SU367404A1 - PHOTO-POLYMERIZED COMPOSITION FOR PRINTED FORM-DUBLICATES - Google Patents

Description

one

The invention relates to the technology of manufacturing printing forms for letterpress and other relief images and can be used in the printing industry and other branches of the national economy.

A photopolymerizable composition comprising polymethyl methacrylate dissolved in methyl methacrylate, an initiator and a polymerization accelerator is known to be used to produce a plastic electro-base.

However, this method is laborious due to the need to obtain galvanic deposition, does not provide reliable bonding of the vile deposit with a plastic base, requires the use of special adhesive bonding, toxic, requires the use of sophisticated equipment. In addition, such electro-types are characterized by increased rigidity and require the use of special equipment to bend them when used in rotary printing.

The purpose of the invention is to develop a method of manufacturing printing plates duplicates without the use of special complex equipment that provides high quality printing plates and high replicability.

To do this, a photopolymerizable composition based on acrylic monomers is used, including polymerization oligomers, a sensitizer, dyes, high molecular weight and inorganic fillers.

As oligomers, oligomethyl ethers are used, benzoin is used as a sensitizer.

In order to increase the hydrophobicity, silicone fluid is introduced into the composition.

The invention provides for the possibility of introducing into the composition as inorganic fillers. Aerosol, fiberglass, aluminum powder, and as polymeric fillers - polyamide resin, polyurethane, epoxy resins, polyvinyl butyral. Eosin is used as a dye.

Depending on the purpose of stereotypes according to the types of printed products, the composition is poured directly into the matrix (cardboard, vinyl plastic from Plexiglas, thermo-reactivity, etc.), covered with a depth point of printing elements by a separating layer, for example, from an aqueous solution of polyvinyl alcohol, a wax compound,

diopersnite graphite in methyl ethyl ketone, organic organic anti-adhesive fluids or other or not covered with a separating layer.

Example 1. A composition of the following composition was prepared, wt. including:

Oligoether acrylate methacrylate diethylene glycol phthalate (type MDF-2) 1000 Methyl methacrylate100-200 Aerosil -20-30 Benzoin7.5-15 Silicon-organic liquid type GKZH-940.01-0.1

After thorough mixing and provisioning, the composition is poured into a vinyl-plastic matrix located on a vacuum plate to limiters of the required height, onto which silicate glass is placed and exposed to arc lamps (South) or mercury-quartz lamps (5-6 min). The printed duplicate form is easily separated from the matrix and possesses the required qualities: flexibility, clarity of printing elements, 2 mm or more thick.

Production tests of such duplicate printing plates have shown that they have a high pliability (more than 100 thousand hours of impressions), perceive and give paint well, and reduce the time for dressing.

Example 2. A photopolymerizable composition of the following composition is prepared, wt. including:

Oligoether acrylate - metharyl diethylene glycol phthalate (type MDF-1) 1000

Methyl methacrylate100-200

Benzoin 7,5-15

This composition, after carefully moving the backing up, is poured into a vinyl plastic or other matrix in an amount that ensures the formation of a hard layer on the surface of a point of the printing stereotype elements and subjected to photopolymerization as in Example 1.

Then install the side limits of the desired height. A photopolymerizable composition of the following composition is poured onto the surface of the polymerisation layer, wt. including:

Oligoether acrylate methacrylate. Ethylene glycol phthalate Methyl methacrylate100-140

Aerosil 20-30

Benzoin 7,5-15

After covering with silicate glass, this layer is also subjected to α-photopolymerization according to example 1.

The printed duplicate form, which has the required accuracy of reproduction of the matrix and a flexible elastic-elastic base, is easily separated from the matrix.

Subject invention

Claims (6)

1. Photopolymerizing composition for printing forms-duplicates based on acrylic monomers, characterized in that, in order to simplify the production of printing forms, ensure their high quality and runnability, the composition includes polymerization-capable oligomers, sensitizer, dyes and inorganic and high molecular weight fillers. 2. A composition according to claim 1, distinguished by the fact that oligomer oligomers are used as oligomers. 3. A composition according to claim I, characterized in that benzoin is used as a sensitizer. 4. COMPOSITION p. 1, characterized by the fact that aerosil, aluminum powder or fiberglass are used as the inorganic filler. 5. A composition according to claim 1, characterized in that polyamides are used as the high molecular weight filler. 6. Composition on mon. 1-5, characterized in that, in order to increase the hydrophobicity of the composition, a silicone fluid is introduced into its composition.