Relationship Between Stress, Interaction and the Mechanical Properties of Some Pigmented Tablet Coating Films

Abstract

The mechanical properties of pigmented free films of hydroxypropyl methylcellulose in combination with either polyvinyl alcohol or polyethylene glycol 1000 and cast from aqueous systems, were measured using a stress-strain method. The pigments incorporated were two types of talc (differing in average particle size) and two types of titanium dioxide (one of which was surface-treated). Specific surface area data for the pigments and the pH of the aqueous solution or suspension of the film components were determined in order to understand the factors affecting the mechanical properties of pigmented films.