20+ years ago it seemed like every paper company had a chemicals division that was doing just, refining and modifying rosin from pine stumps to make tackifiers for pressure-sensitive adhesives, fluxes for solder, inks and toners, and much more. Consolidation of the broader chemical industry has been mirrored in the rosin industry. Many of the manufacturer's names from long ago are gone but the tradenames (Foral, Zonarez) are still around.
While there is an ever increasing interest in biosourcing as many chemicals as possible, the rosin industry has been doing so for decades. Using these chemicals in polymers is hardly a recent conversion to green technology that might be implied.
[*] Yes, Xerox is still around.