BRANCHED COPOLYESTERS ESPECIALLY SUITABLE FOR EXTRUSION BLOW MOLDING

摘要

Disclosed are polyester particles adapted to be extrusion blow molded into articles having improved rheological qualities and a process for producing such particles, said particles comprising a polyester having repeat units from 40 to 100 mol % terephthalic acid, 80-98 mol % ethylene glycol, 0.5-10 mol % 1,4-cyclo-hexanedimethanol, 3-10 mol % diethylene glycol, and 0.05-1.0 mol % of a polyfunctional branching agent, the molecular weight gradient from core to surface of said particles satisfying the following parameters: (A) number average less than 5500, (B) weight average less than 35,000, and (C) Z average less than 110,000.