Patents Examined by Edith Buffalow
  • Patent number: 5700564
    Abstract: Film-forming means are coextruded to form all plastic multilayer liners and facestocks for pressure-sensitive labels, tapes, decals, signs, bumper stickers, and other products formed from sheet and roll stock. Fill means in a charge for the liner coextrusion affects stiffness and dimensional stability of the liner and/or affects the roughness of a liner face or faces. The film materials of the layers of the constructions are selected according to the cost/benefit characteristics of candidate materials considering the functional or operational requirements of the layer in question.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: December 23, 1997
    Assignee: Avery Dennison Corporation
    Inventor: Melvin S. Freedman
  • Patent number: 5695838
    Abstract: Disclosed are (1) an adhesive polypropylene resin composition comprising (a) 50 to 90 parts by weight of a modified polypropylene or a composition containing said modified polypropylene, said modified polypropylene being graft-modified with at least one monomer selected from the group consisting of an unsaturated carboxylic acid from the group consisting of an unsaturated carboxylic acid and a derivative thereof and (b) 10 to 50 parts by weight of a modified polyolefin other than the modified polypropylene or the composition (a), said modified polyolefin being grafted with at least one monomer selected from the group consisting of an unsaturated carboxylic acid and a derivative thereof, and (2) a multi layer laminate body comprising (i) a layer of a polyolefin (ii) a layer of the above-said adhesive polypropylene resin composition and (iii) a layer of a polyamide resin and/or an ethylene/vinyl alcohol copolymer, said layers being laminated in the order of (i), (ii) and (iii).
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: December 9, 1997
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Haruhiko Tanaka, Hideshi Kawachi
  • Patent number: 5674608
    Abstract: Polymeric, thin oriented films can be made by use of a combination of a hot blown process and a blown bubble process, i.e. a double bubble process. The resulting film has use in replacing PVC for in store stretch wrap applications. Very low density polyethylene, VLDPE, is an especially preferred material for this process. It may be used as a monolayer, or as one layer of a multilayer structure. In practicing the invention, the polymer is extruded and hot blown, and heated to a temperature above its orientation temperature. This heating can be accomplished by the use of a heated liquid reservoir or sock disposed at the lower end of the primary bubble, inside the bubble. The hot blown heated film is then passed through a first set of pinch rolls, re-inflated into a blown bubble, and collapsed at a second set of pinch rolls. Thin, tough and elastic packaging materials are obtained by this process.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: October 7, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Henry G. Schirmer
  • Patent number: 5674607
    Abstract: Polymeric, thin oriented films can be made by use of a combination of a hot blown process and a blown bubble process, i.e. a double bubble process. The resulting film has use in replacing PVC for in store stretch wrap applications. Very low density polyethylene, VLDPE, is an especially preferred material for this process. It may be used as a monolayer, or as one layer of a multilayer structure. In practicing the invention, the polymer is extruded and hot blown, and heated to a temperature above its orientation temperature. This heating can be accomplished by the use of a heated liquid reservoir or sock disposed at the lower end of the primary bubble, inside the bubble. The hot blown heated film is then passed through a first set of pinch rolls, re-inflated into a blown bubble, and collapsed at a second set of pinch rolls. Thin, tough and elastic packaging materials are obtained by this process.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: October 7, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Henry G. Schirmer
  • Patent number: 5624751
    Abstract: Use of a paper carrier for the production of a repulpable carton sealing tape which is finished on one side with a repulpable self-adhesive composition and on the other side with a repulpable silicone-free release based on a copolymer of amide/styrene together with a film-forming agent.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: April 29, 1997
    Assignee: Beiersdorf Aktiengesellschaft
    Inventors: Manfred Spies, Peter Gleichenhagen, Herbert Knolle, Robert Meyer, Andreas Westphal
  • Patent number: 5591496
    Abstract: A method of making a composite sheet material in which at least one lamina of previously unused expanded polystyrene is bonded to a second lamina of recycled expanded polystyrene. The laminae are continuously formed from separate extruders and are merged promptly after extrusion. Heat is applied to the laminae just before they are merged.
