Acicular, crystalline calcium metaphosphate, a method for its production, and composites of organic polymeric material containing it

摘要

Acicular, crystalline calcium metaphosphate having a length to average diameter ratio of at least 10:1 can be prepared by forming a melt of materials used as a source of calcium, phosphorus and alkali metal, usually at about 1000to 1200°C., cooling the melt to within the range about 550°C. to about 970°c., inducing acicular crystal formation, and recovering the acicular crystals. The diameters of the resultant acicular, crystalline calcium metaphosphates can vary from an average of 0.5 micron or smaller up to several microns. Cryst- afs having a length of several centimeters can be prepared. Such acicular, crystalline calcium metaphosphates are useful in a number of applications, and particularly to prepare composites with organic polymeric materials.