Patents by Inventor Gunther Weymans
Gunther Weymans 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: 5412060Abstract: The invention relates to a process for the production of polycarbonates by the two-phase interfacial method in which deviations between measured and estimated variables are continuously minimized by means of a suitably selected observer or filter system on the basis of a process model with an empirical Mark-Houwink relation adapted to the process. The variables estimated by the observer/filter are converted into control variables which are used to set input streams of the production process. Product quality is kept constant, changes in load or set values are quickly intercepted and even disturbances not readily accessible to measurement are taken into account by the process control.Type: GrantFiled: January 31, 1994Date of Patent: May 2, 1995Assignee: Bayer AktiengesellschaftInventors: Claus Wulff, Uwe Hucks, Rolf Bachmann, Gunther Weymans, Jurgen Kadelka, Wolfgang Herrig
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Patent number: 5368699Abstract: A method of controlling concentrations in process technology operations--preferentially in thermal separation technology--using a non-linear, pressure-compensated temperature as control signal. The method can be used flexibly within a wide operating range.Type: GrantFiled: February 3, 1993Date of Patent: November 29, 1994Assignee: Bayer AktiengesellschaftInventors: Franz F. Rhiel, Gunther Weymans, Said Mahiout
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Patent number: 5363905Abstract: A method of controlling a heat exchanger wherein the enthalpy flow into the heat exchanger serves as a correcting variable. The robust and versatile control method is particularly suitable for use in endothermic reactions and for distillation.Type: GrantFiled: March 1, 1993Date of Patent: November 15, 1994Assignee: Bayer AktiengesellschaftInventors: Franz F. Rhiel, Heinrich Steude, Gunther Weymans, Klaus Elgeti
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Patent number: 5275758Abstract: The invention relates to ultrafine suspensions of bisphenol, sodium hydroxide and water for the production of polycarbonates by the two-phase interfacial process. According to the invention, these suspensions are prepared by cooling bisphenolate concentrations near the solubility limit in aqueous sodium hydroxide with intensive mixing at relatively high temperatures and precipitating bisphenolate or more bisphenolate in the form of fine droplets during the cooling process. The ultrafine suspensions provide for a high volume/time yield in the interfacial reaction.Type: GrantFiled: September 1, 1992Date of Patent: January 4, 1994Assignee: Bayer AktiengesellschaftInventors: Claus Wulff, Reinhard Schomacker, Jurgen Kadelka, Jurgen Heuser, Gunther Weymans, Konrad Hable
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Patent number: 5260418Abstract: A continuous process for the removal of electrolytes and catalysts from organic polycarbonate solutions is disclosed. Accordingly, a solution obtained in the course of the two-phase interfacial reaction for the preparation of polycarbonate, containing thermoplastic aromatic polycarbonate and an organic solvent and up to 10 parts by weight water as well as residues of chain terminators, branching agents and diphenols is washed with water and/or hydrochloric acid through a cascading train of centrifuges. The resulting polycarbonate resin is characteristically of extremely low iron content.Type: GrantFiled: November 17, 1992Date of Patent: November 9, 1993Assignee: Bayer AktiengesellschaftInventors: Claus Wulff, Jurgen Heuser, Gunther Weymans
