Process for rigid polyurethane foams
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United States of America Patent
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Jan 15, 2002
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app pub date -
Jun 10, 1997
filing date -
Jun 20, 1996
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Abstract
Process for the preparation of a rigid polyurethane or urethane-modified polyisocyanurate foam in the presence of a hydrocarbon blowing agent using a tolylenediamine-initiated polyether polyol in an amount of between 10 and 40% by weight based on total isocyanate-reactive compounds.
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