Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2001-12-04
2004-12-21
Seidleck, James L. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S132000, C522S114000, C522S119000, C522S120000, C522S121000, C522S155000, C522S124000, C522S156000, C522S178000, C522S179000, C522S182000, C522S184000, C522S186000, C522S187000, C430S270100, C430S281100, C430S286100, C430S287100, C430S288100, C427S508000, C427S510000
Reexamination Certificate
active
06833393
ABSTRACT:
BACKGROUND
1. Field of the Invention
The present invention relates to a curable composition capable of forming a cured coating film excellent in abrasion resistance, transparency, anti-fouling property and non-tackiness (release property), a cured coating film formed by such a curable composition and a coated substrate having such a cured coating film.
2. Discussion of Background
A protective film to be formed on the surface of a substrate such as a lens, a display or a photomask, is required have a hard coat property, an anti-fouling property, non-tackiness, etc.
However, heretofore, it used to be required to carry out a hard coat processing to form a hard coating film and an anti-fouling non-tackiness processing to form a coating film having a low surface tension property such as water repellency or oil repellency, separately, in order to form a protective film having the above-mentioned plurality of properties on the surface of a substrate. Accordingly, separate steps are required, thus leading to an increase of costs.
In order to reduce the costs, various attempts have been proposed to form a coating film satisfying the above-mentioned plurality of properties, in a single step. For example, JP-A-10-104403 discloses a sheet having a cured film made of an ultraviolet curable resin and an oligomer containing a fluorine atom-containing alkylalkoxysilane; JP-A-6-211945 discloses a sheet having a cured film made of an alkyl fluoroacrylate and an acrylate not-compatible with an alkyl fluoroacrylate; and JP-A-11-305420 discloses a protective layer for a photomask having a release property from a resist improved.
However, in the case of JP-A-10-104403, the reactivity between the ultraviolet curable resin and the fluorine atom-containing oligomer is poor, whereby there was a problem that the fluorine atom-containing oligomer tends to bleed out as time passes. In the case of JP-A-6-211945, the compatibility of the two materials is poor, whereby there was a problem that a uniform coating film can not be obtained, and it is difficult to obtain a coating film having transparency and good appearance. And, in the case of JP-A-11-305420, a heat curing step is required, whereby there was a problem that the productivity is low.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a curable composition capable of forming, in a single coating step, a cured coating film which has an anti-fouling property and a release property and is excellent in abrasion resistance, whereby such properties will not be deteriorated even when used for a long period of time, a cured coating film formed by such a curable composition, and a coated substrate having such a cured coating film.
The present invention provides a curable composition comprising a compound (A) having at least one active energy ray curable polymerizable functional group, a fluorine-containing copolymer (B) obtained by (1) copolymerizing a polymerizable monomer (a) having a polyfluoroalkyl group and a polymerizable monomer (b) having a photo-curable functional group, or (2) introducing a photo-curable functional group into a fluorine-containing copolymer (D) obtained by copolymerizing a polymerizable monomer (a) having a polyfluoroalkyl group and a polymerizable monomer (d) having a group capable of introducing a photo-curable functional group, and a photopolymerization initiator (C).
In the present invention, the curable composition preferably contains from 0.01 to 20 parts by mass of the fluorine-containing copolymer (B) and from 0.01 to 20 parts by mass of the photopolymerization initiator (C), per 100 parts by mass of the compound (A).
Further, the present invention provides a cured coating film formed by the above curable composition.
Still further, the present invention provides a coated substrate comprising a substrate and such a cured coating film formed on at least one side of the substrate. In this invention, the substrate is preferably a photomask.
According to the present invention, it is possible to provide a curable composition capable of forming, in a single coating step, a cured coating film which has an anti-fouling property and a release property and is excellent in abrasion resistance, whereby such properties will not deteriorate even when used for a long period of time, a cured coating film having the above-mentioned properties, formed by such a curable composition, and a coated substrate having such a cured coating film.
REFERENCES:
patent: 6184339 (2001-02-01), Stansbury et al.
patent: 11-60992 (1999-03-01), None
Ishizeki Kenji
Yamamoto Hirotsugu
Yamamoto Yuichi
Asahi Glass Company Limited
McClendon Sanza L.
Seidleck James L.
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