Process for producing display element, pattern sheet therefor, and process for producing pattern sheet

A process for producing a patterned display element which comprises the steps of:

• exposing both sides of a peel-off developable pattern-forming sheet, which comprises a photopolymerizable color image-forming material layer having on both sides thereof transparent flexible substrates, to light through a pair of photomasks being placed on each side of said pattern-forming sheets, a first photomask of said pair of photomasks having a first light-transmitting pattern that corresponds to the light-shielding portions of a second mask and a light-shielding pattern of the first mask that corresponds to light-transmitting portions of the second mask, to thereby cure a surface layer of each side of said color image-forming material layer in the parts corresponding to said light-transmitting patterns of said photomasks;
• peeling off one of said flexible substrates;
• adhering said pattern-forming sheet to a transparent adhered through the exposed surface of said color image-forming material layer;
• exposing said color image-forming material layer to light from the side of said adherent to cure the uncured parts of said color image-forming material layer on the side in contact with said adherend and to fix the thus cured parts on said adherend;
• and
• peeling off the remaining flexible substrate from said adherent together with said color image-forming material layer remaining uncured,
• wherein the photopolymerizable color image-forming material layer contains a colorant having weather resistant properties and is capable of endowing a photocured product of the color image forming material layer with a hiding power of 2.5 or more as measured by a transmission densitometer.

A process for producing a peel-off developable pattern sheet comprising a transparent flexible substrate having thereon a pattern comprising a photopolymerizable color image-forming material layer,

• said process comprising the steps of:
• adhering a peel-off developable pattern-forming sheet comprising a transparent flexible substrate having thereon a photopolymerizable color image-forming material layer to an adherend through said color image-forming material layer;
• exposing the flexible substrate side of said pattern-forming sheet to light through a photomask having a light-shielding pattern;
• and
• peeling off said pattern-forming sheet from said adherent while leaving and fixing a pattern comprising the unexposed parts of said color image-forming material layer remaining on said flexible substrate,
• wherein the photopolymerizable color image-forming material layer contains a colorant having weather resistant properties and is capable of endowing a photocured product of the color image forming material layer with a hiding power of 2.5 or more as measured by a transmission densitometer.

A process for producing a patterned display element which comprises the steps of:

• adhering a peel-off developable pattern sheet comprising a transparent flexible substrate having thereon a pattern comprising a photopolymerizable color image-forming material layer onto an adherend through said pattern;
• exposing said pattern sheet to light;
• and
• peeling off said pattern sheet while leaving and fixing a color pattern comprising the thus photocured color image-forming material layer on said adherend,
• wherein the photopolymerizable color image-forming material layer contains a colorant having weather resistant properties and is capable of endowing a photocured product of the color image forming material layer with a hiding power of 2.5 or more as measured by a transmission densitometer.

A process for forming a patterned display element having a multi-color pattern which comprises the steps of:

• adhering a peel-off developable pattern sheet comprising a transparent flexible substrate having thereon a pattern comprising a photopolymerizable color image-forming material layer onto an adherend through said pattern;
• exposing said pattern sheet to light;
• peeling off said pattern sheet while leaving and fixing a color pattern comprising the photocured color image-forming material layer on said adherend to complete one cycle;
• and
• repeating said cycle using a combination of a plurality of pattern sheets each having a prescribed pattern different in color, wherein the photopolymerizable color image-forming material layer contains a colorant having weather resistant properties and is capable of endowing a photocured product of the color image forming material layer with a hiding power of 2.5 or more as measured by a transmission densitometer.