Eastman-kodak Company

Eastman Chemical Company

Michael L Cassell

James W Mercer, Jr

Randy S Beavers

Joseph Franklin Knight

Karen L Carman

Waylon Lewellyn Jenkins

Gerry Foust Rhodes

Michael James Keegan

James D Small, Jr

A James Cox

W Paul Bell

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:

Branched copolyesters especially suitable for extrusion blow molding

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

The addition of selected combinations of aliphatic and aromatic phosphite compounds to polyester or copolyester blends with polycarbonate results in unexpected improvements to the properties of resulting molding compositions. The molding compositions comprise:

Polyester/polycarbonate blends containing phosphites

Disclosed is a process for the preparation of crystalline copolyesters from substantially amorphous, diethylene glycol-containing copolyesters wherein the a zeolite is incorporated in the substantially amorphous copolyester to promote crystallization upon heating a particulate form of the resulting copolyester at crystallizing effective temperatures.

Process for the preparation of crystalline copolyesters

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Kingsport, TN, United States of America

Michael L Cassell