Patent ID: 8741985

Claim:
A sealer comprising a resin emulstion which comprises emulsion particles having an inner layer and an outer layer, wherein the inner layer is formed from a polymer (I) which is prepared by emulsion polymerization of a monomer component A comprising 85 to 100% by weight of styrene and 0 to 15% by weight of a monomer other than the styrene, and the outer layer is formed from a polymer (II) having a glass transition temperature of not more than 40° C., which is prepared by emulsion polymerization of a monomer component B comprising 6 to 25% by weight of a carboxyl group-containing monomer and 75 to 94% by weight of a monomer other than the carboxyl group-containing monomer, the weight ratio of the polymer (I) to the polymer (II) [polymer (I)/polymer (II)] is 25/75 to 75/25, and the total content of the polymer (I) and the polymer (II) in the emulsion particles is 50 to 100% by weight, and wherein the content of styrene is 70 to 85% by weight, and the content of the monomer other than the styrene is 15 to 30% by weight in the total monomer components which are used as a raw material for a polymer constituting the emulsion particles.