EP3688040A1 - Liquid hydrocarbon copolymers having two cyclocarbonate ester end groups - Google Patents

Abstract

1) A hydrocarbon copolymer comprising two end groups preceded by an ester function, and selected from a 2-oxo-1,3-dioxolan-4-yl (or cyclocarbonate), a dithiocyclocarbonate, an exo-vinylene cyclocarbonate, or a 2-oxo-1,3-dioxolen-4-yl, the main chain of which comprises units (I) and (II) where R °, in particular, is the methyl radical; and the number average molecular weight Mn of which is between 400 and 100,000 g/mol; 2) a method for producing the aforementioned copolymer, comprising: (i) a step of heating a statistical bipolymer A selected from a poly(butadiene-isoprene), a poly(butadiene-myrcene) and a poly(butadiene-farnesene); followed by (ii) a step of heating the resulting product in the presence of a chain transfer agent; and 3) a use as an adhesive, in a mixture with an amino-functional compound having at least two amino groups.

Description

 LIQUID HYDROCARBON COPOLYMERS WITH TWO ESTER CYCLOCARBONATE TERMINAL GROUPS

The present invention relates to hydrocarbon polymers comprising two end groups of cyclocarbonate or similar type, their method of preparation and their use for the manufacture of coating compositions, mastics or adhesives.

 It is known to use polyurethanes to make various coating compositions, mastics or adhesives.

 These compositions may be in the form of one-component or two-component compositions. In the latter case, the reagents necessary for the synthesis of the polyurethane are stored separately, optionally in the presence of other ingredients (additives), and are intended to be mixed before use of the composition, to synthesize the polyurethane at the last moment. .

 The synthesis of polyurethanes is traditionally done by reaction of a diisocyanate with a diol.

 Now diisocyanates are toxic compounds as such, and are generally obtained from phosgene, itself very toxic by inhalation or by contact. The manufacturing process used in industry generally involves the reaction of an amine with an excess of phosgene to form an isocyanate.

 In addition, polyisocyanates are very sensitive compounds in the presence of atmospheric moisture and require taking appropriate measures to prevent their premature crosslinking, and therefore their loss of reactivity, during handling and storage (anhydrous conditions).

 The search for alternatives to the synthesis of polyurethanes, without using isocyanate (or NIPU for "Non Isocyanate PolyUrethane" in English, that is to say "polyurethane without isocyanate"), therefore represents a major challenge.

This research has been the subject of numerous studies. The most studied tracks concern the use of polymers that can react with amines or oligomers of amines to form polyurethanes or derivatives structurally close to polyurethanes, such as poly (thio) urethanes, which will be generically referred to herein as "polyurethane polymers".

 The patent application WO 2014/091 173 describes hydrocarbon polymers comprising two end groups containing 2-oxo-1,3-dioxolan-4-yl (also called cyclocarbonate) which can be obtained by ring opening polymerization by metathesis. from a cycloolefin, and in the presence of a chain transfer agent and a metathesis catalyst.

 These polymers can then react with a (poly) amine to form polyurethane-type polymers, without the use of isocyanate, and which can be used to formulate coating, sealant or adhesive compositions. However, this reaction is relatively long and remains to be improved.

 Patent application WO 2016/162627 also describes hydrocarbon polymers comprising two end-vinylene cyclocarbonate-terminated end groups which are also capable of being obtained by ring opening polymerization by metathesis from a cycloolefin, and in the presence of a chain transfer agent and a metathesis catalyst.

 Patent application WO 2016/185106 describes hydrocarbon polymers comprising two dithiocyclocarbonate (or 2-thione-1, 3-oxathiolan-4-yl) terminated end groups, which are also capable of being obtained by ring opening polymerization. by metathesis from a cycloolefin, and in the presence of a chain transfer agent and a metathesis catalyst. These latter polymers can then react with a (poly) amine to form poly (thio) urethanes without isocyanate which can also be used to formulate coating, putty or adhesive compositions.

Thus, for application as a two-component adhesive, the hydrocarbon polymer as described by these references and the amine compound, used as hardener, are each included in a component of a two-component composition which is made available to the user. . The latter thus proceeds, just at the time of use of the adhesive, the mixture of these 2 components, optionally hot, so as to obtain a liquid adhesive composition. This one is applied on at least one of two surfaces belonging to two substrates to be assembled, which are put in contact to proceed with their assembly.

 The progression of the reaction between said hydrocarbon polymer and the amine compound leads to the formation of a cohesive adhesive seal which ensures the strength of the assembly of these two substrates. This adhesive seal is therefore mainly composed of the product of said reaction, and therefore of a polyurethane or a poly (thio) urethane, depending on the case.

 However, it may be necessary to use the hydrocarbon polymer as described by these references in the form of a composition comprising other constituents, such as, for example, tackifying resins, plasticizers, adhesion promoters, one or a number of additives with a reinforcing effect, such as a mineral filler, or one or more additives to improve setting time (ie the time after which crosslinking can be considered complete) or other characteristics like the rheology or the mechanical performances (elongation, module ...).

 The hydrocarbon polymers described by the previously cited references of the prior art may be liquid, but they are then obtained from substituted cycloolefins which are difficult to access as an industrial raw material.

 Said described hydrocarbon polymers are more generally solid, and must therefore be applied hot for their mixing with the hardener.

 However, it is more convenient for the adhesives and / or sealants industry to have compositions that can be applied at room temperature by the end user and which can also be manufactured industrially, also at room temperature, by simple mixture of the hydrocarbon polymer and additional components mentioned above.

 It is therefore particularly advantageous to have, for this purpose, hydrocarbon polymers with cyclocarbonate or similar end groups which are themselves liquid at room temperature.

The object of the present invention is to propose novel polymers with two end groups of the cyclocarbonate type or the like, which remedy these drawbacks. Another object of the present invention is to provide liquid polymers at room temperature which can, after mixing with a hardener, lead to the formation of an adhesive seal having improved mechanical properties.

 Another object of the present invention is to provide liquid polymers at room temperature, the synthesis of which does not use isocyanates, and which are capable of reacting with a polyamine in a short time to form polymers. polyurethane type.

 Another object of the present invention is to provide polymers with terminations of the type cyclocarbonate or the like which are liquid, in particular of lower viscosity at ambient temperature, and which can also be manufactured by a process which implements raw materials largely. available at the industrial level.

 Another object of the present invention is to provide such polymers, which can, in addition, be manufactured industrially by a process whose exotherm is easier to control.

 It has now been found that these goals can be achieved, in whole or in part, by means of the hydrocarbon polymer described hereinafter.

Thus, the present invention relates to a hydrocarbon copolymer P comprising 2 end groups F ¹ and F ² of cyclocarbonate type and the like, having the following formulas:

and (CH ₂ ) _d -C (= O) -OD

(G) (D)

in which :

 - g and d, identical or different, represent an integer equal to 0, 1, 2 or 3; and

 G and D are 2 monovalent radicals such that the pair (G, D) is chosen from the pairs:

- G1, D1) of formulas:

(G1) (D1) in which A ¹ is an alkylene group comprising from 1 to 9 carbon atoms (G 2, D 2) of formulas:

 (G2) (D2)

wherein A ² is an alkylene group having 1 to 9 carbon atoms;

- (G3, D3) of formulas:

 (G3) (D3)

in which :

- A ³ is an alkylene group comprising from 1 to 9 carbon atoms,

- A ⁴ , A ⁵ and A ⁶ , 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 whose alkyl chain comprises from 1 to 4 carbon atoms;

 - the respective ones:

 (G4) (D4)

in which :

- A ⁸ represents a hydrogen atom or an alkyl radical, linear or branched, comprising 1 to 9 carbon atoms,

A ⁷ is an alkylene group comprising from 1 to 9 carbon atoms or a divalent radical comprising from 1 to 20 carbon atoms and which can be linear or branched, cyclic or heterocyclic with one or more heteroatoms selected from oxygen and sulfur;

 - G5, D5) of respective formulas:

 (G5) (D5)

in which :

- A ⁹ and A ¹⁰ , identical or different, each represent a hydrogen atom, an alkyl radical, linear or branched, comprising from 1 to 6 carbon atoms, a cycloalkyl radical comprising 5 or 6 carbon atoms, a phenyl radical; or an alkylphenyl group whose alkyl chain comprises from 1 to 4 carbon atoms;

A ⁹ and A ¹⁰ may further be bonded together to form a - (CH 2 -) _q - group in which q is an integer 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 different from 0:

 a unit (II) of formula (II repeated n times, n being an integer different from 0:

in which R ° represents the methyl radical or one of the 3 radicals of following formula:

 and, optionally, a unit (III) of formula (III) repeated m times, m being an integer greater than or equal to 0:

 in which :

- R ¹ , R ² , R ³ and R ⁴ , identical or different, represent:

 a hydrogen or halogen atom; or

 a radical comprising from 1 to 22 carbon atoms and chosen from alkyl, alkenyl, alkoxycarbonyl, alkenyloxycarbonyl, alkylcarbonyloxy, alkenylcarbonyloxy, alkylcarbonyloxyalkyl, the hydrocarbon chain of said radical possibly being interrupted by at least one oxygen atom or one sulfur atom; ; in addition:

at least one of the groups R ¹ to R ⁴ can form, together with at least one other group R ¹ to R ⁴ and with the carbon atom or atoms to which the said groups are connected, a saturated or unsaturated hydrocarbon ring or heterocycle, optionally substituted, and comprising from 3 to 10 members; and

at least one of the pairs (R ¹ , R ² ) and (R ³ , R ⁴ ) can form, with the carbon atom to which said pair is linked, a group of 2 carbon atoms connected by a double bond: C = C , the other carbon atom has two substituents selected from a hydrogen atom or a Ci-C ₄ alkyl; and

the carbon atom carrying one of the groups of the pair (R ¹ , R ² ) can be connected to the carbon atom carrying one of the groups of the pair (R ³ , R ⁴ ) by a double bond, it being understood that, according to the valence rules, only one of the groups of each of these 2 pairs is then present;

R ⁵ represents:

 an oxygen or sulfur atom, or

a divalent radical -Ch -, -C (= O) - or -NR ⁶ - in which R ⁶ is an alkyl or alkenyl radical comprising from 1 to 22 carbon atoms;

furthermore, that:

 the link == represents a single bond or a double bond;

- F ¹ and F ² are each connected to one of the two ends of the main chain and a pattern (I); and

 n, p and m are such that the number-average molecular weight Mn of the copolymer P is in a range of from 400 to 100,000 g / mol and its polymolecularity index is in a range from 1.5 to 3; , 0.

The various groups, radicals and letters which are included in the formulas of F ¹ and F ² and in the definition of the main chain of the copolymer P, remain throughout this text, and, in the absence of any indication to the contrary, the same meaning.

