Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Peter Grieshaber

Sameer H Eldin

Francedillaois Rime

Kurt Dietliker

Robert Peter Peyer

Jurg Maurer

Heterogeneous photo-initiators, photopolymerizable compositions and

Epoxy resin with anhydride, toughener and active hydrogen-containing

Polyether-amides with a specific viscosity of 0.25 to 2.5, measured at 30.degree. C. in a 2% solution in dimethylformamide, containing, based on the total amount of recurring structural elements in the polyether-amide, 100 to 10 mol % of the recurring structural element of the formula I ##STR1## and 90 to 0 mol % of the recurring structural element of the formula II

Crosslinkable polyether-amide

Process for the preparation of copolymers of definite specific viscosities from hydantoin vinyl ethers of the formula I and olefinically unsaturated compounds by free-radical polymerization of the monomers in a solvent mixture consisting of cyclohexane and toluene, it being possible to vary the specific viscosity of the copolymers within wide limits by altering the ratio of the two solvents. The meaning of the individual symbols can be seen in patent claim 1.

Process for the preparation of polymers of definite viscosities

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Zumholz, Switzerland

Peter Grieshaber