Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1995-02-27
1998-02-24
Caldarola, Glenn
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
430280, 430286, 430287, 430906, 522 75, 522 81, 522 99, 522100, 522104, 522108, 528 26, 528272, 528297, G03F 900, C08F 246, C08G 6302
Patent
active
057210764
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
This invention relates to alkali-developable photosensitive or thermosetting materials for color filter use and to color filters prepared therefrom and also relates to alkali-developable photosensitive or thermosetting resin compositions useful for the preparation of said materials for color filter use and to photochemically or thermally polymerizable unsaturated compounds useful for said resin compositions.
The materials for color filter use can be utilized as inks in the preparation of color filters for a variety of multicolor displays and optical instruments such as color liquid crystal display devices, color facsimile and image sensors. Moreover, color filters prepared from said materials can be utilized as filters for displays such as television, video monitors and computers. In addition to the aforementioned inks for color filters, the resin compositions can be used for protective films on color filters and for solder resists in the preparation of printed circuit boards. The polymerizable unsaturated compounds are used in the preparation of said resin compositions.
BACKGROUND TECHNOLOGY
A conventional color liquid crystal display device constructed of liquid crystals and a color filter as controller of the transmission or reflection of light, the color filter in question is prepared by forming red, green and blue pixels and a black matrix on a glass substrate by dyeing or printing. A color filter prepared by the dyeing process is mainly used where images of a particularly high degree of fineness are required.
According to the dyeing process, a color filter is prepared by forming a black matrix on a glass substrate, applying a photosensitive solution which is prepared by sensitizing natural photosensitive resins such as gelatins or synthetic photosensitive resins such as amine-modified poly(vinyl alcohol) with dichromic acid, exposing through a photomask and developing for patterning or utilizing a masking coat and dyeing with an acid dye and the like. With the dyeing process, however, it is necessary to apply a dye-resisting treatment to those regions which require no coloring in order to prevent the color in the first dyeing from mixing with that in the second dyeing. This treatment complicates the manufacturing process. Moreover, coating films present problems in the reliability of such properties as light resistance, heat resistance and
On the other hand, the printing process uses inks prepared by dispersing pigments in thermosetting resins or ultraviolet-curable resins. In this case, tricolor filter patterns must be aligned precisely during printing. This alignment is difficult to perform and causes problems in fine 62-54,774 (1987) and Sho 63-129,303 (1988)!.
Dispersions of pigments in photosensitive benzyl methacrylate-methacrylic acid copolymers are disclosed in Japan Kokai Tokkyo KohoNo. Hei 1-152,449 (1989). With the use of this type of photosensitive coatings, the films in the exposed region directly constitute a color filter. The photosensitive coatings in question, however, cure insufficiently in the presence of oxygen, which results in lower resolution and sensitivity. It therefore becomes necessary to provide a complicated step for forming an oxygen-barrier film before exposure and stripping it off before development and there is a problem of heat resistance and developing characteristics of the films thus obtained.
As described above, color filters prepared by the conventional printing, dyeing or pigment dispersion process have shortcomings such as low resolution and complicated manufacturing steps.
Screen printing is used extensively for the formation of protective films on color filters and resist patterns on printed circuit boards. This process, however, frequently causes such phenomena as bleeding, smearing or sagging in practice and can no longer cope with recent trend for higher density of devices in printed circuit boards.
Dry-film photoresists and liquid developable resist inks have been proposed to solve these problems. Dry-film photoresists, however, t
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Inada Kohki
Teramoto Takero
Watanabe Kazuhiro
Caldarola Glenn
Nippon Steel Chemical Co. Ltd.
Nippon Steel Corporation
Pasterczyk J.
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