(Meth)acrylic composition comprising a modified polyurethane

1. A process for the preparation of a polyurethane comprising:

E1) a stage of preparation of a polyurethane having NCO endings comprising the polyaddition reaction between:

i) at least one polyisocyanate;

ii) at least one polyol; and

iii) at least one amine having the following formula (I) or (II):

wherein:

m and n are, independently of each other, an integer ranging from 1 to 150;

r is an integer ranging from 1 to 200;

R′ represents a radical selected from the group consisting of a saturated or unsaturated and linear or branched alkyl comprising from 1 to 20 carbon atoms;

v represents an integer ranging from 0 to 5;

R 2 and R 3 represent, independently of each other, a halogen atom, a hydrogen atom or a linear or branched alkyl group comprising from 1 to 12 carbon atoms, said alkyl group being optionally interrupted by at least one oxygen atom;

R 4 represents a hydrogen atom, an arylalkyl group or a linear or branched alkyl group comprising from 1 to 20 carbon atoms;

provided that m+n>2;

and

E2) the reaction of the product formed on conclusion of stage E1) with at least one (meth)acrylate or allyl monomer M comprising at least one hydroxyl functional group.

2. The process as claimed in claim 1 , wherein the amines of formula (I) are chosen from those wherein:

R 1 represents a saturated or unsaturated and linear or branched alkyl comprising from 1 to 20 carbon atoms;

m and n represent, independently of each other, an integer ranging from 1 to 18;

R 2 and R 3 represent, independently of each other, a hydrogen atom or a linear or branched alkyl group comprising from 1 to 12 carbon atoms, said alkyl group being optionally interrupted by at least one oxygen atom;

with m+n>2.

3. The process as claimed in claim 1 , wherein the amines of formula (I) are those wherein:

R 1 represents a linear or branched alkyl comprising from 1 to 5 carbon atoms;

m and n represent, independently of each other, an integer ranging from 1 to 18;

R 2 and R 3 represent a hydrogen atom;

with that m+n>2.

4. The process as claimed in claim 1 , wherein stage E1) is carried out in the presence of amine(s) of formula (I).

5. The process as claimed in claim 1 , wherein the monomer M is chosen from:

M1 monomers having the following formula (III):

CH 2 ═CH—R 1 —OH   (III)

wherein R′ represents a linear or branched alkylene radical comprising from 1 to 9 carbon atoms; or

M2 monomers having the following formula (IV):

CH 2 ═C(R 6 )—C(═O)—O—R 7 —OH   (IV)

wherein:

R 6 represents a hydrogen or a methyl;

R 7 represents a saturated or unsaturated, aliphatic or cyclic, linear or branched, divalent hydrocarbon radical, and being optionally interrupted by one or more heteroatoms, and/or optionally interrupted by one or more aromatic groups, and/or optionally interrupted by one or more divalent —N(R a )— groups with R a representing a linear or branched alkyl radical comprising from 1 to 22 carbon atoms (tertiary amine), —C(═O)O— (ester), —C(═O)NH— (amide), —NHC(═O)O— (carbamate), —NHC(═O)—NH— (urea) or —C(═O)— (carbonyl) groups, and/or being optionally substituted.

6. The process as claimed in claim 5 , wherein the M2 monomer has one of the following formulae:

Formula (IV-1):

CH 2 ═C(R 6 )—C(═O)—O—R 7 —OH   (IV-1)

wherein:

R 6 represents a hydrogen or a methyl;

R 7 represents a saturated or unsaturated, linear or branched, aliphatic or cyclic, divalent alkylene radical comprising from 2 to 22 carbon atoms;

Formula (IV-2):

CH 2 ═C(R 6 )—C(═O)—O—R 8 —O—[C(═O)—(CH 2 ) w —O] s —H   (IV-2)

wherein:

R 6 represents a hydrogen or a methyl;

w is an integer ranging from 1 to 10;

s is an integer ranging from 1 to 10;

R 8 represents a saturated or unsaturated, linear or branched, aliphatic or cyclic, divalent alkylene radical comprising from 2 to 22 carbon atoms;

Formula (IV-3):

CH 2 ═C(R 6 )—C(═O)—O—[R 9 —O] t —H   (IV-3)

wherein:

R 6 represents a hydrogen or a methyl;

R 9 represents a saturated or unsaturated, linear or branched, aliphatic or cyclic, divalent alkylene radical comprising from 2 to 4 carbon atoms and t is an integer ranging from 2 to 120.

7. The process as claimed in claim 1 , wherein the monomer M has one of the following formulae (IV-1-1), (IV-1-2) or (IV-1-3):

(IV-1-1): 2-hydroxyethyl acrylate (HEA):

CH 2 ═CH—C(═O)—O—CH 2 —CH 2 —OH

(IV-1-2): 2-hydroxypropyl acrylate (HPA):

CH 2 ═CH—C(═O)—O—CH 2 —CH(Me)-OH

(IV-1-3): 2-hydroxyethyl methacrylate (HEMA):

CH 2 ═CH(Me)-C(═O)—O—CH 2 —CH 2 —OH.

