Anaerobically hardening adhesives and sealants containing organic nitrones
AssigneeHenkel & Cie G.m.b.H.
InventorsWerner Gruber, Joachim Galinke, Jurgen Keil
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Abstract
Organic nitrones are stabilizers for anaerobically-setting adhesive compositions wherein the principal adhesive component is a (meth) acrylic acid ester and the catalyst is an organic peroxide. The nitrone improves the storage-stability of the adhesives in contact with air.
Claims13
In an aerostable, anaerobically-setting adhesive composition comprising a polymerizable (meth) acrylate ester as principal latent adhesive component, a small but effective amount in the range of 0.1% to 20% by weight based on the weight of said composition of a hydroperoxide polymerization catalyst therefor derived from a hydrocarbon of C.sub.3 to C.sub.18 chain length, and an organic accelerator:
- a small but effective uniformly distributed amount in the range of 0.01% to 10% by weight based on the weight of said ester, of an organic nitrone as stabilizer for said composition.
A method for improving the stability of an aerostable, anaerobically-setting adhesive composition comprising a polymerizable (meth) acrylate ester as principal latent adhesive component, a small but effective amount in the range of 0.1% to 20% based on the weight of said composition of a hydroperoxide polymerization catalyst therefor derived from a hydrocarbon of C.sub.3 - C.sub.18 chain length, and an amine accelerator, which comprises:
- uniformly incorporating in said composition a small but effective amount, in the range of 0.01% to 10% by weight based on the weight of said ester, of an organic nitrone as stabilizer for said composition.
Dependencies are inferred from the claim text.