Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Reexamination Certificate
2001-11-27
2003-11-04
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
C430S270100
Reexamination Certificate
active
06641961
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a colored photosensitive composition.
2. Description of Related Art
Colored photosensitive compositions, which are photosensitive compositions colored with a colorant, are useful as materials for forming color pixels constituting a color filter in color liquid crystal displays, color solid camera and the like, or black matrices. Conventionally known compositions contain a colorant(A), a binder polymer (B), a photo-polymerizable compound (C) and a photo-polymerization initiator (D).
For making color pixels or the like with these colored photosensitive compositions, for example, a colored photosensitive composition layer (
1
) is formed on a substrate (
2
) (see FIG.
1
(
a
)), said layer (
1
) is exposed to light by irradiating a light beam (
4
) through a photo-mask (
3
) (see FIG.
1
(
b
)) and then a development is conducted. By the development, a non-irradiated area (
11
), which is an area of the colored photosensitive composition layer (
1
) having not irradiated with the light beam (
4
), is removed, while an irradiated area (
12
), which is an area having irradiated with the light beam, is remained. Thus a color pixel or a black matrix (
5
) is formed (see FIG.
1
(
c
)). The color pixel or the black matrix (
5
) formed in this manner is usually hardened by heat treatment after development in order to increase the mechanical strength.
It is desirable that the color pixel or the black matrix (
5
) has a thin thickness and is rectangular (see FIG.
2
(
a
)) or forward-tapered (see FIG.
2
(
b
)) in cross section. In order to form a sufficiently colored color pixel or the like (
5
) in spite of a thin thickness, the concentration of the colorant (A) contained in the colored photosensitive composition should be high.
Since, however, when, in a conventional colored photosensitive composition, the concentration of the colorant (A) is increased in order to form a color pixel or the like having a thin thickness, the obtained color pixel or the black matrix (
5
) tends to become reverse-tapered in cross section (see FIG.
2
(
c
)).
The inventors have conducted extensive studies for developing a colored photosensitive composition that enables production of a color pixel or a black matrix having a rectangular or forward-tapered cross section even when the colorant is contained in a high concentration. As the result, they have found that the cross section of the obtained color pixel or the like could be a rectangular or forward-tapered cross section by adding a chain transfer agent (E), even when the colorant is contained in a high concentration. The present invention has been completed based on such finding.
SUMMARY OF THE INVENTION
The present invention provides a colored photosensitive composition comprising a colorant (A), a binder polymer (B), a photo-polymerizable compound (C), a photo-polymerization initiator (D) and a chain transfer agent (E).
REFERENCES:
patent: 5792589 (1998-08-01), Udagawa et al.
patent: 5866298 (1999-02-01), Iwamoto et al.
patent: A 8-123016 (1996-05-01), None
patent: A 9-208611 (1997-08-01), None
Birch & Stewart Kolasch & Birch, LLP
McPherson John A.
Sumitomo Chemical Company Limited
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