Sponge sheet
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United States of America Patent
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-
May 28, 2002
Grant Date -
N/A
app pub date -
Oct 12, 1999
filing date -
Feb 21, 1997
priority date (Note) -
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Abstract
A polyvinyl acetal sponge sheet of a porous structure having fine continuous pores and a film on the surface thereof. This sponge sheet can be used for a wiping material for car washing which does not leave unwiped portions during wiping after car washing and has a small frictional resistance and a high working factor.
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