Polyvinyl alcohol-based synthetic fiber

Details Polyvinyl alcohol-based synthetic fiber Polyvinyl alcohol-based synthetic fiber

1992-06-23

1995-01-10

Reddick, Judy M.

Stock material or miscellaneous articles

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

Rod, strand, filament or fiber

525 60, 525 61, D02G 300

Patent

active

053805887

ABSTRACT:
Provided are polyvinyl alcohol-based synthetic fiber having excellent performances as a fiber for FRC that is prepared by autoclave curing and its very effective production processes. One of the processes comprises having a monoaldehyde or a dialdehyde or its acetalization product penetrate into the central region of a polyvinyl alcohol-based synthetic fiber at a first stage and then, at a second stage, effecting crosslinking reaction with a mixed solution containing a monoaldehyde and an acid. The other process comprises conducting acetalization with a bath containing 100 to 250 g/l of formaldehyde and 30 to 80 g/l of sulfuric acid at a temperature of 70.degree. to 100.degree. C. The processes can give a polyvinyl alcohol-based synthetic fiber having a strength of at least 11 g/d, a gel elasticity of at least 6.0.times.10.sup.-3 g/cm.multidot.d and a dissolution ratio of not more than 40% and being able to withstand an autoclave curing at 140.degree. C. which is necessary for securing the dimensional stability of the resulting cement products.

REFERENCES:
patent: 3080207 (1963-03-01), Tanabe et al.
patent: 3741724 (1973-06-01), Harmon
patent: 3850901 (1974-11-01), Tanaka et al.
WPIL, File Supplier, Derwent Publications Ltd., London, GB; AN-91-327862 & JP-A-3 213 510 (Unikita KK) 18, Sep. 1991.

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