Patents Assigned to Wolff Walsrode AG
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Patent number: 6576348Abstract: A multilayer film having a lamination side and a heat-sealable side is described. The multilayer film comprises, a) an inner layer (i) ethylene/vinyl alcohol copolymer; b) a coupling agent layer (ii) and a separate coupling agent layer (ii′), said inner layer (i) being interposed between and in contact with each of said coupling agent layer (ii) and said separate coupling agent layer (ii′); c) at least one further layer (iii), said separate coupling agent layer (ii′) being interposed between and in contact with each of said inner layer (i) and said layer (iii); d) at least one layer (iv), said coupling agent layer (ii) being interposed between and in contact with each of said inner layer (i) and said layer (iv); and e) a heat-sealable layer (v), said layer (iv) being interposed between and in contact with each of said coupling agent layer (ii) and said heat-sealable layer (v). Layers (i), (ii), (ii′), (iii) and (v) of the multilayer film contain 0.1 to 3 wt.Type: GrantFiled: April 4, 2001Date of Patent: June 10, 2003Assignee: Wolff Walsrode AGInventors: Holger Eggers, Rudi Klein, Claudia Müller, Rainer Brandt
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Patent number: 6569538Abstract: A thermoformable, multi-layered, symmetric, coextruded film having no tendency to roll up, is described. The coextruded film contains layers of polyamide and polyolefin or copolymers based on olefins.Type: GrantFiled: January 3, 2001Date of Patent: May 27, 2003Assignee: Wolff Walsrode AGInventor: Gregor Kaschel
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Patent number: 6559300Abstract: A water-soluble, biodegradable hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester is disclosed. The hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester has: (i) a molecular degree of substitution of the hydroxyalkyl group of less than 1.5 (MShydroxyalkyl<1.5); and (ii) a molecular degree of substitution of the 2-hydroxycarboxylic acid group of greater than 0.4 and less than 3 (0.4<MS2-hydroxycarboxylic acid<3). Also described is a method of preparing the hydroxyalkyl cellulose-2-hydroxycarboxylic acid ester, and methods of using it, e.g., as a consistency regulator in at least one of foodstuffs, cosmetics, building materials, paints and strippers.Type: GrantFiled: January 11, 2000Date of Patent: May 6, 2003Assignee: Wolff Walsrode AGInventors: Joachim Simon, Hanns-Peter Müller, Rainhard Koch, Volkhard Müller, Jürgen Engelhardt, Klaus Szablikowski, Wolfgang Koch
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Patent number: 6558719Abstract: A foodstuffs skin based on cellulose with a water vapor impermeable layer on the outer surface and a coating consisting of at least two components on the inner surface is disclosed. The coating which reinforces adhesion to minced meat contains a cross-linked polyaminoamide/-epichlorhydrin resin, and wax as well as an optional synthetic polymer. A process for preparing these foodstuffs skins and their use for the production of sausages for boiling and/or simmering is also described.Type: GrantFiled: November 22, 2000Date of Patent: May 6, 2003Assignee: Wolff Walsrode AGInventors: Klaus Blumenberg, Willi Neuschulz
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Patent number: 6555242Abstract: A longitudinally stretched multilayered film having good barrier properties is described. The film is prepared by a process comprising (a) preparing by coextrusion a laminate structured of, in sequence, a first polyamide layer, an EVOH layer, and a second polyamide layer, and (b) longitudinally stretching the laminate and (c) applying by vacuum vapor deposition to one of the surfaces of the stretched laminate an inorganic layer.Type: GrantFiled: January 24, 2001Date of Patent: April 29, 2003Assignee: Wolff Walsrode AGInventors: Antoine Cassel, Rainer Brandt, Gregor Kaschel
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Patent number: 6541087Abstract: A multilayerd, biaxially stretched tubular film having the following sequence of layers, |A|B|C|D|E|F|G|, is described. Inner layer A contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Core layer E, consists essentially of at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Outer layer G contains at least one member selected from the group consisting of aliphatic (co)polyamide and partially aromatic (co)polyamide. Interlayer C is polyolefinic, has water vapor barrier properties, and is interposed between inner layer A and core layer E. Interlayer C is directly attached to layer A via coupling layer B and to layer E via coupling layer D. Coupling layers B and F each independently contain a modified polyolefin.Type: GrantFiled: September 11, 2000Date of Patent: April 1, 2003Assignee: Wolff Walsrode AGInventors: Dirk Pophusen, Nils Schröder
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Patent number: 6534171Abstract: Described is a heat sealable, multi-layer laminating film composed of at least six layers of thermoplastic polymers. The multi-layer laminating film has an inner layer of ethylene/vinyl alcohol copolymer (EVOH). Also described are packaging materials containing the multi-layer laminating film of the present invention.Type: GrantFiled: February 1, 2001Date of Patent: March 18, 2003Assignee: Wolff Walsrode AGInventors: Holger Eggers, Gregor Kaschel
