Abstract: The invention relates to a method for obtaining polyamide or copolyamide particles which are spheroidal and whose average diameter is between 40 and 150 ?m, preferably between 60 and 100 ?m. Said method consists of introducing a mineral charge, preferably silica, having an average diameter of 1-30 ?m into the reaction mixture. The invention also relates to a polyamide or copolyester amide powder and to the use thereof in order to manufacture coatings, ink compositions, paint compositions, cosmetic compositions, pharmaceutical compositions, alloys with metal powders or metal oxide powders and parts by agglomerating said powder by laser sintering, IR radiation or UV radiation.

Abstract: The invention relates to a method for obtaining polyamide or copolyesteramide particles which are spheroidal and whose average diameter is between 40 and 150 ?m, preferably between 60 and 100 ?m. Said method consists in introducing a mineral charge, preferably silica, having an average diameter of 1-30 ?m into the reaction mixture. The invention also relates to a polyamide or copolyesteramide powder and to the use thereof in order to manufacture coatings, ink compositions, paint compositions, cosmetic compositions, pharmaceutical compositions, alloys with metal powders or metal oxide powders and parts by agglomerating said powder by laser sintering, IR radiation or UV radiation.

Abstract: The invention relates to a process for trapping a free monomer which has not reacted by copolymerization or by grafting comprising at least one epoxide functional group in a thermoplastic composition based on ethylene and/or on propylene and based on at least one monomer comprising at least one epoxide functional group, the said process comprising the following stages: preparation of the said thermoplastic composition, addition of a sufficient amount of a solid trapping additive exhibiting, at its surface, sites with a basic nature within the Lewis or Brönsted meaning. The trapping additive is a porous zeolite, the diameter of the pores of which is between 5 and 15 angströms, preferably between 6 and 13 angströms. The invention also relates to the composition obtained by such a process and to the blends comprising such a composition.

Abstract: The invention relates to a process for trapping a free monomer which has not reacted by copolymerization or by grafting comprising at least one epoxide functional group in a thermoplastic composition based on ethylene and/or on propylene and based on at least one monomer comprising at least one epoxide functional group, the said process comprising the following stages: preparation of the said thermoplastic composition, addition of a sufficient amount of a solid trapping additive exhibiting, at its surface, sites with a basic nature within the Lewis or Brönsted meaning. The trapping additive is a porous zeolite, the diameter of the pores of which is between 5 and 15 angströms, preferably between 6 and 13 angströms. The invention also relates to the composition obtained by such a process and to the blends comprising such a composition.

Abstract: For trapping a residual monomer containing an expoxide function that has not reacted by copolymerization or by grafting, in a thermoplastic composition based on a copolymer of ethylene and/or propylene, a sufficient amount of an acidic trapping additive is added to remove the residual monomer. The trapping additive is preferably a porous zeolite with a pore diameter of between 2 and 10 angstroms. Improved compositions and blends are thereby obtained.

Abstract: The invention relates to a process for trapping a free monomer which has not reacted by copolymerization or by grafting comprising at least one epoxide functional group in a thermoplastic composition based on ethylene and/or on propylene and based on at least one monomer comprising at least one epoxide functional group. The process can comprise the following stages: (i) preparation of the thermoplastic composition; and (ii) addition of a sufficient amount of a solid trapping additive exhibiting, at its surface, sites with a basic nature within the Lewis or Brönstead meaning. The trapping additive comprises a porous zeolite, the diameter of the pores of which is between 5 and 15 angströms, preferably between 6 and 13 angströms. The invention also relates to the composition obtained by such a process and to the blends comprising such a composition.

Abstract: The invention relates to a continuous process for the manufacture of PVDF homopolymer or copolymer. The optional comonomer comprises a vinyl group polymerized by free radicals, and comprises at least one fluorine atom, a fluoroalkyl group or a fluoroalkoxy group, directly attached to this vinyl group. The invention also relates to PVDF homopolymers made by processes of the invention. The invention further relates to a process for deoxygenating a flow.

Abstract: The present invention relates to a process for the radical polymerization or copolymerization of ethylene under high pressure in the presence of at least one polymerization initiating-controlling compound capable of providing, by decomposition under the polymerization or copolymerization conditions: at least one initiating free radical (Z) which carries at least one site for initiating the (co)polymerization; and at least one stable free radical (SFR) which carries at least one site exhibiting the stable radical state and which is stable under the polymerization conditions, with, in total, as many initiating sites as sites exhibiting the stable radical state.

Abstract: The invention relates to a continuous process for the manufacture of PVDF homopolymer or copolymer. The optional comonomer comprises a vinyl group polymerized by free radicals, and comprises at least one fluorine atom, a fluoroalkyl group or a fluoroalkoxy group, directly attached to this vinyl group. The invention also relates to PVDF homopolymers made by processes of the invention. The invention further relates to a process for deoxygenating a flow.

