Process for the preparation of a laminate.

摘要

A process for the production of a laminate is described wherein two hydrophobic thermoplastic resin sheets at least one of which carries (a) hydrophilic colloid layer(s) containing a photograph and/or other information are bonded together with the said layer(s) at the inner side, said process comprising the steps of : (1) treating said hydrophilic colloid layer(s) with an aqueous composition containing the self-cross-linking reaction product of: (i) an epihalohydrin or an Alpha-dihalohydrin, (ii) a water-soluble polyamide, and (iii) a water-soluble polyamine containing at least two nitrogen atoms separated by at least three carbon atoms and optionally also by at least one oxygen or sulphur atom and having at least two hydrogen atoms attached to different nitrogen atoms, (2) drying the layer(s) incorporating said reaction product, and (3) applying heat and pressure to cause the hydrophobic resin sheets to be bonded together with the hydrophilic colloid layer(s) arranged inbetween them. n