Process for profile extrusion of a polyester

In a process for producing a profile by profile extrusion of a thermoplastic resin wherein a melt of the thermoplastic resin at a melt temperature is extruded through a die to from the profile, the improvement comprising using as the thermoplastic resin a polyester composition having an inherent viscosity of at least 0.65 dl/g and comprising:

• (a) a diacid component comprising 100 to 98.0 mole percent of residues of a primary acid selected from the group consisting of terephthalic acid, napthalenedicarboxylic acid, isophthalic acid and mixtures thereof;
• (b) a glycol component comprising 100 to 98.0 mole percent of residues of a primary glycol comprising 57 to 90 mole percent ethylene glycol, 10 to 40 mole percent 1,4-cyclohexanedimethanol or neopentyl glycol, and 0 to 3 mole percent diethylene glycol;
• and
• (c) 0.05 to 2.0 mole percent of residues of a branching agent selected from the group consisting of an acidic branching agent comprising tri-functional or greater monomer, an alcoholic branching agent comprising tri-functional or greater monomer, and mixtures thereof;
• wherein the polyester composition is based on 100 mole percent of the diacid component and 100 mole percent of the glycol component and the acidic branching agent comprises a portion of the diacid component and the alcoholic branching agent comprises a portion of the glycol component.