Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1992-11-10
1997-09-02
Chu, John S.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
4302701, 430321, 430324, 205121, 349106, G03F 900
Patent
active
056630190
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing a multicolor display used for multi-coloring display elements such as liquid crystal and the like.
BACKGROUND ART
As a method for forming a conventional color filter, there are various methods. Among them, a noticeable method is that employing electrodeposition. For example, in Japanese Patent Kokai No. 61-272720, there is disclosed a method comprising forming an electroconductive layer on a substrate, forming a positive type photosensitive coating thereon, exposing the coating, removing the exposed part and forming a desired colored layer by electrodeposition. In this method, since the positive type photosensitive coating is formed, only the exposed part is ideally solubilized in a developer, whereby, exposure and development can be repeatedly conducted regarding the remaining photosensitive coating.
However, regarding the positive type photosensitive coating, the part which is not subjected to light is modified by a developer and electrodeposition upon the first development and it becomes impossible to subject the remaining part to exposing and developing treatment again and, therefore, a commercially available quinonediazide can not be used. Accordingly, in this method, it is necessary to provide a peeling step at which all of a positive type photosensitive coating which has been exposed and developed is once peeled off and then the positive type photosensitive coating is formed again, which makes the method complicated.
Further, in Japanese Patent Kokai No. 61-279803, there is also disclosed a method for producing a color filter wherein exposure, development and electrodeposition are repeatedly conducted using a positive type photosensitive composition containing quinonediazide. In this case, quinonediazide is decomposed by heat and, therefore, it can not act as the positive type photosensitive coating after a step for making the second colored layer.
The present invention provides a process for producing a multicolor display by which a color filter having a fine colored pattern superior in thin-film uniformity is obtained by more simple production process.
DISCLOSURE OF THE INVENTION
That is, the present invention provides a process for producing a multicolor display which comprises the following steps: transparent substrate; composition comprising a polymer having a branched group which is unstable to an acid of a tert-butyl ester of a carboxylic acid or a tert-butyl carbonate of a phenol, and a photoinitiator which forms an acid upon exposure, on the transparent electroconductive layer; photosensitive resin layer followed by exposure and development to expose part of the transparent electroconductive layer; electroconductive layer; and
As shown in FIG. 1 (A), a transparent electroconductive layer is firstly formed on a substrate 1. The substrate may be anyone which is normally used for a multicolor display and examples thereof include glass substrate, plastic substrate and the like. As the transparent electroconductive layer, for example, those containing tin oxide, indium oxide, antimony oxide and the like as a main component are suitably used. The transparent electroconductive layer is formed by an art-known method such as deposition, sputtering and the like.
Then, a positive type photosensitive resin layer 3 is formed on the electroconductive layer 2, as shown in FIG. 1 (B). The positive type photosensitive resin layer is a photosensitive resin layer which was once applied and it can be exposed and developed plural times. For example, it is a positive type photosensitive resin composition comprising a polymer having a branched group which is unstable to an acid composed of a tert-butyl ester of a carboxylic acid or a tert-butyl carbonate of a phenol (U.S. Pat. No. 4,491,628 and Japanese Patent Kokai No. 2-309358). In this case, the polymer having a branched group which is unstable to an acid is a polymer or copolymer of a polymerizable compound having a branched group which is unstable to the above acid. As the polyme
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Matsumura et al., Proceeding of Eurodisplay '90 (10. Int. Display Research Conference) 25 Sep. 1990, Amsterdam, pp. 240-243.
Allen, Photopolymerisation and Photoimaging Science and Technology, Chapter 3, p. 99 (1989).
Ishikawa Katsukiyo
Kawakami Atsushi
Matsumura Akira
Ohata Masashi
Chu John S.
Nippon Paint Co. Ltd.
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