Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Aloysius H Manser

Jacques Francois

Godwin Berner

Rolf Mulhaupt

Dieter Strasilla

Urs Gruber

The present invention relates to a process for preparing a laminated structure containing at least a main foil which is substantially impervious to light, B) at least one interlayer, and C) a covering foil which is substantially light-permeable. The layers are bonded together using a UV-curable and/or VIS-curable composition. The interlayer, prior to contact with the curable composition, is substantially impervious to the irradiation necessary for curing the curable composition and becomes transparent when impregnated with the curable composition so as to effect polymerization of multiple layers of curable composition in one irradiation step. The laminated structure is prepared by applying a layer of the curable composition to the main foil A), applying the interlayer B) to the main foil A), applying a further layer of the curable composition to the interlayer B), applying a covering foil C) to the interlayer B), and irradiating the laminated structure so obtained through the covering foil C) with UV- and/or VIS-radiation

Process for the production of an information carrier

The invention relates to a substantially solventless curable resin composition, in particular for the fabrication of prepregs, which contains more than 45% by weight of substances which are solid at ambient temperature at least or at lower temperature, and which, in addition to comprising customary modifiers, comprises solid epoxy resins or a mixture of liquid and solid epoxy resins, at least one initiator which is sensitive to UV radiation for the polymerisation of the epoxy resins and has the formula I ##STR1## wherein a and b are each independently of the other 1 or 2, R.sup.1 ist a .pi.-arene, R.sup.2 is a .pi.-arene, an indenyl anion or a cyclopentadienyl anion, [X].sup..crclbar. is an anion [LQ.sub.m ].sup..crclbar. or the anion of a partially fluorinated or perfluorinated aliphatic or aromatic sulfonic acid, L is B, P, As or Sb, Q is F, with the proviso that some of the radicals Q may also be hydroxyl groups, and m is the valency of L increased by one, and at least one further compound which contains one or more than one carboxyl group, which composition, by heating to a temperature in the range from 60.degree. to 140.degree. C., excluding UV light and without the addition of a solvent, is convertible into a liquid state, and, by cooling to a temperature not exceeding ambient temperature and excluding UV light, can be convened from said liquid state into a solid composition which is chemically substantially still unchanged and has a softening point of -3.degree. C. and higher, and which is tack-free or substantially tack-free at ambient temperature. Prepregs can be fabricated from these compositions in simple manner without the use of solvents.

Solventless curable resin composition, in particular for the fabrication

There are disclosed laminated structures which are bonded with a UV-/VIS-curable composition and which consist of a main foil A) which is substantially impervious to light, at least one interlayer B) which is substantially impervious to light in the absence of the adhesive and which carries on the side with its back to the main foil information in the form of a color pattern, and of a substantially light-permeable covering foil C). The laminated structures can be used as identity cards.

Information carrier and process for the production thereof

Epoxy resin compositions containing polyester flexibilizer and

There are obtained by mixing together approximately equal parts of 1-benzoylcyclohexanol and benzophenone or a benzophenone derivative liquid mixtures which possess a high activity as photoinitiators for the polymerization of ethylenically unsaturated compounds. The level of activity is higher than that of the individual components taken separately.

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Allschwil, Switzerland

Aloysius H Manser