Drying agents for non-foamed polyurethanes
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United States of America Patent
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May 4, 1999
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N/A
app pub date -
Apr 9, 1997
filing date -
Apr 9, 1997
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Abstract
Mild acid treatment of zeolite 3A molecular sieve to modify the pH of the surface of the molecular sieve to a pH ranging between 9.5 and 11 was found to significantly minimize the effect of the zeolite 3A on the pot life of non-foamed polyurethanes. Increases in pot life over untreated zeolite 3A molecular sieve were dramatic (about 400%) with less than 5% reduction in water adsorption capacity.
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