Abstract: Polymers are obtained by a radical (co)polymerization of ethylene under high pressure in the presence of at least one initiating free radical (Z*) and of at least one controlling stable free radical (SFR*) which comprises the indoline nitroxide backbone represented by the formula (I). A is a hydrocarbonaceous chain forming an aromatic ring with the two carbon atoms to which it is attached, this ring being able to carry substituents or being able to carry one or more rings placed side by side, which rings are aromatic or aliphatic and optionally substituted, the carbon atoms forming the nitrogenous ring and in the alpha- and beta-position with respect to the nitrogen atom being, able to carry hydrogen atoms or substituents.

Abstract: A radical (co)polymerization of ethylene is carried out under high pressure in the presence of at least one initiating free radical (Z&Circlesolid;) and of at least one controlling stable free radical (SFR&Circlesolid;) which comprises the indoline nitroxide backbone represented by the formula (I). Mention may be made, by way of examples, of the radicals (SFR&Circlesolid;) of formula (II).

Abstract: The invention relates to a process for trapping a residual monomer that has not reacted by copolymerization or by grafting, comprising at least one epoxide function, in a thermoplastic composition based on a copolymer of ethylene and/or propylene and of at least one monomer comprising at least one epoxide function, the said process comprising the following steps:

Abstract: The invention relates to a process for trapping a free monomer which has not reacted by copolymerization or by grafting comprising at least one epoxide functional group in a thermoplastic composition based on ethylene and/or on propylene and based on at least one monomer comprising at least one epoxide functional group, the said process comprising the following stages:

Abstract: A radical (co)polymerization of ethylene is carried out under high pressure in the presence of at least one initiating free radical (Z•) and of at least one controlling stable free radical (SFR•) which comprises the indoline nitroxide backbone represented by the formula (I). A is a hydrocarbonaceous chain forming an aromatic ring with the two carbon atoms to which it is attached, this ring being able to carry substituents or being able to carry one or more rings placed side by side, which rings are aromatic or aliphatic and optionally substituted, the carbon atoms forming the nitrogenous ring and in the alpha- and beta-position with respect to the nitrogen atom being able to carry hydrogen atoms or substituents.

Abstract: The invention relates to a process for the radical polymerization of at least one monomer in the presence of at least two stable free radicals of different natures. The use of two different stable free radicals is reflected by a higher productivity than that which would be expected on calculating the arithmetic mean of the productivities obtained with each of the stable free radicals when they are used individually.

Abstract: The invention relates to a process for preparing alkoxyamines. This process consists in mixing, in an organic solvent, a metal salt, a ligand for the metal, a halocarbon compound ZX and a nitroxide, in keeping the reaction medium stirring at a temperature of between 20° C. and 90° C. until the nitroxide has disappeared, in recovering the organic phase, in washing it with water and then in isolating the alkoxyamine by evaporating the organic solvent under reduced pressure.

Abstract: The invention relates to a continuous process for the manufacture of PVDF homopolymer or copolymer. The optional comonomer comprises a vinyl group polymerized by free radicals, and comprises at least one fluorine atom, a fluoroalkyl group or a fluoroalkoxy group, directly attached to this vinyl group. The invention also relates to PVDF homopolymers made by processes of the invention. The invention further relates to a process for deoxygenating a flow.

Abstract: A radical (co)polymerization of ethylene is carried out under high pressure in the presence of at least one initiating free radical (Z•) and of at least one controlling stable free radical (SFR•) which comprises the indoline nitroxide backbone represented by the formula (I). Mention may be made, by way of examples, of the radicals (SFR•) of formula (II).

Abstract: The invention provides a method comprising contacting, between 100° C. and 230° C. and under agitation, an elastomer, a functionalising agent and optionally, a peroxide compound. The functionalising agent is a thiolcarboxylic acid polyester or a reaction product of a thiolcarboxylic acid or ester with ethylene sulphide. The functionalised elastomer can also be pre-formed, then incorporated into the bitumen. The resulting compositions are usable directly or after dilution, for forming bituminous binders to produce surfacing, coating and waterproofing materials.

Abstract: This process is characterized in that at least one of the said monomers is polymerized or copolymerized in bulk, solution, emulsion or suspension at a temperature which may be as low as 0.degree. C., in the presence of an initiator system comprising at least one radical-generator compound other than an arenesulphonyl chloride; and at least one catalyst consisting of a metal complex represented by the following formula (I): Ma.sub.a (L).sub.n in which: M represents Ni, Pd or Pt; A represents a halogen or a pseudohalide; the groups L are ligands of the metal M, which are chosen independently from those containing at least one from among N, P, As, Sb, and Bi, it being possible for at least two of these ligands to be connected together by one or more divalent radicals; a is an integer from 1 to 5; n is an integer from 1 to 4; with 4.ltoreq.a+n.ltoreq.6, a+n representing the coordination number of the complex.