Patents by Inventor Hartmut Schikowsky
Hartmut Schikowsky 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: 8119734Abstract: The present invention relates to a process for preparing aqueous dispersions. The invention also relates to the formation of core-shell particles in aqueous dispersions. The core-shell particles are useful as impact-modifiers for poly(meth)acrylate moulding compositions.Type: GrantFiled: October 18, 2003Date of Patent: February 21, 2012Assignee: Evonik Roehm GmbHInventors: Klaus Schultes, Thomas Suefke, Reiner Mueller, Hartmut Schikowsky, Werner Hoess
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Publication number: 20110218291Abstract: The present invention relates to a process for preparing aqueous dispersions. The invention also relates to the formation of core-shell particles in aqueous dispersions. The core-shell particles are useful as impact-modifiers for poly(meth)acrylate moulding compositions.Type: ApplicationFiled: May 18, 2011Publication date: September 8, 2011Applicant: EVONIK ROEHM GMBHInventors: Klaus SCHULTES, Thomas Suefke, Reiner Mueller, Hartmut Schikowsky, Werner Hoess
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Publication number: 20100239666Abstract: The invention relates to a process for producing mouldings by injection moulding the steps in the process being a) melting and mixing of a (meth)acrylate copolymer composed of from 85 to 98% by weight of C1-C4-alkyl (meth)acrylates capable of free-radical polymerization and from 15 to 2% by weight of (meth)acrylate monomers having a quaternary ammonium group in the alkyl radical, with from 10 to 25% by weight of a plasticizer, and also from 10 to 50% by weight of a dryers [sic] and/or from 0.1 to 3% by weight of a release agent, and, where appropriate, with other conventional pharmaceutical additives or auxiliaries and/or with an active pharmaceutical ingredient, b) devolatilizing the mixture at temperatures of at least 120° C., thus reducing the content of the low-boiling constituents with a vapour pressure of at least 1.9 bar at 120° C. to not more than 0.5% by weight, and c) injecting the devolatilized mixture at a temperature of from 80 to 160° C.Type: ApplicationFiled: June 3, 2010Publication date: September 23, 2010Inventors: Hans-Ulrich Petereit, Thomas Beckert, Manfred Assmus, Wemer Hoess, Wolfgang Fuchs, Hartmut Schikowsky
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Publication number: 20080260814Abstract: Processes for producing moldings by injection moulding, include melting a mixture made from a (meth)acrylate copolymer and a release agent, devolatilizing the mixture, injecting the molten and devolatilized mixture into a mold cavity of an injection mold, cooling the molten mixture, and removing the resultant molding from the mold.Type: ApplicationFiled: April 21, 2008Publication date: October 23, 2008Applicant: ROEHM GmBH & CO. KGInventors: Hans-Ulrich PETEREIT, Thomas Beckert, Manfred Assmus, Werner Hoess, Wolfgang Fuchs, Hartmut Schikowsky
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Publication number: 20060052515Abstract: The present invention relates to a process for preparing an aqueous dispersion, by a) forming an initial charge from water and emulsifier, b) adding from 25.0 to 45.0 parts by weight of a first composition comprising A) from 50.0 to 99.9 parts by weight of alkyl methacrylates, B) from 0.0 to 40.0 parts by weight of alkyl acrylates, C) from 0.1 to 10.0 parts by weight of crosslinking monomers and D) from 0.0 to 8.0 parts by weight of styrenic monomers and polymerizing, c) adding from 35.0 to 55.0 parts by weight of a second composition comprising E) from 80.0 to 100.0 parts by weight of (meth) acrylates F) from 0.05 to 10.0 parts by weight of crosslinking monomers and G) from 0.0 to 20.0 parts by weight of styrenic monomers, and polymerizing, d) adding from 10.0 to 30.0 parts by weight of a third composition comprising H) from 50.0 to 100.0 parts by weight of alkyl methacrylates, I) from 0.0 to 40.0 parts by weight of alkyl acrylates and J) from 0.0 to 10.Type: ApplicationFiled: October 18, 2003Publication date: March 9, 2006Applicant: Roehm Gmbh & Co. KGInventors: Klaus Schultes, Thomas Suefke, Reiner Mueller, Hartmut Schikowsky, Werner Hoess
