RU2624188C2 - Polymeric basis covered with glue material with low stickiness - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer base on which a UV curable adhesive material comprising a polymeric support is applied, at least in part of which a certain amount of particles of the adhesion enhancing filler is dispersed. At least a portion of the reinforcing filler particles sticking provides enhanced adhesion between the UV-curable adhesive material and the polymeric substrate.

EFFECT: improved properties of the polymer base.

20 cl, 14 dwg, 19 tbl, 11 ex

Description

Technical field

The present invention relates generally to low-adhesive self-adhesive materials, and more particularly, to low-adhesive self-adhesive materials applicable in packages.

State of the art

The present invention relates generally to polymer substrates on which adhesive materials with low tack are applied, more specifically, to adhesive materials with low tack having enhanced adhesion to polymer substrates,

Several types of closures or fasteners are known for resealing previously opened packaging. For example, it is customary to use mechanical resealable clips, such as zippers, clips, tabs, connectable strips, etc. These mechanical closures can be cumbersome complex structures that require separate molding and assembly steps before they are attached to the packaging. In addition, the film in rolls and other packaging materials that use such clamps can become heavy and difficult to handle due to the increase in volume due to the clamps. In addition, such clamps can significantly increase the cost of materials and packaging costs. Mechanical retainers may also not provide an airtight seal after capping. For example, when the zippers are in the closed position, they may have an undesirably small air channel or clearance due to closing of the joined edges between the end stop and the slider. These mechanical fasteners can be used in molding-filling-capping operations, but this may require complex stages of the manufacturing process to install, connect and align elements of this design. For this reason, mechanical, resealable clamps can unjustifiably increase the degree of complexity, increase the costs and costs of manufacturing such packages.

One alternative to the mechanical fasteners discussed above is re-closable adhesive fasteners. Nevertheless, adhesive-based fixators create other difficulties both in their manufacture and creation. For example, for the manufacture of fixatives based on re-corkable self-adhesive material (SCM), thermoplastic elastomers (TEC) are used, which are sometimes called thermoplastic rubber. TEP copolymers of certain types (in particular, some styrene block copolymers) have good cohesive properties and at the same time low tack or a reduced tendency to adhere to dissimilar materials. TECs can be useful for creating resealable fasteners, however, such TECs usually have undesirably strong cohesive properties, which makes it difficult to use them as a resealable fastener for packages, since they are able to delaminate at the border with the package substrate and not at the adhesion boundary. In addition, TEC may need to be dissolved so that they can be applied to the packaging substrate in the transverse or longitudinal direction in the form of an alternating structure. In some cases, organic solvents useful as a carrier for TEC may not be suitable for contact with food. It was proposed to apply TEC in the form of an aqueous dispersion by stencil, however, obtaining aqueous dispersions of TPE, applicable for flexographic or rotational intaglio printing, is difficult from a technical point of view. Even if a technically feasible method of dispersing TPE in water were created, applying TPE aqueous dispersions to a screen would not be industrially feasible for consumer packaging produced in large volumes due to the high cost of removing the aqueous carrier after coating.

Other types of self-adhesive materials (SCMs) can be used as re-curable fasteners for packaging, however re-curable fasteners based on conventional SCMs generally have high tack. Stickiness is a property of an adhesive material, which generally allows the material to adhere to the surface of another material with short or light pressure. Adhesion is often considered a characteristic of rapid adhesion, initial adhesion or quick setting of the material. Conventional SCMs in general cannot be applied to the surface of materials that are intended for use on industrial equipment to form packages. Typical difficulties encountered when trying to use materials with SCM applied on their surface on packaging equipment include: seizing when the material does not freely unwind from a roll due to unacceptable adhesion on the back; grabbing when unwanted and unintentional transfer of adhesive material occurs on the surface of equipment such as rollers, mandrels, and filling tubes; poor mating, such as the inability of the material to maintain accurate orientation when passing through a packaging machine; and jamming when the material is not able to slip on the surfaces of the equipment and gets stuck.

SCM-based resealable fasteners can also be inconvenient for consumers using shaped packaging. If the package contains crumbled (i.e. cookies, crackers, etc.) or crushed product (i.e. crushed cheese, etc.), due to the high stickiness of most SCMs, crumbs or particles of the product may adhere to SCM , which impairs the ability of SCM to form a sufficient closure due to contamination of its surface with a food product. The SCM-based latch, which is heavily contaminated with the product, will usually not serve as a sufficient closure, since crumbs adhering to the SCM generally do not allow SCM to adhere to the other side of the package.

Less sticky SCMs that act as cohesive materials create other inconveniences. Less tacky adhesive material can hardly adhere to the surface of the package due to its low tack properties. Thus, in the case of fixators with lower SCM stickiness, SCM may peel off the surface of the package after opening the package.

