Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By treating occluded solids
Reexamination Certificate
2004-12-07
2008-11-04
Heitbrink, Jill L (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By treating occluded solids
C264S288800, C264S344000
Reexamination Certificate
active
07445735
ABSTRACT:
A method for producing a microporous material comprising the steps of: providing an ultrahigh molecular weight polyethylene (UHMWPE); providing a filler; providing a processing plasticizer; adding the filler to the UHMWPE in a mixture being in the range of from about 1:9 to about 15:1 filler to UHMWPE by weight; adding the processing plasticizer to the mixture; extruding the mixture to form a sheet from the mixture; calendering the sheet; extracting the processing plasticizer from the sheet to produce a matrix comprising UHMWPE and the filler distributed throughout the matrix; stretching the microporous material in at least one direction to a stretch ratio of at least about 1.5 to produce a stretched microporous matrix; and subsequently calendering the stretched microporous matrix to produce a microporous material which exhibits improved physical and dimensional stability properties over the stretched microporous matrix.
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Demeuse Mark T.
Miller Eric H.
Whear J. Kevin
Yaritz Joseph G.
Daramic LLC
Hammer & Associates, P.C.
Heitbrink Jill L
LandOfFree
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