Patent ID: 6797398
Filing Date: 2004-09-28
Classification: A61J,B32B,Y10T

Abstract:
A plastic film for medical liquid containers which comprises at least three layers, wherein the three layers are:a first layer composed mainly of propylene homopolymer which is a mixture of two or more kinds of propylene homopolymer in a ratio of from 1:9 to 9:1 (by weight), the first one having a melt flow rate of 0.1-5 g/10 mm at 230Â° C. and a density of 880-913 kg/m3, and the second one having a melt flow rate of 5-50 g/10 mm at 230Â° C. and a density of 880-913 kg/m3, such that the resulting mixture has a melt flow rate no higher than 5 g/10 mm at 230Â° C.; a second layer containing polypropylene resin, polyethylene resin and thermoplastic elastomer; and a third layer composed mainly of copolymer of propylene and other monomers and functions as a sealing layer; wherein said three layers are laminated without the aid of a bonding layer; each layer does not contain a non-elastomeric block copolymer of benzene-ring-free olefin and propylene; and said second layer acts as an intermediate layer in the plastic film.