Water-based primer composition
The present invention is to provide a water-based primer composition that exhibits excellent adhesion toward 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 higher, and a low molecular weight emulsion (B) which is an emulsion of a resin having a weight average molecular weight of 100,000 or lower, wherein an average particle diameter of the resin of the low molecular weight emulsion (B) is 0.6 μm or less.
1. A water-based primer composition comprising: a high molecular weight emulsion (A) which is an emulsion of a resin having a weight average molecular weight of 200,000 or higher; and a low molecular weight emulsion (B) which is an emulsion of a resin having a weight average molecular weight of 100,000 or lower; wherein an average particle diameter of the resin of the low molecular weight emulsion (B) is 0.6 μm or less
wherein the resin of the low molecular weight emulsion (B) is an acrylic emulsion obtained by copolymerizing monomers containing from 15 to 25 mol % of a polymerizable monomer having an ionic functional group.
2. The water-based primer composition according to claim 1 , wherein the ionic functional group is at least one selected from the group consisting of a hydroxy group, a carboxy group, and an alkoxysilyl group.
3. The water-based primer composition according to claim 2 , wherein the alkoxysilyl group is at least one selected from the group consisting of a diethoxysilyl group, a triethoxysilyl group, a dipropoxysilyl group, and a tripropoxysilyl group.
4. The water-based primer composition according to claim 1 , wherein the high molecular weight emulsion (A) is at least one selected from the group consisting of an acrylic emulsion, a polyolefin emulsion, an ethylene vinyl acetate emulsion, and a urethane emulsion.
5. The water-based primer composition according to claim 1 , wherein the water-based primer composition is a water-based primer composition for a sealing material.