Method for depositing a fluorocarbonsulfonic acid polymer on a support from a solution
AssigneeThe Dow Chemical Company
InventorsCharles W. Martin, Bobby R. Ezzell, John D. Weaver
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Abstract
This invention discloses improved heterogeneous acid catalysts and a method for preparing these catalysts. A heterogeneous acid catalyst has been prepared by treating a carrier material with a solution containing a fluorocarbonsulfonic acid polymer dissolved in a suitable solvent, removing the solvent, and heat treating the coated carrier in such a way so as to prevent the polymer from being leached off the carrier. The final heat treatment of the composition to prevent the polymer from redissolving comprises an improvement in the preparation of a heterogeneous catalyst.
Claims14
The method of supporting a fluorinated polymer having pendant chains containing sulfonic acid groups, on a support, comprising the steps:
- (a) soaking a substrate with a solution that contains a fluorinated polymer having pendant chains containing sulfonic acid groups;
- (b) removing the solvent from the mixture;
- (c) heating the remaining composition to above the glass transition temperature of the polymer for a sufficient time to render the polymer insoluble.
Dependencies are inferred from the claim text.