Patent ID: 8685523
Filing Date: 2014-04-01
Classification: B32B,C09J,G02B,Y10T

Abstract:
1. An optical surface protection film, comprising: a substrate layer; and a pressure-sensitive adhesive layer placed on one side of the substrate layer, wherein the substrate layer has a pressure-sensitive adhesive layer-side surface with an arithmetic average surface roughness (Ra wherein the optical surface protective film is further characterized in that it has no pressing marks when evaluated by attaching the optical surface protective film to a prism sheet, which prism sheet has a prism angle of 90° and a prism pitch of 50 μm, at a linear pressure of 18 N/cm and a rate of 3 m/minute, storing the resulting laminate under a pressure of 1 MPa at 50° C. for 24 hours, peeling off the optical surface protective film at 23° C. and 50% relative humidity, and visually determining from the flat face of the prism sheet opposite to the prism face the presence or absence of pressing marks, wherein the substrate layer is formed from polypropylene, and wherein the pressure-sensitive adhesive layer is made of a rubber-based pressure sensitive adhesive.