Abstract
The probe tack，the dynamic mechanical analysis (DMA)，and the pulsed NMR of a silicone PSAs were measured. The elucidation of the behavior of a tack was tried from the relaxation spectrum and the dynamic mechanical analysis. From the analysis of the relaxation spectrum，it becomes clear that the value of a probe tack depend in a large part on the quantity of MQ resin that exists in a hard segment. DMA was measured in order to divide the behavior of this MQ resin into a contact process and a debonding process. In the contact process，the temperature at which E' was 10⁵Pa was converted into the temperature of probe tack measurement by using the WLF equation.Moreover，in a debonding process，probe tack measurement temperature is equivalent to a temperature low 80℃ in DMA measurement. Therefore，E' is decreasing monotonously with a rise in temperature. Thatis，in a debondingprocess，the value of a tack becomes large at low temperature. From a contact process and a debonding process，a probe tack will indicate the maximum value with the reduced temperature at which E' is10⁵Pa. This result isconforming to the evaluated result of a probe tack.
