However, NR alone does not exhibit sufficient adhesive tack, which can be defined as the ability to adhere to other materials with dissimilar compositions [1], Therefore, tackifying resins (e.g., rosin derivatives, aliphatic or aromatic hydrocarbon resins, and
polyterpenes) are typically used to improve the surface adhesion of NR to other materials [2, 3].
Depending on the number of blocks, they can be classified as monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), triterpenes (C30), tetraterpenes (C40), and
polyterpenes [21].
They are classified as hemiterpenes (C5), monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), sesterpenes (C25), triterpenes (C30), tetraterpenes (C40), and
polyterpenes (>C40).
The adhesive composition comprises an amorphous polyalpha-olefin and a tackifier selected from at least one of the group consisting of: petroleum distillates, rosin, rosin esters, and
polyterpenes. The bonded structure has a dynamic peel strength between about 150 and about 1000 grams per 25 millimeters.
Tackified Amorphous-Poly-Alpha-Olefin-Bonded Structures: No. 7,517,579; Stephen Campbell, Daniel Hesse, Richard Schultz, Mark Jung, Richard Hansen; Cristian Neculescu, Sandra Rogers, Violet Grube, Rhiannon Thoresen, Thomas Killian, Jonathan Rice, Palani Wallajapet, Courtney Shea, Jason Fairbanks, Prasad Potnis and Randall Palmer, assignors to Kimberly-Clark Worldwide, Inc., Neenah, WI Absorptions at 1170 and 1145 [cm.sup.-1] typical of isopropyl groups derived from lignin decomposition are more visible in semicoking liquids, while mono-, sesqui-, and
polyterpenes manifest themselves at 2800-3000 and 800-840 [cm.sup.-1] conspicuously in bark- and needle-derived liquids.
Rosin derivatives,
polyterpenes and petroleum resins can be used for pressure-sensitive adhesives.