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AssigneeSanyo Checmical Industries, Ltd.
InventorsTomokazu Shimizu, Tadaaki Yamazaki, Shinzo Kaida, Tsuyoshi Tomosada
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An inorganic/organic composite foam that has a foam structure obtained from a combination of a phosphoric acid compound and/or a sulfuric acid compound with a blowing agent therefor, has reduced brittleness due to a cured material of an urethane prepolymer having NCO groups, and contains a powdery boric acid compound, and a process for producing the same. The foam is not only reduced in brittleness but also improved in foam strength after combustion due to the incorporation of the powdery boric acid compound while retaining inherent foam properties and inherent low quantities of heat of combustion and smoking in combustion. It is used in exterior wall panels, heat insulating materials, sound insulating materials, fireproof covering materials, lightweight aggregates, filling materials for cavities, and the like, which are required to have fire-proofing performance.
An inorganic/organic composite foam having an inorganic foam structure obtained from at least one of a phosphoric acid compound (a1) and a sulfuric acid compound (a2) with a blowing agent (b), said foam having reduced brittleness due to a physically integrated cured material of an urethane prepolymer (c) having NCO groups, the foam also containing a powdery boric acid compound (d);
A process for producing an inorganic/organic composite foam having an inorganic structure, comprising:
An inorganic/organic composite foam having an inorganic foam structure obtained from at least one of (a1) a phosphoric-containing acid or a polyvalent metal salt thereof, and (a2) a sulfuric acid or a polyvalent metal salt thereof, combined with (b) a blowing agent for (a1) or (a2), said inorganic foam structure having been improved with respect to brittleness through a cured material formed from (c) a urethane prepolymer having NCO groups that are cured with water, and (d) a powdery boric acid compound, whereby the foam has an improved strength after combustion;
Dependencies are inferred from the claim text.