SU316267A1 - LIBRARY \ - Google Patents

Description

HEAT SENSITIVE RECORDING MATERIAL

This invention relates to heat transfer recording materials used for recording and producing information.

A heat sensitive gliding material is known, consisting of a substrate and a heat-sensitive protective layer consisting of a hydrophobic thermoplastic polymer, a hydrophilic binder and a hydrophilic pigment.

In order to obtain a clear copy of the original when using the elution method (water development), recording material with a heat sensitive layer with good adhesion to the substrate on the exposed bridges is required.

In order to improve the adhesion of the recording layer to the substrate, a heat sensitive recording material has been proposed, consisting of 1 of the substrate, an intermediate layer containing a hydrophilic binder and a hydrophobic thermoplastic polymer having a melting point lower, equal to or slightly higher than the melting point of the recording layer, and heat sensitive recording layer comprising a hydrophobic thermoplastic polymer, a hydrophilic binder and a hydrophilic pigment, and in the recording and intermediate layers in a est1ve hydrophobic thermoplastic polymer applied polyethylene, polyethyl acrylate, or a copolymer of polyvinylidene chloride, N-butilmalei "imide ita.ko and" oic acid.

During the exposure of the recording heat sensitive material, the particles of the hydrophobic thermoplastic polymer are heated to soften or melt in the exposed areas of the recording

lay In order for the softened or molten polymer to be firmly held on, the thermoplastic substance must be softened or melted in the lower layer. This substance should be

hydrophobic enough to bond or adhere to the hydrophobic polymer in the recording layer. The intermediate layer can be applied directly onto the substrate, in the context of which it possesses the required adhesion, or onto the substrate previously (Coated with an intermediate sublayer so that sufficient adhesion between this intermediate layer and the substrate is created at the snoring temperature.

The hydrophilic binder of the recording layer, and sometimes also the intermediate layer, can be a hydrophilic natural colloid, a modified natural colloid, or synthetic synthetic hydrophilic. One binder can be extinct from the group of natural or modified natural hydrophilic colloids, 1K that are gelatin, animal, glue, Casein, hydroxyethyl cellulose, arboxymethyl cellulose, methyl cellulose, gum arabic, algate sodium, and hydrophilic derivatives of such colloidal (in. They can also be chosen from the group of synthetic polypropylene alcohol, polyvinyl alcohol, poly-N-vinylnirrolidane, polyvinylamine, polyethylene oxide, lolistirolsulfonic acid, polyacrylic acid, and hydrophilic derivatives of such polymers. Materials include loln-Nvilnini. rrolidone, poly B; Japyl alcohol. polyethylene oxide and gelatin containing a wetting agent, for example, urine. The 3 descriptive layer contains less than 50% by weight of dpsneria, consisting of a hydrophilic binder and 1 hydrophobic thermoplastic polymer particles dispersed in the binder. It is desirable to apply and dry the intermediate layer in such conditions that it is permeable to water at a temperature slightly higher than green. Particles of 1polymer, solid at room temperature, should soften at a temperature above room temperature and 10-200 ° C. It is very convenient to use polymers with a melting point or glass transition temperature of 10–200 ° C in the recording and intermediate layers. Especially for this purpose polyethylen chloride and polyvinylidene with a melting point of PO l 190 ° C, respectively), as well as the following polymers with the corresponding glass temperature: polystyrene (100 ° C), lolymethyl methacrylate (70 and 105 ° C), polyethylmethavrylate (50 ° C), lolivilyl chloride (about 70 ° C), polyacrylonitrle (about 100 ° C), poly-M-vinyl 1carbazole (200 ° C). It is desirable that the polymer for the intermediate layer has a melting or glass transition temperature below the temperature of the recording layer. It is known that the temperature of glassbath can be reduced by the addition of certain substances, called plasticizers. In the recording and intermediate layers, thermoplastic hydrophobic polymers can be added, the iC molecules are p | low in very wide limits. Preferred are polymers having a molecular weight of from 5,000 to 1,000,000. Hydrophobic thermoplastic homopoly measures and copolymers suitable for the production of the recording and intermediate layers in accordance with the invention are applied in the form of aqueous dispersions containing a hydrophilic binder. Also proposed are aqueous dispersions of lolimer, lr-IGO, dispersed by means of a water-insoluble polymer solution, in a water-immiscible volatile solvent, in an aqueous solution of a hydrophilic binder. Chlorinated hydrocarbons such as methylene chloride and trichloroethyl may be used as solvents. In addition, dispersions of atolymers suitable for use in the recording and intermediate layers of the material can be obtained with mechanical diopergy in water of finely divided polymer particles, preferably with the help of a surfactant or hydrophilic protective colloid, polyvinyl alcohol and gelatyles. Preferred are latexes, which are obtained by emulsion polymerization. The particle size of the polymer in the dispersion can vary from 0.01 to 50 microns. However, for a recording layer, the larger the particles, the lower their resolution. Very good results are obtained when using dispersions with polymer particle sizes in the range from 0.05 to 20 microns. Good results are obtained with Limprilenip Hydrosol with a polymer particle size of not more than 0.1 microns. The preferred thickness of the recording and intermediate layers in accordance with this invention is in the range from 0.5 to 10 microns. BecoiBoe The ratio of particles of a thermopolymer polymer to a hydrophilic binder in the recording and intermediate layer (if the latter contains a hydrophilic binder) is more than 1: 1, and preferably more than 3: 2. The recording layer in a water-soluble state contains substances that absorb light and transform it. in heat. Preferred substances that absorb visible and infrared rays and convert them to heat are black pygmelts or dark colored pigments, such as finely ground carbon black, graphite, iron blue, oxides, sulfides or carbonates of heavy metals, in particular metals with an atomic weight from 45 up to 210, for example manganese or lead sulphides, or specified heavy metals in a finely divided state, for example, tin, bismuth, iron, cobalt and nickel. I can also use mixtures of colored substances to achieve the absorption of light from the entire visible spectrum. However, such substances absorb not only in the limits of the visible spectrum, but can absorb to some extent the infra-rays and the light emitted by the flash lamp (pulsed).

