Unlock instant, AI-driven research and patent intelligence for your innovation.

Photosensitive resin composition and resin plate for flexography

a technology of which is applied in the field of photosensitive resin composition and resin plate for flexography, can solve the problems of not being able to be extracted with water or aqueous solvent, being highly toxic to the human body, and being unfavorable from the viewpoint of the working environmen

Inactive Publication Date: 2001-10-25
TOKYO OHKA KOGYO CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The composition achieves high sensitivity, impact resilience, and extended press life, making it suitable for printing thick materials while being environmentally friendly by eliminating the need for toxic solvents.

Problems solved by technology

However, these thermoplastic elastomers are hydrophobic, so that they can not be extracted with water or aqueous solvents.
However, they are highly toxic to the human body, which not only raises a problem with regard to hygiene, but also are unfavorable from the viewpoint of working environment.
However, they are low in impact resilience, so that they are unsuitable as materials for printing plates for printing thick printing materials such as corrugated fiberboards.
Moreover, they have the disadvantage that water-color ink can not be used.
However, it has the problems that a hardened portion forming a line pattern portion of a printing plate material is poor in water resistance, that the ink resistance is low, and moreover that the press life is also poor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

production example 1

[0043] In a four-neck flask equipped with a stirrer, a thermometer, a condenser, a dropping funnel and a nitrogen gas-introducing pipe, 100 parts by weight of methyl ethyl ketone was placed, and the temperature thereof was raised to 75.degree. C. Then, 2.5 parts by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto while blowing nitrogen gas therein. Subsequently, a previously prepared monomer mixture consisting of 5.1 parts by weight of acrylic acid, 54.8 parts by weight of methyl methacrylate and 40.1 parts by weight of ethyl acrylate was added dropwise for 2 hours. The temperature in the flask during dropping was maintained at the reflux temperature of methyl ethyl ketone. After termination of dropping, the temperature was maintained at the same temperature for 2 hours. Then, 5 parts by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto, and the resulting so...

production example 2

[0044] In a four-neck flask equipped with a stirrer, a thermometer, a condenser, a dropping funnel and a nitrogen gas-introducing pipe, 100 parts by weight of methyl ethyl ketone was placed, and the temperature thereof was raised to 75.degree. C. Then, 6.25 parts by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto while blowing nitrogen gas therein. Subsequently, a previously prepared monomer mixture consisting of 11.5 parts by weight of acrylic acid, 62.4 parts by weight of methyl methacrylate and 26.1 parts by weight of ethyl acrylate was added dropwise for 2 hours. The temperature in the flask during dropping was maintained at the reflux temperature of methyl ethyl ketone. After termination of dropping, the temperature was maintained at the same temperature for 2 hours. Then, 5 parts by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto, and the resulting ...

production example 3

[0045] In a four-neck flask equipped with a stirrer, a thermometer, a condenser, a dropping funnel and a nitrogen gas-introducing pipe, 100 parts by weight of methyl ethyl ketone was placed, and the temperature thereof was raised to 75.degree. C. Then, 1 part by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto while blowing nitrogen gas therein. Subsequently, a previously prepared monomer mixture consisting of 13.5 parts by weight of acrylic acid, 83.8 parts by weight of methyl methacrylate and 2.7 parts by weight of ethyl acrylate was added dropwise for 2 hours. The temperature in the flask during dropping was maintained at the reflux temperature of methyl ethyl ketone. After termination of dropping, the temperature was maintained at the same temperature for 2 hours. Then, 5 parts by weight of a methyl ethyl ketone solution containing 20 wt % of azobis-2-methylbutyronitrile was poured thereinto, and the resulting solut...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
acid valueaaaaaaaaaa
acid valueaaaaaaaaaa
Login to View More

Abstract

The present invention provides a photosensitive resin composition which comprises an urethane resin obtained by reacting (A) a carboxyl group-containing polymer having an acid value of 30 mg KOH / g or more and a glass transition temperature of 30° C. or more, (B) a compound having two isocyanate groups in one molecule, (C) a compound having two hydroxyl groups in one molecule and (D) a photopolymerizable unsaturated monomer having one hydroxyl group in one molecule, and a photopolymerization initiator, and a resin plate for flexography using the photosensitive resin composition, whereby the photosensitive resin composition having water developing properties, high in sensitivity and impact resilience, and excellent in water resistance, ink resistance and press life of a hardened portion forming a line pattern area of a printing plate material and the resin plate for flexography prepared by the use of the photosensitive resin composition can be provided.

Description

[0001] The present invention relates to a photosensitive resin composition, and more particularly to a photosensitive resin composition suitable for a plate for aqueous flexography and a resin plate for flexography using the photosensitive resin composition.TECHNICAL BACKGROUND[0002] Conventionally, thermoplastic elastomers having appropriate impact resilience or photosensitive resin compositions comprising photopolymerizable unsaturated monomers and photopolymerization initiators have been used as photosensitive resin compositions for forming photosensitive resin layers of photosensitive resin plates for flexography. As the above-mentioned thermoplastic elastomers, for example, styrenic resins such as styrene / isoprene / styrene and styrene / butadiene / styrene have been used. However, these thermoplastic elastomers are hydrophobic, so that they can not be extracted with water or aqueous solvents. Accordingly, chlorine series organic solvents such as chloroform, trichloroethane, trichlor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C08G18/40C08G18/67C08G18/81G03F7/035G03F7/038
CPCC08G18/4018C08G18/67C08G18/672C08G18/8175G03F7/035G03F7/0388G03F7/028
Inventor TAKAGI, TOSHIYAKAHARA, KOJIAOYAMA, TOSHIMIKOBAYASHI, NOBUHIROYOSHIDA, MASATOSHI
Owner TOKYO OHKA KOGYO CO LTD