SUMMARY OF THE INVENTION

The invention provides a polymer base on which a UV-cured adhesive material with a low stickiness is applied, having enhanced adhesion strength. According to one of the features of the invention, the polymer base contains a polymer substrate, at least in part of which a certain amount of particles of an adhesion enhancing filler are dispersed, and a UV-cured adhesive material with a low stickiness is applied to the polymer substrate. According to another aspect of the invention, at least a portion of the adhesion enhancing particles are at least at the interface between the polymer substrate and the low viscosity UV cured adhesive material, thereby providing increased primary adhesion strength of the low cured UV cured adhesive material and the polymer substrate, at least about 600 grams per linear inch.

Brief Description of the Drawings

Figure 1 shows a perspective view of one example of a flexible packaging with a resealable adhesive-based latch, illustrated open,

on figa shows a perspective view of a second variant of implementation of one of the examples

packaging with a resealable adhesive-based latch, illustrated as closed,

on figv shows a perspective view shown in figa packaging, illustrated open,

on figa shows a perspective view of a third variant of implementation of one example of a rigid packaging with a resealable latch based on adhesive material,

FIG. 3B shows a perspective view of a fourth embodiment of one example of packaging with a pivoting lid and a resealable adhesive-based latch,

FIG. 3C shows a perspective view of a fifth embodiment of one example of a rigid packaging with a resealable adhesive-based latch,

figure 4 shows a view in cross section of one example of a resealable latch based on adhesive material,

on figa shows a view in cross section of a resealable latch based on adhesive material, illustrated open, while the package is full,

FIG. 5B is a partial cross-sectional view of the re-closure latch of FIG. 5 based on an adhesive material, illustrated as being closed,

FIG. 6 shows one example of a process for applying a resealable adhesive-based fixative to a packaging substrate,

Fig. 7 shows one example of a packaging process using a resealable adhesive-based latch,

FIG. 8 is a cross-sectional view of another example of a resealable adhesive-based retainer and

Figures 9 and 10 show examples of processes for manufacturing packages with a resealable adhesive-based retainer.

DETAILED DESCRIPTION OF THE INVENTION

Next, a resealable fastener based on a low adhesive adhesive material and a packaging in which the fastener is used will be described. The latch has opposing layers, sections or structures of adhesive material with low stickiness, which releasably adhere to each other and close the package. The latch adheres to the packaging substrate with sufficient force so that the opposing adhesive layers do not peel off the packaging substrate when it is open, even if the adhesive material has a low stickiness. The adhesive material used to create the retainer also has a relatively high adhesive strength, but at the same time a relatively low stickiness, due to which it is able to function as an effective re-stopper retainer even when exposed to crumbs, fluffs, particles, etc. Opposite adhesive layers can be applied to a variety of substrates, such as packaging materials, including, for example, film, paperboard or other paper products, cardboard, foil, metal, laminate, flexible, rigid or semi-rigid plastic products, or combinations thereof. Similarly, these materials can be used to create a variety of packaging or containers, including, for example, flexible bags or sacks, cardboard packaging or boxes, envelopes and double-leaf packaging, just to give a few examples.

According to one of the features of the invention, the adhesive-based resealable fastener and / or the packaging substrate are generally designed or have a composition such as to minimize the adhesion of the fastener to unwanted surfaces and act as an effective resealable fastener that does not peel off . In other words, the adhesive-based fastener and / or the packaging substrate have a unique composition or design that provides selected stickiness and peeling values so that the adhesive-based fastener can be repeatedly opened and closed to seal the contents of the package during use by the consumer , but at the same time, so that it does not peel off from the opposite elements of the packaging substrate. To this end, the resealable fastener typically contains a UV-cured adhesive material having a relatively low tack to minimize adhesion to unwanted surfaces, a selected adhesive force or peeling strength upon opening, sufficient to ensure reliable re-closing of the package, and sufficiently stable peeling resistance. to ensure multiple opening and resealing of the package. At the same time, the latch also has strong adhesion to the packaging substrate, due to which the adhesive material does not peel off after opening the latch in order to access the contents of the package. In one approach, a re-curable adhesive-based fastener may contain specific mixtures of a UV-cured acrylic oligomer and a tack-control material. According to other approaches, a re-curable adhesive-based fixative comprises special mixtures of at least one UV-cured acrylic oligomer, at least one tackifying material, and at least one elastomer (rubber).

