exchange resin application_number US 285079 A description according to the process of the invention the chloromethylation may be described as follows the quantity of metallic chloride is such that a sulfuric acid chloromethyl methyl ether molar ratio at least equal to 0 4 is obtained in the chloromethylating complex this ratio may range from about 0 4 to about 1 0 if the ratio is less than about 0 4 the catalytic activity due to sulfuric acid becomes negligible and the quantity of water produced in the second reaction becomes too large the following examples are given to illustrate the invention and are not to be considered restrictive examples 1 and 2 are comparative and illustrate the previous techniques chloromethylation using chloromethyl methyl ether is described about 100 g of styrene divinylbenzene copolymer 5 divinylbenzene is chlormethylated with a mixture containing 220 ml chloromethyl methyl ether 100 ml methylene chloride and 51 g of zinc chloride at 40 u00b0 c for eight hours the crosslinked polystyrene based beads are drained and washed with methyl alcohol a strong base anion exchange resin is produced by amination of the chloromethylated beads as follows to 100 g of beads is added 100 ml of water then 72 g of trimethylamine in aqueous solution at 250 g l is added over three hours while maintaining the temperature from.