Patents by Inventor Guenther Crass

Guenther Crass 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).

  • Publication number: 20010018476
    Abstract: The present invention relates to a transparent, low-flammability, UV-resistant, oriented film made from a crystallizable thermoplastic and having a thickness of from 5 to 300 &mgr;m. The film comprises at least one UV stabilizer and at least one flame retardant, and at least the flame retardant, and preferably also the UV stabilizer, is fed directly as a masterbatch to the crystallizable thermoplastic during production of the film. The film may have one or more layers, and the UV stabilizer may have been selected from the group consisting of the 2-hydroxybenzophenones, the 2-hydroxybenzotriazoles, the organonickel compounds, the salicylic esters, the cinnamic ester derivatives, the resorcinol monobenzoates, the oxanilides, the hydroxybenzoic esters, the sterically hindered amines and triazines, and the flame retardant may be an organic phosphorus compound, in particular an organic phosphorus compound soluble in polyethylene terephthalate.
    Type: Application
    Filed: January 12, 2001
    Publication date: August 30, 2001
    Inventors: Ursula Murschall, Ulrich Kern, Guenther Crass, Andreas Stopp
  • Patent number: 6200511
    Abstract: The application discloses a transparent, biaxially oriented polyester film having a base layer at least 80% by weight of which is composed of a thermoplastic polyester, and having at least one outer layer, wherein the outer layer is composed of a copolymer or of a mixture of polymers which comprises at least 35 mol % of ethylene 2,6-naphthalate units, up to 44 mol % of ethylene terephthalate units, and from 1 to 20 mol % of ethylene isophthalate units, and also up to 20 mol % of a sulfo-substituted dicarboxylic acid and, if desired, up to 10 mol % of units from aliphatic, including cycloaliphatic, or aromatic diols and/or dicarboxylic acids (based in each case on the total content of dicarboxylic acid or diol).
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: March 13, 2001
    Assignee: Mitsubishi Polyester Film GmbH
    Inventors: Herbert Peiffer, Cynthia Bennett, Guenther Crass, Gottfried Hilkert, Werner Roth
  • Patent number: 6149995
    Abstract: The application discloses a transparent biaxially oriented polyester film having a base layer, at least 80% by weight of which is composed of a thermoplastic polyester, and having at least one outer layer, wherein the outer layer is composed of a polymer or a mixture of polymers which comprises at least 40% by weight of ethylene 2,6-naphthalate units and up to 60% by weight of ethylene terephthalate units and/or of units from aliphatic, including cycloaliphatic, or aromatic diols and/or dicarboxylic acids, with the proviso that the T.sub.g 2 value of the polyester film is above the T.sub.g 2 value of the base layer but below the T.sub.g 2 value of the outer layer, and the base layer comprises particles. The film has low oxygen transmission. It is particularly suitable for packaging applications, specifically for packaging foods and other consumable items, or as a can liner, a lid film or a thermo-transfer ribbon.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: November 21, 2000
    Assignee: Mitsubishi Polyester Film GmbH
    Inventors: Herbert Peiffer, Cynthia Bennett, Guenther Crass, Gottfried Hilkert, Werner Roth
  • Patent number: 5288437
    Abstract: A process is described to produce ultra thin biaxially stretched film made of thermoplastic where at least two film webs are superimposed and stretched together in both the longitudinal and transverse directions. The film webs are subjected to a heat treatment before the first draw step. After stretching, the film webs are separated again from each other.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: February 22, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Guenther Crass, Siegfried Janocha, Gisbert Bammert
  • Patent number: 5234733
    Abstract: A shrink film which is comprised of a plurality of polyolefinic layers is disclosed. The base layer comprises polypropylene and a hydrogenated hydrocarbon resin admixture, and the top layers on each side of the base layer comprise polyolefinic sealable raw materials. The film possesses a shrinkability of more than 15% in the transverse direction and of less than 6% in the longitudinal direction, both measured at 90.degree. C. Also disclosed is a process for manufacturing the film comprising coextrusion followed by stretching of the film in the longitudinal and transverse directions, whereby stretching in the longitudinal direction is performed such that the double refraction value .DELTA.n of the longitudinally oriented film is not greater than 15.times.10.sup.-3.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: August 10, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Schloegl, Herbert Peiffer, Ursula Murschall, Lothar Bothe, Guenther Crass
  • Patent number: 5229140
    Abstract: A device for smoothing out the thickness of a sheet of thermoplastic material which includes a sheet die and a heating device which is integrated with the upper die lip of the sheet die. The heating device includes a hollow box filled with a liquid and a bar which projects laterally beyond the endfaces of the hollow box. The inlet and outlet openings of the bar in the hollow box are sealed. Arranged on the underside of the bar are small hot plates which are electrically heated. The liquid in the hollow box serves as a heat transfer medium and typically is an oil having a boiling point higher than 280.degree. C.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: July 20, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Guenther Crass, Siegfried Janocha, Harald Mueller
  • Patent number: 5219002