According to one approach, the UV cured adhesive re-curable fastener is a UV cured self-adhesive material (SCM) having cohesive properties and low tack, but despite its low tack, which provides strong adhesion to the packaging substrate, which forms opposite packaging elements. It is generally understood that a cohesive material generally adheres more readily to similar materials (i.e., has autohesion) than to dissimilar materials. Applicable adhesive materials used in the invention generally have a relatively low ability to adhere to undesirable surfaces, but at the same time they have good adhesion to desirable surfaces (i.e., do not peel off from opposing elements) and relatively good cohesive properties or adhesion to autogesia account with similar surfaces to keep the package or bag closed, but at the same time provide the ability to open or open the package manually. Selected adhesive materials also provide the ability to detach or peel from such similar materials so that the adhesive layers can be repeatedly separated without significant damage to the adhesive material and / or underlying packaging substrate. When the adhesive material is detached or peeled off, the selected adhesive materials, due to sufficient internal integrity, are generally predominantly neatly peeled off at the adhesion border of the adhesive material without significant grip of the material, ductility, peeling from the packaging substrate and (or) other significant material distortions (i.e., clumping) , pilling, etc.). Adhesive-based fasteners described in the invention advantageously retain adhesion upon peeling if the average amount of adhesion upon initial peeling of opposing opposing adhesive strips exceeds about 200 grams per linear inch (g / ld), in some cases from about 200 g / ld to about 900 g / ld In addition, in some cases, after five repeated capping and uncapping operations, adhesive-based fasteners retain adhesion upon peeling, exceeding about 200 g / ld and (or) amounting to at least about 30% to about 200% of the average adhesion value at the first peeling.

According to another aspect of the invention, the adhesive-based fastener packaging is also designed in such a way that the adhesive force or peeling resistance of the UV-cured adhesive re-sealable fastener from the packaging substrate generally exceeds the peeling resistance of the layers of the fastener itself upon opening. Thus, the resealable retainer generally remains adhered to the package substrate and does not entrain, stretch or peel off the package substrate when the consumer opens the package and opens the retainer. For example, according to one approach, the adhesive material has a primary adhesion force or resistance to peeling from the packaging substrate of more than about 600 g / ld (in some cases, more than about 900 g / ld) and is able to withstand many cycles of uncorking and resealing without detaching from the film substrate. In addition, since the adhesive material is curable, it is able to withstand more than 100 double abrasions using a methyl ethyl ketone (MEK) solvent.

Turning to the drawings, in particular, FIGS. 1-3, which generally illustrates one example of a package 10 with a resealable latch 12 based on a UV-cured adhesive. Packaging can be flexible packaging, such as bags, sachets, sachets, etc., as well as rigid packaging, such as boxes, cardboard packaging, envelopes, etc. In general, a package has a plurality of walls that form a cavity to accommodate one or more products, such as food products. According to some approaches, the package additionally has opposing backing elements that can be connected to each other to restrict or block access, keep the contents and / or keep it fresh. The described adhesive-based fastener having opposing adhesive portions may be located on opposing elements and allow for repeated closure of the package. In this case, the user can separate the opposite elements and the opposing adhesive areas located on them in order to gain access to one or more products placed in the cavity. The user can then connect the opposite elements to each other, for example, by moving the elements towards each other or rotating one or both elements relative to each other and gently pressing so that the opposite adhesive sections stick to each other, as a result of which the packaging is again sealed. These operations of opening and resealing can be carried out several times, while the loss of adhesive force of the lock is from minimal to zero.

Figures 1 and 2 generally illustrate a flexible package that uses a latch 12 based on adhesive material. FIG. 1 shows a package 10 that is open, and FIG. 2A generally illustrates a package 10 that is closed or sealed. FIG. 3A generally illustrates a package 10 in the form of a stiffer casement type box suitable for packaging one or more products, such as chewing gum plates. FIG. 3B shows a box or cardboard box with a latch 12 based on adhesive material, and FIG. 3C shows an envelope or paper bag using a latch 12 based on adhesive material. It should be noted that FIGS. 1-3 illustrate examples of packages, and if necessary, packages of other types, sizes and configurations can also be used.

In general, the packages 10 shown in FIGS. 1-3 are made of one or more sections, elements or pieces of material or substrate 14, from which opposite front and rear elements, walls, and the like are formed. (shown in the drawings as elements 16 and 18). Opposite walls also have opposite sections or structures of adhesive material 30 and 32 located on them. At the same time, as indicated above, the package may have various shapes with various configurations or holes for re-capping with a resealable latch 12, in particular, opposite sections or structures of adhesive material 30 and 32.

In the example illustrated in FIGS. 1 and 2, the package 10 may also include a crease-resistant crease 20 extending along its lower edge 22 and transverse or side seals 24 extending along its lateral edges 26, as a result of which between the front element 16 and the rear element 18 of the package 10 forms a cavity 28 to accommodate the product, such as a component of a food product, food product or other product. The package 10 may further comprise an upper seal 23 (FIG. 2A) located above the resealable adhesive-based latch 12 when the package 10 is in an upright position. It should be noted that the shape of the package 10 is illustrated only as one example of several types of packages suitable for use with a resealable latch 12 based on adhesive material. As indicated above, containers / packages of other shapes, with other configurations, and from other materials can also be used in combination with a resealable adhesive-based latch 12. The package 10 may additionally contain other folds, seals, wedges and / or valves, which are usually necessary for a particular application. Instead of the crease 20, the package 10 may also comprise a lower seal on the lower edge 22. The package 10 may also optionally contain re-sealable seals 11 (shown, for example, in FIGS. 1 and 2A) that are located above or below the resealable latch 12, as generally described in the application US 11/267174, the contents of which in their entirety by reference are included in this application. In addition, the package 10 may also optionally contain a breaking line 13 of the least resistance (FIG. 2A) between the resealable latch 12 and the upper edge of the package 10, after a complete rupture of which the portion of the upper edge of the package 10 is removed and a removable shell 15 forms over the resealable latch 12 providing opening of the package, as shown in figb.

