Patents by Inventor Werner Prass

Werner Prass 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: 7585915
    Abstract: A description is given of an aqueous dispersion adhesive based on an aqueous polymer dispersion comprising at least one emulsion polymer with small amounts of crosslinkable N-methylol groups, at least one protective colloid, and at least one crosslinking agent containing N-methylol groups, of which at least one is etherified with an alkanol, said crosslinking agent being selected from the group consisting of hydroxymethylated cyclic ethyleneureas, hydroxymethylated cyclic propyleneureas, hydroxymethylated bicyclic glyoxal diureas, hydroxymethylated bicyclic malonaldehyde diureas or combinations thereof. The aqueous dispersion adhesive can be employed in particular for adhesively bonding porous and semiporous substrates.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: September 8, 2009
    Assignee: Celanese Emulsions GmbH
    Inventors: Martin Jakob, Werner Prass
  • Publication number: 20060257673
    Abstract: A description is given of laminates comprising sheetlike substrate and film joined to the substrate by means of an adhesive which comprises a polymer dispersion prepared by free-radical emulsion polymerization and an organosilane which is incorporated into the polymer during the polymerization and/or is added subsequently and which in addition to at least one silane group has at least one primary, secondary or tertiary amino group or at least one epoxide group or which comprises at least one ethylenically unsaturated group and at least one silane group. Through the addition of an organosilane it is possible to produce laminates which can be processed rapidly and which are distinguished by improved embossing strength.
    Type: Application
    Filed: May 13, 2006
    Publication date: November 16, 2006
    Applicant: Celanese Emulsions GmbH
    Inventors: Ulrich Desor, Werner Prass, Josef Reitspiess
  • Publication number: 20050032970
    Abstract: Water-resistant adhesives, their preparation and use A description is given of an aqueous dispersion adhesive based on an aqueous polymer dispersion comprising at least one emulsion polymer with small amounts of crosslinkable N-methylol groups, at least one protective colloid, and at least one crosslinking agent containing N-methylol groups, of which at least one is etherified with an alkanol, said crosslinking agent being selected from the group consisting of hydroxymethylated cyclic ethyleneureas, hydroxymethylated cyclic propyleneureas, hydroxymethylated bicyclic glyoxal diureas, hydroxymethylated bicyclic malonaldehyde diureas or combinations thereof. The aqueous dispersion adhesive can be employed in particular for adhesively bonding porous and semiporous substrates.
    Type: Application
    Filed: July 26, 2004
    Publication date: February 10, 2005
    Inventors: Martin Jakob, Werner Prass
  • Patent number: 6093766
    Abstract: The present invention relates to the preparation of heterogeneous, water-resistant polyvinyl ester dispersions having a film-forming temperature of below 10.degree. C., comprising the formation of a homo- or copolymer A, having a glass transistion temperature of more that 20.degree. C., by seed polymerization of a monomer mixture comprising 85-100% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms,0-10% by weight of an .alpha.,.beta.-unsaturated carboxylic acid and/or of an N-functional compound and0-5% by weight of a polyethylenically unsaturated monomer in the presence of a seed base comprising a copolymer B having a glass transition temperature of below 20.degree. C., comprising45-98% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms,2-50% by weight of an .alpha.-olefin having 1 to 4 carbon atoms and0-5% by weight of a polyethylenically unsaturated monomer.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: July 25, 2000
    Assignee: Clariant GmbH
    Inventors: Martin Jakob, Werner Prass
  • Patent number: 5948314
    Abstract: The invention relates to a composition comprising between 30 and 95% by volume of aerogel particles and at least one aqueous binder, where the particle diameter of the aerogel particles is less than 0.5 mm and the aerogel particles preferably have hydrophobic surface groups, a process for the preparation thereof, and the use thereof.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: September 7, 1999
