from about 5% to {HEAD ~ about 20%} by {TAIL ~ weight} of at least one organic rosin ester 
by
from about 5 % to { HEAD ~ about 20 % } by { TAIL ~ weight } of at least one organic rosin ester
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH