Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1991-07-01
1994-08-02
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524505, 524524, 524563, C08K 520
Patent
active
053346432
ABSTRACT:
Heat-sealable thermoplastic elastomeric films comprise from approximately 35% to about 65% of an A-B-A block copolymer wherein "A" blocks are derived from polystrene or a polystrene homolog and said "B" blocks being derived from lower alkenes and from about 25% to about 55% of an ethylene vinyl acetate copolymer, the ethylene vinyl acetate copolymer comprising approximately 28% vinyl acetate. The films are heat-sealable to various substrates including polyvinyl chloride. Once sealed to the substrate, the film may be readily peeled from the substrate by the application of a low and relatively constant peel force. A method for measuring the peel strengths of the film is disclosed. The films are especially adapted to being heat-sealed to a substrate which forms, together with the substrate a package, or multiple serially connected packages. Since the films may be peeled from such a substrate by the application of a low and relatively constant peel force, the films may be peeled from the substrate and the packaged articles extracted from the compartments in a controlled manner. Shear forces generated by flexing or winding the substrate are absorbed by the films without affecting the seal formed with the substrate.
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U.S. patent application Ser. No. 760,691 (abandoned).
Bleutge John C.
Meier Harold E.
Rexene Products Company
Sweet Mark
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