ALUMINA

摘要

The specification describes a method of producing ground alpha alumina trihydrate such that it is suitable for incorporation in a toothpaste. The method includes the steps of grinding the substance to a mean particle diameter of less than 25 microns in the presence of a sufficient quantity of a potable organic acid or acid reacting salt to convert all free caustic soda on the surface of the particle to a sodium salt. Such a method reduces the possibility of the combined particles and toothpaste corroding the aluminum tubes used to package the product.