Title: Flexible double-layer polypropylene laminates for the packaging of food products

Abstract: A flexible double-layer polypropylene laminate consisting of a bioriented film consisting essentially of isotactic polypropylene with an atactic polypropylene content of less than 6% by weight and an intrinsic viscosity (standard ASTM D 1601) of from 1.5 to 3.0 dl/g, adhesively bonded with a non-oriented film consisting essentially of a mixture of isotactic polypropylene and atactic polypropylene, the latter in an amount of from 15 to 30% by weight of the total weight of the said mixture, the isotactic polypropylene of said mixture having an intrinsic viscosity (standard ASTM D 1601) of from 1.0 to 1.5 dl/g and the atactic polypropylene of said mixture having a density (standard ASTM D 1505) of from 0.855 to 0.865 g/cm.sup.3 and a viscosity at 160.degree. C. of from 3,000 to 10,000 cps.

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Inventors: Buzio, Pierpaolo (Rho, IT)
Edefonti, Lucio (Busto Arsizio, IT)

Application Number: 895822
Filing Date: 1978-04-13
Publication_date: 1979-07-31
Assignee: Societa' Italiana Resine S.I.R. S.p.A. (Milan, IT)
Primary Class(es): 428/424.8 156/182, 156/331.4, 426/126, 428/516, 428/523, 428/910
Other Classes:
US Patent Ref:

3547682	Dec, 1970	Erb	427/409.
3553073	Jan, 1971	Rausing	427/411.
3666585	May, 1972	Barbehenn	428/910.
3695918	Oct, 1972	Ward	428/424.
3775549	Nov, 1973	Matsuda	156/278.
3862869	Jan, 1975	Peterson	428/910.
3887755	Jun, 1975	Zammer	428/424.
3965271	Jun, 1976	Harrington	428/910.

Other Refs: 76672813192321440317

Sep, 1967	CA
Jun, 1973	GB
Jun, 1973	GB

Primary Examiner: Robinson, Ellis P.
Assistant Examiner:
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak