Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Patent
1994-10-04
1995-12-26
Sluby, P. C.
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
428 41, 428218, 428349, 428516, B32B 2732, B65D 6540
Patent
active
054786177
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a multi-layer film and a container molded using the same. More particularly, it relates to a multi-layer film used for a container having a plurality of chambers which is suitably used for containing a liquid medicine, etc., in the medical field, said container being capable of separately containing two or more kinds of medicines and mixing such for use, and a container using the film.
BACKGROUND OF THE INVENTION
Heretofore, in medical plastic containers, various containers having a plurality of chambers have been studied so as to enable them to contain separately two or more kinds of medicines, e.g., amino acid solution and sugar electrolyte solution, antibiotic and liquid for dissolving the same, etc., to mix them aseptically on use. Examples thereof include a container wherein an easy peelable seal part is formed between two chambers using a resin mixture of polyethylene and polypropylene (Japanese Laid-Open Patent Publication No. 2-4671).
However, since heat resistance has not been sufficiently taken into consideration in the above container, sealing strength and drop-shock resistance are deteriorated by sterilization under high-temperature conditions such as high-pressure steam sterilization, hot-water sterilization, etc. Furthermore, deformation occurs and transparency and flexibility are deteriorated. Particularly, when the temperature condition of the sterilization is set at a severe condition, i.e. not less than 120.degree. C., not only is strength drastically reduced but also serious failures such as deterioration of the easy peelable seal part occurs.
On the other hand, there has been proposed a medical bag having a three-layer structure wherein a resin composition composed of a radical-polymerized low-density polyethylene having a density of not more than 0.930 g/cm.sup.3 and a high-density polyethylene having a density of not less than 0.945 g/cm.sup.3 is used for inner and outer layers, respectively, and a resin composition composed of a linear low-density polyethylene having a density of not more than 0.920 g/cm.sup.3 and a high-density polyethylene having a density of not less than 0.945 g/cm.sup.3 are used as an intermediate layer (Japanese Laid-Open Patent Publication No. 4-266759) in order to improve heat resistance.
However, the above container does not have satisfactory heat resistance, and it has not been taken into consideration to provide an easy peelable seal part; therefore, it can not be used for a container having a plurality of chambers.
It is a main object of the present invention to provide a multi-layer film having heat resistance high enough to endure the high-temperature sterilization as described above, wherein an easy peelable seal part causes no weld by a sterilization treatment when it is used for a container having a plurality of chambers, and a container molded using the film.
It is an another object of the present invention to provide a multi-layer film having excellent strength, flexibility and transparency, and a container molded using the film.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided the following multi-layer film and container.
That is, the multi-layer film of the present invention is 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 the amount of the high-density polyethylene in the outer and intermediate layers is within a range of from 15 to 55% by weight, and th
REFERENCES:
patent: 4961495 (1990-10-01), Yoshida et al.
Kashiyama Shigetoshi
Watanabe Katsushi
Mitsui Petrochemical Industries Ltd.
Otsuka Pharmaceutical Factory Inc.
Sluby P. C.
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