Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1980-08-21
1982-01-19
Ives, P.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
428192, 428461, 428462, 428412, 428481, 428483, 428517, 428518, 428520, B65D 3508, B32B 302
Patent
active
043117422
ABSTRACT:
Disclosed is a retort-sterilizable laminated pouch having an excellent loading pressure resistance, which comprises two laminated sheets, each comprising a flexible gas-barrier substrate and a heat-sealable crystalline olefin resin layer formed on one surface of said substrate, said laminated sheets being piled in the form of a pouch where the olefin resin layers confront each other and the periphery of the pouch of the piled sheets being heat-sealed, wherein the crystalline olefin resin layer is composed of polyethylene having a flow ratio (Kp), defined by the following formula, of at least 165: ##EQU1## wherein MI.sub.2 stands for the melt index (g/10 min) as determined according to the condition E of ASTM D-1238 and MI.sub.20 stands for the melt index (g/10 min) as determined according to the condition E of ASTM D-1238 except that the load is changed to 20.0 Kg and the sample collecting time is changed to 30 seconds, and a density of at least 0.935 g/cc.
It is preferred that the crystalline olefin resin layer be composed of a blend comprising a major amount of polyethylene having a flow ratio (Kp) of at least 165 and a minor amount of polyethylene having a flow ratio (Kp) not higher than 154.
REFERENCES:
patent: 3816230 (1974-06-01), Carreras et al.
patent: 3857754 (1974-12-01), Hirata et al.
patent: 4082854 (1978-04-01), Yamada et al.
patent: 4085244 (1978-04-01), Stillman
Ives P.
Toyo Seikan Kaisha Ltd.
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