SU788067A1 - Photopolymerisable composition for manufacturing printing plates - Google Patents

Description

The invention relates to the field of printing production of photo · polymer printing plates and photosensitive copy layers.

A known photopolymerizable composition for the manufacture of photopolymer printed forms based on cellulose ether containing hydroxypropyl groups, dimethacrylatethylene glycol, benzooy- * 0 la polymerization initiator, solvents of an alcohol-water acetone mixture, and other additives [1).

The specified composition has an insufficiently high photosensitivity, is not stable during long-term storage. 15 The purpose of the invention is to simplify the technology of preparation of the composition. And improve the quality of printing plates.

To achieve this goal, a liquid 20 initiator of butyl-isobutyl benzoin ether is introduced into the composition and all components are taken in the following proportions, Cellulose ether Oligomer Butyl-isobutyl benzoin ether Solvents (mixture) (weight, h):

- fifty

- 100 25

5-15

1500-2500

The photosensitive composition is poured onto a metal plate 30 having a developed surface (grained aluminum), after which it is dried at room temperature, and then the sensed plates are irradiated through photoforms with a LUF-80 lamp battery at a distance of 20 cm.The irradiated plates are exposed to water.

The proposed composition may have the following compositions weight.h:

Example 1 Oxypropylcellulose 40

Oligomer40

Benzoin butyl isobutyl ether 15

Solvents (mixture) 1500

Example 2 Oxylpropylcelluloea50

Oligomer80

Benzoin butyl-isobutyl ether _10

Solvents (mixture) 2000

Example 3 Oxypropylcellulose 50

Oligomer100

Benzoin butyl isobutyl ether 5

Solvents (mixture) 2500

The positive effect of the introduction of the proposal is to improve the compatibility of the components of the composition, simplifying the preparation of the composition.

Printed forms from the proposed compositions are easily manifested by water * are characterized by good ink perception and ink efficiency, high resolution and highlighting ability.

Claims (1)

The invention relates to the field of printing production of photopolymerno printing plates and photosensitive copy layers. Known photopolymerizable composition for the manufacture of photopolymer printing plates based on cellulose ether containing hydroxypropyl groups, dimethacrylate ethylene glycol, benzoyl polymerization initiator, alcohol-water-acetone mixture solvents and other additives 1. This composition has insufficient dosimeter, is not stable. storage The purpose of the invention is to simplify the technology of preparation of the substrate. and improve the quality of printing forms. To achieve this goal, a liquid initiator benzoin butyl-isobutyl ether is introduced into the composition and all components are taken in the following ratios, (weighed) Cellulose ether 40-50 Oligomer30-100 Benzoin butyl isobutyl ether 5-15 Solvents (mixture) 1500- 2500 The photosensitive composition is poured onto a metal plate having a developed surface (granulated aluminum), after which it is dried at room temperature and then sensitive plates are irradiated through photoforms with a battery of LUF-80 n lamps. distance of 20 cm. The irradiated plate exhibit water. The proposed x-position can have the following compositions by weight: Example 1 Hydroxypropylcellulose Oligomer Benzoin Butyl-isobutyl ester Solvents (mixture) Example 2 Oxylpropylcellulose Oligomer Benzoin Butyl-isobutyl ether. Solvents (Blend) Example 3 Hydroxypropylcellulose Oligomer Benzoin Butyl Isobutyl Ester Solvents (Blend) The positive effect of introducing the proposal is to improve 3}. 78806 of the compatibility of the components of the composition for the preparation of the composition. The printed of the proposed compositions are easily manifested by water. They are characterized by good color perception and paint performance, high resolution and remarkable ability. The invention is a PHOTOPOLYMERIZING composition for the manufacture of printing forms, consisting of cellulose ether, oligomer. photopolymerization initiator, and solvents, characterized in that, in order to simplify the preparation of the composition 7.4 and improve the quality of the printing form, bentoin vutyl-isobutyl ether is used as the photopolymerization initiator in the following ratio of components, parts by weight .. cellulose 40-50 Oligomer30 - 100 Benzoin 5-15 butyl-isobutyl ether benzoin 5–15 RNRWNDFLNG (gme g 1CHPP-9 PP Solvents (mixture) 1500 2500 Sources of information taken into account during the examination of j. USSR author's certificate No. 450128, G 03 From 1/68, 1975.