Patents by Inventor Siegfried Korte
Siegfried Korte 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: 6637181Abstract: Described is a process for producing segmented polyurethanes having improved processing characteristics in the melt state and an efficient spinning process based thereon to form highly elastic, fine linear density elastane yarn and filament having improved mechanical and thermal properties by using hydroxyalkyl-terminated polysiloxanes in combination with specific crosslinking-capable polyisocyanates in the reaction of long-chain high molecular weight polyhydroxy compounds with organic diisocyanates and low molecular weight diols and also optionally further auxiliary and additive substances in the melt.Type: GrantFiled: December 1, 2000Date of Patent: October 28, 2003Assignee: Bayer AktiengesellschaftInventors: Siegfried Korte, Rolf-Volker Meyer, Stefan Hütte
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Patent number: 6339117Abstract: The present invention relates to polymers whitened with optical brighteners obtained by (a) emulsion polymerization of acrylonitrile with or without a comonomer in the presence or absence of a graftable substrate, and (b) addition of an optical brightener before, during, or after the emulsion polymerization.Type: GrantFiled: February 28, 2000Date of Patent: January 15, 2002Assignee: Bayer AktiengesellschaftInventors: Udo Eckstein, Siegfried Korte, Ulrich Feldhues, Hans-Peter Geiger, Bernhard Hunke, Thomas Roick, Günter Sackmann
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Patent number: 6288158Abstract: A process for modifying superabsorbent polymers is disclosed. The surface of a polymer containing hydrolyzed polyacrylonitrile in the form of particulates, is modified by crosslinking in a water/alcohol reaction mixture and in the presence of silica. The resulting product features improved absorbency under load and lesser degree of gel blocking.Type: GrantFiled: February 9, 1999Date of Patent: September 11, 2001Assignee: Bayer AktiengesellschaftInventors: Sergej Schapowalov, Günter Sackmann, Rolf-Volker Meyer, Siegfried Korte
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Publication number: 20010020070Abstract: Water-soluble homo- and/or copolymers containing alkali metal and/or alkaline earth metal carboxylate groups and based on acrylic or methacrylic derivatives, and corresponding water-soluble homo- and/or copolymers containing carboxyl groups and homo- and/or copolymers containing ammonium carboxylate groups are provided, which homo- and/or copolymers possess excellent suitability for increasing the viscosity of aqueous systems, in particular of print pastes for textile treatment.Type: ApplicationFiled: February 1, 2001Publication date: September 6, 2001Inventors: Thomas Gross, Siegfried Korte, Rolf-Volker Meyer, Hans-Jorg Seiler
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Publication number: 20010009938Abstract: The present invention relates to polymers whitened with optical brighteners obtained byType: ApplicationFiled: February 28, 2000Publication date: July 26, 2001Inventors: UDO ECKSTEIN, SIEGFRIED KORTE, ULRICH FELDHUES, HANS-PETER GEIGER, BERNHARD HUNKE, THOMAS ROICK, GUNTER SACKMANN
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Patent number: 6156848Abstract: Super-absorbent polymer in the form of pre-formed spherical particles obtainable by alkaline hydrolysis of aqueous emulsions of crosslinked and/or un-crosslinked homopolymers and/or copolymers of acrylonitrile in water/alcohol mixtures and the use of the polymer in hygiene products, as a water-storing material in agriculture and for the sheathing of electrical cables.Type: GrantFiled: November 4, 1997Date of Patent: December 5, 2000Assignee: Bayer AGInventors: Gunter Sackmann, Sergej Schapowalow, Siegfried Korte, Rolf-Volker Meyer
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Patent number: 5635569Abstract: Superabsorbent polymers based on partly hydrolysed homopolymers and/or copolymers of acrylonitrile which are cross-linked through the incorporation of polyfunctional monomers, wherein 30 to 80 mol-% of the nitrile groups are converted into carboxylate groups, 20 to 70 mol-% of the nitrile groups are converted into carbonamide groups and 0 mol-% to 20 mol-% of the nitrile groups are unchanged, and the said cross-linked polymers possess a swelling capacity of 700 g/g in water and of up to 60 g/g in physiological saline and a gel strength of from 20 g to 100 g, their preparation and their use.Type: GrantFiled: August 9, 1995Date of Patent: June 3, 1997Assignee: Bayer AktiengesellschaftInventors: Gunter Sackmann, Siegfried Korte, Sergej Schapowalow, Klaus Szablikowski, Wolfgang Koch
