Polyester composition with improved dyeing properties

1. A composition with advantages for textile fibers, and consisting essentially of a melt of:

polyester precursors selected from the group consisting of terephthalic acid, dimethyl terephthalate, and ethylene glycol;

between about 4.5 and 5.5 percent adipic acid based on the amount of copolymer;

between about 630 and 770 parts per million (ppm) of pentaerythritol based on the amount of copolymer; and

between about 3.4 and 4.2 percent polyethylene glycol based on the amount of copolymer;

and containing diethylene glycol in an amount of less than 2 percent based on the amount of polyester copolymer;

said melt being maintained at a temperature of between about 285° F. and 295° F., and at an intrinsic viscosity of between about 0.58 and 0.82.

2. A polymerized melt according to claim 1 at an intrinsic viscosity of 0.75.

3. A polyester copolymer filament made from the melt of claim 1 .

4. A dyed yarn formed of a blend of:

cotton fibers; and

staple fibers cut from a textured filament made from the filament of claim 3 .

5. A composition according to claim 1 wherein said pentaerythritol is present in an amount, of about 700 ppm based upon the amount of copolymer.

6. A composition according to claim 1 wherein said adipic acid is present in an amount of about 5 percent based upon the amount of copolymer.

7. A composition according to claim 1 wherein said polyethylene glycol is present in an amount of about 3.8 percent based upon the amount of copolymer.

8. A composition according to claim 7 wherein said polyethylene glycol has a molecular weight of about 400 grams per mole.

9. A textile fabric that comprises:

spandex; and

a polyester copolymer filament according to claim 3 .

10. A dyed knitted fabric according to claim 9 .

11. A dyed woven fabric according to claim 10 .