Process for the production of thin coatings having optical and abrasion resistance properties
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United States of America Patent
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Dec 16, 1997
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app pub date -
Mar 25, 1997
filing date -
Apr 5, 1993
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Abstract
The present invention relates to a process for the production of thin coatings having optical and abrasion resistance properties. The object of the invention is to produce optical thin coatings having good mechanical strength characteristics, i.e. a good resistance to abrasion and an adequate adhesion to the substrate on which they are deposited. This object is achieved with the aid of a process comprising at least one cycle constituted by stages consisting of: applying to a substrate (1) at least one antireflection sol-gel coating (3) constituted by a colloidal silicon oxide suspension dispersed in an aliphatic alcohol, allowing said antireflection coating (3) to dry, subjecting the substrate (1) covered with said colloidal silica coating (3) to an alkaline treatment in a liquid or gaseous medium.
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