Why we should use tackifier resin into the polymer?

Why we should use tackifier resin into the polymer?

1、to cut down the cost of polymer.
Normally tackifier resin has a lower price than polymer.
Manufacturer can cut down their cost by adding 20% tackifier resin.
2、to increase the tack and peal performance.
3、to improve the low temperature performance.
Here is some test data

Fumaric-rosin-ester-
tack-1