Cathode-depolarizer mix containing a polyacrylamide binder

Claim 2

A galvanic cell having an anode; a cathode-depolarizer mix containing manganese dioxide, a carbonaceous conductive material and an electrolyte; and a separator interposed between said anode and said cathode-depolarizer mix and also containing a portion of the electrolyte; the improvement comprising discrete particles of polyacrylamide in said cathod-depolarizer mix in an amount ranging between about 0.1% to about 1.5% based on the weight of the cathode-depolarizer mix.

Claim 3

The galvanic cell of claim 1 wherein said electrolyte comprising at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate.

Claim 4

The galvanic cell of claim 1 wherein said polyacrylamide is present in an amount between about 0.1 % and about 0.7 % based on the weight of the cathode-depolarizer mix.

Claim 5

The galvanic cell of claim 1 wherein said polyacrylamide has a molecular weight of between about 0.5 million and about 8 million.

Claim 6

The galvanic cell of claim 1 wherein said cathode-depolarizer mix is in the form of a discrete mix body.

Claim 7

The galvanic cell of claim 2 wherein the halogen-containing compounds are ammonium chloride and zinc chloride.

Claim 8

The galvanic cell of claim 2 wherein the halogen-containing compound is zinc chloride.

Claim 9

The galvanic cell of claim 2 wherein the halogen-containing compound is selected from the group consisting of magnesium perchlorate, magnesium bromide and mixtures thereof.

Claim 10

The galvanic cell of claim 1 wherein the polyacrylamide is present in an amount between about 0.1% and about 0.7% based on the weight of the mix and wherein said polyacrylamide has a molecular weight between about 3 million and about 6 million.

Claim 11

A process for making a discrete cathode-depolarizer mix body for galvanic cells which comprises: a. blending a dry mix comprising particulate manganese dioxide, a particulate carbonaceous conductive material, particulate polyacrylamide and a particulate, dry electrolyte salt comprising at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate. b. blending the blend of step a) with a liquid selective from the group consisting of water and an aqueous solution of at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate, until a homogeneous blend is obtained; and c. molding the homogeneous blend into a discrete cathode-depolarizer mix body.

Claim 12

A process for making a discrete cathode-depolarizer mix body for galvanic cells which comprises: a. blending a dry mix comprising particulate manganese dioxide, a particulate carbonaceous conductive material, particulate polyacrylamide and a particulate, dry electrolyte salt comprising at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate. b. blending the blend of step a) with a liquid selective from the group consisting of water and an aqueous solution of at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate, until a homogeneous blend is obtained; and c. molding the homogeneous blend into a discrete cathode-depolarizer mix body.

Claim 13

A process for making a discrete cathode-depolarizer mix body for galvanic cells which comprises: a. blending a dry mix comprising particulate manganese dioxide, a particulate carbonaceous conductive material and particulate polyacrylamide; b. blending the blend of step a) with an aqueous solution of at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate, until a homogeneous blend is obtained; and c. molding the homogeneous blend into a discrete cathode-depolarizer mix body.

Claim 14

A process for making a discrete cathode-depolarizer mix body for galvanic cells which comprises: a. blending a dry mix comprising particulate manganese dioxide, a particulate carbonaceous conductive material and particulate polyacrylamide; b. blending the blend of step a) with an aqueous solution of at least one halogen-containing compound selected from the group consisting of zinc chloride, zinc bromide, zinc perchlorate, ammonium chloride, magnesium chloride, magnesium bromide and magnesium perchlorate, until a homogeneous blend is obtained; and c. molding the homogeneous blend into a discrete cathode-depolarizer mix body.