Patent ID: 6509087
Filing Date: 2003-01-21
Classification: B32B,C08L,Y10S,Y10T

Abstract:
A heat shrinkable, coextruded polyethylene film laminate comprising two surface layers F1 and F2, and an intermediate layer M interposed therebetween, wherein the surface layer F1 comprisesa linear low density polyethylene having a density DAF1 g/cm3 of 0.910-0.930 g/cm3 and a linear high density polyethylene having a density DCF1 g/cm3 of 0.925-0.945 g/cm3 and being present in an amount of WCF1 % based on a total weight of the linear low density polyethylene having the density DAF1 and the linear high density polyethylene having the density DCF1, wherein the surface layer F2 comprisesa linear low density polyethylene having a density DAF2 g/cm3 of 0.910-0.930 g/cm3 and a linear high density polyethylene having a density DCF2 g/cm3 of 0.925-0.945 g/cm3 and being present in an amount of WCF2 % based on a total weight of the linear low density polyethylene having the density DAF2 and the linear high density polyethylene having the density DCF2, wherein the intermediate layer M comprisesa linear low density polyethylene having a density DAM g/cm3 of 0.910-0.930 g/cm3 and a linear very low density polyethylene having a density DBM g/cm3 of 0.880-0.915 g/cm3 and being present in an amount of WBM % based on a total weight of the linear low density polyethylene having the density DAM and the linear very low density polyethylene having the density DBM, and â€ƒwherein the laminate film satisfies the following conditions (a) through (e) at the same time: (a) DCF1âˆ’DAF1&gE;0.010, (b) DCF2âˆ’DAF2&gE;0.010, (c) DAMâˆ’DBM&gE;0.010, (d) 0.01&lE;{(DCF1âˆ’DAF1)Ã—LF1Ã—WCF1}+{(DCF2âˆ’DAF2)Ã—LF2Ã—WCF2}&lE;0.20 (e) 0.05&lE;(DAMâˆ’DBM)Ã—LMÃ—WBM}&lE;1.40, â€ƒwhere DCF1, DAF1, DCF2, DAF2, DAM, DBM, WCF1, WCF2 and WBM are as defined above and LF1, LF2 and LM represent as follows: LF1=tF1/(tF1+tF2+tM), LF2=tF2/(tF1+tF2+tM), LM=tM/(tF1+tF2+tM), where tF1, tF2 and tM represent the thicknesses of the surface layer F1, surface layer F2 and intermediate layer M, respectively.