Drying agents for non-foamed polyurethanes
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United States of America Patent
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Apr 18, 2000
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app pub date -
Nov 24, 1998
filing date -
Apr 9, 1997
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Abstract
Mild acid treatment of potassium 3A zeolite molecular sieve to modify the pH of the surface of the molecular sieve to a pH ranging between 9.6 and 11 was found to significantly minimize the effect of the potassium 3A zeolite on the pot life when used as a drying agent for non-foamed polyurethanes. Increases in pot life in non-foamed polyurethane preparations over similar preparations with untreated potassium 3A zeolite molecular sieve were dramatic (about 400%) with less than 5% reduction in water adsorption capacity.
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