Patents by Inventor Michael Chia-Chao Chen
Michael Chia-Chao Chen 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: 7235618Abstract: Embodiments of the present invention include a polypropylene homopolymer synthesized from a metallocene catalyst system and methods of forming the homopolymer, the homopolymer having an aluminum and chlorine recoverables value of less than 25 ppm and a xylene solubles of less than 1 wt % relative to the total weight of the homopolymer. The resulting homopolymer has other desirable properties such as a heat deflection temperature at 0.45 MPa of from 90° C. to 110° C., and a MWD value of from 1.7 to 5.0. These properties make embodiments of the homopolymer desirable for films, and in particular for capacitor films.Type: GrantFiled: August 22, 2001Date of Patent: June 26, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Chon-Yie Lin, Bernard Louis Bossaert, Michael Chia-Chao Chen, Susan Chia-Yu Yeh
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Patent number: 7026040Abstract: This invention relates generally to films made from crystalline polypropylene polymers. Specifically, this invention relates to films comprising crystalline polypropylene polymer compositions containing both propylene homopolymers and propylene copolymers. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymers and copolymers using propylene with a small amount of comonomer, preferably ethylene. The resulting polymers are excellent for use in the production of biaxially oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional polypropylene polymers.Type: GrantFiled: August 31, 2004Date of Patent: April 11, 2006Assignee: Exxon Mobil Chemical Patents Inc.Inventors: Aspy Keki Mehta, Michael Chia-Chao Chen, Chon-Yie Lin, James John Mcalpin, Anthony Nicholas Speca, Kelly Tormaschy
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Patent number: 6806316Abstract: This invention relates generally to crystalline polypropylene polymers and methods for their production. Specifically, this invention relates to crystalline polypropylene polymer compositions comprising both propylene homopolymers and propylene copolymers. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymers and copolymers using propylene with a small amount of comonomer, preferably ethylene. The resulting polymers are excellent for use in the production of biaxially oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional polypropylene polymers.Type: GrantFiled: November 25, 2002Date of Patent: October 19, 2004Assignee: ExxonMobil Chemical Patents Inc.Inventors: Aspy Keki Mehta, Michael Chia-Chao Chen, Chon-Yie Lin, James John McAlpin, Anthony Nicholas Speca, Kelly Tormaschy
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Publication number: 20030153689Abstract: This invention relates generally to crystalline polypropylene polymers and methods for their production. Specifically, this invention relates to crystalline polypropylene polymer compositions comprising both propylene homopolymers and propylene copolymers. The compositions are prepared using metallocene catalyst systems comprising at least two metallocenes in a polymerization process that involves the sequential or parallel polymerization of propylene homopolymers and copolymers using propylene with a small amount of comonomer, preferably ethylene. The resulting polymers are excellent for use in the production of biaxially oriented films. Films prepared with these propylene polymers have a significantly broader processability range and can be evenly stretched at lower temperature compared to films prepared from traditional polypropylene polymers.Type: ApplicationFiled: November 25, 2002Publication date: August 14, 2003Inventors: Aspy Keki Mehta, Michael Chia-Chao Chen, Chon-Yie Lin, James John McAlpin, Anthony Nicholas Speca, Kelly Tormaschy
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Patent number: 6476173Abstract: This invention relates to isotactic propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from about 2.5 to about 20.0. The isototic propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.Type: GrantFiled: November 7, 2000Date of Patent: November 5, 2002Assignee: Exxon Mobil Chemical Patents Inc.Inventors: Chon-Yie Lin, Michael Chia-Chao Chen, Aspy Keki Mehta, Rajan K. Chudgar
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Publication number: 20010016639Abstract: The co-polymerization reaction of one or more olefin monomers, such as propylene, with &agr;,&ohgr;-diene units and the resulting copolymers are provided. More specifically, the copolymer may have from 90 to 99.999 weight percent of olefins and from 0.001 to 2.000 weight percent of &agr;,&ohgr;-dienes. The copolymer may have a weight average molecular weight in the range from 50,000 to 2,000,000, a crystallization temperature in the range from 115° C. to 135° C. and a melt flow rate in the range from 0.1 dg/min to 100 dg/min. These copolymers may be employed in a wide variety of applications, the articles of which include, for example, films, fibers, such as spunbonded and meltblown fibers, fabrics, such as nonwoven fabrics, and molded articles. The copolymer may further include at least two crystalline populations.Type: ApplicationFiled: December 11, 2000Publication date: August 23, 2001Inventors: Pawan Kumar Agarwal, Weiqing Weng, Aspy Keki Mehta, Armenag Hagop Dekmezian, Christopher Ross Davey, Charlie Y. Lin, Michael Chia-Chao Chen, Galen Charles Richeson
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Publication number: 20010007896Abstract: The co-polymerization reaction of one or more olefin monomers, such as propylene, with &agr;,&ohgr;-diene units and the resulting copolymers are provided. More specifically, the copolymer may have from 90 to 99.999 weight percent of olefins and from 0.001 to 2.000 weight percent of &agr;,&ohgr;)-dienes. The copolymer may have a weight average molecular weight in the range from 50,000 to 2,000,000, a crystallization temperature in the range from 115° C. to 135° C. and a melt flow rate in the range from 0.1 dg/min to 100 dg/min. These copolymers may be employed in a wide variety of applications, the articles of which include, for example, films, fibers, such as spunbonded and meltblown fibers, fabrics, such as nonwoven fabrics, and molded articles. The copolymer may further include at least two crystalline populations.Type: ApplicationFiled: December 11, 2000Publication date: July 12, 2001Inventors: Pawan Kumar Agarwal, Weiqing Weng, Aspy Keki Mehta, Armenag Hagop Dekmezian, Christopher Ross Davey, Charlie Y. Lin, Michael Chia-Chao Chen, Galen Charles Richeson, Rajan K. Chudgar, Main Chang
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Patent number: 6207750Abstract: This invention relates to isotactic propylene homopolymer compositions obtained from metallocene catalysis wherein the polymer has a molecular weight distribution (Mw/Mn) in the range of from about 2.5 to about 20.0. The isotactic propylene homopolymer composition may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.Type: GrantFiled: April 16, 1999Date of Patent: March 27, 2001Assignee: Exxon Chemical Patents, Inc.Inventors: Chon-Yie Lin, Michael Chia-Chao Chen, Aspy Keki Mehta, Rajan K. Chudgar
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Patent number: 5741563Abstract: Shrink films prepared from metallocene catalyzed propylene homopolymers and copolymers are provided. The films exhibit a unique balance of properties as compared to known shrink films including higher stiffness, tensile strength and moisture barrier, lower extractables, improved shrinkage and increased shrink tension. In addition, the shrink behavior of the film can be substantially tailored by modifying the amount of comonomer present in the propylene polymer.Type: GrantFiled: July 30, 1996Date of Patent: April 21, 1998Assignee: Exxon Chemical Patents Inc.Inventors: Aspy Keki Mehta, Michael Chia-Chao Chen