. "xample, polyethylene glycols, cellulose and cellulose derivatives such as methylcellulose, hydroxypropylmethylcellulose and ethylcellulose, polyvinyl alcohol, proteins such as gelatin, salts such as alkali and alkaline earth metal sulfates, alkali and alkaline earth metal chlorides and alkali or alkaline earth metal carbonates, for example sodium sulfate, magnesium sulfate, calcium sulfate, sodium" . . . . . .