Refer to FIG. 4, which illustrates one form of a resealable latch 12 based on adhesive material that has opposed adhesive layers or adhesive portions 30 and 32, of which layer 30 is on the front member 16 and layer 32 is on the rear member 18 The retainer layers 30 and 32 are generally aligned with each other so that the outwardly facing surfaces 34 and 36 of each layer 30 and 32 are respectively opposed to each other and are preferably in contact with each other in a closed or sealed floor Due to the mutual adhesion of the layers 30 and 32. The adhesive layers 30 and 32 are preferably located on the outer or inner surfaces of the front element 16 and the rear element 18, as shown in FIGS. 4, 5A and 5B. Alternatively, in packages of other shapes, adhesive layers 30 and 32 can optionally be provided on opposite portions of the casement container (FIG. 3A), on overlapping valves (FIG. 3B), on the package body and lid valve (FIG. 3C ) or on other surfaces of the packaging. As shown, the shape, arrangement and configuration of the layers 30 and 32 can be changed as desired or taking into account the requirements of a particular application. Adhesive sections 30 and 32 may also be provided in the form of alternating shapes, structures, lines, which can be regularly or irregularly spaced into the packaging elements.

Preferably, each of the opposing adhesive layers 30 and 32 can be used in the form of a coating liquid mixture that can be heated to a moderately warm temperature, such as about 160 ° F (71 ° C), but also in the range of about 86 ° F ( 30 ° C) to about 190 ° F (88 ° C), and applied to the substrate. After coating, the mixture, which may contain the photoinitiator added to it, can be subjected to ultraviolet irradiation in order to cure (polymerize) the coating and form a solid adhesive 12 based on adhesive material on the packaging substrate. According to one aspect of the invention, the thickness of the coating may be about 0.0005 inches, but may range from about 0.0001 inches to about 0.005 inches; however, depending on the design, configuration, and packaging requirements, the thickness of the coating may be significantly greater. According to one approach, the coating mixture does not contain or predominantly does not contain solvents that must be removed, and can be easily applied to the packaging substrate on high-speed production lines for coating and printing.

The first component of the adhesive material is one or more components including UV curable acrylate or acrylic oligomers. For example, the UV curable acrylic oligomer may be an acrylic or methacrylic acid ester containing a plurality of reactive or functional groups (i.e., acrylic or methacrylic oligomers). Typically, the functional group has one UV-responsive site. According to one approach, UV-responsive sites are most often carbon-carbon double bonds conjugated to another unsaturated site, such as an ester carbonyl group. According to one approach, the UV curable acrylic oligomer is an ester of acrylic or methacrylic acid containing many functional alcohol groups, which means that the main chain of the oligomer contains several acrylic or methacrylic hydroxyl groups. In one approach, the adhesive material may contain from about 1% to about 90% by weight of UV curable acrylic oligomers and have from about 1.2 to about 6.0 functional groups. In another approach, UV curable acrylic oligomers can have from about 2.0 to about 3.0 functional groups. According to other approaches, the adhesive material may contain from about 20% to about 70% by weight (in some cases from about 33% to 60% by weight) of acrylic oligomers.

In one embodiment, the multi-functional UV curable acrylic acid ester is a vegetable oil acrylic acid ester containing 2.0 or more reactive functional groups. According to another aspect of the invention, the UV curable acrylic oligomer may comprise epoxidized soybean oil acrylate. Typically, the amount of UV curable acrylic oligomers used, taking into account the adhesive component ratio (CCM) (to be discussed later), can affect the properties of the final adhesive material. For example, if the amount of UV-curable acrylic oligomer is too small given the preferred CCM, the cure rate of the final adhesive material is too low. On the other hand, if the amount of UV-cured acrylic oligomer is too large, taking into account the preferred CCM, the final adhesive can be satisfactorily cured, but may have poor auto-adhesion properties when sealing and re-sealing.

The second component of the adhesive material is a tackifier. In one approach, the adhesive material may contain from about 1% to about 65% by weight of the tack adjusting material. According to another approach, the tackifier may be present in an amount of from about 20% to about 65%. The tackifier may contain a tackifying resin or a curable polymer / monomer combination which, upon curing, is capable of providing the desired tack levels and auto-adhesion properties acceptable for the resealable fixative 12. According to one aspect of the invention, the tackifier may be an aliphatic urethane-acrylic oligomer . Many other types of tack control materials suitable for UV-curable SCM can also be used in the resealable adhesive system.

