| abstract |
Provided is a primer composition that is excellent in barrier properties and also excellent in joint pouring properties when used for a pre-cast sealing material. The primer composition comprises (A) a film forming component comprising at least one selected from the group consisting of polyisocyanate compounds having three or more isocyanate groups, polyesters, polyester polyurethanes, epoxy compounds, and chlorinated polymers, and (B) weight The average molecular weight contains an alkoxysilyl group-containing methyl methacrylate polymer having an average molecular weight of less than 15,000. |