The present invention relates to a copolymer, and a slurry composition, a separator, and a secondary battery that comprise same, wherein the copolymer comprises, based on 100 wt % of the total weight of the copolymer, 15 wt % or less of a vinylacetate monomer unit, 10-55 wt % of an acrylate-based monomer unit, and 1-10 wt % of an acrylic acid-based monomer unit bound with at least one selected from the group consisting of an alkali metal and an acetate salt compound comprising an alkali metal.