Phenolic polymers and preparation processes thereof

A process for the preparation of a polymer, comprising a step of polymerizing a compound having the following formula (I):

• wherein:
• R1 is H or a OR7 group, R7 being H, a (C1-C10)alkyl group or a (C2-C6)alkenyl group;
• R2 is a (C1-C6)alkoxy group;
• R3 is H or a radical of formula (II)
• k being an integer varying from 1 to 6;
• R4 is a (C1-C6)alkoxy group or a radical X chosen from the group consisting of:
• (C2-C6)alkenyl groups, (C1-C10)alkyl group, —CHO, —COOH, —CH2OH, and —COORa, Ra being a (C1-C6)alkyl group or a (C2-C12)alkenyl group;
• and wherein:
• when R1 is H, then R3 is a group of formula (II) and R4 is a (C1-C6)alkoxy group, and
• when R1 is a OR7 group, then R3 is H and R4 is X as defined above.