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US 5,455,114 AGranted
Water soluble polyvinyl alcohol-based fiber
AssigneeKuraray Co., Ltd.
InventorsAkio Ohmory, Tomoyuki Sano, Syunpei Naramura, Satoru Kobayashi
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AssigneeKuraray Co., Ltd.
InventorsAkio Ohmory, Tomoyuki Sano, Syunpei Naramura, Satoru Kobayashi
Estimating the term…
The process of the present invention comprises wet spinning or dry-jet-wet spinning a PVA-based polymer soluble in water at not more than 100.degree. C. while using a dope solvent and a solidifying solvent each comprising an organic solvent, wet drawing the solidified filaments, subjecting the drawn filaments to extraction treatment and then drying, and further subjecting the filaments to heat shrinking treatment under multi-stage temperature elevation condition. The water soluble fibers of the present invention obtained by this process, while having a low water dissolution temperature of not more than 100.degree. C., have a markedly small maximum shrinkage in water and has high tensile strength and small ash content. The water soluble fibers of the present invention are suitably used for chemical lace base fabrics and blended yarns with wool or jute.
A water soluble homo- or copolymeric polyvinyl alcohol fiber having a surface, a water dissolution temperature (T .degree.C.) of 0.degree. to 100.degree. C., a maximum shrinkage in water of not more than 20%, a tensile strength of at least 3 g/d, an ash content of not more than 1% and a dimensional change ratio (S)% at 20.degree. C. 93% relative humidity satisfying the following conditions:
Dependencies are inferred from the claim text.