D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
D01F 6/14 (2006.01) D06M 11/55 (2006.01) D06M 13/12 (2006.01) D06M 13/123 (2006.01) D06M 13/127 (2006.01)
Patent
CA 2071758
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 to 100°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 x 10-3 g/cm d and a dissolution ratio of not more than 40% and being able to withstand an autoclave curing at 140°C which is necessary for securing the dimensional stability of the resulting cement products. -35-
Harada Yasuhiro
Mizobe Akio
Nishiyama Masakazu
Kirby Eades Gale Baker
Kuraray Co. Ltd.
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