Water repellent inorganic foam and method for producing the same
AssigneeAsahi-Dow Limited
InventorsAkira Yoshino, Isamu Iwami, Tsuneo Wakabayashi
Life of this patent
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Abstract
A water repellent inorganic foam is prepared by foaming and setting a foamable composition comprising an aqueous metal phosphate in the presence of a specific compound having hydrophobic groups and functional groups reactive with said metal phosphate.
Claims17
In an inorganic foamed article comprising a metallic salt of phosphoric acid, the improvement which comprises imparting water repellency to said article by chemically bonding hydrophobic groups to said salt, said hydrophobic groups being formed during preparation of the article by a reaction between said salt and a compound of the formula (I):
- ##STR15## wherein Q represents phosphorus or nitrogen and k, l, m and n are integers of 0 or 1 and, when Q is phosphorus,
- (1) k is 0 or 1, l and m are 1, n is 0 or 1, R and R' are hydrogen atoms, and R" is an alkyl, an aryl, a substituted alkyl or a substituted aryl;
- or
- (2) k is 0 or 1, l is 1, m and n are each 0 or 1, R is hydrogen and R' and R" are each an alkyl, an aryl, a substituted alkyl or a substituted aryl, and
- when Q is nitrogen, k, l, m and n are 0, R, R' and R" are each hydrogen, an alkyl, an aryl, a substituted alkyl or a substituted aryl, with the proviso that the case where R, R' and R" are all hydrogen is excluded.
A process for producing a water repellent inorganic foam which comprises foaming a foamable composition comprising metallic salts of phosphoric acid in the presence of a compound of the formula (I):
- ##STR16## (wherein Q represents phosphorus or nitrogen and k, l, m and n integers of 0 or 1 and, when Q is phosphorus,
- (1) k is 0 or 1, l and m are 1, n is 0 or 1, R and R' are each hydrogen and R" is an alkyl, an aryl, a substituted alkyl or a substituted aryl;
- or
- (2) k is 0 or 1, l is 1, m and n are each 0 or 1, R is hydrogen and R' and R" are each an alkyl, an aryl, a substituted alkyl or a substituted aryl, and when Q is nitrogen, k, l, m and n are 0, R, R' and R" are each hydrogen, and alkyl, an aryl, a substituted alkyl or a substituted aryl, with proviso that the case where R, R' and R" are all hydrogens is excluded) in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the metallic salts of phosphoric acid.
Dependencies are inferred from the claim text.