摘要:
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.
摘要:
The present invention relates to a process for the preparation of the alkoxyamine 2-methyl-2-[N-(diethoxy-phosphoryl-2,2-dimethylpropyl)aminoxy]propionic acid or of its salts comprising a stage of saponification of an azo compound in the presence of a base, a stage of photolysis of the salt resulting from the saponification stage in the presence of N-(tert-butyl)-1-diethylphosphono-2,2-dimethylpropyl nitroxide and optionally a stage of acidification of the salt of the alkoxyamine obtained on conclusion of the photolysis stage.The alkoxyamine or its salts can be used as radical polymerization initiators.
摘要:
The invention relates to the use of alkoxyamines of formula (I): for the preparation of polymerized or non-polymerized mono- or polyalkoxyamines of formula (II):
摘要:
The present invention relates to a novel process for preparing alkoxyamines from a nitroxide and a dithiocarbamate by photolysis reaction.This process, which does not generate effluent containing metals, may be carried out in batch or in continuous mode and takes place at a lower temperature than the known processes for synthesizing alkoxyamines.
摘要:
The invention relates to the use of alkoxyamines of formula (I): for the preparation of polymerized or non-polymerized mono- or polyalkoxyamines of formula (II):
摘要:
The present invention relates to a process for the preparation of β-phosphorated nitroxide radicals which consist in preparing, in a first step, an aminophosphonate by reaction of a carbonyl compound, of a primary amine and of a phosphorous compound in the presence of a Lewis acid and then, in a second step, in oxidizing the said crude aminophosphonate using nonhalogenated organic peracids in a water/organic solvent two-phase medium with an aqueous phase buffered at a pH ranging from 5 to 12.
摘要:
The present invention is directed to a process for the preparation of polyalkoxyaminies from monioalkoxyamine(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.
摘要:
The invention concerns a heat stabilizer of organic peroxides characterized in that it is an N-hetrocyclic compound which contains at least one nitroxyl radical with the N atom of the nitroxyl radical forming part of the ring. The invention also concerns a storage-stable and heat-stable organic peroxide composition containing an N-hetrocyclic compound which contains at least one nitroxyl radical with the N atom of the nitroxyl radical forming part of the ring, the method for preparing the same and uses thereof for modifying polymers.
摘要:
A process for preparing alkoxyamines in a biphasic medium comprises mixing an ionic liquid, an organic solvent, a metal salt, a ligand for the metal, a halocarbon compound ZX and a nitroxide, keeping the reaction medium stirring at a temperature of between 20° C. and 90° C. until the nitroxide has disappeared, separating the mixture by decantation, recovering the organic phase, and optionally washing it with water and then isolating the alkoxyamine by evaporating the organic solvent under reduced pressure.
摘要:
A subject-matter of the invention is alkoxyamines resulting from β-phosphorated nitroxides corresponding to the formula: in which R represents an alkyl radical having a number of carbon atoms ranging from 1 to 3, R1 represents a hydrogen atom or a residue: in which R3 represents an alkyl radical having a number of carbon atoms ranging from 1 to 20, and R2 represents a hydrogen atom, an alkyl radical having a number of carbon atoms ranging from 1 to 8, a phenyl radical, an alkali metal, such as Li, Na or K, H4N+, Bu4N+ or Bu3HN+, exhibiting a kinetic dissociation constant kd, measured at 120° C. by EPR, of greater than 0.05 s−1. These compounds can be used as initiators for the (co)polymerizations of at least one monomer which can be polymerized by the radical route.