Electroplating additives
AssigneeCilag-Chemie A.G.
InventorsKurt Pluss, Bruno Romano De Martin
Life of this patent
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Abstract
Novel pyridyl alkyl sulfonic acid betaines useful as additives to nickel electroplating baths.
Claims4
In a bath for electro-depositing leveled and lustrous nickel and comprising an aqueous acidic solution of at least one nickel salt, the improvement wherein said bath comprises an additive having the formula:
- ##STR18## in which the substituent --(CH.sub.2).sub.n SO.sub.3.sup.- is in the 2- or 4- position of the pyridyl ring;
- n is the integer 1 or 2;
- and R is a member selected from the group consisting of methyl;
- methallyl;
- CH.sub.2 COOH;
- CH.sub.2 (CH.sub.2).sub.x CH.sub.2 SO.sub.3 Na wherein x is the integer 1 or 2;
- sodium 2-hydroxypropylsulfonate;
- sodium 2-hydroxybutylsulfonate;
- sodium 3-hydroxybutylsulfonate;
- benzyl;
- halobenzyl wherein said halo has an atomic weight less than 80;
- loweralkylbenzyl wherein said loweralkyl has from 1 to 4 carbons;
- and benzyl substituted with the group:
- ##STR19## wherein the substituent --(CH.sub.2).sub.n SO.sub.3.sup.- is in the 2- or 4-position of the pyridyl ring and n is the integer 1 or 2, in a concentration of about 0.05 - 2.0 grams per liter.
In a bath for electro-depositing leveled and lustrous nickel and comprising an aqueous acidic solution of at least one nickel salt, the improvement wherein said bath comprises the additive 2-[N-benzylpyridyl-(2)]-ethanesulfonic acid betaine in a concentration of from 0.1 to about 0.5 gram per liter.
In a bath for electro-depositing leveled and lustrous nickel and comprising an aqueous acid solution of at least one nickel salt, the improvement wherein said bath comprises the additive 2-[N-benzylpyridyl-(4)]-ethanesulfonic acid betaine in a concentration of from 0.1 to about 0.5 gram per liter.
In a bath for electro-depositing leveled and lustrous nickel and comprising an aqueous acid solution of at least one nickel salt, the improvement wherein said bath comprises the additive 1,2-bis-[2-(2-sulfoethyl)-pyridinium-(1)-methyl]-benzene in a concentration of from 0.1 to about 0.5 gram per liter.
Dependencies are inferred from the claim text.