Claims
- 1. Process for preparing fibrillated films or flat netlike structures of synthetic polymers and having a specific surface area of more than 12 m.sup.2 /g., the thickness thereof in microns, said process consisting of the following operations:
- (a) preparing a film of at least one orientable synthetic polymer containing an expanding of bulking agent;
- (b) expanding the expanding or bulking agent contained in the film;
- (c) longitudinally or prevailingly longitudinally orienting the expanded film, by stretching with a longitudinal stretch ratio comprised between 3 and 15, with the formation of an oriented film 20 to 200.mu. thick; and
- (d) fissuring or slitting the oriented film.
- 2. The process of claim 1, in which the expansion (b) produces in the film bubbles or cavities with diameters not exceeding 50% of the thickness of the film.
- 3. Process for preparing fibrillated films or flat netlike structures of synthetic polymers and having a specific surface area of more than 12 m.sup.2 /g., the thickness thereof in microns which process comprises the following operations:
- (a') longitudinally prevailingly longitudinally orienting a film made of at least one orientable synthetic polymer, by stretching with longitudinal stretch ratios of between 3 and 15, thereby obtaining an oriented film with from 20 to 200.mu. thickness;
- (b') superficially abrading the oriented film; and
- (c') fissuring or slitting the film thus oriented and abraded.
- 4. The process of claim 3, in which the oriented film (a') is an expanded film, with bubbles inside it having a diameter not exceeding 50% of the thickness of the film.
- 5. Plates and manufacured articles based on hydrosetting binders containing fibrillated films or flat, netlike structures obtained by the process of claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
22,801 A/79 |
May 1979 |
ITX |
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Parent Case Info
This is a continuation of application Ser. No. 526,806, filed Aug. 26, 1983, now abandoned, which in turn is a division of Ser. No. 435,277 filed Oct. 19, 1982 and now abandoned which in turn is a continuation of Ser. No. 150,709 filed May 19, 1980 and now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1073741 |
Jun 1967 |
GBX |
1192132 |
May 1970 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
435277 |
Oct 1982 |
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Continuations (2)
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Number |
Date |
Country |
Parent |
526806 |
Aug 1983 |
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Parent |
150709 |
May 1980 |
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