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US 4,288,252 AGranted
Method of making low temperature curable silicate compositions
AssigneePPG Industries, Inc.
InventorJames E. Neely
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Abstract
A method is disclosed for making low temperature curable silicate compositions by combining a mixture of sodium and potassium silicates with the B-form of aluminum trimetaphosphate.
Claims4
A method for making a waterstable composition from an aqueous silicate solution comprising a water soluble silicate and an inorganic curing agent which comprises the steps of:
- a. reacting an ammonia compound with aluminum dihydrogen phosphate to form a reaction product;
- b. heating said reaction product at a sufficient temperature for a sufficient time to produce predominantly B-form aluminum trimetaphosphate;
- c. combining said heated reaction product with a mixture of alkali metal silicates;
- and
- d. curing at a temperature between 150.degree. C. and 250.degree. C. until the composition is water stable.
2 more elements
Dependencies are inferred from the claim text.