Chlorosulfonated polyethylene 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 polyethylene, (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 corrosion resistant.
Claims13
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 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) 9-44% 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 of the formula ##STR8## 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 two-component composition wherein the two components are mixed together to form a composition comprising about 10-80% by weight binder and 20-90% by weight organic solvent and wherein the binder consists essentially of about
- 40-85% by weight, of chlorosulfonated polyethylene,
- 9-44% by weight of epoxy resin,
- 3-20% by weight of polyamine curing agent, and
- 0.1-3% by weight of bicyclic amidine
- and wherein the the components comprise
- component (1) a solution 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% by weight and an epoxy resin.
- component (2) a polyamine curing agent of the formula ##STR18## where R is R.sup.1 NH.sub.2 and R.sup.1 is an aliphatic or cycloaliphatic radical and a bicyclic amidine.
Dependencies are inferred from the claim text.