Process for preparing smoke-retardant polyisocyanurate foam
AssigneeMitsubishi Chemical Industries Limited
InventorsKaneyoshi Ashida, Masaaki Ohtani, Shoichi Ohkubo
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Abstract
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement is characterized in that the reaction is conducted in the presence of an organosilicate having the formula Si(OR).sub.4 or R.sub.n Si(OR').sub.4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1-12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
Claims13
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement characterized in that the reaction is conducted in the presence of from 0.7 to 1.5 wt. %, as Si, of an organosilicate having the formula Si(OR).sub.4 or R.sub.n Si(OR').sub.4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
A polyisocyanurate foam which contains an organosilicate having the formula Si(OR).sub.4 or R.sub.n Si(OR').sub.4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1-3, in an amount of 0.7-1.5 wt.% as Si derived from the organosilicate relative to the weight of the foam.
Dependencies are inferred from the claim text.