Patents Represented by Attorney Joe Harps

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  • Method of making a thermoplastic receptacle having improved high temperature seal
    Patent number: 4352702
    Abstract: The high temperature strength of a heat seal which bonds irradiatively cross-linkable thermoplastic materials together to form a receptacle can be significantly improved by irradiating the receptacle after the seal has been formed. This technique is especially effective for improving the high temperature seal strength of packaging film laminates such as those having a layer of an olefin homopolymer or copolymer and a layer of hydrolyzed ethylene-vinyl acetate copolymer.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: October 5, 1982
    Assignee: W. R. Grace & Co.
    Inventor: Norman D. Bornstein
  • Thermoplastic film having improved handling and sealing characteristics and receptacle formed therefrom
    Patent number: 4352844
    Abstract: Disclosed is a multi-layer, heat shrinkable, thermoplastic packaging film which will produce heat seals having improved strength both in the presence of and absence of grease at elevated temperatures, e.g., at shrink temperatures. The layer providing the sealing surface comprises an ethylene-vinyl acetate copolymer which is more crystalline and about half the thickness of the adjacent layer of less crystalline ethylene-vinyl acetate copolymer. Bags for food products can be made from the film at a faster rate than with prior art films.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: October 5, 1982
    Assignee: W. R. Grace & Co.
    Inventor: Norman D. Bornstein
  • Coextruded, heat-shrinkable, multi-layer, polyolefin packaging film
    Patent number: 4352849
    Abstract: The multi-layer polyolefin shrink film of this invention provides a unique combination of shrink tension, optical clarity, cuttability, sealability, shrink temperature range, and tear resistance which is highly desirable for many packaging applications. The preferred film has three layers in which the core layer comprises an ethylene-vinyl acetate copolymer blended with an ethylene-propylene copolymer and each surface layer comprises an ethylene-propylene copolymer.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: October 5, 1982
    Assignee: W. R. Grace & Co.
    Inventor: Walter B. Mueller