Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1992-03-20
2000-02-29
Dote, Janis L.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
4302811, 4302861, 4302871, 430292, 430338, 430346, 430923, 522 78, G03C 176, G03F 7105, G03F 711
Patent
active
060307498
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a photosensitive resin composition and a photosensitive element structure comprising the photosensitive resin composition. More particularly, the present invention is concerned with a photosensitive resin composition containing an anthraquinone dye capable of exhibiting a color change to produce a fresh color upon being irradiated with an ultraviolet ray of a wavelength in a specific range and of a quantity larger than a threshold value in the presence of a radical producer, and a photosensitive element structure comprising the composition. The photosensitive resin composition of the present invention is capable of exhibiting a color change to produce a fresh color upon being irradiated with an ultraviolet ray of a wavelength in a specific range which ray is irradiated in a quantity of larger than a threshold value in order to form an image and, hence, can advantageously be used for producing a photocured resin product, such as a printing plate and a resist, in which an image portion corresponding to an imagewise-exposed portion has a color which is different from the color of a non-image portion corresponding to an unexposed portion. For example, in a printing plate produced from the photosensitive resin composition of the present invention, the relief portion (image portion) has a color which is different from the color of the non-image portion, to thereby provide a good contrast between the image portion and the non-image portion. Therefore, especially, the photosensitive resin composition of the present invention can advantageously be used for obtaining a flexographic printing plate which is greatly improved in working efficiency and accuracy for positioning, when the printing plate is mounted onto the cylinder of a printing machine.
BACKGROUND ART
Conventionally, a rubber plate for use in flexographic printing has been produced by etching a metallic plate to produce an original plate, preparing a matrix plate from, e.g., a plastic by using the original plate, and pouring a rubber into the matrix plate, followed by pressing. However, this method has drawbacks in that numerous steps are needed, thus requiring too great a cost and too much time. In addition, this method also has drawbacks in that the produced rubber plate itself is low in thickness precision and, hence, it is necessary to raise the thickness precision by shaving the back side of the plate before use.
In order to solve this problem, there has recently been proposed a method of producing a flexographic printing plate directly from a photosensitive resin composition. According to this method, not only can the step for the above-mentioned shaving of the back side of the plate be eliminated, but also it is possible to obtain a printing plate capable of printing a pattern which is fine, as compared to a pattern which can be printed by the conventional rubber plate.
The production of a printing plate from such a photosensitive resin composition is performed by irradiating a photosensitive resin composition with actinic rays through a negative mask having a predetermined transparent pattern to thereby photocure only the resin portion exposed to rays in accordance with the transparent pattern, and then washing out the non-exposed portion with a developer, thereby forming a "relief portion" corresponding to the exposed portion and a "non-image portion" corresponding to the non-exposed portion. The thus formed relief portion is utilized as a relief of a printing plate.
A printing plate produced from a photosensitive resin composition, which plate is used in multicolor printing in many cases, has a disadvantage in that since the relief is transparent, the relief surface is difficult to distinguish, so that it is difficult to properly position a printing plate each time a printing plate is mounted onto the cylinder of a printing machine for printing an individual color.
As a method for alleviating this drawback, it is conceivable to simply color the photosensitive resin composition. By this method,
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Asahi Kasei Kogyo Kabushiki Kaisha
Dote Janis L.
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