CALCIUM HYDROGEN PHOSPHATE, A METHOD FOR PREPARING IT, AND AN EXCIPIENT UTILIZING IT

摘要

The object of the present invention is to prepare a calcium hydrogen phospha te that has excellent binding properties, a large oil adsorption capacity and a specific surface area, and is therefore suitable as an excipient. A scale-like calcium hydrogen phosphate is prepared by reacting phosphoric acid with an alkaline calcium compound such as quick lime, in the presence of a multivale nt organic acid with coordinating ability, such as citric acid, to obtain a columnar calcium hydrogen phosphate, and then hydrothermally treating the obtained columnar calcium hydrogen phosphate at a temperature of 60.degree. C or higher.