An optional third component of the adhesive material is at least one elastomer or rubber. According to one approach, the elastomeric component may contain at least one curable acrylic (i.e., modified acrylic) or methacrylic ester, hydroxyl terminated polyester elastomer (i.e., elastomeric polyol). This elastomeric component may contain modified acrylic polybutadiene, saturated polybutadiene and / or flexible polyurethane. According to one aspect of the invention, methacrylic polybutadiene can be used. The elastomeric material may be contained in an amount of from about 0% to about 20% when used in an adhesive material. According to one aspect of the invention, the elastomeric material is used in an amount of from about 5% to about 15%. Satisfactory adhesive materials with the desired low tack and re-capping properties described in the invention can be obtained without the use of an elastomeric component; however, it is believed that the elastomeric component contributes to optimal hiding characteristics. The optimum hiding characteristics of the adhesive material can be determined by properties such as autohesion, stickiness, toughness and cure rate, just as a few examples. The elastomeric component serves to control the properties of peeling resistance, adhesion to the substrate, increase flexibility, regulate viscosity and modulate the cure speed. It was found that to balance the peeling, stickiness and adhesion to the packaging substrate, three components of the adhesive material, i.e. the acrylic oligomer, the elastomeric component, and the tack adjusting component must be contained in amounts corresponding to a particular ratio of adhesive components (i.e., CCM). Preferably, the CCM for the adhesive material is:

In one preferred embodiment, the CCM can range from about 0.8 to about 1.5.

It was found that the range of CCMs of the three constituent components provides a unique composition of an adhesive material that has the property of low stickiness with respect to dissimilar substances (i.e., equipment components, crumbs, food pieces, etc.), but at the same time capable of self-sealing with sufficient adhesion or peeling resistance to provide sealing and also to prevent contamination. The adhesive material with this particular CCM also provides a re-capping function in which its capping-uncapping-re-capping properties are not significantly weakened or lost during multiple opening and capping operations. A CCM of less than about 0.5 is usually undesirable, since curing the adhesive would require significantly more UV energy. If the CCM exceeds about 1.5, the adhesive material will quickly cure, but will also have low (or zero) peeling resistance, which is not acceptable for the adhesive closure of the invention. In addition to the required range of CCMs, in some cases an adhesive material with a satisfactory composition may have some other parameters, such as the stability of the mixture of components, a certain viscosity of the composition, a certain curing rate and (or) a certain peeling resistance.

In addition to the desired CCM, the adhesive components must also be compatible with each other in order to form a stable fluid mixture. In the context of the present invention, it is believed that the adhesive material is stable if it (at least two of its three main components) remains a homogeneous liquid, i.e. without visible phase separation of the components and gelation when stored at room temperature (about 70 ° F-75 ° F) for up to three days.

In addition, the adhesive may have a viscosity of about 10,000 to about 50,000 centipoise (cP) or less when stored at room temperature or about 2000 cP or less at a temperature of about 160 ° F (71 ° C), and in some cases about 200 cP or less at a temperature of about 160 ° F (71 ° C). In this viscosity range, the adhesive material can be applied to the film substrate by conventional printing, by means of a roller, by spline extrusion methods or other applicable methods according to the requirements of a particular application.

In order to obtain a sufficiently cured adhesive layer on the film substrate, the adhesive material can be cured using UV sources capable of transmitting energy from about 100 mgJ / cm ² to about 800 mgJ / cm ² . This in turn helps to ensure a sufficient degree of cure of the adhesive material, which when tested for abrasion resistance using MEK (ASTM D5402-06) is about 100 or more double abrasions (which is discussed in more detail below).

The average amount of adhesion during the initial peeling off of a properly cured adhesive material can range from about 200 g / ld to about 900 g / ld, in some cases from about 280 g / ld to about 800 g / ld, and in other cases from about 280 g / ld to about 650 g / ld as measured by method F according to ASTM D3330 / D3330M-04. The adhesive material is also designed to maintain its average peeling value after repeated opening and closing operations (i.e., adhering to adhesion). Preferably, the cured adhesive material is capable of maintaining an average adhesion value upon initial peeling of from about 280 g / ld to about 800 g / ld for at least five repeated uncorking-resealing cycles. This is called a sticking rate. Preferably, the adhesion retention rate after peeling-resealing-peeling can be from about 30% to about 200% of the original adhesion retention rate. The adhesion retention rate after contamination of the adhesive material with a cracker can be from about 30% to about 150% of the initial value, the test method for pollution by cracker is described below. According to some approaches, a UV photoinitiator can be added to the adhesive material to help initiate the curing process. A photoinitiator may be used in an amount of from about 0.1% to about 5%. According to one aspect of the invention, the photoinitiator may comprise a mixture of benzophenone derivatives and a synergist compound. A synergist compound is a compound that interacts with excited benzophenone molecules, resulting in the formation of free radicals by electron transfer and hydrogen removal. One example is a mixture containing trimethylbenzoyl diphenylphosphine oxide, α-hydroxyketones and benzophenone derivatives, wherein the synergist compound contains the first two of these compounds. According to another example, the α-hydroxyketone itself is the photoinitiator. According to another aspect of the invention, the photoinitiator may contain onium salts or other acidic materials activated by UV radiation. A binder consisting of cationic substances such as epoxides, vinyl esters and the like can be used. They may optionally be crosslinked with resins that have been functionalized using carboxylic acid, hydroxyl or other nucleophilic groups.

