Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1987-04-30
1990-06-26
Buffalow, Edith
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428461, 428516, 428518, 428458, B32B 2700
Patent
active
049371398
ABSTRACT:
Compositions of matter, sheet material, and packages made therefrom. Novel compositions of polypropylene and high density polethylene are useful as sealant materials for flexible sheet material structures wherein the sheet material is sealable to a preformed container, to form a lid therefor, and is peelable therefrom, with cohesive failure of the sealant layer in the area of the formed seal. The novel sealant layer compositions provide for package closure and sealing which is capable of withstanding retort conditions while maintaining the integrity of the package closure and seal. Concurrently the lid is readily peeled from the package to provide access to the interior of the package. The peelability comprises cohesive failure of the sealant material in a novel blend of a polypropylene polymer with an ethylene polymer having a density of at least 0.940. The novel sealant materials of the invention can be used on a variety of multiple layer sheet material substructures, and particularly those providing barrier properties to food type packaging; especially barrier to the transmission of oxygen and moisture. Typical barrier materials are metal foil, vinylidene chloride copolymer, vinyl alcohol copolymer, olefin polymers and copolymers, and combinations of the above materials.
REFERENCES:
patent: 3358053 (1967-12-01), Hostetler
patent: 3937758 (1976-02-01), Castagna
patent: 4183845 (1980-01-01), McGee
patent: 4189519 (1980-02-01), Ticknor
patent: 4254169 (1981-03-01), Schroeder
patent: 4311807 (1982-01-01), McCullough
patent: 4336621 (1982-06-01), Yoshimura et al.
patent: 4389450 (1983-01-01), Schaefer et al.
patent: 4405667 (1983-09-01), Christensen et al.
patent: 4487871 (1984-12-01), Ishibashi et al.
patent: 4501798 (1985-02-01), Koshak et al.
patent: 4578316 (1986-03-01), Clauson et al.
patent: 4610914 (1986-09-01), Newsome
patent: 4613547 (1986-09-01), Wagner
patent: 4615922 (1986-10-01), Newsome
patent: 4615926 (1986-10-01), Hsu et al.
patent: 4622193 (1986-11-01), Kresge et al.
patent: 4626456 (1986-12-01), Farrell
patent: 4666778 (1987-05-01), Hwo
patent: 4698247 (1987-10-01), Murray et al.
patent: 4726984 (1988-02-01), Shah
Nippon Chemtec Consulting Inc. (V-A-204-3) Easy Openable, Heat-Sealable and Retortable Lid for Food Container (III) Ohtsuka Food Industry & Toyo Seikan-date unknown refers to Japan Patent Open 77465/1982 and 1672/1983.
Bauer Frank
Genske Roger P.
American National Can Company
Audet Paul R.
Buffalow Edith
Wilhelm Thomas D.
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