Vapor phase method of coating substrates with polymeric coating

Claim 2

The process of claim 2 wherein the diisocyanate is toluene diisocyanate.

Claim 3

The process of encapsulating individual solid particles in a uniform dense organic polyurea or polyurethane shell comprising suspending said particles in a fluidized bed by directing a stream of inert gas upward through a mass of said particles, introducing into said bed a stream of vapors of a first compound having a plurality of isocyanate groups reactive with the surface of said particles, and simultaneously introducing into a different location in said bed a stream of vapors of a second compound having a plurality of radicals which are highly reactive with said isocyanate groups, said compound being selected from the group consisting of alcohols and amines, said vapor streams being so directed that said particles are circulated throughout the bed in a manner exposing them to the two vapor streams alternately, and continuing the process until a polymeric shell of the desired thickness has been built up on said particles.

Claim 4

The process of providing a shaped substrate with a uniform dense organic polyurea or polyurethane coating comprising placing said substrate in a chamber, introducing into said chamber and in contact with the surface of said substrate to be coated the vapors of a first compound having a plurality of isocyanate groups reactive with said substrate, flushing out the unreacted vapors of said first compound with an inert gas, introducing into said chamber and in contact with the previously treated surface of said substrate the vapors of a second compound having a plurality of radicals which are rapidly reactive with said isocyanate groups, said compound being selected from the group consisting of alcohols and amines, flushing out the unreacted vapors of said second compound with an inert gas, and repeating the cycle until a polymeric coating of the desired thickness has been built up on said substrate.

Claim 5

The process of providing sheet material with a uniform dense organic polyurea or polyurethane coating comprising transporting said sheet material past a plurality of stations where it is repeatedly exposed alternately to (1) the vapors of a first compound having a plurality of isocyanate groups reactive with the surface of said sheet material and (2) the vapors of a second compound having a plurality of radicals which are highly reactive with said isocyanate groups, said compound being selected from the group consisting of alcohols and amines, removing unreacted vapors of each of said compounds before exposing to the vapors of the other of said compounds, and continuing the treatment until a coating of the desired thickness has been built up on said sheet material.

Claim 6

The process of providing a shaped substrate with a uniform dense protective polymeric coating comprising repeatedly alternately exposing said substrate to (1) the vapors of an aromatic diisocyanate and (2) the vapors of a diamine, thereby forming a polymer in situ, and continuing the cycle until a polymeric coating of the desired thickness has been built up.

Claim 7

The process of claim 7 wherein the diamine is ethylene diamine.

Claim 8

The process of claim 7 wherein the diamine is diethylene triamine.

Claim 9

The process of providing a shaped substrate with a uniform dense protective polymeric coating comprising repeatedly alternately exposing said substrate to (1) the vapors of a first compoUnd selected from the group consisting of SiC14 and TiCl4and (2) the vapors of NH4OH, thereby forming a polymer in situ, and continuing the cycle until a polymeric coating of the desired thickness has been built up.