Patents Assigned to Wolff Walsrode Aktiengesellschaft
  • Patent number: 6489038
    Abstract: A multi-layered film that may be heat laminated to a substrate is described. The multi-layered film comprises a base layer comprising polypropylene, a first external layer comprising polypropylene, and a second external layer. The base layer is interposed between the first and second external layers. The second external layer comprises a mixture of first (i) and second (ii) ethylene vinyl acetate (EVA) copolymers, each having different vinyl acetate residue contents. The content of vinyl acetate residues in the first EVA copolymer (i) is 10 to 30 percent by weight, based on the weight of the first copolymer (i), the content of vinyl acetate residues in the second EVA copolymer (ii) is 1 to 10 percent by weight, based on the weight of the second copolymer (ii). The multi-layered film is heat laminated and oriented at least monoaxially.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: December 3, 2002
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Bernd Sperlich, Willi Schwarz
  • Patent number: 6274246
    Abstract: A multi-layered laminate suitable for production of thermoformed packaging is disclosed. The laminate contains a polyamide-containing layer, a sealing layer and optionally an EVOH-containing layer and is characterized in that it contains water in an amount of 0.5 to 2.5 percent.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: August 14, 2001
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Holger Eggers, Gregor Kaschel, Andreas Gasse
  • Patent number: 5674600
    Abstract: The present invention relates to a film of at least two layers having at least one side softening at a lower temperature and at least one side softening at a higher temperature, wherein the higher-softening side substantially consists of a thermoplastic polyurethane which softens at above 100.degree. C. on a Kofler hot bench and the median of the softening range is at least 15.degree. C. above that of the lower-softening layer and the matrix component of the lower-softening side consists of at least one hot-bonding thermoplastic material from the group comprising polyamides, polyesters and polyurethanes having a median of the softening range on a Kofler hot bench of below 100.degree. C. and at least one additive component from the group comprisinga) additive masterbatches containing inorganic particles,b) additive masterbatches containing organic particleswith thermoplastic matrix resins is added to the lower-softening layer.
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: October 7, 1997
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Nicole Hargarter, Dirk Schultze, Reinhard Kunold
  • Patent number: 5665469
    Abstract: The present invention relates to an oriented, particularly a biaxially oriented, sealable, metallisable multilayer film, characterised in that it is built up as follows:ABCBDa) where C is the core layer comprising isotactic polypropylene with an MFI between 0.5 and 4.5 g/10 min,b) A is the base layer for vacuum evaporation, comprising 0.1-0.5% of an organic or inorganic spacer and 1 to 10% of an ethylene/octene copolymer with a density <0.915 g/cm.sup.3, and 89.5 to 98.9% of a heat-sealable propylene/ethylene copolymer with an ethylene content of 1 to 8%,c) B represents the two intermediate layers comprising a propylene homopolymer with an MFI between 2 and 12 g/10 min,d) and D is the sealable layer comprising an olefinic homo-, co- or terpolymer and 0.1 to 0.5% of an inorganic or organic spacer, or a mixture of the two classes of spacer. The film is desirably metallized with a metal or metal oxide layer.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: September 9, 1997
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Rainer Brandt, Ulrich Reiners
  • Patent number: 5639865
    Abstract: The present invention relates to novel thermoplastic, biodegradable polysaccharide ether esters, such as for example cellulose ether esters or starch ether esters, and to the production of such graft copolymers from polysaccharides, epoxides and dicarboxylic acid anhydrides and to the use thereof, for example as moldings, films or coatings.
    Type: Grant
    Filed: February 9, 1995
    Date of Patent: June 17, 1997
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Jochen Kalbe, Hanns-Peter Muller, Rainhard Koch, Jurgen Engelhardt, Wolfgang Koch, Klaus Szablikowski, Gunter Weber
  • Patent number: 5614616
    Abstract: Polysaccharides corresponding to formula (I) ##STR1## in which S is a recurrent monosaccharide unit andB is a group of formula (Ia) attached to the monosaccharide unit S by an O atom ##STR2## are prepared by reaction of polysaccharides with an alkyl halide corresponding to formula (II) ##STR3##
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: March 25, 1997
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Klaus Szablikowski, J orn Breckwoldt
  • Patent number: 5593775
    Abstract: A single-layered, plastic and elastic thermoplastic hot-melt adhesive film which does not have a separating layer, wherein it can be wound on and off a reel without the use of a supplementary separating material, is essentially free of antiblocking agents and/or lubricants and that the maximum of its thermoanalytically determined main melting peak is below 90.degree. C. and which is essentially formed from at least two olefin copolymers with polar comonomers A and B, wherein ethylene is preferably used as an olefinic monomer, and whose essential comonomers contain oxygen atoms and the essential oxygen-containing comonomers in the olefin copolymers A and B are not identical, wherein the total proportion of oxygen-containing comonomer in the total weight of polymer resin forming the film is between 18 wt. % and 40 wt. % and the proportion of oxygen-containing comonomers in copolymer A is at least 60 wt.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: January 14, 1997
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Nicole Hargarter, Dirk Schultze, Ulrich Reiners
  • Patent number: 5585471
    Abstract: A method for preparing a chloroethylglucopyranose which comprisesa) reacting glucose with from 2 to 10 times the molar amount of chloroethanol at from 100.degree. to 130.degree. C. in the absence of a catalyst, optionally removing water,b) further reacting the product of step (a) at 60.degree. to 90.degree. C. in the presence of an acidic catalyst for from 10 to 600 minutes andc) Separating therefrom the chloroethylglucopyranose.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: December 17, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Klaus Szablikowski, Martin Lohrie, Wolfgang Koch, Reinhard Langer, Hans-Josef Buysch
  • Patent number: 5565504
    Abstract: The present Application relates to an aqueous, reactive microgel dispersion, wherein the microgel particles have an average particle diameter of 0.01 to 1 .mu.m, are insoluble but are capable of swelling in the usual organic solvents, dry without additional film-forming agents to form uniform, transparent, reactive films, and have iodine numbers of 2 to 100.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: October 15, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
  • Patent number: 5539018
    Abstract: The present Application relates to a polymer dispersion comprising an aqueous continuous phase and dispersed particles, which consist of a polymerized, water-soluble, urethane-modified allyl ether polyester and polymerized monomers, wherein at least two polymerized monomers A and B together with a water-soluble urethane-modified allyl ether polyester constitute the dispersion particle and are produced according to the core-shell model (multiphase).
