Claims
- 1. Method of making a polyolefin web, said method comprising the sequential steps of
- a) extruding molten polyolefin resin from an extruder,
- b) then blending into the molten polymer a nonionic surfactant in a mixing means at a location adjacent a die and at a temperature such that the surfactant is not significantly degraded,
- c) forming the blend from the die into blown microfibers, and
- d) collecting the blown microfibers into a coherent web-having a web wet strength at least 130% of its web dry strength.
- 2. Method as defined in claim 1 and comprising subsequent to step d) the step of consolidating the surface of the web without densifying the web.
- 3. Method as defined in claim 1 wherein the polyolefin is polypropylene.
- 4. Method as defined in claim 3 wherein the amount of surfactant added at step b) is from 6 to 25 parts per 100 parts by weight of the polypropylene.
- 5. Method as defined in claim 1 wherein the blending temperature in step b) is no greater than 350.degree. C.
- 6. Method of as defined in claim 1 wherein said mixing means is a static mixer.
Parent Case Info
This is a division of application Ser. No. 07/341,498 filed Apr. 21, 1989, now U.S. Pat. No. 4,933,229.
US Referenced Citations (9)
Foreign Referenced Citations (4)
Number |
Date |
Country |
153886 |
Sep 1951 |
AUX |
1199969 |
Sep 1965 |
DEX |
2543781 |
Apr 1976 |
DEX |
0710824 |
Jan 1980 |
SUX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
341498 |
Apr 1989 |
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