Henkel & Cie G.m.b.h.

Jurgen Keil

Werner Gruber

Joachim Galinke

Organic percarboxylic acids 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 percarboxylic acid improves the storage-stability of the adhesives in contact with air.

Anaerobically hardening adhesives and sealants containing an organic

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.

Anaerobically hardening adhesives and sealants containing organic

Organic hydrazones (compounds which contain the =N--N=C= structure) are accelerators for aerostable anaerobically-setting adhesive compositions. They can be used with stabilizers. Preferred hydrazones are acetophenone hydrazone, methyl ethyl ketone hydrazone, methyl isobutyl ketone hydrazone. These provide rapid setting times with good ultimate strength, and have little adverse effect upon the storage stability of the compositions when access of molecular oxygen is permitted. Diacetyl hydrazone provides best ultimate strength.

Anaerobically hardening adhesives and sealants containing a hydrazone

Organic sulfonyl hydrazones are accelerators for aerostable, anaerobically-setting adhesive compositions. They provide rapid setting of the adhesive with formation of bonds of good strength, and have little adverse effect upon the storage stability of the compositions when access of molecular oxygen is permitted.

Organic hydrazines are accelerators for aerostable, anaerobically-setting adhesive compositions. They can be used with stabilizers. Preferred hydrazines are aryl hydrazines which carry electronegative groups, for example 2,4-dinitrophenylhydrazine.

Organic disulfonamides are accelerators for aerostable, anaerobically-setting adhesive compositions. They provide rapid setting of the adhesive with formation of bonds of good strength, and have little adverse effect upon the storage stability of the compositions when access of molecular oxygen is permitted.

Organic sulfonic acid hydrazides are accelerators for aerostable anaerobically-setting adhesive compositions. They can be used with stabilizers. Preferred hydrazides of this group are the aryl sulfonic acid hydrazides, for example benzene sulfonic acid hydrazide. These provide rapid setting time with good ultimate strength, and have little adverse effect on the storage stability of the compounds when access of air is permitted.

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Jurgen Keil