2180154-A is referenced by 5 patents.
Propionic acid derivative drug particles are coated with an inner coating of an enteric material and an outer coating of a material which is insoluble in the stomach and intestines and acts as a diffusion barrier for the drug active. The enteric material is an acrylic polymer or copolymer e.g. Eudragit L 30D and the outer coating is a methacrylic acid polymer or copolymer e.g. Eudragit E 30D, RL or RS. The drug may be ibuprofen, fluprofen, ketoprofen etc. The particles can be processed into tablets or encapsulated.