Polyvinylidene fluoride filaments

Details Polyvinylidene fluoride filaments Polyvinylidene fluoride filaments

1979-08-23

1981-11-24

Woo, Jay H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

2642107, 2642356, 2642905, 526255, C08F 1422

Patent

active

043025560

ABSTRACT:
An improved polyvinylidene fluoride resin-made filament. It consists substantially of a blend of 99-wt. % of a first polyvinylidene fluoride resin component having an inherent viscosity higher than 1.30 dl/g on the one hand, and 1-60 wt. % of a second polyvinylidene fluoride component having an inherent viscosity lower than 1.20 dl/g on the other. The blend has a critical shearing stress lower than 2.8.times.10 dyne/cm.sup.2 and is subjected to melt-spinning and successively to a primary and a secondary stretching in a temperature region of 70.degree.-180.degree. C. The overall stretch factor is selected to be 4-10.

REFERENCES:
patent: 3197538 (1965-07-01), Capron et al.
patent: 3925339 (1975-12-01), Ishii et al.
patent: 4052550 (1977-10-01), Chion et al.
patent: 4076929 (1978-02-01), Dohany
patent: 4094949 (1978-06-01), Yokohawa et al.

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