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
1993-02-02
1994-11-08
Marquis, Melvyn I.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430284, 430306, 525 77, 525 80, 525 82, G03F 7027, G03F 7038
Patent
active
053626044
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water-developable photosensitive resin composition. More specifically, it relates to a photosensitive resin composition having rubbery resilience and comprising a photosensitive microgel having an .alpha., .beta.-ethylenically unsaturated double bond on each gel particle, a compound having an .alpha., .beta.-ethylenically unsaturated double bond and either rubber or a thermoplastic elastomer, and a virgin flexographic printing plate formed therefrom.
TECHNICAL BACKGROUND
In recent years, flexography has been attracting attention with packing being modernized. However, a process for preparing a conventional flexographic printing plate requires at least three steps of (a) preparing a metal plate, (b) molding and (c) vulcanizing rubber. The defects with this process are therefore that it requires skilled workmanship and a long period of time and that the preparation requires a considerably high cost. As a material to overcome these defects, there have been developed printing plates of photosensitive resins developable with a solvent, and a flexographic printing plate can now be simply prepared. Since, however, these printing plates are formed of diene-containing rubbers such as polybutadiene as a base material, it is required to use halogen-containing solvents such as trichlene, perchlene, etc., as a developer in development. Nevertheless, these halogen-containing solvents tend to be limited in use due to an environmental problem and toxicity to human bodies. It has been therefore desired to develop a flexographic printing plate which can be developed with water, free of toxicity to a human body and which has resistance to a water-base ink used for flexography. However, the prior art has found it difficult to satisfy contradicting requirements, i.e., water-developability and resistance to water and alcohol. The present inventor has therefore made a study to apply a microgel obtained by the novel process for producing a photosensitive microgel (JP-A-02-263805), proposed by the present applicant, to a flexographic printing plate. However, it has been hardly possible to obtain a satisfactory one in terms of physical properties such as rubbery resilience.
Further, the present inventor has produced a thick printing plate for flexography by a method of:
(a) repeating casting .fwdarw. drying .fwdarw. casting, or
(b) gradually drying a thick material around room temperature. However, the problem with these methods is that time and labor are extraordinarily required, and that other components and an initiator to be used are limited to water-base ones.
DISCLOSURE OF THE INVENTION
The present invention provides a photosensitive resin composition comprising (1) a photosensitive microgel obtained by emulsion-polymerizing (a) a compound having an .alpha., .beta.-ethylenically unsaturated double bond in the presence, as an emulsifier, of (b) a compound containing a tertiary ammonium salt to prepare (A) fine microgel particles and reacting the (A) fine microgel particles with (B) a compound having an epoxy group to react with the tertiary ammonium salt and at least one .alpha., .beta.-ethylenically unsaturated double bond per molecule, (2) a compound having an .alpha., .beta.-ethylenically unsaturated double bond, and (3) a rubber or thermoplastic elastomer, a process for the production thereof, and a virgin flexographic printing plate produced therefrom.
The present inventor has made a diligent study to develop a photosensitive resin composition which not only has water-developability but also has properties required of a flexographic printing plate. The properties required of a flexographic printing plate include, for example, photosensitivity, resolution, developability, water resistance, isopropyl alcohol resistance, strength.elongation, low rubber hardness.high impact resilience, and the like. As a result, it has been found that the properties required of a flexographic printing plate such as water resistance.alcohol resistance, rubbery resilience, etc., can be s
REFERENCES:
patent: 4753865 (1988-06-01), Fryd et al.
Aylward D.
Marquis Melvyn I.
Toyo Ink Manufacturing Co. Ltd.
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