US 6,586,061 B1Granted

Multi-layer film and medical bag using the same

AssigneeJapan Polychem Corporation

InventorsYoshihiko Sasaki, Kazutoshi Takenaka

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Abstract

A multi-layer film contains at least a first layer, a second layer inside thereof, and a third layer inside the second layer. The first layer contains a polypropylene resin (PP). The second layer contains a polyethylene resin (PE) having 70 to 90 wt% of a lower crystalline component (LCC) and 10 to 30 wt% of a higher crystalline component (HCC). The PE has a melt flow rate of 0.1 to 20 g/10 min and in a temperature rising elution fraction elution curve, an elution peak temperature of the LCC is from 45 to 85° C; the ratio of (peak height of LCC)/(height of the minimum valley between LCC peak and HCC peak) is 9 or more; an area ratio of the elution peak temperature or less of LCC is 35% or more. The third layer contains a) PP or b) a high-pressure low density PE having an extrapolation melting completion temperature of melting of 110° C or more; or c) a copolymer of ethylene/C3-18 α-olefin having a density of 0.920 g/cm3 or more.

Claims8

Dependent claims

A multi-layer film, comprising at least a first layer, a second layer inside thereof, and a third layer inside the second layer;

wherein the first layer comprises a polypropylene resin;
and
wherein the second layer comprises a polyethylene resin material, comprising (i) from 70 to 90 wt % of a lower crystalline component and (ii) from 10 to 30 wt % of a higher crystalline component and satisfying the following physical properties (B1) to (B4):
(B1) in a temperature rising elution fraction elution curve of the polyethylene resin material, an elution peak temperature of the lower crystalline component is from 45 to 85° C.;
(B2) in the temperature rising elution fraction elution curve of thc polyethylene resin material, an H/M value is 9 or more, wherein H is a peak height of the lower crystalline component and M is a height of the minimum valley between the lower crystalline component peak and the higher crystalline component peak;
(B3) an area ratio of the elution peak temperature of less of the lower crystalline component is 35% or more based on the total area of the temperature rising elution fraction elution curve of the polyethylene resin material;
and
(B4) a melt flow rate of the polyethylene resin material is from 0.1 to 20 g/10 minutes;
and
wherein the third layer comprises a resin material selected from the group consisting of a) a polypropylene resin;
b) a high-pressure low density polyethylene having an extrapolation melting completion temperature of melting peak, obtained by a differential scanning calorimetry (DSC), of 110° C. or more;
and c) a copolymer of ethylene with an α-olefin having from 3 to 18 carbon atoms, having a density of 0.920 g/cm3 or more.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/539,878Filed 31 Mar 2000
Priority: JP 11-0955821 Apr 1999
Granted: 1 Jul 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
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
C08L 23/04
Not modified by chemical after-treatment: homopolymers or copolymers of ethene
A61J 1/10
For collecting, storing or administering blood, plasma or medical fluids ; Infusion or perfusion containers: bag-type containers