    Abstract: A multi-layered tubular synthetic sausage casing which includes an outer polyamide layer, an inner polyolefin layer and an intermediate layer for mutually bonding the inner and outer layers. The inner polyolefin layer includes a copolymer comprised of units of ethylene, propylene or straight-chain alpha-olefins having 4 to 8 carbon atoms, or of a mixture of these copolymers. In a preferred embodiment, the polyolefin layer is comprised of an ethylene/propylene/butylene terpolymer and/or of a propylene/butylene copolymer.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: June 15, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Stenger, Guenther Crass, Dieter Beissel
  • Patent number: 5200123
    Abstract: The invention relates to the production of ultra thin films. This process involves the biaxial stretching of at least two films wherein the joining of these films has been improved by electric corona discharge treatment.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: April 6, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Guenther Crass
  • Patent number: 5175051
    Abstract: The biaxially oriented film based on a propylene polymer contains an inorganic particulate neutralizing agent, in particular a carbonate or magnesium oxide. To improve the slip properties, the particles have been given a hydrophobic coating, in particular a coating of wax, a fatty acid, a salt of a fatty acid or an ester of a fatty acid.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: December 29, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Schloegl, Ursula Murschall, Lothar Bothe, Guenther Crass
  • Patent number: 5118566
    Abstract: A biaxially-oriented film with high mechanical strength, which includes 69 to 94.99% by weight of a polyolefin, 5 to 30% by weight of a natural or synthetic resin having a softening point in the range from 70.degree. to 170.degree. C., and 0.01 to 1% by weight of a nucleating agent, based on the total weight of the film. A method for producing this film includes biaxially drawing the film at temperatures below the melting point of the polyolefin.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: June 2, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Thomas Wilhelm, Lothar Bothe, Guenther Crass, Gunter Schloegl, Winfried Muskalla
  • Patent number: 5110670
    Abstract: A biaxially stretch-oriented film, suitable for the process of transfer metallizing, which comprises a base layer coextruded with covering layers on either side thereof and comprising an inert admixture is disclosed. The three layers are formed of polyolefin and the base layer comprises an additive which migrates from the base layer into the covering layers. The base layer contains the inert admixture in the form of finely divided particles, which partially protrude from the base layer and are completely enveloped by the covering layers. At least one of the two outer surfaces of the covering layers displays, at least in partial areas, an increased roughness attributable to the particles protruding from the base layer.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: May 5, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Janocha, Gunter Schloegi, Lothar Bothe, Guenther Crass
  • Patent number: 5096630
    Abstract: A process for producing a metallizable, sealable, biaxially stretch-oriented multi-ply film includes the steps of: providing melts of a predominantly polypropylene base layer, and first and second polyolefinic facing layers; co-extruding the melts through a flat film die, wherein the first and second polyolefinic facing layers are co-extruded on either side of the base layer; solidifying the co-extruded film by cooling; longitudinally stretching the co-extruded film at a temperature from about 120.degree. to 130.degree. C. in a ratio of from about 5 to 7:1; transversely stretching the co-extruded film at a temperature from about 160.degree. to 170.degree. C. in a ratio of from about 8 to 10:1; and corona-treating one facing layer of the co-extruded film which is metallizable. Each of the melts contains a calcium carbonate neutralizing agent having an absolute particle size of less than about 10 .mu.m, a mean particle size of less than about 0.1 .mu.m, a specific surface area of more than about 40 m.sup.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: March 17, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Lothar Bothe, Gunter Schloegl, Guenther Crass, Thomas Wilhelm
  • Patent number: 5091237
    Abstract: A shrink film comprising at least one polyolefinic layer comprising polypropylene and a resin admixture is disclosed. The film processes a shrinkability of more than 20%, measured at 90.degree. C., in the transverse direction and of less than 8%, also measured at 90.degree. C., in the longitudinal direction. The film is manufactured by coextrusion followed by stretching in the longitudinal and transverse directions, whereby stretching in the longitudinal direction is performed such that the birefringence value .DELTA.n of the longitudinally oriented film does not exceed the range from 10.times.10.sup.-3 to 13.times.10.sup.-3.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: February 25, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Schloegl, Lothar Bothe, Guenther Crass, Ursula Murschall, Herbert Peiffer
  • Patent number: 5085916
    Abstract: The extruded, biaxially oriented dielectric film is composed of high-purity electrical film raw material. It is suitable as electrical insulating film in particular as a dielectric in an electrical capacitor, and exhibits improved dielectric properties for this prupose. The film comprises propylene polymers and stabilizers for the propylene polymers. The raw material of the film has an idealized thermo-oxidation temperature in the range from 260.degree. to 300.degree. C., preferably 260.degree. to 280.degree. C. The dielectric film has an idealized thermo-oxidation temperature of 250.degree. to 300.degree. C., in particular 250.degree. to 280.degree. C. The content of organic neutralizing agents, in particular calcium stearate, in the raw material is less than/equal to 100 ppm.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: February 4, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Thomas Wilhelm, Gunter Schloegl, Lothar Bothe, Guenther Crass
