Abstract: A porous carrier for a catalyst comprising metal coated with metal oxide grains having a mean grain size of 150 nm or less and a mean pore diameter of 5.5 nm or less, is obtained by subjecting:(a) stainless steel;(b) (i) a metal alkoxide or (ii) a metal alkoxide and a metal acetate salt, both being soluble in alcohols;(c) a diol, cellosolve, or polyether which has coordinating capacity with the (i) metal alkoxide or (ii) metal alkoxide and metal acetate salt and which is soluble in alcohols; and(d) an alcohol solvent to hydrolysis and polycondensation, whereby the stainless steel is coated with an oxygen-containing organic metal compound and, subsequently, heat-treated to form a metal oxide. A method of preparing the catalyst is also provided.

Abstract: A remover solution for photoresist comprising (a) a solvent which is typically water, (b) an inorganic or organic alkaline compound such as sodium and potassium hydroxides, and (c) a borohydride compound such as sodium and lithium borohydrides and organic amine borane compounds. When used for removing patterned photoresist layer in the manufacturing process of, for example, electronic circuit board substrates. The method gives quite satisfactory results without discoloration or denaturation of the copper surface and solder surface, consequently leading to the production of high-quality products.