    Type: Grant
    Filed: July 13, 1993
    Date of Patent: January 7, 1997
    Assignee: Linpac Plastics International Limited
    Inventors: Michael C. Anderson, Anthony J. Heap, Horst-Ditmar Grone
  • Patent number: 5558930
    Abstract: The present invention provides a multi-layer heat sealable film which is produced by coextrusion and compression rolled orientation. The film comprises at least one barrier layer of a moisture and/or gas resistant thermoplastic material and at least one sealant layer of a heat sealable thermoplastic material.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: September 24, 1996
    Assignee: Tredegar Industries, Inc.
    Inventor: James P. DiPoto
  • Patent number: 5538790
    Abstract: A method to produce a stretch cling film possessing cling without added tackifier or acrylate unit is disclosed. Preferred copolymers to make this film have a solubility distribution breadth index of less than about 35.degree. C. and are ethylene/C.sub.3-20 alpha olefin copolymers with greater than about 4 to about 20 mole percent comonomer content.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: July 23, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Marsha M. Arvedson, Patrick Brant, Paul M. German, John E. Wydila
  • Patent number: 5532047
    Abstract: Disclosed is a biaxially oriented, laminated polyester film having a lamination structure with at least two layers. At least one of the outermost layers of the film is a thin laminated layer A having a thickness of not more than 3 .mu.m. In the layer A, internally formed particles and specified agglomerated particles or mono-dispersed particles are present, or the mono-dispersed particles are present at a very small content. When the polyester film is used as a base film for magnetic recording media, the abrasion resistance of the film surface at a high speed can be greatly increased.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: July 2, 1996
    Assignee: Toray Industries, Inc.
    Inventors: Iwao Okazaki, Tohru Miyake, Koichi Abe, Keisuke Ohshima
  • Patent number: 5529834
    Abstract: A multilayer heat sealable film comprises:(a) a polyolefin film substrate layer;(b) a layer of an ethylene vinyl alcohol copolymer (EVOH), and(c) a heat sealable acrylic polymeric coating applied to (b).The film exhibits excellent oxygen and aroma barrier, and low minimum seal temperature (82.degree. C.).
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: June 25, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Mingliang L. Tsai, Anthony R. Knoerzer
  • Patent number: 5527608
    Abstract: A biaxially oriented heat sealable multilayer film structure, suited for use in high altitude applications, which comprises:(a) a core substrate having two surfaces, comprising i) a layer of homopolymer polyolefin and ii) a layer of block copolymer of ethylene and propylene having a MFR of 1 to 10, adjacent to at least one side of i);(b) a polymeric heat sealable layer on one surface of said core substrate, said heat sealable layer comprising a polymeric material selected from the group consisting of a terpolymer of ethylene, propylene and butene-1, a random copolymer of ethylene and propylene, a random copolymer of propylene and butene-1, and blends thereof; and optionally,(c) a high density polyethylene (HDPE) layer adjacent to the other surface of said core substrate (a).
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: June 18, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Sharon J. Kemp-Patchett, Robert G. Peet
  • Patent number: 5525421
    Abstract: A metallized film combination comprising an oriented polypropylene substrate layer, at least one surface of which having a coating of a vinyl alcohol homopolymer or copolymer hydrolyzed to at least 95% at a pH of greater than 5.0, said coating having a metal layer thereon. The high pH PVOH hydrolysis conditions provide a metallized product of high metal adhesion and good water and oxygen barrier properties.
