Loctite Corporation

John F O'Grady

Richard D Rich

David P Melody

Daniel A Doherty

Curable acrylate ester compositions having as an accelerator for the polymerization a hydrazine derivative of the formula R.sup.1 --HN--NH--CO--R.sup.2 and as a co-accelerator, an acid having a pK.sub.a of less than about 6. The compositions may optionally be formulated as two-part compositions with the non-ester-containing part being applied as a primer. Typical of the monomers are the polyalkylene glycol dimethacrylates and the so-called urethane acrylates. Polymerization is preferably initiated by a peroxy compound such as cumene hydroperoxide, such a composition having anaerobic curing characteristics.

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Dublin, Ireland

John F O'Grady