Patent ID: 7258919
Filing Date: 2007-08-21
Classification: C09J,Y10T

Abstract:
1. An acrylic pressure sensitive adhesive containing an acrylic polymer and a tackifier, wherein the acrylic polymer is polymerized with a polymerization initiator having a 10-hour half-life at 80° C. or lower and under a polymerizing condition carrying out the reaction while keeping at the temperature higher than 10-hour half-life temperature and keeping the polymerization temperature T in the final stage of the polymerization in a range satisfying the condition defined by the following equation 5, wherein the tackifier contains 13% by weight or lower of a component with 600 or lower molecular weight, which has 500 ppm or lower of volatile component concentration A calculated by the following equation (1), when the acrylic pressure sensitive adhesive is heated at 90° C. for 30 minutes: in the equation (1), the volatile component content X is an amount measured by conversion into toluene wherein t½ is 10-hour half-life temperature.