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Photoinitiator free inks and method

  • US 4,105,806 A
  • Filed: 11/19/1976
  • Issued: 08/08/1978
  • Est. Priority Date: 11/19/1976
  • Status: Expired due to Term
First Claim
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1. A method for producing a multilayer coating which comprises:

  • 1. applying as a first layer to a substrate a composition comprising at least one epoxide or acrylic material that is normally radiation-curable in the presence of a photoinitiator which releases an active catalyst effective to initiate curing of said material upon exposure to radiation, the composition in said first layer being substantially free of said photoinitiators;

    2. without drying or actively effecting curing of said first layer, applying to said first layer a radiation-curable composition comprising at least one epoxide material cationically polymerizable to a higher molecular weight and a photoinitiator which initiates curing of said material upon exposure to radiation;

    said first layer composition being devoid of components that act to substantially inhibit or retard the action of the photoinitiator in said second layer; and

    3. exposing the coated substrate to irradiation to produce a hardened, multilayered coated substrate.

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