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Title: Additive compositions, baths, and methods for electrodepositing bright zinc deposits
Claims: The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A composition comprising the reaction product obtained by the process of (a) preparing an intermediate composition by reacting formaldehyde in water with a mixture of i. sulfamic acid, and ii. at least one aliphatic acyclic amine containing at least one primary amine group, and (b) reacting said intermediate composition with at least one epihalohydrin or glycerol halohydrin or mixtures thereof. 2. The composition of claim 1 wherein the epihalodhydrin is epichlorohydrin. 3. The composition of claim 1 wherein the aliphatic acyclic amine is represented by the formula ##STR6## wherein R is an alkylene group containing from about 2 to 10 carbon atoms, and R.sup.1 and R.sup.2 are each independently hydrogen or alkyl groups containing from 1 to about 5 carbon atoms. 4. The composition of claim 3 wherein R.sup.1 and R.sup.2 are alkyl groups containing 1 or 2 carbon atoms. 5. The composition of claim 1 wherein the intermediate composition is prepared from 1 to 4 molar parts of formaldehyde, 0.5 to 2 molar parts of sulfamic acid and 0.5 to 2 molar parts of amine, and the intermediate is reacted with 0.5 to 2 molar parts of epihalohydrin or glycerol halohydrin. 6. The composition of claim 5 wherein the molar ratio of sulfamic acid, amine compound, formaldehyde, amd epihalohydrin or glycerol halohydrin is within a range of from about 1:1:1:1 to about 1:1:4:1. 7. An additive composition for an aqueous acidic zinc electrodepositing bath comprising (A) at least one composition according to any of claims 1-6 and (B) at least one polyoxyalkylated naphthol. 8. The additive of claim 7 wherein the polyoxyalkylated naphthol has the formula ##STR7## wherein Y is from about 6 to about 40. 9. The additive composition of claim 7 wherein the composition also contains (C) at least one aromatic carbonyl containing compound. 10. The additive composition of claim 7 wherein the composition also contains (D) at least one nonionic or cationic wetting agent. 11. An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate which comprises zinc ions and (A) an amount, sufficient to provide a level and bright zinc electrodeposit, of at least one bath-soluble composition according to any of claims 1-6. 12. The plating bath of claim 11 wherein the bath also contains (B) at least one polyoxyalkylated naphthol. 13. The plating bath of claim 12 wherein the polyoxyalkylated naphthol has the formula ##STR8## wherein y is from about 6 to about 40. 14. The plating bath of claim 13 wherein the polyoxyalkylated naphthol is derived from a beta-naphthol. 15. The plating bath of claim 11 wherein the bath also contains (C) at least one aromatic carbonyl containing compound. 16. The bath of claim 15 wherein the aromatic carbonyl containing compound is benzylidene acetone. 17. The plating bath of claim 11 wherein the bath also contains (D) at least one nonionic or cationic wetting agent. 18. The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in an aqueous acidic zinc bath comprising zinc ions and, in an amount sufficient to provide a bright level zinc electrodeposit, (A) at least one bath-soluble composition according to any of claims 1-6. 19. The method of claim 18 wherein the bath also contains (B) at least one polyoxyalkylated naphthol. 20. The method of claim 19 wherein the polyoxyalkylated naphthol has the formula ##STR9## 21. The method of claim 20 wherein the polyoxyalkylated naphthol is derived from a beta-naphthol. 22. The method of claim 18 wherein the bath also contains (C) an aromatic carbonyl containing compound. 23. The method of claim 18 wherein the bath also contains (D) at least one nonionic or cationic wetting agent. Other info: Inventors: Willis, William J. (North Royalton, OH, US) Application Number: 894631 Filing Date: 1978-04-10 Publication_date: 1979-03-27 Assignee: R. O. Hull & Company, Inc. (OH) Primary Class(es): 205/314 528/265 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Kaplan, G. L. Assistant Examiner: Attorney: Maky, Renner, Otto & Boisselle |
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