| 摘要 |
Provided is a water-based primer composition exhibiting excellent adhesiveness with regard to an adherend such as mortar. This water-based primer composition contains a high molecular-weight emulsion (A) which is an emulsion of a resin having a weight average molecular weight of 200,000 or more, and a low molecular-weight emulsion (B) which is an emulsion of a resin having a weight average molecular weight of 100,000 or less, wherein the average particle size of the resin of the low molecular-weight emulsion (B) is 0.6 μm or smaller. |
