Thermoassociative and exchangeable copolymers, composition comprising same

A composition resulting from the mixing of at least one polydiol random copolymer A1 resulting from the copolymerization:

• of from 1 mol % to 30 mol % of at least one first monomer M1 of general formula (I):
• in which:
• R1 is chosen from the group formed by —H, —CH3 and —CH2—CH3;
• x is an integer ranging from 1 to 18;
• y is an integer equal to 0 or 1;
• X1 and X2, which may be identical or different, are chosen from the group formed by hydrogen, tetrahydropyranyl, methyloxymethyl, tert-butyl, benzyl, trimethylsilyl and t-butyldimethylsilyl;
• or
• X1 and X2 form, with the oxygen atoms, a bridge having the following formula
• in which:
• the asterisks (*) symbolize the bonds to oxygen atoms,
• R′2 and R″2, which may be identical or different, are chosen from the group formed by hydrogen and a C1-C11 alkyl;
• or
• X1 and X2 form, with the oxygen atoms, a boronic ester having the following formula:
• in which:
• the asterisks (*) symbolize the bonds to oxygen atoms,
• R″2 is chosen from the group formed by a C6-C30 aryl, a C7-C30 aralkyl and a C2-C30 alkyl;
• with from 8 mol % to 92 mol % of at least one second monomer M2 of general formula (II-B):
• in which:
• R2 is —CH3;
• and
• R′″3 is a linear C9-C15 alkyl group, and with from 0.1 mol % to 62 mol % of at least one third monomer M2 of general formula (II B) in which:
• R2 is —CH3;
• and
• R′″3 is a linear C16C24 alkyl group, and
• with from 5 mol % to 22 mol % of styrene
• wherein the polydiol random copolymer A1 is obtained by a process comprising at least:
• one step of radical polymerization controlled by reversible addition fragmentation chain transfer in the presence of a transfer agent having a thiocarbonylthio group and
• a step of removal of the thiocarbonylthio group from the polydiol random copolymer A1,
• a compound A2 comprising at least two boronic ester functions,
• wherein compound A2 is a compound of formula (III):
• in which:
• w1 and w2, which may be identical or different, are integers chosen between 0 and 1;
• R4, R5, R6 and R7, which may be identical or different, represent a group chosen from a hydrogen atom, a hydrocarbon-based group comprising from 1 to 30 carbon atoms, optionally substituted with one or more groups chosen from:
• a hydroxyl, a group —OJ or —C(O)—O—J with J being a hydrocarbon-based group comprising from 1 to 24 carbon atoms;
• L is a divalent bonding group chosen from the group formed by a C6-C18 aryl, a C6-C18 aralkyl and a C2-C24 hydrocarbon-based chain, or compound A2 is a random copolymer resulting from the copolymerization
• of at least one monomer M4 of formula (IV):
• in which:
• t is an integer equal to 0 or 1;
• u is an integer equal to 0 or 1;
• M and R8 are identical or different divalent bonding groups, chosen from the group formed by C6-C18 aryl, a C7-C24 aralkyl and a C2-C24 alkyl,
• X is a function chosen from the group formed by —O—C(O)—, —C(O)—O—, — C(O)—N(H)—, —N(H)—C(O)—, —S—, —N(H)—, —N(R′4)— and −O— with R′4 being a hydrocarbon-based chain comprising from 1 to 15 carbon atoms;
• R9 is chosen from the group formed by —H, —CH3 and —CH2—CH3;
• R10 and R11, which may be identical or different, represent a group chosen from a hydrogen atom, a hydrocarbon-based group comprising from 1 to 30 carbon atoms, optionally substituted with one or more groups chosen from:
• a hydroxyl, a group —OJ or —C(O)—O—J with J being a hydrocarbon-based group comprising from 1 to 24 carbon atoms;
• with at least one second monomer M5 of general formula (V):
• in which:
• R12 is chosen from the group formed by —H, —CH3 and —CH2—CH3;
• R13 is chosen from the group formed by a C6-C18 aryl, a C6-C18 aryl substituted with a group R′13, —C(O)—O—R′13;
• —S—R′13, —C(O)—N(H)—R′13 with R′13 being a C1-C30alkyl group,
• and wherein the mass ratio between copolymer A1 and compound A2 (ratio A1/A2) ranges from 0.05 to 20.