SU746385A1 - Water soluble polimerasable composition - Google Patents

Description

SB films are copying layer; all components are equally distributed.

COMPOSITIONS. In the absence of benzyl alcohol, the drying process proceeds in such a way that water evaporates last. Only copolyamide dissolves in water, the remaining components do not dissolve (pentaerythritol tetraacrylate, benzoin methyl ester). Thus, these components will be made from an aqueous solution of copolyamide (in the last stage of the process) as separate inclusions of crystals. Consequently, - the uniformity (homogeneity) of the structure of the copy layer will be violated.

The presence of localized blotches of pentaerythritol tetraacrylate and crystals of methyl ester of benzoin reduces the mechanical strength of the copy layer,. In addition, the copying properties of the layer are deteriorating: the edges of the printing elements (lines) are fuzzy (with notches). This, in turn, leads to a decrease in the release capacity, i.e. the ability of the copier layer to produce a well-defined line thickness (the thinner the copier layer can absorb, the better it is).

Example 1. Dissolve 100 weight.h. water-soluble copolyamide in 170 weight.h. ethanol (75%

gacTBOp). In the resulting solution enter the weight.h. triacrylate pentaerythritol, 4 weight.h. M, C-methylenebisacrylamide,), 5 weight.h. methyl benzoate ester and 20 weight.h. benzyl alcohol. After thorough mixing and settling of the solution (until the bubbles completely disappear), the screen is watered and dried. A positive image is copied onto the resulting layer and developed with tap water.

Example 2. 130 parts by weight are dissolved. water-soluble copolyamide in 200 weight.h. ethanol (75% solution). 20 wt.h. Pentaerythritol triacrylate, 15 wt.h. N, N-methylbenzylamine, 2 weight.h. N, N-methyl benzoin ester in 60 weight.h. benzyl alcohol. In the future, proceed as described in example 1.

The copy layer on the basis of the proposed composition has a high resolving and evolving ability, enhanced mechanical strength and run resistance.

Comparative data is given in the table.

Water-soluble copolyamid100 Ethanol (75% solution) Less than 0.3 Pentaerythritol triacrylate 9 N, M-Methylene bisacrylamide 5 Benzoin methyl ester

water soluble copoly .amid100

Ethanol (75% solution)

170

Pentaerythritol triacrylate8 N, N-methylene bisacrylamide 4. Methyl ester of benzoin. 0.5 Benzyl alcohol20 Water-soluble copolyamide 130 Ethanol 200 Pentaerythritol triacrylate-20 Bo S, S-Methylene bisacrylamide 15 Methyl benzoin ester. 2 Benzyl alcohol 60

Claims (1)

More than 50 More than 80 Less than 40 0 More than 50 As can be seen from the table, with the introduction of benzyl alcohol into the photosensitive coil, the resulting copy layer will have greater mechanical strength, as well as increased discharge and resolution capabilities, which significantly improves the quality of stencil printing plates. The claims water soluble fotopolimerizuyuscha a composition for manufacturing screen printing forms, comprising a water-soluble copolyamide triakrypat pentaerythritol, N, N-methylenebisacrylamide, methyl benzoin and ethanol, characterized in that, in order to increase the mechanical strength of the photosensitive D are straight then direct the layer and improving the quality of printed plates, it additionally contains benzyl alcohol following the correlation of components, parts by weight: Water-soluble copolyamide. . 100-130 Pentaerythritol triacrylate, 8-20 N, N-Methylenebisacrylamide 4-15 Methyl benzoin ester 0.5-2.0 Benzyl alcohol 20-60 Ethanol (60-8% aqueous solution) 170-200 Sources of information into account during the examination 1. USSR Copyright Certificate 81014, cl. G 03 S 1/68, 1973 (proip).