Title: Baths and additives for the electrodeposition of bright zinc

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1. A zinc brightener additive for an aqueous, acid zinc electroplating bath, comprising, an aminated polyepichlorohydrin, said polyepichlorohydrin prepared by reacting polyepichlorohydrin with an amine selected from the group consisting of secondary aliphatic amines and secondary alicyclic amines at a temperature of from about 110.degree. C to about 170.degree. C, the amount of said amines is such so that between 50 percent to 100 percent of the chloro groups in said polyepichlorohydrin is reacted, and from about 1 to about 99 percent by weight of an ethylene oxide condensation product wherein from about 6 to about 30 moles of ethylene oxide are condensed with 1 mole of a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid, a long chain alkyl phenol, and naphthol.

2. A zinc additive according to claim 1 including from about 1 percent to about 20 percent by weight of an aromatic aldehyde or aromatic ketone.

3. A zinc additive brightener according to claim 2, wherein said aromatic ketone is benzylidene acetone.

4. A zinc additive brightener according to claim 1, wherein said amine is selected from the group consisting of dimethylamine, diethylamine, dipropylamine, diisopropylamine, methylethylamine, methyl propylamine, methyl isopropylamine, ethyl isopropylamine, N-methyl ethanolamine, N-methyl propanolamine, N-ethyl isopropanolamine, N-propyl propanolamine, N-propyl isopropanolamine, N-isopropyl isopropanolamine, diethanolamine, dipropanolamine, diisopropanolamine, morpholine, and piperidine.

5. A zinc brightener additive according to claim 4, wherein the molecular weight of said aminated polyepichlorohydrin ranges from about 1,000 to about 20,000.

6. A zinc additive brightener according to claim 1, wherein said ethylene oxide condensation product is a product resulting from a condensation of ethylene oxide and beta naphthol.

7. A zinc additive brightener according to claim 6, wherein there is present benzylidene acetone and the amount of said benzylidene acetone ranges from about 1 to about 20 percent by weight.

8. A zinc brightener additive according to claim 7, wherein said amine is selected from the group consisting of dimethylamine, diethylamine, dipropylamine, diisopropylamine, methylethylamine, methyl propylamine, methyl isopropylamine, ethyl isopropylamine, N-methyl ethanolamine, N-methyl propanolamine, N-ethyl isopropanolamine, N-propyl propanolamine, N-propyl isopropanolamine, N-isopropyl isopropanolamine, diethanolamine, dipropanolamine, diisopropanolamine, morpholine, and piperidine.

9. A zinc additive brightener according to claim 1, wherein said ethylene oxide condensation product is a product resulting from the condensation of ethylene oxide and a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid and a long chain alkyl phenol.

10. A zinc additive brightener according to claim 9, wherein there is present benzylidene acetone and wherein said benzylidene acetone ranges from about 1 percent to about 20 percent by weight.

11. A zinc brightener additive according to claim 10, wherein said amine is selected from the group consisting of dimethylamine, diethylamine, dipropylamine, diisopropylamine, methylethylamine, methyl propylamine, methyl isopropylamine, ethyl isopropylamine, N-methyl ethanolamine, N-methyl propanolamine, N-ethyl isopropanolamine, N-propyl propanolamine, N-propyl isopropanolamine, N-isopropyl isopropanolamine, diethanolamine, dipropanolamine, diisopropanolamine, morpholine, and piperidine.

12. An aqueous, acid zinc electroplating bath containing zinc ions for producing a bright electrodeposit of zinc comprising, having dissolved therein from about 1 to about 10 grams/liter of aminated polyepichlorohydrin, from about 1 to about 10 grams/liter of an ethylene oxide condensation product, and about 0.05 to about 0.5 grams/liter of at least one compound selected from the group consisting of aromatic aldehyde and aromatic ketone.

