Patents by Inventor Homer C. Lin
Homer C. Lin 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: 6521714Abstract: Novel brominated styrenic polymers having superior properties rendering them ideally suited for current commercial requirements for use as flame retardants in thermoplastic polymers are described. These properties include such high thermal stabilities in a standard Thermal Stability Test as to dramatically reduce if not eliminate the possibility of corrosion problems due to release of hydrogen halide at elevated polymer processing temperatures. Other special properties of the novel brominated styrenic polymers include, for example, low color or staining properties, and excellent melt flow characteristics.Type: GrantFiled: March 12, 2001Date of Patent: February 18, 2003Assignee: Albemarle CorporationInventors: Charles H. Kolich, Billie B. Dadgar, Donald E. Balhoff, Meng-Sheng Ao, Homer C. Lin
-
Publication number: 20020061983Abstract: Novel brominated styrenic polymers having superior properties rendering them ideally suited for current commercial requirements for use as flame retardants in thermoplastic polymers are described. These properties include such high thermal stabilities in a standard Thermal Stability Test as to dramatically reduce if not eliminate the possibility of corrosion problems due to release of hydrogen halide at elevated polymer processing temperatures. Other special properties of the novel brominated styrenic polymers include, for example, low color or staining properties, and excellent melt flow characteristics.Type: ApplicationFiled: March 12, 2001Publication date: May 23, 2002Inventors: Charles H. Kolich, Billie B. Dadgar, Donald E. Balhoff, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6326439Abstract: This invention relates to a thermally stable brominated polystyrene having less than 100 ppm total Cl−, above about 68 wt % bromine and less than about 6,000 ppm hydrolyzable halide. The brominated polystyrene exhibits little or no polymer cross-linking or chain cleavage relative to the starting polystyrene.Type: GrantFiled: September 15, 1998Date of Patent: December 4, 2001Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6235844Abstract: These novel brominated styrenic polymers have a bromine content in the range of about 60 to about 66 wt % bromine; a total chlorine content, if any, of less than 700 ppm; a GPC weight average molecular weight in the range of about 500,000 to about 800,000; a DSC glass transition temperature of less than 175° C.; and a thermal stability in the Thermal Stability Test of 250 ppm HBr or less. Such flame retardant polymers exhibit superior performance qualities during use, especially in thermoplastics, including improved melt flow characteristics and improved thermal stability.Type: GrantFiled: October 13, 1998Date of Patent: May 22, 2001Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6235831Abstract: A polyalkylene terephthalate polymer, such as polyethylene terephthalate, polybutylene terephthalate, blends or copolymers thereof, and analogous polyester-type engineering thermoplastics, with which has been blended a flame retardant amount of brominated styrenic polymer, such as brominated polystyrene, that, prior to blending, is characterized by (a) containing less than 700 ppm Cl and having a TGA temperature for 1% weight loss of 340° C. or higher; and/or (b) having an actual Mw which is within about 20%, and preferably within about 10%, of its calculated theoretical Mw, the theoretical Mw being based upon the actual bromine content of the brominated styrenic polymer and the Mw of the styrenic polymer reactant used to produce the brominated styrenic polymer; and/or (c) being essentially free of each of the following impurities: (1) ethylene dichloride, (2) bromodichloroethane, (3) dibromochloroethane, (4) dibromodichloroethane, and (5) tribrormochloroethane.Type: GrantFiled: September 10, 1998Date of Patent: May 22, 2001Assignee: Albemarle CorporationInventors: Jon S. Reed, Susan D. Landry, Daniel A. De Schryver, Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6232408Abstract: Novel brominated styrenic polymers have an ionic bromine content of 2000 ppm or less, and one or more of the following additional characteristics: (a) a TGA temperature for 1% weight loss which is 340° C. or higher, and a chlorine content, if any, of less than about 700 ppm Cl (b) an actual Mw which is within about 20% of the calculated theoretical Mw, the theoretical Mw being based upon the actual bromine content of the brominated styrenic polymer and the Mw of the styrenic polymer reactant used to produce the brominated styrenic polymer; and (c) essentially no content of impurities selected from the group consisting of ethylene dichloride, bromodichloroethane, dibromochloroethane, dibromodichloroethane, and tribromochloroethane. Such flame retardant polymers exhibit superior performance qualities during use, especially in thermoplastics such as glass-filled polyesters and glass-filled nylons.Type: GrantFiled: September 10, 1998Date of Patent: May 15, 2001Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6232393Abstract: Flame retarded thermoplastic polymer compositions