A composition contains 5-15 wt% CNS-derived species and a polymer resin having a hydroxyl content of at least 1.5 wt% and a melt viscosity of at least 8 Pa.s at a shear rate of 0.1 s1 at a temperature 60 ℃ greater than the highest temperature at which the resin undergoes a thermal transition. The polymer resin further has either a solubility in a 1:1 (w/w) mixture of butyl acetate and propylene glycol methyl ether acetate of at least 5 wt%, an acid number of at least 100, or both.