MULTI-STAGE IRRADIATION PROCESS FOR PRODUCTION OF ACRYLIC BASED COMPOSITIONS AND COMPOSITIONS MADE THEREBY

摘要

Disclosed is a novel, multi-stage irradiation process for the production of acrylic-based compositions such as adhesives or pressure-sensitive adhesive tapes. The first irradiation step or stage emplo ys electromagnetic radiation at a relatively low average intensity (i.e., 0.1 to 20 mW/cm2) to effect a relatively low extent of monomer conversion, and the subsequent step employs electromagnetic radiation at a relatively higher average intensity (i.e., greater than 20 mW/cm2) to complete the photopo- lymerization. Also disclosed are acrylic-based psa tape materials made by th e novel process.