Abstract
To impart durable‐press properties to cellulosic material, the fabrics have been treated with a finishing bath containing a polycarboxylic acid in combination with an appropriate catalyst. When citric acid (CA) was applied as crosslinking agent discoloration of the fabric was observed. Special additives were included into the formulation to improve the whiteness index. Isocratic HPLC was used to identify and quantify the unsaturated polycarboxylic acids that are produced during the curing process of CA‐treated cotton fabrics. The influence of different catalysts (sodium hypophosphite, sodium dihydrogen phosphate, disodium hydrogen phosphate, tetrasodium pyrophosphate, trisodium phosphate) and of various types of additives, such as triethanol amine (TEA), W,/V,bis(hydroxy‐ethyljglycine (BICINE), boric acid and polyethylene glycol 200 (PEG 200), on the content of CA and the amount of unsaturated PCAs in the wash liquor and on the fabric has been investigated. A significant reduction of the unsaturated polycarboxylic acids was observed when an additive was incorporated into the pad bath.
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