ADHESIVE SHEET

摘要

The present invention relates to an adhesive sheet including a substrate sheet and an adhesive layer, wherein the substrate sheet has a void containing layer capable of the air permeability from the surface contacting with the adhesive layer, the air permeability measured by specific test method is 1×103 to 3×105 seconds. The present invention can provide an adhesive sheet which is capable of efficiently preventing the occurrence of the swelling or the floating (that is the occurrence of a blister) even if the time passes when adhered to the surface of the various plastic moldings. In addition, the present invention can provide the adhesive sheet capable of exhibiting excellent blister resistance to any adhesive agent.

主权项

1. An adhesive sheet comprising a substrate sheet and an adhesive layer,
wherein the substrate sheet has a void capable of the air permeability from the surface contacting with the adhesive layer, the air permeability measured by the following test method is 1×103 to 3×105 seconds, An adhesive-coated PET film having a hole with a diameter of 6 mm (manufactured by Sumitomo 3M Limited, “Polyester Tape 850”) is adhered to the surface of the adhesive layer of the adhesive sheet and ten-test sheets are prepared by cutting the adhesive sheet into sheets of 20 mm×20 mm. Each test sheet measures the number of seconds until the pressure in the big vacuum container changes from 50.7 kPa to 48.0 kPa, according to 9-a) in JIS P 8119, by using Bekk smoothness defined in JIS P 8119 and overlapping the hole of the test sheet on the circular hole of the Bekk smoothness. The number of seconds of the average value is determined as the air permeability of the substrate sheet.