公开(公告)号：US3654066A

公开(公告)日：1972-04-04

申请号：US3654066D

申请日：1969-04-25

Applicant: KURARAY CO

Inventor： FUKUSHIMA OSAMU ,  ENOMOTO YUYA ,  SAITO YOSHITAMI

IPC: B29C44/56 ,  C08J9/28 ,  D06N3/00 ,  D06N3/14 ,  B32B3/26 ,  B32B27/40

CPC classification number: C08J9/28 ,  B29C44/5627 ,  C08J2201/0544 ,  D06N3/0043 ,  D06N3/14 ,  Y10T428/249953 ,  Y10T428/249979 ,  Y10T442/3325 ,  Y10T442/469 ,  Y10T442/647

Abstract: A POROUS POLYMERIC SHEET HAVING A SPECFIC GRAVITY OF LESS THAN 0.7 AND A THICKNESS OF 0.05 TO 2.0 MM. AND CONTAINING PORES INCLINED AT AN ANGLE OF LESS THAN 80* AGAINST THE PLANE OF THE SHEET AND HAVING A LENGTH OF 0.03 TO 10 MM. A SHEET MATERIAL COMPRISING SAID POROUS POLYMERIC SHEET AND A SUBSTRATE BOUND TO THE LOWER SURFACE OF SAID POROUS POLYMERIC SHEET. SAID POROUS POLYMERIC SHEET IS PRODUCED BY IMMERSING A POLYMER SOLUTION APPLIED TO A SUPPORT INTO A COAGULATION BATH UNDER A CONDITION OF RAPID COAGULATION RAPIDLY THE UPPER PORTION OF THE SOLUTION AND TO FORM MACROPORES IN THE INNER PORTION; STRESSING THE UPPER PORTION IN TRANSVERSE DIRECTION, THAT IS, A DIRECTION PARALLEL TO THE PLANE OF THE SUPPORT, IN THE BATH TO SHIFT THE UPPER PORTION TO TRANSVERSE DIRECTION AND TO INCLINE THE PORES FORMED; TREATING FURTHER THE LAYER WITH THE BATH TO COMPLETE THE COAGULATION, THEREBY FORMING POROUS STRUCTURE CONTAINING PORES INCLINED AT AN ANGLE OF LESS THAN 80* AGAINST THE PLANE; AND PEELING OFF THE RESULTING POROUS POLYMERIC SHEET FROM THE SUPPORT.