High modulus polyester yarn for tire cords and composites

Details High modulus polyester yarn for tire cords and composites High modulus polyester yarn for tire cords and composites

D - Textiles, Paper

01

D

D01D 5/088 (2006.01) D01F 6/62 (2006.01)

Patent

CA 2126328

Yarns are prepared by spinning PEN or other semi-crystalline polyester polymers made from similarly rigid monomer combinations to a state of optimum amorphous orientation and crystallinity. This is accomplished by selection of process par- ameters to form an undrawn polyester yarn of birefringence at least 0.030. The spun yarn is then hot drawn to a total draw ratio of between 1.5/1 and 6.0/1 with the resulting drawn semi-crystalline polyester yarn having Tg greater than 100°C and a melting point elevation at least 8°C. The preferred yarn has a tenacity at least 6.5 g/d; dimensional stability (EASL + Shrinkage) of less than 5 %, and shrinkage 4 % or less. The resulting yarn exhibits surprisingly high modulus and tenacity together with low shrin- kage when compared to prior art yarns.

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