Patent ID: 7091308

Claim:
A chain extended dendritic polyether comprising a dendritic core polymer and a chain extension bonded to said dendritic core polymer, which chain extended dendritic polyether optionally is at least partially chain terminated or functionalised wherein said core polymer is a polyhydric dendritic polyether obtained by ring opening addition of at least one oxetane to a di, tri or polyhydric core molecule at a molar ratio yielding a polyhydric dendritic polyether comprising a core molecule and at least one branching generation bonded to at least one hydroxyl group in said di, tri or polyhydric core molecule, and that said chain extension is obtained by addition of at least one alkylene oxide to at least one hydroxyl group in said core polymer at a molar ratio of said core polymer to said alkylene oxide of between 1:1 and 1:100.