In one embodiment, the packaging substrate 14 may be a flexible sheet material or film, which may consist of various polyplastics, copolymers, foils, or combinations thereof. The film substrate may be a multilayer extrudate and / or layered material with structures that enhance adhesion at the interface with the latch 12 based on UV-cured adhesive material. Typically, the polymer layers may contain polyolefins, such as polyethylene (high, medium, low density polymers, linear low and / or ultra low density polymers, including metallocene or polypropylene (oriented and (or) biaxially oriented)); polybutylene; ethylene vinyl acetate copolymer (EVA); polyamides such as nylon; polyethylene terephthalate; polyvinyl chloride; a copolymer of ethylene and vinyl alcohol (EVOH); polyvinylidene chloride (PVDC); polyvinyl alcohol (PVOH); polystyrene or combinations thereof in single-layer or multi-layer combinations. According to one aspect of the invention, the film substrate comprises EVA. In one approach, the film substrate may have a thickness of from about 0.5 mils (thousandths of an inch) to about 5 mils. Examples of applicable film substrates are given in US applications 2008/0131636 and 2008/0118688, the contents of which are incorporated by reference in their entireties by reference.

According to one approach, the packaging substrate 14 may be a single layer or multi-layer film. A multilayer film according to one example may have an internal thermally adhesive (sealing) layer, to which an adhesive fastener 12 and one or more structural and (or) functional layers are attached. In one particular example, the packaging substrate 14 may comprise an inner sealing layer and an outer structural layer comprising one or more layers of high density polyethylene and (or) one or more layers of nylon. The inner sealing layer may contain several polymers and (or) polymer blends. According to one approach, the packaging substrate 14 and / or the inner sealing layer may comprise mixtures of ethylene vinyl acetate (EVA) copolymer, polyethylene (such as linear low density polyethylene (LLDPE)) and dispersed particles of one or more optional adhesion enhancing fillers that will described in more detail below. For example, the inner seal layer may contain from about 60% to about 80% EVA, from about 5% to about 20% polyethylene, and from about 3% to about 15% particles of an adhering filler or particle containing filling composition. Such a structure can form a polymer dispersion in which EVA can be a primary or continuous phase in which polyethylene and a filler / filler composition are contained in the form of a dispersed phase. According to this approach, the adhesive-based latch 12 is applied to the inner sealing layer, which forms the inner surface of the package 10. According to another approach, the multilayer film may contain many layers, with about 85% of the total film thickness being high density polyethylene and about 15% sealing layer.

According to another approach, the packaging substrate may be cardboard or a similar material coated or coated with a polymer layer. The coating or polymer layer may contain a copolymer of ethylene and vinyl acetate (EVA), polyethylene and mixtures thereof. This coating or layer may contain the fillers described above, as well as fillers contained in a carrier based on maleic anhydride grafted linear low density polyethylene (MA-LLDPE), described below.

In one embodiment, the implementation of the packaging substrate 14 comprises a structure for enhancing the primary adhesion or adhesion force at the interface between the adhesive material and the packaging substrate 14. To this end, according to one approach, the packaging substrate may comprise adherence enhancing particles of the filler mixed with at least a portion of the packaging substrate 14, such as, for example, the adherence enhancing particles of the filler mixed with the inner sealing layer of the film described above. According to one approach, the particles of enhancing adherence of the filler may be micro- or nanoparticles of clay, calcium carbonate, montmorillonite, microcrystalline silica, dolomite, talc, mica, oxide (silicon oxide, aluminum oxide, titanium oxide, etc.) and other additives and (or) combinations thereof, forming a mixed at least internal sealing or surface layer (s) of the packaging substrate to increase the primary adhesion force of the adhesive fastener 12 with the packaging substrate 14. In particular, organoclay is used, and in one embodiment, the organoclay is organically modified montmorillonite or, in some cases, stratified organoclay. An organoclay is an organically modified natural clay, such as montmorillonite clay, that has been treated or purified with surface active materials, such as quaternary ammonium salts. Montmorillonite belongs to the phyllosilicate group of clay minerals and usually contains aqueous sodium-calcium-magnesium aluminosilicate. Without being bound by any limiting theory, an organo-clay-filled substrate, and in particular organ-modified fillers, can contribute to the production of effective, resealable adhesive-based closures that do not peel off the packaging substrate 14 after uncorking.

