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US 4,062,738 AGranted
Acid nickel electroplating additive therefor and method of making said additive
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn Derek Rushmere
Life of this patent
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Abstract
Primary brightener additives and baths and processes for acid nickel electroplating are provided, as well as a process for making such additives. The additives contain mixtures of alkyne compounds, the major mole fractions of which consist of asymmetrical alkyne sulfonic acids.
Claims9
A process for making an additive for acid nickel electroplating baths, the process comprising
- a. contacting about 0.5 to 1.5 moles of propylene oxide with about 1 mole of liquid 2-butyne 1,4-diol in the presence of a boron trifluoride catalyst, to produce a first reaction product;
- b. contacting the first reaction product with about 1 to 2 moles of epichlorohydrin per mole of 2-butyne 1,4-diol, in the presence of a boron trifluoride catalyst, to produce a second reaction product;
- the amounts of propylene oxide in (a) and epichlorohydrin in (b) being such that the total amount of propylene oxide and epichlorohydrin used is 2 to 3 moles per mole of 2-butyne 1,4-diol, and then
- c. contacting the second reaction product with aqueous sodium sulfite.
1 more element
Dependencies are inferred from the claim text.