Plasticizer free caulks and sealants having improved aged wet adhesion

An aqueous caulk or sealant composition that is substantially free of any plasticizer comprising:

• (i) an aqueous binder of one or more copolymer chosen from:
• a mixed backbone acid copolymer copolymerized from methacrylic acid (MAA) and a second acid monomer having a lower pKa than methacrylic acid and chosen from a monocarboxylic acid, dicarboxylic acid, phosphorus acid, sulfur acid, and mixtures thereof, the MAA and the second acid monomer being copolymerized in the amount of from 0.1 to 5.0 wt. %, based on total copolymerized monomer weight;
• a copolymer having a mixture of backbone acid and hydroxyl groups copolymerized from 0.5 to 7.5 wt. %, based on total copolymerized monomer weight, of the one or more hydroxyl group containing monomer and from 1.0 to 5.0 wt. %, based on total copolymerized monomer weight, of one or more acidic monomer chosen from MAA and the second acid monomer;
• and copolymer mixtures thereof,
• wherein the copolymer has a glass transition temperature (Tg) of −25° C. or less, wherein the aqueous binder is copolymerized from no more than one second acid monomer chosen from phosphorus acid and sulfur acid;
• and,
• further wherein, the aqueous binder copolymer has a solids content of 50 wt. % or higher, based on the total weight of the aqueous binder copolymer;
• (ii) one or more filler in a filler to binder ratio of 0.25:1 or higher, or up to 4:1;
• and,
• (iii) water.