Patents by Inventor Stephen Y. Chen
Stephen Y. 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).
-
Patent number: 6586514Abstract: Oxygen-scavenging compositions comprising an oxidizable metal component, an electrolyte component and a solid, non-electrolytic, acidifying component. When blended with soft, flexible polymeric resins, these compositions exhibit good oxygen-scavenging performance with improved oxidation efficiency relative to compositions containing an oxidizable metal component, an electrolyte, and an acidifying component combined with a more rigid thermoplastic resins. Selection of a thermally stable non-electrolytic, acidifying component is important when melt compounding the compositions into polymeric resins and particularly for extrusion coating applications. The compositions can be used directly as an oxygen absorbent resin melt-fabricated into a wide variety of oxygen-scavenging packaging articles or as concentrates in combination with other thermoplastic resins.Type: GrantFiled: January 4, 2002Date of Patent: July 1, 2003Assignee: Ciba Specialty Chemicals CorporationInventors: Weilong L. Chiang, Boh C. Tsai, Stephen Y. Chen, Lakshmi N. Venkateshwaran
-
Patent number: 6558762Abstract: Multilayered plastic bottles are disclosed having oxygen scavenging capacity sufficient to maintain substantially zero or near zero (depending on product requirements) presence of oxygen in the bottle cavity for the planned shelf life of the bottled product under specified storage conditions. The bottles feature a layer comprised of oxygen scavenger copolyester and may be used for bottling beer and other products requiring nearly total absence of oxygen for the duration of the target product shelf life.Type: GrantFiled: March 28, 2002Date of Patent: May 6, 2003Assignee: BP Corporation North America Inc.Inventors: Paul J. Cahill, George E. Rotter, Stephen Y. Chen
-
Patent number: 6509436Abstract: Compositions for scavenging oxygen are disclosed. These compositions comprise condensation copolymers comprising predominantly polyester segments and an oxygen scavenging amount of polyolefin oligomer segments. The polyester segments comprise segments derived from typical bottling and packaging polyesters such as PET and PEN. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt % of polyolefin oligomer segments. The copolycondensates are capable of absorbing at least 0.4 cc of oxygen per gram of copolymer in the solid state at ambient temperatures and are typically used as layers in films, liners, cups, wraps, bottles, etc. Use of these oxygen scavenging compositions in bottles provides a clear and rigid bottle similar in appearance to unmodified polyester bottles. In a series of preferred embodiments, bottles fabricated with the oxygen scavenging copolycondensates of this invention are over 99.Type: GrantFiled: June 29, 2000Date of Patent: January 21, 2003Assignee: BP Corporation North America Inc.Inventors: Paul J. Cahill, Stephen Y. Chen
-
Publication number: 20020155236Abstract: Multilayered plastic bottles are disclosed having oxygen scavenging capacity sufficient to maintain substantially zero or near zero (depending on product requirements) presence of oxygen in the bottle cavity for the planned shelf life of the bottled product under specified storage conditions. The bottles feature a layer comprised of oxygen scavenger copolyester and may be used for bottling beer and other products requiring nearly total absence of oxygen for the duration of the target product shelf life.Type: ApplicationFiled: March 28, 2002Publication date: October 24, 2002Inventors: Paul J. Cahill, George E. Rotter, Stephen Y. Chen
-
Publication number: 20020086929Abstract: Oxygen-scavenging compositions comprising an oxidizable metal component, an electrolyte component and a solid, non-electrolytic, acidifying component. When blended with soft, flexible polymeric resins, these compositions exhibit good oxygen-scavenging performance with improved oxidation efficiency relative to compositions containing an oxidizable metal component, an electrolyte, and an acidifying component combined with a more rigid thermoplastic resins. Selection of a thermally stable non-electrolytic, acidifying component is important when melt compounding the compositions into polymeric resins and particularly for extrusion coating applications. The compositions can be used directly as an oxygen absorbent resin melt-fabricated into a wide variety of oxygen-scavenging packaging articles or as concentrates in combination with other thermoplastic resins.Type: ApplicationFiled: January 4, 2002Publication date: July 4, 2002Inventors: Weilong L. Chiang, Boh C. Tsai, Stephen Y. Chen, Lakshmi N. Venkateshwaran
-
