Film laminate for sterile flexible containers
AssigneeBaxter Travenol Laboratories, Inc.
InventorsWilliam D. Johnston, Leonard Czuba, R. D. Webster
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Abstract
A film laminate for flexible containers capable of containing a product to be maintained and accessed under sterile conditions. The laminate having an outside layer of linear low density polyethylene, a core layer of nylon, an inside layer of linear low density polyethylene and two layers of a polyurethane adhesive for bonding the layers.
Claims32
A laminate film structure having sufficient flexibility, strength, heat sealability, and slip properties for producing on a packaging machine a flexible container for containing a liquid to be administered into a patient's body comprising:
- a layer of a linear low density polyethylene for forming an outside layer of the flexible container;
- a layer of biaxially oriented nylon for forming a core layer of the flexible container;
- a layer of a linear low density polyethylene for forming an inside layer of the flexible container;
- and
- the outside layer and inside layer being bonded to the core layer by separate layers of polyurethane adhesive.
A flexible container capable of containing a fluid or solid under sterile conditions having a body portion with opposed, perpherally sealed walls forming the container the walls being constructed from a five layer laminate comprising:
- an outside layer constructed from linear low density polyethylene;
- a core layer constructed from a biaxially oriented polyamide;
- an inside layer constructed from linear low density polyethylene;
- and
- two layers of a urethane adhesive bonding the inside and outside layers to the core layer on opposed sides thereof.
A laminate film structure having sufficient flexibility, strength, heat sealability, and slip properties for producing in a packaging machine flexible containers having fitments attached thereto and capable of containing a liquid to be maintained under sterile conditions comprising:
- an inner layer constructed from polyethylene, the inner layer having a thickness of approximately 40 to 100 microns;
- a core layer constructed from biaxially oriented polyamide, the core layer having a thickness of approximately 10 to 40 microns;
- an outer layer constructed from polyethylene and having a thickness of approximately 40 to 100 microns, the outer layer including a slip agent and having a coefficient of friction of approximately 0.2 to about 0.4;
- and
- two layers of an aliphatic polyurethane bonding the inner and outer layers to the core layer.
A laminate film structure having sufficient flexibility, strength, heat sealability, and slip properties for producing on a packaging machine flexible containers having fitments attached thereto and capable of containing a frozen product to be maintained under sterile conditions comprising:
- an inner layer constructed from polyethylene, the inner layer having a thickness of approximately 40 to 100 microns;
- a core layer constructed from biaxially oriented polyamide, the core layer having a thickness of approximately 10 to 40 microns;
- an outer layer constructed from polyethylene and having a thickness of approximately 40 to 100 microns, the outer layer including a slip agent and having a coefficient of friction of approximately 0.2 to about 0.4;
- two layers of an aliphatic polyurethane bonding the inner and outer layers to the core layer;
- and
- the glass transition state of the laminate film structure being less than -25.degree. C.
Dependencies are inferred from the claim text.