Patents Assigned to EMS-Inventa AG
  • Patent number: 5656700
    Abstract: A process for preparing linear copolyesters which contain omega-hydrocarboxylic acid units, from polyesters that contain at least 90 mol % polyethylene terephthalate units, as well as the usual amount of diethylene glycol units and possibly the known catalysts and stabilizers, includes adding to the already prepared polyester melt at least one compound of the group of lactones, optionally along with further additives but without additional catalysts in a system sealed off from gas exchange and at a higher pressure than the lactone vapor pressure in a proportion of up to 10 mol %, referred to the final melt, and mixed intensively with the melt. The resultant copolyesters, after a total dwell time of less than 30 minutes and a temperature in the range of 265.degree. to 310.degree. C.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: August 12, 1997
    Assignee: EMS--INVENTA AG
    Inventors: Werner Kagi, Klaus Nothhelfer, Werner Stibal
  • Patent number: 5636875
    Abstract: A pipe connector for liquid-conducting conduits is made of polymers and comprises a core part and a sleeve part for receiving the core part. The core part and sleeve part are each adapted for spin-welding with a polymer conduit to form a permeation-tight connection of pipe conduits made of the same polymers. The core part and the sleeve part each have a cylindrical connection region for spin-welding which includes a cross-sectional narrowing and an annular groove.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: June 10, 1997
    Assignee: Ems-Inventa AG
    Inventor: Beat Wasser
  • Patent number: 5612446
    Abstract: The invention relates to a barrier layer resisting the transmission of oxygen for multi-layer barrier film characterized in that it is made of a transparent copolyamide comprising three components. The first component is hexamethylenediamine and adipic acid. The second component is hexamethylenediamine and azelaic acid, hexamethylenediamine and sebacic acid, and mixtures thereof. The third component is hexamethylene-diamine and isophthalic acid, hexamethylenediamine and terephthalic acid, and mixtures thereof. The total of all components is 100 mol %, and the ratio of the barrier effects in the barrier layer with respect to carbon dioxide and oxygen is at least 3:1.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: March 18, 1997
    Assignee: EMS-Inventa AG
    Inventors: Ulrich Presenz, Manfred Hewel
  • Patent number: 5601925
    Abstract: A penetration agent for elastomer reinforcement substrate contains at least one linear aliphatic monoglycide ether having at least 10 carbon atoms. Use of this penetration agent for producing elastomer-compatible reinforcement substrates avoids the use of volatile solvents and the problems associated therewith.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: February 11, 1997
    Assignee: EMS-Inventa AG
    Inventors: Gunter Kurz, Manfred Wenzler
  • Patent number: 5591495
    Abstract: Copolyamide barrier layers which are durable hot-water stable and transparent. The copolyamide is amorphous and partially aromatic, and comprises(a) 50 molar parts of substituted or unsubstituted aromatic dicarboxylic acids which are replaced by up to 60% by weight of at least one additional dicarboxylic acid selected from the group consisting of cycloaliphatic dicarboxylic acids having 8 to 24 carbon atoms, araliphatic dicarboxylic acids having 8 to 18 carbon atoms, and mixtures thereof, and (b) 50 molar parts of hexamethylene diamine, which is replaced by up to 60% by weight of at least one additional diamine, selected from the group consisting of substituted or unsubstituted aliphatic diamines having 4 to 20 carbon atoms, substituted cycloaliphatic diamines having 6 to 24 carbon atoms, araliphatic diamines having 8 to 18 carbon atoms, and mixtures thereof,the acid groups and amino groups being present substantially in equimolar proportions.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 7, 1997
    Assignee: EMS-INVENTA AG
    Inventors: Hans D. Torre, Manfred Hewel
  • Patent number: 5588468
    Abstract: A coolant conduit, which is an elongate tubular article for an apparatus requiring cooling by a cooling agent, includes a plurality of layers which are provided by, in combination, discharging a co-axial melt hose, 3D tubing manipulation, and blow molding thereof, each layer of the plurality being composed of a polymeric material which is thermoplastically processable. The plurality of layers preferably includes at least one inner layer which is composed of a polymeric material which is substantially inert to the cooling agent and which is substantially non-swelling; and an outer layer which is composed of at least one polyamide and which has a high pressure resistant which conveys a high bursting strength.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: December 31, 1996
    Assignee: EMS-Inventa AG
    Inventor: Wolfgang Pfleger
  • Patent number: 5560398
