Electroconductive roller
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United States of America Patent
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Nov 4, 2008
Grant Date -
Sep 15, 2005
app pub date -
Mar 8, 2005
filing date -
Mar 9, 2004
priority date (Note) -
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Abstract
An electroconductive roller including an electroconductive cellular material layer, comprised of a polyurethane composition, which has an average foamed cell diameter not more than 100 .mu.m and a variation .DELTA.D of the foamed cell diameter not more than 50 .mu.m. The electroconductive roller has a hardness variation .DELTA.Hs not more than 8 degrees and a circumferential non-uniformity index R.sub.MAX/R.sub.MIN in an electric resistance thereof not more than 1.3. The electroconductive cellular material layer is made of a thermosetting one-part polyurethane composition. And the polyurethane composition is cured instantly at a temperature not less than a thermosetting critical temperature for curing thereof, after it is foamed by a mechanical foaming method.
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