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Screen printing of photopolymerizable inks
| Details |
Inventors: Lipson, Melvin A.; Knoth, Dale W.;
Assignee: Dynachem Corporation (Tustin, CA)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Marcus; Stanley A., Bright; Royal E.
Photopolymerizable screen printing inks comprising a hydroxyalkyl acrylate-type monomeric material, a polyester binder and a free-radical initiating system, such inks having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120 and a thixotropic index of from 1 to 4. The process of using such inks to treat substrates, such as in making printed circuits, which includes the steps of screen printing the photopolymerizable ink on the substrate; exposing the ink to actinic radiation to cure the ink and to form a resist; and permanently modifying the exposed areas on the substrate. The resist may thereafter be removed by dissolving in aqueous dilute alkali or an organic solvent. |
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DETAILED DESCRIPTION We claim: 1.
A process for treating a substrate which comprises: A.
Screen printing on the surface of the substrate a solvent free liquid photopolymerizable ink which comprises: (i) 25 to 50% by weight of a photopolymerizable monomeric material containing at least 20 weight percent hydroxyalkyl acrylate or methacrylate; (ii) 20 to 60% by weight of a polyester binder having a molecular weight of from 500 to 50,000; (iii) 5 to 10% by weight of a free radical generating addition polymerizing initiating system; said ink having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120 and a thixotropic index of from 1.
00 to 4.
00; thereby leaving on the surface of said substrate an image corresponding to the image on said silk screen; B.
Exposing the photopolymerizable ink film on said substrate to actinic radiation to cure said ink and to form a resist; C.
Permanently modifying the exposed areas on the substrate which are unprotected by the resist.
2.
The process of claim 1 wherein the substrate is permanently modified by etching.
3.
The process of claim 1 wherein the substrate is permanently modified by electrolese plating.
4.
The process of claim 1 wherein the substrate is permanently modified by electroplating.
5.
The process of claim 1 wherein the substrate is permanently modified by mechanical means.
6.
A process according to claim 1 in which the polyester binder comprises a condensation product of propylene glycol with phthalic anhydride or a mixture of maleic and isophthalic acids.
7.
A process for treating a substrate which comprises: A.
Screen printing on the surface of the substrate a solvent free liquid photopolymerizable ink having a viscosity of from 5,000 to 200,000 centipoises, an acid number of from 0 to 120 and a thixotropic index of from 1.
00 to 4.
00, said ink comprising (i) 25 to 50% by weight of a photopolymerizable monomeric material containing at least 20 weight percent hydroxyalkyl acrylate or methacrylate; (ii) 20 to 60% by weight of a polyester binder having a molecular weight of from 500 to 50,000; (iii) 5 to 10% by weight of a free radical generating addition polymerizing initiating system; thereby leaving on the surface of said substrate an image corresponding to the image on said silk screen; B
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