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Patent number: 5258484Abstract: A process for the continuous production of a thermoplastic aromatic polycarbonate is disclosed. Accordingly, in a reactor system which includes a tube reactor and a tank equipped with a stirrer, there are reacted a preheated dialkali diphenolate aqueous solution with gaseous phosgene in CH.sub.2 Cl.sub.2 and/or in chlorobenzene solution containing excess phosgene, in a mixer to form a mixed emulsion. The emulsion is then transported at least partly against the force of gravity into the tube reactor to facilitate a polycondensation reaction and in which after a residence time of at least 10 seconds and without dissipation of the heat of reaction there is added a chain terminator. The heat of reaction is dissipated in said tank and aqueous sodium hydroxide and catalyst are added to complete the reaction. The process according to the invention leads to high yields of phosgene.Type: GrantFiled: June 19, 1992Date of Patent: November 2, 1993Assignee: Bayer AktiengesellschaftInventors: Reinhard Schomacker, Uwe Hucks, Gunther Weymans, Wolfgang Herrig, Jurgen Kirsch
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Patent number: 5250658Abstract: According to the invention, a special process for isolating polycarbonate from methylene chloride at temperatures of 30.degree. to 80.degree. C. in the form of a powder with residual solvent contents below 5% by weight is started up as a continuous process by starting up in a two-component nozzle, in which CO.sub.2 -containing fluid and the polymer solution are continuously combined, with a large excess of CO.sub.2 and then allowing the polycarbonate/methylene chloride/CO.sub.2 fluid system to pass through the gel-forming range of the polycarbonate/methylene chloride/CO.sub.2 phase diagram with continuous reduction of the CO.sub.2 throughput to a ratio of CO.sub.2 to organic solution of 4:1 to 2:1. The process started up in this way has a particularly long useful life.Type: GrantFiled: September 4, 1992Date of Patent: October 5, 1993Assignee: Bayer AktiengesellschaftInventors: Hanns-Ingolf Paul, Rolf Treckmann, Gunther Weymans, Jurgen Kirsch, Wolfgang Herrig
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Patent number: 5248763Abstract: A process for isolating a poly(ester)carbonate resin from its methylene chloride solution is disclosed. The process entails combining a solution which contains 5 to 30% by weight resin with carbon dioxide fluid in a two-component nozzle under pressures of 90 to 180 bar and at temperatures of 50.degree. to 75.degree. C., while maintaining in said the two-component nozzle a back-pressure of 85 to 150 bar, and introducing the resin into a separation vessel with retention of dust particles. Importantly, the relative quantities of carbon dioxide fluid and polymer solution used in the two-component nozzle are between 10 and 3 parts carbon dioxide fluid per one part of polymer solution, and the carbon dioxide fluid contains 10 to 1000 ppm methylene chloride. The process avoids blockage of said nozzle.Type: GrantFiled: August 20, 1992Date of Patent: September 28, 1993Assignee: Bayer AktiengesellschaftInventors: Jurgen Kirsch, Gunther Weymans, Dieter Freitag
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Patent number: 5244544Abstract: A process for the separation of multicomponent systems containing intermediate boiling substances in separating separating columns with side discharge, the temperatures T.sub.u and T.sub.o above and below the side discharge are measured on the column or inside the column and the temperature difference T.sub.u -T.sub.o is used for controlling the side discharge. The control is carried out by constantly controlling one of the two temperatures T.sub.u or T.sub.o by the output of the evaporator or the discharge from the sump or the reflux or the removal of distillate or the reflux ratio.Type: GrantFiled: May 8, 1992Date of Patent: September 14, 1993Assignee: Bayer AktiengesellschaftInventors: Lothar Lang, Franz F. Rhiel, Gunther Weymans
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Patent number: 5235026Abstract: An improvement to the continuous process for the production of polycarbonates by interphase polycondensation is described. Accordingly, the organic phase and the aqueous phase are combined in a tube, forming chlorocarbonic acid ester and further alkali hydroxide is added at, or shortly after, the maximum concentration of said ester is reached. The resulting emulsion is then changed to an oil-in-water emulsion which is then separated and worked up in known manner.Type: GrantFiled: May 29, 1992Date of Patent: August 10, 1993Assignee: Bayer AktiengesellschaftInventors: Claus Wulff, Hermann Kauth, Gunther Weymans, Zoltan Kricsfalussy, Wolfgang Alewelt, Jurgen Heuser
