US 8,784,958 B2Granted

Multilayer film and container

AssigneeOtsuka Pharmaceutical Factory, Inc.

InventorsFujio Inoue, Isamu Tateishi, Yasushi Morimoto

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Abstract

In a multilayer film including a first layer (1), a second layer (2), a third layer (3), a fourth layer (4) and a fifth layer (5) stacked in this order, the first layer (1) is composed of a propylene-ethylene random copolymer and/or a polypropylene homopolymer, and the second layer (2) and the fourth layer (4) are each composed of a mixture of a propylene-ethylene random copolymer and an α-olefin elastomer. The third layer (3) is composed of a mixture of a polycycloolefin and polyethylene, and the fifth layer (5) is composed of a mixture containing a polypropylene homopolymer and a propylene-ethylene random copolymer in a weight ratio of 90:10 to 10:90. A container is formed of the multilayer film with an outer layer and an inner layer thereof being defined by the first layer (1) and the fifth layer (5), respectively.

Claims7

Dependent claims

A multilayer film comprising:

a first layer;
a second layer provided on the first layer;
a third layer provided on the second layer;
a fourth layer provided on the third layer;
and
a fifth layer provided on the fourth layer;
wherein
the first layer comprises a propylene-ethylene random copolymer having a melt flow rate not less than 0.5 g/10 minutes and not greater than 10 g/10 minutes as measured at 230° C.;
the second layer and the fourth layer each comprise a mixture of a propylene-ethylene random copolymer and an α-olefin elastomer;
the third layer comprises a mixture of a polycycloolefin and a polyethylene;
and
the fifth layer comprises a mixture containing a polypropylene homopolymer having a melt flow rate not less than 0.5 g/10 minutes and not greater than 5 g/10 minutes as measured at 230° C. and a propylene-ethylene random copolymer having a melt flow rate not less than 0.5 g/10 minutes and not greater than 10 g/10 minutes as measured at 230° C. in a weight ratio of 90:10 to 10:90 and;
the propylene-ethylene random copolymer in the second layer and the fourth layer is a mixture of a low-MFR propylene-ethylene random copolymer having a melt flow rate not less than 0.5 g/10 minutes and less than 5 g/10 minutes as measured at 230° C. and a high-MFR propylene-ethylene random copolymer having a melt flow rate not less than 5 g/10 minutes and not greater than 10 g/10 minutes as measured at 230° C.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/528,305Filed 18 Feb 2008
Priority: JP 2007-04406723 Feb 2007
Published: US 2010/0143627 A110 Jun 2010
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

A61J 1/2093
Arrangements for transferring or mixing fluids, e.g. from vial to syringe: containers having several compartments for products to be mixed
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
B65D 65/40
Packaging materials of special type or form: applications of laminates for particular packaging purposes

Family

US 2010/0143627 A1Pre-grant publication · published 10 Jun 2010
US 8,784,958 B2This patent

From the US filing history. Foreign family members aren’t listed.

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