Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1981-03-31
1983-05-31
Herbert, Jr., Thomas J.
Stock material or miscellaneous articles
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.
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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).
Boone David E.
Herbert, Jr. Thomas J.
Magidson William H.
McClain William T.
Standard Oil Company (Indiana)
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