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Geiss, Hans-Karl Muller, Werner Prass, Ude Scheunemann, Andreas Zimmermann
  • Patent number: 5817727
    Abstract: The present invention pertains to a film for detecting chemical substances comprising a homopolymer or a copolymer having recurring units represented by the following formula (I): ##STR1## wherein X is --H, --F, --Cl, --Br, --CH.sub.3, --CF.sub.3, --CN or --CH.sub.2 CH.sub.3 ; and R.sup.1 is --R.sup.2 or --Z--R.sup.2 ;wherein Z is --O--, --S--, --NH--, --NR.sup.2' --, --(C.dbd.Y)--, --(C.dbd.Y)--Y--, --Y--(C.dbd.Y)--, --(SO.sub.2)--, --Y'--(SO.sub.2)--, --(SO.sub.2)--Y'--, --Y'--(SO.sub.2)--Y'--, --NH--(C.dbd.O)--, --(C.dbd.O)--NH--, --(C.dbd.O)--NR.sup.2' --, --Y'--(C.dbd.Y)--Y'-- or --O--(C.dbd.O)--(CH.sub.2).sub.n --(C.dbd.O)--O--;wherein Y is independently O or S, and Y' is independently O or NH, and n is an integer of 0 to 20;and wherein R.sup.2 and R.sup.2' represent independently a hydrogen atom, a linear alkyl group, a branched alkyl group, a cycloalkyl group, an unsaturated hydrocarbon group, an aryl group, a saturated or unsaturated hetero ring or derivatives thereof, provided that R.sup.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 6, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Tetsu Yamamoto, Akihiko Tokida, Kenji Motosugi
  • Patent number: 5665844
    Abstract: The present invention pertains to a film for detecting chemical substances comprising a homopolymer or a copolymer having recurring units represented by the following formula (I): ##STR1## wherein X is --H, --F, --Cl, --Br, --CH.sub.3, --CF.sub.3, --CN or --CH.sub.2 CH.sub.3 ; and R.sup.1 is --R.sup.2 or --Z--R.sup.2 ;wherein Z is --O--, --S--, --NH--, --NR.sup.2' --, --(C.dbd.Y)--, --(C.dbd.Y)--Y--, --Y--(C.dbd.Y)--, --(SO.sub.2)--, --Y'--(SO.sub.2)--, --(SO.sub.2)--Y'--, --Y'--(SO.sub.2)--Y'--, --NH--(C.dbd.O)--, --(C.dbd.O)--NH--, --(C.dbd.O)--NR.sup.2' --, --Y'--(C.dbd.Y)--Y'-- or --O--(C.dbd.O)--(CH.sub.2).sub.n --(C.dbd.O)--O--;wherein Y is independently O or S, and Y' is independently O or NH, and n is an integer of 0 to 20;and wherein R.sup.2 and R.sup.2' represent independently a hydrogen atom, a linear alkyl group, a branched alkyl group, a cycloalkyl group, an unsaturated hydrocarbon group, an aryl group, a saturated or unsaturated hetero ring or derivatives thereof, provided that R.sup.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: September 9, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Tetsu Yamamoto, Akihiko Tokida, Kenji Motosugi
  • Patent number: 5658669
    Abstract: A composite membrane comprises a porous carrier membrane (A) and a fluorine-containing permselective layer (C) which is a copolymer and has a thickness of 10 to 500 nm. The copolymer of layer (C) comprisesa) 10 to 80 mol % of monomer units of a vinyl ester of the formula (I) ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are hydrogen, alkyl radicals, cycloalkyl radicals or aryl radicals, and these radicals together have at least 5 and not more than 30 carbon atoms,b1) 5 to 50 mol % of monomer units of a vinyl alcohol of the formula (II) ##STR2## in which R.sup.4 is the hydroxyl group and up to 10% of the groups R.sup.4 can be replaced by radicals of the formula OCOR.sup.5, in which R.sup.5 is methyl, ethyl or propyl, orb2) 5 to 50 mol % of monomer units of the formula (III) ##STR3## in which R.sup.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: August 19, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Olaf Althoff, Uwe Falk, Ude Scheunemann, Werner Prass, Werner Hickel
  • Patent number: 5640234
    Abstract: Disclosed and claimed is an optical sensor for the detection of chemical species. The optical sensor includes an optical waveguide having a guiding thin film. The thickness of the refrative index of the guiding thin film changes due to adsorption or absorption of the chemical species or reaction of the chemical species with the guiding thin film. The thickness of the guiding thin film is above the cutoff thickness in the presence of gaseous or liquid chemical species to be detected. And, the thickness of the guiding thin film is below the cutoff thickness in the absence of such chemical species.