The units (I), (II) and, optionally, (III) are divalent radicals which are randomly distributed in the main chain of the copolymer P, with the exception of 2 units (I) which are directly connected to F ¹ and F ² . The copolymer P is therefore a random copolymer.

 The main chain of the copolymer P therefore comprises two or three repeating units:

 a first repetition pattern (I) repeated p times of formula (I),

 a second repeating unit (II) repeated n times of formula (II); and

a third repeated repetition unit (III) m times of formula (III), which is optional;

so that the copolymer P can be a bipolymer (presence of the 2 repeating units (I) and (II)) or a terpolymer (presence of the 3 repeating units (I), (II) and (III)). As it appears above, the terminal groups F ¹ and F ² are generally symmetrical with respect to the main chain, that is to say that they correspond substantially, with the exception of the indices g and d. .

 By "heterocycle" is meant a hydrocarbon ring which may comprise another atom than carbon in the ring chain, such as, for example, oxygen, sulfur or nitrogen atoms.

 By "terminal group" is meant a group located at one of the two ends of the main chain of the polymer.

 The term "copolymer" means a polymer resulting from the copolymerization of at least two comonomers, that is to say two chemically different monomers. The main chain of a copolymer comprises at least 2 chemically distinct repeating units.

 The term "terpolymer" means a copolymer resulting from the copolymerization of three comonomers, and whose main chain consists essentially of 3 distinct repeating units.

 It is meant by the term "bipolymer" a copolymer resulting from the copolymerization of two comonomers, and whose main chain consists essentially of 2 distinct repeating units.

 Polymolecularity index (also referred to as polydispersity index or PDI) is defined as the Mw / Mn ratio, that is to say the ratio of the weight average molecular weight to the number average molecular weight of the polymer.

 In the present text, the two average molecular weights Mn and Mw are measured by Size Exclusion Chromatography (SEC), which is also referred to as gel permeation chromatography (or the term "Size Exclusion Chromatography"). by the corresponding English acronym GPC). The calibration implemented is usually a PEG (PolyEthyleneGlycol) or PS (Polystyrene) calibration, preferably PS.

The copolymer P according to the invention is particularly homogeneous and stable in temperature and advantageously liquid at room temperature. It is advantageously at room temperature in the form of a viscous liquid whose Brookfield viscosity at 23 ° C is between 1 mPa.s and 150 Pa.s, preferably between 1 and 50 Pa.s.

 It can react with a primary and / or secondary polyamine, according to a polyaddition reaction, at a temperature of less than or equal to 80 ° C. and even at ambient temperature, to form, at the end of a reaction time advantageously reduced, a polymer polyurethane type that can constitute an adhesive seal.

 The adhesive seal thus formed has high cohesion values, in particular greater than 2 MPa. Such cohesive values allow a use of said polymer as an adhesive, for example as a seal on a usual support (concrete, glass, marble), in the field of building, or for gluing glazing in the automotive industry and naval.

 According to a preferred variant, the main chain of the copolymer P consists essentially of the repeating unit (I) of formula (I), the repeating unit (II) of formula (II) and, optionally, the repeating unit (III) of formula (III). Thus, the number of units (I), (II) and optionally (III) advantageously represents at least 90% of the total number of units constituting the main chain of the copolymer P, and even more advantageously at least 95%.

 According to a preferred variant, the main chain of the copolymer P consists essentially of the repeating unit (I) of formula (I) and of the repeating unit (II) of formula (II).

 According to a more preferred variant, the relative proportion of units of formula (I) and units of formula (II) present in the main chain of copolymer P corresponds to an excess of units of formula (I). More particularly, the number p of units (I) and the number n of units (II) are such that:

 p / (n + p) is between 45 and 95%, and

 n / (n + p) is between 5 and 55%.

These latter parameters can be determined analytically by ¹ H and ¹³ C NMR spectroscopy.

According to a first and more preferred embodiment of the copolymer P according to the invention, all the bonds which are represented in formulas (I), (II) and optionally (III) as well as in the formulas giving the meaning of R ° are carbon-carbon double bonds.

 According to this first embodiment, the main chain of the copolymer P is thus such that:

 the reason (I) also has the formula (Γ):

 the reason (II) also has formula (ΙΓ):

 in which R ° represents the methyl radical or one of the 3 radicals of following formula:

and, optionally, the unit (III) also has the formula (ΙΙΓ):

it being specified that in these formulas the bond * ~>"~ · is a single bond oriented geometrically on one side or the other with respect to the double bond (cis or trans). The corresponding units of the main chain of the copolymer P are then themselves linked by a carbon-carbon double bond.

 According to a very particularly preferred variant of this first embodiment of the invention, the main chain of the copolymer P is such that:

 on the p units of formula (Γ), p "also correspond to formula (I"), p "being an integer different from 0, less than p and such that p'Vp is greater than 0.8:

 on the n units of formula (ΙΓ), n "also correspond to formula (II") n "being an integer different from 0, less than n and such that n is greater than 0.9:

According to this embodiment, at least 80% of the units of formula (Γ) are of cis configuration, represented by formula (I "), and at least 90% of units of formula (ΙΓ) are also of cis configuration, represented by the formula (II "). The corresponding percentages can be determined by ¹ H and ¹³ C NMR.

According to another variant of this ^1st embodiment, m is equal to 0, and the main chain of P does not include a pattern of formula (ΙΙΓ).

 According to a second embodiment of the copolymer P according to the invention, all the bonds which are represented in the formulas (I), (II) and, optionally, (III) as well as in the formulas giving the meaning of R °, are simple carbon-carbon bonds.

 According to this second embodiment, the main chain of the copolymer P is therefore such that:

the unit (I) also has the formula (l ^H ): the pattern (II) also has the formula (II ^H )

 in which R ° represents the methyl radical or one of the 3 radicals of following formula:

and, optionally, the unit (III) has the formula (III ^H )

Copolymer P according to this second embodiment is for example from the hydrogenation of the copolymer P according to the embodiment ¹ described above.

 According to a still more preferred variant of each of these 2 embodiments, the radical R ° of the unit (II) represents the methyl radical.

 As regards now end groups of cyclocarbonate type and analogues of the copolymer P according to the invention, and according to a first embodiment:

F ¹ is: G ¹ -O- (O = C) - (CH 2) _g - and also has the formula: o ^ _{Al /} C ^ ci¾

(CH ₂ ) dC (= O) -O-D1 and also has the formula

corresponding to a terminal cyclocarbonate (or 2-oxo-1,3-dioxolan-4-yl) group.

According to a preferred variant of said mode, A ¹ is a methylene group. According to another preferred variant of said mode, g and d are identical and equal to 0 or 1.

 According to a second embodiment:

F ¹ is: G 2 -O- (O = C) - (CH ₂ ) _g - and also has the formula:

F ² is: - (CH 2) d C (= O) -O-D 2 and also has the formula:

corresponding to a terminal dithiocyclocarbonate (or 2-thione-1,3-oxathiolan-4-yl) group.

According to a preferred variant of said mode, A ² is a methylene group.

According to another preferred variant of said mode, g and d are identical and equal to 0 or 1.

 According to a third embodiment:

F ¹ is: G 3 -O- (O = C) - (CH ₂ ) _g - and also has the formula:

F ² is: - CH ₂ ) _d -C (= O) -O- _{D 3} and also has the formula

corresponding to a terminal group exo-vinylene cyclocarbonate.

According to a preferred variant of said mode, A ³ is a - (CH 2) 2 - group, A ⁴ is a hydrogen atom and A ⁵ and A ⁶ are each a methyl.

 According to another preferred variant of said mode, g and d are identical and equal to 0 or 1.

 According to a fourth embodiment:

F ¹ is: G 4 -O- (O = C) - (CH 2) _g - and also has the formula:

 CH2) d-C (= O) -O-D4 and also has the formula

corresponding to a terminal group exo-vinylene cyclocarbonate. According to a preferred variant of said mode, A ⁷ is a propylene group and A ⁸ is a methyl.

According to another preferred variant of said mode, g and d are identical and equal to 0 or 1. According to a fifth embodiment:

F ¹ is: G 5 -O- (O = C) - (CH 2) _g - and also has the formula:

 (CH2) d-C (= O) -O-D5 and also has the formula

corresponding to a terminal group 2-oxo-1,3-dioxol-4-yl.

According to a preferred variant of said mode A ⁹ is a hydrogen atom and A ¹⁰ is a methyl.

 According to another preferred variant of said mode, g and d are identical and equal to 0 or 1.

 The invention also relates to a process for preparing the hydrocarbon-based copolymer P as defined above, said process comprising:

 (i) a step of heating at a temperature ranging from 30 ° C to 80 ° C:

(a) a random bipolymer A selected from poly (butadiene-isoprene), poly (butadiene-myrcene) and poly (butadiene-farnesene); and

 (b) optionally, in the presence of a compound B of formula (B):

 then

(ii) a step of heating the product formed in step (i) to a temperature in a range of 20 to 60 ° C, in the presence of a chain transfer agent (also known as CTA), being specified that : (c) when said hydrocarbon copolymer P is such that the pair (G, D) is (G1, D1), (G3, D3), (G4, D4), or (G5, D5), then said CTA is a compound of formula (C1) or (C2):

 (C1) (C2)

in which :

F ¹ and F ² are such that the pair (G, D) corresponds to the corresponding definition (G1, D1), (G3, D3), (G4, D4), or (G5, D5);

 the bond is a single carbon-carbon bond oriented geometrically on one side or the other with respect to the double bond (cis or trans); and

(d) when said hydrocarbon copolymer P is such that the pair (G, D) is (G2, D2), then said di-epoxidized compound of formula (C'1) or (C'2):

 (C'1) (C'2)

in which :

- F ' ¹ e and F' ² e are the monovalent radicals of formulas (G ') and (D'):

 (G ') (D')

 the bond is a single carbon-carbon bond oriented geometrically on one side or the other with respect to the double bond (cis or trans); it being further specified that each of steps (i) and (ii) is carried out in the presence of a metathesis catalyst and a solvent;

 then

(iii) when said hydrocarbon-based copolymer P is such that the pair (G, D) is (G2, D2), a dithiocarbonation stage of the polymer obtained in stage (ii), by reaction with carbon disulphide (CS2) in the presence of a halogenated lithium compound, at a temperature ranging from 10 to 45 ° C. Each of steps (i), (ii) and (iii) is described below in more detail. Step (i):

 Step (i) implements a depolymerization reaction of the bipolymer

A and intramolecular cydization, which leads to the formation of one or more macrocyclic O cooligomer comprising:

 the unit of formula (Γ) repeated p 'times, p' ° being an integer different from 0;

the unit of formula (ΙΓ) repeated n 'times, n' ° being an integer different from 0; and, optionally, the unit of formula (ΙΙΓ) repeated m ' ⁰ times, m' ⁰ being an integer greater than or equal to 0;

it being specified that p '°, n' ° and m ' ⁰ are such that the number-average molecular mass Mn of the cyclic cooligomer (s) O is in the range from 162 to 5000 g / mol, preferably from 1000 to 3000 g / mole.