    Type: Grant
    Filed: November 25, 1994
    Date of Patent: June 11, 1996
    Assignee: Mobil Oil Corporation
    Inventor: Anthony R. Knoerzer
  • 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: 5518792
    Abstract: The improved packaging material having oxygen barrier quality has a thin layer of inorganic substance formed on a layer of resin composition having oxygen barrier quality that comprises at least a thermoplastic resin and an oxidation catalyst. The packaging material is inexpensive, can be processed efficiently and it yet develops high oxygen barrier quality right after processing and maintains it for a prolonged period of time.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: May 21, 1996
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Naoki Masuda, Norimasa Sekine, Takeo Tomatsuri, Keiko Nakamura, Mamoru Sekiguchi
  • Patent number: 5516563
    Abstract: The invention relates to an opaque, matte, multilayer polypropylene film. It includes at least one base layer comprising polypropylene or a polypropylene mixture and fillers, and at least one outer layer which contains a mixture or a blend of two components I and II. Component I essentially contains a propylene homopolymer or a copolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a terpolymer of an .alpha.-olefin having 2 to 10 carbon atoms or a mixture of two or more of said homopolymers, copolymers and terpolymers or a blend of two or more of said homopolymers, copolymers and terpolymers. Component II essentially contains an HDPE having an MFI (50 N/190.degree. C.) of from greater than 1 to 50 g/10 min, measured in accordance with DIN 53 735, or a blend of two components A and B. Blend component A is essentially an HDPE having an MFI (50 N/190.degree. C.) of from greater than 1 to 50 g/10 min, measured in accordance with DIN 53 735.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: May 14, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Detlef E. Schumann, Adolf Wilhelm, Ursula Murschall, Herbert Peiffer, Brigitte Kusch
  • Patent number: 5514473
    Abstract: A copolymer blend having improved extrusion performance comprising from 90 to 50% by weight of vinylidene chloride-vinyl chloride copolymer and from 10 to 50% by weight of a vinylidene chloride-methyl acrylate copolymer wherein the weight percentage of vinyl chloride in the blend is greater than 12% and the weight percentage of methyl acrylate in the blend is less than 2.8%.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: May 7, 1996
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Tito Fornasiero, Mario Paleari
  • Patent number: 5514434
    Abstract: A packaging laminate for a package possessing superior gas and light barrier properties is disclosed, and a method of producing the packaging laminate. The packaging laminate includes a layer of a silicon oxide compound serving as gas barrier and a layer of metal serving as light barrier, these layers being deposited by vacuum deposition on each respective layer of plastic serving as carrier, and being permanently bonded to one another through an interjacent layer of adhesive for the formation of the packaging laminate.By regulating the thickness of the gas and light barrier layers independently of one another, an optional combination of gas and light barrier properties is made possible, whereby the packaging laminate may be more or less "tailor made" for each type of product which is to be packed.
    Type: Grant
    Filed: October 27, 1994
    Date of Patent: May 7, 1996
    Assignee: Tetra Laval Holdings & Finance SA
    Inventor: Lars Lofgren
  • Patent number: 5512371
    Abstract: A method for making improved optical quality lenses is described. The method includes arranging a mold having a molding surface, a curable optical quality resin composition, and a plastic lens preform of optical quality material such that the resin composition is disposed between, and in contact with, the plastic lens preform and the mold. Upon curing, the resin composition forms a cured plastic attached portion that is bonded to the plastic lens preform. The resin composition and plastic lens preform are selected such that the attached portion has a higher scratch resistance, a lower chromatic aberration, and/or a higher ease of edging than the lens preform.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: April 30, 1996
    Assignee: Innotech, Inc.
    Inventors: Amitava Gupta, Ronald D. Blum, Venkatramani S. Iyer, Paul J. Nagg
  • Patent number: 5508090
    Abstract: An oriented, heat-sealable, multilayer polyolefin film is described, which includes a base layer containing polypropylene and resin, and at least one heat-sealable outer layer. The heat-sealable outer layer contains a propylene copolymer and/or a propylene terpolymer and a mixture of an antiblocking agent having a mean particle diameter of from 3 to 5 .mu.m and a further antiblocking agent having a mean particle diameter of from 1 to 2.5 .mu.m. In addition, a process for the production of the multilayer polyolefin film and the use of the film are described.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: April 16, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Peiffer, Ursula Murschall, Gunter Schloegl
  • Patent number: RE35272
    Abstract: An improved method and a product for waterproofing soil utilizing a flexible plastic sheet for providing a water barrier and for providing a means of reflecting light sufficient to prevent damage to the sheet and the underlying soil from direct sunlight comprising a uniform density or multiple-density plastic sheet material which has been manufactured to a desired thickness to contain an upper surface cpable of reflecting light.
    Type: Grant
    Filed: August 18, 1994
    Date of Patent: June 11, 1996
    Assignee: GSE Lining Technology, Inc.
    Inventors: Michael C. Mathieson, Mark W. Cadwallader