US 5,478,617 A · Multi-layer film and container

Abstract

A multi-layer film is described having an outer layer containing a linear ethylene-.alpha.-olefin copolymer, an intermediate layer containing a linear ethylene-.alpha.-olefin copolymer, and an inner layer containing a resin in which a predetermined amount of polypropylene is contained in a linear ethylene-.alpha.-olefin copolymer, wherein each component has a predetermined density, respectively, and a predetermined amount of a high-density polyethylene is contained in all layers, and a container using the film. There is no fear of a decrease in sealing strength, deformation, deterioration of transparency, etc., even if sterilization is conducted at a temperature condition of not less than 120.degree. C., and, furthermore, the easy peelable seal part is stable even if the film is molded into a container having a plurality of chambers. Therefore, the resulting container can be suitably used for an infusion bag, etc.

Claims10

Dependent claims

A multi-layer film composed of a polyolefin resin, comprising:

(1) an outer layer containing a linear ethylene-.alpha.-olefin copolymer having a density of 0.920 to 0.950 g/cm.sup.3 ;
(2) an intermediate layer having at least one layer containing a linear ethylene-.alpha.-olefin copolymer having a density of not more than 0.920 g/cm.sup.3 ;
and
(3) an inner layer containing a resin in which 20 to 40% by weight of polypropylene is contained in a linear ethylene-.alpha.-olefin copolymer having a density of not more than 0.940 g/cm.sup.3 ;
wherein a high-density polyethylene having a density of not less than 0.960 g/cm.sup.3 is contained in all layers, and an amount of the high-density polyethylene in the outer and intermediate layer is within a range from 15 to 55% by weight and that in the inner layer is within a range from 5 to 50% by weight.

2 more elements

A multi-layer film composed of a polyolefin resin, comprising:

(1) an outer layer containing a linear ethylene-.alpha.-.alpha.-olefin copolymer having a density of 0.940 g/cm.sup.3 ;
(2) an intermediate layer having at least one layer containing a linear ethylene-.alpha.-olefin copolymer having a density of 0.905 g/cm.sup.3 or 0.885 g/cm.sup.3 ;
and
(3) an inner layer containing a resin in which 20 to 40% by weight of polypropylene is contained in a linear ethylene-.alpha.-olefin copolymer having a density of 0.930 g/cm.sup.3 or 0.940 g/cm.sup.3 ;
wherein a high-density polyethylene having a density of not less than 0.960 g/cm.sup.3 is contained in all layers, and the amount of the high-density polyethylene in the outer and intermediate layers is within a range from 15 to 35% by weight and that in the inner layer is within a range from 5 to 20% by weight.

2 more elements

Dependencies are inferred from the claim text.

Multi-layer film and container

Life of this patent

Multi-layer film and container

Life of this patent

Abstract

Claims10