STANNOUS CHLORIDE COMPOSITION FLOWABLE AT AMBIENT CONDITIONS
A stannous chloride composition and method of making a composition that is flowable at ambient conditions and is substantially free of an anti-caking agent. The composition includes anhydrous stannous chloride, stannous chloride hydrate, and water in an amount of about 1 to about 10 weight percent based on a total weight of the composition. The anhydrous stannous chloride and the stannous chloride hydrate are present in a weight ratio of about 5:95 to about 81:19, respectively, and the composition has a dump angle of from about 20 to about 80 degrees.
1 . A stannous chloride composition comprising:
a) anhydrous stannous chloride;
b) stannous chloride hydrate; and
c) water present in an amount of about 1 to about 10 weight percent based on a total weight of the stannous chloride composition,
wherein the stannous chloride composition is flowable at ambient conditions and contains less than about 5 wt. % of an anti-caking agent,
wherein the anhydrous stannous chloride and the stannous chloride hydrate are present in a weight ratio of about 5:95 to about 81:19, respectively, and
wherein the stannous chloride composition has a dump angle of from about 20 to about 80 degrees.
2 . The stannous chloride composition of claim 1 , wherein the composition is non-hygroscopic and absorbs less than 0.2 wt % of water when exposed to the atmosphere at about 25° C. and at a relative humidity of about 40% for about 20 hours.
3 . The stannous chloride composition of claim 1 , wherein the water is present in an amount of about 2 to about 8 weight percent based on a total weight of the stannous chloride composition.
4 . The stannous chloride composition of claim 1 , wherein the water is present in an amount of about 4 to about 8 weight percent based on a total weight of the stannous chloride composition.
5 . The stannous chloride composition of claim 1 , wherein the anhydrous stannous chloride and the stannous chloride hydrate are present in a weight ratio of about 30:70, respectively.
6 . The stannous chloride composition of claim 1 , having a dump angle of from about 35 to about 65 degrees.
7 . The stannous chloride composition of claim 1 , wherein the stannous chloride hydrate comprises stannous chloride dihydrate and distannous tetrachloride tri-hydrate.
8 . The stannous chloride composition of claim 1 , wherein the anti-caking agent is silica.
9 . The stannous chloride composition of claim 1 , further comprising a toothpaste.
10 . A method of forming a stannous chloride composition comprising the steps of:
a. providing the stannous chloride hydrate; and
b. drying the stannous chloride hydrate under vacuum to a water content of from about 1 to about 10 weight percent thereby forming anhydrous stannous chloride and the stannous chloride composition;
wherein the composition is flowable at ambient conditions, contains less than about 5 wt. % of an anti-caking agent, and comprises anhydrous stannous chloride, stannous chloride hydrate, and water present in an amount of about 1 to about 10 weight percent based on a total weight of the composition,
wherein the anhydrous stannous chloride and the stannous chloride hydrate are present in a weight ratio of about 5:95 to about 81:19, respectively, and
wherein the composition has a dump angle of from about 20 to about 80 degrees, the method.
11 . The method of claim 10 , wherein the stannous chloride composition is non-hygroscopic and absorbs less than 0.2 wt % of water when exposed to the atmosphere at about 25° C. and at a relative humidity of about 40% for about 20 hours.
12 . The method of claim 10 , wherein the water is present in the stannous chloride composition in an amount of about 2 to about 8 weight percent based on a total weight of the stannous chloride composition.
13 . The method of claim 12 , wherein the water is present in the stannous chloride composition in an amount of about 4 to about 8 weight percent based on a total weight of the stannous chloride composition.
14 . The method of claim 10 , wherein the step of drying is further defined as drying the stannous chloride hydrate at a temperature of about 80° C. to a water content of from about 1 to about 10 weight percent.
15 . The method of claim 10 , wherein the anhydrous stannous chloride and the stannous chloride hydrate are present in the stannous chloride composition in a weight ratio of about 30:70, respectively.
16 . The method of claim 10 , wherein the stannous chloride hydrate comprises stannous chloride dihydrate and distannous tetrachloride tri-hydrate.
17 . The method of claim 10 , wherein the anti-caking agent is silica.