Vinylidene chloride emulsion interpolymer composition

A latex composition capable of forming stable films which have excellent protective properties, good chemical resistance, and/or permeability to gases and water vapor, comprising particles suspended in an aqueous solution, said particles comprising an interpolymer of

• a) an acrylic latex seed particle, and
• b) vinylidene chloride polymer comprising
• i) vinylidene chloride,
• ii) one or more alkyl acrylates having from 1 to 18 carbon atoms in the alkyl group and/or one or more alkyl methacrylates having 1 to 18 carbon atoms in the alkyl group,
• iii) one ore more aliphatic alpha-beta-unsaturated carboxylic acids, and
• iv) a copolymerizable surface active agent, which is an ethylenically unsaturated sulfonate,
• the proportion of vinylidene chloride being 65 to 90 parts by weight, the portion of said alkyl acrylates and/or methacrylates being from 2 to 30 parts by weight, the portion of said carboxylic acids being from 0.1 to 10 parts by weight, and the portion of said copolymerizable surface active agent being from 0.1 to 5.0 parts by weight, all based upon parts per hundred weight of monomer.