Method for forming a gellified polyurethane layer on a surface
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Jul 8, 1988
filing date -
Jul 16, 1987
priority date (Note) -
Expired
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Abstract
Method and device for forming a gellified polyrethane layer on a surface, notably of a mould, by spraying a liquid reaction mixture comprising polyol and isocyanates and which has a viscosity between 20 and 2000 centipoises. The mixture is sprayed in the form of a film of liquid and/or raindrops of which the main part has a mean diameter (Medium Volume Diameter; 'M.V.D.') which, according to the standards ASTM E 779-81, is larger than 100 microns and preferably larger than 500 microns.
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