Liquid hydrocarbon copolymers having two cyclocarbonate ether end groups

Hydrocarbon-based copolymer P comprising two end groups Fl and F2 of cyclocarbonate and similar type, having the respective formulae:

• in which:
• g and d, which may be identical or different, represent an integer equal to 1, 2 or 3;
• and
• G and D are two monovalent radicals such that the pair (G, D) is chosen from pairs as follows:
• (G1, D1) of formulae:
• in which A1 is an alkylene group comprising from 1 to 9 carbon atoms;
• (G2, D2) of formulae:
• in which A2 is an alkylene group comprising from 1 to 9 carbon atoms;
• (G3, D3) of formulae:
• (G4, D4) of respective formulae:
• in which:
• A3 and A4, which may be identical or different, each represent a hydrogen atom, a linear or branched alkyl radical comprising from 1 to 6 carbon atoms, a cycloalkyl radical comprising 5 or 6 carbon atoms, a phenyl radical or an alkylphenyl group, the alkyl chain of which comprises from 1 to 4 carbon atoms;
• -A3 and A4 also possibly being bonded together to form a group —(CH2—)q— in which q is an integer ranging from 3 to 5;
• characterized in that the main chain of said copolymer P comprises:
• a unit (I) of formula (I) repeated p times, p being an integer other than 0:
• a unit (II) of formula (II) repeated n times, n being an integer other than 0:
• in which R° represents the methyl radical or one of the three radicals having the following formula:
• or
• and, optionally, a unit (III) of formula (III) repeated m times, m being an integer greater than or equal to 0:
• in which:
• R1, R2, R3 and R4, which may be identical or different, represent:
• a hydrogen or halogen atom;
• or
• a radical comprising from 1 to 22 carbon atoms which is chosen from alkyl, alkenyl, alkoxycarbonyl, alkenyloxycarbonyl, alkylcarbonyloxy, alkenylcarbonyloxy and alkylcarbonyloxyalkyl, the hydrocarbon-based chain of said radical possibly being optionally interrupted with at least one oxygen atom or one sulfur atom;
• in addition:
• at least one of the groups R1 to R4 can form, with at least one other of the groups Rl to R4 and with the carbon atom or atoms to which said groups are linked, a 3- to 10-membered, optionally substituted, saturated or unsaturated hydrocarbon-based ring or heterocycle;
• and
• at least one of the pairs (R1, R2) and (R3, R4) can form, with the carbon atom to which said pair is linked, a group of two carbon atoms linked by a double bond:
• C═C, the other carbon atom of which bears two substituents chosen from a hydrogen atom and a C1-C4 alkyl radical;
• and
• the carbon atom bearing one of the groups of the pair (R1, R2) may be linked to the carbon atom bearing one of the groups of the pair (R3, R4) by a double bond, it being understood that, in accordance with the valency rules, only one of the groups of each of these two pairs is then present;
• R5 represents:
• an oxygen or sulfur atom, or
• a divalent radical —CH2—, —C(═O)— or —NR6— in which R6 is an alkyl or alkenyl radical comprising from 1 to 22 carbon atoms;
• it also being pointed out that:
• the bond represents a single bond or a double bond;
• F1 and F2 are each linked to one of the two ends of the main chain and to a unit (I);
• and
• n, p and m are such that the number-average molecular mass Mn of the copolymer P is within a range extending from 400 to 100 000 g/mol and its polydispersity index is within a range extending from 1.5 to 3.0.