    Type: Grant
    Filed: November 7, 1995
    Date of Patent: June 17, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Christoph Roth, Yuan Liu, Werner Prass, Tetsu Yamamoto, Kenji Motosugi
  • Patent number: 5563707
    Abstract: An optical sensor for detecting gaseous or liquid chemical species including a sensing element having a flat light reflecting substrate and one or more transparent thin films which are organic or inorganic films or high-polymer films and are formed on the substrate. The detection of the gaseous or liquid chemical species is effected by measuring a change in the light reflection characteristic of the sensing element based on swelling of the thin film or a change in its thickness or refractive index or changes in both parameters.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: October 8, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Prass, Thomas Stehlin, Yuan Liu, Shizuo Ogura, Kenji Motosugi, Akihiko Tokida, Tetsu Yamamoto
  • Patent number: 5429842
    Abstract: In order to continuously produce an ultrathin, ordered layer of amphiphilic molecules on the surface of a polar liquid a directed flow of the polar liquid is produced in a duct which contains the amphiphilic molecules in dissolved or undissolved form on the surface in spread form. In the duct, a duct section having a relatively high flow rate on the surface and comprising a ramp which is arranged at the bottom of the duct and washed over by the polar liquid is provided. This is followed by a duct section having a relatively low flow rate on the surface, in which the flow is dammed up at an obstacle at a liquid level constant with time, so that an ultrathin, ordered layer of amphiphilic molecules is continuously formed in these duct sections at the polar liquid/air interface by compression of the flow. The washed over ramp is movable.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: July 4, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunther Appel, Jacqueline Bauer, Werner Hickel, Donald Lupo, Werner Prass, Ude Scheunemann
  • Patent number: 5342432
    Abstract: Composite membrane, process for its production and its useA composite membrane for gas separation having a three-layer structure, constructed fromA) a supporting membrane layer made of porous polymer,B) a nonporous, gas-permeable intermediate layer,C) a permselective layer of regularly arranged organic molecules having a layer thickness of 3 to 100 nm,the layers (A) and (C) enclosing the intermediate layer (B), wherein the permselective layer (C) is constructed from regularly arranged amphiphilic molecules which contain one or two alkyl chains each having 7 to 25 carbon atoms per polar hydrophilic group.
    Type: Grant
    Filed: July 2, 1994
    Date of Patent: August 30, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Michael Haubs, Werner Prass
  • Patent number: 5258262
    Abstract: Radiation-sensitive film composed of at least one monomolecular layer of fluorine-containing amphiphiles. If a vinyl monomer containing fluoroalkyl side groups is copolymerized with a vinyl monomer containing oxirane groups, an amphiphilic polymer is obtained. To prepare a sandwich, a polymer is dissolved in a volatile organic solvent which is immiscible with water, the solution is spread on the water/air boundary surface, the resultant layer is compressed after the solvent has evaporated and transferred to a solid layer support by the Langmuir-Blodgett technique. The oxirane rings are cleaved and the film crosslinked by the action of high-energy radiation on the film.
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: November 2, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Christian Erdelen, Helmut Ringsdorf, Werner Prass, Ude Scheunemann
  • Patent number: 5256749
    Abstract: Amphiphilic copolymers containing silanyl groups and composed of derivatives of acrylic and/or methacrylic acid are described, which copolymers are suitable for the production of layer elements by the Langmuir-Blodgett method. Layer elements of this type can be used for optical waveguide systems and for the production of optical filters and for lithographic purposes.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: October 26, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Hickel, Donald Lupo, Werner Prass, Ude Scheunemann, Peter Wilharm
  • Patent number: 5166307
    Abstract: Polyamides of the general formula [N(A)-X-N(B)-CO-Y-CO-].sub.n are described, in which Y denotes a divalent group, X a divalent radical whose chain contains at least two carbon atoms, A and B independently of one another denote H or a C.sub.1 to C.sub.26 alkyl group and n denotes an integer greater than 4. The said polyamides contain at least one alkyl group of C.sub.6 to C.sub.26 per repeating unit. The groups X and/or Y contain at leat one CH.sub.2 group in the chain. The polyamides are prepared by reaction of a diamine of the formula NHA-X-NHB with an about equimolar amount of a reactive derivative of a dicarboxylic acid of the formula COOH-Y-COOH. The polyamides obtained can be used in order to prepare highly ordered monomolecular LB films on a support. For this purpose, the polyamide is dissolved in a volatile organic solvent which is immiscible with water and the solution is spread on the water/air interface.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: November 24, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Harald Cherdron, Werner Prass, Ude Scheunemann, Donald Lupo
  • Patent number: 5120809
    Abstract: Amphiphilic monomers with mixed-chain structures of the formula ##STR1## in which Y denotes --O-- or --NH--X denotes a group of the formula --(CH.sub.2).sub.n -- or --(CH.sub.2 --O--CH.sub.2).sub.n --l denotes an integer from 0 to 10,n denotes an integer from 1 to 10,R.sup.1 denotes hydrogen, methyl, chlorine, cyano, fluorine or bromine,R.sup.2 denotes C.sub.1 -C.sub.24 -alkyl or C.sub.1 -C.sub.24 -fluoroalkyl andR.sup.3 denotes C.sub.8 -C.sub.24 -alkyl or C.sub.8 -C.sub.24 -fluoralkyl, with the proviso that the groups R.sup.2 and R.sup.3 contain a different number of carbon atoms. The monomers are polymerized on their own or together with other comonomers. The polymers obtained are suitable for the preparation of ultra-thin layers on a suitable layer support.