Patent number: 6369148Abstract: Oxygen-scavenging compositions comprising an oxidizable metal component, an electrolyte component and a solid, non-electrolytic, acidifying component. When blended with soft, flexible polymeric resins, these compositions exhibit good oxygen-scavenging performance with improved oxidation efficiency relative to compositions containing an oxidizable metal component, an electrolyte, and an acidifying component combined with a more rigid thermoplastic resins. Selection of a thermally stable non-electrolytic, acidifying component is important when melt compounding the compositions into polymeric resins and particularly for extrusion coating applications. The compositions can be used directly as an oxygen absorbent resin melt-fabricated into a wide variety of oxygen-scavenging packaging articles or as concentrates in combination with other thermoplastic resins.Type: GrantFiled: March 18, 1998Date of Patent: April 9, 2002Assignee: Ciba Specialty Chemicals CorporationInventors: Weilong L. Chiang, Boh C. Tsai, Stephen Y. Chen, Lakshmi N. Venkateshwaran
-
Patent number: 6365247Abstract: Multilayered plastic bottles are disclosed having oxygen scavenging capacity sufficient to maintain substantially zero or near zero (depending on product requirements) presence of oxygen in the bottle cavity for the planned shelf life of the bottled product under specified storage conditions. The bottles feature a layer comprised of oxygen scavenger copolyester and may be used for bottling beer and other products requiring nearly total absence of oxygen for the duration of the target product shelf life.Type: GrantFiled: March 2, 1999Date of Patent: April 2, 2002Assignee: BP Corporation North America Inc.Inventors: Paul J. Cahill, Donald F. Ackerley, Roman F. Barski, Weilong Chiang Chiang, David C. Johnson, Walter M. Nyderek, George E. Rotter, Stephen Y. Chen
-
Publication number: 20010018480Abstract: Oxygen-scavenging compositions comprising an oxidizable metal component, an electrolyte component and a solid, non-electrolytic, acidifying component. When blended with soft, flexible polymeric resins, these compositions exhibit good oxygen-scavenging performance with improved oxidation efficiency relative to compositions containing an oxidizable metal component, an electrolyte, and an acidifying component combined with a more rigid thermoplastic resins. Selection of a thermally stable non-electrolytic, acidifying component is important when melt compounding the compositions into polymeric resins and particularly for extrusion coating applications. The compositions can be used directly as an oxygen absorbent resin melt-fabricated into a wide variety of oxygen-scavenging packaging articles or as concentrates in combination with other thermoplastic resins.Type: ApplicationFiled: March 18, 1998Publication date: August 30, 2001Inventors: WEILONG L. CHIANG, BOH C. TSAI, STEPHEN Y. CHEN, LAKSHMI N. VENKATESHWARAN
-
Patent number: 6083585Abstract: Compositions for scavenging oxygen are disclosed. These compositions comprise condensation copolymers comprising predominantly polyester segments and an oxygen scavenging amount of polyolefin oligomer segments. The polyester segments comprise segments derived from typical bottling and packaging polyesters such as PET and PEN. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt % of polyolefin oligomer segments. The copolycondensates are capable of absorbing at least 0.4 cc of oxygen per gram of copolymer in the solid state at ambient temperatures and are typically used as layers in films, liners, cups, wraps, bottles, etc. Use of these oxygen scavenging compositions in bottles provides a clear and rigid bottle similar in appearance to unmodified polyester bottles. In a series of preferred embodiments, bottles fabricated with the oxygen scavenging copolycondensates of this invention are over 99.Type: GrantFiled: September 23, 1996Date of Patent: July 4, 2000Assignee: BP Amoco CorporationInventors: Paul J. Cahill, Stephen Y. Chen
-
Patent number: 5556926Abstract: Concentrates produced by melt processing a branching agent and a polyester carrier are disclosed. The concentrates are useful in melt processing polyesters. The concentrates contain sufficiently high concentrations of a branching agent to minimize the formation of crosslinked compounds in the concentrates. Process for using the concentrate also are disclosed.Type: GrantFiled: January 30, 1996Date of Patent: September 17, 1996Assignee: Amoco CorporationInventors: George E. Rotter, Weilong Chiang, Boh C. Tsai, John L. Melquist, Cheryl A. Pauer, Stephen Y. Chen
-
Patent number: 5536793Abstract: Concentrates produced by melt processing a branching agent and a polyester carrier are disclosed. The concentrates are useful in melt processing polyesters. The concentrates contain sufficiently high concentrations of a branching agent to minimize the formation of crosslinked compounds in the concentrates. Process for using the concentrate also are disclosed.Type: GrantFiled: June 7, 1995Date of Patent: July 16, 1996Assignee: Amoco CorporationInventors: George E. Rotter, Weilong Chiang, Boh C. Tsai, John L. Melquist, Cheryl A. Pauer, Stephen Y. Chen
-
Patent number: 4175071Abstract: Titanium dioxide, incorporated into vinyl polymers which contain halogenated organic compounds, screens ultraviolet radiation and thus reduces halogen discoloration.Type: GrantFiled: July 7, 1978Date of Patent: November 20, 1979Assignee: Standard Oil CompanyInventors: Stephen Y. Chen, Thomas M. Quinn