Claims
- 1. An aqueous electrolytic palladium plating bath having a pH of between about 4 and 14 and containing a palladium compound capable of being electrolytically plated and a water soluble quarternized pyridinium brightening agent in an amount of about 0.001 g/l up to their solubility limit of about 10 g/l which in said bath provides a cation of the formula ##SPC2##
- in which R is a benzyl radical, a saturated or unsaturated straight, branched or cyclic C.sub.1 -C.sub.6 aliphatic or hydroxyaliphatic radical or a polyalkylene oxide radical and R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each is a hydrogen atom or a halogen atom or a lower alkyl, lower alkenyl, hydroxyl, carboxyl, amino, lower alkylol, lower alkylcarboxyl, lower alkylamine, lower alkylol amino group or a group resulting from the reaction of the hydroxyl, carboxyl, amino, lower alkylol, lower alkylcarboxyl or lower alkylamine group with an alkyl sultone, an alkyl lactone or an epoxide.
- 2. The palladium plating bath of claim 1 in which said brightener in solution in said bath provides an anion which is a halogen atom or a tosylate, a mesylate, or a benzene sulfonate.
- 3. The palladium plating bath of claim 2 in which said brightener is N-benzyl-3-carboxypyridinium chloride.
- 4. The palladium plating bath of claim 2 in which said brightener is N-methyl-3-carboxypyridinium chloride.
- 5. The palladium plating bath of claim 2 in which said brightener is N-allyl-3-carboxypyridinium chloride.
- 6. The palladium plating bath of claim 2 in which said brightener is N-benzyl-3-carboxamidopyridinium chloride.
- 7. The palladium plating bath of claim 2 in which said brightener is N-allyl-2-methyl-5-vinylpyridinium bromide.
- 8. The palladium plating bath of claim 2 in which said brightener is N-methyl-3-carboxypyridinium tosylate.
- 9. The palladium plating bath of claim 2 in which said brightener is N-methyl-2-methyl-5-ethylpyridinium mesylate.
- 10. The palladium plating bath of claim 2 in which said brightener is N-methyl-2-vinylpyridinium benzene sulfonate.
- 11. The palladium plating bath of claim 2 in which said brightener is N-allylpyridinium bromide.
- 12. The palladium plating bath of claim 2 in which said brightener is N-[poly(2-hydroxypropoxy)]-3-carboxypyridinium chloride.
- 13. The palladium plating bath of claim 2 in which said brightener is N-[poly(2-hydroxypropoxy)]-2-aminopyridinium chloride.
- 14. The palladium plating bath of claim 2 in which said brightener is N-[poly(2-hydroxypropoxy)]-2-polyhydroxypropoxy amino pyridinium chloride.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 479,501, filed June 14, 1974, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3458409 |
Hayashi et al. |
Jul 1969 |
|
Non-Patent Literature Citations (1)
Entry |
B435,844, Jan. 1975, Skomoroski et al., 204/43 N. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
479501 |
Jun 1974 |
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