| 摘要 |
PROBLEM TO BE SOLVED: To obtain a primer composition enabling the dramatic extension of the allowance in time of jointing after coating in the jointing of concrete or mortar and capable of exhibiting excellent jointing performance even in the case where the groundwork is wet by compounding an amine hardener in an amount specific to an epoxy resin. SOLUTION: This primer composition is obtained by compounding (A) an epoxy resin (e.g. a bisphenol A-type epoxy resin), (B) a polyamine hardener, (C) a polysulfide polymer and (D) a tertiary amine compound, wherein the component B is 0.1-0.6 equivalent based on one equivalent of the component A. Further, it is preferable that the component B is one or more kinds selected from aliphatic polyamines, alicyclic polyamines, aromatic polyamines and modified compounds of these polyamines, and 1-60 pts.wt. and 0.1-3.0 pts.wt. of the component C and the component D, respectively are compounded based on 100 pts.wt. of the component A.
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