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Patent number: 6524712Abstract: A multilayer film is described which has at least one first layer (1) of thermoplastic polyurethane, at least one second layer (2) of thermoplastic elastomer, and optionally a third layer (3) of thermoplastic polyurethane. The ratio of the water vapor permeability level of the first layer (1) to the water vapor permeability level of the second layer (2), of the multilayer film is at least two. When the optional third layer (3) is present in the multilayer film, the first and third layers enclose the second layer. Also described are filled articles (e.g., water beds and hot/cold pads), which are fabricated from the multilayer films of the present invention.Type: GrantFiled: April 4, 2001Date of Patent: February 25, 2003Assignee: Wolff Walsrode AGInventors: Ralf Schledjewski, Antoine Cassel, Rainer Brandt, Aileen Craig
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Patent number: 6517920Abstract: A multilayered, coextruded tubular biaxially stretched casing, having oxygen and water vapor barrier properties plus reduced adhesion to contents, e.g., foodstuffs, contained within the casing, is disclosed. The tubular casing has five layers in the order of A|B|C|D|E. Outer layer A, contains as its principal component at least one polyamide. Layer B has oxygen barrier properties, and may be composed of a substantially hydrolyzed copolymer of ethylene and vinyl acetate. The core layer C contains as its principal component at least one polyamide. Layer D contains a modified polyolefin. Inner layer E (i.e., the layer that is in contact with the contents of the tubular casing) is a water vapor barrier layer, that contains as its principal component at least one member selected from the group consisting of homopolyolefin and copolyolefin. The tubular casing is useful for encasing foodstuffs, such as pasty or liquid foodstuffs.Type: GrantFiled: September 11, 2000Date of Patent: February 11, 2003Assignee: Wolff Walsrode AGInventors: Nils Schröder, Detlef Wolf
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Patent number: 6509461Abstract: The present invention relates to a new, particularly economical process for producing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a carrier and heat exchange gas, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The particulate cellulose derivative is then separated from the heat exchange gas and carrier gas, and optionally dried. The mill drying and the particulate cellulose derivative product are influenced by establishing a specific water content in the swollen and/or dissolved cellulose derivative.Type: GrantFiled: February 16, 2001Date of Patent: January 21, 2003Assignee: Wolff Walsrode AGInventors: Hartwig Schlesiger, Martin Morning, Gunter Weber, René Kiesewetter, Rudolf Lelgemann
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Patent number: 6509396Abstract: An oil-in-water coating agent is described. The coating agent emulsion is prepared from a composition comprising: a) 5.0 to 50 wt. % of cellulose substance; b) 5.0 to 50 wt. % of at least one hydroxyl group-containing lacquer resin; c) 2.0 to 25 wt. % of at least one polyisocyanate having more than one free isocyanate group; d) 10.0 to 65 wt. % of water; e) 0.5 to 30 wt. % of plasticiser; f) 0.0 to 20 wt. % of emulsifier; and g) 0.0 to 45 wt. % of at least one organic solvent. The sum of components a) to g) of the composition is 100 wt. %, and the weight ratio of hydroxyl groups of the hydroxyl group-containing lacquer resin b) to NCO groups of the polyisocyanate c) is 1:0.05 to 1:5. Also described is a method of using the coating agent emulsion, and its application to the surface of materials, such as wood and metal.Type: GrantFiled: July 26, 2000Date of Patent: January 21, 2003Assignee: Wolff Walsrode AGInventors: Lutz Hoppe, Hans-Günter Poersch-Panke, Klaus Nachtkamp
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Patent number: 6503617Abstract: Described is a multilayer film laminate having at least three layers, and gas barrier properties. The multilayer film laminate comprises sequentially: (I) at least two first layers, each of the first layers (I) having, on one side only, a vapor deposited coating selected independently from the group consisting of aluminum, SiOx and a metal oxide of main group 2 or 3 of the periodic table of the elements; and (II) an exterior polyolefin heat sealing layer. Also described is a method of using the multilayer film laminate as a barrier film in vacuum insulation panels.Type: GrantFiled: May 14, 2001Date of Patent: January 7, 2003Assignee: Wolff Walsrode AGInventors: Sven Jacobsen, Christian Kuckertz, Rainer Brandt
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Patent number: 6489468Abstract: A regioselectively substituted member selected from the group consisting of oligo-saccharide ester and polysaccharide ester is disclosed. The ester has a partial average degree of substitution AS at the C2 position of its anhydroglucose unit of at least 90% relative to the total AS. Also disclosed is a method of producing the regioselectively substituted ester. The method entails reacting in the presence of a catalyst a dissolved or a highly swollen oligo-saccharide or polysaccharide with an esterification reagent.Type: GrantFiled: February 29, 2000Date of Patent: December 3, 2002Assignee: Wolff Walsrode AGInventors: Erik-Andreas Klohr, Wolfgang Koch, Dieter Klemm, René Dicke
