Abstract: A polyurethane obtained by reaction between (i) at least one homopolymer obtained by homopolymerization of ?-caprolactone, and (ii) at least one dissocyanate, wherein said reaction between (i) and (ii) and said homopolymerization are performed in presence of a catalyst selected from (a) a catalyst containing bismuth ethylhexanoate and ethylhexanoic acid, (b) a catalyst containing bismuth ethylhexanoate and bismuth neodecanoate, and (c) a catalyst containing zinc neodecanoate and zinc oxide.

Abstract: A polyurethane obtained by reaction between (i) at least one homopolymer obtained by homopolymerisation of ?-caprolactone, and (ii) at least one dissocyanate, wherein said reaction between (i) and (ii) and said homopolymerisation are performed in presence of a catalyst selected from (a) a catalyst containing bismuth ethylhexanoate and ethylhexanoic acid, (b) a catalyst containing bismuth ethylhexanoate and bismuth neodecanoate, and (c) a catalyst containing zinc neodecanoate and zinc oxide.

Abstract: The present invention provides a composition wherein a homo-polymer or copolymer of caprolactone has been produced by polymerising caprolactone, optionally with a co-monomer, in the presence of a polymerisation catalyst and an initiator, and the use of such a composition according for the manufacture of a polyurethane. The present invention further provides a process for the production of a homopolymer or a co-polymer of caprolactone comprising polymerising a composition comprising: (i) at least one caprolactone monomer and optionally a co-monomer; and (ii) a catalyst comprising (a) bismuth ethylhexanoate and ethylhexanoic acid, (b) bismuth ethylhexanoate and bismuth neodecanoate, or (c) zinc neodecanoate and zinc oxide.