HYDROPHOBIC CARBOMER COMPLEX COMPOSITIONS

摘要

Hydrophilic carbomer complexes, such as bismuth or nicotine carbomer, are rendered hydrophobic at neutral to acid pH by milling to pass a 150 mu m sieve screen and then impregnating with a water-insoluble anionic polymer. Preferred anionic polymers are partly methyl esterified methacrylic acid polymers.