Patent ID: 8128779
Filing Date: 2012-03-06
Classification: B32B,C09J,Y10T

Abstract:
1. A method of making a multi layer protective film, the method comprising steps: (a) forming a PU layer comprising an at least partially crosslinked polyurethane, the at least partially crosslinked polyurethane comprising at least one of a polyester-based polyurethane or a polycarbonate-based polyurethane; (b) forming a TPU layer comprising a polycaprolactone-based thermoplastic polyurethane; (c) forming a PSA layer comprising a pressure sensitive adhesive; (d) bonding one major surface of the PU layer to one major surface of the TPU layer; and (e) bonding the PSA layer to an opposite major surface of the TPU layer; wherein the TPU layer is sandwiched between the PU layer and the PSA layer, and wherein at least one of steps (a) or (b) comprises step: step (b) comprises step: step (a) comprises step (i) and step (b) comprises step (ii).