SU765776A1 - Photopolymeric printing plate - Google Patents

Description

one

The invention relates to photopolymer printing forms and can be used in the printing industry.

A photopolymer printed form is known, consisting of a substrate made of a reinforced fabric and a photopolymerizable layer comprising an oligoester acrylate, a methyl methacrylate crosslinking agent, benzoin, and benzoyl peroxide 1.

The disadvantage of this printing form is that it has low heat resistance and poor adhesion of the photopolymerizable layer to the substrate, which makes it difficult to use such a printing form, for example, as a hot-stamped stamp.

The aim of the invention is to increase the heat resistance of the printing form and the adhesion of the photo-limiting layer to the substrate.

This is achieved by the fact that the substrate of the above printed form is made of aluminum, and the photopolymerisation layer has a copolymer of (methacryloxymethyl) -methylpolysiloxane and phenylpolysiloxane of the formula as a crosslinking agent.

SNC,

) -4-si-o

(I) -Si-O o / 1 5,

where n l-2; m l-3, 10 in the following ratio of components, weight. including:

Oligoether acrylate 100 Copolymer (methacryloxymethyl) -methylpoly15 siloxane and phenylpolysiloxane 80-95 Benzoin 0.5-1.5

Benzoyl peroxide 0.2-2.0. To obtain colored printed forms of 20 forms, the photopolymerizable layer may additionally contain a dye, for example, Bordeaux C in an amount of 0.01-0.03 weight, h.

Example. To prepare 25 compositions, take 100 parts by weight of oligoether acrylate, add 80 parts by weight. copolymer (methacryloxymethyl) -methylpolysiloxane and phenylpolysiloxane of formula (J), 0.5 weight parts benzoin, 0,2ves.ch 30 benzoyl peroxide and mix

at 2 ° C until a homogeneous solution is formed.

For the manufacture of the printing form, the prepared liquid photosensitive composition is poured into the cavity of the forming-copying frame, formed from an aluminum plate, a growth frame and glass on the glued negative. Exposure is performed with LUF-80 lamps from a negative side for 30-40 minutes. At the end of the exposure, the gaps of the printing form are washed with acetone-alcoholic .. mixture, and the form on the substrate is subjected to heat treatment according to the mode: 20-120 ° C (2 h), 120-130 C (3 h).

130-150 "C (2 hours), 150-180 C (2 hours). The composition and physico-mechanical properties of the printing form are given in the table.

Example 2-3. The composition and printing forms thereof are prepared as described in Example 1.

The composition of the photopolymerisation layers of the proposed printing and known forms l3, as well as the properties of the printing forms are tabulated.

As follows from the table above, the proposed printing form has a higher heat resistance and adhesion of the photopolymerizable layer to the substrate.

Claims (2)

Claim 1. Photopolymer printing plate, consisting of a substrate and a photopolymerizable layer, including oligoester acrylate, a crosslinking agent, benzoin and benzoyl peroxide, characterized in that, in order to increase the heat resistance of the printing plate and the adhesion of the photopolymerizable layer to the substrate, the substrate is made of aluminum, and as a crosslinking agent, the photopolymerizing layer contains a copolymer of (methacryloxymethyl) methylpolysiloxane and phenylpolysiloxane of the formula: w in the following ratio of ksmp45 nents, weight ”hours: Oligoeferacrylate 100 A copolymer of (methacryloxymethyl) -methylpolysiloxane and phenylpolysiloxane of formula (I) Benzoin Benzoyl Peroxide 80-95 0.5-1.5 0.2-2.0. 2. Photopolymer printing plate according to Claim 1, wherein (I)> that, in order to obtain a colored printing plate, the photopolymerizable layer additionally contains Bordeaux dye C in an amount of 0.010.03 parts by weight