    Abstract: A coolant conduit which is an elongate tubular article for an apparatus requiring cooling by a cooling agent, such as an engine, for example, an internal combustion engine, includes a plurality of layers which are provided by sequential coextrusion thereof and which are adjoined thereby, each layer of the plurality being comprised of a polymeric material which is thermoplastically processable. The plurality of layers may include an inner layer which is composed of a polymeric material which is substantially inert to cooling agent and which is substantially non-swelling, and an outer layer which is composed of at least one polyamide and which is pressure resistant. The coolant conduit may include a plurality of longitudinal sections, and at least one layer of the plurality of layers may then be composed of a polymeric material which differs between longitudinal sections thereof as is made possible by sequential coextrusion thereof.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: October 1, 1996
    Assignee: EMS-INVENTA AG
    Inventor: Wolfgang Pfleger
  • Patent number: 5538759
    Abstract: A heat-curable, epoxy-free coating system of binder resin is based on a hydroxyl-terminated polyester resin (a) with a hydroxyl number of from 20 to 200 mg KOH/g and a glass transition temperature of at least 40.degree. C., a carboxyl-group-containing, reversibly blocked polyisocyanate (b) and a b-hydroxyalkylamide (c) having at least two b-hydroxyalkylamide groups per molecule, and optionally further additives dictated by the usage and processing.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: July 23, 1996
    Assignee: EMS-Inventa AG
    Inventors: Manfred Hoppe, Andreas Kaplan, Rene Gisler
  • Patent number: 5536157
    Abstract: The apparatus for cooling, stabilizing and preparing melt-spun filaments includes a spinneret assembly for producing an annular bundle of filaments; a blowing air dispensing device downstream of the spinneret assembly and centrally located in the annular bundle for cooling the melt-spun filaments; a hollow, air-conducting preparation application device located centrally in the annular bundle and downstream of the blowing air dispensing device; a radially closed hollow cylindrical tube having open ends and connecting the blowing air dispensing device and the preparation application device to conduct air flowing through the preparation application device to the blowing air dispensing device and having a length of from 200 to 2000 mm and a controlling device for regulating the spinning speed and filament denier so that the product of the spinning speed and the square root of the filament denier is between 5000 and 20000 (m/min dtex.sup.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: July 16, 1996
    Assignee: EMS-INVENTA AG.G.
    Inventor: Hans Linz
  • Patent number: 5516815
    Abstract: A starch fiber produced by a spinning process and comprising:A A first amount of 1 to 100 parts of a starch melt-spinnable composition comprising1. a second amount of 56 to 96 parts of at least one modified and/or unmodified starch,2. a third amount of 4 to 40 parts of at least one destructuring agent,3. a fourth amount of 0 to 4 parts of at least one additive, selected from urea, urea derivatives, emulsifiers, lubricants, and proteins and their alkali salts,components 1, 2 and 3 totaling 100 parts; andB a fifth amount of 99 to 0 parts of at least one melt-spinnable polymer,ingredients A and B totaling 100 parts.In addition, there may also be included 0 to 20 parts of conventional additives for melt spinning compositions.The invention further relates to a process for the production of these starch fibers from this melt spinning composition, and to uses for fibers which, by modification with the starch melt-spinnable composition, have special properties.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: May 14, 1996
    Assignee: EMS-Inventa AG
    Inventors: Friedrich Buehler, Viktor Baron, Eduard Schmid, Peter Meier, Hans-Joachim Schultze
  • Patent number: 5514790
    Abstract: A process for producing a starch intermediate product in which the reactive hydroxy groups are activated by swelling and disintegrating starch with dilute aqueous-alkali lye, precipitating the disintegrated starch from an aqueous-alkali solution by adding a precipitant which is miscible with water, separating the precipitated disintegrated starch, which exists in a highly activated form, from the filtrate producing a starch intermediate product, and drying the starch intermediate product. A starch intermediate product produced by this process results in a starch which exists in a highly activated form but which is stable in storage.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: May 7, 1996
    Assignee: EMS-Inventa AG
    Inventors: Rainer Frische, Bernd Best, Hermann Schomann, Heinz G. Hoff
  • Patent number: 5510073
    Abstract: A planetary gear for a multiple-screw extruder includes a circular stationary housing having internal teeth, a sun wheel formed from at least one toothed portion of a spindle, and a plurality of main planet wheels formed from at least one toothed free end of a plurality of screws and arranged in a circle. The plurality of main planet wheels are spaced from one another, from the sun wheel and from the internal housing teeth. A plurality of internal and external intermediate planet wheels are arranged between the sun wheel and the main planet wheels and between the main planet wheels and the internal housing teeth, respectively.
