Patent ID: 6649311
Filing Date: 2003-11-18
Classification: G03F,Y10T

Abstract:
A process for producing a polymeric layer having a desired image thereon or a three dimensional article comprising a number of such layers, which process comprises curing by light at least one layer of a liquid photocurable composition, which composition comprises a photocurable resin, a first photo initiator, and photo colourable particles dispersed in the composition, and either simultaneously or subsequently irradiating selected areas of said at least one layer with light of a different dose, thereby initiating the photo colourable particles to form the desired image, wherein said photo colourable particles are(a) micro-capsules comprised of a photosensitive colour changing composition and a barrier layer that is substantially impermeable to the components of the colour changing composition; or (b) solid particles comprised of said photosensitive colour changing composition in immobilised form; or (c) solid particles comprised of the micro-capsules of element (a) in immobilised form; wherein the colour changing composition comprises a colour former and a second photo initiator, said first and second photo initiators may be the same or may be different.