Teroson Gmbh

Heinz Sieger

Karl Reich

Heinz A Tomaschek

Adhesive composition consisting of .alpha.-cyanoacrylate, one or more sulphonic acid derivatives as stabilizers and conventional additives. The stabilizers are sulphonic acid derivatives having the general formula ##STR1## in which R.sup.1 is a trimethylsilyl group, R.sup.2 a halogen atom, an alkyl group, a perfluoroalkyl group, a cycloalkyl group or an aryl group or R.sup.1 and R.sup.2 together, accompanied by cyclization, represent a group of the general formula ##STR2## in which Z is a substituted or unsubstituted phenylene radical. Preferred are combinations of compounds in which in one R.sup.1 is a trimethylsilyl group and in the other R.sup.1 and R.sup.2 form the aforementioned ring group. (Dihydroxy)-organylboranes and bis(dihydroxyboryl)-derivatives can be used as costabilizers. The storage stability obtained with the stabilizers according to the invention is excellent, without impairing the setting rate and the strength of the bonds obtained.

Cyanoacrylate adhesive composition

A rapid setting .alpha.-cyanoacrylate-based adhesive composition having an improved stabilizer therein. The stabilizer is a sulfamide derivative containing the group ##STR1## Stabilizing may be further improved by using the sulfamides in combination with phenolic anti-oxidants, particularly sterically hindered phenols, without reducing the curing rate of the composition.

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Eppelheim, Germany

Heinz Sieger