Lead amidosulphonate

Alkyl phenol ethoxylates have been over many years the workhorses as nonionic emulsifiers for emulsion polymerization. Depending on availability and price of buten and propen, nonyl (tripropylene)phenol ethoxylates or octyl (dibutylene) phenol ethoxylates have been very broadly used, whereas dodecyl (tetrapropylene or tributylene)phenol and tri tert-butylphenol ethoxylates were merely regarded as specialties. These aUcyl phenol ethoxylates can also be used as intermediates for the synthesis of anionic alkyl phenol ether sulphates. Sulphation by chlorosul-phonic acid or sulphur trioxide besides formation of the ether sulphate end group inevitably leads to certain amounts of ring sulphonation in the phenyl group, whereas amidosulphonic acid gives sulphonate-free aUcyl phenol ether sulphate ammonium salts. 

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