According to some approaches, the applicable adhesion enhancing particles of the filler have a specific surface area of more than about 100 m / gram and an aspect ratio of more than about 10. According to other approaches, the organoclay used in the sealing layer typically contains a plurality of particles. In one embodiment, the organoclay comprises a plurality of particles having at least one spatial dimension of less than about 200 nm. In another embodiment, the organoclay comprises a plurality of particles having at least one spatial dimension of less than about 100 nm. In yet another embodiment, the organoclay comprises a plurality of particles having at least one spatial dimension of less than about 50 nm. In yet another embodiment, the organoclay comprises a plurality of particles having spatial dimensions greater than or equal to about 1 nm. In yet another embodiment, the organoclay comprises a plurality of particles having spatial dimensions greater than or equal to about 5 nm. In another embodiment, the organoclay comprises plates whose average distance between them is at least about 20 angstroms. In yet another embodiment, the organoclay comprises plates, the average distance between which is at least about 30 angstroms. In yet another embodiment, the organoclay comprises plates whose average distance between them is at least about 40 angstroms. Typically, before mixing with a thermoplastic polymer, the organoclay contains plates whose average distance between them is from about 20 to about 45 angstroms. After mixing with the substrate or at least its sealing layer, the organoclay preferably goes into a dispersed state, as a result of which the average distance between particles is maintained or, in some cases, increases.

Effectively dispersing clay particles or other adhesion-enhancing fillers in polyethylene and EVA, which are used in the sealing layer, can be challenging due to incompatibility of clay-based fillers and some polymers. Thus, the use of particles of an adherence enhancing composition containing a filler mixed with a compatible carrier helps to mix and disperse the filler into the sealing layer of one of the forms of the packaging substrate 14. According to one approach, the particles of enhancing the adhesion of the filler may be contained in a carrier based on maleic anhydride grafted linear low density polyethylene (MA-LLDPE). According to another approach, the carrier may be a mixture of MA-LLDPE and unmodified polyethylene. Without being bound by any limiting theory, the maleic anhydride contained in the carrier has an affinity for filler particles such as clay, and the polyethylene contained in the carrier mixes well with other polymer components of the sealing layer or substrate 14. The clay based fillers produce , for example, PolyOne Corporation (Avon Lake, Ohio, USA). Without being bound by any theory, it is believed that organically modified clay particles that can be highly polarized and / or a carrier resin based on maleic anhydride grafted linear low density polyethylene (MA-LLDPE) contained in clay based fillers contribute sticking of the cured adhesive material coating to the surface of the substrate by increasing the surface energy of the substrate layer.

In addition, it is also assumed that at the microscopic level, clay particles or other adhesion enhancing fillers can increase the surface roughness of the substrate and thereby positively affect the friction coefficient of the substrate and increase the available contact surface area between the substrate and the adhesive material, resulting in an increase in the number of chemical and / or mechanical clutch. This will be discussed in more detail with reference to FIG. According to one approach, it is assumed that the filling composition contained in the sealing layer in an amount of from about 0.5% to about 20% by weight has a positive effect on the primary adhesion force of the adhesive retainer 12 with the packaging substrate 14 so that the primary adhesion force with the substrate exceeds adhesion during peeling of the adhesive layers 30 and 32, and the latch 12 does not peel after opening. In addition, the filler or particles can roughen the surface of the substrate layer so that it can freely slide on the metal surfaces of the packaging equipment without adhesion with them, which reduces or eliminates the use of a slip improver in the film. According to some approaches, the filler-containing inner sealing layer has a higher surface roughness, for example, an average roughness of from about 1500 angstroms to about 5000 angstroms. The sealing layer may also have a higher tensile modulus than non-filler layers. According to some approaches, the inner sealing layer has a tensile modulus of from about 500 to about 2000 MPa.

An optional component of the packaging substrate 14 may contain a migratory slip improving additive that helps to reduce the coefficient of friction between the film and other surfaces, whereby the substrate can slide freely over metal or intrinsic surfaces. According to one aspect of the invention, a slip improving additive based on erucamide (i.e., primary amide of unsaturated fatty acids) can be used. In films known from the prior art, slip additives are used in large quantities from 2000 ppm to 7000 ppm, but it has been found that with such a high content, the adhesive 12 is difficult to adhere to the low energy surface of the film because the slip improver blocks surface areas on which adhesion may occur. However, by using a filler, the amount of slip improver used can be significantly reduced, for example, to less than about 1000 ppm. In other cases, the film contains less than about 700 ppm glide improver, or in other cases does not contain glide improver. Since the friction coefficient between the film and other surfaces is reduced due to the use of filler, that is, the effect is achieved previously achieved by the use of a slip improver, the slip improver can be used in a lower concentration or not be used. By using a glidant additive in a smaller amount than usual, it is also possible to enhance the adhesion of the cured coating to the substrate, both initial and over time, since the amount of the additive that interferes with the adhesion of the coating to the substrate is reduced. Without regard to any limiting theory, it is assumed that the fatty acid amides contained in the glide improvers, which are low molecular weight components, are able to migrate to the film surface, affecting the adhesion between the film surface and the adhesive fastener 12. Although by corona treatment or fire of processing, you can initially burn any fatty acid amides on the surface of the film and thereby provide an initial high adhesive strength of the adhesive material, since When additional fatty acid amides can migrate to the film surface, the adhesion strength decreases over a long shelf life. In addition, large amounts of glidant can also migrate to areas of the surface of the adhesive material, which can adversely affect the strength and adhesion between them.

