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
1997-04-14
1998-11-03
Hamilton, Cynthia
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
4302881, 4302861, 430910, 430907, 522110, 522121, G03F 7033
Patent
active
058306218
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a photosensitive rubber plate and a photosensitive elastomer composition. More particularly, the present invention relates to a photosensitive rubber plate which is high in strength balance and image reproducibility, as well as to a photosensitive elastomer composition used for obtaining the rubber plate.
BACKGROUND ART
Flexographic printing plates are produced by tightly fitting a negative film onto a photosensitive plate, applying an actinic ray thereto to expose part of the photosensitive layer of the plate to the ray, and washing and removing the unexposed portion of the photosensitive layer to form a relief.
The material for a photosensitive layer of a photosensitive rubber plate such as used in a flexographic printing plate is required to have excellent balance in strengths such as tensile strength, elongation and the like when made into a plate and be able to give, after light exposure and washing, a relief of narrow convex fine line and deep reverse fine line, i.e. a relief of high image reproducibility.
As the material for a photosensitive layer, there are known photosensitive elastomer compositions comprising, as essential components, an elastomer, a photopolymerizable ethylenically unsaturated monomer and a photopolymerization initiator. In order for the photosensitive elastomer compositions to be uniform, it has been a requisite that the photopolymerizable ethylenically unsaturated monomer has high compatibility with the elastomer. As specific examples of the monomer, there are known polyalkylene glycol diacrylates such as polyethylene glycol diacrylate and the like, and corresponding dimethacrylates; and polyester monomers each composed of a hydrocarbon polyalcohol of 6 or less carbon atoms and (meth)acrylic acid, such as 1,6-hexanediol diacrylate and the like.
Rubber plates using these photosensitive elastomer compositions, however, were low in strength and insufficient in image reproducibility.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a photosensitive rubber plate which is high in strength balance and image reproducibility, and a photosensitive elastomer composition used for obtaining the rubber plate.
The present inventors made a study in order to achieve the above object. As a result, the present inventors found out that the above object can be achieved by using a photosensitive elastomer composition comprising a particular photopolymerizable ethylenically unsaturated monomer. The present invention has been completed based on the finding.
According to the present invention, there is provided a photosensitive elastomer composition comprising: unsaturated acid and a C.sub.7-14 straight chain hydrocarbon polyol, and
According to the present invention, there is also provided a photosensitive rubber plate of laminated structure comprising a substrate and a layer of the above photosensitive elastomer composition formed on the main surface of the substrate.
BEST MODE FOR CARRYING OUT THE INVENTION
The photosensitive elastomer composition of the present invention comprises an ester monomer composed of an ethylenically unsaturated acid and a polyol, an elastomer and a photopolymerization initiator.
The ester monomer composed of an ethylenically unsaturated acid and a polyol, which is a component of the present composition, is formed by ester bonding of an ethylenically unsaturated acid and a polyol and gives rise to a polymerization reaction in the presence of a photopolymerization initiator.
The polyol is such a polyol that at least two hydrogen atoms of a C.sub.7-14, preferably C.sub.8-12 straight chain hydrocarbon are replaced by hydroxyl groups. When the polyol has carbon atoms less than 7, the strength of the resulting photosensitive rubber plate is insufficient. When the polyol has carbon atoms more than 14, dispersion of ester monomer in elastomer is not uniform and the resulting photosensitive elastomer composition has nonuniform photosensitivity; therefore, the strength and image reproducibility
REFERENCES:
patent: 4192684 (1980-03-01), Gensho et al.
patent: 4195997 (1980-04-01), Graham
patent: 4272608 (1981-06-01), Proskow
patent: 4323636 (1982-04-01), Chen
patent: 4758500 (1988-07-01), Schober et al.
patent: 5472824 (1995-12-01), Schober et al.
Sakurai Fusayoshi
Shibuya Tomohiro
Suzuki Takao
Ueno Haruo
Hamilton Cynthia
Nippon Zeon Co. Ltd.
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