Abstract: The present invention concerns a protective membrane composition comprising: A bio-based composition containing: a) a refined pyrolytic lignin having a viscosity ?3000 mPa·s at 180° C., measured according to the ASTM D2171 standard method, and a bituminous composition, or b) said refined pyrolytic lignin, and at least one oil chosen from the group consisting of vegetable oils, petrochemical oils, and mixtures thereof, where the bio-based composition is substantially free of any additional bituminous composition content, at least one polymer forming a polymeric matrix, wherein said bio-based composition is homogenously dispersed, and the protective membrane composition having a Newtonian viscosity comprised between 1500 and 30000 mPa·s, preferably between 3000 and 15000 mPa·s, determined according to the ASTM D2171 standard method.

Abstract: Method for production of a binder compound wherein crude tall oil pitch is mixed with calcium hydroxide or calcium oxide, and wherein after mixing the crude tall oil pitch with the calcium hydroxide or calcium oxide, the mixture of crude tall oil pitch and calcium hydroxide or calcium oxide is allowed to react and then again further crude tall oil pitch and a polymer are added to the reacted mixture in order to obtain a base substance for the production of a roof covering membrane, a road surfacing material or a carpet backing.