Process of foaming polyurethanes with inorganic hydrated metal salts
Abstract
Abstract POLYURETHANE FOAMS ARE PREPARED EMPLOYING AS THE BLOWING AGENT AN INORGANIC HYDRATED METAL SALT CHARACTERIZED AS HAVING A SOLUBILITY IN ANHYDROUS ETHANOL AT 20*C. OF LESS THAN 1.2 GRAMS/100 GRAMS OF ETHANOL AND WHICH EXHIBITS A WEIGHT LOSS OF AT LEAST ABOUT 5% WHEN SUBJECTED TO A TEMPERATURE OF 115*C. FOR 30 MINUTES. THE BLOWING IS DUE TO THE STEAM DEVELOPED FROM THE REMOVAL OF A PORTION OF THE WATER OF HYDRATION AND NOT FROM CO2 AS A RESULT OF REACTION OF SUCH REMOVED WATER WITH THE ISOCYANATE. WHEN THE INORGANIC HYDRATED METAL SALT IS NOT A HYDRATED ALKALI METAL ALUMINATE, THE USE OF A HEAVY METAL CARBOXYLATE CATALYST IS ESSENTIAL TO OBTAIN FOAMING BY STEAM RATHER THAN CO2.
Inventors
- 👤 F Olstowski
Bibliographic Details
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