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Patent number: 5229486Abstract: A process for isolating polymers from their solvents by addition of fluids containing carbon dioxide at temperatures of 30.degree. to 280.degree. C. and under pressures of 1 to 1,000 bar is disclosed. The process is characterized in that the concentration of the polymers in their solvents is between 5% and 80% by weight and the fluid containing carbon dioxide consists of at least 50% by weight carbon dioxide.Type: GrantFiled: December 11, 1991Date of Patent: July 20, 1993Assignee: Bayer AktiengesellschaftInventors: Hanns-Ingolf Paul, Rolf Treckmann, Gunther Weymans, Jurgen Kirsch, Jurgen Heuser, Klaus Elgeti
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Patent number: 5227458Abstract: Dihydroxydiphenyl cycloalkanes corresponding to the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl and C.sub.7 -C.sub.12 aralkyl,m is an integer of from 4 to 7,R.sup.3 and R.sup.4, individually selectable for each X, independently of one another represent hydrogen or C.sub.1 -C.sub.6 alkylandX represents carbon with the proviso that, at at least one atom X, both R.sup.3 and R.sup.4 are alkyl,a process for their production, their use for the production of high molecular weight polycarbonates, the polycarbonates made from dihydroxydiphenyl cycloalkane of formula (I) and films made from these polycarbonates.Type: GrantFiled: March 31, 1992Date of Patent: July 13, 1993Assignee: Bayer AktiengesellschaftInventors: Dieter Freitag, Uwe Westeppe, Claus H. Wulff, Karl-Herbert Fritsch, Carl Casser, Gunther Weymans, Lutz Schrader, Werner Waldenrath
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Patent number: 5221731Abstract: A continuous process for the isolation of polycarbonates from a solution of polycarbonate in methylene chloride at temperatures of 30.degree. to 80.degree. C. is disclosed. The process which yields polycarbonate in powder form having residual solvent content of less than 5% by weight, is characterized in that it entails the following steps:a) obtaining a solution of polycarbonate in methylene chloride containing 10 to 40 percent polycarbonate, said percent being relative to the total weight of the polycarbonate solution,b) mixing into said solution under pressures of 10 to 50 bar and at temperatures of 30.degree. to 50.degree. C. a fluid containing carbon dioxide resulting in a non-gelling polycarbonate/methylene/chloride/dioxide pressurized system, in which between 10 and 12% CO.sub.2 are dissolved,c) mixing said pressurized system in a two-component nozzle with additional fluid containing carbon dioxide under a pressure of 50 to 300 bar and at temperatures of 40.degree. to 150.degree. C.Type: GrantFiled: May 26, 1992Date of Patent: June 22, 1993Assignee: Bayer AktiengesellschaftInventors: Gunther Weymans, Jurgen Kirsch, Wolfgang Herrig, Hanns-Ingolf Paul, Rolf Treckmann
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Patent number: 5198525Abstract: Aromatic polyether sulfones based on 5 to 90 mol-%, based on total bisphenols, of special dihydroxydiphenyl cycloalkanes and 10 to 95 mol-% based on the bisphenols of specific phthaleins, a process for their production and their use as molding compounds.Type: GrantFiled: May 21, 1990Date of Patent: March 30, 1993Assignee: Bayer AktiengesellschaftInventors: Knud Reuter, Wolfgang Jilge, Bernd Pittel, Gunther Weymans
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Patent number: 5149761Abstract: The new aromatic ether imides corresponding to the following formula ##STR1## may be used for the production of plastics which in turn may be worked up into moulded articles, films, sheet products and filaments. The plastics produced from the new aromatic ether imides are distinguished by their exceptional dimensional stability under heat.Type: GrantFiled: November 1, 1990Date of Patent: September 22, 1992Assignee: Bayer AktiengesellschaftInventors: Knud Reuter, Dieter Freitag, Gunther Weymans, Rolf Dhein
