Branched copolyesters especially suitable for extrusion blow molding
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United States of America Patent
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-
Aug 15, 1995
Grant Date -
N/A
app pub date -
Sep 6, 1994
filing date -
Sep 6, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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 about 40 to 100 mol % terephthalic acid, about 80-98 mol % ethylene glycol, about 0.5-10 mol % 1,4-cyclohexanedimethanol, about 3-10 mol % diethylene glycol, and about 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
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