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: June 9, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Donald Lupo, Werner Prass, Ude Scheunemann
  • Patent number: 5116925
    Abstract: Amphiphilic monomers having mixed-chain structures of the general formulae (I) or (II) ##STR1## where Y is --O-- or --NH--,X is a group of the formula --(CH.sub.2).sub.n -- or --(CH.sub.2 --O--CH.sub.2).sub.n --,l is an integer from 0 to 10,m is an integer from 10 to 26,n is an integer from 1 to 10,R.sup.1 is hydrogen, methyl, chlorine, cyano, fluorine or bromine, andR.sup.2 is O-alkyl or NH-alkyl,are polymerized alone or together with other comonomers. The polymers obtained are suitable for preparing ultra-thin films on a suitable base material.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: May 26, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Donald Lupo, Werner Prass, Ude Scheunemann
  • Patent number: 5081212
    Abstract: A polyurea of the general formula ##STR1## where X and Y are. independently of one another, a divalent radical whose chain contains in each case at least two carbon atoms, and A and B are, independently of one another, H or (C.sub.1 -C.sub.26)alkyl, and n is an integer greater than 4, which polyurea contains at least one (C.sub.6 -C.sub.26) alkyl group per repeating unit, is prepared by reacting the diamine NHA-X-NHB with roughly the equimolar amount of a diisocyanate OCN-Y-NCO. The polyurea is suitable for preparing ordered monomolecular LB films on a base (film-substrate-system). For this purpose it is dissolved in a volatile organic solvent which is not miscible with water, the solution is spread at the water/air interface, and the layer formed is compressed after the solvent has evaporated and it is transferred to a solid layer base by the Langmuir-Blodgett technique.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: January 14, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Prass, Ude Scheunemann
  • Patent number: 5034277
    Abstract: A film for use in nonlinear optics comprises at least one Langmuir-Blodgett layer, the layer containing or comprising a dye of the formula ##STR1## in which R.sup.1 denotes a long-chain alkoxy, acyloxy, alkylamino or acylamino group. In particular when the film contains alternating layers of unsaturated amphiphilic compounds, it produces a stable multilayer having good nonlinear optical properties and is suitable, for example, for electrooptical switches, diode laser frequency amplifiers or optical parametric amplifiers.Besides the dye indicated, the unimolecular layer can additionally contain at least one second amphiphilic compound. In this case, the unimolecular layer comprises amphiphilic compounds.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: July 23, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Andre Laschewsky, Helmut Ringsdorf, Werner Interthal, Donald Lupo, Werner Prass, Ude Scheunemann
  • Patent number: 4988606
    Abstract: A negative-working radiation-sensitive mixture comprising a binder and a polymer containing 1,2,3-thiadiazole groups is disclosed. The binder is a polyfunctional compound having functional groups that react with ketene. The polymer is a compound obtained by polymerization of a compound of the general formula I ##STR1## in which R is a polymerizable group. If the polymer is a copolymer containing comonomers having functional groups capable of reacting with ketene, the binder can be omitted. The negative-working radiation-sensitive mixture is particularly suitable for UV, electron beam and X-ray lithography.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: January 29, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Werner Prass, Rudolf Zertani, Juergen Lingnau, Norbert Hanold