Claims
- 1. A process for forming a thin stretched polypropylene stick comprising:
- extruding a polypropylene resin having a crystallinity of at least 0.945 and a melt flow rate (x) of 0.2 to 20g/10 minutes and satisfying the relationship between x and Q value expressed by the formula y.gtoreq.2x+8 wherein Y represents the Q value;
- stretching the resulting extruded molten stick to a length at least 5 times its original length.
- 2. The process according to claim 1 wherein the extruded molten stick is draft-stretched.
- 3. The process according to claim 1 wherein the extruded molten stick is draw-stretched.
- 4. The process according to claim 1 wherein said extruded molten stick is cooled after extrusion.
- 5. The process according to claim 4 wherein said extruded molten stick is cooled to a temperature in a range above the heat distortion temperature of the polypropylene resin and below the melting temperature thereof.
- 6. The process according to claim 9 wherein the extruded molten stick is both draft-stretched and draw-stretched.
- 7. The process according to claim 1 wherein the polypropylene resin is melt-kneaded prior to extrusion.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-113942 |
May 1987 |
JPX |
|
RELATED APPLICATIONS
This application is a divisional application of Ser. No. 07/187,236, filed Apr. 28, 1988 now U.S. Pat. No. 4,994,325.
US Referenced Citations (13)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1017550 |
Sep 1977 |
CAX |
59-191207 |
Oct 1984 |
JPX |
61-234761 |
Oct 1986 |
JPX |
933524 |
Aug 1963 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
187236 |
Apr 1988 |
|