Process for production of set polyacrylonitrile filaments and fi

Details Process for production of set polyacrylonitrile filaments and fi Process for production of set polyacrylonitrile filaments and fi

1983-12-07

1985-08-20

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264206, 2642108, 2642356, D01F 618

Patent

active

045363633

ABSTRACT:
The invention relates to filaments and fibers spun from at least 98% by weight of polyacrylonitrile and relative viscosities of between 2.5 and 6.0 which have tensile strengths of more than 50 cN/tex with an elongation at break of at most 15% and a shrinkage at the boil of less than 5% and to a process for their production which comprises at least 2 stretching stages with a minimum stretching ratio of 1:9 as well as a concluding setting stage in which the filaments are treated without shrinkage in dry heat at 170.degree. to 280.degree. C.
Such filaments and fibers are distinguished by an increased resistance to swelling and hydrolysis and they are particularly suitable for reinforcing organic and inorganic materials.

REFERENCES:
patent: 4205037 (1980-05-01), Fujimatsu
patent: 4383086 (1983-05-01), Fester et al.
patent: 4421708 (1983-12-01), Reichaudt et al.

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