Patents by Inventor Kurt F. Wissbrun
Kurt F. Wissbrun 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: 5292589Abstract: A melt processable wholly aromatic liquid crystalline polymer capable of forming an anisotropic melt phase at a temperature below approximately 400.degree. C. having enhanced adhesion properties containing from approximately 0.05 to approximately 2.0 mole percent of a recurring sulfonated, ionic moiety in the backbone of the polymer. The polymer is useful for the production of laminate structures.Type: GrantFiled: October 30, 1992Date of Patent: March 8, 1994Assignee: Hoechst Celanese Corp.Inventors: James P. Shepherd, Gerald Farrow, Kurt F. Wissbrun
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Patent number: 5264477Abstract: In situ formation of a melt processable liquid crystalline polyester composition capable of forming an anisotropic melt phase at a temperature of below approximately 400.degree. C. having an improved heat distortion temperature under a load, the composition being formed in the presence of from approximately 0.05 to approximately 1.0 weight percent of a divalent metal salt of terephthalic acid as a nucleating agent. Films, fibers and molded articles produced from the composition exhibit improved thermal properties.Type: GrantFiled: July 28, 1992Date of Patent: November 23, 1993Assignee: Hoechst Celanese Corp.Inventors: Kurt F. Wissbrun, James P. Shepherd
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Patent number: 5227456Abstract: A melt processable wholly aromatic liquid crystalline polymer capable of forming an anisotropic melt phase at a temperature below approximately 400.degree. C. having enhanced adhesion properties containing from approximately 0.05 to approximately 2.0 mole percent of a recurring sulfonated, ionic moiety in the backbone of the polymer. The polymer is useful for the production of laminate structures.Type: GrantFiled: March 20, 1992Date of Patent: July 13, 1993Assignee: Hoechst Celanese Corp.Inventors: James P. Shepherd, Gerald Farrow, Kurt F. Wissbrun
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Patent number: 5045607Abstract: There are provided new moldable blends of a normally crystalline acetal polymer and a normally non-crystalline elastomeric copolymer of about 15 to 45 mol %, preferably about 25 to 35 mol % of trioxane, about 55 to 85 %, preferably about 65 to 75 mol % of 1,3-dioxolane, said mol percents based on the total of trioxane and 1,3-dioxolane, and about 0.005 to 0.15 wt. %, preferably about 0.05 to 0.12 wt. % of 1,4-butanediol diglycidyl ether or butadiene diepoxide as a bifunctional monomer, based on the total weight of copolymer.Type: GrantFiled: April 5, 1989Date of Patent: September 3, 1991Assignee: Hoechst Celanese Corp.Inventors: Kurt F. Wissbrun, Hongkyu Kim, George L. Collins, Diane Terrone
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Patent number: 4937312Abstract: There are provided new elastomeric copolymers of about 15 to 45 mol %, preferably about 25 to 35 mol % trioxane, about 55 to 85 mol %, preferably about 65 to 75 mol % of 1,3-dioxolane, said mol percents based on the total of trioxane and 1,3-dioxolane, and about 0.005 to 0.15 wt. %, preferably about 0.05 to 0.12 wt. % of 1,4-butanediol diglycidyl ether or butadiene diepoxide as a bifunctional monomer, based on the total weight of copolymer. The elastomeric copolymers may be prepared by mixing said monomers in a substantially dry state and under an inert atmosphere with a cationic polymerization catalyst, e.g., p-nitrobenzenediazonium tetrafluoroborate. The elastomeric copolymers have a strong interaction with moldable, crystalline acetal polymers comprising at least 85 mol % of polymerized oxymethylene units and may be used as a blending agent with such crystalline acetal polymers or as a bonding agent to improve the adhesiveness of the crystalline acetal polymer to other materials.Type: GrantFiled: December 11, 1989Date of Patent: June 26, 1990Assignee: Hoechst Celanese Corp.Inventors: George L. Collins, Kurt F. Wissbrun, Hongkyu Kim
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Patent number: 4898925Abstract: There are provided new elastomeric copolymers of about 15 to 45 mol %, preferably about 25 to 35 mol % trioxane, about 55 to 85 mol %, preferably about 65 to 75 mol % of 1,3-dioxolane, said mol percents based on the total of trioxane and 1,3-dioxolane, and about 0.005 to 0.15 wt. %, preferably about 0.05 to 0.12 wt. % of 1,4-butanediol diglycidyl ether or butadiene diepoxide as a bifunctional monomer, based on the total weight of copolymer. The elastomeric copolymers may be prepared by mixing said monomers in a substantially dry state and under an inert atmosphere with a cationic polymerization catalyst, e.g, p-nitrobenzenediazonium tetrafluoroborate. The elastomeric copolymers have a strong interaction with moldable, crystalline acetal polymers comprising at least 85 mol % of polymerized oxymethylene units and may be used as a blending agent with such crystalline acetal polymers or as a bonding agent to improve the adhesiveness of the crystalline acetal polymer to other materials.Type: GrantFiled: September 12, 1988Date of Patent: February 6, 1990Assignee: Hoechst Celanese CorporationInventors: George L. Collins, Kurt F. Wissbrun, Hongkyu Kim
