| (19) |
 |
|
(11) |
EP 0 313 068 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
09.05.1990 Bulletin 1990/19 |
| (43) |
Date of publication A2: |
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26.04.1989 Bulletin 1989/17 |
| (22) |
Date of filing: 21.10.1988 |
|
| (51) |
International Patent Classification (IPC)4: D01F 6/14 |
|
| (84) |
Designated Contracting States: |
|
BE CH DE ES FR GB IT LI |
| (30) |
Priority: |
22.10.1987 JP 267929/87
27.10.1987 JP 272158/87
29.10.1987 JP 274784/87
28.12.1987 JP 333845/87
11.02.1988 JP 29383/88
|
| (71) |
Applicant: KURARAY CO., LTD. |
|
Kurashiki-City
Okayama Prefecture 710 (JP) |
|
| (72) |
Inventors: |
|
- Mizobe, Akio
Okayama-City
Okayama-Pref. (JP)
- Saeki, Tomoo
Kurashiki-City
Okayama-Pref. (JP)
- Nishiyama, Masakazu
Okayama-City
Okayama-Pref. (JP)
- Sakuragi, Isao
Okayama-City
Okayama-Pref. (JP)
- Akiyama, Akitsugu
Soja-City
Okayama-Pref. (JP)
- Hoshiro, Hideki
Okayama-City
Okayama-Pref. (JP)
- Sugishima, Hiroshi
Okayama-City
Okayama-Pref. (JP)
|
| (74) |
Representative: VOSSIUS & PARTNER |
|
Postfach 86 07 67
81634 München
81634 München (DE) |
|
| |
|
| (54) |
Polyvinyl alcohol-based synthetic fibers having a slender cross-sectional configuration
and their use for reinforcing shaped articles |
(57) Described is the spinning of a boric acid-containing aqueous polyvinyl alcohol solution
in an alkaline coagulation bath. The coagulation bath is maintained at a temperature
of 55 to 95°C. The resulting tow of monofilaments is drawn in a draw ratio of not
less than 17. This process provides polyvinyl alcohol-based synthetic fibers having
a slender cross-sectional configuration and superior mechanical properties. By using
these fibers as a reinforcement material for synthetic resins, rubbers, hydraulic
inorganic materials, etc., there can be obtained shaped articles possessing improved
mechanical properties.