Poly(glycidyl ether) block copolymers and process for their preparation

Abstract From the Canadian patent

Under particular conditions a cationic ring-opening polymerization of a first oxirane monomer selected from the group consisting of an acyclic glycidyl ether, a cyclic glycidyl ether and a haloalkyl epoxide, in the, presence of a hydroxyl-containing organic material ("HCM") for example a, polymer (referred to herein as a 'hydroxyl-prepolymer') and a particular, catalyst, produces a polymerization having 'living polymerization' characteristics. The result is that molecular weight (mol wt) of the resulting polymer is directly proportional to the conversion of the monomer to said resulting polymer. This HCM serves as Q chain propagator which initially furnishes OH groups as propagation sites. …