Abstract: Process for manufacturing a polymer by polycondensation of a hydroxy acid, said polymer comprising at least 80% by weight of units that correspond to the hydroxy acid, according to which at least one polyfunctional reactant capable of giving rise to the formation of a three-dimensional polymer network is mixed with the hydroxy acid, and according to which the mixture is subjected to temperature and pressure conditions and for a duration which are all suitable for giving rise to the formation of the network. Poly(hydroxy acid) (PHA) obtainable by such a process.

Abstract: Process for manufacturing a polymer by polycondensation of a hydroxy acid, said polymer comprising at least 80% by weight of units that correspond to the hydroxy acid, according to which at least one polyfunctional reactant capable of giving rise to the formation of a three-dimensional polymer network is mixed with the hydroxy acid, and according to which the mixture is subjected to temperature and pressure conditions and for a duration which are all suitable for giving rise to the formation of the network. Poly(hydroxy acid) (PHA) obtainable by such a process.

Abstract: Process for manufacturing a polymer by polycondensation of a hydroxy acid, said polymer comprising at least 80% by weight of units that correspond to the hydroxy acid, according to which at least one polyfunctional reactant capable of giving rise to the formation of a three-dimensional polymer network is mixed with the hydroxy acid, and according to which the mixture is subjected to temperature and pressure conditions and for a duration which are all suitable for giving rise to the formation of the network. Poly(hydroxy acid) (PHA) obtainable by such a process.

Abstract: Process for the synthesis of a cyclic diester of an alpha-hydroxyacid, comprising the following steps: an alkalino-earth salt of the corresponding alpha-hydroxyacid is mixed with said alpha-hydroxyacid and water; the mixture is treated by evaporation-crystallization, so that a hydrate of the alkalino-earth salt of the linear dimer of the corresponding alpha-hydroxyacid precipitates; the hydrated salt is dehydrated to give the corresponding anhydrous salt; and the anhydrous salt is pyrolyzed, releasing the cyclic diester of the corresponding alpha-hydroxyacid and leaving the alkalino-earth hydroxide as solid residue.

Abstract: Polymer compositions with adhesive properties comprising: (1) at least one fluoropolymer (A) grafted by at least one compound (a), wherein the compound (a) contains at least one functional group (f1) capable of conferring adhesion properties on the fluoropolymer; (2) at least one olefin polymer (B) grafted by at least one compound (b), wherein the compound (b) contains at least one functional group (f2) capable of conferring adhesion properties on the olefin polymer and of reacting with the functional group (f1) contained in the compound (a); and (3) at least one polymer (C) chosen from polyesters and polyamides.

Abstract: Process for manufacturing a polymer by polycondensation of a hydroxy acid, said polymer comprising at least 80% by weight of units that correspond to the hydroxy acid, according to which at least one polyfunctional reactant capable of giving rise to the formation of a three-dimensional polymer network is mixed with the hydroxy acid, and according to which the mixture is subjected to temperature and pressure conditions and for a duration which are all suitable for giving rise to the formation of the network. Poly(hydroxy acid) (PHA) obtainable by such a process.

Abstract: Aqueous emulsion comprising: (i) at least one functionalized polyolefin (gPO), obtained by grafting, on at least one unfunctionalized polyolefin (PO), acid and/or anhydride groups, the acid and/or anhydride groups being optionally completely or partially neutralized by at least one neutralizing agent; (ii) at least one emulsifier; (iii) at least one dispersant containing water; and (iv) carbon nanotubes.

Abstract: Process for the synthesis of a cyclic diester of an alpha-hydroxyacid, comprising the following steps: an alkalino-earth salt of the corresponding alpha-hydroxyacid is mixed with said alpha-hydroxyacid and water; the mixture is treated by evaporation-crystallization, so that a hydrate of the alkalino-earth salt of the linear dimer of the corresponding alpha-hydroxyacid precipitates; the hydrated salt is dehydrated to give the corresponding anhydrous salt; and the anhydrous salt is pyrolyzed, releasing the cyclic diester of the corresponding alpha-hydroxyacid and leaving the alkalino-earth hydroxide as solid residue.

Abstract: Process for modifying a polyolefin grafted with acid or anhydride groups, by at least partial neutralization of these groups with at least one neutralizing agent comprising an organic salt (1) that releases an organic acid (I) during the neutralization, according to which the organic acid (I) derived from the neutralization of the grafted polyolefin is reacted with at least one inorganic salt (2). Modified polyolefin (that can be) obtained by the process described above. Polymeric composition containing (A) at least one polymer, and (B) at least one modified polyolefin (that can be) obtained by the process above. Article comprising the modified polyolefin or the composition described above.

Abstract: Process for modifying a polyolefin grafted with acid or anhydride groups, by at least partial neutralization of these groups with at least one neutralizing agent comprising an organic salt (1) that releases an organic acid (I) during the neutralization, according to which the organic acid (I) derived from the neutralization of the grafted polyolefin is reacted with at least one inorganic salt (2). Modified polyolefin (that can be) obtained by the process described above. Polymeric composition containing (A) at least one polymer, and (B) at least one modified polyolefin (that can be) obtained by the process above. Article comprising the modified polyolefin or the composition described above.

