Adhesive composition for dermal patch and production process thereof

A process for producing an adhesive composition for dermal patch, the adhesive composition comprising, as essential components, (A) a (meth)acrylic acid-base polymer having repeating units represented by formulae (1) and (2):

• wherein R1 and R2 each independently represents a hydrogen atom or a methyl group and M represents NH4+ or an alkali metal, with a ratio of (1)/(2) being in a range from 100/0 to 90/10 (by mol), (B) water, (C) a polyhydric alcohol and (D) an aluminum compound and comprising, if desired, (E) a polymer compound having high affinity for the polyhydric alcohol, with the content of (B) water being from 5 to 30 mass % above,
• wherein the process comprises mixing (A) the (meth)acrylic acid-base polymer and a solution of (C) the polyhydric alcohol in (B) water to give a water concentration of 50% or more in the total mass thereof, and then adding and mixing the remaining ingredients (C) the residual polyhydric alcohol, (D) the aluminum compound and if desired, (E) the polymer compound to adjust the water concentration to a range of 5 to 30%.