Patent ID: 6613257
Filing Date: 2003-09-02
Classification: C08G,D01F,Y10T

Abstract:
A process comprising the steps of:(A) forwarding aromatic polyester melt to an injection position in a twin screw extruder wherein said aromatic polyester melt has (i) an intrinsic viscosity which is measured in a 60/40 by weight mixture of phenol and tetrachloroethane and is at least about 0.6 deciliter/gram and (ii) a Newtonian melt viscosity which is calculated to be at least about 7,000 poise at 280Â° C.; (B) injecting lactone monomer into said molten aromatic polyester of said step (A); (C) dispersing said injected lactone monomer into said aromatic polymer melt so that a uniform mixture forms in less than about thirty seconds; and (D) reacting said uniform mixture from step (C) at a temperature from about 250Â° C. to about 280Â° C. to form a block copolymer wherein said steps (A) to (D) occur in less than about four minutes residence time in the twin screw extruder.