What are the uses of ethyl phthalate
German Wiki article contains more use-cases for ethyl phthalate:


Formulation auxiliaries for plant protection products
Fixer for fragrances; 
In the process of ethanol denaturing (in cosmetics this product is denoted as Alcohol denat.);
In manufacturing of cellulose esters as a very well-gelling and light-resistant plasticizer;
A plasticizer for cellulose-based varnish binders and as enteric coating for medicaments;
A part of cosmetic products due to its film-forming, softening and hair-conditioning properties;
Explosives phlegmatizer;
A carrier in the dyeing process of cellulose acetate or triacetate fibers.