Patents Assigned to Wolff Walsrode AG
  • Patent number: 5750262
    Abstract: Heat-sealable composite film having good surface slip with very good thermoforming properties based on polyamide and polyolefins, wherein the film consists ofat least one layer of aliphatic polyamide (A) andat least one layer of a polymer blend (B) consisting of 10-60 wt. % of amorphous polyamide and 40-90% of aliphatic polyamide andat least one thermoplastic heat sealing layer (C) andat least one bonding layer (D),arranged in such a manner that a heat sealing layer and a layer of aliphatic polyamide are located on the outer sides of the film, and wherein the film is not stretched.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: May 12, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Andreas Gasse, Rudi Klein
  • Patent number: 5747124
    Abstract: An at least 4-layer co-extruded, biaxially stretched, tubular seamless casing for sausages to be heated in water and cooking-sausages, having improved tearing properties in the filled state associated with a decreased tendency to burst open when the sausage product is first cut, containing at least two layers composed predominantly of aliphatic polyamide, which form the inner and outer surfaces of the tube, and at least two additional layers, which are enclosed by the inner and outer polyamide layers, with at least one of the enclosed layers acting as a water vapor barrier and having the structure of a polyolefin and at least one other of the enclosed layers acting as an oxygen barrier and consisting mainly of ethylene vinyl alcohol copolymers, the quotient of the tear resistance in the transverse direction to the tear resistance in the longitudinal direction lying between about 0.65 and 0.85, with the degree of surface stretching of the film product being between 8 and 11.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: May 5, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Dirk Pophusen, Michael Hennig Cardinal von Widdern
  • Patent number: 5717087
    Abstract: The present invention relates to thermoplastic and biodegradable polysaccharide esters/polysaccharide ether esters, which are characterised in that they can be represented by the general structure ##STR1## wherein Polysaccharide-O represents the substituted OH groups of a polymeric saccharide unit and wherein A is a linear polyether chain of the following structureA=(E--O)nwherein E signifies a linear aliphatic or aromatic branched or unbranched chain having 2 to 11 C atoms, n is an integer equal to or greater than 0 and both B and D are a maleic acid addition product of the following structure ##STR2## wherein F is an aliphatic, saturated, monounsaturated or polyunsaturated carbon skeleton, which may optionally be provided with further substituents and wherein C can be a hydrogen atom, one or more substituents from the group dihydroxyethyl, hydroxypropyl, hydroxybutyl, methyl, ethyl, benzyl, dihydroxypropyl, carboxyalkyl, sulphoalkyl or cyanoethyl.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: February 10, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Jochen Kalbe, Reinhard Koch, Hanns Peter Muller, Jurgen Engelhardt, Wolfgang Koch, Volkhard Muller
  • Patent number: 5711793
    Abstract: Lacquer vehicles in granular form, wherein the lacquer vehicles in granular form are composed of 10-82 weight % cellulose ester and 18-90 weight % resin and/or plasticizer as an explosive stabilizer.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: January 27, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
  • Patent number: 5684081
    Abstract: The present invention relates to polyester acrylate/urethane dispersions based on polyester acrylate prepolymers containing hydroxyl groups, obtainable by polyaddition ofA. 40-90 wt. % of one or more polyester acrylate prepolymers containing hydroxyl groups and having an OH content of 40-120 mg of KOH/g andB. 0.1-20 wt. % of one or more mono- and/or difunctional compounds reactive towards isocyanate groups, which compounds contain groups which are cationic, artionic and/or have a dispersant action due to ether groups withC. 10-50 wt. % of one or more polyisocyanatesD. 0.0-30 wt. % of polyolstogether with a subsequent reaction withE. 0.1-10 wt. % of one or more di- and/or polyamines.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: November 4, 1997
    Assignee: Wolff Walsrode AG
    Inventors: Wolfgang Dannhorn, Reinhold Hecht, Lutz Hoppe, Erhard Luhmann
  • Patent number: 5425990
    Abstract: The invention relates to matt-effect multilayer polypropylene films which acquire their matt appearance from at least one-sided, coextruded layer of a polymer mixture.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: June 20, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Thomas Blum, Ingo Schinkel, Anton Krallmann
  • Patent number: 5405664
    Abstract: This invention relates to a multilayer organochlorine-free tubular casing consiting ofa. a regenerated cellulose substrate,b. optionally a layer of primer,c. a 5 to 40 .mu.m thick, organochlorine-free polymeric water vapor barrier layer which is characterized in that it has a permeability to water vapor of at most 50 g/m.sup.2.24 h and a surface tension.ltoreq.34 mN/m,d. a 5 to 40 .mu.m thick, polymeric organochlorine-free oxygen barrier layer, characterized in that it has a permeability to oxygen of at most 120 cm.sup.3 /m.sup.2.24 h bar and a surface tension of.gtoreq.38 N/m.The invention also relates to its use as a casing for sausages of the Kochwurst and Bruhwurst type.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: April 11, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Kirkor Sirinyan, Hanns-Peter Muller, Rolf Dhein, Gunter Weber, Sebastian Meyer-Stork, Michael Stiem
  • Patent number: 5395681
    Abstract: The present invention relates to a multilayered polyurethane film and the utilization thereof as packaging material for photosensitive, in particular photographic material.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: March 7, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Nicole Hargarter, Gunter Weber
  • Patent number: 5393845
    Abstract: 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: Grant
    Filed: December 16, 1993
    Date of Patent: February 28, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Siegfried Korte, Heinrich Alberts, Branislav Bohmer, Werner Karstens, Wolfgang Koch, Hans-Gunter Poersch-Panke, Klaus Szablikowski
  • Patent number: 5385585
    Abstract: The present invention relates to the use of anionic alkyl cellulose mixed ethers, preferably alkyl carboxy-methyl cellulose mixed ethers and, more preferably methyl carboxymethyl cellulose mixed ethers (MCMC), as auxiliaries in the textile industry and preferably as thickeners for textile printing pastes.