 The formation and structure of the O-macrocyclic cooligomer (s) can be characterized by steric exclusion chromatography (SEC) and mass spectrometry techniques. The distribution in the macrocycle of the units of formulas (Γ), (ΙΓ) and optionally (ΙΙΓ) is statistical.

 A preferred temperature range for heating the bipolymer A and optionally compound B according to step (i) is from 30 ° C to 60 ° C.

 The corresponding heating time is adapted to obtain a yield close to 100% relative to the molar amount of bipolymer A used, as well as that of the other reactants present. A time ranging from 1 hour to 8 hours, preferably from 1 to 3 hours, is generally suitable.

Bipolymer A:

 Bipolymer A is a copolymer consisting essentially of 2 monomers and is selected from poly (butadiene-isoprene), poly (butadiene-myrcene), and poly (butadiene-farnesene).

According to a first variant, which is particularly preferred, of the process according to the invention, the bipolymer A used in step (i) is a poly (butadiene) isoprene). Advantageously, a hydrocarbon-based copolymer P according to the invention is obtained:

 or at the end of step (ii) when P is such that the pair (G, D) is (G1, D1), (G3, D3), (G4, D4), or (G5, D5) ,

 or at the end of step (iii) when P is such that the pair (G, D) is (G2,

D2).

 The main chain of P comprises according to this same variant:

 the repeating pattern of formula (Γ) and

 the repeating unit of formula (ΙΓ) in which R ° represents the methyl radical.

 Poly (butadiene-isoprene) are copolymers which constitute an industrially advantageous raw material, in particular because of their availability and properties in terms of industrial hygiene. Polybutadiene-isoprene is generally obtained by various polymerization processes:

- 1, 3-butadiene of the formula: H ₂ C = CH-CH = CH _2, and

 2-methylbuta-1,3-diene (or isoprene), of formula:

H ₂ C = C (CH ₃ ) -CH = CH ₂ .

 The polymerization of 1,3-butadiene can be carried out in either a 1,4-trans-addition or a 1,4-cis-addition, resulting in a repeating unit in the copolymer chain (referred to as a trans-butadiene unit, respectively). 1, 4 and cis-1, 4), which is in the form of the two geometric isomers of the respective formula: tif butadiene trans-1, 4)

 (butadiene cis-1,4)

The cis-1,4 butadiene unit is identical to the unit of formula (I ") defined previously.

The polymerization of 1,3-butadiene can also be carried out according to a 1,2-addition, resulting in a repeating unit in the copolymer chain (designated 1,2-vinyl-butadiene unit) which has the formula:

 (butadiene vinyl-1,2)

 Thus, poly (butadiene-isoprene) generally comprises in its chain the 3 repeating units above, hereinafter referred to generically as "butadiene derived units".

Similarly, the polymerization of isoprene can be carried out according to a trans-addition-1, 4 or a cis-addition-1, 4, resulting in a repeating unit in the copolymer chain (designated respectively by trans isoprene unit -1, 4 and cis-1, 4), which is in the form of the two geometric isomers of the following formulas: trans-1, 4 trans-isoprene

 (Isoprene unit cis-1, 4)

 The cis-1,4 isoprene unit is identical to the unit of formula (II ") in which R ° is methyl, as defined above.

 The polymerization of isoprene can also be carried out in an addition-1, 2, resulting in a repeating unit in the copolymer chain (designated by isoprene vinyl-1, 2 unit) which has the formula:

 (isoprene vinyl-1 unit, 2)

The polymerization of isoprene can finally be carried out according to a 3,4-addition, resulting in a repeating unit in the copolymer chain (designated by 3,4-vinyl isoprene unit) which has the formula:

 (isoprene vinyl-3,4 unit)

 Thus, polybutadiene-isoprene generally comprises in its chain the 4 repeating units above, hereinafter referred to generically as "isoprene derived units".

 The poly (butadiene-isoprene) used in step (i) may have a number-average molecular weight (Mn) ranging from 3,000 to 100,000 g / mol, preferably from 3,000 to 50,000 g / mol, and a glass transition temperature (Tg) of from -1 to -60 ° C.

 It preferably comprises from 45 to 95% of number of units derived from butadiene and from 5 to 55% of number of units derived from isoprene, said percentages being expressed on the basis of the total number of constituent units of the poly chain. (butadiene-isoprene).

 Preferably, the poly (butadiene-isoprene) chain implemented in step (i) comprises:

 less than 5% number of butadiene vinyl-1,2 units, on the basis of the number of units derived from butadiene, and

 less than 5% of the total number of isoprene vinyl-1, 2 units and isoprene vinyl-3,4 units, based on the number of units derived from isoprene.

 Even more preferably, this double upper limit of 5 mol% is lowered to 2%.

 According to another variant, very particularly preferred, the poly (butadiene-isoprene) chain implemented in step (i) comprises:

 at least 80% of cis-1,4-butadiene units, based on the number of units derived from butadiene, and

 at least 90% of cis-1,4 isoprene units, based on the number of units derived from isoprene.

According to this latter variant, such a poly (butadiene-isoprene), which is liquid at ambient temperature, is often described as "high content of butadiene cis-1,4 and isoprene cis-1,4" units and is still designated , in English, by terms of "high cis poly (butadiene-isoprene)". Advantageously, either at the end of step (ii) or at the end of step (iii) depending on the meaning of the pair (G, D) as specified above, the preferred variant of the copolymer is advantageously obtained. P corresponding to the presence of the units of formula (I ") and (II"), as defined above.

 Percentages in numbers of butadiene vinyl-1,2-units, isoprene vinyl-

1, 2, isoprene vinyl-3,4, butadiene cis-1,4 and isoprene cis-1,4 defined above can be determined by NMR of ¹ H and ¹³ C.

 An example of such poly (butadiene-isoprene) is KURAPRENE® LIR-390 which is commercially available from KURARAY.

 This liquid poly (butadiene-isoprene) has a number-average molecular weight (Mn) of 48,000 g / mole. It comprises 92% number of units derived from butadiene and 8% number of units derived from isoprene, said percentages being expressed on the basis of the total number of units derived from butadiene and isoprene constituting the chain.

 It also includes:

 on the basis of the number of units derived from butadiene, about 1% by number of butadiene vinyl-1,2 units, and

 based on the number of units derived from isoprene, about 1% number of isoprene vinyl-1,2 units and less than 1% number of isoprene vinyl-3,4 units.

 He finally understands:

 about 85% of cis-1,4 butadiene units, based on the number of units derived from butadiene, and

 approximately 98% of cis-1,4 isoprene units, based on the number of units derived from isoprene.

 Another example of poly (butadiene-isoprene) is KURAPRENE® LIR-340, also commercially available from KURARAY.

This poly (butadiene-isoprene) has a number-average molecular weight (Mn) of 34,000 g / mole. It comprises 46% of number of units derived from butadiene and 54% of number of units derived from isoprene, said percentages being expressed on the basis of the total number of constituent units of the chain. It has, moreover, the same characteristics as those indicated above for the KURAPRENE® LIR-390.

 According to a second variant of the process according to the invention, the bipolymer A is either a poly (butadiene-myrcene) or a poly (butadiene-farnesene).

 Myrcene is a naturally occurring organic compound belonging to the chemical class of monoterpenes and is an important intermediate in the perfume industry. It is produced semi-synthetic from plants of the genus Myrcia. It is in the form of two geometric isomers:

the α-m rcene, of structural formula:

β-myrcene, of structural formula:

Farnesene or β-farnesene is a natural isoprenoid compound that can be chemically synthesized by isoprene oliogomerization or by dehydration of neridol. It is used mainly as perfume or intermediate and meets the developed formula:

 Reference is made to application EP 2810963 for the processes for the preparation of copoly (butadiene-myrcene) and copoly (butadiene-farnesene).

 In this second variant (either at the end of step (ii) or at the end of step (iii) depending on the meaning of the pair (G, D) as specified above), a copolymer is obtained hydrocarbon P according to the invention, the main chain of which comprises:

 the repeating pattern of formula (Γ) and

 the repeating unit of formula (ΙΓ) in which R ° represents:

the radical of formula: - (C¾) ₃

CH ₃

corresponding to Γα-myrcene;

corresponding to β -myrcene; or

 corresponding to β-farnesene. Compound of formula (B):

 The implementation in step (i) of the compound of formula (B) advantageously leads to obtaining copolymers P according to the invention, the main chain comprises the additional unit of formula (ΙΙΓ), as defined above.

 The compound of formula (B) generally comprises from 6 to 30, preferably from 6 to 22, carbon atoms.

 Preferably:

R ¹ , R ² , R ³ and R ⁴ represent a hydrogen atom or an alkyl or alkoxycarbonyl radical comprising from 1 to 14 carbon atoms, and even more preferably from 1 to 8;

the radical R ⁶ , included in the group -NR ⁶ which is one of the meanings of R ⁵ , is a linear radical comprising from 1 to 14 carbon atoms.

According to an even more preferred variant: at most one of the groups chosen from (R ¹ , R ² , R ² and R ⁴ ) is a C 1 -C 6 alkoxycarbonyl radical and all the others represent a hydrogen atom; and or

- R ⁵ represents a radical -CH 2 - or an oxygen atom.

 The compound of formula (B) is in particular chosen from:

norbornene, of the following formula:

norbornadiene, of the following formula:

dic clopentadiene, of the following formula:

7-oxanorbornene, of the following formula:

7-oxanorbornadiene, of the following formula: 5-Ethidene-2-norbornene, of the following formula:

or else 5-norbonene-2-methylacetate, of the following formula:

The compound of formula (B) may also be chosen from the following compounds:

in which R is an alkyl radical comprising from 1 to 22 carbon atoms, preferably from 1 to 14 carbon atoms.

The compound of formula (B) can also be chosen from the group formed by the addition products (or adducts in English) resulting from the Diels-Alder reaction. using cyclopentadiene or furan as starting material, as well as compounds derived from norbornene, such as branched norbornenes as described in WO 2001/04173 (such as: isobornyl norbornene carboxylate, phenyl norbornene carboxylate, norbornene ethylhexyl carboxylate) , phenoxyethyl norbornene carboxylate and alkyl norbornene dicarboxymide, alkyl having most often from 3 to 8 carbon atoms) and substituted norbornenes as described in WO 201 1/038057 (dicarboxylic anhydrides of norbornene and optionally dicarboxylic anhydrides of 7- oxanorbornène).

 Of the various compounds of formula (B) mentioned, norbornene and dicyclopentadiene are particularly preferred.

Step (ii):

 The macrocyclic cooligomers O corresponding to the product formed in step (i) are polymerized by heating at a temperature in a range of 20 to 60 ° C, in the presence of a chain transfer agent (also known as CTA).

