SU1412491A1 - Photopolymerizing composition for making elastic photopolymer printing plates - Google Patents

Abstract

The invention relates to chemical-photographic materials, in particular, a photopolymerizable composition (FPC) for the manufacture of elastic printing forms. The composition of the FPC includes, in wt.%: An isoprene styrene block copolymer containing 20% polystyrene blocks (mol. M 12,000) 17,843-19,21; dimethylamine-acrylic ester of methacrylic acid 1.85-5.55; 2,2-dimethoxy-2-phenylacetophenone 0.072-0, X) 82; ionol 0.007- 0.008; trichlorethylene else. This FPC allows increasing the depth of photochemical crosslinking of photopolymer printing plates to 95% and reducing the degree of their swelling in organic solvents (10.6–11.7% versus 19.7%). 1 tab. with (L

Description

The invention relates to the creation of a photopolymerized composition and can be used for the manufacture of flexible photopolymer printing. forms for flexographic printing in printing - The purpose of the invention is to increase the depth of photochemical crosslinking of photopolymer printing forms j0 (FPF) and reduce the degree of their pouches in organic solvents

The invention is illustrated by the following examples. The compositions of the compositions and the results of their tests are shown in the table fj.

PRI me R 1. 50 g (18.50 wt.%) Isoprene styrene block copolymer

(TU 38-103392-83), containing 20 May% of styrene blocks, dissolved in 200 g of 20 (74j02 wt.%) Trichloroethylene (TCE) for 2-3 hours at room temperature, then with heating to AO-50 C. a homogenized solution was added 5 g (1585 wt.%) of dimethacrylic ester 5 of ethylene glycol (DMEG) and 15 g (5.55 wt.%) of yloxyethyl methacrylic acid, 0.2 g (0.0730 May L) 2, 2-dimethoxy-2-fekilatvofenon9 0.02 g (0.007 wt.%) Ionol. The obtained jg mixture is stirred for 30 minutes. It is filtered through a nylon cloth and; deaerated at 5-6 hours

The photosensitive film is obtained by multiple shots by irrigating the surface of a rotating drum. The speed of rotation of the cylinder and the height of the lifting of the spinneret are determined by the viscosity of the composition. The thickness of the dried film.

(500-3000) +25 μm40

For the manufacture of FPP, a skimmed azanum backing layer is coated with a solution of SKU-8 urethane rubber solution in ethyl acetate containing 10 wt% polyanthiocyanate. After drying the adhesive, the photosensitive layer and the lavsan substrate duplicate between the rollers at a pressure of 2 kgf / cm. FPFs were exposed to LUF-8b lamps at a distance of 60 mm through a negative test. The time of occurrence in a mixture of trichlorethylene 5 and ethyl acetate (Is7) in a nozzle machine at a pressure of kgf / cm and a temperature of 30–3.3 o is 2–3 min.

45

where P is the initial mass of the sample;

P is the mass of the sample after the introduction of chloroform.

The resistance of the FPP to the action of polar solvents used to prepare flexographic inks is determined by the degree of swelling according to the method (GOST 9.030-7A).

The data in the table indicate that with the introduction of methacrylic acid vinyloxyethyl ester into the FPC, the depth of photochemical crosslinking t increases in comparison with the prototype, and the degree of swelling in the solvent mixture: I - ethyl alcohol-ethyl acetate (1s1), II - ethyl alcohol - butyl acetate (111) decreases accordingly. The use of methacrylic acid and DMEG in the inyloxyethyl ester in the composition of the proposed composition in quantities greater than 5.55 wt.% Or less than 1.85% by weight leads to a decrease in the degree of FPP swelling in organic solvents, to an insignificant increase ; combining FPP and decreasing the Pg value (comparative examples 6-9). .

Claims (1)

Invention Formula A photopolymerizing composition for the manufacture of elastic photopolymer printing plates, including a base copolymer containing 20% of polystyrene blocks with a mol, m. 12,000, ethylene glycol dimethacrylate, photoinitiator-2,2-di-methoxy-2-phenylacetophenone, thermomer - bilizator - ionol, organic solvent - trichlorethylene, in order to increase the depth of photochemical crosslinking of photopolymer printing plates to reduce the degree of swelling in organic solvents, it additionally contains t Vinyloxyethyl ester of methacrylic acid formiculi, moules I The depth of the photokhi (icical transformations in the FPP was estimated by the gel- fraction method using the formula R, / R, P00%, S5 cH3 cH-o-cHj, -cHj-o-9-c; cHj Oh CH, in the following ratio, wt.%: Isoprenstyrene block copolymer containing 20% polystyrene blocks with tfon. 12,000 dimethacrylate ethylene glycol . PJ is resolution, Bj is resolution.  4l2 / .91 Methacrylic acid vinloxyethyl ester of the formula I 2,2-Dimethoxy-2-phenylacetophenone Ionol Trichlorethylene 1.85-5.55 0.072-0.082 0,007-0,008 Rest