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Publication number: 20040104501Abstract: The invention relates to a process for producing mouldings by injection moulding the steps in the process being a) melting and mixing of a (meth)acrylate copolymer composed of from 85 to 98% by weight of C1-C4-alkyl (meth)acrylates capable of free-radical polymerization and from 15 to 2% by weight of (meth)acrylate monomers having a quaternary ammonium group in the alkyl radical, with from 10 to 25% by weight of a plasticizer, and also from 10 to 50% by weight of a dryers [sic] and/or from 0.1 to 3% by weight of a release agent, and, where appropriate, with other conventional pharmaceutical additives or auxiliaries and/or with an active pharmaceutical ingredient, b) devolatilizing the mixture at temperatures of at least 120° C., thus reducing the content of the low-boiling constituents with a vapour pressure of at least 1.9 bar at 120° C. to not more than 0.5% by weight, and c) injecting the devolatilized mixture at a temperature of from 80 to 160° C.Type: ApplicationFiled: June 27, 2003Publication date: June 3, 2004Inventors: Hans-Ulrich Petereit, Thomas Beckert, Manfred Assmus, Werner Hoess, Wolfgang Fuchs, Hartmut Schikowsky
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Patent number: 6613871Abstract: The invention relates to a method for reducing the polymer content in the wastewater from dewatering of two-phase liquid mixtures comprising a thermoplastic plastic melt and an aqueous phase by coagulating the plastic melt and pressing the water out of the melt cake in an extruder system, characterized in that superheated steam with a temperature of at least 280° C. is injected immediately after introduction of the two-phase liquid mixture into the extruder system.Type: GrantFiled: April 10, 2002Date of Patent: September 2, 2003Assignee: Roehm GmbH & Co. KGInventors: Werner Hoess, Hartmut Schikowsky, Krzysztof Sado
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Patent number: 6576255Abstract: The invention relates to a process for making molded articles by means of injection molding with the process steps of a) melting of a (meth)acrylate copolymer, which is composed of 30 to 80 wt % of radical-polymerized C1 to C4 alkyl esters of acrylic or methacrylic acid and 70 to 20 wt % of (meth)acrylate monomers with a tertiary ammonium group in the alkyl residue, wherein the (meth)acrylate copolymer is present in a mixture with 1 to 70 wt % of a plasticizer and a desiccant in the ratio of 1:1 to 1:20 and also with 0.05 to 5 wt % of a release agent, and further standard additives or adjuvants and if necessary even a pharmaceutical active principle can also be present in the mixture, and before the mixture is melted it has a content of more than 0.5 wt % of low-boiling constituents with a vapor pressure of at least 1.9 bar at 120° C., b) degassing of the mixture in the thermoplastic condition at temperatures of at least 120° C.Type: GrantFiled: July 30, 2001Date of Patent: June 10, 2003Assignee: Roehm GmbH & Co. KGInventors: Hans-Ulrich Petereit, Thomas Beckert, Manfred Assmus, Werner Hoess, Wolfgang Fuchs, Hartmut Schikowsky
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Publication number: 20020188098Abstract: The invention relates to a method for reduction of the polymer content in the wastewater from dewatering of two-phase liquid mixtures comprising a thermoplastic plastic melt and an aqueous phase by coagulating the plastic melt and pressing the water out of the melt cake in an extruder system, characterized in that superheated steam with a temperature of at least 280° C. is injected immediately after introduction of the two-phase liquid mixture into the extruder system.Type: ApplicationFiled: April 10, 2002Publication date: December 12, 2002Inventors: Werner Hoess, Hartmut Schikowsky, Krzysztof Sado
