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US 6,184,281 B2Granted
Strippable aqueous emulsion inomeric coating for recyclable plastic containers
AssigneeThe Glidden Company
InventorsGary P. Craun, Derek G. Rance
Life of this patent
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Abstract
Strippable aqueous a ionomeric coating composition suitable for coating plastic substrates where the coatings are easily removable by caustic treatment of the plastic during recycling of the plastic. The strippable ionomeric coatings comprise 80% to 99.8% by weight carboxyl functional aqueous addition copolymer (latex) intermixed with zinc or zirconium ammonium complex, where the zinc or zirconium complex interact during curing to provide ionomeric crosslinking with the.
Claims9
An aqueous dispersed protective coating composition containing an ionomeric binder, the iononmeric binder composition comprising by weight:
- (a) between 80% and 99.8% of an amine neutralized, carboxyl functional addition copolymer of emulsion copolymerized ethylenic unsaturated monomers in water of at least 5% carboxyl monomers, at least 10% hydrophobic monomers, with the balance being other ethylenic monomers, to produce a carboxyl functional emulsion copolymer having a number average molecular weight between about 5,000 and 10,000,000 and an Acid No. above about 25, where the carboxyl functional emulsion copolymer is neutralized with ammonia or a tertiary amine to produce a completely neutralized emulsion copolymer;
- (b) between 0.2% and 20% of an aqueous dispersed ammonium complex salt of zinc or zirconium as measured by zinc or zirconium metal;
- And where components (a) and (b) form a stabilized aqueous mixture but interract upon heat reacting an applied film of the coating composition to form a ionomeric clustering complex.
Dependencies are inferred from the claim text.