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
1996-01-24
1999-06-29
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
430306, 430300, 4302811, 4302881, 4302861, 430906, 430911, G03F 7033, G03F 7038, G03F 7037
Patent
active
059167327
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to photosensitive resin compositions for printing plates and, more precisely, to photosensitive resin compositions for printing plates which are developable with water to give printing plates with improved printing durability suitable for flexography.
BACKGROUND ART
A photosensitive resin composition comprising, as a carrier resin component, an elastomer such as a chlorinated rubber, a styrene-butadiene block copolymer, a polyurethane or the like and containing an ethylenic unsaturated compound and a photo-polymerization initiator is useful as a printing plate material for flexography due to the characteristics of the elastomer. Many such compositions have been proposed, for example, in U.S. Pat. Nos. 2,948,611, 3,024,180, Japanese Patent Publication No. 51-43374, etc.
Such solid, photosensitive resin plate materials need to be developed with halogenated hydrocarbons and therefore have problems as causing health injury, environmental pollution, etc. Therefore, the development of solid, photosensitive resin materials for flexographic printing plates is desired. Various proposals for providing solid, photosensitive resin compositions which are developable with water to give printing plates for flexography have been made, for example, in Japanese Patent Publication No. 62-42259, Japanese Patent Laid-Open Application Nos. 61-22339, 63-186232, 5-160451.
However, it is hard for the materials proposed in these to wholly satisfy the raw plate strength and the water developability of printing plate precursors, the flexibility suitable for flexographic printing plates and even the compatibility with aqueous ink which is essentially used in flexography. Therefore, those which are satisfactory for practical use have not yet been obtained. In particular, solid, photosensitive resin materials for flexographic printing plates which can be developed substantially with only neutral water by practical development have not heretofore been obtained.
The present invention has been made in consideration of various drawbacks in such prior art techniques, and its object is to provide photosensitive resin compositions for flexographic printing plates which have high-degree image reproducibility and flexibility suitable for flexography and which have good water developability and good compatibility with aqueous ink.
DESCRIPTION OF THE INVENTION
One photosensitive resin composition for printing plates of the present invention, which is to attain the above-mentioned object, is a photosensitive resin composition for printing plates, comprising the following components A, B-1, C and D: bond(s) in the molecule
Another photosensitive resin composition for printing plates of the present invention is a photosensitive resin composition for printing plates, comprising the following components A, B-2, C and D: bond(s) in the molecule
BEST MODES OF CARRYING OUT THE INVENTION
The term "hydrophilic" which characterizes the component A of the present invention means the property of a polymer of dissolving and/or dispersing in water. For example, the hydrophilic polymer as referred to herein is such that, when a film of the polymer is dipped in water or hot water and rubbed with a brush or the like, all or a part of the polymer dissolves out into the water or the polymer is swollen, broken and dispersed in the water, by which the weight of the film is reduced or the film itself is disintegrated. In view of the object of the present invention, preferably used is a hydrophilic polymer, the 0.5 mm-thick film of which is, when dipped in water at 25.degree. C. for one hour, dissolved or, even if not, it absorbs 200% or more, relative to the polymer, of water to be swollen.
As examples of such a hydrophilic polymer, mentioned are polymers soluble in alcohols and/or water, which include polyamides, partially-saponified polyvinyl acetates, celluloses, etc. In view of the miscibility of the hydrophilic polymer with the component B-1 or B-2 and also with the photo-polymerizable unsaturated compound and
REFERENCES:
patent: 4272608 (1981-06-01), Proskow
patent: 4517279 (1985-05-01), Worns
patent: 5147757 (1992-09-01), Kurtz et al.
patent: 5362604 (1994-11-01), Yatsuyanagi
WPIDS File of Derwent Information LTD.
Encyclopedia of Polymer Science and Engineering vol. 17, pp. 666-698, under "Vulcanization", John Wiley & Sons, Inc, 1989.
Rubber Chemistry and Technology, vol. 55, 116-117 (1982).
Kashio Shigetora
Sasashita Katsutoshi
Tanaka Shinji
Hamilton Cynthia
Miller Austin R.
Toray Industries Inc.
LandOfFree
Photosensitive resin compositions for printing plates and photos does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photosensitive resin compositions for printing plates and photos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photosensitive resin compositions for printing plates and photos will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1374725