Electrolytes for the electrolytic deposition of zinc

Claim 2

AN AQUEOUS ALKALINE ZINCATE BATH SUITABLE FOR DEPOSTING BRIGHT METALLIC ZINC DEPOSITS AND CONTAINING LESS THAN ABOUT 2 OZ./GAL. OF CYANIDE THEREIN, SAID BATH COMPRISING AN AQUEOUS ALKALINE SOLUTION HAVING DISSOLVED THEREIN: A. A SOLUBLE ZINC COMPOUND CAPBLE OF BEING PLATED BY ELECTROYTIC DEPOSITION, AND B. AT LEAST ABOUT 0.1 GM./L OF A WATER SOLUBLE POLYMER CONTAINING REPEATING TETIARY AND/OR QUATERNARY AMINE GROUPS, SAID POLYMERS HAVING BEEN PREPARED BY (I) POLYMERIZING AN ALIPHATIC AMINE WITH AN EPIHALOHYDRIN, SAID POLYMERIZATION BEING CARRIED OUT FOR A SUFFICIENT LENGTH OF TIME, AND SAID REACTANTS BEING PRESENT IN SUCH A MOLAR RATIO, SO AS TO PRODUCE A POLYCONDENSATE HAVING REPEATING TERTIARY AND/OR QUATERNARY AMINE GROUPS AND HAVING A 5 MOLECULAR WEIGHT ABOVE ABOUT 250 BUT BELOW THAT WHICH WOULD RENDER THE POLYCONDENSATE WATER INSOLUBLE OR INSOLUBLE IN THE ALKALINE ZINCATE BATH.

Claim 3

The aqueous alkaline zincate bath of claim 1 wherein a secondary aldehyde brightener is dissolved therein in a sufficient amount to increase the brightness of the deposit.

Claim 4

The aqueous alkaline zinc bath of claim 1 in which the soluble polymer containing repeating tertiary amine groups is reacted with a sufficient amount of a quaternizing agent to convert amine grOups to repeating quaternary amine groups.

Claim 5

An aqueous alkaline zincate bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal of cyanide therein, said bath comprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm./l of a water soluble polymer containing repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) polymerizing an aliphatic amine comtaining a primary amine group with an epihalohydrin, said polymerization being carried out for a sufficient length of time, and said reactants being present in such a molar ratio, so as to produce a polycondensate having repeating secondary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath, and (ii) reacting said polycondensate with a sufficient amount of a quaternizing agent to convert repeating secondary amine groups into repeating tertiary and/or quaternary amine groups.

Claim 6

An aqueous alkaline zincate bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal of cyanide therein, said bath comprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm./l of a water soluble polymer containing repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) polymerizing an aliphatic amine comtaining a primary amine group with an epihalohydrin, said polymerization being carried out for a sufficient length of time, and said reactants being present in such a molar ratio, so as to produce a polycondensate having repeating secondary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath, and (ii) reacting said polycondensate with a sufficient amount of a quaternizing agent to convert repeating secondary amine groups into repeating tertiary and/or quaternary amine groups.

Claim 7

The aqueous alkaline zincate bath of claim 4 wherein a secondary aldehyde brightener is dissolved therein in a sufficient amount to increase the brightness of the deposit.

Claim 8

An aqueous alkaline zincate bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal. of cyanide therein, said bath comprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm/l of a water soluble polymer containing repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) reacting and aliphatic amine containing a secondary or tertiary amine group with a polyepihalohydrin, said reaction being carried out for a sufficient length of time and said reactants being present in such a molar ratio, so as to produce a polycondensate having repeating tertiary and/or quaternary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath.

Claim 9

An aqueous alkaline zincate bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal. of cyanide therein, said bath comprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm/l of a water soluble polymer containing repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) reacting and aliphatic amine containing a secondary or tertiary amine group with a polyepihalohydrin, said reaction being carried out for a sufficient length of time and said reactants being present in such a molar ratio, so as to produce a polycondensate having repeating tertiary and/or quaternary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath.

Claim 10

The aqueous alkaline zincate bath of claim 6 wherein a secondary aldehyde brightener is dissolved therein in a sufficient amount to increase the brightness of the deposit.

Claim 11

The aqueous alkaline zinc bath of claim 6 in which the soluble polymer containing repeating tertiary amine groups is reacted with a sufficient amount of a quaternizing agent to convert amine groups to repeating quaternary amine groups.

Claim 12

An aqueous alkaline zincte bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal. of cyanide therein, said bath commprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm./l of water soluble polymer comprising repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) reacting an aliphatic amine containing a primary amine group with a polyepihalohydrin, said reaction being carried out for a sufficient length of time and said reactants being present in such a molar ratio, so as to produce a reaction product having repeating secondary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath and (ii) reacting the reaction product of the polyepihalohydrin containing the secondary amine groups with a sufficient amount of a quaternizing agent to convert repeating secondary amine groups into repeating tertiary and/or quaternary amine groups.

Claim 13

An aqueous alkaline zincte bath suitable for depositing bright metallic zinc deposits and containing less than about 2 oz./gal. of cyanide therein, said bath commprising an aqueous alkaline solution having dissolved therein: a. a soluble zinc compound capable of being plated by electrolytic deposition; and b. at least about 0.1 gm./l of water soluble polymer comprising repeating tertiary and/or quaternary amine groups, said polymers having been prepared by (i) reacting an aliphatic amine containing a primary amine group with a polyepihalohydrin, said reaction being carried out for a sufficient length of time and said reactants being present in such a molar ratio, so as to produce a reaction product having repeating secondary amine groups and having a molecular weight above about 250 but below that which would render the polycondensate water insoluble or insoluble in the alkaline zincate bath and (ii) reacting the reaction product of the polyepihalohydrin containing the secondary amine groups with a sufficient amount of a quaternizing agent to convert repeating secondary amine groups into repeating tertiary and/or quaternary amine groups.

Claim 14

The aqueous alkaline zincate bath of claim 9 wherein a secondary aldehyde brightener Is dissolved therein in a sufficient amount to increase the brightness of the deposit.