Claims
- 1. A method of making a cellular article, comprising mixing a solid, substantially inert, and stable borohydride blowing agent concentrate prepared from a dried alkali metal borohydride and a dried inert resinous polymer in which reactive protonic hydrogen atoms are substantially absent; said concentrate mixture consisting essentially of from about 0.5% to 20% by weight of said alkali metal borohydride, less than about 0.1% adsorbed water, balance essentially said dry inert resinous polymer with a resinous polymer and an effective amount of an activating agent capable of donating a proton to said alkali metal borohydride so as to hydrolyze said alkali metal borohydride and thereby form a cellular article; said hydrolyzing occurring while said resinous polymer is in the molten condition.
- 2. The method of claim 1 wherein:
- said activating agent comprises a finely divided high surface area solid having a proton source adsorbed on its surface.
- 3. The method of claim 2 wherein:
- said finely divided high surface area solid comprises silica.
- 4. The method of claim 3 wherein:
- said proton source is a member selected from the group consisting of water, mineral acid, carboxylic acids, alcohol, sulfonic acids, polyacrylic acid, or polystyrene sulfonic acid.
- 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)
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Number |
Date |
Country |
Parent |
272867 |
Jun 1981 |
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