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Patent number: 5567779Abstract: A process for the production of super-absorbent polymers with a swelling capacity in water-containing liquids of up to 1,000 g/g in which aqueous emulsions of particularly high molecular weight polymers of acrylonitrile are partly hydrolyzed by reaction with aqueous solutions of alkali metal and/or alkaline earth metal hydroxides, the polymers are precipitated in powder form by addition of water-miscible organic solvents, separated off, dried and then optionally heated for a short time. The super-absorbent polymers are used as water-storing materials, for example in sanitary articles, in agriculture or in the sheathing of electrical cables.Type: GrantFiled: October 20, 1995Date of Patent: October 22, 1996Assignee: Bayer AktiengesellschaftInventors: G unter Sackmann, Rolf-Volker Meyer, Siegfried Korte, Sergej Schapowalow
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Patent number: 5558940Abstract: Oil- and water-repellent papers are treated on the surface or in the pulp of the papers with fluorine-containing copolymers ofa) acrylates containing perfluoroalkyl groups, of the formulaCH.sub.2 .dbd.CR.sup.1 --COO--X--C.sub.n F.sub.2n+1 (I),b) monomers of the formulaCH.sub.2 .dbd.CR.sup.2 --COO--R.sup.3 (II),c) monomers of the formulaCH.sub.2 .dbd.CR.sup.4 --COO--(CH.sub.2 CH.sub.2 O).sub.m --R.sup.5 (III),d) monomers of the formulaCH.sub.2 .dbd.CR.sup.6 --COO--CH.sub.2 CH.sub.2 --N(R.sup.7,R.sup.8) (IVa)or, in salt-like form, of the formula[CH.sub.2 .dbd.CR.sup.6 --COO--CH.sub.2 CH.sub.2 --N(R.sup.7,R.sup.8,R.sup.9)].sup..sym. Y.sup..crclbar. (IVb)or, in N-oxidized form, of the formula ##STR1## and e) monomers of the formulaCH.sub.2 .dbd.CR.sup.10 CONHR.sup.Type: GrantFiled: July 17, 1995Date of Patent: September 24, 1996Assignee: Bayer AktiengesellschaftInventors: Gisbert Michels, Joachim K onig, Uwe Zweering, Siegfried Korte
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Patent number: 5496890Abstract: A process for the production of super-absorbent polymers with a swelling capacity in water-containing liquids of up to 1,000 g/g in which aqueous emulsions of particularly high molecular weight polymers of acrylonitrile are partly hydrolyzed by reaction with aqueous solutions of alkali metal and/or alkaline earth metal hydroxides, the polymers are precipitated in powder form by addition of water-miscible organic solvents, separated off, dried and then optionally heated for a short time. The super-absorbent polymers are used as water-storing materials, for example in sanitary articles, in agriculture or in the sheathing of electrical cables.Type: GrantFiled: February 21, 1995Date of Patent: March 5, 1996Assignee: Bayer AktiengesellschaftInventors: Gu/ nter Sackmann, Rolf-Volker Meyer, Siegfried Korte, Sergej Schapowalow
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Patent number: 5393845Abstract: The invention relates to a process for the continuous production of polyacrylonitrile hydrolyzates and to their use as dispersion and grinding aids for pigments and fillers, such as for example kaolin, CaCO.sub.3 or gypsum.Type: GrantFiled: December 16, 1993Date of Patent: February 28, 1995Assignee: Wolff Walsrode AGInventors: Siegfried Korte, Heinrich Alberts, Branislav Bohmer, Werner Karstens, Wolfgang Koch, Hans-Gunter Poersch-Panke, Klaus Szablikowski
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Patent number: 5356985Abstract: The present invention relates to aqueous emulsions of polymers which contain 80 to 100 weight % of acrylonitrile polymerized within them, to a method for their preparation, and to their use as raw materials for acrylic and modacrylic fibres and as dyeing additives for adjusting the dyestuff affinity of cationic dyestuffs for conventional acrylic and modacrylic polymers and fibre materials produced from them.Type: GrantFiled: September 20, 1993Date of Patent: October 18, 1994Assignee: Bayer AktiengesellschaftInventors: Gunter Sackmann, Siegfried Korte, Heinrich Alberts, Rolf-Volker Meyer
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Patent number: 5238977Abstract: Free-flowing, stable dispersions of crosslinked rubbers in the form of discrete particles having an average diameter of 0.1 to 3 .mu.m in organic liquids, containingI) up to 60% by weight (based on the dispersion as a whole) of a crosslinked, rubber-like, particulate graft polymer of a) a crosslinked silicone rubber as core and crosslinked acrylate rubber b) graft polymerized thereon as the rubber andII) a liquid, organic N,N-substituted amide as the continuous organic phase,and a process for their production.Type: GrantFiled: June 19, 1992Date of Patent: August 24, 1993Assignee: Bayer AktiengesellschaftInventors: Karl-Erwin Piejko, Christian Lindner, Siegfried Korte
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Patent number: 5151458Abstract: This invention relates to new highly fluid polyarylene sulphide-(PAS)-moulding compounds, preferably polyphenylene sulphide-(PPS)-moulding compounds containing low molecular weight, liquid crystalline ester(amide)s.Type: GrantFiled: April 27, 1990Date of Patent: September 29, 1992Assignee: Bayer AktiengesellschaftInventors: Hans-Detlef Heinz, Harald Pielartzik, Klaus Reinking, Rolf-Volker Meyer, Siegfried Korte
