David E Bosley, Patrick J Duncan: Addition of diethylene glycol in continuous production of polyester yarn. E I Du Pont de Nemours and Company, May 24, 1977: US04025592 (9 worldwide citation)

Polyester texturing feed yarns are produced by preparing an ethylene terephthalate polymer from ethylene glycol plus a small amount of diethylene glycol, and dimethyl terephthalate or terephthalic acid, and melt-spinning the polymer into filaments. The filaments may be partially oriented by spinning ...

Patrick J Duncan: Polyester fibers. E I Du Pont de Nemours and Company, January 4, 1994: USH0001275

Polyester filaments of 0.5-2 denier per filament from ethylene terephthalate polymers modified both by polyethylene oxide and by tetraethyl silicate to give polymers of commercial spinning viscosities, and textile fibers and fabrics having greatly improved dye rates, good color stability to standard ...

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