For the preparation of a hydrocarbon copolymer P such that the pair (G, D) is (G1, D1), (G3, D3), (G4, D4) or (G5, D5), then said CTA is a compound of formula (C1) or (C2):

 (C1) (C2)

in which :

F ¹ and F ² are such that the pair (G, D) corresponds to the corresponding definition (G1,

D1), (G3, D3), (G4, D4), or (G5, D5);

the bond is a single carbon-carbon bond oriented geometrically on one side or the other with respect to the double bond (cis or trans).

 In this case, a hydrocarbon-based copolymer P according to the invention is obtained directly after step (ii).

 When a CTA of formula (C1) is used, the process

corresponding is often referred to as "monofunctional CTA route". When a CTA of formula (C2) is used, the corresponding process is often referred to as

"CTA path difunctional". For the preparation of a hydrocarbon copolymer P such that the pair (G, D) is (G2, D2), then the said di-epoxidized compound of formula (C'1) or (C'2):

 (C'1) (C'2)

in which :

- F ' ¹ e and F' ² e are the monovalent radicals of formulas (G ') and (D'):

(G ¹ ) (D ')

 - The bond * ~> "~ · is a single bond carbon-carbon oriented geometrically on one side or the other with respect to the double bond (cis or trans).

In this case, an intermediate hydrocarbon-based copolymer I comprising the two terminal groups F ' ¹ e and F' ² e and whose main chain is identical to that of the copolymer P according to the invention, is obtained directly at the end of step (ii). 'invention. Formula CTA (CD or (C2):

CTA of formulas (CD or (C2) in which the pair (G, D) is (G1,

DP:

According to a first embodiment (monofunctional CTA route), the CTA has the formula (C1) in which F ² is such that D is D1.

 Said CTA then has the formula:

This compound can be manufactured according to the procedure described in patent application EP 0,683,163 in the name of MITSUBISHI GAS CHEMICAL or according to the procedure described in Polymer Chemistry, 2013, 4, 1313-1316 by L.Annunziata, S.Fouquay, G.Michaud , F.Simon, S.Guillaume and JF.Carpentier. According to a preferred variant of this embodiment, d equals 0.

According to another preferred variant of this embodiment, A ¹ is a methylene group.

 The CTA corresponding to the combination of these two preferred variants has the formula:

and is hereinafter referred to as CTA ¹ .

According to a second embodiment (difunctional CTA path), the CTA has the formula (C2) in which F ¹ and F ² are such that the torque (G, D) is (G1, D1).

 The CTA then has the formula:

 This compound can be manufactured according to the procedure described in Polymer Chemistry, 2013, 4, 1313-1316 by L.Annunziata, S.Fouquay, G.Michaud, F.Simon, S.Guillaume and JF.Carpentier in which acrylic acid has been replaced by the carboxylic acids corresponding to the present invention.

 According to a preferred variant of this embodiment, g = 1 or d = 1, and even more preferably: g = d = 1.

According to another preferred variant of this embodiment, A ¹ is a methylene group.

 The CTA corresponding to the combination of these two preferred variants has the formula:

0 and is hereinafter referred to as CTA ² .

CTA of formulas (CD or (C2) in which the pair (G, D) is (G3,

D3):

According to a first embodiment (monofunctional CTA route), the CTA has the formula (C1) in which F ² is such that D is D3.

 Said CTA then has the formula:

This compound can be manufactured according to the procedure described in patent application WO 2013/144299 in the name of BASF and WO 2016/185106 in the name of BOSTIK.

 According to a preferred variant of this embodiment, d equals 0.

According to other preferred variants of this embodiment:

- A ³ is a group - (CH2) 2-, and / or

- A ⁴ is a hydrogen atom, and / or

A ⁵ and A ⁶ are each a methyl radical.

 The CTA corresponding to the combination of these last 4 preferred variants has the formula:

and is hereinafter referred to as CTA ³ .

According to a second embodiment (difunctional CTA path), the CTA has the formula (C2) in which F ¹ and F ² are such that the torque (G, D) is (G3, D3).

Said CTA then has the formula:

This compound can be manufactured according to the procedure described in the patent application WO 2016/162627 in the name of BOSTIK.

 According to a preferred variant of this embodiment, g = 1 or d = 1, and even more preferably: g = d = 1.

 According to other preferred variants of this embodiment:

- A ³ is a group - (CH2) 2-, and / or

- A ⁴ is a hydrogen atom, and / or

A ⁵ and A ⁶ are each a methyl radical.

 The CTA corresponding to the combination of these 4 preferred variants has the formula:

and is hereinafter referred to as CTA ⁴ .

CTA of formulas (CD or (C2) in which the pair (G, D) is (G4,

D4):

According to a first embodiment (monofunctional CTA route), the CTA for formula (C1) in which F ² is such that D is D4.

 The CTA then has the formula:

This compound can be manufactured according to the procedure described in the patent application WO 2016/169858 in the name of BASF.

 According to a preferred variant of this embodiment, d equals 0. According to other preferred variants of this embodiment:

- A ⁷ is a propylene radical, and / or

- A ⁸ is a methyl radical.

 The CTA corresponding to the combination of these 3 preferred variants has the formula:

and is hereinafter referred to as CTA ⁵ .

According to a second embodiment (difunctional CTA path), the CTA has the formula (C2) in which F ¹ and F ² are such that the torque (G, D) is (G4, D4).

 Said CTA then has the formula:

This compound may be manufactured according to the procedure described in the patent application WO 2016/169858 of BASF in which the acrylic acid has been replaced by the dicarboxylic acids corresponding to the present invention.

 According to a preferred variant of this embodiment, g = 1 or d = 1, and even more preferably: g = d = 1.

 According to other preferred variants of this embodiment:

- A ⁷ is a propylene radical, and / or

- A ⁸ is a methyl radical.

The CTA corresponding to the combination of these 3 preferred variants has the formula: and is hereinafter referred to as CTA ⁶ .

CTA of formulas (CD or (C2) in which the pair (G, D) is (G5,

D5):

According to a first embodiment (monofunctional CTA route), the CTA has the formula (C1) in which F ² is such that D is D5.

 The CTA then has the formula:

 According to a preferred variant of this embodiment, d equals 0.

According to other preferred variants of this embodiment:

- A ⁹ is a hydrogen atom, and / or

- A ¹⁰ is a methyl radical.

 The CTA corresponding to the combination of these 3 preferred variants has the formula

and is hereinafter referred to as CTA ⁷ .

According to a second embodiment (difunctional CTA path), the CTA has the formula (C2) in which F ¹ and F ² are such that the torque (G, D) is (G5, D5).

Said CTA then has the formula:

According to a preferred variant of this embodiment, g = 1 or d = 1, and even more preferably: g = d = 1.

 According to other preferred variants of this embodiment:

- A ⁹ is a hydrogen atom, and / or

- A ¹⁰ is a methyl radical.

 The CTA corresponding to the combination of these two preferred variants has the formula:

and is hereinafter referred to as CTA ⁸ .

The compounds corresponding to the general formulas of these last two embodiments can be obtained according to the procedure described in patent application US Pat. No. 7,041,820 to Nippon Sodsa and Daiichi Asubio PHARMA by reacting, in a solvent medium and in the presence of a catalyst. phase transfer agent (for example a metal iodide), an alkali metal salt of mono or dicarboxylic acid with a precursor of 4-halomethyl-5-alkyl-1,3-dioxolen-2-one type:

In the diagram above:

Q is a radical mono (f equals 1) or divalent (f equals 2) of respective structures:

 X is a chlorine or bromine atom.

 The precursor of the 4-halogenomethyl-5-alkyl-1,3-dioxenol-2-one type can be obtained by following the procedures described in KANEBO EP 0,078,413.

CTA of formulas (CD or (C'2) set for the preparation of the copolymer P such that the pair (G, D) is (G2, D2)

According to a first embodiment (monofunctional CTA route), the CTA has the formula (C'1) which, taking into account the meaning of F ' ^2e , can also be represented by the following general formula:

 This compound can be manufactured according to the procedure described in the patent application CN 102,757,409 in the name of HUNAN ROCKET CHEMICAL MATERIALS or the patent application EP 0,683,163 in the name of MITSUBISHI GAS CHEMICAL.

 According to a preferred variant of this embodiment, d equals 0.

According to another preferred variant of this embodiment, A ² is a methylene group.

The CTA corresponding to the combination of these two preferred variants has the formula:

and is hereinafter referred to as CTA ^' 9

According to a second embodiment (CTA mode difunctional), the CTA has the formula (C'2) which, given the significance of F ' ¹ e and F' ² e, can also be represented by the following general formula:

 O Q

⁰ o

 This compound can be manufactured according to the procedure described in the patent application EP 0,336,670 in the name of HOECHST in which the muconic acid has been replaced by the dicarboxylic acids corresponding to the present invention.

 According to a preferred variant of this embodiment, g = 1 or d = 1, and even more preferably: g = d = 1.

According to another preferred variant of this embodiment, A ² is a methylene group. The CTA corresponding to the combination of these two preferred variants has the formula:

and is hereinafter referred to as CTA 10

Without being bound by any reaction mechanism, it is believed that step (ii) implements macrocycle O opening polymerization and CTA cross-metathesis.

 This step (ii) advantageously has a low exothermicity, so that the industrial implementation of the method according to the invention does not pose difficulties in controlling the temperature.

 The molar amount of CTA to be introduced in the present step (ii) is related to the molar amount of bipolymer A and, optionally, to the molar amount of compound B introduced in step (i).

 These molar quantities are such that the ratio r which is equal to the ratio of the number of moles of said CTA:

 at the number N (A) of moles of the bipolymer A, in the case where said bipolymer A is the only reagent implemented in step (i), or

 to the sum of N (AJ) and the number of N moles (BJ of the compound of formula (B), in the case where the compound of formula (B) is also used in step (i),

 is in the range of 0.0010 to 1.0.

 Thus, when according to a preferred variant of the process according to the invention, the bipolymer A is a poly (butadiene-isoprene), said ratio r is equal to the ratio of the number of moles of the CTA:

at the number N (A) of moles of said polybutadiene-isoprene, in the case where said polybutadiene-isoprene is the only reagent used in step (i), or to the sum of N (AJ) and the number of N moles (BJ of the compound of formula (B), in the case where the compound of formula (B) is also used in step (i).

 Even more preferably, the ratio r defined above is in the range of 0.0020 to 0.3.

Metathesis catalyst and solvent used in steps (i) etliil:

 Steps (i) and (ii) of the process according to the invention each implement a metathesis catalyst and a solvent which may be identical or different, and preferably identical in each of these two steps.

 The metathesis catalyst is preferably a catalyst comprising ruthenium, and even more preferably a Grubbs catalyst,

 Such a catalyst is generally a commercial product.

 The metathesis catalyst is most often a transition metal catalyst including a catalyst comprising ruthenium most often in the form of complex (s) of ruthenium such as a ruthenium-carbene complex.

