Thermally transferable layers of radiation sensitive epoxy resins used to prepare protective coatings and relief images
AssigneeCiba-Geigy Corporation
InventorsHans Zweifel, Sigrid Bauer, Kurt Meier
Life of this patent
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Abstract
A process for the production of a protective layer or a relief image on a substrate, wherein a radiation-sensitive layer, consisting of a solid film-forming epoxy resin containing a photoinitiator, which can be activated by radiation, for the polyaddition reaction, is transferred from a support to a substrate, then exposed directly or under a photomask and hardened by the action of heat, after which, if appropriate, the unexposed parts are developed with a solvent. The process is suitable, for example, for the production of printed circuits, solder resist masks and offset printing plates.
Claims20
A process for the production of a protective layer on a substrate which comprises
- thermally transferring, by the application of pressure and heat at a temperature of up to 150.degree. C., a radiation-sensitive layer from support to the substrate, which layer consists essentially of
- (a) a solid film-forming epoxy resin,
- (b) 0.1 to 15% by weight, based on the epoxy resin, of a cationic photoinitiator;
- and
- (c) 0 to 10% by weight, based on the epoxy resin, of a photo sensitizer,
- exposing directly said layer to radiation by an electron beam or actinic light, and then
- heating the layer after irradiation to harden said layer.
A process for the production of a relief image on a substrate which comprises
- thermally transferring, by the application of pressure and heat at a temperature of up to 150.degree. C., a radiation-sensitive layer from a support to the substrate, which layer consists essentially of
- (a) a solid film-forming epoxy resin,
- (b) 0.1 to 15% by weight, based on the epoxy resin, of a cationic photoinitiator, and
- (c) 0 to 10% by weight, based on the epoxy resin, of a photo sensitizer,
- exposing said layer through a photomask to radiation by an electron beam or actinic light,
- heating the layer after irradiation to harden the radiation-exposed parts of said layer, and then
- developing the relief image with an organic solvent.
Dependencies are inferred from the claim text.