| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hardening composition having excellent compatibility, and capable of forming a highly hard coating membrane having excellent acid resistance and abrasion resistance at the same time by formulating a specific self-curing resin and an inorganic oxide colloid dispersion. SOLUTION: This composition contains (A) a self-curing resin having carboxyl groups and epoxy groups in one molecule and (B) an inorganic oxide colloid dispersion. Further, it is preferable that the component A has an acid value of 30-110 mgKOH/g, an epoxy content of 0.5-2.5 mmol/g, a number average molecular weight of 1,000-30,000, an equivalent ratio of the acid/epoxy of the component A of 0.7-1.3 and a compatibility parameter of 9.0-11.0. The component A is preferably obtained, for example, by copolymerizing an epoxy group- containing monomer and a carboxylic group-containing monomer such as (meth) acrylic acid, maleic acid, itaconic acid, fumaric acid or mesaconic acid as essential components at a low temperature.
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