| (19) |
 |
|
(11) |
EP 0 496 376 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
28.04.1993 Bulletin 1993/17 |
| (43) |
Date of publication A2: |
|
29.07.1992 Bulletin 1992/31 |
| (22) |
Date of filing: 22.01.1992 |
|
| (51) |
International Patent Classification (IPC)5: D01F 6/14 |
|
| (84) |
Designated Contracting States: |
|
DE GB NL |
| (30) |
Priority: |
22.01.1991 JP 23004/91
|
| (71) |
Applicant: UNITIKA LTD. |
|
Amagasaki-shi
Hyogo (JP) |
|
| (72) |
Inventors: |
|
- Mochizuki, Masatsuga,
c/o Unitika Ltd.
Uji-shi,
Kyoto (JP)
- Kooda, Kazutaka,
c/o Unitika Ltd.
Uji-shi,
Kyoto (JP)
- Murakami, Shirou,
c/o Unitika Ltd.
Uji-shi,
Kyoto (JP)
- Nagata, Naohiko,
c/o Unitika Ltd.
Uji-shi,
Kyoto (JP)
- Takagi, Shinya,
c/o Unitika Ltd.
Uji-shi,
Kyoto (JP)
|
| (74) |
Representative: Hansen, Bernd, Dr. Dipl.-Chem. et al |
|
Hoffmann, Eitle & Partner
Patent- und Rechtsanwälte,
Postfach 81 04 20
81904 München
81904 München (DE) |
|
| |
|
| (54) |
Polyvinyl alcohol fiber and process for preparation thereof |
(57) A novel polyvinyl alcohol fiber is provided, which is made of a polyvinyl alcohol
with a polymerization degree ranging from 1,500 to 7,000 and exhibits a tensile strength
of 15 g/d (1.61 GPa) or more, initial elastic modulus of 259 g/d (26.8 GPa) or more,
hot water resistance of 140 °C or higher, and abrasion resistance of 200 or more.
A novel process for the preparation of a polyvinyl alcohol fiber is also provided,
which comprises heat-stretching at a rate ranging from 10 m/min. to 100 m/min. a fiber
made of a polyvinyl alochol having a polymerization degree ranging from 1,500 to 7,000
to which a dehydration reaction-accelerating catalyst is applied.