    Type: Grant
    Filed: April 13, 1994
    Date of Patent: April 23, 1996
    Assignee: Ems-Inventa AG
    Inventors: Werner Kaegi, Gerhard Schmidt, Joachim Ensinger
  • Patent number: 5498706
    Abstract: The present invention relates to water-resistant, thermoplastic starch materials processable into environmentally safe, thermoplastically produced products and cast sheets, which consist of starch acyl compounds, obtainable from high amylose starches and the derivatives thereof and being sparingly soluble in water, and of plasticizers which like ethyl citrate, glycerol acetate and lactic acid ester have a gelatinizing effect and preferably a dissolution property resulting in brilliant transparence and, as can be proved, are biodegradable.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: March 12, 1996
    Assignee: EMS Inventa AG
    Inventors: Rainer Frische, Renate Gross-Lannert, Klaus Wollmann, Bernd Best, Eduard Schmid, Fritz Buehler
  • Patent number: 5480923
    Abstract: A starch composition including destructurized starch, an acrylate copolymer having a molecular weight of more than 400,000, water, and additives such as plasticizers, lubricants, fillers, reinforcing agents, stabilizers, impact modifiers, and flame retardants. Also disclosed are a method of preparation thereof and articles produced therefrom. The compositions are readily usable on existing devices and can be thermoplastically processed substantially in accordance with methods currently in use.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: January 2, 1996
    Assignee: EMS-Inventa AG
    Inventors: Eduard Schmid, Friedrich S. Buehler, Hans-Joachim Schultze
  • Patent number: 5474109
    Abstract: A multilayer polymer hose or pipe conduit which contains at least one barrier layer of polyester, which acts as a barrier to fuel being carried thereby. In a preferred form of the invention, the hose or conduit has an inner polyamide protective layer, an outer polyamide protective layer, an adhesion promotor layer between the barrier layer and the inner protective layer, and another adhesion layer between the barrier layer and the outer protective layer.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: December 12, 1995
    Assignee: EMS-Inventa AG
    Inventors: Georg Stoeppelmann, Bernhard Zeh
  • Patent number: 5458478
    Abstract: A process and an apparatus for the direct, continuous and flexible modification of polymer melts by branching off a branch melt stream from the main melt stream to be modified, dispersing the initially introduced additive in the melt in a specially designed twin-screw extruder, and subsequent recycling of the additive melt concentrate to the melt stream to be modified.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: October 17, 1995
    Assignee: Ems-Inventa AG
    Inventors: Werner Stibal, Daniel Boni, Hans Luckert
  • Patent number: 5444120
    Abstract: Thermoplastically processable elastomeric block copolyetheresteretheramides from recurring units of the formula ##STR1## in which ##STR2## represents a polyamide segment containing terminal carboxyl groups and having an average molar mass of 700 to 10,000,--O--E--O-- is a poly-(oxytetramethylene)-segment having an average molar mass of 600 to 3,500,--NH--F--NH-- represents a poly-(oxy-1,2-propylene)-segment containing terminal amino groups and having an average molar mass of 350 to 2,500,x and y are integers from 3 to 35 and indicate the number of the respective, randomly arranged, recurring units, the ratio x:y of components A and B varying between 5:1 and 1:5.The ether amides of the present invention can optionally be mixed with additives, fillers, modifiers, or other compatible polymers normally used in tile processing of polyamides and which are suitable for the production of molded articles, for example by injection molding, coinjection, extrusion, blow molding, etc.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: August 22, 1995
    Assignee: EMS-Inventa AG
    Inventor: Hanns-Jorg Liedloff
  • Patent number: 5436078
    Abstract: A highly transparent, single-phase biodegradable starch mixture comprising 90 to 1 parts of at least one polyamide and 10 to 99 parts of a starch molding composition, which composition comprises 96 to 46 parts of at least one chemically modified starch and 4 to 40 parts of at least one plasticizer. Preferably, up to 4 parts by weight of at least one additive such as urea, urea derivatives, and emulsifiers are also included; in addition, the starch mixture may contain up to 20 parts by weight of known additives. The invention also relates to a process for producing the highly transparent starch mixture and, in particular, to the use of the starch mixture in thermoplastically shaped parts.
    Type: Grant
    Filed: October 6, 1992
    Date of Patent: July 25, 1995
    Assignee: EMS-Inventa AG
    Inventors: Friedrich S. Buhler, Eduard Schmid, Hans-Joachim Schultze
  • Patent number: 5430140
    Abstract: A process for producing a starch intermediate product in which the reactive hydroxy groups are activated by swelling and disintegrating starch with dilute aqueous-alkali lye, precipitating the disintegrated starch from an aqueous-alkali solution by adding a precipitant which is miscible with water, separating the precipitated disintegrated starch, which exists in a highly activated form, from the filtrate producing a starch intermediate product, and drying the starch intermediate product. A starch intermediate product produced by this process results in a starch which exists in a highly activated form but which is stable in storage.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: July 4, 1995
    Assignee: EMS-Inventa AG
    Inventors: Rainer Frische, Bernd Best, Hermann Schomann, Heinz G. Roff
  • Patent number: 5418068
    Abstract: A multi-layer composite made of at least one copolyamide protective layer, and at least one copolyamide barrier layer, with the protective layer placed such that it is between the barrier layer and a source of moisture. The protective copolyamide layer is composed of a partially aromatic, amorphous copolyamide of a specified composition, and the barrier layer is composed of a partially aromatic barrier copolyamide of a specified composition. This multi-layer composite is especially useful in reusable packaging systems, such as beverage bottles or containers of any kind.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: May 23, 1995
    Assignee: EMS-Inventa AG
    Inventors: Hans-Jorg Caluori, Hans-Dalla Torre, Manfred Hewel