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: July 23, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Erhard L uhmann, Lutz Hoppe, Wolfgang Dannhorn, Hans-J urgen Juhl
  • Patent number: 5521004
    Abstract: The present invention relates to a stretched, multilayer, transparent film which is reflection-reduced on at least one side, consists predominantly of polypropylene and is very suitable as window film for envelopes.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: May 28, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Ulrich Reiners, Anton Krallmann, Neele Neelen, Helmut Kuhlenkamp
  • Patent number: 5512649
    Abstract: At least monoaxially stretched polypropylene film containing an antiblocking agent, wherein the antiblocking agent has a cuboid and/or cubic, preferably cubic, geometry with bevelled, i.e. chamfered, edges and is X-ray amorphous.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: April 30, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Hermann Hendrickson-Benkhoff, Dietrich Stockmeier, Ulrich Reiners
  • Patent number: 5510453
    Abstract: The invention relates to novel branched polyesters containing allyl groups, which polyesters are water-emulsifiable, and their use as raw materials for lacquers.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: April 23, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Wolfgang Dannhorn, Lutz Hoppe
  • Patent number: 5501905
    Abstract: This invention relates to matt, multilayered propylene films to which their matt appearance is imparted by a one-sided, coextruded layer of a polymer mixture.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: March 26, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Anton Krallmann, Thomas Blum, Ingo Schinkel
  • Patent number: 5487950
    Abstract: The invention relates to the lacquering of polar film substrates with a coating system consisting of several components, the single application of material resulting in a multilayer structure of the lacquer coat. The coating system is preferably aqueous and free from organohalogen and results in an improved barrier action of the films against water vapor.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: January 30, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Gunter Weber, Ulrich Reiners, Sebastian Meyer-Stork
  • Patent number: 5484826
    Abstract: The invention relates to free-flowing, quick-dissolving lacquer binder granules based on cellulose esters, more particularly cellulose nitrates, and to a process for their production.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: January 16, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Lutz Hoppe
  • Patent number: 5484903
    Abstract: The invention relates to a process for the production of carbonic acid esters of polysaccharides which is characterized in that polysaccharides are reacted with carbonic acid esters.
    Type: Grant
    Filed: September 8, 1992
    Date of Patent: January 16, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Klaus Szablikowski, Hans-Josef Buysch, Alexander Klausener
  • Patent number: 5468563
    Abstract: The present invention relates to a stretched, multilayer, transparent film which is reflection-reduced on at least one side, consists predominantly of polypropylene and is very suitable as window film for envelopes.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: November 21, 1995
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Ulrich Reiners, Anton Krallmann, Eberhard Albinus, Jurgen Bohner
  • Patent number: 5466794
    Abstract: The present invention relates to novel thermoplastic, water-insoluble cellulose hydroxyalkyl hydroxycarboxylic acid esters of the general structureCell--O--Rwhere Cell--O is the substituted OH group of a polymeric cellulose unit and R is either a monomeric and/or polymeric hydroxyalkylether hydroxycarboxylic acid ester of the structure X:X=--A--B--in which A is a linear polyether chain:A=(--D--O--).sub.nin which D signifies a linear aliphatic branched or unbranched chain with 2 to 11 C atoms and n is a whole number equal to or greater than 1, and B is a linear polyester chain: ##STR1## in which E signifies a linear aliphatic branched or unbranched chain with 2 to 5 C atoms and m is a whole number equal to or greater than 1, or R is equal to A or B or X and a combination thereof in any ratio, or R is equal to H (hydrogen) according to the degree of substitution per anhydroglucose unit (max. 3) with A, B or X, and a process for their production and use of these cellulose derivatives as biodegradable mouldings.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: November 14, 1995
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Jochen Kalbe, Hanns P. Muller, Rainhard Koch, Jurgen Engelhardt, Wolfgang Koch, Klaus Szablikowski, Gunter Weber
  • Patent number: 5466520
    Abstract: The invention relates to a white-opaque biaxially orientated multilayer film with good heat-sealing properties and with a paper-like appearance on at least one side, comprising an opaque core and at least one outer layer made of:10-15% by weight of an isotactic polypropylene having a density of 0.9-0.91 g/cm.sup.3 and a melt-flow index of 0.5 g/10 min to 8 g/10 min at 230.degree. C. under 21.2 N load (determined to DIN 53735),5-15% by weight of a low-density linear copolymer of ethylene, modified with rubber and with maleic acid anhydrite,40-80% by weight of a statistical propylene/ethylene copolymer with 2 to 6% by weight of ethylene or statistical terpolymers of propylene, ethylene and butylene with a comonomer content of <15% by weight and a butylene content of <7% by weight and5-15% by weight of an inorganic filler, preferably rutile-type titanium dioxide with an average diameter of 200 nm.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: November 14, 1995
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Anton Krallmann, Ulrich Reiners, Eberhard Albinus, Jurgen Bohner, Neele Neelen