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US 3,939,055 AGranted
Laminated asbestos diaphragm
AssigneePPG Industries, Inc.
InventorRobbie T. Foster
Life of this patent
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Abstract
Disclosed is a method of preparing an asbestos diaphragm where alkali metal ions are provided within the fibrous asbestos diaphragm, the diaphragm is heated to form an alkali metal silicate layer on the asbestos fibers, and thereafter a further layer of asbestos is deposited on the diaphragm.
Claims3
A laminated asbestos diaphragm comprising;
- 1. an asbestos mat, which mat has been treated by the process comprising:
- a. drawing an aqueous alkali metal hydroxide solution through said mat to provide alkali metal hydroxide within said mat;
- b. rendering the mat substantially free of water;
- and
- c. thereafter heating the mat in the substantial absence of water to between 110.degree. and 280.degree.C. for more than 2 hours;
- 2.
3 more elements
Dependencies are inferred from the claim text.