    Type: Grant
    Filed: January 27, 1993
    Date of Patent: January 31, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Rene Kiesewetter, Eugen Reinhardt, Reinhard Kniewske, Klaus Szablikowski
  • Patent number: 5385607
    Abstract: The invention relates to a new class of water-soluble ionic cellulose derivatives and their use as additive for gypsum- and cement-containing compounds.
    Type: Grant
    Filed: January 27, 1993
    Date of Patent: January 31, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Rene Kiesewetter, Klaus Szablikowski, Werner Lange
  • Patent number: 5378826
    Abstract: The present invention relates to a process for the preparation of nitrocellulose having particular properties by compression by means of contrarotating rollers.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: January 3, 1995
    Assignee: Wolff Walsrode AG
    Inventors: Lutz Hoppe, Bernd Haase, Oke Brauer, Klaus Szablikowski
  • Patent number: 5362313
    Abstract: This invention relates to a new solid lacquer binder comprising gelatinized nitrocellulose, useful for the preparation of blocking-resistant coating compositions comprising epoxidized natural fatty acids of epoxidized triglycerides.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 8, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Lutz Hoppe, Burkhard Kressdorf, Erhard Luhmann, Reinhard Nader
  • Patent number: 5360902
    Abstract: The present invention relates to a process for producing methyl hydroxyalkyl cellulose ethers by alkalisation and etherification of celluloses, rinsing the methyl hydroxyalkyl cellulose ethers with water at higher temperatures and recovering the short-chain cellulose ethers that are soluble in the wash water, wherein the wash water containing sodium chloride and organic by-products is passed across a first stage of a membrane filtration having a molecular cut size of 200 to 150,000 Dalton, is concentrated during this process and passes across a second stage of a membrane filtration.
    Type: Grant
    Filed: December 15, 1992
    Date of Patent: November 1, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Oke Brauer, Bernd Haase, Dieter Herzog, Lutz Riechardt, Gerd Sonnenberg, Dietrich Tegtmeier
  • Patent number: 5356676
    Abstract: This invention relates to a coextruded, biaxially stretched tubular film for durable and crease-free wrapping of goods packaged in a liquid or pasty state, in particular foodstuffs such as sausage meat for boiling or cooking and cream cheese, which are heated treated during and/or after the packaging process.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: October 18, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Michael H.-C. von Widdern, Gunter Weber
  • Patent number: 5324776
    Abstract: The present invention relates to a process for the preparation of polymers containing amino groups, wherein OH-functional polymers are reacted with aminourethanes of the general formula I ##STR1## in which R represents C.sub.1 -C.sub.6 alkyl, C.sub.5 and C.sub.6 cycloalkyl, benzyl, 2-hydroxyethyl, 2-hydroxypropyl, aryl,R.sup.1 and R.sup.2 are identical or different and have the same meaning as R, and in addition cyanoethyl, or together with the N atom represent a 5- or 6-membered ring, optionally with a further N or O atom, and n is an integer from 0 to 12.
    Type: Grant
    Filed: February 11, 1993
    Date of Patent: June 28, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Hans-Josef Buysch, Klaus Szablikowski
  • Patent number: 5324777
    Abstract: The invention relates to a process for the production of polymers containing ammonium groups in which OH-functional polymers are first reacted with isocyanates corresponding to general formula IOCN--R--CH.sub.2 --X Iin which R represents C.sub.2-11 alkylene or arylene and X represents halogen, to form urethanes and the urethanes are subsequently reacted with tertiary aliphatic amines corresponding to formula II ##STR1## in which R.sup.1 to R.sup.3 may be the same or different.
    Type: Grant
    Filed: February 11, 1993
    Date of Patent: June 28, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Hans-Josef Buysch, Dieter Arlt, Klaus Szablikowski
  • Patent number: 5310849
    Abstract: The present invention relates to new amino and ammonium isocyanates, to a process for their preparation, e.g. by the reaction of certain ureas with isocyanates, and to the use of the new substances for the production of polymers containing ammonium groups.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: May 10, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Hans-Josef Buysch, Klaus Konig, Alexander Klausener, Klaus Szablikowski, Jorn Breckwoldt
  • Patent number: 5294702
    Abstract: This invention relates to water-soluble polymerisable 3-allyloxy-2-hydroxypropylethers of cellulose and to a process for their preparation.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: March 15, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Jorn Breckwoldt, Klaus Szablikowski
  • Patent number: 5274067
    Abstract: Unsaturated polyester polyurethanes based on an allyl-ether-modified polyester A and a polyisocyanate B are suitable for paints having improved hardness and appearance.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: December 28, 1993
    Assignee: Wolff Walsrode AG
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Lutz Hoppe, Wolfgang Koch, Klaus Szablikowski