Patent ID: 7687123
Filing Date: 2010-03-30
Classification: B32B,Y10T

Abstract:
1. A multilayer, heat-shrinkable film comprising a layer containing at least one semi-crystalline polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 6/66, and polyamide 6/12, wherein upon conditioning the film at 120° F. and at least 80 percent relative humidity for 24 hours, the layer containing the at least one semi-crystalline polyamide exhibits an FTIR Transmission Absorbance Ratio: wherein A 1199 is determined by integrating a peak area between 1223.6 cm −1 and 1186.0 cm −1 with a baseline made by connecting points on the curve at 1223.6 cm −1 and 1186.0 cm −1 with a straight line, and wherein A 1170 is determined by integrating a peak area between 1186.0 cm −1 and 1152.5 cm −1 with a baseline made by connecting points on the curve at 1186.0 cm −1 and 1152.5 cm −1 with a straight line, with the multilayer film comprising a total semi-crystalline polyamide content of at least 35 volume percent based on total film volume, the multilayer film having a total free shrink at 185° F. of at least 35 percent as measured using ASTM D-2732.