Patent ID: 6767949
Filing Date: 2004-07-27
Classification: C08K

Abstract:
A composition comprising,a) at least one oligomer, cooligomer, polymer or copolymer, containing a stable free nitroxyl radical andb) a reducing agent; which olipomer, cooligomer, polymer or copolymer is obtained by radical polymerization or by grafting, which polymerization has been carried out in the presence of a stable free nitroxyl radical and a source of free radicals capable of initiating the polymerization, or in the presence of a nitroxyl ether wherein X represents a group having at least one carbon atom and is such that the free radical derived from X is capable of initiating polymerization and the remaining radical is a stable free nitroxyl radical, andwhich grafting has been carried out in the presence of a nitroxyl radical or a nitroxyl ether; and which reducing agent is a cyclic ethylenically unsaturated compound having an allylic hydrogen atom, a phosphorus compound selected from the group consisting of H3PO2 (phosphinic acid), H4P2O4 (hypodiphosphonic acid), H3PO3/H4P2O5 (phosphonic-/diphosphonic acid), H4P2O6 (hypodiphosphoric acid) and the ammonium, alkali metal or alkali earth metal salts thereof, or a sulfur compound selected from the group consisting of H2S2O2/H2S2O3 (sulfoxylic-/thiosulfuric acid), H2S2O4 (dithionic acid), H2SO3/H2S2O5 (sulfurous-/disulfurous acid), Râ€”Sâ€”OH (sulfenic acid), Râ€”S&boxH;Oâ€”OH (sulfinic acid) and the ammonium, alkali metal or alkali earth metal salts thereof, or a mixture thereof; and with the proviso that the composition is essentially free of a polymerizable monomer.