Patent ID: 6893683

Claim:
A process for the preparation of a coating, adhesive, film or sheet wherein a mixture of a polyisocyanate functional, a polyepoxide functional, a polyanhydride functional or a polyketone functional compound or polymer and a dispersion of a compound containing reactive hydrogen, which compound is a polyhydrazide, a polysemicarbazide, or a polysulphonylhydrazide, in a material which contains no groups which are reactive toward the compound containing reactive hydrogen, in which mixture the reactivities of the isocyanate, epoxide, anhydride or the ketone functions towards the hydrazide, semicarbazide, or sulphonylhydrazide is absent or low at ambient conditions and the reactivities are high at temperatures of 50 to 300° C., is applied onto a substrate at ambient temperature, followed by reacting the above compounds at 50 to 300° C. for 1 to 10 min, or is applied onto a substrate at ambient temperature, followed by immersing the coated substrate into water of 20 to 100° C. for 1 to 10 min, so that the mixture cures completely.