out, azine, phthalocyanine, anthraquin and related dyes. Such dyes can be used in the form of dispersions or solutions.

Example 1. On a substrate of polyethylene terephthalate with a thickness of 0.1 ml1 with a gelatinous underlayer, the following composition is applied (at the rate of 30 g per 1 cm), g:

10% WATER gelatin solution400

 aqueous dioperium loliethylbna with particles less than 1 micron in size and with an average molecular weight from 15,000 to 30,000 320

(Water240

10% aqueous solution of cainoiina40

3% -1 solution of an aqueous solution of the sodium salt of the condensation product of oleic acid and methyl taurine 40

4% aqueous formaldehyde solution20

The resulting intermediate layer is dried at a temperature of 30 ° C. A heat-sensitive layer is applied to this layer (suitable for a joke to show leaching with a wipe with cotton, soaked in aine water at a temperature of 20 ° C) at the rate of 30 g pa 1 cm of the following composition, g:

10% aqueous solution of polyvinyl metal45

40% polyethylene water dispersion60

water320

water dispersion of carbon black. (containing 53 g of carbon black per 100 g, average particle size 0.1 micron, 23 g of water, 18 g of glycol and 6 g of oxide "onylphenyl polyethylene) 8

3% aqueous solution of sodium

tetradecyl sulfate salts25

After drying, the material is used for contact printing through a transparent negative with printed text. Enopen for 1/2000 s with a 1000-watt xenon gas discharge lamp located 4 cm from the recording layer.

After exposure, the recording layer is wiped with a cotton swab moistened with water at a temperature of 20 ° C and in this way the unexposed and still permeable portions of the recording layer are removed.

Example 2. The following composition is applied on a half-ethylene terephthalate substrate with a thickness of 0.1 mm with a gelatinous underlayer (at the rate of 25 g per 1 sgl), g;

The intermediate layer thus obtained is dried at 130 ° C. A heat-sensitive layer is applied on this layer at a rate of 30 g / cm-of the following composition, g:

polyethylene glycol from molecules ppym weighing 600020

40% water dispersion of polyethylene (according to the example 1) 80

water325

water dispersion of carbon black (for example 1) 50

3% aqueous sodium tetradecyl sulfate 25

Exposure and development are performed as described in Example 1.

