Resole phenolic resins, processes of synthesis of said resins and use thereof

Phenolic resin synthesis process, characterized in that it comprises the steps of:

• a) mixing phenol, lignin and optionally aldehyde at a temperature range of 25 to 60° C. until fully homogenized;
• b) adding a catalyst;
• c) adding aldehyde until it reaches a temperature of 45 to 95° C.;
• d) keeping the obtained product at a temperature of 45 to 95° C.;
• e) adding catalyst to the obtained product;
• f) keeping the obtained product at a temperature ranging from 45 to 95° C.;
• g) adjusting the temperature of the obtained product to 40 to 70° C.;
• h) optionally adding a catalyst;
• i) adding urea;
• j) optionally keeping the obtained product at a temperature of 40 to 70° C.;
• and
• k) cooling to room temperature.