8. The process as claimed in claim 1 , wherein stage E1) is carried out in amounts of reactants such that the NCO/OH molar ratio (r1) ranges from 1.5 to 5.

9. The process as claimed in claim 1 , wherein the at least one polyol is selected from the group consisting of polyester polyols, polyether polyols, polyene polyols, polycarbonate polyols, poly (ether-carbonate) polyols and their mixtures.

10. The process as claimed in claim 1 , wherein the at least one polyol comprises at least one polyether polyol.

11. The process as claimed in claim 1 , wherein stage E2) is carried out in amounts of reactants such that the OH/NCO molar ratio (r2) is less than or equal to 1.

12. A polyurethane P obtained according to the process of claim 1 .

13. The polyurethane P as claimed in claim 12 , comprising from 0.5% to 10%, by weight of units derived from the amine of formula (I) or (II).

14. The polyurethane P as claimed in claim 12 , wherein the polyurethane P has a viscosity at 70° C. ranging from 5000 mPa·s to 50 000 mPa·s.

15. A composition comprising:

a composition A comprising:

at least one polymer P as defined in claim 12 ; and

at least one vinyl monomer; and

a composition B comprising:

at least one peroxide; and

optionally at least one vinyl monomer.

16. The composition as claimed in claim 15 , wherein the vinyl monomers are chosen from (meth)acrylate monomers selected from the group consisting of:

compounds having the following formula (V):

CH 2 ═C(R 10 )—COOR 11    (V)

wherein:

R 10 represents a hydrogen, a halogen, a CN group, an alkyl group having 1 carbon atom, an alkyl group having 2 carbon atoms, an alkyl group having 3 carbon atoms, or an alkyl group having 4 carbon atoms;

R 11 is selected from the group consisting of alkyls, cycloalkyls, alkenyls, cycloalkenyls, alkylaryls, arylalkyls and aryls, wherein said alkyls, cycloalkyls, alkenyls, cycloalkenyls, alkylaryls, arylalkyls or aryls are optionally substituted and/or interrupted by at least one silane, one silicone, one oxygen, one halogen, one carbonyl, one hydroxyl, one ester, one urea, one urethane, one carbonate, one amine, one amide, one sulfur, one sulfonate or one sulfone;

polyethylene glycol di(meth)acrylates;

tetrahydrofuran (meth)acrylates;

hydroxypropyl (meth)acrylate;

hexanediol di(meth)acrylate;

trimethylolpropane tri (meth)acrylate;

diethylene glycol dimethacrylate;

triethylene glycol dimethacrylate;

tetraethylene glycol dimethacrylate;

dipropylene glycol dimethacrylate;

di(pentamethylene glycol) dimethacrylate;

tetraethylene glycol diacrylate;

diglycerol tetramethacrylate;

tetramethylene dimethacrylate;

ethylene dimethacrylate;

neopentyl glycol diacrylate;

trimethylolpropane triacrylate;

bisphenol A mono- and di(meth)acrylates;

bisphenol F mono- and di(meth)acrylates; and

their mixtures.

17. The composition as claimed in claim 16 , wherein the (meth)acrylate monomer is selected from the group consisting of methyl 2-cyanoacrylate, ethyl 2-cyanoacrylate, butyl 2-cyanoacrylate, octyl 2-cyanoacrylate, 2-methoxyethyl 2-cyanoacrylate, 2-ethoxyethyl 2-cyanoacrylate, methyl (meth)acrylate, ethyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, heptyl (meth)acrylate, 2-(tert-butyl)heptyl (meth)acrylate, octyl (meth)acrylate, 3-isopropylheptyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, 5-methylundecyl (meth)acrylate, dodecyl (meth)acrylate, 2-methyldodecyl (meth)acrylate, tridecyl (meth)acrylate, 5-methyltridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, 2-methylhexadecyl (meth)acrylate, heptadecyl (meth)acrylate, 5-isopropylheptadecyl (meth)acrylate, 4-(tert-butyl)octadecyl (meth)acrylate, 5-ethyloctadecyl (meth)acrylate, 3-isopropyloctadecyl (meth)acrylate, octadecyl (meth)acrylate, nonadecyl (meth)acrylate, eicosyl (meth)acrylate, 3-vinylcyclohexyl (meth)acrylate, bornyl (meth)acrylate, 2,4,5-tri (t-butyl)-3-vinylcyclohexyl (meth)acrylate, 2,3,4,5-tetra (t-butyl)cyclohexyl (meth)acrylate, benzyl (meth)acrylate, phenyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate and their mixtures.

18. The composition as claimed in claim 15 , wherein the peroxide functional group/amine functional group of formula (I) contained in the polyurethane P molar ratio ranges from 0.3 to 1.5.

19. A ready-for-use kit comprising the composition A as defined in claim 15 , on the one hand, and the composition B as defined in claim 15 , on the other hand, packaged in two separate compartments.

20. An adhesive comprising the composition of claim 15 .