Abstract: Aqueous emulsion comprising: (i) at least one functionalized polyolefin (gPO), obtained by grafting, on at least one unfunctionalized polyolefin (PO), acid and/or anhydride groups, the acid and/or anhydride groups being optionally completely or partially neutralized by at least one neutralizing agent; (ii) at least one emulsifier; (iii) at least one dispersant containing water; and (iv) carbon nanotubes.

Abstract: Polymer compositions with adhesive properties comprising: (1) at least one fluoropolymer (A) grafted by at least one compound (a) containing at least one functional group (f1) capable of conferring adhesion properties on said polymer; (2) at least one polyolefin (B) grafted by at most 4% by weight, relative to the weight of polyolefin (B), of at least one compound (b) containing at least one functional group (f2) chosen from acid and anhydride groups, optionally completely or partially neutralized by at least one neutralizing agent; and (3) at least one olefin copolymer (C), for which at least 5% by weight of the repeat units are derived from at least one functional monomer (f3) capable of reacting with the functional group (f1) contained in the compound (a).

Abstract: Polymer compositions with adhesive properties comprising: (1) at least one fluoropolymer (A) grafted by at least one compound (a), wherein the compound (a) contains at least one functional group (f1) capable of conferring adhesion properties on the fluoropolymer; (2) at least one olefin polymer (B) grafted by at least one compound (b), wherein the compound (b) contains at least one functional group (f2) capable of conferring adhesion properties on the olefin polymer and of reacting with the functional group (f1) contained in the compound (a); and (3) at least one polymer (C) chosen from polyesters and polyamides,

Abstract: Article comprising at least one substrate (S) comprising at least one polyolefin composition (C1) comprising at least one nonfunctionalized polyolefin (PO1), the said substrate comprising a surface, and at least one layer (?) coating at least a portion of the surface of the said substrate, the said layer (?) being composed of at least one polyolefin composition (C2) comprising at least one functionalized polyolefin (POg) obtained by grafting acid and/or anhydride groups to at least one nonfunctionalized polyolefin (PO2), the acid and/or anhydride groups optionally being neutralized in all or in part by at least one neutralizing agent, and at least one emulsifying agent. Process for the manufacture of such an article. Improvement in the antistatic properties of the substrate (S) by means of the layer (?).

Abstract: Polymer composition comprising more than 50 % by weight, with respect to the total weight of the composition, of a nonfunctionalized polyolefin (PO1), and more than 0.5 % by weight, with respect to the total weight of the composition, of at least one polyolefin comprising carboxyl grafts [polyolefin (POg)] which is functionalized by grafting using at least one grafting agent chosen from ethylenically unsaturated carboxylic acids, their anhydrides and their metal salts, at least a portion of the carboxyl grafts of which is neutralized by a metal, optionally by the neutralization, concomitant with and/or subsequent to the grafting, of the carboxyl grafts by at least one metal base, and which has been synthesized from a nonfunctionalized polyolefin (PO2), at least 0.5 % by weight and at most 50 % by weight of the repeat units of which are derived from at least one ethylenically unsaturated monomer which has a different chemical nature from that of the repeat units of the nonfunctionalized polyolefin (PO).

Abstract: Use of at least one unmodified polyolefin [polyolefin (P1)] as additive for a polyolefin composition (C2) comprising at least one polyolefin modified by grafting with acid and/or anhydride groups, which groups are optionally completely or partially neutralized by a neutralizing agent [polyolefin (P2)], for improving the level of at least one mechanical property of the polyolefin composition (C2) up to a level which is improved both with respect to that of the mechanical property of the polyolefin composition (C2) and with respect to that of the mechanical property of a polyolefin composition (C1) obtained by replacing, weight for weight in the polyolefin composition (C2), all the modified polyolefin (P2) by the unmodified polyolefin (P1).

Abstract: Process for modifying a polyolefin grafted with acid or anhydride groups, by at least partial neutralization of these groups with at least one neutralizing agent comprising an organic salt (1) that releases an organic acid (I) during the neutralization, according to which the organic acid (I) derived from the neutralization of the grafted polyolefin is reacted with at least one inorganic salt (2). Modified polyolefin (that can be) obtained by the process described above. Polymeric composition containing (A) at least one polymer, and (B) at least one modified polyolefin (that can be) obtained by the process above. Article comprising the modified polyolefin or the composition described above.

Abstract: The invention concerns thermoplastic aliphatic polyester compositions characterized by a melt flow index (RMFI) ranging between 1.1 and 2.5. The invention also concerns a method for preparing said compositions which are used for making films, foams, flasks or thermoformed products. The resulting films obtained from said compositions are used for making litter bags, films for agricultural use, packaging films, shrouds, diaper drawers and adhesive films.

Abstract: Compositions comprising one or more olefin polymers functionalized by at least one functionalization agent chosen from carboxylic acids, their esters, their anhydrides and their metal salts and one or more stabilizing agents comprising one or more sterically hindered phenol groups and at most one ester functional group. Process for their preparation and use of these compositions for compatibilizing olefin polymers with polymers, fillers and metal substrates which are incompatible with olefin polymers.

Abstract: Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of polyesterketone polymers by polymerization of cyclic esterketones and polyesterketone polymers so obtained.