising at least one soft block and at least one hard block. Methods of making the foamable compositions and foams; and foamed articles made from the foams are also described.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Miguel Prieto, Roger Kocher, Julien Damen, Yunwa Cheung
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Publication number: 20060199912Abstract: Compositions suitable for film comprise at least one ethylene/?-olefin interpolymer, wherein the ethylene/?-olefin interpolymer may have, for example, a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship: Tm>?2002.9+4538.5(d)?2422.2(d)2.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: David Fuchs, Pradeep Jain, Mehmet Demirors, Pak-Meng Cham, Yunwa Cheung
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Publication number: 20060199884Abstract: Anti-blocking polymer compositions comprise at least one ethylene/?-olefin interpolymer and at least one anti-blocking agent comprising an amide. The ethylene/?-olefin interpolymers are a multi-block copolymer comprising at least one soft block and at least one hard block. The anti-blocking agent can be erucamide or other amides. The anti-blocking polymer composition has a pellet blocking strength of equal to or less than 100 lbs/ft2 (4800 Pa). When the anti-blocking polymer composition is made into a film, the film has a blocking force of less than about 100 grams, measured according to ASTM method D-3354.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Stephen Hoenig, Yunwa Cheung, Daniel Moldovan
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Publication number: 20060199897Abstract: An adhesive composition comprises: (i) at least one ethylene/?-olefin interpolymer, (ii) at least one tackifier; and (iii) optionally at least one additive, such as a plasticizer, wax and antioxidant. Preferably, the ethylene/?-olefin interpolymer has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship: Tm?858.91?1825.3(d)+1112.8(d)2. The composition has relatively higher SAFT temperature and can be used in hot melt adhesives pressure-sensitive adhesives, and thermoplastic marking paints.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Teresa Karjala, Selim Yalvac, Charles Diehl, Yunwa Cheung, Cynthia Rickey
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Publication number: 20060199907Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines due to improved resistance to draw resonance. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.Type: ApplicationFiled: March 15, 2006Publication date: September 7, 2006Applicant: Dow Global Technologies Inc.Inventors: Andy Chang, Ronald Weeks, Hong Peng, Antonios Doufas, Yunwa Cheung