(Poly)ol Block Copolymer

Abstract: The present invention relates to (poly)ol block copolymers having a polycarbonate or polyether carbonate, polyester and polyether or ethercarbonate blocks of structure C-B-A'-Z'-Z-(Z'-A'-B-C)n wherein n= t-1 and wherein t= the number of terminal OH group residues on the block A; and wherein each A' is independently a polycarbonate chain having at least 70% carbonate linkages, or a polyethercarbonate chain having at least 30% ether linkages, wherein each B is a (poly)ester block formed by epoxide and cyclic anhydride reaction/copolymerisation and/or cyclic ester ring-opening reaction/polymerisation, and each C is independently a (poly)ethercarbonate or (poly)ether block having 50-100% ether linkages; and wherein Z'-Z-(Z')n is a starter residue. Block B may have one of the following structures wherein n2 is 1 or more and n3/n4 r is 1 or more. The invention extends to higher polymers such as polyurethanes produced from copolymers, compositions and processes of production of such polyols.

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