Coating processes – With post-treatment of coating or coating material – Chemical agent applied to treat coating
Patent
1990-12-14
1992-07-14
Lusignan, Michael
Coating processes
With post-treatment of coating or coating material
Chemical agent applied to treat coating
427340, 427239, 427377, 21050025, B05D 304
Patent
active
051301660
ABSTRACT:
The invention is a process for modifying pore size near the surface of porous materials. The surface is contacted with an alcohol solution of a metal alkoxide which forms a hydrous oxide insoluble in water, an amount of water insufficient to hydrolyze fully the metal alkoxide, and a mineral acid for a time sufficient for the solution to penetrate the surface region but not the bulk. This is followed by exposing to sufficient moisture to complete hydrolysis and then curing to stabilize the metal oxide in the pores near the surface.
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Dudash Diana L.
E. I. Du Pont de Nemours and Company
Krukiel Charles E.
Lusignan Michael
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