Inkjet printing of layers
View Patent ↗A layer of material that binds to the next material to be printed is applied. In an embodiment this material is a resin containing a porous silica. The number of printing passes and amount of liquid accumulation is reduced by selecting ingredients of the ink to act both as a humectant and as a layer former, which permits the ink to have high amounts of active ingredient. In an implementation, two materials, the first an ink depositing amine and the second an ink depositing epoxy, are printed separately. They react in situ to form a single, dielectric layer. When the lower layer is a conductive metal trace or a wiring crossover on, for example, a paper substrate, a second metal trace perpendicular to the lower trace may be formed on the dielectric layer to form a capacitive circuit configuration.
1. A method of printing laminations on a substrate by inkjet printing comprising applying a second layer over a first layer on said substrate, subsequently applying by inkjet a first ink layer having an active material to form a film over said second layer, said second layer having a binding characteristic with respect to said active material to hold said active material over said first layer, wherein said first layer is a conductive metal trace and said second layer is a film forming resin containing an acrylic latex binder and porous silica.
2. The method as in claim 1 in which said active material of said first ink layer is a material which polymerizes with another material or catalyzes the polymerization of another material, and also comprising the step of applying by inkjet a second ink layer over said first ink layer having an active material and said active material of said second ink layer is said another material which polymerizes with or polymerizes by catalysis of said active material of said first ink layer.
3. The method of claim 2 in which said active material of said first ink layer is a multifunctional amine and said active material of said second ink layer is a glycidyl.
4. The method of claim 3 in which said glycidyl is a mixture of emulsified multifunctional glycidyl ethers.
5. The method as in claim 2 in which said active material of said first ink layer is at least about 10 percent by weight of the weight of said first ink layer and said active material of said second ink layer is at least about 10 percent by weight of the weight of said second ink layer.
6. The method as in claim 5 in which said active material of said first ink layer is about 20 percent by weight of the weight of said first ink layer and said active material of said second ink layer is about 20 percent by weight of the weight of said second ink layer.
7. The method of claim 5 in which said glycidyl is a mixture of emulsified multifunctional glycidyl ethers.