Fibrous sheet material and method of producing the same
Abstract
Abstract THE FIBROUS SHEET MATERIAL OBTAINED BY THE METHODCOMPRISING: (I) EXTRUDING A MOLTEN MIXTURE OF 30 TO 70 VOLUME PERCENT OF A CRYSTALLINE POLYMER (1) AND 70 TO 30 VOLUME PERCENT OF ANOTHER POLYMER (2), WICH IS INCOMPATIBLE WITH SAID CRYSTALLINE POLYMER (1) AND HAS A LOWER APPARENT MELT VISCOSITY THAN THE CRYSTALLINE POLYMER (1) UNDER THE EXTRUSION CONDITIONS TO MAKE A FILM CONSISTING OF SAID MIXTURE, IN WHICH THE CRYSTALLINE POLYMER (1) FORMS THE DISCONTINUOUS PHASE AND THE LATTER POLYMER (2) FORMS TE CONTINUOUS PHASE IN SAID FILM, AND HAVING THE CRYSTALLINE ORIENTATION IN THE LONGITUDINAL AXIS OF THE FILM; (II) LAMINATING MORE THAN TWO FILMS IN AN ORIENTATION SUCH THAT AT LEAST TWO OF SAID FILMS ARE IN DIRECTIONS AT AN ANGLE OF 60 TO 120* WITTH RESPECT TO EACH OTHER, AND THEN (III) BIAXIALLY STRETCHING SAID LAMINATE TO 2 TO 4 TIMES IN BOTH LENGTHWISE AND CROSSWISE DIRECTIONS SIMULTANEOUSLY TO PRODUCE A FIBROUS SHEET MATERIAL.
Inventors
- 👤 Hidenobu Sogi
Bibliographic Details
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