Stable dispersions of polyhydrazodicarbonamides useful in the preparation of polyurethane products having improved load-bearing capacity
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United States of America Patent
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Aug 30, 1994
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N/A
app pub date -
Jan 23, 1990
filing date -
Jan 23, 1990
priority date (Note) -
Expired
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Abstract
This invention relates to a process for the preparation of stable dispersions of hydroxyl-containing polyhydrazodicarbonamides in a hydroxyl-containing compound. The dispersions are prepared by the reaction of organic isocyanates, isocyanate-reactive compounds having a molecular weight in the range from 400 to 10,000, relatively low molecular weight isocyanate-reactive compounds, and hydrazines or hydrazides. This invention further relates to the dispersions prepared by said process, the use of the dispersions to prepare polyurethane foams having exceptional hardness, and the foams prepared thereby.
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