Electrically conductive coating composition of a chlorosulfonated polyethylene
AssigneeE. I. Du Pont de Nemours and Company
InventorJoseph A. Vasta
Life of this patent
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Abstract
A coating composition containing 10-80% by weight of binder and 20-90% by weight of an organic solvent in which the binder is (1) a chlorosulfonated polyethylene, (2) an epoxy resin, (3) a polyamine curing agent, and optionally (4) a bicyclic amidine or a strong organic base. The composition contains electrically conductive pigments such as carbon black and graphite to provide an electrically conductive film. The composition is used on grids of lead acid storage batteries to prolong the life of the battery or to reduce size and weight of the battery while maintaining power output of the battery.
Claims24
A coating composition comprising 10-80% by weight of binder and 20-90% by weight of an organic solvent;
- wherein the binder consists essentially of about
- (1) 35-90% by weight, based on the weight of the binder, of a chlorosulfonated polyethylene having a weight average molecular weight of about 75,000 to 300,000 determined by gel permeation chromatography and having a chlorine content of 20 to 50% by weight and a sulfur content of 0.7 to 2.0% by weight;
- (2) 7-60% by weight, based on the weight of the binder, of an epoxy resin;
- (3) 3-20% by weight, based on the weight of the binder, of a polyamine curing agent selected from the group consisting of ##STR9## where R is R.sub.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical;
- R.sup.2 is C or a hydrocarbon group, R.sup.3 is H or CH.sub.3, when x is 3 R.sup.2 is a hydrocarbon group and when x is 4 R.sup.2 is C;
- wherein the coating composition contains electrically conductive pigments in a pigment to binder weight ratio of about 50/100 to 300/100 and a dry film of the coating composition 25 microns thick has an electrical resistance of about 1-50 ohms.
A coating composition comprising 10-80% by weight of binder and 20-90% by weight of an organic solvent;
- wherein the binder consists essentially of about
- (1) 35-90% by weight, based on the weight of the binder, of chlorosulfonated polyethylene having a weight average molecular weight of about 75,000 to 300,000 determined by gel permeation chromatography and having a chlorine content of 20 to 50% by weight and a sulfur content of 0.7 to 2.0% by weight;
- (2) 7-60% by weight, based on the weight of the binder, of an epoxy resin;
- (3) 3-20% by weight, based on the weight of the binder, of a polyamine curing agent selected from the group consisting of ##STR20## where R is R.sup.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical, R.sup.2 is C or a hydrocarbon group, R.sup.3 is H or CH.sub.3 when x is 3, R.sup.2 is a hydrocarbon group and when x is r R.sup.2 is C.
A coating composition comprising 10-80% by weight of binder and 20-90% by weight of an organic solvent;
- wherein the binder consists essentially of about
- (1) 35-90% by weight, based on the weight of the binder, of a chlorosulfonated polyethylene having a weight average molecular weight of about 75,000 to 300,000 determined by gel permeation chromatography and having a chlorine content of 20 to 50% by weight and a sulfur content of 0.7 to 2.0% by weight;
- (2) 7-60% by weight, based on the weight of the binder, of an epoxy resin;
- (3) 3-20% by weight, based on the weight of the binder, of a lead compound curing agent;
- wherein the coating composition contains electrically conductive pigments in a pigment to binder weight ratio of about 50/100 to 300/100 and a dry film of the coating composition 25 microns thick has an electrical resistance of about 1-50 ohms.
Dependencies are inferred from the claim text.