Patent ID: 8980399
Filing Date: 2015-03-17
Classification: C09J,Y10T

Abstract:
1. A pressure-sensitive adhesive sheet having improved weather resistance comprising a base material and a pressure-sensitive adhesive layer and having a plurality of through-holes passing through from one surface to the other surface, the base material comprising a blended resin composition, the blended resin composition containing: (A) 50 to 88 wt % of a polyolefin-based resin; (B) 10 to 48 wt % of a resin depolyrmerizable by heating selected from the group consisting of a styrene-based resin and an acrylic-based resin excluding the polyolefin-based resin (A); and (C) 2.0 to 30 wt % of a pigment selected from the group consisting of light-absorbing inorganic pigments, the pigment being sufficiently dispersed within the blended resin composition for improving the weather resistance of the base material; and the pressure-sensitive adhesive sheet has an improved weather resistance determined by the appearance of no cracking or whitening defects on a surface of a 50 mm×50 mm sized test sheet of the pressure-sensitive adhesive sheet, after attaching the test sheen. without any release liner to a melamine coated plate, and subjecting the attached test sheet to weather resistance testing using a Sunshine Weather Meter (S80 manufactured by Suga Test Instruments Co., Ltd.) for 2000 hours under conditions of a black panel temperature of 63° C. a temperature and humidity in the chamber of 43° C. and 50% RH, an irradiance of 60 W/m