Polyacrylonitrile fiber with high strength and high modulus of e

Details Polyacrylonitrile fiber with high strength and high modulus of e Polyacrylonitrile fiber with high strength and high modulus of e

1985-09-27

1987-04-14

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C08F 2044

Patent

active

046580042

ABSTRACT:
The invention provides a polyacrylonitrile fiber having a tensile strength above 13 g/d and a modulus of elasticity above 2.4.times.10.sup.11 dyne/cm.sup.2, which is useful for tire cords, fiber-reinforced composite materials, precursors for producing carbon fiber, etc. The fiber is produced by integrally combining technical means which comprise using a polymer composed mainly of acrylonitrile whose weight average molecular weight is more than 400,000 and Mw/Mn ratio is less than 7.0; preparing a spinning solution from the polymer; spinning the solution into filaments; subjecting the resulting filaments to multistage stretching; and drying the filaments, all these steps being conducted under particular conditions.

REFERENCES:
patent: 3975337 (1976-08-01), Reinehr
patent: 4108845 (1978-08-01), Reinehr
patent: 4140844 (1979-02-01), Lohwasser
patent: 4421708 (1983-12-01), Reichardt
patent: 4540754 (1985-09-01), Kobashi

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