Acicular, crystalline calcium metaphosphate

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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423306, 423314, C01B 2530

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active

043606253

ABSTRACT:
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, cooling the melt to about 550.degree. C. to about 970.degree. C., inducing acicular crystal formation, and recovering the acicular crystals. The diameters of the resultant acicular, crystalline calcium metaphosphates can average as small as 0.5 micron or smaller. Acicular, crystalline calcium metaphosphate can also be prepared with an average diameter of several microns and a length of several centimeters. Such acicular, crystalline calcium metaphosphates are useful in a number of applications, and particularly to prepare composites with organic polymeric materials.

REFERENCES:
patent: 2233401 (1941-03-01), Copson
patent: 2280848 (1942-04-01), Pole
patent: 3031263 (1962-04-01), Sefton et al.
patent: 3378340 (1968-04-01), Martin et al.
patent: 4239523 (1980-12-01), Spada
Kirk-Othmer, Encyclopedia of Chemical Technology, Second Edition, (1968), pp. 248-250.

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