Pretreating inorganic surfaces with ammonium salt of thioglycolic acid
AssigneeMohammed N. Al-Hajry
InventorClifford G. Howse
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Abstract
A method of treating inorganic materials such as metals to ensure strong adhesion of a subsequently applied coating of another material, such as a paint, comprises the steps of applying to a surface of the material a composition containing a complexing agent comprising both a sulph-hydro and a carboxylic acid group and applying over the complexing agent a film-forming coating which also contains a complexing agent comprising both a sulph-hydro and a carboxylic acid group and/or an anti-oxidant.
Claims8
A method of treating a surface of an inorganic material comprising the steps of applying to a surface of the material a composition containing an alkaline solution of an ammonium salt of thioglycolic acid and applying over the said composition a film-forming coating composition which is based on a resin selected from the group consisting of polyurethane resins, alkyd resins and epoxy resins and which also contains an ammonium salt of thioglycolic acid and/or an anti-oxidant.
Dependencies are inferred from the claim text.