JP2015145510A5 - - Google Patents

Claims (8)

Possess a polymer component containing a living radical polymerization the acrylic polymer 60 wt% or more, and terpene tackifier resin having a rosin-based tackifying resin, or a hydroxyl group having a hydroxyl group, a pressure-sensitive adhesive layer containing a crosslinking agent,
The living radical polymerization acrylic polymer has a weight average molecular weight of 300,000 to 2,000,000, a molecular weight distribution (Mw / Mn) of 1.05 to 2.5, and a radical polymerizable monomer having a polar functional group. Having derived structural units,
The rosin-based tackifying resin having a hydroxyl group or the terpene-based tackifying resin having a hydroxyl group has a softening temperature of 70 to 170 ° C. and a hydroxyl value of 25 or more.
The pressure-sensitive adhesive tape, wherein the pressure-sensitive adhesive layer has a gel fraction of 1 to 70% by weight . The pressure-sensitive adhesive tape according to claim 1, wherein the structural unit derived from a radical polymerizable monomer having a polar functional group is a structural unit derived from a (meth) acrylic acid ester having a hydroxyl group. The pressure-sensitive adhesive tape according to claim 2, wherein the content of the structural unit derived from the (meth) acrylic acid ester having a hydroxyl group in the living radical polymerization acrylic polymer is 30% by weight or less. The pressure-sensitive adhesive tape according to claim 1, 2 or 3, wherein the structural unit derived from a radical polymerizable monomer having a polar functional group is a structural unit derived from acrylic acid. The pressure-sensitive adhesive tape according to claim 4, wherein the content of the structural unit derived from acrylic acid in the living radical polymerization acrylic polymer is 0.1 to 10% by weight. The content of the rosin-based tackifying resin having a hydroxyl group or the terpene-based tackifying resin having a hydroxyl group with respect to 100 parts by weight of the living radical polymerization acrylic polymer is 5 to 40 parts by weight. 4. The adhesive tape according to 4 or 5. The pressure-sensitive adhesive tape according to claim 1, 2, 3, 4, 5, or 6, wherein the crosslinking agent is an isocyanate-based crosslinking agent. The pressure-sensitive adhesive tape according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the content of the crosslinking agent is 0.01 to 5 parts by weight with respect to 100 parts by weight of the living radical polymerization acrylic polymer.