Method of shaker molding and composition therefor
OwnerAllen A. Greenberginventor
Life of this patent
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Abstract
An improved molding powder which comprises alkali metal alginate, calcium salt, tetrasodium pyrophosphate and filler, the alginate being from Laminaria hyperborea. The mixture sets to form a rubbery object.
Claims6
In a method of forming a molded object which comprises mixing together approximately 5-10 parts by weight of water and one part by weight of a molding powder mixture consisting essentially of from 7 to 15 percent by weight alkali metal alginate, a calcium salt in amount equal to about 1.2 times by wt. the amount of alkali metal alginate, and 3/4 to 3 percent tetrasodium pyrophosphate, the remainder being a filler selected from the group consisting of diatomaceous earth, silica, magnesium carbonate, and kaolin, allowing the mixture to set and gel in a mold, and drying the resulting gelled object outside the mold to form a smaller rigid object, the improvement which comprises employing the alginate from Laminaria hyperborea.
A method of forming a molded object which comprises mixing together approximately 6 parts of water and one part of a molding powder consisting essentially of from 7 to 15 percent alkali metal alginate from Laminaria hyperborea, an amount of calcium sulfate equal to about 1.2 times the amount of alkali metal alginate, and 3/4 to 3 percent tetrasodium pyrophosphate, the remainder being an inert filler, all parts and percentages being by weight, allowing the mixture to set and gel in a mold to form a rubbery object, and drying the rubbery object outside the mold to form a smaller rigid molded object.
A molding powder mixture consisting essentially of 7 to 15 percent alkali metal alginate from Laminaria hyperborea, an amount of calcium sulphate equal to 1.2 times the amount of alkali metal alginate, and 3/4 to 3 percent tetrasodium pyrophosphate, the remainder being an inert filler, all percentages being by weight.
Dependencies are inferred from the claim text.