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Publication number: 20020160042Abstract: The invention relates to a process for producing mouldings by injection moulding, the steps in the process beingType: ApplicationFiled: August 31, 2001Publication date: October 31, 2002Inventors: Hans-Urich Petereit, Thomas Beckert, Manfred Assmus, Werner Hoess, Wolfgang Fuchs, Hartmut Schikowsky
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Patent number: 6287470Abstract: The invention relates to a method for dehydrating a two-phase liquid mixture consisting of a thermoplastic synthetic melt phase and an aqueous phase, comprising the following steps: a) coagulation of the two-phase liquid mixture in a first extruder; b) dehydration of the coagulate in a twin screw extruder with a de-watering zone and screws working in an opposite direction; c) separation of constituents by degasifying. The inventive method is characterized in that a single screw extruder or a twin screw extruder with screws working in the same direction is used as a first extruder in step a).Type: GrantFiled: December 13, 1999Date of Patent: September 11, 2001Assignee: Roehm GmbHInventors: Heinz Vetter, Hartmut Schikowsky, Werner Hoess
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Patent number: 6040387Abstract: Molding compositions MC having a reduced tendency to yellow with thermal stress which consist of a polymer PM containing units of formula I: ##STR1## blending from 0.005-1 wt % of at least one reducing inorganic phosphorus compound IP selected from the group consisting of phosphinic and phosphonic acid and its alkali metal, alkaline-earth metal, aluminum and ammonium salts, wherein the ammonium ion can be substituted with up to four C.sub.1 -C.sub.4 alkyl and/or C.sub.5 -C.sub.8 cycloalkyl groups, with the polymer PM after conclusion of the imidation reaction.Type: GrantFiled: May 12, 1998Date of Patent: March 21, 2000Assignee: Roehm GmbH Chemische FabrikInventors: Klaus Albrecht, Werner Hoess, Hartmut Schikowsky
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Patent number: 5837780Abstract: Molding compositions MC having a reduced tendency to yellow with thermal stress which consist of a polymer PM containing units of formula I: ##STR1## blending from 0.005-1 wt % of at least one reducing inorganic phosphorus compound IP selected from the group consisting of phosphinic and phosphonic acid and its alkali metal, alkaline-earth metal, a aluminum and ammonium salts, wherein the ammonium ion can be substituted with up to four C.sub.1 -C.sub.4 alkyl and/or C.sub.5 -C.sub.8 cycloalkyl groups, with the polymer PM after conclusion of the imidation reaction.Type: GrantFiled: December 2, 1996Date of Patent: November 17, 1998Assignee: Roehm GmbH Chemische FabrikInventors: Klaus Albrecht, Werner Hoess, Hartmut Schikowsky
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Patent number: 5650107Abstract: A two phase liquid mixture of a thermoplastic synthetic resin melt and an aqueous phase, such as a latex coagulate, is dewatered in a counter-rotating twin screw extruder under a pressure which is greater that the water vapor pressure at the temperature of the melt of the thermoplastic synthetic resin by conveying the melt into partially filled screw channels in the dewatering zone and restricting it in at least one of these screw channels in the entry nip of the twin screws to create a local, narrowly limited, steep pressure gradient and to form a coherent melt cake, and draining the water in liquid form from beneath under gravity upstream from the boundary of the melt cake so that the melt cake does not stand in contact with a coherent aqueous phase.Type: GrantFiled: May 12, 1995Date of Patent: July 22, 1997Assignee: Rohm GmbHInventors: Heinz Vetter, Hartmut Schikowsky
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Patent number: 5548033Abstract: A plastic melt is treated for a short-time with a liquid treatment agent under pressure, it is divided into defined subquantities, individual subquantities are brought into contact with a treatment agent and combined for a residence time of less than one second with portions of at least one other subquantity, and portions of the mixture thus formed are separated and combined with another subquantity; the steps of dividing and combining the mixture are repeated several times at intervals of less than one second until an intimate mixture of the plastic melt and the treatment agent has formed, allowing the preparation of especially homogeneously structured thermoplastic materials, e.g., poly(methacrylalkylimide) plastics, which are compatible with poly(methyl methacrylate).Type: GrantFiled: January 27, 1995Date of Patent: August 20, 1996Assignee: Roehm GmbH Chemische FabrikInventors: Heinz Vetter, Werner Hoess, Joachim Dutschke, Hartmut Schikowsky