By Grubbs catalyst is generally defined according to the invention a Grubbs catalyst 1 ^st or 2 ^nd generation, but also any other Grubbs catalyst (such as ruthenium carbene) or Hoveyda-Grubbs accessible to the skilled person , such as for example the substituted Grubbs catalysts described in US Pat. No. 5,849,851.

A Grubbs catalyst 1 ^st generation is generally of the formula (G1):

wherein Ph is phenyl, Cy is cyclohexyl, and P (Cy) 3 is a tricyclohexylphosphine group.

The IUPAC name for this compound is: benzylidene-bis (tricyclohexylphosphine) dichlororuthenium (CAS number: 172222-30-9). Such a catalyst is available in particular from Aldrich. A preferred catalyst is the ^2nd generation Grubbs catalyst is generally of formula (G2):

 (G2) wherein Ph is phenyl and Cy is cyclohexyl.

 The IUPAC name of the second generation of this catalyst is benzylidene [1,3-bis (2,4,6-trimethylphenyl) -2-imidazolidinylidene] dichloro (tricyclohexylphosphine) ruthenium (CAS number: 246047-72-3). This catalyst is also available from Aldrich.

 The solvent is generally chosen from the group formed by the aqueous or organic solvents typically used in the polymerization reactions and which are inert under the conditions of the polymerization, such as aromatic hydrocarbons, chlorinated hydrocarbons, ethers, aliphatic hydrocarbons, alcohols, water or their mixtures.

 A preferred solvent is selected from the group consisting of benzene, toluene, para-xylene, methylene chloride (or dichloromethane), 1,2-dichloroethane, dichlorobenzene, chlorobenzene, tetrahydrofuran, diethyl ether, pentane, hexane, heptane, a mixture of liquid isoparaffins (for example Isopar®), methanol, ethanol, water or their mixtures.

 Even more preferably, the solvent is selected from the group consisting of benzene, toluene, paraxylene, methylene chloride, 1,2-dichloroethane, dichlorobenzene, chlorobenzene, tetrahydrofuran, diethyl ether, pentane, hexane, heptane, methanol, ethanol or mixtures thereof.

Even more particularly preferably, the solvent is dichloromethane, 1,2-dicholoroethane, toluene, heptane or a mixture of toluene and 1,2-dichloroethane. It is also possible that each of the steps (i) and (ii) is carried out without solvent.

 The main chain of the hydrocarbon copolymer P according to the invention which is obtained directly after steps (i) and (ii) is unsaturated, and, more precisely, comprises - according to the first embodiment described above for said copolymer - a repeating unit (I) of formula (Γ), a repeating unit (II) of formula (ΙΓ) and, optionally, a repeating unit (III) of formula (ΙΙΓ). Step (iii):

According to the process for preparing a hydrocarbon-based copolymer P such that the pair (G, D) is (G2, D2), it is used in stage (ii), ie the monoepoxidized CTA of formula (C'1) or di-epoxidized CTA of formula (C'2). In this case, directly at the end of step (ii), an intermediate hydrocarbon copolymer I comprising the two terminal groups F ' ¹ e and F' ^2e , of the respective formulas (G ') and (D'), is obtained in this case. and whose main chain is identical to that of the copolymer P according to the invention.

 Said intermediate copolymer I is then reacted, according to the present step (iii), according to a dithiocarbonation reaction with carbon disulfide (CS2) in the presence of a halogenated lithium compound, at a temperature ranging from 10 to 45 ° C. .

 At the end of this reaction, the hydrocarbon-based copolymer P such that the pair (G, D) is (G 2, D 2) is then obtained. The process for the preparation of the hydrocarbon copolymer P which has just been described may also comprise, besides the steps (i) and (ii) (and, where appropriate, (iii)), an additional step of hydrogenation of the double bonds.

This step is generally carried out by catalytic hydrogenation, most often under hydrogen pressure and in the presence of a hydrogenation catalyst such as a palladium catalyst supported by carbon (Pd / C). It more particularly makes it possible to obtain for the hydrocarbon copolymer P - according to the second embodiment previously described for said copolymer - a main chain which is saturated, and which therefore comprises a repeating unit (I) of formula (I ^H ) repeated once, a unit (II) of formula (II ^H ) repeated n times and, optionally, a unit (III) ) of formula (III ^H ) repeated m times.

 Finally, according to a preferred variant of the process for preparing the hydrocarbon-based copolymer P, the CTA used in step (ii) is a difunctional CTA of formula (C2) or (C'2). Said P copolymer is then obtained in an improved yield.

 The invention also relates to the use as adhesive of the hydrocarbon copolymer comprising two end groups of cyclocarbonate type or the like, as defined above, in a mixture with an amine compound comprising at least two amino groups, for example chosen from diamines, triamines and higher homologs. The amounts of the hydrocarbon polymer and the amine compound correspond to stoichiometric amounts, that is to say that the molar ratio of the number of cyclocarbonate groups (or the like) to the number of amine groups ranges from 0.8 to 1.2. preferably from 0.9 to 1.1 or even about 1.0.

 In practice, the hydrocarbon polymer and the amine compound, used as hardener, are advantageously each comprised in a component of a two-component composition which is made available to the user. The latter thus proceeds, at the time of use of the adhesive, to the mixing of these 2 components, optionally at a temperature, so as to obtain a liquid adhesive composition of suitable viscosity.

 The invention also relates to a method of assembling two substrates by gluing, comprising:

 coating on at least one of the two substrates to be assembled with a liquid adhesive composition obtained by mixing an amine compound comprising at least two amino groups with the hydrocarbon polymer comprising two end groups of cyclocarbonate or similar type as defined above ; then

 the effective contact of the two substrates.

The liquid adhesive composition is either the adhesive composition comprising said compound and polymer in the liquid state at room temperature, or the hot melt adhesive composition. Those skilled in the art are able to proceed so that the adhesive composition used is in a liquid form and at an appropriate viscosity, at the time of its use.

 The coating of the liquid adhesive composition is preferably made in the form of a layer of thickness in a range of 0.3 to 5 mm, preferably 1 to 3 mm, on at least one two surfaces which belong respectively to the two substrates to be assembled, and which are intended to be brought into contact with one another according to a tangent surface. The effective contact of the two substrates is then implemented according to their tangency surface.

 Of course, the coating and the contacting must be carried out within a compatible time interval, as is well known to those skilled in the art, that is to say before the adhesive layer applied to the substrate does not lose its ability to fix by bonding this substrate to another substrate. In general, the polycondensation of the hydrocarbon polymer with the amino compound begins to occur during the coating, and then continues to occur during the step of contacting the two substrates.

 Suitable substrates are, for example, inorganic substrates such as glass, ceramics, concrete, metals or alloys (such as aluminum alloys, steel, non-ferrous metals and galvanized metals); or organic substrates such as wood, plastics such as PVC, polycarbonate, PMMA, polyethylene, polypropylene, polyesters, epoxy resins; metal substrates and paint-coated composites (as in the automotive field).

 The following examples are given purely by way of illustration of the invention, and can not be interpreted to limit its scope.

 The copolymers P illustrated have a Brookfield viscosity at 23.degree.

50 Pa.s.

EXAMPLE 1 depolymerization / cyclization by heating of a poly (butadiene-isoprene) followed by hot cross-metathesis in the presence of CTA ¹ (monofunctional CTA) and obtaining of a copolymer P such that (G, D) is (G1, D1): KURAPRENE® LIR-390 as defined above is used as liquid poly (butadiene-isoprene) and CTA ¹ of the formula:

(CTA ¹ )

 Step (i):

Poly (butadiene-isoprene) (81.00 mmol), benzoquinone (0.54 mmol) and dry CH 2 Cl 2 (9 ml) are introduced into a 20 ml flask in which a magnetic stirring bar has also been placed. stirring coated with Teflon ^® . The balloon and its contents are then put under argon.

 Then the addition of a G2 catalyst previously defined (9.6 μιτιοΙ) in solution in CH 2 Cl 2 (2 ml) is carried out by means of a cannula.

 This mixture is heated in an oil bath for 3 hours at 40 ° C with stirring until disappearance of KURAPRENE® LIR-390 and formation of a mixture of macrocyclic cooligomers O attested by steric exclusion chromatography.

 Step (ii):

The compound CTA ¹ (0.27 mmol) is added by syringe and with stirring into the mixture contained in the flask of step (i) and the temperature of 40 ° C. is maintained by heating.

 The ratio r, as defined previously, is: 0.27 / 81, 00 is 0.003

After 8 hours from the introduction of CTA ¹ , the product present in the flask is removed after evaporation of the solvent in vacuo. This product is then recovered in the form of a colorless liquid, after precipitation in methanol, filtration and drying at 23 ° C. under vacuum, with a yield greater than 90%.

 1 H / 13 C NMR analysis gives the following results:

¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH3) cis and trans / isoprene unit), terminal group = 2.25 (m, OC (O) -O -CH-CH ₂ -OC (O) -CH = CH- CH ₂ ), 2.90 (d, OC (O) -O-CH-CH ₂ -OC (O) -CH = CH-CH ₂ ), 4.30 and 4.63 (m, OC (O) -O-CH 2 CH-CH ₂ -OC (O) -CH = CH), 4.96 (m, OC (O) -O-CH-CH ₂ -OC (O) -CH = CH), 5.87 (m, OC (O ) -O-CH-CH ₂ -OC (O) -CH = CH-), 7.02 (m, OC (O) -O-CH-CH ₂ -OC (O) -CH = CH).

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 62.80 and 66.0 OC (O) -O-CH ₂ -CH-CH ₂ -OC (O) -CH = CH, 74.1 OC (O) -O-CH-CH ₂ -OC (O) -CH = CH, 122.2 O-C (O) - O-CH-CH ₂ -OC (O) -CH = CH, 50.9 OC (O) -O-CH-CH ₂ -OC (O) -CH = CH, 154.7 OC (O) -O-CH-CH ₂ -OC (O) -CH = CH, 166.5 OC (O) -O-CH-CH ₂ -OC (O) -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

 - of the unit (I) of formula:

 - of the unit (II) of formula:

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

The number-average molecular weight Mn and the polydispersity index are respectively 17 020 g / mol and 2.7. EXAMPLE 2 depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ² (difunctional CTA route), and obtaining of a copolymer P such that (G, D) is (G1, D1):

Example 1 is repeated without adding benzoquinone in step (i), and replacing in step (ii) as a chain transfer agent, CTA ¹ by CTA ² , of formula:

A polymer in the form of a colorless liquid whose NMR analysis ¹ H / ¹³ C gives the following values is also recovered with a yield greater than 90%:

1H NMR (CDCl3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 3.08 (d, OC (O) -O- CH-CH ₂ -OC (O) -CH ₂ -CH = CH), 4.36 (d, OC (O) -O-CH-CH 2 OC (O) -CH ₂ -CH = CH), 4.53 (dd , OC (O) -O-CH ₂ CH-CH ₂ -OC (O) -CH ₂ -CH = CH), 4.66 (m, OC (O) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH), 5.44 (m, OC (O) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH-).

