Set polyacrylonitrile filaments and fibers, and a process for th

Details Set polyacrylonitrile filaments and fibers, and a process for th Set polyacrylonitrile filaments and fibers, and a process for th

1982-03-18

1984-05-01

Lesmes, George F.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

2642107, D02G 300, D01D 512

Patent

active

044462069

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: 3814739 (1974-06-01), Takeda
patent: 3984601 (1976-10-01), Blickenstaff
patent: 4140844 (1976-02-01), Lohwasser
patent: 4331732 (1982-05-01), Palethorpe

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