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Patent number: 5135985Abstract: Homogeneous polymer mixtures of polymethacrylimides consist of a component (A), composed of from 30 to 90 percent by weight of methacrylalkylimide units and from 3.5 to 10 percent by weight of methacrylic acid units, and of a component (B1) or (B2) having from 10 to 50 percent by weight more methacrylalkylimide units than component (A), component (B1) having a degree of imidization of less than 95 percent and containing from 3.5 to 10 percent by weight of methacrylic acid units, and component (B2) having a degree of imidization greater than 95 percent and containing less than 3.5 percent by weight of methacrylic acid units.Type: GrantFiled: May 10, 1991Date of Patent: August 4, 1992Assignee: Rohm GmbHInventors: Werner Hoess, Heinz Vetter, Jens-Dieter Fischer, Hartmut Schikowsky
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Patent number: 4733718Abstract: Heat exchanger or heat accumulator bodies which are simple to produce. The bodies consist of a stack of extruded hollow chamber panels with plane smooth outer walls and webs that join the outer walls in a single piece. The hollow chamber panels are joined to one another in the stack on the front side by locking connections. The locking connections can be produced with an inserted electrical band heater, by glue seams, or by undercut interlockings. The hollow chamber panels are not joined to one another in the in-between areas or are not everywhere joined in the in-between areas.Type: GrantFiled: July 3, 1985Date of Patent: March 29, 1988Assignee: Roehm GmbH Chemische FabrikInventors: Hartmut Schikowsky, Heinz Gross, Herbert Helm, Klaus E. Poehlmann, Karl-Heinrich Schanz, Heinz Vetter
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Patent number: 4515648Abstract: What is disclosed is a method for making a gastight multiple-walled panel of extruded resin from an integrally extruded hollow panel comprising two parallel, plane outer walls having supporting partitions disposed between them and defining long hollow cells with open end faces, which method comprises heating the hollow panel at least in the area of the open end faces of said hollow cells until the resin is in the thermoplastic state, and then heat sealing the two outer walls in the thermoplastic area thereof in a gastight manner either to each other or to a tape of a further thermoplastic material covering the end faces, the seal so produced being held for at least 1 minute at a temperature ranging from 10.degree. C. beneath the Vicat softening point to 20.degree. C. above the Vicat softening point of the resin.Type: GrantFiled: December 15, 1982Date of Patent: May 7, 1985Assignee: Rohm GmbHInventors: Klaus Kolbe, Walter Hellmann, Otmar Krajec, Hartmut Schikowsky, Heinz Vetter
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Patent number: 4235834Abstract: A method is disclosed for biaxially stretching a band of thermoplastic resin which comprises attenuating a band of unstretched resin, in a forming zone while the resin is in the thermoelastic condition, by passing the band between two surfaces spaced at a distance less than the thickness of said band of unstretched resin while permitting said band to expand in width, and then cooling said band to a temperature below the softening point of the resin while maintaining the dimensions of the attenuated and expanded band; apparatus for performing such a method is also disclosed.Type: GrantFiled: February 13, 1978Date of Patent: November 25, 1980Assignee: Rohm GmbHInventors: Heinz Vetter, Ernst Friederich, Karl-Heinz Schanz, Hartmut Schikowsky