| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to obtain the subject foam, excellent in mechanical properties and stainless steel corrosion resistance and useful as a heat insulating covering material, etc., by carrying out a reaction using a solution containing anhydrous sodium silicate dispersed in a specific ester compound. SOLUTION: (B) A polyol and (C) water are reacted with (D) an isocyanate in the presence of (A) a solution containing (A1 ) anhydrous sodium silicate dispersed in (A2 ) an ester compound which is a phthalic acid ester or an adipic acid ester (e.g. the one having 250-530 molecular weight, concretely dibutyl phthalate, bi-n-butyl adipate, etc.) [e.g. the one at 30-80wt.% concretration of the component A1 based on the total weight of the components A1 and A2 ] The reaction is preferably carried out by using the component A1 in an amount so as to provide 1-15wt.% based on the total weight of the components A, B, C and D. |
