Process for making polyester blend fiber

Details Process for making polyester blend fiber Process for making polyester blend fiber

1986-05-14

1988-07-05

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

264168, 2642104, 2642105, 2642108, 26421115, 26421117, 264234, 264237, 264345, 264348, 525444, D01F 512, D01F 692

Patent

active

047553367

ABSTRACT:
A process is provided wherein a polymer blend of a poly(butylene terephthalate) and about 5 to 25% by weight of poly(ethylene terephthalate) is melt spun to form a fiber or yarn which is then drawn at an elevated temperature resulting in the poly(butylene terephthalate) having a stable beta crystal form in relaxed condition. The fiber or yarn may then be subjected to a heat relaxation treatment which changes the crystal form of the poly(butylene terephthalate) from the beta to the alpha form resulting in some shrinkage of the fiber or yarn and causing it to have a greater degree of stretchability.

REFERENCES:
patent: 3681188 (1972-08-01), Harris
patent: 3822334 (1974-07-01), Patterson
patent: 4159617 (1979-07-01), Allan

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