Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1990-10-10
1993-03-23
Sluby, P. C.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
4283184, 4283197, 4283199, 428331, 428517, 428521, 428328, 428516, B32B 326, B32B 516
Patent
active
051962624
ABSTRACT:
Microporous material comprises: (1) a matrix comprising a mixture of substantially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 10 deciliters/gram and lower molecular weight polyethylene having an ASTM D 1238-86 Condition E melt index of less than about 50 grams/10 minutes and an ASTM D 1238-86 Condition F melt index of at least 0.1 gram/10 minutes, (2) a large proportion of finely divided water-insoluble siliceous filler, and (3) interconnecting pores wherein the weight percent of the ultrahigh molecular weight polyethylene in the total polyethylene of the matrix and the filler/matrix weight ratio are within the polygon ABCDEF of FIG. 6 of the drawings.
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H. Ueda et al, "Characterization of Mixtures of Linear Polyethylenes of Ultrahigh and Moderate Molecular Weights", Polymer Engineering and Science, vol. 26, No. 21, Nov. 1986, pp. 1483-1488.
Keim William
Schwarz Richard A.
Le Hoa T.
Morris George D.
PPG Industries Inc.
Sluby P. C.
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