FWAs, Uses

Synthetic Fiber and Plastics Industries. In the synthetic fibers and plastics industries, the substrate itself serves as the solvent, and the whitener is not appHed from solutions as in textiles. Table 6 Hsts the types of FWAs used in the synthetic fibers and plastic industries. In the case of synthetic fibers, such as polyamide and polyester produced by the melt-spinning process, FWAs can be added at the start or during the course of polymerization or polycondensation. However, FWAs can also be powdered onto the polymer chips prior to spinning. The above types of appHcation place severe thermal and chemical demands on FWAs. They must not interfere with the polymerization reaction and must remain stable under spinning conditions. 

J. Schulze, T. Polcaro, P. Stensby Analysis of FWA in US Home Laundry Detergents , Soap Cosmet. Chem. Spec. 50 (1974) no. 11, 46-52. H. Bloching, W. Holt-mann, M. Otten Beitrag zur Analytik von Weisstonem in Waschmittcln , Seij en OeleFette Wachse 105 (1979) no. 2, 33-38. 

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