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US 4,339,310 AGranted
Method of surface treatment of tin plated cans and tin plated steel sheets
AssigneeHooker Chemicals & Plastics Corporation
InventorsNobuyuki Oda, Haruyoshi Terada
Life of this patent
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Abstract
An aqueous chromium-free composition is useful for imparting a corrosion resistance paintable coating to a tin surface. The composition contains a titanium or zirconium compound, a pyrazole derivative, a myoinositol phosphate ester and a silicon compound. The surface is either chemically coated via contact with the composition or electrolytically coated via immersion in the composition.
Claims8
A chromium-free aqueous composition, comprising:
- (a) at least one soluble compound selected from the group consisting of titanium and zirconium compounds;
- (b) at least one pyrazole compound of the formula:
- ##STR5## wherein X, Y and Z are independently selected from the group consisting of hydrogen atom, hydroxyl group, alkyl group of up to 5 carbon atoms, amino group and nitro group;
- (c) at least one myoinositol phosphate ester having 2-6 phosphate groups per molecule;
- and
- (d) at least one silicon compound;
- said composition exhibiting a pH value in the range of from 1.0 to 10.0.
4 more elements
Dependencies are inferred from the claim text.