Example 3. A layer of the following composition (at the rate of 30 2 / c, u2) and dried at 30 ° C, g, is applied to a paper backing: KU, coated with polyethylene and weighing 120 g / m -, g:

10% aqueous solution of gelatin200 4 4% aqueous dispersion of polyethylene 160 water 120 20% aqueous solution of saponin 20 50% aqueous solution of the sodium salt of the condensation product of oleic acid and methyl taurine 20

Formaldehyde 10 polyethylene-glycol 4% aqueous solution with an average molecular weight of 2000010

A heat-sensitive layer is applied to this layer at a rate of 30 g / cm of the following composition, g:

20% aqueous solution of polyethylene glycol with an average molecular weight of 200000200

40% water dispersion of polyethylene (according to example 1) 80

water145

water diopers soot (for example 1) 40

3% aqueous solution of sodium tetradecyl sulfate 25

Exposure and display are made as described in Example 1.

Prpmer 4. On the floor ethylene terephthalate substrate with a thickness of 0.1 mm is applied (at the rate of 15 g / cm) a layer of the following composition, g:

4% water dispersion of polyethylene (according to example 1) 50 20% water dispersion of polyethylacrylate 50 30% water dioper oxide: cream and particles with a size of 25 x 50 water 750 ethanol 100

After drying of the ave 60 ° C, a heat-sensitive layer of the following coiCTHBa is applied on the obtained sublayer at a rate of 20 g / cm, g:

10% aqueous solution of polyvinylpvrolidone with an average molecular weight of 30000170

40% aqueous dispersion of polyethylene (described in Example Ij 195

water dispersion of carbon black (containing 1 to 100 g 16 g of carbon black and 2 g of the thin poly-N-vinylpyrrolidone) 450

water120

3% aqueous solution of tetradecyl sulfate sodium salt65

After being kept at 50 ° C, the resulting material is ekaponuyut and (show -K as described in example 1.

Example 5. On a polyethylene terephthalate substrate with a thickness of 0.1 mm (Apply the following cocTaiB (at the rate of 20 g / s.i), g:

40% aqueous Dianersey polyethylene (described in Example 1) 50

 Aqueous dioperium of a copolymer of vinylidene chloride, N-butyl-malein-Mide and itaconic acid (83: 15; 2) 50

water750

30% aqueous dispersion of silica with particles of size 25 μ50

ethanol100

After the substrate at 60 ° C on the sublayer obtained (A heat-sensitive layer is applied as described in Example 4. After the substrate the obtained material is exposed and developed as described in Example 1.

8 Subject of the invention

Claims (5)

1. A heat sensitive recording material having a substrate and a heat sensitive recording layer comprising a hydrophobic thermoplastic polymer, a hydrophilic binder and a hydrophilic pigment, characterized in that, in order to improve the adhesion of the recording layer to the substrate is coated with an intermediate layer containing a hydrophilic binder and a hydrophobic thermoplastic polymer having a melting point lower than or slightly higher than the melting point of the polymer record (CHA: a new layer, and as a hydrophobic thermoplastic polymer in the recording and intermediate layers polyethylene, polyethylacrylate or copolymer of polyvinylidenechloride, N-butylmaleimide and itaconic acid are used. 2. Material on in. 1, characterized in that in the intermediate layer a hydrophilic binder is applied, less soluble than hydrophilic binder recording layer. 3. Material according to claim 2, characterized in that poly-HNvnyl pyrrolidone is used as the hydrophilic binder of the recording layer, and gelatin as the hydrophilic binder of the intermediate layer. 4. A material according to claim 1, characterized in that in the intermediate layer the hydrophobic thermoplastic polymer is taken in an amount of more than 1: 1 relative to a hydrophilic binder. 5. A material according to claim 1, characterized in that the cell used is triacetylcellulose or polyester.