A REACTION MIXTURE FOR MANUFACTURING AN INORGANIC-FILLER BASED CLOSED-CELL RIGID POLYURETHANE OR POLYISOCYANURATE CONTAINING FOAM WITH LOW WATER CONTENT
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United States of America Patent
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Mar 27, 2025
app pub date -
Dec 21, 2022
filing date -
Dec 21, 2022
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Abstract
The present invention relates to a reaction mixture for manufacturing an inorganic-filler based closed-cell rigid polyurethane or polyisocyanurate (PU or PIR) containing foam having a calorific value below 6 MJ/kg, preferably below 4.5 MJ/kg, more preferably below 3 MJ/kg, measured according to EN ISO 1716, the reaction mixture comprising:
- At least one polyisocyanate-containing compound;At least one isocyanate-reactive compound;An inorganic filler composition;At least one physical blowing agent;characterised in that said inorganic filler composition has bulk density ranging from 1 to 2 g/cm3, preferably from 1.5 to 2 g/cm3, characterised in that said reaction mixture further comprises an added amount of water by weight lower than 1.5 parts per hundred isocyanate-reactive compounds present in the reaction mixture and wherein the total amount of inorganic fillers in the reaction mixture is at least 70 wt % calculated on the total weight of said reaction mixture, without taking into account the weight of said at least one physical blowing agent.
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