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US 4,377,457 AGranted
Dual cure coating compositions
AssigneeFreeman Chemical Corporation
InventorsRudolph H. Boeckeler, James R. Prom
Life of this patent
Estimating the term…
Abstract
Dual cure coating compositions are prepared by one of the following techniques: aminoplast crosslinking with residual hydroxy present on extended acrylated or UV cure polymers; oxidative crosslinking of backbone drying oil unsaturation following UV cure; or by employing UV chain extension via reaction of pendent allylic group with polymercaptans followed by a melamine heat cure. The coatings are cured by UV exposure followed by heating or air drying.
Claims5
A coating composition comprising:
- a first resin containing plural beta hydroxyl alkyl acrylate groups;
- a second resin consisting of an aminoplast resin;
- a photopolymerization initiator for said first resin, said initiator being selected from those initiators which decompose upon exposure to UV radiation to generate an acid catalyst for the cross-linking reaction of said aminoplast resin and the hydroxy groups of said first resin.
Dependencies are inferred from the claim text.