Patent ID: 6358531
Filing Date: 2002-03-19
Classification: A61K,C03C,Y10S

Abstract:
A method for preparing a shell or porous gel from glass particles which comprises the steps of:(a) forming particles of an alkali borate glass composition containing one or more cations which react with an aqueous solution containing an anion reactive with said cation to form an aqueous insoluble material having a solubility limit of less than about 0.01 wt. %; (b) immersing said glass composition particles in said aqueous solution to cause reaction of said particles to form said insoluble material which is essentially the same size as the as-made particles with the alkali and boron dissolving from the glass particles; and (c) allowing said reaction to continue until said alkali and boron are substantially completely dissolved from said glass particles and the resulting product is composed of a shell filled with colloidal particles or gel, concentric shells or a porous, homogenous gel, said product being nonradioactive and not adapted for neutron irradiation.