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 37.4 OC (O) -O -CH-CH ₂ -O-C (O) -CH ₂ -CH = CH, 62.80 and 66.0 OC (O) -O-CH ₂ -CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 74.1 OC (O) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 124.1 OC (O) -O-CH-CH ₂ -O-C (O) -CH ₂ -CH = CH, 130.8 OC (O) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 154.7 O-C (O) -O-CH-CH ₂ -OC (O) -CH ₂ - CH = CH, 171.2 OC (O) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

- of the unit (I) of formula:

 of the formula (II)

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

 The number-average molecular weight Mn and the polydispersity index are respectively 16990 g / mol and 2.7.

Example 3: depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ⁹ (monofunctional CTA), then of a dithiocarbonation, and obtaining a copolymer P such that (G, D) is (G2, D2):

Steps (i) and (ii):

Example 1 is repeated, replacing, as chain transfer agent, CTA ¹ with CTA ⁹ , of formula:

Step (Ni) The isolated product, from steps (i) and (ii), lithium bromide (10.00 mmol) and dry THF (10 mL) were placed in a 20 ml flask in which was also placed a bar magnetic stirrer coated with Teflon ^® . The flask and its contents were then put under argon. Then, the carbon disulphide (20.00 mmol) was introduced into the flask drop by syringe. The flask was then immersed in an oil bath at 40 ° C for 17 h. A product was recovered after precipitation in methanol (20 ml), filtration and drying at 23 ° C under vacuum.

A polymer in the form of a liquid is also recovered, the ¹ H / ¹³ C NMR analysis giving the following values:

1H NMR (CDCl3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 2.25 (m, OC (O) -O- CH ₂ CH ₂ CH (CH ₂ CH ₂ CH ₃ CH ₂ CH ₂ CH ₃ CH (CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH (CH ₂ ) ₂ CH (CH ₂ CH ₂ CH ₂ CH (CH ₂ ) ₂ CH (CH ₂ CH ₂ CH ₂ CH (CH ₂ CH ₂ CH ₂ CH)); OC (S) -S-CH ₂ -CH-CH 2 OC (O) -CH = CH), 5.39 (m, SC (S) -O-CH-CH ₂ -OC (O) -CH = CH), 5.87 (m, SC (S) -O-CH-CH ₂ -OC (O) -CH = CH), 7.07 (m, SC (S) -O-CH-CH ₂ -O-C (O) -CH = CH).

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 34.0 OC (S) -S -CH ₂ -CH-CH ₂ -OC (O) -CH = CH, 66.7 OC (S) -S-CH ₂ -CH-CH ₂ -OC (O) -CH = CH, 83.9 S-C (S) -O-CH-CH ₂ -OC (O) -CH = CH, 122.2 SC (S) -O-CH-CH ₂ -OC (O) -CH = CH, 150.9 SC (S) -O-CH-CH ₂ -OC (O) -CH = CH, 166.5 SC (S) -O-CH-CH ₂ -OC (O) -CH = CH, 205.1 SC (S) -O-CH-CH ₂ -OC (O) -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 dithiocyclocarbonate end groups, the main chain of which consists essentially of:

 - of the unit (I) of formula:

- of the unit (II) of formula:

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

 The number-average molecular weight Mn and the polydispersity index are, respectively, 17,090 g / mol and 2.80.

Example 4: depolymerization / cyclization by heating a poly (butadiene-isoprene), followed by cross-metathesis in the presence of ¹⁰ CTA (CTA difunctional channel), then a dithiocarbonatation, and obtaining a copolymer P as (G, D) is (G2, D2):

Example 3 is repeated without adding benzoquinone in step (i), and replacing in step (ii) as a chain transfer agent, CTA ⁹ by CTA ¹⁰ , of formula:

It is also recovered at the end of step (iii) (ie after reaction of the CS2 on the unsaturated epoxy-terminated liquid polyolefin resulting from stage (ii)), with a yield greater than 90%, a polymer under in the form of a colorless liquid whose ¹ H / ¹³ C NMR analysis gives the following values:

¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH3) cis and trans / motif isoprene), terminal moiety = 3.04 (d, SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH), 3.69 (dd, OC (S) -S-CH 2 CH) -CH ₂ -OC (O) -CH ₂ -CH = CH), 4.37 (dd, O-C (S) -S-CH 2 -CH-CH 2 OC (O) -CH ₂ -CH = CH), 4.51 (m, SC (S) -O-CH-CH ₂ -O-C (O) -CH ₂ -CH = CH), 5.44 (m, SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH).

1 ³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repetition unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal group = 34.0 OC (S) - S-CH ₂ -CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 37.4 SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, OC 34.0 ( S) -S-CH ₂ -CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 66.7 OC (S) -S-CH ₂ -CH-CH ₂ -O-C (O) -CH ₂ -CH = CH, SS.g. S-C18-O-CH-CH2O-CH10-CH2 CH3H, 124.1 SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 130.8 SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 205.1 SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH, 171 .2 SC (S) -O-CH-CH ₂ -OC (O) -CH ₂ -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 terminal dithiocydocarbonate groups, the main chain of which consists essentially of:

 - pattern I) of formula:

 - of the unit (II) of formula:

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

The number-average molecular weight Mn and the polydispersity index are, respectively, 171 10 g / mol and 2.80. EXAMPLE 5 depolymerization / cyclization by heating a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ³ (monofunctional CTA) and obtaining a copolymer P such that (G, D) is ( G3, D3):

Example 1 is repeated, replacing, as a chain transfer agent, CTA ¹ with CTA ³ , of formula:

A polymer in the form of a liquid is also recovered, the ¹ H / ¹³ C NMR analysis giving the following values:

1H NMR (CDCl3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 1.39 (s, OC (O) - OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -O-C (O) -CH = CH), 2.25 (m, OC (O) -OC = CH-CH ₂ -CH ₂ -OC ( O) -CH ₂ -CH = CH-CH ₂ ), 4.43 (dd, OC (O) -OC = CH-CH ₂ -CH 2 OC (O) -CH ₂ -CH = CH), 2.45 (m, OC (O) -O-C = CH-CH 2 CH ₂ -OC (O) -CH ₂ -CH = CH), 5.90 (m, OC (O) -OC = CH-CH ₂ -CH ₂ -O-C (O) -CH ₂ -CH = CH). 7.02 (m, OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH),

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 26.9 OC (O) -OC (CH ₃ ) ₂ - C = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 30.9 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -O- C (O) -CH = CH, 64.2 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 79.4 OC (O) -OC (CH) ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 107.2 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 122.2 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 150.9 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 152.7 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 155.7 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) CH = CH, 166.5 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH = CH. These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

 - pattern I) of formula:

 - of the unit (II) of formula:

 of which 2 units (I) are each connected to one of the two terminal groups of formula:

 The number-average molecular weight Mn and the polydispersity index are 17080 g / mol and 2.80, respectively.

Example 6: depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ⁴ (difunctional CTA pathway) and obtaining a copolymer P such that (G, D) is ( G3, D3):

Example 2 is repeated, replacing CTA ² by CTA ⁴ with the formula

A polymer in the form of a colorless liquid whose NMR analysis ¹ H / ¹³ C gives the following values is also recovered with a yield greater than 90%:

1H NMR (CDCl3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 1.39 (s, OC (O) - OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -O-C (O) -CH 2 CH = CH), 2.59 (m, OC (O) -OC = CH-CH 2 CH ₂ -OC (O) -CH ₂ -CH = CH), 3.08 (d, OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH 2 CH = CH), 4.43 (dd, OC (O ) -O-C = CH-CH ₂ -CH ^ OC (O) -CH ₂ -CH = CH), 5.44 (m, OC (O) -O-C = CH-CH ₂ -CH ₂ -O- C (O ) -CH ₂ -CH = CH-), 6.13 (dd, OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH).

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 26.9 OC (O) -OC (CH ₃ ) ₂ - C = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 30.9 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ - OC (O) -CH ₂ -CH = CH, 37.4 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 64.2 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 107.2 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) - CH 2 -CH = CH, 79.4 OC (O) -O-C (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 124.1 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 130.8 OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 152.7 OC (O ) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 155.7 OC (O) -OC (CH ₃ ) ₂ -C = CH-CH ₂ -CH ₂ -OC (O) -CH = CH, 171. OC (O) -OC = CH-CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

- of the unit (I) of formula:

 of the formula (II)

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

 The number average molecular weight Mn and the polydispersity index are 17100 g / mol and 2.80, respectively.

Example 7: depolymerization / cyclization by heating a poly (butadiene-isoprene), followed by cross-metathesis in the presence of ⁵ CTA (CTA monofunctional channel) and obtaining a copolymer P such that (G, D) is ( G4, D4):

Example 1 is repeated, replacing, as a chain transfer agent, CTA ¹ with CTA ⁵ , of formula:

A polymer in the form of a liquid is also recovered, the ¹ H / ¹³ C NMR analysis giving the following values:

¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 1.49 (s, OC (O) -O-CH (CH) ₃₎ -CH2-CH2-CH ₂ -O- C (O) -CH = CH), 1 .69 (d, OC (O) -OC (CH ₃₎ -CH ^ CH ₂ -CH ₂ -OC (O ) -CH = CH), 2.25 (m, Ο-ΰ (Ο) -Ο-ΰΗ (ΰΗ ₃ ) -ΰΗ2-ΰΗ2-ΰΗ ₂ -Ο-ΰ (Ο) -ΰΗ = ΰΗ-ΰΗ2), 1 .93 (m, OC (O) -OC (CH ₃ ) -CH ₂ -CH 2 CH ₂ -OC (O) -CH = CH), 4.20 (dd, OC (O) -OC (CH ₃ ) -CH ₂ - CH ₂ -CH 2 OC (O) -CH = CH), 5.31 and 5.61 (d, OC (O) -OC (= CH ₂ ) -C (CH ₃ ) -CH ₂ -CH ₂ CH ₂ -OC (O) ) -CH = CH), 5.90 (m, OC (O) -OC (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH), 7.02 (m, OC (O) - OC (CH ₃ ) -CH ₂ -CH ₂ -CH 2 OC (O) -CH = CH). ¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, end group = 150.9 OC (O) -OC (CH ₃₎ -CH ₂ - CH ₂ -CH ₂ -OC (O) -CH = CH, 122.2 OC (O) -OC (CH ₃₎ -CH ₂ -CH ₂ -CH ₂ -OC (O) - CH = CH, 24.9 OC (O) -O-CH (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH, 28.9 OC (O) -O-CH (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH, 35.9 OC (O) -O-CH (CH ₃₎ -CH ₂ -CH ₂ - CH ₂ -OC (O) -CH = CH), 65.3 OC (O) -O-CH (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH, 79.3 OC (O) -OC (= CH ₂ ) -C (CH ₃ ) -CH2-CH2-CH ₂ -OC (O) -CH = CH, 122.2 OC (O) - O-CH (CH ₃₎ -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH), 150.9 OC (O) -O-CH (CH ₃₎ -CH ₂ - CH ₂ -CH ₂ -OC (O) -CH = CH, 152.7 OC (O) -O-CH (CH ₃₎ -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH, 161 .6 OC (O) -OC (= CH ₂ ) -C (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH, 166.5 OC (O) -O-CH (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH = CH).

