Chlorosulfonated ethylene vinyl acetate polymer coating composition
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 ethylene vinyl acetate polymer, (2) an epoxy resin, (3) a polyamine curing agent, and (4) a bicyclic amidine. The composition is used as a primer or topcoating for metal substrates and curings at ambient temperatures and provides a finish that has excellent adhesion to the substrate and is tough, durable, weatherable and when pigmented with electrically conductive pigments, can be used as a coating for electrodes used in electrochemical reactions such as grids used in lead acid storage batteries.
Claims23
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) 40-85% by weight, based on the weight of the binder, of a chlorosulfonated ethylene vinyl acetate polymer having about 10-30% by weight of polymerized vinyl acetate, a melt index of about 350-10,000, containing about 40-48% by weight chlorine and up to 3% by weight sulfur present as combined sulfonyl chloride groups;
- (2) 9-44% by weight, based on the weight of the binder, of an epoxy resin selected from the group consisting of an epoxy resin having the formula ##STR8## where R.sup.2 is an aromatic radical and b is a positive integer of about 0.5 to 4, and an epoxy novolac resin of the formula ##STR9## where d is a positive integer of about 0.2-2, (3) 3-20% by weight, based on the weight of the binder, of a polyamine curing agent of the formula ##STR10## where R is R.sup.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical;
- and
- (4) 0.1-3% by weight, based on the weight of the binder, of a bicyclic amidine.
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 ethylene vinyl acetate polymer having about 10-30% by weight of polymerized vinyl acetate, a melt index of about 350-10,000, containing about 40-48% by weight chlorine and up to 3% by weight sulfur present as combined sulfonyl chloride groups;
- (2) 7-60% by weight, based on the weight of the binder, of an epoxy resin selected from the group consisting of an epoxy resin having the formula ##STR17## where R.sup.2 is an aromatic radical and b is a positive integer of about 0.5 to 4 and an epoxy novolac resin having the formula ##STR18## where d is a positive integer of about 0.2-2, (3) 3-20% by weight, based on the weight of the binder, of a polyamine curing agent selected from the group consisting of ##STR19## where R is R.sup.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical, R.sup.4 is C or a hydrocarbon group, R.sup.3 is H or CH.sub.3, when x is 3, R.sup.4 is a hydrocarbon group and when x is 4, R.sup.4 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 ethylene vinyl acetate polymer having about 10-30% by weight of polymerized vinyl acetate, a melt index of about 350-10,000, containing about 40-48% by weight chlorine and up to 3% by weight sulfur present as combined sulfonyl chloride groups;
- (2) 7-60% by weight, based on the weight of the binder, of an epoxy resin selected from the group consisting of an epoxy resin having the formula ##STR20## where R.sup.2 is an aromatic radical and b is a positive integer of about 0.5 to 4 and an epoxy novolac resin of the formula ##STR21## where d is a positive integer of about 0.2-2, (3) 3-20% by weight, based on the weight of the binder, of a polyamine curing agent selected from the group consisting of ##STR22## where R is R.sup.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical;
- R.sup.4 is C or a hydrocarbon group, R.sup.3 is H or CH.sub.3, when x is 3, R.sup.4 is a hydrocarbon group and when x is 4, R.sup.4 is C and
- 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.