Polyurethane foams based on amino polyols
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United States of America Patent
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Mar 31, 1987
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N/A
app pub date -
Oct 24, 1985
filing date -
Oct 24, 1985
priority date (Note) -
Expired
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Abstract
An improved method for preparing amino polyols is disclosed. The method is the Mannich condensation of phenol, formaldehyde and diethanolamine in a molar ratio of (1:1:1), and then alkoxylation with a mixture of ethylene oxide and propylene oxide in a weight ratio of about 5:95 to 20:80 to form an amino polyol of hydroxyl number 440 to 515. The method gives higher yields of aromatic amino polyols of lower viscosity than those of the comparative example.
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