Manufacture of shear-resistant aqueous copolymer emulsions

In a process for the manufacture of shear-resistant aqueous copolymer emulsions by copolymerizing the monomers in an emulsion containing conventional polymerization initiators which form free radicals, the improvement which comprises initially copolymerizing in a reaction vessel (the amounts being based on total monomers)

• A. from 0.5 to 15 percent by weight of monomers selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, vinylsulfonnic acid, .beta.-acrylamido-.beta.-methylpropanesulfonic acid and .beta.-methacrylamido-.beta.-methylpropanesulfonic acid
• B. from 5 to 30 percent by weight of monoolefinic monomers containing a functional group selected from the group consisting of a tertiary amino group, a quaternary amino group and a heterocyclic group containing nitrogen and thereafter, while continuing the copolymerization, adding to said vessel
• C. from 0 to 94.5 percent by weight of monomers from the group of styrene and acrylonitrile and
• D. from 0 to 94.5 percent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, as well as
• E. from 0 to 30 percent by weight of further olefinic monomers and thereafter completing the polymerization, the pH during the polymerization being less than 7 and the amount of monomers (C) and (D) together being at least 25 percent by weight.

In a process for the manufacture of shear-resistant aqueous copolymer emulsions by copolymerizing the monomers in an aqueous emulsion containing conventional polymerization initiators which form free radicals, the improvement which comprises initially copolymerizing in a reaction vessel (the amounts being based on total monomers)

• A. from 0.5 to 15 percent by weight of monomers selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, vinylsulfonic acid, .beta.-acrylamido-.beta.-methylpropanesulfonic acid and .beta.-methacrylamido-.beta.-methylpropanesulfonic acid and
• B. from 5 to 30 percent by weight of monomers of the general formula ##STR7## in which R.sup.1 is a substituent selected from the group consisting of --H and --CH.sub.3, R.sup.2 and R.sup.3 are each alkyl of 1 to 4 carbon atoms, X is selected from the group consisting of --O-- and --N-- and n is a whole number from 2 to 4, and thereafter, while continuing the copolymerization, adding to said vessel
• C. from 0 to 94.5 percent by weight of monomers from the group of styrene and acrylonitrile and
• D. from 0 to 94.5 percent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, as well as
• E. from 0 to 30 percent by weight of further olefinic monomers and thereafter completing the polymerization, the pH during the polymerization being less than 7 and the amount of monomers (C) and (D) together being at least 25 percent by weight.