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

 - of the unit (I) of formula:

 pattern II) of formula

; and of which 2 units (I) are each connected to one of the two terminal groups of formula:

 The number average molecular weight Mn and the polydispersity index are 17070 g / mol and 2.80, respectively.

EXAMPLE 8 depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ⁶ (difunctional CTA pathway) and obtaining of a copolymer P such that (G, D) is ( G4, D4):

Example 2 is repeated replacing CTA ² with CTA ⁶ , of formula:

A polymer in the form of a colorless liquid whose NMR analysis ¹ H / ¹³ C gives the following values is also recovered with a yield greater than 90%:

1H NMR (CDCl3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH 3) cis and trans / isoprene unit), terminal group = 1.49 (s, OC (O) - OC (CH ₃₎ -CH 2 -CH 2 -O- CH ₂ C (O) -CH ₂ -CH = CH), 1 .69 (d, OC (O) -OC (CH ₃₎ -CH ^ CH ₂ - CH ₂ -OC (O) -CH ₂ -CH = CH), 1.93 (m, OC (O) -OC (CH ₃ ) -CH ₂ -CH ₂ CH ₂ -OC (O) -CH ₂ -CH = CH) ), 3.08 OC (O) -OC (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH 2 CH = CH, 4.22 (dd, OC (O) -O-C (CH ₃ ) -CH2-CH2-CH ^ OC (O) -CH ₂ -CH = CH), 5.44 (m, OC (O) -OC (CH ₃₎ -CH ₂ - CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH). ¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 24.9 OC (O) -OC (CH ₃₎ - CH 2 -CH ₂ -CH 2 OC (O) -CH ₂ -CH = CH), 28.9 OC (O) -OC (CH ₃₎ -CH ₂ -CH ₂ -O- CH ^ C (O ) -CH ₂ -CH = CH, 35.9 OC (O) -OC (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 37.4 OC (O) -OC ( CH ₃₎ -CH ₂ -CH ₂ -CH ₂ - OC (O) -CH ₂ -CH = CH, 65.3 OC (O) -O-C (CH ₃₎ -CH ₂ -CH ₂ -CH ₂ -OC ( O) -CH ₂ -CH = CH), 79.3 OC (O) -OC (= CH ₂ ) -CH ₂ -C (CH ₃ ) -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH , 124.1 OC (O) -OC (CH ₃₎ -CH ₂ -CH ₂ - CH ₂ -OC (O) -CH ₂ -CH = CH, 130.8 OC (O) -OC (CH ₃₎ -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 152.7 OC (O) -OC (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 161 OC (O) -OC (= CH ₂ ) -CH ₂ -C (CH ₃ ) -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH, 171. OC (O) - OC (CH ₃ ) -CH ₂ -CH ₂ -CH ₂ -OC (O) -CH ₂ -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

 - of the unit (I) of formula:

 - of the unit (II) of formula:

 of which 2 units (I) are each connected to one of the two terminal groups of formulas:

The number-average molecular weight Mn and the polydispersity index are, respectively, 17120 g / mol and 2.80. Example 9: depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ⁷ (monofunctional CTA) and obtaining a copolymer P such that (G, D) is ( G5, D5):

Example 1 is repeated, replacing, as chain transfer agent, CTA ¹ with CTA ⁷ , of formula:

A polymer in the form of a liquid is also recovered, the ¹ H / ¹³ C NMR analysis giving the following values:

¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH3) cis and trans / isoprene unit), terminal group = 2.25 (m, OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH-CH ₂ ), 2.31 (s, OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH), 4.73 (s, OC (O) -OC (CH ₃ ) = C-CH 2 OC (O) -CH = CH), 5.87 (m, OC (O) -O) - C (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH), 7.08 (m, OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH ).

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 10.5 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 62.8 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 144.3 O- ( O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 150.9 OC (O) -OC (CH ₃ ) = C-CH ₂ -O-C (O) -CH = CH , 122.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 122.2 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 153.0 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH, 155.7 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC ( O) -CH = CH, 166.5 OC (O) -O-C (CH ₃ ) = C-CH ₂ -OC (O) -CH = CH.

These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of: - of the unit (I) of formula:

 - of the formula (II)

 of which 2 units (I) are each connected to one of the two terminal groups of formula:

 The number average molecular weight Mn and the polydispersity index are, respectively, 17050 g / mol and 2.80.

EXAMPLE 10 depolymerization / cyclization by heating of a poly (butadiene-isoprene), followed by cross-metathesis in the presence of CTA ⁸ (difunctional CTA pathway) and obtaining of a copolymer P such that (G, D) is ( G5, D5):

Example 2 is repeated, replacing CTA ² with CTA ⁸ , of formula

A polymer in the form of a colorless liquid whose NMR analysis ¹ H / ¹³ C gives the following values is also recovered with a yield greater than 90%: ¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH3) cis and trans / isoprene unit), terminal group = 2.18 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 3.08 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH 2 CH = CH, 4.83 OC ( O) -O-C (CH ₃ ) = C-CH 2 OC (O) -CH ₂ -CH = CH, 5.44 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH.

¹³ C NMR (CDCIs, 100 MHz, 298 K): δ (ppm) repeat unit 20.0, 27.4, 32.7, 37.4, 41.8, 124.2, 126.2, 131.4, terminal grouping = 10.5 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 37.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH , 62.8 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 1 16.2 OC (O) -O-C (CH ₃ ) = C-CH ₂ - OC (O) -CH ₂ -CH = CH, 122.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 124.1 OC (O) -OC (CH) ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 130.8 O-C (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH , 144.3 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 147.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O ) -CH ₂ -CH = CH, 155.7 OC (O) -OC (= C) -CH ₂ -OC (O) -CH ₂ -CH = CH, 171 .2 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH.

 These values confirm that the product obtained is a copolymer comprising 2 end groups cyclocarbonate, whose main chain consists essentially of:

 - pattern I) of formula:

 - of the unit (II) of formula:

of which 2 units (I) are each connected to one of the two terminal groups of formulas:

 The number-average molecular weight Mn and the polydispersity index are 17080 g / mol and 2.80, respectively.

Example 11: depolymerization / cyclization by heating of poly (butadiene-isoprene) in the presence of norbornene, followed by cross-metathesis in the presence of CTA ⁸ :

Example 10 is repeated, replacing in step (i) the 81.00 mmol of poly (butadiene-isoprene) with a mixture of 41.00 mmol of polybutadiene-isoprene and 40.00 mmol of norbornene of formula :

 and available from Sigma Aldrich.

 The ratio r of the reagents, as defined above, is equal to 0.27 mmol divided by 41.00 mmol + 40.00 mmol, ie 0.003.

After 8 hours from the addition of CTA ⁸ , the product in the flask is removed after evaporation of the solvent in vacuo. The product is then recovered in the form of a liquid at room temperature, after precipitation in methanol, filtration and drying at 23 ° C. under vacuum, with a yield greater than 90%.

A polymer in the form of a liquid is also recovered, the ¹ H / ¹³ C NMR analysis giving the following values:

¹ H NMR (CDCl 3, 500 MHz, 298 K): δ (ppm) repetition unit 1 .09 (s, CH ₃ isoprene unit), 2.06 and 2.1 1 (m, CHΣ I isoprene and butadiene units), 5.41 and 5.45 (m, CH = CH cis and trans / butadiene unit), 4.95 and 4.99 (m, CH = C (CH3) cis and trans / isoprene unit), terminal group = 2.18 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 3.08 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH 2 CH = CH, 4.83 OC ( O) -O- C (CH ₃ ) = C-CH 2 OC (O) -CH ₂ -CH = CH, 5.50 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH- , 5.58 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH.

¹³ C NMR (CDCl 3, 100 MHz, 298 K): δ (ppm) repeat unit: 27.4, 33.1, 42.1, 43.4, 130.3, 133.1, terminal group = 9.5 OC (O) ) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 38.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ - CH = CH, 53.6 O-C (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 16.2 OC (O) -OC (CH ₃ ) = C- CH ₂ - OC (O) -CH ₂ -CH = CH, 120.0 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 122.4 OC (O) - OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 133.4 OC (O) -O-C (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ - CH = CH, 147.4 OC (O) -OC (CH ₃ ) = C-CH ₂ -OC (O) -CH ₂ -CH = CH, 165.9 OC (O) -OC (CH ₃ ) = C-CH ₂ - OC (O) -CH ₂ -CH = CH.

 These values confirm that the polymer obtained is a copolymer comprising 2 similar end groups of a cyclocarbonate, the main chain of which consists essentially of:

- of the unit (I) of formula: pattern II) of formula

 pattern (III) of formula

of which 2 units (I) are each connected to one of the two terminal groups of formula:

 The number average molecular weight Mn and the polydispersity index are respectively 22 450 g / mol and 2.80.

Example 12 Synthesis of a Polyurethane from the Unsaturated Liquid Polyolefin End-Group Cyclocarbonate of Example 2

The polyolefin of Example 2 was reacted at 80 ° C. in a stoichiometric ratio with a primary diamine of the polyether diamine type (JEFFAMINE EDR 176, Huntsman) until complete disappearance of the characteristic infrared band. groups (1, 3-dioxolan-2-one-4yl) methyl (at 1806 cm ^-1 ) and appearance of bands characteristic of the carbamate bond (band at 1700 cm ^-1 ).

 The reaction time recorded during the complete disappearance of the infrared band characteristic of (1,3-dioxolan-2-one-4yl) methyl groups was approximately 3 hours.

EXAMPLE 13 Synthesis of a Poly (thio) urethane from the Dithiocyclocarbonate End Group Liquid Unsaturated Polyolefin of Example 4

It was reacted at 23 ° C., in a stoichiometric ratio, the dithiocyclocarbonate end-group liquid unsaturated polyolefin of Example 4 with a primary diamine of the polyether diamine type (JEFFAMINE EDR 176, Huntsman) until it disappeared. complete infrared band characteristic of 2-thione-1,3-oxathiolan-4-yl groups (CS band at 1200 cm-1 in Infra-Red), and appearance of the characteristic bands of the thiocarbamate linkage (band C = S at 1530 cm ^-1 in Infra-Red) and thiol and disulfide functions (HS band at 2500 cm ^-1 and SS band at 510 cm ^-1 in Raman).

 The reaction time was about 3 hours.

