abstract |
(A) a polymer compound containing at least one of a hydrolyzable polymer compound and a thermally decomposable polymer compound; and (B) a phosphoric acid compound, a sulfuric acid compound, a sulfonic acid compound, and a perchloric acid compound. A solution containing an oxoacid compound containing at least one of the above and (C) a laminate of layered substances is prepared, and the solution is irradiated with at least one of sound waves and radio waves, or the solution is heated. To do. |