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US 4,216,190 AGranted
Method for making .beta.-form aluminum trimetaphosphate
AssigneePPG Industries, Inc.
InventorJames E. Neely, Jr.
Life of this patent
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Abstract
A method is disclosed for making the .beta.-form of aluminum trimetaphosphate by reacting aluminum dihydrogen phosphate with ammonia and subjecting the reaction product to a single elevated temperature treatment.
Claims7
A method for preparing aluminum trimetaphosphate in the B-form comprising the steps of:
- a. reacting aluminum dihydrogen phosphate with ammonia to form a reaction product;
- and
- b. heating the reaction product to a sufficient temperature for a sufficient time that the crystal structure of the heat-treated reaction product is predominantly the B-form.
Dependencies are inferred from the claim text.