Porous polymeric films

Details Porous polymeric films Porous polymeric films

1981-03-31

1983-05-31

Herbert, Jr., Thomas J.

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Structurally defined web or sheet

Including components having same physical characteristic in...

264176R, 428220, 428523, 521 56, 521 63, 521 90, 521 94, 526348, 526351, B32B 702, B32B 2732, B28B 320

Patent

active

043861296

ABSTRACT:
This invention relates to porous films having pores with polygonal cross sections and average pore diameters of about 3 to about 100 microns and the method for preparing these films. More particularly this invention relates to a porous film having pores with polygonal cross sections and average pore diameters of about 3 to about 100 microns formed from a resinous polymer of propylene and the process for forming the film which comprises the steps of (a) forming a film containing beta-spherulites and (b) selectively extracting the beta-spherulites.

REFERENCES:
patent: 3607793 (1971-09-01), Mahlman
patent: 3839240 (1974-10-01), Zimmerman
patent: 3956020 (1976-05-01), Weininger et al.
patent: 4076656 (1978-02-01), White et al.
patent: 4185148 (1980-01-01), Sato et al.
H. Leugering et al., Die Angew. Mapro. Chem., 33, 17 (1973).
Technology, Dec. 1978, C & EN, pp. 23-24.
A. A. Duswalt et al., Amer. Chem. Soc. Div. Org. Cont., 30, No. 2, 93 (1970), pp. 148-155.
H. Dragaun et al., Journal of Polymer Science, Vol. 15, (1977), pp. 1779-1789.
A. Jones et al., Makromal. Chem., 75, pp. 134-158, (1964).
H. Leugering, Makromal. Chem., 109, 204, (1967).

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