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US 4,394,458 AGranted
Alkali metal borohydride concentrate
AssigneeThiokol Corporation
InventorRobert C. Wade
Life of this patent
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Abstract
Alkali metal borohydride concentrates are prepared by dry blending alkali metal borohydride powder with a dry non-reactive plastic resin, melting and extruding the blended mixture to form an encapsulated alkali metal borohydride concentrate, and then chopping the extrusion into pellets. The pellet concentrate may then be blended into other materials.
Claims5
A method of making a solid, substantially inert, and stable alkali metal borohydride blowing agent concentrate, comprising:
- a. dry blending from 0.5% to 20% by weight of dried alkali metal borohydride with a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent to form a mixture thereof containing less than about 0.1% by weight adsorbed water;
- b. heating said mixture to a temperature above the melting point of said resin to form a molten mixture;
- c. extruding said molten mixture to form a solid, stable and substantially inert concentrate;
- and
- d. forming said extruded and cooled concentrate into pellets.
2 more elements
Dependencies are inferred from the claim text.