Ciba-Geigy Corporation

David A Taylor

Edward Irving

Terence J Smith

Kevin B Hatton

Robert J Lunn

Steven A Allen

John P Innocenzi

Alan H Haines

Glen R Ryan

Peter T Chasseaud

The present invention provides a process for preparing a sulphoxonium salt from the corresponding sulphonium salt which comprises oxidising the sulphonium salt using a peracid, under basic conditions, in a solvent other than a ketone. Some of the sulphoxonium salts are new compounds.

Preparation of sulphoxonium salts

A composition for priming and cleaning glass, aluminium or steel surfaces which comprises a solution in an organic solvent, optionally mixed with water, of an organosilane and a compound which generates an acid on exposure to actinic radiation.

Chemical composition

The present invention provides an adhesive composition comprising a polyurethane resin and, as adhesion promoter, a compound of formula I: ##STR1## in which Z is an organic radical which is derived from an aliphatic aromatic or heterocyclic polyisocyanate containing m+n isocyanate groups; m is a value greater than or equal to 1; n is a value greater than or equal to 0; m+n is a value greater than or equal to 2; Y is 0 or S; X is 0, S or N--C.sub.1 -C.sub.4 alkyl; R.sub.1 is C.sub.1 -C.sub.8 alkylene; R.sub.2 is C.sub.1 -C.sub.4 alkyl or two groups R.sub.2 together for m a C.sub.1 -C.sub.4 alkylene residue; R.sub.3 is C.sub.1 -C.sub.4 alkyl or phenyl; and q is a value from 0 to 2.

Adhesion promoters

Growing community of inventors

Cambridge, United Kingdom

David A Taylor