Claims
- 1. A polypropylene fibre for reinforcing cement comprising a drawn fibre of highly crystalline polypropylene having a fibre breakage strength of at least 6 g/denier and having Q<5, 97<HI<100, and 94<IPF<100, wherein Q represents the ratio of weight-average molecular weight to number-average molecular weight, HI represents the insoluble content of boiling n-heptane in wt % and IPF represents the isotactic pentad fraction in mol %, said fibre comprising from 0.05 to 10% by weight of a hydrophilizing agent, which is insolubilized on the fibre surface by reacting with calcium ions.
- 2. The polypropylene fibre for reinforcing cement according to claim 1, wherein the fibres possess a fibre breakage strength of 9 g/denier or more and are made of highly crystalline polypropylene having Q.ltoreq.4.5, HI.gtoreq.98 and IPF.gtoreq.96.
- 3. The polypropylene fibre for reinforcing cement according to claim 1, wherein said hydrophilizing agent is an alkylphosphate alkaline metal salt with 8 to 18 carbon atoms.
- 4. The polypropylene fibre for reinforcing cement according to claim 1, wherein said fibres have a fibre fineness in a range of 0.5<d<20, where d represents denier.
- 5. The polypropylene fibre for reinforcing cement according to claim 1, wherein said fibre length ranges from 2 to 15 mm.
- 6. The polypropylene fibre for reinforcing cement according to claim 1, wherein said fibre length ranges between 5 and 10 mm.
- 7. The polypropylene fibre for reinforcing cement according to claim 1, wherein a section of the fibre is substantially circular, substantially X-shaped cross-section, or substantially Y-shaped cross-section.
- 8. The polypropylene fiber for reinforcing cement according to claim 1, wherein said fiber is crimped.
- 9. The polypropylene fiber for reinforcing cement according to claim 1, wherein said fiber further comprises fillers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-282268 |
Oct 1991 |
JPX |
|
Parent Case Info
This application is a continuation of U.S. application Ser. No. 07/936,000 filed Aug. 27, 1992, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
A-0 081 265 |
Jun 1983 |
EPX |
A-0 225 036 |
Jun 1987 |
EPX |
A- 0 343 148 |
Nov 1989 |
EPX |
A-2 448 516 |
Sep 1980 |
FRX |
Continuations (1)
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Number |
Date |
Country |
Parent |
936000 |
Aug 1992 |
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