Abstract
The miscibility and the PSA (pressure sensitive ahesives) perfbnnance (l80°peel strength,
probe tack and holding power) of acrylic copolymer/ disprcportionated rcsin systems were
investigated. And the PSA performance was measured over a wide range of time scale and temperature.
The influence of the viscoelasticity of PSA on the rheological characteristics of
PSA perfblmance was discussed. A range of the miscibility became smaller as the tackifler was
bulkler (as the Tg of the tackifier increases,or as the Tg of the bend system increases).
In case of miscible blend systems, the viscoelasticity (the storage modulus, the loss modulus) shifted
toward higher temperature-lower frequency and at the same time the PSA performance shifted
toward lower rate side along the X (rate)-axis as the tackifier was bulkier. We found a few
systems where a single Tg could be measured in spite of the fact that two phases were observed
mlcmscopically. The PSA perfomance of such systems shifted toward lower rate side along the
Ｘ (rate)-axis as the Tg increases just as the case of miscible blend systems.
