Method of Creating an Image in a Photoresist Laminate
A process for creating an image in a dry-film resist laminate. The dry-film resist laminate comprises in order, a peelable top layer, a layer of dry-film resist, a clear or translucent coating layer, and a peelable bottom layer. The top layer is peeled from the laminate and the laminate is applied to a surface using heat and pressure. Thereafter, an image is created in the layer of dry-film resist and the resist is developed to remove uncured portions of the layer of photoresist along with the clear or translucent coating layer.
1 . A process for creating an image comprising the steps of:
(1) providing a dry film resist laminate comprising:
a) a top layer which is removable by peeling it from the laminate;
b) a layer of dry film photoresist on top of the top layer;
c) a clear or translucent coating on top of the dry film photoresist; and
d) a bottom layer on top of the coating, which bottom layer is removable by peeling it from the laminate;
(2) peeling the top layer from the dry film laminate and applying the dry film laminate to a surface using heat and pressure such that the layer of dry film photoresist is adjacent to the surface;
(3) peeling the bottom layer from the dry film laminate such that the coating is left exposed;
(4) creating an image in the layer of dry film photoresist by selectively exposing it to laser radiation such that portions of the layer of dry film photoresist which are exposed to laser radiation are cured but portions which are not exposed to laser radiation remain substantially uncured; and
(5) selectively removing the uncured portions of the layer of dry film photoresist.
2 . The method according to claim 1 , wherein the clear or translucent coating is polyvinyl alcohol.
3 . The method according to claim 1 , wherein the step of removing the uncured portions of the layer of dry film resist also removes the clear or translucent coating.
4 . The method according to claim 1 , wherein the step of selectively removing the uncured portion comprises washing the layer of dry film photoresist with an aqueous alkaline solution to remove the uncured portion.
5 . The method according to claim 1 , wherein the surface comprises a copper clad laminate.
6 . The method according to claim 1 , wherein the top layer comprises a material selected from the group consisting of treated cellulose, paper, polyolefin resins, polyester resins, and polyvinylchloride resins.
7 . The method according to claim 1 , wherein the bottom layer comprises a material selected from the group consisting of treated cellulose, paper, polyolefin resins, polyester resins, and polyvinylchloride resins.
8 . The method according to claim 1 , wherein the laser emits light at a wavelength of between about 350 and about 450 nm.