Claims
- 1. 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. The method of claim 1 wherein:
- said dry blended mixture contains from about 2% to 10% by weight of said alkali metal borohydride.
- 3. The method of claim 1 wherein:
- said alkali metal borohydride is a member selected from the group consisting of sodium borohydride or potassium borohydride.
- 4. The method of claim 1 wherein:
- said inert resinous polymer is a member selected from the group consisting of polyolefins, polydienes, polystyrene, polyphenylene oxide-styrene, polyacrylates, polyvinylchloride, or polyvinylacetate.
- 5. The method of claim 1 wherein:
- said alkali metal borohydride is sodium borohydride.
Parent Case Info
This application is a division of application Ser. No. 272,867, filed June 12, 1981, and now abandoned.
US Referenced Citations (12)
Non-Patent Literature Citations (1)
Entry |
L. J. Guilbault, "Polyolefin Stabilization with SBH Maintains Product Quality During Melt Processing", P.S.P. Newsletter, Issue 4, Dec. 1980. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
272867 |
Jun 1981 |
|