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Patent number: 4816107Abstract: Oxymethylene polymer bonded articles, such as multilayer laminates, are disclosed. Such articles are prepared by bonding together at least two articles shaped or molded from crystalline oxymethylene homo-, co- and terpolymers using, as an adhesive, a low Tg copolymer of trioxane and 1,3-dioxolane which have a dioxolane content greater than 65 mol percent and less than about 75 mol percent and an IV of from about 1.0 to about 2.3, and which are non-crystalline at room temperature or above.Type: GrantFiled: September 14, 1987Date of Patent: March 28, 1989Assignee: Hoechst Celanese Corp.Inventors: George L. Collins, Kurt F. Wissbrun
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Patent number: 4540737Abstract: A method for the production of composite articles by pultrusion is provided wherein the articles comprise thermotropic liquid crystalline polymers and reinforcing fibers. The liquid crystalline polymers employed exhibit physical characteristics such that the negative slope of a dynamic viscosity-frequency curve (as defined) is less than about 0.35. The use of polymers having such rheological characteristics enables a composite material to be produced by pultrusion in which the polymer is uniformly dispersed among the reinforcing fibers.Type: GrantFiled: February 7, 1983Date of Patent: September 10, 1985Assignee: Celanese CorporationInventors: Kurt F. Wissbrun, Richard D. Orwoll
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Patent number: 4325903Abstract: A process for the extrusion of melt processable liquid crystal polymer which provides improved processability characteristics is provided. The process comprises the steps of subjecting the liquid crystal polymer to an elevated temperature between the DSC transition temperature and the degradation temperature of the polymer; cooling the liquid crystal polymer to a processing temperature which is between the DSC transition temperature and the elevated temperature and at which the liquid crystal polymer is less subject to degradation than at the elevated temperature; and extruding the liquid crystal polymer into the form of a shaped article having mechanical properties which are improved over those of articles formed from liquid crystal polymer which has not been subjected to the elevated temperature.Type: GrantFiled: July 15, 1980Date of Patent: April 20, 1982Assignee: Celanese CorporationInventors: Kurt F. Wissbrun, Yoshiaki Ide
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Patent number: 4234708Abstract: A process is disclosed for producing a modified polyethylene iso-terephthalate copolymer which may be processed into plastic containers using conventional extrusion blow molding equipment. The copolymer is modified by the incorporation into a polyethylene iso/terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene iso/terephthalate copolymer having high zero shear rate melt viscosity and shear sensitivity. This modified copolymer is transparent when extrusion blow molded into a shaped article. The modified copolymer may be extrusion blow molded in intermittent and continuous processes.Type: GrantFiled: April 23, 1979Date of Patent: November 18, 1980Assignee: Celanese CorporationInventors: Robert Edelman, Frank M. Berardinelli, Kurt F. Wissbrun
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Patent number: 4219527Abstract: A process is disclosed for modifying polyethylene terephthalate so that the polyethylene terephthalate may be processed into plastic containers using conventional extrusion blow molding equipment. The polyethylene terephthalate is modified by the incorporation into a polyethylene terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene terephthalate polymer having high zero shear rate melt viscosity and shear sensitivity. This modified polyethylene terephthalate polymer may be extrusion blow molded in intermittent and continuous processes.Type: GrantFiled: October 31, 1978Date of Patent: August 26, 1980Assignee: Celanese CorporationInventors: Robert Edelman, Frank M. Berardinelli, Kurt F. Wissbrun
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Patent number: 4161579Abstract: A process is disclosed for modifying polyethylene terephthalate so that the polyethylene terephthalate may be processed into plastic containers using conventional extrusion blow molding equipment. The polyethylene terephthalate is modified by the incorporation into a polyethylene terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene terephthalate polymer having high zero shear rate melt viscosity and shear sensitivity. This modified polyethylene terephthalate polymer may be extrusion blow molded in intermittent and continuous processes.Type: GrantFiled: April 10, 1978Date of Patent: July 17, 1979Assignee: Celanese CorporationInventors: Robert Edelman, Frank M. Berardinelli, Kurt F. Wissbrun