Optical adhesives - comprising unmodified low molecular epoxy! resin and N,N-di:benzyl-ethylene-di:amine

摘要

Adhesive are based on (a) unmodified low molecular epoxy resins with >=2 epoxy gps/mol and (b) N,N'-dibenzylethylenediamine (I) opt. together with (c) 0.5-49 mol.% (on total amine) of further amine polyaddition components with 2 amine H atoms/mol (II) or 0.5-30 mol.% (on total amine) amine polyaddition components with >=3 reactive amine H atoms/mol (III). The adhesives have alow initial viscosity and increased pot life, but the cure time at room temp. or elevated temps. is not increased. No reactive diluents or plasticisers are required, so that the physiological properties of the compsn. are improved considerably wrt prior art compsns. The prods. are clear, colourless fog-free materials with excellent optical properties, useful for bonding high quality optical components e.g. in the prodn. of compound optics and for mounting optical gear in frames, etc.