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Patent number: 6482940Abstract: A cellulose ether that is predominantly substituted in the C3 position of the anhydroglucose unit of the cellulose is described. In an embodiment of the present invention, the partial degree of substitution in the C3 position of the cellulose ether is ≧60%, based on the total degree of substitution. Also described is a process for preparing the cellulose ether of the present invention. The process involves, reacting cellulose, dissolved in N-methylmorpholine-N-oxide monohydrate (NMMNO) and optionally other inert organic solvents, with alkylation reagents. The reaction takes place in the presence of: (i) an insoluble solid phase catalyst, e.g., solid ion exchange resins based on polystyrene having quaternary ammonium groups; (ii) stabilizers, e.g., propyl gallate; and (iii) optionally additional soluble co-catalysts, e.g., trimethylbenzylammonium hydroxide.Type: GrantFiled: December 30, 1999Date of Patent: November 19, 2002Assignee: Wolff Walsrode AGInventors: Erik-Andreas Klohr, Jörg Neubauer, Wolfgang Koch, Klaus Szablikowski, Detmar Redeker, Wolfgang Wagenknecht, Fritz Loth
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Patent number: 6455618Abstract: Described is a thermoplastic molding composition comprising: a) 0.05 to 1.5 wt. %, with respect to the entire molding composition, of a fatty acid amide ester wax; b) 0.5 to 10 wt. %, with respect to the entire molding composition, of a silica selected from natural silica, synthetic silica and mixtures thereof; c) 0 to 1 wt. %, with respect to the entire molding composition, of a montan wax; and d) at least one thermoplastic elastomer. Also described are a method of preparing the thermoplastic molding composition, and methods of preparing articles from the thermoplastic molding composition.Type: GrantFiled: June 7, 2001Date of Patent: September 24, 2002Assignee: Wolff Walsrode AGInventors: Ralf Schledjewski, Hans-Werner Funk, Dirk Schultze, Rainer Brandt
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Patent number: 6419995Abstract: Described is a process for the homogeneous surface activation of a material in web form, by means of plasma-treatment. The material in web form is selected from metallic materials in web form having a thickness of less than 100 &mgr;m, polymeric materials in web form and combinations thereof. The process involves treating homogeneously at least a portion of the surface of the material in web form, which is moved over at least one pair of rolls, with an atmospheric plasma, optionally in the presence of a process gas and/or a process aerosol. The atmospheric plasma is generated by an indirect plasmatron.Type: GrantFiled: March 6, 2001Date of Patent: July 16, 2002Assignee: Wolff Walsrode AGInventors: Christian Kuckertz, Sven Jacobsen, Rainer Brandt, Klaus Landes, Ralf Hartmann
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Patent number: 6407151Abstract: A cellulose substance-containing lacquer emulsion prepared from a) 5-50 wt. % of cellulose substance b) 5-50 wt. % of one or more hydroxyl group-containing lacquer resins c) 0.1-10 wt. % of polyisocyanates with more than one free isocyanate group d) 0.5-30 wt. % of plasticizer e) 0.0-20 wt. % of emulsifier f) 0.0-45 wt. % of at least one organic solvent g) 10-65 wt. % of water wherein the sum of a) to g) is always 100 wt. %, characterized in that the ratio by weight of OH groups (from the lacquer resin) to NCO groups is 1:0.01-1.0 is described.Type: GrantFiled: July 26, 2000Date of Patent: June 18, 2002Assignee: Wolff Walsrode AGInventors: Lutz Hoppe, Hans-Günter Poersch-Panke
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Patent number: 6403787Abstract: The present invention relates to evenly substituted polysaccharide derivatives having the general structure: polysaccharide—O—R wherein polysaccharide—O represents a substituted or unsubstituted polysaccharide unit and R is a substituent of a polysaccharide-OH group having either the structure R=—A—B— or the structure R=—B—, wherein A is a linear polyether chain having the following structure: A=(—D—O—)n wherein D denotes a linear aliphatic branched or unbranched chain having 2 to 12 C atoms, O represents an oxygen atom and n is a number equal to or greater than 1, and B represents a substituted carbamic acid having the structure wherein E denotes a linear or branched aliphatic chain having 1 to 18 C atoms.Type: GrantFiled: April 2, 1997Date of Patent: June 11, 2002Assignee: Wolff Walsrode AGInventors: Jürgen Engelhardt, Joachim Simon, Hanns-Peter Müller, Rainhard Koch, Dirk-Jacques Dijkstra
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Patent number: 6364363Abstract: An optionally laminated film of plastics is described, characterised in that the film is printed on one side with a security ink. A process for the production of such a film and the use thereof as a packaging material are also described.Type: GrantFiled: May 1, 2000Date of Patent: April 2, 2002Assignee: Wolff Walsrode AGInventors: Olaf Stöber, Christian Kuckertz, Adolf Ahrens
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Patent number: 6346321Abstract: A plastic film comprising a plastic resin having imprinted on one of its surfaces a microtyped marking is disclosed. The film, optionally in the form of a laminate with a film of polymeric material, paper or metal foil is useful as packaging material.Type: GrantFiled: May 1, 2000Date of Patent: February 12, 2002Assignee: Wolff Walsrode AGInventors: Olaf Stöber, Christian Kuckertz, Adolf Ahrens