| 摘要 |
PROBLEM TO BE SOLVED: To provide a powder coating composition that can simply and inexpensively form coating film having excellent machining performance, water-resisting properties, corrosion resisting performance and temperature gradient resistance. SOLUTION: This powder coating composition comprises, as the main components for the powder coating composition, an epoxy resin consisting of 20-100 wt.% of an epoxy resin having an epoxy equivalent of 500-2,000 g/eq in the tetramethylbiphenyl skeleton, a terpene-novolak glycidyl ether resin of 500-2,000 g/eq epoxy equivalent or the sum of both the epoxy resins and 0-80 wt.% of an epoxy resin having an epoxy equivalent of 500-2,000 g/eq in the diphenylalkane skeleton, and a phenol-curing agent having 100-500 g/eq of the phenolic hydroxy group, so that the equivalent ratio of the phenolic hydroxy group of the phenol curing agent to the glycidyl groups of this epoxy groups may satisfy 0.7-1.3.
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