Dual modulus oriented elastomeric filaments

Details Dual modulus oriented elastomeric filaments Dual modulus oriented elastomeric filaments

D - Textiles, Paper

01

F

18/636.1

D01F 6/84 (2006.01) B60N 2/70 (2006.01)

Patent

CA 2002490

An oriented elastomeric filament spun from a thermoplastic elastomeric material selected from the group consisting of a block copolymer of polybutylene terephthalate and polytetramethylene glycol, a block copolymer of polybutylene terephthalate/polybutylene isophthalate and polyethylene glycol/polypropylene glycol, a block copolymer of polybutylene terephthalate/polyhexene terephthalate and polytetramethylene glycol, and a block copolymer of polyurethane and polytetramethylene glycol, the mole fraction of the polybutylene terephthalate, polybutylene terephthalate/polybutylene isophthalate and polybutylene terephthalate/polyhexene terephthalate in the block copolymers is less than 0.5, the elastomeric filament is further oriented after the spinning by stretching at temperatures between 20°C to 120°C to a draw ratio between 500 to 700 percent elongation such that the oriented filament exhibits a two-stage low tensile modulus and high tensile modulus behavior when tested in accordance with ASTM D-638 tensile test in such a way that the high modulus is at least 2 times greater than the low modulus.

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