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Patent number: 5138031Abstract: The invention relates to linear and branched poly-p-arylene sulfides (PAS), preferably poly-p-phenylene sulfides (PPS), which have an extremely low proportion of defect or foreign structures, to a process for their production and to their use for the production of molded articles.Type: GrantFiled: November 13, 1989Date of Patent: August 11, 1992Assignee: Bayer AktiengesellschaftInventors: Ernst-Ulrich Dorf, Wolfgang Russeler, Gunther Weymans, Manfred Schmidt, Erich Meier
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Patent number: 5132154Abstract: An article for an optical application is disclosed comprisinga) about 0.1 to 99.9 wt. % of a thermoplastic, aromatic polycarbonate resin containing carbonate structural units corresponding to (Ia): ##STR1## wherein R.sup.1 and R.sup.2 independently represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl or C.sub.7 -C.sub.12 aralkyl; m represents an integer of from 4 to 7;R.sup.3 and R.sup.4, which are selected individually for each X, independently represent hydrogen or C.sub.1 -C.sub.6 alkyl; andX represents a carbon atom;provided that R.sup.3 and R.sup.4 both represent alkyl on at least one X atom; andb) from 99.9 to 0.1 wt. % of at least one thermoplastic polycarbonate other than component (a).Type: GrantFiled: May 31, 1990Date of Patent: July 21, 1992Assignee: Bayer AktiengesellschaftInventors: Uwe Westeppe, Gunther Weymans, Dieter Freitag, Karsten-Josef Idel
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Patent number: 5126428Abstract: Dihydroxydiphenyl cycloalkanes corresponding to the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl and C.sub.7 -C.sub.12 aralkyl,m is an integer of from 4 to 7,R.sup.3 and R.sup.4, individually selectable for each X, independently of one another represent hydrogen or C.sub.1 -C.sub.6 alkyl andX represents carbon with the proviso that, at least one atom X, bothR.sup.3 and R.sup.4 are alkyl,a process for their production, their use for the production of high molecular weight polycarbonates, the polycarbonates made from dihydroxydiphenyl cycloalkane of formula (I) and films made from these polycarbonates.Type: GrantFiled: October 15, 1990Date of Patent: June 30, 1992Assignee: Bayer AktiengesellschaftInventors: Dieter Freitag, Uwe Westeppe, Claus H. Wulff, Karl-Herbert Fritsch, Carl Casser, Gunther Weymans, Lutz Schrader, Werner Waldenrath
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Patent number: 5115076Abstract: Aromatic polyether ketones based on 5 to 90 mol-%, based on the total quantity of all bisphenols, of special dihydroxydiphenyl cycloalkanes and 10 to 95% phthaleins, a process for their production and their use as molding compounds.Type: GrantFiled: May 21, 1990Date of Patent: May 19, 1992Assignee: Bayer AktiengesellschaftInventors: Knud Reuter, Wolfgang Jilge, Bernd Pittel, Gunther Weymans
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Patent number: 5109076Abstract: Thermoplastic polydiorganosiloxane/polycarbonate block copolymers based on dihydroxydiphenylcycloalkanes corresponding to the following general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 independently represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1 -C.sub.8 alkyl, C.sub.5 or C.sub.6 cycloalkyl, C.sub.5 -C.sub.10 aryl or C.sub.7 -C.sub.12 aralkyl, preferably phenyl-C.sub.1 -C.sub.4 -alkyl, in particular benzyl: m represents an integer of from 4 to 7, preferably 4 or 5;R.sup.3 and R.sup.4 may be chosen individually for each X and independently represent hydrogen or C.sub.1 -C.sub.12 alkyl; andX represents carbon; with the proviso that R.sup.3 and R.sup.4 both represent alkyl on at least one atom X,having an average molecular weight M.sub.w (weight average) of 10 000 to 300 000, a content of aromatic polycarbonate of 21 to 99.5% by weight and a content of polyorganosiloxane of 79 to 0.5% by weight.Type: GrantFiled: December 13, 1989Date of Patent: April 28, 1992Assignee: Bayer AktiengesellschaftInventors: Dieter Freitag, Uwe Westeppe, Alfred Jung, Peter Horlacher, Gunther Weymans, Ulrich Grigo, Leo Morbitzer, Karsten-Josef Idel