Method for making redispersible synthetic resin powders

A method for making a redispersible synthetic resin powder which comprises spray drying an aqueous dispersion of a synthetic resin, said dispersion having a minimum film forming temperature below 60.degree. C. and containing a dispersed copolymer having a dynamic glass transition temperature below 150.degree. C. and comprising from 20 to 60 percent by weight of at least one member selected from the group consisting of acrylic acid and methacrylic acid, from 40 to 80 percent by weight of at least one member selected from the group consisting of esters of acrylic acid with an alkanol having 1 to 8 carbon atoms, esters of methacrylic acid with an alkanol having 1 to 8 carbon atoms, and mixtures of such esters with styrene, and from 0 to 10 percent by weight of at least one further unsaturated comonomer free-radically copolymerizable therewith, at an inlet temperature below the dynamic glass transition temperature of said copolymer but higher than the minimum film forming temperature of said dispersion and at an outlet temperature below 65.degree. C. but above said minimum film forming temperature.