13. The bath of claim 12, wherein said aminated polyepichlorohydrin is prepared by reacting polyepichlorohydrin with an amine selected from the group consisting of secondary aliphatic amines and secondary alicyclic amines at a temperature of about 110.degree. C to about 170.degree. C, the amount of said amines is such so that between 50 percent and 100 percent of the chloro groups of said polyepichlorohydrin are reacted.

14. The bath of claim 13, wherein said ethylene oxide condensation product is formed by condensing at least 6 to about 30 moles of ethylene oxide with 1 mole of a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid and a long chain alkyl phenol wherein said long chain has from 6 to about 30 carbon atoms and naphthol.

15. A bath according to claim 14, wherein the pH of the solution is from about 4.0 to about 6.3.

16. A bath according to claim 15, wherein said secondary aliphatic amine and said secondary alicyclic amine is selected from the group consisting of dimethylamine, diethylamine, dipropylamine, diisopropylamine, methylethylamine, methyl propylamine, methyl isopropylamine, ethyl isopropylamine, N-methyl ethanolamine, N-methyl propanolamine, N-methyl isopropanolamine, N-ethyl propanolamine, N-ethyl isopropanolamine, N-isopropyl isopropanolamine, diethanolamine, dipropanolamine, diisopropanolamine, morpholine, and piperidine.

17. The bath of claim 16, wherein said ethylene oxide is condensed with a compound selected from the group consisting of beta naphthol, nonyl phenol, and nonyl alcohol.

18. The bath of claim 15, wherein said aromatic aldehydes and aromatic ketones are selected from the group consisting of benzylidene acetone, vanillan, heliotropin, anisaldehyde, veratraldehyde, acetophenone, acetonaphthone, cinnamic aldehyde, 2-chlorobenzaldehyde, and 2,6-dichlorobenzaldehyde.

19. The bath composition of claim 18, wherein said amines have from 2 to about 6 carbon atoms.

20. The bath of claim 18, wherein said temperature is from about 120.degree. C to about 150.degree. C.

21. The bath of claim 20, wherein said ethylene oxide condensation product is a product resulting from the condensation of ethylene oxide and beta naphthol.

22. The bath of claim 21, wherein said aromatic ketone is benzylidene acetone.

23. The bath of claim 20, wherein the molecular weight of said polyepichlorohydrin is from about 1,000 to about 20,000.

24. The bath of claim 20, wherein the molecular weight of said polyepichlorohydrin is from about 1,000 to about 5,000.

25. The bath composition of claim 18, wherein the aromatic ketone is benzylidene acetone.

26. The bath of claim 18, including ammonium chloride.

27. The bath of claim 26, including from about 100 to about 300 grams per liter of ammonium chloride.

28. The bath of claim 18, wherein the range of zinc ions is from about 7.5 to about 40 grams per liter.
Other info:

Inventors: Rosenberg, William E. (Strongsville, OH, US)

Application Number: 593310
Filing Date: 1975-07-07
Publication_date: 1976-10-26
Assignee: Columbia Chemical Corporation (Cleveland, OH)
Primary Class(es): 205/314 205/311, 205/312, 528/405
Other Classes:
US Patent Ref:

2383798	Aug, 1945	Hull	204/50.
3026270	Mar, 1962	Robinson	260/2.
3251852	May, 1966	De Groote et al.	260/2.
3577313	May, 1971	Bolger et al.	260/2.
3625684	Dec, 1971	Poot et al.	260/2.
3746678	Jul, 1973	Dick et al.	260/2.
3803008	Apr, 1974	Rosenberg et al.	204/55.
3824158	Jul, 1974	Rosenberg	204/55.
3838026	Sep, 1974	Koch	204/55.
3853718	Dec, 1974	Creutz	204/55.
3869358	Mar, 1975	Nobel et al.	204/55.

Other Refs: 1,910,46617,630

Sep, 1970	DT
Sep, 1972	JA

Primary Examiner: Kaplan, G. L.
Assistant Examiner:
Attorney: Oldham & Oldham Co.