are formed by blending together a thermoplastic polymer and at least a flame retardant amount of a brominated styrenic polymer having, prior to blending, a total bromine content of at least about 50 wt % and in addition specified characteristics pertaining to such properties as (i) TGA temperature for 1% weight loss, (ii) hydrolyzable bromine content, (iii) chlorine content (if any), and/or (iv) thermal stability using a described Thermal Stability Test. Blends made with prior art brominated polystyrenes do not possess the enhanced thermal stability and reduced metal corrosiveness provided by these brominated styrenic polymers.Type: GrantFiled: September 10, 1998Date of Patent: May 15, 2001Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 6207765Abstract: This invention relates to the bromination of styrenic polymers by contacting same with a brominating agent in the presence of a bromination catalyst and, as a reaction solvent, bromochloro-methane.Type: GrantFiled: April 13, 1999Date of Patent: March 27, 2001Assignee: Albemarle CorporationInventors: Meng-Sheng Ao, Billie B. Dadgar, Charles H. Kolich, Donald E. Balhoff, Homer C. Lin, David R. Brackenridge, Thorsten W. Brockman
-
Patent number: 6133381Abstract: This invention relates to a thermally stable brominated polystyrene composition which contains alkali metal base (e.g., NaOH) in an amount less than about 1 wt % such that if the flame retardant is dissolved in bromochloromethane and the resultant solution is extracted with water, the resultant water extract exhibits a pH of at least about 9.0. A preferred composition of this type even when heated to 315.degree. C. for one hour did not undergo darkening--the color remained tan. Comparative samples not containing the base turned black under these same conditions. Especially useful compositions additionally have less than 500 ppm, and better still, less than 100 ppm total Cl, and at least about 67 wt % bromine. Processes for producing the compositions are also described.Type: GrantFiled: April 24, 1998Date of Patent: October 17, 2000Assignee: Albelmarle CorporationInventors: Jon S. Reed, Charles H. Kolich, Billie B. Dadgar, Donald E. Balhoff, Meng-Sheng Ao, Homer C. Lin, Thorsten W. Brockmann, David R. Brackenridge
-
Patent number: 5916978Abstract: This invention relates to the bromination of styrenic polymers by contacting same with a brominating agent in the presence of a bromination catalyst and, as a reaction solvent, bromochloromethane.Type: GrantFiled: March 13, 1998Date of Patent: June 29, 1999Assignee: Albemarle CorporationInventors: Meng-Sheng Ao, Billie B. Dadgar, Charles H. Kolich, Donald E. Balhoff, Homer C. Lin, David R. Brackenridge, Thorsten W. Brockmann
-
Patent number: 5852132Abstract: This invention features a process for brominating styrenic polymers, which process comprises forming a reaction mass by feeding a mixture, (i) which is substantially free of a bromination catalyst and (ii) which is formed from at least brominating agent and a styrenic polymer, to a catalytic quantity of a bromination catalyst.Type: GrantFiled: June 11, 1997Date of Patent: December 22, 1998Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 5852131Abstract: This invention features a process for brominating styrenic polymers which process comprises feeding a first stream comprising a brominating agent, a second stream comprising styrenic polymer and a third stream comprising bromination catalyst to a mixer to intimately mix such streams.Type: GrantFiled: June 11, 1997Date of Patent: December 22, 1998Assignee: Albemarle CorporationInventors: Donald E. Balhoff, Billie B. Dadgar, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 5767203Abstract: This invention relates to the bromination of styrenic polymers by contacting same with a brominating agent in the presence of a bromination catalyst and, as a reaction solvent, bromochloromethane.Type: GrantFiled: April 25, 1997Date of Patent: June 16, 1998Assignee: Albemarle CorporationInventors: Meng-Sheng Ao, Billie B. Dadgar, Charles H. Kolich, Donald E. Balhoff, Homer C. Lin, David R. Brackenridge, Thorsten W. Brockmann
-
Patent number: 5686538Abstract: This invention features a process for brominating styrenic polymers which process comprises feeding a first stream comprising a brominating agent, a second stream comprising styrenic polymer and a third stream comprising bromination catalyst to a mixer to intimately mix such streams.Type: GrantFiled: September 26, 1996Date of Patent: November 11, 1997Assignee: Albemarle CorporationInventors: Donald E. Balhoff, Billie B. Dadgar, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
-
Patent number: 5677390Abstract: This invention features a process for brominating styrenic polymers, which process comprises forming a reaction mass by feeding a mixture, (i) which is substantially free of a bromination catalyst and (ii) which is formed from at least brominating agent and a styrenic polymer, to a catalytic quantity of a bromination catalyst.Type: GrantFiled: October 26, 1996Date of Patent: October 14, 1997Assignee: Albemarle CorporationInventors: Billie B. Dadgar, Donald E. Balhoff, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin