RU2338605C2 - Manufacturing method of metallised paper by means of pouring in - Google Patents

Abstract

FIELD: paper industry.

SUBSTANCE: method includes stages of the first water film-forming composition apply on substratum by pouring in method, apply by pouring in method of the second film-forming composition to the mentioned above metallised substratum. The first and the second water film-forming compositions include the first polymer in the form of emulsion and/or the second polymer in the form of colloidal solution.

EFFECT: it is provided high homogeneity of applied cover, received paper has non-transparency and allows good light-, water-, steam- and oxygen-protective characteristics, speed of paper production is increased.

16 cl, 15 ex

Description

Field of Invention

The invention relates to a method for the production of metallized paper, which includes the use of an aqueous coating film-forming composition, which can be applied by filling.

State of the art

Metallized paper is usually made by direct high vacuum metallization. In this process, the substrate to be metallized is preliminarily coated with a film layer to create a smooth surface suitable for metallization. Coated paper is placed in a high-vacuum chamber, where a vaporous metal, usually aluminum, is applied to its surface. This metal layer is coated with another film layer to protect the aforementioned metal layer and prevent its oxidation. The total mass of the deposited layers is usually from 1 to 3 g / m ² .

For the above films and coatings, polymers of a very different nature are used, such as acrylic derivatives, styrene derivatives, epoxies, nitrocellulose, etc. However, all compositions used in this process have the common property of forming a film upon evaporation of the solvent used.

The coating layer applied before metallization must meet a number of requirements, such as the aforementioned smoothness of the surface, good adhesion of the metal and properties that give a “metallic” appearance to paper after metallization. As for the coating layer applied after metallization, it should cover the surface well to prevent metal oxidation, have good adhesion to the metal and meet a number of requirements depending on the final destination of the finished product.

The application of these compounds to paper is usually carried out by intaglio printing technique. The main disadvantages of this technique are the low speed of the process and the narrow framework in which the rheological properties of the compositions (always in the low viscosity zone) must be in order to ensure high quality.

If you follow these technological processes, the production speed does not exceed 400 m / min. Despite the well-known technological advantages, the speed of the printing process using gravure printing is very far from other paper processing methods used.

Based on the rheological requirements for intaglio compositions, it is necessary that they maintain a low level of viscosity at a low shear rate, since otherwise it is impossible to achieve either good transfer of the composition to paper, good alignment, or good surface treatment. These rheological requirements severely limit the solids content of the compositions used, usually not higher than 30% in the case of solvent-based media and not higher than 35% in the case of aqueous media. Regarding compositions based on aqueous media, it should be noted that the indicated relatively low solids content prevents the development of compositions suitable for a process that replaces the currently used solvent based compositions.

Another limitation arising from the intaglio printing technique relates to the processing of a layer after it has been formed: usually the deposited layers have a number of surface defects, such as small holes, craters and microchannels. These inhomogeneities in the film significantly reduce its light, vapor, water, and oxygen retention properties.

Therefore, with the current level of technology there is a need to develop a method for the production of metallized paper, which would partially or completely overcome the disadvantages of the above methods.

Summary of the invention

The present invention solves the problem of creating an improved method for the production of metallized paper, which overcomes partially or completely the disadvantages of the production methods known from the prior art.

The solution proposed according to the present invention is based on the fact that the inventors have discovered an aqueous film-forming composition with certain rheological parameters and / or static surface tension properties that make it suitable for use in the filling technique in the manufacture of metallized paper.

Thus, according to one aspect, the present invention relates to an improved method for the production of metallized paper, which comprises applying a suitable aqueous film-forming composition to a substrate by pouring.

In another aspect, the invention provides an aqueous film-forming composition comprising a first polymer in the form of an emulsion and / or a second polymer in the form of a colloidal dispersion. Said aqueous composition has certain rheological properties and / or static characteristics of surface tension, making it suitable for coating by pouring.

The method proposed by the present invention, which involves applying the aforementioned aqueous film-forming composition by pouring, has several advantages, as it provides excellent control over the applied layer and its high homogeneity. In this way, high quality film coatings are obtained that give the coated product opacity and also have good light, water, vapor and oxygen barrier properties. An additional advantage is that the invention allows to achieve production speeds of up to 2000 m / min.

Description of the invention

According to the present invention, a method for the production of metallized paper (hereinafter - the "method according to the invention"), which includes the following stages:

I) applying to the substrate the first aqueous film-forming composition by pouring;

Ii) metallization of the coated substrate; and

III) applying to the specified metallized substrate a second aqueous film-forming composition by pouring,

characterized in that said first and / or second aqueous film-forming compositions comprise a first polymer in the form of an emulsion and / or a second polymer in the form of a colloidal dispersion.

These first and / or second aqueous film-forming compositions used in the inventive metallized paper production method (hereinafter, “film-forming compositions of the invention”) are characterized in that they have certain rheological parameters and / or static surface tension parameters and are another aspect of the present invention. More specifically, the aqueous film-forming composition according to the invention has at least one of the following technical parameters:

a) viscosity at a low shear rate, measured in a Brookfield viscometer at 60 rpm and 20 ° C, from 60 to 220 MPa, preferably from 100 to 180 MPa;

b) the viscosity at high shear rate, measured in a Haake viscometer at 37750 s ^-1 and 20 ° C, from 2 to 35 MPa, preferably from 7 to 20 MPa; or

c) static surface tension, measured using an annular tensiometer, from 25 to 40 dyne / cm, preferably from 32 to 37 dyne / cm.

High shear viscosity in the present invention is understood to mean shear viscosity above 10,000 s ^-1 .

According to one possible embodiment of the invention, the aqueous film-forming composition has only one of the aforementioned characteristics [(a), (b) or (c)], however, in a preferred embodiment of the invention, the aqueous film-forming composition according to the invention meets at least two of the above characteristics [ (a) and (b), or (a) and (c), or (b) and (c)], but more preferably, said aqueous film-forming composition according to the invention meets the three above-mentioned characteristics (a), (b) and ( at).

The viscosity values at high and low shear rates, as well as the static surface tension of the aforementioned aqueous film-forming composition according to the invention, can, as indicated above, be within wide limits, which is an advantage over compositions used in conventional gravure printing processes, which should have a low viscosity at a low shear rate. A picture of the rheological parameters of the aqueous film-forming compositions of the invention indicates that these compositions have strong pseudoplastic properties. In one embodiment, the high shear viscosity of the aqueous film-forming composition of the invention, measured with a Haake viscometer at 37.750 s ^-1 and 20 ° C, is kept low, i.e. 2-30 MPa, preferably 5-15 MPa, giving a high quality layer and maintaining an acceptable pressure in the system where this composition circulates when using nozzles, such as K-nozzles. On the other hand, viscosity is too low at a low shear rate (viscosity at a low shear rate is considered low if measured using a Brookfield viscometer at 60 rpm and 20 ° C it is less than 60 MPa) prevents proper leveling of the applied composition. Preferred is the viscosity at a low shear rate, equal to or higher than 60 MPa, when measured in a Brookfield viscometer at 60 rpm and 20 ° C; more preferred is the viscosity at low shear rate, measured under these conditions, which is 100-180 MPa. A viscosity at a low shear rate (Brookfield, at 60 rpm and 20 ° C) equal to or greater than 60 MPa is sufficient to achieve good stability of the loading of the aqueous film-forming composition of the invention and maintain its stability, while the viscosity is below 60 MPa (according to Brookfield, at 60 rpm and 20 ° C) leads to uneven application in the form of waves and poor distribution of the composition on the substrate.

The aqueous film-forming composition according to the invention includes a first emulsion-shaped polymer selected from the group consisting of acrylic polymers, acrylic styrene polymers, modified acrylic polymers and mixtures thereof; and / or a second colloidal dispersion polymer selected from the group consisting of acrylic polymers, modified acrylic polymers and mixtures thereof. In the present description of the invention, the term “modified acrylic polymer” refers to acrylic polymers having amide and / or amino-hydroxyl groups in their structure. In one embodiment, said emulsion is an oil in water emulsion.

The term “polymer,” as used herein, encompasses homopolymers, modified homopolymers, copolymers of two or more different monomers, modified copolymers and mixtures thereof. The term “modified copolymer” as used in the present description of the invention refers to copolymers having different functional groups in their structure, for example, amino, amide and / or hydroxyl groups that modify the physicochemical properties of the copolymers.

As the first polymer, a polymer selected from acrylic polymers, acrylostyrene polymers, modified acrylic polymers and mixtures thereof can be used. Said first polymer is in the form of an emulsion, for example, an oil / water emulsion. Examples of the aforementioned first polymer are, inter alia, polymers sold under the trademarks Albucryl NHV-21 (Noveno Spain, SL), SCX HCR-2000, (Johnson POLYMER), JONCRYL ECO 2189 (JOHNSON POLYMER) and JONCRYL ECO 2189 (Johnson POLYMER) etc.

As the second polymer, a polymer selected from acrylic polymers, modified acrylic polymers and mixtures thereof can be used. Examples of the above second polymer are, inter alia, polymers sold under the trademarks PB-383 (Dianal America, Inc.), SCX-JONCRYL 661 (Johnson POLYMER) and 39TSE109 (Johnson POLYMER), etc. The specified second polymer is in a state of colloidal dispersion. The size of colloidal particles can vary within wide limits, since it strongly depends on the physicochemical parameters of the medium. However, the average molecular weight of the polymer chains used in the aqueous film-forming composition of the invention is between 30,000 and 85,000.

In general, a colloidal dispersion of said second polymer is prepared in the usual manner. Depending on the nature of the second polymer and its commercially available form, said second polymer may be dispersed in water and neutralized with a neutralizing agent such as ammonium, sodium hydroxide and organic amines; or, if the polymer is purchased in solid form, it can be dispersed in water and neutralized with said neutralizing agents when heated or in the absence thereof. In one embodiment, the aqueous film-forming composition of the invention comprises an emulsion of a first polymer in an amount of from 10 to 70% by weight of the total resin based on dry matter and a colloidal emulsion of the second polymer in an amount of from 30 to 90% by weight of the total resin of dry matter calculation. In the present application, “resin” means both polymers in the form of an emulsion and polymers in the form of a colloidal dispersion.

The aqueous film-forming composition according to the invention may, if desired, additionally contain one or more additives selected from thickeners, surfactants, pigments, waxes, substances traditionally used in the manufacture of metallized paper and mixtures thereof. Illustrative examples of these commonly used substances are antifoam agents, dispersing agents, leveling agents, etc.

The thickener changes the rheology of the composition to which it is added. Although almost any thickener can be used, in one embodiment of the invention said thickener is selected from acrylic, polyurethane polymers, acrylic-acrylamide copolymers, cellulose thickeners and mixtures thereof. Examples of such thickeners are, among others, thickeners marketed under the trademarks Viscolam 600 (Lamberti), Viscoatex 730 (Coatex), COATEX RHEO-2000 (Coatex), Coapur (Campi y Jove, SA) and Sterocoll BL (BASF) etc. Although cellulose thickeners, i.e. thickeners containing cellulose-based polymers and / or derivatives thereof, for example sodium carboxymethyl cellulose, the results of applying the method of the invention using a cellulose thickener alone or in combination with another thickener are significantly worse than results obtained using other thickeners (see Examples 11 and 12, where it turns out, respectively, the gloss typical for matte polishing (18%), or non-metallic gray). The gloss of a high-quality glossy surface on metallized paper is usually between 25 and 60%.

In one embodiment of the invention, the aqueous film-forming composition of the invention includes, in addition to the above emulsion of the first polymer and colloidal dispersion of the second polymer, also a thickener in an amount of from 2 to 5 wt.% Of the total weight of the resin, based on the dry matter. Typically, the thickener is added to the aqueous film-forming composition according to the invention before it is applied to the substrate, for example, 24 hours before application of the composition in bulk, so that the thickener has the ability to exert its effect on the rheological properties of the composition before application. Typically, a thickener is added slowly and with vigorous stirring.

The aqueous film-forming composition according to the invention may contain, in addition to the above emulsions of the first polymer and colloidal dispersion of the second polymer, a surfactant in an amount of from 0.5 to 3 wt.% Of the total resin weight based on dry matter, where the surfactant promotes better distribution of the composition during application by pouring. The specified surfactant can be selected from anionic surfactants, nonionic surfactants and mixtures thereof. Although virtually any surfactant can be used, in one embodiment, the anionic surfactant is a sulfonic acid derivative, such as, for example, a surfactant sold under the trademark Troysol LAC (Troy Chemical Corporation). Similarly, although virtually any nonionic surfactant can be used, in one embodiment, the nonionic surfactant is a nonionic silicon-organic surfactant, such as a modified polysiloxane, for example BYJ-346 or BYK-348 (BYK Chemie).

The aqueous film-forming composition of the invention may include wax in addition to the aforementioned first emulsion polymer and a second colloidal dispersion polymer. Although virtually any wax can be used, in one embodiment, the above wax is a wax sold on the market under the trademark LUBA-print 654 / D1 (L.P. Bader & Co. Gmbh), which is a dispersion of polyethylene wax in isopropanol. Other waxes that can be used in these compositions include mixtures of aqueous dispersion waxes, such as those available on the market under the brand name Aquacer 535 (BYK Wax Additives); derivatives of polyethylene in aqueous suspension, such as those marketed under the brand name 10ZK44 (Sun Chemical); polyethylene dispersed in isopropanol, for example, marketed under the trademark Ceracol 40 (BYK Wax Additives), etc. The amount of wax can vary in the range from 0.5 to 3 wt.% Of the total weight of the resin, based on the dry matter, taking into account the quality and purpose of the wax.

The aqueous film-forming composition of the invention may include, if desired, one or more pigments in the form of a dispersion or solution and / or one or more products traditionally used in the manufacture of metallized paper and known to those skilled in the art. As mentioned products, we can name silicone-based leveling additives, such as those available on the market under the trademarks BYK-333 and BYK-361N (BYK Chemie); acrylic leveling additives, for example, sold under the trademark EDAPLAN LA 403 (Munzig Chemie); dispersing agents, for example, marketed under the brand name Disper BYK 191 (BYK Chemie), etc.

The composition of the invention can simply be prepared in a suitable container or reactor equipped with a stirrer, by gradually adding the various components in succession, as demonstrated in the examples provided herein. As already disclosed, the method of manufacturing metallized paper proposed by the invention (i.e., the method according to the invention) includes the above embodiment of steps I, II and III, which is described in more detail below and is characterized by the use of an aqueous film-forming composition according to the invention in stage I, or in stage III, or in both stages I and III.

Stage I involves applying the first aqueous film-forming composition to a substrate using a loading technique. Said first aqueous film-forming composition may be an aqueous film-forming composition of those commonly used for the production of metallized paper, but preferably an aqueous film-forming composition according to the invention.

The term "substrate" in the present invention means a substrate suitable for metallization, i.e. a substrate that has physico-chemical parameters that correctly apply a smooth glossy film to its surface for subsequent metallization. For example, the substrate is coated paper, for example, having a coating on one side (1 / S) or on two sides (2 / S). The substrate can be passed through a tunnel with hot air before applying the first coating in order to reduce the humidity of the substrate for the successful passage of stage II metallization. The temperature of the hot air in the tunnel varies, depending on the humidity of the substrate, and usually ranges from 100 to 140 ° C.

The filling technique is a traditionally used method, which usually involves applying the composition to a substrate by passing the substrate through a composition pouring in the form of a “curtain”. A “curtain” can be created by passing the composition through a suitable nozzle. In one embodiment of the present invention, said composition is passed through a K-nozzle, in particular a single K-nozzle. The height of the specified nozzle above the substrate and other process parameters can be easily selected for each specific case by a person skilled in the art. The composition is poured into a container of the circulation system for painting. The system is ready for use after stabilization of the circulation system performance, stabilization of the "curtain", as well as after establishing visual control over foaming in the container and the absence of gaps in the "curtain". In one embodiment of the method according to the invention, the width of the "curtain" is from 1300 to 2200 mm, preferably from 1600 to 2000 mm. According to one specific embodiment of the present invention, the width of the curtain is approximately 1600 mm and the distribution of the dry coating film is from 1.5 to 3.1 g / m ² , preferably from 1.8 to 2.5 g / m ² .

After stage I, the first composition deposited on the substrate forms a coating or film on the aforementioned substrate by evaporation of the water present in this first composition. Evaporation of water can be carried out in the traditional way, for example, by raising the temperature of the coated substrate in a tunnel in which hot air circulates, for example, to a temperature that is higher than the minimum film formation temperature. In the tunnel with hot air circulation, different temperatures can be maintained in each section, and temperature values can be easily selected by a specialist in this field in order to achieve the required evaporation, the desired final degree of humidity and the final appearance of the coated substrate. Although the absolute moisture content of the substrate coated with the first composition can vary widely, it usually does not exceed 3%, in particular, the absolute moisture content of the substrate coated with the first aqueous film-forming composition is 2-3%, preferably 2.3- 2.8% to achieve good metallization in stage II. As an illustration, in one embodiment of the invention, a temperature gradient of the hot air circulating in the tunnel is maintained from 80 to 140 ° C.

Stage II metallization of the coated substrate can be carried out by conventional methods, for example, direct high-vacuum metallization of the substrate obtained in stage I.

Stage III involves applying the technique of pouring a second aqueous film-forming composition onto a pre-metallized substrate. The above second aqueous film-forming composition, which may be identical to or different from the above first aqueous film-forming composition, may be an aqueous film-forming composition according to the invention or, alternatively, an aqueous film-forming composition from those commonly used in the manufacture of metallized paper, preferably an aqueous film-forming composition according to the invention. One of the features of the method according to the invention is that at least one of the above first or second aqueous film-forming compositions used therein is an aqueous film-forming composition according to the invention.

Application by pouring onto a pre-metallized substrate of the aforementioned aqueous film-forming composition is carried out in the same way as in stage I. In one embodiment, the metallized substrate has a mass of 47 to 130 g / m ² , preferably 52 to 90 g / m ² , and a moisture level metallized structure before applying the above aqueous film-forming composition is from 1.5 to 2.2%. After the above-mentioned second aqueous film-forming composition is applied to a metal substrate, water is removed to obtain a film on a metal substrate. Water can be removed by any conventional method, for example, by passing a coated metal substrate through a drying tunnel in which hot air circulates, whereby a film forms due to the evaporation of water. After the water has been removed and a film has formed, the substrate is rewetted by applying water to its back surface using conventional systems such as scooters, steam nozzles, etc. The final absolute moisture content of metallized paper is usually from 3.5 to 5.4%, depending on the quality of the product.

The static surface tension of the aqueous film-forming composition of the invention can be controlled by two alternative methods, depending on whether the composition is applied to a metallized or non-metallized substrate. In the first case, the method of measuring the angle of contact of a drop of water (TAPPI 458 os-70 method) using a device for determining surface wettability (Lorentzen & Wettre) is used. In the second case, the standardized TAPPI T 698 pm-83 method is used, determining the surface energy of the film using solutions with known surface energy. Proper control of the above parameters ensures the correct application of the composition.

The lack of contact between the substrate and the applied composition during the implementation of the method according to the invention avoids direct contact with the application devices, as is the case in other methods known from the prior art, and, in turn, provides excellent continuous monitoring of the coating, high uniformity and high quality coated product. The production speed increases significantly, reaching in some cases 2000 m / min, and usually 600-1000 m / min. The method according to the invention allows the use of compositions with a wide range of rheological properties and, therefore, with a high content of solid particles. The uniformity of the coating layer provides better surface coverage, greater opacity, improving light, oxygen and water-proof properties. The coated substrate before metallization, metallized paper and the coating obtained at the end of the process are checked to determine the correct distribution of the above first and second aqueous film-forming compositions, and their gloss is measured using a gloss meter. In the particular case of the invention, the gloss of the coated substrate is measured with a 75 ° slope and a 65 ° slope for metallized paper obtained at the end of the process (see Examples). In one embodiment, the gloss of the coated substrate obtained using the aqueous film-forming composition of the invention, which is the aforementioned first aqueous film-forming composition, is about 70%; the gloss of the metallized substrate before applying the second aqueous film-forming composition by the method according to the invention is usually 35-40%; and the gloss of the product obtained by applying the second aqueous film-forming composition according to the invention is 10-25%.

The following Examples of the invention should not be interpreted as limiting the scope of the present invention.

Example 1

255.5 kg of water and 33 kg of RV-383 (modified acrylic polymer in the solid state, 100% solid) are placed in a container with a capacity of 1000 liters. To this mixture, 12 kg of ammonia (25% solution in water, 0% solids) are added with stirring with a wall mixer (600 rpm) and dispersed for 60 minutes using a wall mixer (600 rpm). After this time, add 33 kg of RV-383, 10 kg of water and mix unchanged for another 60 minutes. After this, the mixture is allowed to cool to room temperature, the stirring speed is reduced to 100 rpm and the following components are added sequentially: 12.8 kg of ammonia (concentration 25%), 4.0 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solid substances), 2.10 kg Troysol LAC (modified sulfosuccinate surfactant, 50% solids) and 0.12 kg KV-70 (thickener in the form of a water-oil suspension based on a copolymer of acrylic and acrylamide, 33% solid) pre-dispersed in 36 kg of water. Finally, add 60 kg of water, maintaining the same mixing mode for 2 hours. The prepared composition is now ready for use and has the following parameters:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 70 MPa;

2) static surface tension measured using a ring tensiometer 33.1 dyne / cm; and

3) the solids content in the composition of 14.4%.

Application Method

The composition is loaded into a container of the circulation system for painting. After establishing the circulation speed and stable “curtains”, as well as visual monitoring of foaming in the tank and the absence of gaps in the “curtain”, the system is ready for coating. This procedure is the same in all the examples described below.

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side (1 / S), suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The coating speed is 800-1000 m / min. The distribution of the dry film is from 1.6 to 2.5 g / m ² . Before applying the composition, the paper is passed through a drying tunnel with hot air and it leaves it at a temperature of 105-110 ° C. After applying the composition, the paper passes through another tunnel with hot air, where a temperature gradient is maintained, increasing from 80 ° C in the first section to 140 ° C in the last section. Once the paper dries, it is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is from 2.0 to 2.5%. The paper is thus ready for the high vacuum metallization process.

Example 2

400 kg of water and 200 kg of SCX-661 (colloidal solution of acrylic polymer, 44% solids) are placed in a container with a capacity of 1000 liters. To this mixture, 25 kg of ammonia (25% aqueous solution, 0% solids content) are added, with stirring (with a wall mixer with a frequency of 600 rpm), and the mixture is dispersed for 20 minutes under the same mixing mode. After this, the following components are successively added: 5.37 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 2.69 kg of Troysol LAC (modified sulfosuccinate surfactant, 50% solids) and 0.19 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil suspension, 33% solids), previously dispersed in 57 kg of water. Finally, add 100 kg of water and mix in the same mode for 2 hours. After that, the composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 600 rpm, 20 ° C) 107-116 MPa;

2) static surface tension, measured using a ring tensiometer 32,2 dyne / cm; and

3) the solids content in the composition of 11.5%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The width of the coating in this case is 140 cm. The coating speed is 600-1000 m / min. The mass of the dry film is from 1.5 to 2.5 g / m ² . Before applying the composition, the paper passes through a drying tunnel with hot air and leaves it at a temperature of 105-110 ° C. After applying the composition, the paper passes through another tunnel with hot air, where a temperature gradient is maintained, increasing from 80 ° C in the first section to 140 ° C in the last section. Once the paper dries, it is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is from 2.0 to 2.5%. The paper is thus ready for the high vacuum metallization process.

Example 3

In a container with a capacity of 1000 liters, 280 kg of water, 120 kg of SCX-661 (colloidal solution of acrylic polymer, 44% solids), 13.3 kg of Albucryl NHV-21 (aqueous acrylostyrene polymer emulsion) are placed, with stirring (600 rpm) ) and 24 kg of a solution of sodium hydroxide in water (20% solids). Stirring is carried out for 20 minutes, after which the mixing speed is reduced to 100 rpm and sequentially added: 3.60 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 1.8 kg Troysol LAC (modified sulfosuccinate surface -active substance, 50% solids). Finally, add 100 kg of water and maintain the same mixing mode for two hours. Thus prepared composition is now ready for use and has the following characteristics:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 61 mPa;

2) viscosity at high shear rate (Haake, at 37.750 s ^-1 , 20 ° C) 29.8 MPa;

3) static surface tension, measured using a ring tensiometer 32,0 dyne / cm; and;

4) the solids content in the composition of 12.7%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is from 47 to 130 g / m ² . The application width in this case is 140 cm. The application speed is from 600 to 800 m / min. The flow rate of the composition through the nozzle is maintained at 26.5 l / min. The distribution of the applied film is from 1.85 to 2.5 g / m ² .

Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 80 to 140 ° C is maintained. After the paper dries, it is wound on a metal spindle of the rewinding section of the machine. The absolute moisture content of the paper is 2.8%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring the gloss using a gloss meter at a slope of 75 ° for the product before metallization and 60 ° for the metallized product. The gloss of metallized paper before applying the second aqueous film-forming composition is 40%.

Example 4

In a container with a capacity of 1000 liters, 190 kg of water and 103 kg of HCR-2000 (emulsion of acrylic polymer, 40% solids) are placed with stirring (600 rpm). While stirring, 2.1 kg of Viscoatex 730 (a non-associative thickener based on an aqueous emulsion of acrylic copolymers, 30% solids), previously dissolved in 15.4 kg of water, are gradually added. After this, the mixing speed is reduced to 100 rpm and the following components are added sequentially: 2.5 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 1.2 kg of Troysol LAC (modified sulfosuccinate surfactant, 50 % solid) and 0.046 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% solid), previously dispersed in 13.8 kg of water. To this mixture are added 49 kg of SCX-661 and 12.6 kg of a 20% aqueous sodium hydroxide solution. Stirred for two hours, and then leave the composition without stirring for twenty-four hours. After that, the composition thus prepared is ready for use and has the following characteristics:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 60 MPa;

2) viscosity at high shear rate (Haake, at 37.750 s ^-1 , 20 ° C) 11.6 MPa;

3) static surface tension, measured using a ring tensiometer 32 dyne / cm; and

4) the solids content in the composition of 16.0%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The coating speed is from 600 to 1030 m / min. The speed of passage of the composition through the nozzle is maintained at 26.5 l / min. The distribution of the applied film is 1.8-3.1 g / m ² .

Before coating, the paper is passed through a drying tunnel with hot air at a temperature of 140 ° C. After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 85 to 140 ° C is maintained. After drying, the paper is wound on the spindle of the rewinding section of the machine. The absolute moisture content of the paper is 2.8%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring the gloss with a gloss meter at an angle of 75 ° for the product before metallization (equal to 70%) and 60 ° for the metallized product. The gloss of metallized paper before applying the second aqueous film-forming composition is 37%.

Example 5

In a container with a capacity of 1000 liters, 300 kg of water and 141 kg of HCR-2000 (emulsion of acrylic polymer, 40% solids) are placed with stirring (600 rpm). While stirring, gradually add 2.8 kg of Viscoatex 730 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids), previously dissolved in 10 kg of water. After this, the mixing speed is reduced to 100 rpm and the following components are added sequentially: 3.5 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 1.7 kg of Troysol LAC (modified sulfosuccinate surfactant, 50 % solid) and 0.063 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% solid), previously dispersed in 18.9 kg of water. Stirred for two hours and then leave the composition for twenty-four hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 70 MPa;

2) viscosity at high shear rate (Haake at 37.750 s ^-1 , 20 ° C) 2.3 MPa;

3) static surface tension, measured using a ring tensiometer 32 dyne / cm; and

4) the solids content in the composition of 11.8%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The coating width in this case is 140 cm. The coating speed is 600-700 m / min. The speed of passage of the composition through the nozzle is maintained at 26.5 l / min. The distribution of the applied film is from 1.95 to 2.3 g / m ² .

Before coating, the paper is passed through a drying tunnel with hot air at a temperature of 140 ° C. After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 80 to 140 ° C is maintained. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is 2.8%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring gloss using a gloss meter at a slope of 75 ° for the product before metallization (equal to 58%) and 60 ° for the metallized product. The gloss of metallized paper before applying the second aqueous film-forming composition is 35%.

Example 6

In a container with a capacity of 1000 liters, 217 kg of water and 143 kg of Albucryl NHV-21 (emulsion of acrylostyrene polymer, 42% solid) are placed with stirring (600 rpm). While stirring, gradually add 7.1 kg of Viscoatex 730 (non-associative thickener based on an aqueous emulsion of acrylic copolymers, 30% solids), previously dissolved in 33.5 kg of water. After this, the mixing speed is reduced to 100 rpm and the following components are added sequentially: 3.6 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 1.9 kg Troysol LAC (modified sulfosuccinate surfactant, 50 % solid). Stirred for two hours and then leave the composition for twenty-four hours without stirring. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 104 MPa;

2) viscosity at high shear rate (Haak, at 37.750 s ^-1 , 20 ° C) 4.6 MPa;

3) static surface tension measured using a ring tensiometer 32.3 dyne / cm; and

4) the solids content in the composition of 16.1%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is from 47 to 130 g / m ² . The width of application of the composition in this case is 140 cm. The application speed of the composition is from 600 to 700 m / min. The speed of passage of the composition through the nozzle varies in the range from 18.0 to 31.0 l / min. The distribution of the applied film is from 1.60 to 2.2 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where a temperature gradient is maintained, increasing from 75 to 140 ° C. After drying, the paper is wound in the rewind section of the machine. The absolute moisture content of the paper is 2.8%. Quality control is carried out by evaluating the distribution of the composition on paper, measuring the gloss with a gloss meter at a slope of 75 ° for the product before metallization (equal to 76%), and 60 ° for the metallized product. The gloss of metallized paper before applying the second aqueous film-forming composition is 40%.

Example 7

400 kg of 39TSE109 (colloidal solution of modified acrylic polymer, 13% solids) are loaded into a container with a capacity of 1000 liters. Stirring at 100 rpm, add 3.25 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 1.7 kg of Troysol LAC (modified sulfosuccinate surfactant, 50% solids), manually mixed in 15 liter container with 11.5 kg of water. The mixture is stirred for two hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (according to Brookfield, at 60 rpm, 20 ° C) 105 MPa;

2) viscosity at high shear rate (Haak, at 37.750 s ^-1 , 20 ° C) 22.8 MPa;

3) static surface tension measured using a ring tensiometer 33 dyne / cm; and

4) the solids content in the composition is 13%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The application speed of the composition is 700-800 m / min. The speed of passage of the composition through the nozzle is maintained at 26.5 l / min. The distribution of the applied film is from 1.9 to 2.1 g / m ² .

Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 75 to 145 ° C is maintained. After drying, the paper is wound on a spindle in the rewind section of the machine. The absolute moisture content of the paper is 2.8%. Quality control is carried out by evaluating the distribution of the composition on paper, measuring gloss using a gloss meter at a slope of 75 ° for the product before metallization (equal to 71%), and 60 ° for the metallized product. Gloss metallized paper before applying the second aqueous film-forming composition of 37%.

Example 8

A container with a capacity of 1000 liters is charged with mixing (600 rpm), 138 kg of water, 62 kg of Albucryl NHV-21 (emulsion of acrylostyrene polymer, 42% solids) and 200 kg of 39TSE109 (colloidal solution of modified acrylic polymer, 13% solid ) While stirring, 4.9 kg of Viscoatex 730 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids), previously dissolved in 15 kg of water, are gradually added. After that, the mixing speed is reduced to 100 rpm and the following components are added sequentially: 3.25 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 1.7 kg of Troysol LAC (modified sulfosuccinate surfactant, 50 % solid), manually mixed in a metal container with a capacity of 25 l with 11.5 kg of water. Stirred for two hours and then leave the composition for twenty-four hours without stirring. After that, the composition thus prepared is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 70 MPa;

2) viscosity at high shear rate (Haak at 37.750 s ^-1 , 20 ° C) 9.2 MPa;

3) static surface tension measured using a ring tensiometer 33.4 dyne / cm; and

4) the solids content in the composition of 12.5%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. In any case, the mass of the substrate varies and can range from 47 to 130 g / m ² . The application width in this case is 140 cm. The application speed of the composition is 700-800 m / min. The speed of the composition through the nozzle is 26.5 l / min. The distribution of the applied film is from 1.9 to 2.1 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 75 to 145 ° C is maintained. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is 2.9%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring the gloss with a gloss meter at a slope of 75 ° for the product before metallization (equal to 73%), and 60 ° for the metallized product. Gloss metallized paper before applying the second aqueous film-forming composition of 41%.

Example 9

A container with a capacity of 1000 liters is charged with stirring (600 rpm), 170 kg of water, 44.5 kg of ECO2189 (emulsion of acrylic styrene polymer, 48% solids), 19.9 kg of ECO2177 (emulsion of acrylic polymer, 46% solid) and 254 kg 39 kg 39TSE109 (colloidal solution of a modified acrylic polymer, 13% solids). While stirring, 6.1 kg of Viscoatex 730 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids), previously dissolved in 25 kg of water, are gradually added. Then the mixing speed is reduced to 100 rpm and the following components are added sequentially: 3.8 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 1.8 kg Troysol LAC (modified sulfosuccinate surfactant, 50% solids), manually mixed in a metal container with a capacity of 25 l with 15 kg of water. Stirred for two hours and then leave the composition for twenty-four hours without stirring. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 152 MPa;

2) viscosity at high shear rate (Haake at 37.750 s ^-1 , 20 ° C) 10.2 MPa;

3) static surface tension measured using a ring tensiometer 33 dyne / cm; and

4) the solids content in the composition of 12.6%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width is 140 cm. The application speed of the composition is 700-750 m / min. The speed of passage of the composition through the nozzle varies from 23.5 to 26.5 l / min. The distribution of the applied film is from 1.85 to 1.95 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 75 to 140 ° C is maintained. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is 2.9%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring the gloss with a gloss meter at a slope of 75 ° for the product before metallization (equal to 72%), and 60 ° for the metallized product. Gloss metallized paper before applying the second aqueous film-forming composition of 40-41%.

Example 10

280 kg of water and 163.5 kg of Albucryl NHV-21 (aqueous emulsion of acrylostyrene polymer, 42% solids) are loaded into a container with a capacity of 1000 liters. To this mixture was added 4.19 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) with mechanical stirring (100 rpm). To this mixture, subjected to vigorous stirring (600 rpm), 7.82 kg of Viscoatex 730 (non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solid), previously dissolved in 15 kg of water, is gradually added. 5.58 kg of RHEO-2000 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids) pre-dissolved in 15 kg of water is added in the same way. While stirring, add 8.07 kg of COAPUR 3025 (associative thickener polyurethane type, 25% solids), previously dissolved with vigorous stirring (600 rpm) in 36 kg of water. Finally, 4.02 kg of Troysol LAC surfactant (modified sulfosuccinate, 50% solids) and 0.146 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% solids), previously dispersed in 44, are added kg of water. Stirred for 30 minutes and then kept the composition under slow stirring (100 rpm) for two hours to extinguish the foam. After that, the composition is maintained without stirring for twenty-four hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 156-212 MPa;

2) viscosity at high shear rate (Haake at 37.750 s ^-1 , 20 ° C) 10 MPa;

3) static surface tension measured using a ring tensiometer 34.0 dyne / cm; and

4) the solids content in the composition of 14.1%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The application speed of the composition is 700-1000 m / min. The speed of passage of the composition through the nozzle varies from 15.6 to 26.0 l / min. The distribution of the applied film is from 1.5 to 2.5 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient is maintained from 80 ° C in the first section to 140 ° C in the last section. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The paper thus prepared is ready for the high vacuum metallization process. The gloss of the paper after metallization is 40% at 60 ° inclination.

Example 11. Composition for post-metallization

179.8 kg of Albucryl NHV-21 (aqueous emulsion of acrylic styrene polymer, 42% solids), 4.7 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 4.2 kg of Troysol are loaded into a container with a capacity of 100 liters LAC (modified sulfosuccinate surfactant, 50% solids). 1.43 kg Cellogen EP (DAIICHI KOKYO SEIYAKU CO. LTD) (carboxymethyl cellulose with an average molecular weight of 50,000, solid product) previously dissolved in 141.5 kg of water (concentration 1) is added to the mixture with stirring with a wall stirrer (600 rpm) %), and 0.33 kg of KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% of a solid), previously dispersed in 100 kg of water. The mixture was stirred with a wall stirrer (600 rpm) for 30 minutes and finally 20 kg of water was added. The composition prepared in this way is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 10 MPa;

2) static surface tension measured using a ring tensiometer 35 dyne / cm; and

3) the solids content in the composition of 15.4%.

Application Method

Application of the composition is carried out on metallized paper with a mass of 60 g / m ² (although application can be carried out on paper with a mass of 47 to 130 g / m ² ), on which the aqueous film-forming composition of Example 11 was previously applied. After application of the composition, the paper is passed through a drying tunnel with hot air (temperature 130 ° C). After drying, the moisture content of the paper is restored by applying water to the reverse side using a standard LAS system and then wound onto the metal spindle of the device in the rewind section of the machine. The product thus prepared is ready for processing. Humidity of wound paper should be 4.5%. Paper prepared in this way is ready for manipulation. Product quality control is carried out by evaluating the distribution of the composition on paper, measuring gloss with a glossmeter at 60 ° tilt. In this case, the gloss is almost zero (18%).

This example demonstrates that the method according to the invention, which involves the use of a composition comprising a cellulosic thickener, makes it possible to obtain metallic paper with virtually no gloss.

Example 12. Comparative example with cellulose thickeners

In a container with a capacity of 100 liters, 328.8 kg of Albucryl NHV-21 (aqueous emulsion of acrylostyrene polymer, 42% solids), 111 kg of water, 8.6 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) and 4 are placed , 1 kg Troysol LAC (modified sulfosuccinate surfactant, 50% solids). 2.58 kg of Cellogen EP (DAIICHI KOKYO SEIYAKU CO. LTD) (carboxymethyl cellulose with an average molecular weight of 50,000, solid product), previously dissolved in 256 kg of water (concentration 1%), is added to the mixture with stirring with a wall stirrer (600 rpm) . The mixture was stirred for 30 minutes, and finally 20 kg of water was added. The composition obtained in this way is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 78 MPa.

2) static surface tension measured using a ring tensiometer 33.5 dyne / cm; and

3) the solids content in the composition is 16%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The application speed is 700 m / min. The speed of the composition through the nozzle is 26.5 l / min. The distribution of the applied film is 2.2 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air (temperature 130 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient is maintained from 80 ° C in the first section to 140 ° C in the last section. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The absolute humidity of the paper should not exceed 3% so that the metallization during the production process is correct. The paper coated with this first composition has almost zero gloss (about 20% at 75 ° tilt), and after the production process becomes gray.

Example 13. Comparative example with a high surface tension

275 kg of water and 150 kg of Albucryl NHV-21 (aqueous emulsion of acrylostyrene polymer, 42% solids) are loaded into a container with a capacity of 1000 liters. 3.75 kg of Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids) was added to this mixture with mechanical stirring (100 rpm). To this mixture, subjected to vigorous stirring (600 rpm), 7 kg of Viscoatex 730 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids), previously dissolved in 15 kg of water, are gradually added. 5.00 kg of RHEO-2000 (a non-associative thickener based on an aqueous emulsion of an acrylic copolymer, 30% solids), previously dissolved in 15 kg of water, are added in the same way. While stirring, add 7.20 kg of COAPUR 3025 (associative thickener polyurethane type, 25% solids), previously dissolved with vigorous stirring (600 rpm) in 33 kg of water. Finally, 1.30 kg of Troysol LAC surfactant (modified sulfosuccinate, 50% solids) is added. Stirred for 30 minutes and then kept the composition with slow stirring (100 rpm) for two hours to extinguish the foam. After that, the composition is maintained without stirring for twenty-four hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 200 MPa;

2) viscosity at high shear rate (Haake at 37.750 s ^-1 , 20 ° C) 8.7 MPa;

3) static surface tension, measured using a ring tensiometer 42 dyne / cm; and

4) the solids content in the composition of 13.5%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The application speed is 700-1000 m / min. The speed of passage of the composition through the nozzle is 27.6 l / min. The distribution of the applied film is from 1.5 to 2.5 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air, which gives the exit paper a temperature of 105-110 ° C. After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient is maintained from 80 ° C in the first section to 140 ° C in the last section. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The paper thus prepared is ready for the high vacuum metallization process. The gloss of metallized paper before applying the second layer is 33-34% at 60 ° tilt.

The results show that the application is uneven and there are areas with a very small layer thickness, which after metallization have serious visible defects. Such poor application may be due to poor distribution of the composition due to the extremely high surface energies of the composition itself.

Example 14. Comparative example with a low viscosity at a low shear rate

250 kg of water, 56 kg of SCX-661 (colloidal solution of acrylic polymer, 44% solids), 144 kg of Albucryl NHV-21 (aqueous emulsion of acrylostyrene polymer, 42% solid) are loaded into a container with a capacity of 1000 liters (600 rpm) substances) and 10.4 kg of a solution of sodium hydroxide in water (20% solids). Stirred at the same speed for 20 minutes, after which the stirring speed was reduced to 100 rpm and the following components were added sequentially: 5.40 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 2.70 kg Troysol LAC (modified sulfosuccinate surfactant, 50% solids) and 0.18 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% solids), previously dispersed in 30 kg of water. Finally, stirred at the same speed for 2 hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 20 MPa;

2) viscosity at high shear rate (Haak at 37.750 s ^-1 , 20 ° C) 9.2 MPa;

3) static surface tension measured using a ring tensiometer 33.0 dyne / cm; and

4) the solids content in the composition of 16.0%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The coating speed is 620-1000 m / min. The speed of passage of the composition through the nozzle is maintained at a level of 27-31 l / min. The distribution of the applied film is from 2.0 to 3.7 g / m ² .

Before coating, the paper is passed through a drying tunnel with hot air (temperature 140 ° C). After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient from 85 to 140 ° C is maintained. After drying, the paper is wound on a metal spindle in the rewind section of the machine. The absolute moisture content of the paper is 2.8%. The quality control of the product is carried out by evaluating the distribution of the composition on paper, measuring the gloss with a gloss meter at an angle of 75 ° for the product prior to metallization and 60 ° for the metallized product. The gloss of metallized paper before applying the second aqueous film-forming composition is 32-33%.

The results show that the application is uneven. The stability of the "curtain" of the liquid is low, in the distribution of the composition on the paper after drying there are waves characteristic of the unstable "curtain".

Example 15. Comparative example with high viscosity at high shear rate

250 kg of water and 33 kg of RV-383 (modified acrylic polymer in the solid state, 100% solids) are loaded into a container with a capacity of 1000 liters. To this mixture, 35.3 kg of an aqueous solution of sodium hydroxide (20% solids) are added with stirring with a wall stirrer (600 rpm) and stirred for 60 minutes with a wall stirrer (600 rpm). After that add 33 kg of RV-383, 10 kg of water and mix, without changing the speed, another 60 minutes. After this, the following components are successively added: 37.6 kg of ammonia solution (concentration 25%), 4.0 kg Lubaprint LD1 (dispersion of polyethylene wax in isopropanol, 40% solids), 2.10 kg Troysol LAC (modified sulfosuccinate surfactant substance, 50% solids) and 0.12 kg KV-70 (acrylic-acrylamide thickener in the form of a water-oil dispersion, 33% solids), previously dispersed in 12 kg of water. Finally, stirred at the same speed for 2 hours. Thus prepared composition is ready for use and has the following characteristics:

1) viscosity (Brookfield at 60 rpm, 20 ° C) 70 MPa;

2) static surface tension measured using a ring tensiometer 33.1 dyne / cm;

3) viscosity at high shear rate (Haake at 37.750 s ^-1 , 20 ° C) 39 MPa; and

4) the solids content in the composition of 16.2%.

Application Method

The composition in an amount of 60 g / m ² is applied to a substrate having a coating on one side and suitable for metallization. The mass of the substrate is 47-130 g / m ² . The application width in this case is 140 cm. The application speed is 800-1000 m / min. The distribution of the applied film is from 1.8 to 2.8 g / m ² . Before coating, the paper is passed through a drying tunnel with hot air, which gives the exit paper a temperature of 105-110 ° C. After applying the composition, the paper is passed through another tunnel with hot air, where an increasing temperature gradient is maintained from 80 ° C in the first section to 140 ° C in the last section. After drying, the paper is wound on a spindle in the rewind section of the machine. The absolute moisture content of the paper is from 2.0 to 2.5%. The paper thus prepared is ready for the high vacuum metallization process. In this case, we observe an incorrect fluid flow in the “curtain” and the formation of “spurs” at the point of application. After metallization, areas with a very thin film are visible.

Claims (16)

1. A method of manufacturing metallized paper, comprising the following stages: I) applying to the substrate a first aqueous film-forming composition comprising a first polymer in the form of an emulsion and / or a second polymer in the form of a colloidal dispersion; Ii) metallization of the obtained coated substrate; and III) applying to the aforementioned metallized substrate a second aqueous film-forming composition comprising a first polymer in the form of an emulsion and / or a second polymer in the form of a colloidal dispersion; characterized in that the aforementioned first and second aqueous film-forming compositions are applied by pouring. 2. The method according to claim 1, where the aforementioned first and / or second aqueous film-forming compositions have a viscosity at a low shear rate, measured using a Brookfield viscometer at 60 rpm and 20 ° C, which is from 60 to 220 MPa, and / or viscosity at high shear rate, measured using a Haake viscometer at 37750 s ^-1 and 20 ° C, which is from 2.3 to 35 MPa. 3. The method according to claim 1, where the aforementioned first and / or second aqueous film-forming compositions have a viscosity at a low shear rate, measured using a Brookfield viscometer at 60 rpm and 20 ° C, which is from 100 to 180 MPa, and / or viscosity at high shear rate, measured using a Haake viscometer at 37750 ^-1 and 20 ° C, which is from 7 to 20 MPa. 4. The method according to claim 1, where the first and / or second aqueous film-forming compositions have a static surface tension, measured by a ring tensiometer, which is from 25 to 40 dyne / cm, preferably from 32 to 37 dyne / cm. 5. The method according to claim 1, wherein the above first polymer is selected from acrylic polymers, acrylic-styrene polymers, modified acrylic polymers and mixtures thereof. 6. The method according to claim 1, wherein the aforementioned second polymer in the form of a colloidal dispersion is selected from acrylic polymers, modified acrylic polymers and mixtures thereof. 7. The method according to claim 1, wherein the aforementioned first and / or second aqueous film-forming compositions comprise a first polymer in the form of an emulsion in an amount of from 10 to 70% by weight of the total resin based on dry matter and a second polymer in the form of a colloidal dispersion in an amount of from 30 to 90 wt.% of the total weight of the resin based on the dry matter. 8. The method according to claim 1, wherein the above first and / or second aqueous film-forming compositions also include an additive selected from thickeners, surfactants, waxes, pigments, defoamers, dispersing agents, leveling agents and mixtures thereof. 9. The method of claim 8, wherein the above first and / or second aqueous film-forming compositions include a thickener in an amount of from 2 to 5 wt.% Of the total weight of the resin based on dry matter. 10. The method according to claim 8, in which the above thickener is selected from the group formed by acrylic thickeners, polyurethane thickeners, acrylamide thickeners, cellulose thickeners and mixtures thereof. 11. The method according to claim 8, in which the aforementioned first and / or second aqueous film-forming compositions include a surfactant in an amount of from 0.5 to 3 wt.% Of the total weight of the resin based on the dry matter. 12. The method of claim 8, wherein the above surfactant is selected from the group formed by anionic, nonionic surfactants and mixtures thereof. 13. Composition for the manufacture of metallized paper by filling, comprising a first polymer in the form of an emulsion and / or a second polymer in the form of a colloidal dispersion and having at least one of the following properties: i) the viscosity at a low shear rate, measured with a Brookfield viscometer at 60 rpm and 20 ° C, is from 60 to 220 MPa, preferably from 100 to 180 MPa; ii) the viscosity at high shear rate, measured using a Haake viscometer at 37750 s ^-1 and 20 ° C, is from 2.3 to 35 MPa, preferably from 7 to 20 MPa; or iii) the static surface tension measured by the ring tensiometer is from 20 to 40 dyne / cm, preferably from 32 to 37 dyne / cm. 14. The composition according to item 13, which also includes an additive selected from thickeners, surfactants, waxes, pigments, defoamers, dispersing agents, leveling agents and mixtures thereof. 15. The composition according to 14, which includes a thickener selected from the group formed by acrylic thickeners, polyurethane thickeners, acrylamide thickeners, cellulose thickeners and mixtures thereof. 16. The composition according to 14, which includes the above surfactant selected from the group formed by anionic, nonionic surfactants and mixtures thereof.