  • Patent number: 5026592
    Abstract: Disclosed is an opaque, biaxially stretch-oriented, polyolefinic multilayered film comprising an opaque core layer and two transparent top layers. The core layer contains a mixture of1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene,2) about 5 to 25% by weight of an inert, particulate filler, and3) about 5 to 30% by weight of a hydrocarbon resin being compatible with the thermoplastic polymer and having a softening point in the range from about 100.degree. to 160.degree. C.,the percentages being each time related to the total weight of the mixture. The top layers are free from admixtures comprising particulate filler and resin. The film possesses high resistance to delamination.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: June 25, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Siegfried Janocha, Gunter Schloegl, Guenther Crass, Lothar Bothe
  • Patent number: 4983447
    Abstract: An opaque polyolefin film having a base layer composed essentially of propylene polymers and having sealing layers present on both sides, composed essentially of sealable olefin polymers, is disclosed. From about 0.2% to 1.5% by weight, relative to the layer of polydialkylsiloxane is incorporated in one of the two sealing layers, and this layer has not been subjected to corona treatment. The other sealing layer has been subjected to corona treatment and has polydialkylsiloxane, not incorporated, but present on the outer surface of this layer, the polydialkylsiloxane having been transferred to this layer by contact between the sealing layer in which polydialkylsiloxane is incorporated. The relative polydialkylsiloxane occupancy of this layer, which is determined by means of ESCA spectroscopy, is not more than 15. The three-layer opaque polyolefin film is prepared by the coextrusion process. It is particularly suitable for use as a packaging film on high-speed packaging machines.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: January 8, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Guenther Crass, Siegfried Janocha, Lothar Bothe
  • Patent number: 4975315
    Abstract: A metallizable, sealable, biaxially stretch-oriented multi-ply film comprises a base layer essentially of polypropylene, a first polyolefinic facing layer and a second polyolefinic facing layer. All of the layers contain a neutralizing agent and a stabilizer against thermal degradation. The neutralizing agent is a calcium carbonate having an absolute particle size of less than 10.0 .mu.m, a mean particle size of less than 0.1 .mu.m, a specific surface area of more than 40 m.sup.2 /g and a whiteness of more than 90% and, the stabilizer comprises a phenolic stabilizer having a molecular weight of more than 1,000 g/mol. One polyolefinic facing layer contains an anti-blocking agent. In addition, a process for producing the metallizable multi-ply film is described, and its use as a packaging material is indicated.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: December 4, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Lothar Bothe, Gunter Schloegl, Guenther Crass, Thomas Wilhelm
  • Patent number: 4975329
    Abstract: A coextruded, biaxailly oriented multilayer film comprises a base layer comprising an extremely pure raw material and outer layer. It is suitable for use as an electrically insulating film, as a dielectric in an electrical capacitor, and has improved dielectrical properties for this purpose. The base layer and the outer layer or layers contain propylene polymer on one or both sides and stabilizers for propylene polymers. The raw material for the base layer has an idealized thermal oxidation temperature in the range of 260.degree. to 300.degree. C., preferably in the range 260.degree. to 280.degree. C., and the raw material for the outer layer or layers has an idealized thermal oxidation temperature in the region of 240.degree. to 300.degree. C., preferably in the range 240.degree. to 270.degree. C. The multilayer film as a whole has an idealized thermal oxidation temperature in the range 250.degree. to 290.degree. C., in paticular in the range 250.degree. to 275.degree. C.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: December 4, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Lothar Bothe, Guenther Crass, Gunter Schloegl, Thomas Wilheim
  • Patent number: 4944970
    Abstract: A tubular, biaxially stretch-oriented packaging film, in particular a sausage casing, comprising a polymer mixture which comprises an aliphatic polyamide, a polyterephthalic acid ester, an aromatic polyamide comprising branched aliphatic diamines having at least 7 carbon atoms and aromatic dicarboxylic acids, or aromatic diamines and aliphatic dicarboxylic acids having 5 to 11 carbon atoms and a dye. The weight amount of the aromatic polyamide is preferably equal to, and particularly preferably greater than, the weight amount of dye. A masterbatch suitable for producing the film is also disclosed. With particular advantage, the film having the above described composition can be dyed deep black or brilliant red.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: July 31, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Stenger, Hans Strutzel, Guenther Crass
  • Patent number: 4925728
    Abstract: A biaxially stretch-oriented multilayer film is disclosed which is produced by coextrusion and is suitable as a release sheet in the production of decorative laminate panels having a matte surface finish. The film comprises a base layer essentially comprising polypropylene and at least one top layer. The top layer essentially comprises(a) 98.5% to 99.6% by weight of a propylene homopolymer and(b) 0.4% to 1.5% by weight of a polydiorganosiloxane,relative to the weight of the top layer.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: May 15, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Guenther Crass, Lothar Bothe, Gunter Schloegl