Process for the preparation of polyalkoxyamines which can be used as initiators for the radical polymerization of polyfunctional living (CO)polymers
View Patent ↗The present invention is directed to a process for the preparation of polyalkoxyaminies from monoalkoxyamine(s) of formula (I) and of at least one polyunsaturated compound of formula (II): and the preparation of polyfunctional living (co)polymers by polymerization by the radical route of one or more vinyl monomers in the presence of the polyalkoxyamines thus prepared.
1. Process for the preparation of polyalkoxyamines having functional groups:
in which m is an integer greater than or equal to 2 and less than or equal to n, which comprises reacting at least one monoalkoxyamine(s) of formula (I)
in which R 1 represents a linear or branched alkyl radical having a number of carbon atoms ranging from 1 to 3 and R 2 represents a hydrogen atom, a liner or branched alkyl radical having a number of carbon atoms ranging from 1 to 8, a phenyl radical, an alkali metal, selected from the group consisting of Li, Na or K, or an ammonium ion, selected from the group consisting of NH 4 + , NBu 4 + or NHBu 3 + ; with at least one polyunsaturated compound of formula (II):
in which Z is an aryl group or Z 1 -[X—C(O)] n where Z 1 represents a polyfunctional structure, X is an oxygen atom, a nitrogen atom carrying a carbonaceous group, a hydrogen atom, or a sulphur atom, and n is an integer greater than or equal to 2, at a reaction temperature f between about 0 and 90° C., the molar ratio of monoalkoxyamine(s) of formula (I) to polyunsaturated compound(s) of formula (II) being between 1.5 and 1.5 n.
2. Process according to claim 1 , characterized in that said reacting occurs in the presence of a solvent selected from the group consisting of alcohol, aromatic solvents, chlorinated solvents, ethers, polar aprotic solvents, or mixtures thereof.
3. Process according to claim 1 , characterized in that the reaction temperature is between about 25 and 80° C.
4. Process according to claims 1 , characterized in that compound is chosen from divinylbenzene, trivinylbenzene, ethylene glycol diacrylate, 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, cyclohexanedimethanol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polyethylene glycol diacrylates, hexanediol alkoxylate diacrylates, bisphenol A diacrylate, bisphenol A ethoxylate diacrylates, trimethylolpropane triacrylate, pentaerythritol triacrylate, tris(2-hydroxyethyl) isocyanurate triacrylate, trimethylolpropane ethoxylate triacrylates, glyceryl propoxylate triacrylate, trimethylolpropane propoxylate triacrylates, pentaerythritol tetraacrylate, ditrimethylolpropane tetraacrylate, pentaerythritol ethoxylate tetraacrylate, dipentaerythritol pentaacrylate, caprolactones modified dipentaerythritol hexaacrylates or dipentaerythritol pentaacrylate.
5. Process for the preparation of polyfunctional living (co)polymers by polymerization by the radical route of one or more vinyl monomers in the presence of polyalkoxyamines prepared beforehand according to the process of claim 1 .
6. Process for the preparation of polyfunctional living (co)polymers according to claim 5 , characterized in that the polyalkoxyamines are prepared prior to the (co)polymerization.
7. Process for the preparation of polyfunctional living (co)polymers according to claim 5 , characterized in that the polyalkoxyamines are prepared simultaneously with the (co)polymerization.
8. Process according to claim 5 , characterized in that it is carried out in bulk, in solution, in emulsion, in miniemulsion or in suspension at a polymerization temperature greater than about 90° C.
9. Process according to claim 5 , characterized in that the vinyl monomers are chosen from styrene, substituted styrenes, dienes, acrylic monomers, methacrylic monomers.
10. Process according to claim 5 further comprising at least one polymerization initiator selected from the group consisting of organic peroxides, inorganic peroxides, azo compounds or other alkoxyamines.
11. Process of claim 1 characterized in that said reacting occurs under a nitrogen atmosphere.
12. Process of claim 1 , characterized in that R 1 is CH 3 and R 2 is H.
13. Process of claim 1 , characterized in that the molar ratio of monoalkoxyamine(s) of formula (I) to polyunsaturated compound(s) of formula (II)is between n and 1.25 n.
14. Process of claim 2 , further comprising evaporation of said solvents after said reacting.
15. Process of claim 9 characterized in that said diene is selected from the group consisting of butadiene or isoprene.
16. Process of claim 9 characterized in that said acrylic monomers are selected from the group consisting of acrylic acid, alkyl acrylates, aryl acrylates, or functional acrylates.
17. Process of claim 16 characterized in that said acrylic monomers are halogenated.
18. Process of claim 16 characterized in that said acrylic monomers are a carrier of siloxane functional groups.
19. Process of claim 9 characterized in that said methacrylic monomers are selected from the group consisting of methyl methacrylate, alkyl methacrylate, functional methacrylate or mixtures thereof.
20. Process of claim 19 characterized in that said methacrylic monomers are halogenated.
21. Process of claim 19 characterized in that said methacrylic monomers are a carrier of siloxane functional groups.
22. Process of claim 19 characterized in that said methacrylic monomers are selected form the group N,N-dimethylacrylamide, 4-acryloylmorpholine, methacrylamide; substituted methacrylamides, vinylpyridine, vinylpyrrolidinone, vinyl chloride, vinylidene difluoride or mixtures thereof.
23. Process of claim 8 characterized in that said solution is aqueous.
24. Process of claim 8 characterized in that said solution is organic.