Zinc borate
AssigneeU.S. Borax Inc.
InventorDavid M. Schubert
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Abstract
Zinc borate compositions having a ZnO:B.sub.2 O.sub.3 ratio of 4:1. The hydrated zinc borate 4ZnO.B.sub.2 O.sub.3.H.sub.2 O and anhydrous zinc borate 4ZnO.B.sub.2 O.sub.3 are especially useful as fire-retardants and smoke-suppressant additives for polymeric compositions.
Claims14
The method of producing a crystalline zinc borate of the formula 3.9-4.1(ZnO).0.9-1.1(B.sub.2 O.sub.3).0.8-1.2(H.sub.2 O) which comprises reacting zinc oxide with a stoichiometric amount of boric acid or salt thereof in an aqueous solution at an elevated temperature about the boiling point of the mixture, thereby forming said crystalline zinc borate, and separating said crystalline zinc borate from said aqueous solution.
The method of producing a crystalline zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O which comprises heating an aqueous slurry of less than about 5% concentration of zinc borate 2ZnO.3B.sub.2 O.sub.3.3.5H.sub.2 O at reflux temperature for a period of time sufficient to form said crystalline zinc borate 4ZnO.B.sub.2 O.sub.3.H.sub.2 O.
The method of producing zinc borate of the formula 4ZnO.B.sub.2 O.sub.3 which comprises heating hydrated zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O at a temperature above 415.degree. C. for a period of time sufficient to remove essentially all water.
A smoke-suppressant polymer composition comprising an organic polymer and a zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O.
A polymeric coating composition comprising an organic polymer and an anti-corrosive amount of zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O.
The method of producing a polymer composition having 12 reduced smoke-generating properties upon burning which comprises incorporating a smoke-suppressant amount of a zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O in said polymer.
The method of producing a polymeric coating composition having reduced corrosiveness, which comprises incorporating an anti-corrosive amount of a zinc borate of the formula 4ZnO.B.sub.2 O.sub.3.H.sub.2 O into said polymer coating composition.
Dependencies are inferred from the claim text.