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Fluorinated alkyl esters are non-ionic coating additives commonly used for improved wetting of coatings. Improved adhesion of a coating to a surface can also be achieved with these materials.
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Fluorinated Alkyl Ester as an Adhesion Promoter
Fluorinated alkyl esters are non-ionic coating additives commonly used for
improved wetting of coatings. Improved adhesion of a coating to a surface can
also be achieved with these materials.
A 0.1-10.0% solids solution in, for example, CELLOSOLVE* acetate, MEK or
toluene, is applied to a surface, dried and baked at 100-150 degrees C. The
surface is coated with, for example, polyimide, and then cured. For some
applications, the fluorinated alkyl ester in concentration of approximately 0.05-
1.00% can be dispersed in the polyimide instead of being coated on the surface.
The polyimide wets readily, pin-hole free, and levels. The fluorinated alkyl
ester tends to displace contaminants to effect an improved interface. Adhesion
and uniformity of film are improved.
In summary, since the fluorinated alkyl esters wet preferentially, impart low
surface tension and have some reactivity, their use will promote adhesion for
polyimides, epoxies and urethanes on glass, metal oxides, ceramics and silicon.
* Trademark of Union Carbide Corporation.