Secondary aliphatic diamines as curing agents for polyurethanes and polyureas prepared using high-pressure impingement mixing
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United States of America Patent
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Jun 11, 2002
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N/A
app pub date -
Jul 17, 2000
filing date -
Jul 17, 2000
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Abstract
Certain secondary aliphatic diamines are excellent chain extenders in the formation of polyurethanes, polyurea-polyurethane hybrids, and polyurea polymers, both elastomers and coatings, from both monomeric polyisocyanates and isocyanate-terminated prepolymers using the high-pressure impingement mixing reaction technique. These diamines include 1,4-di(alkylamino)cyclohexanes, 1-methyl-2,4-di(alkylamino)-3,5-dialkylcyclohexanes, N,N'-dialkyl isophoronediamine, 1,3-di(1'methyl-1'-alkylaminoethyl)benzene, and 1,6-di(alkylamino)hexane. These chain extenders may be used alone or in combination with other polyamines and with polyols. A broad spectrum of polymeric materials can be formed with a range of diverse properties.
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