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Patent number: 5147955Abstract: Copolymers ofa) phosphonic acid derivatives corresponding to formula (I) ##STR1## wherein Y represents H or CH.sub.3,X represents a single bond or --CH.sub.2 --,R represents an aryl or alkyl,b) maleic anhydride andc) a polymerizable compound containing two or more allyl or methally groups in the molecule.Type: GrantFiled: July 15, 1991Date of Patent: September 15, 1992Assignee: Bayer AktiengesellschaftInventors: Christian Lindner, Siegfried Korte
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Patent number: 5135997Abstract: This invention relates to a process for the radical homo-or copolymerization of acrylonitrile with one or more copolymerizable monomers under reaction conditions such that the monomers are present predominantly in a gaseous form of an adsorbed form and polymerization of the monomers, which are presumably adsorbed, takes place in the solid phase (solvent-free polymerization) and results in pulverulent PAN-(co)polymers. The process is preferably carried out in the presence of small quantities of a mediator substance such as dimethylformamide which does not alter the pulverulent consistency of the PAN-polymers but leads considerably more rapidly and with much improved yields to freshly formed polyacrylonitrile polymers.Type: GrantFiled: September 14, 1990Date of Patent: August 4, 1992Assignee: Bayer AktiengesellschaftInventors: Karl-Heinz Feltgen, Rudiger Franck, Konrad Hable, Siegfried Korte, Manfred Heckenbach
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Patent number: 5134113Abstract: Thermoreactive recording material contains, as developer, a mixture of an acidic-modified polymer of (meth)acrylonitrile and/or methacrylonitrile and a diphenol of the formula ##STR1## in which Y is, for example, a single bond, an alkylene or alkylidene radical, gives, on thermal printing, a dye which has a reduced tendency to sublime.Type: GrantFiled: June 29, 1990Date of Patent: July 28, 1992Assignee: Bayer AktiengesellschaftInventors: Gunter Klug, Hubertus Psaar, Siegfried Korte
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Patent number: 5086150Abstract: This invention relates to a process for the production of light resistant and exhaust gas resistant PUH elastomer threads and films based on segmented polyurethane ureas which are based on diisocyanate mixtures of from 30 to 85 mol% of trans-1,4-cyclohexylene diisocyanate and from 70 to 15 mol% of other aliphatic or cycloaliphatic diisocyanates. The diisocyanates are first reacted with relatively high molecular weight dihydroxy compounds and optionally low molecular weight diols to form an isocyanate prepolymer which is then reacted with aliphatic diamines or diamine mixtures, preferably ethylene diamine, in highly polar solvents, optionally in the presence of salt type solubilizing agents such as lithium salts and preferably with the aid of aliphatic chain terminators, in particular those having a cycloaliphatic structure, to produce elastomer solutions which are stable under processing conditions.Type: GrantFiled: September 21, 1990Date of Patent: February 4, 1992Assignee: Bayer AktiengesellschaftInventors: Beatrix Frauendorf, Carlhans Suling, Hans Rudolph, Siegfried Korte
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Patent number: 5061426Abstract: A process for the production of highly elastic elastane fibers (spandex fibers) based on segmented polyurethane (urea) elastomers having high elasticity and, at the same time, high strength values, balanced elastic properties and excellent thermal and hydrothermal behavior, wherein relatively high molecular weight, carbonate-linked, block-like polyester of polyester etherdiols having molecular weight of 3,300 to 7,000 are reacted with macrodiols with diisocyanates in a molecular ratio of 1:2.5 to 1:4.5 to obtain NCO prepolymers which have NCO contents of 2.10 to 4.0% NCO, then the NCO prepolymer is chain-extended with (cyclo)-aliphatic diamines to fom polyurethane (urea) elastomers.Type: GrantFiled: September 21, 1990Date of Patent: October 29, 1991Assignee: Bayer AktiengesellschaftInventors: Beatrix Frauendorf, Siegfried Korte, Carlhans Suling, Rudi Dauscher
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Patent number: 5030612Abstract: Thermal dye sublimation transfer recording element for receiving sublimable basic dye-precursors, comprising a support having thereon a dye-developing layer containing a dye-developing copolymer having sulfonic acid side-groups that can react with the basic dye-precursor to produce a dye image, characterized in that said dye-developing vinyl copolymer comprises plasticizing comonomers, the weight percentage of plasticizing comonomers in the dye-developing vinyl copolymer being such that the glass transition temperature of the dye-developing vinyl copolymer is between 30.degree. C. and 90.degree. C.Type: GrantFiled: February 27, 1990Date of Patent: July 9, 1991Assignee: Agfa-Gevaert, N.V.Inventors: Herman J. Uytterhoeven, Roderich Raue, Siegfried Korte