Natural Rubber
Loss of adhesive properties and color formation are important parameters to be measured
after film aging.
Films obtained from the following formulation, 100 parts NR, 80 parts rosin ester
and 1000 parts toluene, are aged at 70°C for several days. In figures below
you can seee, better tack retention (Figure 1) and improved color retention (Figure
2).
Figure 1 : Loop Tack (PSTC-5) of NR solvent-based Adhesive
After Film Aging at 70°C
Adhesive films (-35 Nm) coated on polyester foils are aged covered with silicon
paper. All values are averages of 3 replicates (± 10% relative).
Figure 2 : Yellowness Index of NR Solvent-based Adhesive
After Film Aging at 70°C
