Ciba-geigy Corporation

Ciba-geigy Ag

Arnold Hofer

Hans Gempeler

Alex Wegmann

James H Astbury

Rene Graf

Hildegard Schneider

Nikolaus Siegenthaler

Epoxy resin compositions comprising an epoxy resin which is liquid at room temperature and has on average more than one epoxy group per molecule and a quaternary perhydroazepinium salt or a quaternary octahydroazocinium salt as advancement catalyst, when advanced with compounds having two phenolic hydroxyl groups, give excellent products having low viscosity and good viscosity stability, which products can be used, for example, for surface protection, preferably as binder for coatings and paints.

Epoxy resin mixtures containing advancement catalysts

Advanced epoxy resins are disclosed which can be obtained by reacting liquid or semi-solid aromatic opoxy resins with aliphatic diols, and subsequently reacting the reaction product with mono- or binuclear bisphenols in the presence of a cyclic quaternary ammonium salt.

Novel epoxy resins

An epoxy resin composition comprising an epoxy resin which is solid at room temperature and contains on average more than epoxy group per molecule, and a quaternary pyrrolidinium salt as advancement catalyst. When advanced with compounds containing two phenolic hydroxyl groups, these compositions give excellent products of low viscosity which are suitable, for example, for use in powder resin coating.

Epoxy resin compositions

An epoxy resin composition comprising an epoxy resin which is solid at room temperature and contains on average more than epoxy group per molecule, and a quaternary morpholinium salt as advancement catalyst. When advanced with compounds containing two phenolic hydroxyl groups, these compositions give excellent products of low viscosity which are suitable, for example, for use in powder resin coating.

An epoxy resin composition comprising an epoxy resin that is liquid at room temperature and containing on average more than one epoxy group per molecule and a quarternary piperidinium salt as advancement catalyst. When advanced with compounds having two phenolic hydroxyl groups, such compositions give excellent products of low viscosity which are suitable, for example, for use in powder coating compositions.

A pressure-sensitive recording material which contains, on at least one support, at least one color former and one inorganic developer therefor applied in the form of coatings, said coatings additionally containing a urea-formaldehyde condensate with a BET specific surface area of 3 to 30 m.sup.2 /g.

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Muttenz, Switzerland

Arnold Hofer