Transparent cover for transparent substrates
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United States of America Patent
Stats
-
May 2, 1989
Grant Date -
N/A
app pub date -
Oct 6, 1987
filing date -
Oct 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transparent cover layer of a soft elastic polyurethane for windshields or other transparent glass or plastic substrates. In order to give the cover layer an anti-fogging effect, the polyol component of the reaction mixture for the manufacture of the cover layer contains a difunctional sulfonated polyether polyol or a difunctional polyether polyol containing sulfonate groups having 0.5 to 13.2 percent by weight of OH groups and an average molecular weight of about 250 to 6500 g/mol, a trifunctional polyol having 5.1 to 12.8 percent by weight of OH groups and an average molecular weight of from 400 to about 1000 g/mol, as well as a non-ionic polyetherpolysiloxane having an average molecular weight of from 500 to 2000 g/mol.
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