To provide a new polymer latex and a polish vehicle composition exhibiting improved high initial gloss and improved repeatable burnish response without giving adverse effect to durability.

A polymer composition contains an aqueous suspension or dispersion of a water-insoluble polymer of an ethylenically unsaturated monomer, wherein the polymer has a glass transition temperature of at least 35C, contains 25-65 wt.% of units of IBMA (isobutyl methacrylate) and BMA (n-butyl methacrylate), and contains 3-50 wt.% of at least one acid monomer unit.