Example 14 Synthesis of a Polyurethane from the Liquid Unsaturated Polyolefin with 2-Oxo-1,3-dioxolen-4-yl End Group of Example 10

The 2-oxo-1,3-dioxolen-4-yl end-group liquid unsaturated polyolefin was reacted at 23 ° C. at a stoichiometric ratio of Example 10 until complete disappearance of the infrared band characteristic of 1, 3-dioxolen-2-one groups (at 1800 cm ^-1 ) and appearance of bands characteristic of 2-oxazolidinone groups (band between 1770 and 1780 cm ^-1 ) resulting from rapid post-cyclization of keto-carbamates previously obtained.

 The reaction time was about 3 hours.

Example 15 Synthesis of a Polyurethane from the Liquid Unsaturated Polyolefin with 2-Oxo-1,3-dioxolen-4-yl End Group of Example 11:

 Example 14 is repeated replacing the polyolefin of Example 10 with the 2-oxo-1,3-dioxol-4-yl end-group polyolefin of Example 11.

 We obtain the same result.

Claims

1. Hydrocarbon copolymer P comprising 2 terminal groups F ¹ and

F ² of cyclocarbonate type and the like, having respective formulas:

GO- (O = C) - (CH ₂ ) _g - and - (CH ₂ ) _d -C (= O) -OD

 (G) (D)

in which :

 - g and d, identical or different, represent an integer equal to 0, 1, 2 or 3; and

 G and D are 2 monovalent radicals such that the pair (G, D) is chosen from the pairs:

- G1, D1) of formulas

 (G1) (D1)

in which A ¹ is an alkylene group comprising from 1 to 9 carbon atoms

- G2, D2) of formulas

 (G2) (D2)

wherein A ² is an alkylene group having 1 to 9 carbon atoms;

- (G3, D3) of formulas in which :

- A ³ is an alkylene group comprising from 1 to 9 carbon atoms,

- A ⁴ , A ⁵ and A ⁶ , 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 whose alkyl chain comprises from 1 to 4 carbon atoms;

 - G4, D4) of respective formulas:

 (G4) (D4)

in which :

- A ⁸ represents a hydrogen atom or an alkyl radical, linear or branched, comprising 1 to 9 carbon atoms,

- A ⁷ is an alkylene group comprising from 1 to 9 carbon atoms or a divalent radical comprising from 1 to 20 carbon atoms and which may be linear or branched, cyclic or heterocyclic with one or more heteroatoms chosen from oxygen and sulfur;

 - G5, D5) of respective formulas:

 (G5) (D5)

in which : - A ⁹ and A ¹⁰ , identical or different, each represent a hydrogen atom, an alkyl radical, linear or branched, comprising from 1 to 6 carbon atoms, a cycloalkyl radical comprising 5 or 6 carbon atoms, a phenyl radical; or an alkylphenyl group whose alkyl chain comprises from 1 to 4 carbon atoms;

A ⁹ and A ¹⁰ may further be bonded together to form a - (CH 2 -) _q - group in which q is an integer 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 different from 0:

 a unit (II) of formula (II repeated n times, n being an integer different from 0

 in which R ° represents the methyl radical or one of the 3 radicals of following formula:

and, optionally, a unit (III) of formula (III) repeated m times, m being an integer greater than or equal to 0:

in which :

- R ¹ , R ² , R ³ and R ⁴ , identical or different, represent:

 a hydrogen or halogen atom; or

 a radical comprising from 1 to 22 carbon atoms and chosen from alkyl, alkenyl, alkoxycarbonyl, alkenyloxycarbonyl, alkylcarbonyloxy, alkenylcarbonyloxy, alkylcarbonyloxyalkyl, the hydrocarbon chain of said radical possibly being interrupted by at least one oxygen atom or one sulfur atom; ; in addition:

at least one of the groups R ¹ to R ⁴ can form, together with at least one other group R ¹ to R ⁴ and with the carbon atom or atoms to which the said groups are connected, a saturated or unsaturated hydrocarbon ring or heterocycle, optionally substituted, and comprising from 3 to 10 members; and

at least one of the pairs (R ¹ , R ² ) and (R ³ , R ⁴ ) can form, with the carbon atom to which said pair is linked, a group of 2 carbon atoms connected by a double bond: C = C , the other carbon atom has two substituents selected from a hydrogen atom or a Ci-C ₄ alkyl; and

the carbon atom carrying one of the groups of the pair (R ¹ , R ² ) can be connected to the carbon atom carrying one of the groups of the pair (R ³ , R ⁴ ) by a double bond, it being understood that, according to the valence rules, only one of the groups of each of these 2 pairs is then present;

R ⁵ represents:

 an oxygen or sulfur atom, or

a divalent radical -Ch -, -C (= O) - or -NR ⁶ - in which R ⁶ is an alkyl or alkenyl radical comprising from 1 to 22 carbon atoms;

furthermore, that:

the link == represents a single bond or a double bond; - F ¹ and F ² are each connected to one of the two ends of the main chain and a pattern (I); and

 n, p and m are such that the number-average molecular weight Mn of the copolymer P is in a range of from 400 to 100,000 g / mol and its polymolecularity index is in a range from 1.5 to 3; , 0.

2. Copolymer P according to claim 1, characterized in that its main chain consists essentially of the repeating unit (I) of formula (I), the repeating unit (II) of formula (II) and, optionally, the unit of repetition (III) of formula (III), and in that the number p of units (I) and the number n of units (II) are such that:

 p / (n + p) is between 45 and 95%, and

 n / (n + p) is between 5 and 55%.

3. Copolymer P according to one of claims 1 or 2, characterized in that its main chain is such that:

 the reason (I) also has the formula (Γ):

 the reason (II) also has formula (ΙΓ):

in which R ° represents the methyl radical or one of the 3 radicals of following formula:

and, optionally, the unit (III) also has the formula (ΙΙΓ):

 it being specified that in said formulas the bond is a single bond geometrically oriented on one side or the other with respect to the double bond (cis or trans).

4. Copolymer P according to claim 3, characterized in that its main chain is such that:

 on the p units of formula (Γ), p "also correspond to formula (I"), p "being an integer different from 0, less than and such that p" / p is greater than 0.8:

 - on the n units of formula (ΙΓ), n "also correspond to formula (II"), 'being an integer different from 0, less than n and such that nV is greater than 0.9:

I ").

5. Copolymer P according to one of claims 1 to 4, characterized in that the radical R ° of the unit (II) represents the methyl radical.

6. Copolymer P according to one of claims 1 to 5, characterized in that F ¹ and F ² respectively have formulas:

in which :

- A ¹ is a methylene group; and

 - g and d are identical and equal to 0 or 1.

7. Copolymer P according to one of claims 1 to 5, characterized in that F ¹ and F ² have the following formulas:

 in which :

- A ² is a methylene group; and

 - g and d are identical and equal to 0 or 1.

8. Copolymer P according to one of claims 1 to 5, characterized in that F ¹ and F ² respectively have formulas:

 in which :

- A ³ is a - (CH2) 2- group; - A ⁴ is a hydrogen atom;

- A ⁵ and A ⁶ are each methyl; and

 - g and d are identical and equal to 0 or 1.

9. Copolymer P according to one of claims 1 to 5, characterized in that F ¹ and F ² have the following formulas:

 in which :

- A ⁷ is a propylene group;

- A ⁸ is a methyl; and

 - g and d are identical and equal to 0 or 1.

10. Copolymer P according to one of Claims 1 to 5, characterized in that F ¹ and F ² respectively have the following formulas:

 in which :

- A ⁹ is a hydrogen atom;

- A ¹⁰ is a methyl; and

 - g and d are identical and equal to 0 or 1.

11. Process for preparing the hydrocarbon-based copolymer P as defined in one of claims 1 to 10, said process comprising:

(i) a step of heating at a temperature ranging from 30 ° C to 80 ° C: (a) a random bipolymer A selected from poly (butadiene-isoprene), poly (butadiene-myrcene) and poly ( butadiene-farnesene); and (b) optionally, in the presence of a compound B of formula (B):

 then

 (ii) a step of heating the product formed in step (i) to a temperature in a range of 20 to 60 ° C, in the presence of a chain transfer agent (also known as CTA), being specified that :

(c) when said hydrocarbon copolymer P is such that the pair (G, D) is (G1, D1), (G3, D3), (G4, D4), or (G5, D5), then said CTA is a compound of formula (C1) or (C2):

 (C1) (C2)

in which :

F ¹ and F ² are such that the pair (G, D) corresponds to the corresponding definition (G1, D1), (G3, D3), (G4, D4), or (G5, D5);

- The bond * ~> "~ · is a single bond carbon-carbon oriented geometrically on one side or the other with respect to the double bond (cis or trans); and

(d) when said hydrocarbon copolymer P is such that the pair (G, D) is (G2, D2), then said di-epoxidized compound of formula (C'1) or (C'2):

 (C'1) (C'2)

in which :

- F ' ¹ e and F' ² e are the monovalent radicals of formulas (G ') and (D'):

(G ') (D') - The bond * ~>"~ · is a single bond carbon-carbon oriented geometrically on one side or the other with respect to the double bond (cis or trans); it being further specified that each of steps (i) and (ii) is carried out in the presence of a metathesis catalyst and a solvent;

 then

 (iii) when said hydrocarbon-based copolymer P is such that the pair (G, D) is (G2, D2), a dithiocarbonation stage of the polymer obtained in stage (ii), by reaction with carbon disulphide (CS2) in the presence of a halogenated lithium compound, at a temperature ranging from 10 to 45 ° C.

12. The method of claim 1 1, characterized in that the bipolymer A implemented in step (i) is a poly (butadiene-isoprene), preferably comprising from 45 to 95% of number of units derived from butadiene. and from 5 to 55% of number of units derived from isoprene, said percentages being expressed based on the total number of units constituting the chain of poly (butadiene-isoprene).

13. The method of claim 12, characterized in that the poly (butadiene-isoprene) chain implemented in step (i) comprises:

 less than 5% number of butadiene vinyl-1,2 units, on the basis of the number of units derived from butadiene, and

 less than 5% of the total number of isoprene vinyl-1, 2 units and isoprene vinyl-3,4 units, based on the number of units derived from isoprene.

14. Method according to one of claims 12 or 13, characterized in that the poly (butadiene-isoprene) chain implemented in step (i) comprises:

 at least 80% of cis-1,4-butadiene units, based on the number of units derived from butadiene, and

at least 90% of cis-1,4 isoprene units, based on the number of units derived from isoprene.

15. Use as adhesive of the hydrocarbon polymer as defined in one of claims 1 to 10, in admixture with an amine compound comprising at least two amino groups

16. A method of assembling two substrates by gluing, comprising:

coating on at least one of the two substrates to be assembled with a liquid adhesive composition obtained by mixing an amine compound comprising at least two amino groups with the hydrocarbon polymer as defined in one of Claims 1 to 10; then

 the effective contact of the two substrates.