Patent ID: 6268029
Filing Date: 2001-07-31
Classification: B32B,G03C,Y10S,Y10T

Abstract:
A package for photosensitive material made of a layered film exhibiting complete light-shielding characteristics comprising a biaxially stretched plastic film layer and a thermoplastic resin film layer containing at least 5 wt % of an ethylene copolymer resin and/or a thermoplastic elastomer, at least one layer of said layered film being a light-shielding layer exhibiting light-shielding characteristics, and at least one layer other than said biaxially stretched plastic film layer being a molecular oriented plastic film layer having a ratio of the tear strength in a direction normal to the flowing direction to that in the flowing direction of not less than 3;wherein said thermoplastic resin layer serves as one or both of said light-shielding layer and said molecular oriented plastic film layer;wherein said thermoplastic resin film layer contains:(1) carbon black in an amount of 0.05 to 40 wt % having a DBP oil absorption amount of 10 to 350 ml/100 g and a sulfur content of not higher than 1 wt % as the light-shielding material; and(2) one or more of hydantoins, hydantoin compounds and urea compounds;wherein said molecular oriented plastic film layer is comprised of an ethylene-based resin film comprising:(A) 5 to 90 parts by weight of an ethylene-.alpha.-olefin copolymer resin having an MFR of 0.1 to 10 g/10 minutes, a density of 0.870 to 0.939 g/cm.sup.3 and a Q-value of not more than 15; and(B) 10 to 95 parts by weight of a high density homopolyethylene resin and/or an ethylene-a-olefin copolymer resin having an MFR of 0.01 to 1.5 g/10 minutes, a density of 0.940 to 0.985 g/cm.sup.3 and a Q-value of not less than 16.