Photoinitiator free inks and method
First Claim
Patent Images
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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Abstract
Photoinitiator-free inks and a method of producing printed and varnished surfaces are provided by depositing a base film or printing on a substrate and depositing, wet-on-wet, a protective varnish or top coat after which the multilayers are exposed to an energy source, preferably to electromagnetic radiation, to simultaneously cure the varnish and ink on said substrate.
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Citations
21 Claims
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1. A method for producing a multilayer coating which comprises:
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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; and3. exposing the coated substrate to irradiation to produce a hardened, multilayered coated substrate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for producing a multilayered coating which comprises:
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1. applying as a first layer to a substrate a composition comprising at least one epoxide material that is normally radiation-curable in the presence of a photoinitiator which releases an active catalyst effective to initiate cationic curing of said epoxide upon exposure to radiation, the composition in said first layer being substantially free of photoinitiator; 2. without drying or actively effecting curing of said first layer, applying to said first layer a radiation-curable composition comprising at least one acrylic material polymerizable to higher molecular weights through ethylenic unsaturation and a photoinitiator which initiates curing of said material upon exposure to radiation;
said first layer being devoid of components that act to substantially inhibit the action of the photoinitiator in said second layer.3. exposing the printed, varnished substrate to irradiation to produce a hardened, abrasion-resistant multi-layered coated substrate. - View Dependent Claims (8, 9)
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- 10. A method for producing a printed and varnished substrate which comprises:
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11. applying to a substrate an essentially solventless radiation-curable photoinitiator-free acrylic ink composition comprising at least one polymerizable material having ethylenic unsaturation;
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2. applying to the wet ink a fluid, essentially solventless epoxy varnish comprising an epoxide material and a photoinitiator effective to initiate polymerization of said epoxide material upon exposure to radiation;
said acrylic ink being devoid of components that substantially inhibit or retard the action of the photoinitiator in the epoxy varnish;3. exposing the printed, varnished substrate to irradiation to produce a hardened, abrasion-resistant printed and varnished substrate.
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14. A method for producing a printed and varnished substrate which comprises:
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1. applying to a substrate an essentially solventless radiation-curable photoinitiator free epoxy ink composition comprising at least one polymerizable epoxide material; 2. applying to the wet ink a fluid, essentially solventless epoxy varnish comprising at least one polymerizable epoxide material and a photoinitiator effective to initiate polymerization of said epoxide material upon exposure to radiation;
said epoxide ink being devoid of components that substantially inhibit or retard the action of the photoinitiator in the epoxy varnish;3. exposing the printed, varnished substrate to irradiation to produce a hardened, abrasion-resistant printed and varnished substrate. - View Dependent Claims (16, 18, 19, 20, 21)
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17. A method for producing a printed and varnished substrate which comprises:
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1. applying to a substrate an essentially solventless radiation-curable photoinitiator-free epoxy ink composition comprising at least one polymerizable epoxide material; 2. applying to the wet ink a fluid, acrylic varnish composition comprising at least one polymerizable acrylic material having ethylenic unsaturation and a photoinitiator therefor effective to initiate polymerization of said acrylic material upon exposure to radiation; 3. exposing the printed, varnished substrate to radiation to produce a hardened, abrasion-resistant, printed and varnished substrate.
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Specification