Patent ID: 6228430
Filing Date: 2001-05-08
Classification: C04B,C09D

Abstract:
A surface treatment agent comprising:an adhesive polymeric water emulsion applied onto a surface of a base member to provide a film of said adhesive polymeric water emulsion, said adhesive polymeric water emulsion containing either one of or both of hydroxyl groups (--OH) and carboxyl groups (--COOH);a silica-based granular material comprised of silicon oxide (SiO.sub.2) and supported by said adhesive polymeric water emulsion wherein at least a part of said adhesive polymeric water emulsion is covered by said silica-based granular material;a liquid base treatment agent containing a silica-based powder or granular material comprised of silicon oxide (SiO.sub.2), a calcium-containing substance containing either one of or both of calcium hydroxide (Ca(OH).sub.2) and calcium oxide (CaO), water (H.sub.2 O), and either one of or both of an organic acid and an organic acid salt having an acid dissociation exponent (pKa) ranging from 3 to 5 to provide an aqueous alkali silicate solution, said base treatment agent applied onto a surface of a coating film of said adhesive polymeric water emulsion to provide a film wherein said silica-based granular material is covered by said base treatment agent; anda liquid base reinforcing agent applied onto a surface of a coating film of said base treatment agent on said polymeric water emulsion to provide a film, said base reinforcing agent containing an aqueous solution of alkali silicate, and either one of or both of an organic acid and an organic acid salt having an acid dissociation exponent (pKa) ranging from 3 to 5.