3m Innovative Properties Company

Louise A Ziegler

George F Vesley

John D Moon

Mark S Edberg

Robert C Mehner

Robert D Anderson

Disclosed is a novel, multi-stage irradiation process for the production of an acrylic-based adhesive or pressure-sensitive adhesive tape. The first irradiation step or stage employs electromagnetic radiation at a relatively low average intensity (i.e., 0.1 to 20 mW/cm ) and the subsequent step employs electromagnetic radiation at a relatively higher average intensity (i.e., greater than 20 mW/cm .) Also disclosed are acrylic-based psa tape materials made by the novel process.

Multi-stage irradiation process for production of acrylic based adhesives and adhesives made thereby

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 employs electromagnetic radiation at a relatively low average intensity (i.e., 0.1 to 20 mW/cm,) 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/cm,) to complete the photopolymerization. Also disclosed are acrylic-based psa tape materials made by the novel process.

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Minneapolis, MN, United States of America

Louise A Ziegler