Aqueous protective and adhesion promoting composition

Compositions: coating or plastic – Coating or plastic compositions – Silicon containing other than solely as silicon dioxide or...

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10628713, 10628714, 10628716, C09D 508, C09D18306, C09D18308

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active

057282030

ABSTRACT:
An aqueous composition for coating a metallic substrate that is prepared by mixing at least one silane (preferably at least two silanes), at least about 20 weight percent phosphoric acid based on the total weight of the composition, and water, wherein the composition is substantially free of an organic solvent and a chromium-containing compound. The pH of the composition must not be above 3. The composition can be coated on a metallic substrate, particularly an aluminum substrate, to provide a pre-treatment layer for adhering overcoats.

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CA 105:138325, Illarioonov et al, "Cold-hardenting mixture for making foundry molds and cores", Jun. 23, 1986.
CA 126:105549, Oono et al, "Primer compositions with improved adhesion strength", Nov. 19, 1996.
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