In addition, prior to applying adhesive material to the packaging substrate 14, the surface of the substrate may be pretreated in order to increase surface energy and / or apply a primer layer. For example, surface treatment may include corona treatment, plasma treatment, fire treatment and the like, or chemical coatings such as primers or adhesion promoters may also be used. During corona treatment, the surface energy of the substrate can increase, which improves the ability of the coating to adhere and remain adhered to the substrate. Corona pretreatment can include an ion cloud treatment that oxidizes the surface and makes it susceptible to coating. As a result of pretreatment with a corona discharge, oxidation of the reactive sites of the polymer substrate mainly occurs. In the case of corona treatment, ideally, the surface energy after treatment should be about 36-40 dyne / cm or more at the time of coating.

Without being bound by any theory, it is believed that corona treatment of the surface of the substrate helps to ensure strong adhesion between the coating layer and the surface of the substrate due to an increase in the surface energy of the substrate. In addition, corona treatment in combination with a low concentration of the slip improver and the use of a filling composition in the film substrate 14 provides strong adhesion between the resealable retainer and the substrate.

Regarding the coating method, the liquid coating composition can be heated to a specific temperature from about 86 ° F (30 ° C) to about 190 ° F (88 ° C), preferably from about 120 ° F (49 ° C) to about 160 ° F (71 ° C) so that it has a sufficiently low viscosity to apply coating packaging onto the substrate 14 by screen flexographic printing, rotogravure, or splined printing. As indicated above, the packaging substrate 14 may contain a filler dispersed therein (at least in some areas or layers) and less than about 1000 ppm, which improves the sliding of the additive contained in the polymer film substrate. After applying the liquid composition to the substrate, it can be cured by ultraviolet radiation, resulting in the formation of a solid re-curable adhesive adhesive. According to one aspect of the invention, ultraviolet radiation (radiation with a wavelength of from about 10 nm to about 400 nm) with a radiation energy of from about 100 mg J / cm ² to about 800 mg J / cm ² , in other cases from about 400 mg J / cm, can be used. ² to about 730 mgJ / cm ² .

As shown in the following examples, it was found that UV curing is preferred since other forms of curing (such as electron beam curing) generally do not provide the desired adhesion and delamination in the above CCM range. According to one of the features of UV curing, a photoinitiator containing a mixture of benzophenone derivatives and a synergist compound can be used in the coating composition, as a result of which free radicals can form. In free-radical polymerization systems, the curing reaction stops when the UV radiation source ceases. One alternative to UV curing is cationically initiated polymerization. Cationic initiated polymerization systems that use photoinitiators such as onium salts or other UV-activated acid catalysts to crosslink epoxides or vinyl esters differ from free-radical-initiated systems in that the curing reaction continues even after the UV radiation source ceases .

As mentioned above, the resealable adhesive-based latch 12 generally has a peeling resistance or a bonding force that allows the opposing layers 30 and 32 to adhere to each other to seal or reseal the package 10. For example, to seal or close the package, the consumer may to press (as shown by arrows 33 in FIG. 4) two opposite layers to each other, which are shown pressed against each other in FIG. 5B. According to one approach, the adhesion between the adhesive layers 30 and 32 is generally sufficient to connect the layers 30 and 32 to each other, and in some cases hermetically sealed. It is understood that in the context of the present invention, the term hermetic seal means a generally airtight seal. In one example, the selected self-adhesive material (SCM), forming layers 30 and 32, may have an initial strength or adhesive strength when peeling from about 200 g / inch to about 900 g / inch (or gram per linear inch, g / ld), and in some cases, from about 200 g / inch to about 400 g / inch as measured by Method F according to ASTM D3330 / D3330M-04; however, the resealable retainer 12 may have other peel resistance values depending on the particular application or the specific measurement method. According to one aspect of the invention, a preferred peeling resistance is from about 280 g / ld to about 800 g / ld. Higher peeling resistance (i.e., more than about 900 g / ld) is generally excessive for some packages used as uncoupled and resealable packages, since the substrate may be damaged if cohesion bonds break at such large peel resistance values.

The selected SCM can also have a traction force during subsequent peeling (maintaining adhesion), preferably after five open / close operations of at least about 200 g / ld, or in other cases at least about 30% to about 200% of the adhesion during the first peeling, and at least about 50 g / in to about 200 g / in, with subsequent peeling offs being a capping-resealing that takes place after the package 10 is first opened and the resealable retainer is separated 12.

The adhesive-based latch 12 also preferably has a relatively low tack, which minimizes and preferably limits the adhesion of the latch 12 to unwanted materials (i.e., contamination) and surfaces such as food particles, molding equipment surfaces, rollers, etc. P. In one approach, the adhesive material may have a tack index to undesirable surfaces not exceeding about 5 psi. about 4.5 pounds preload per ASTM D2979 tack test method. According to another approach, the SCM coating may have a tack index not exceeding about 15 psi. an inch at a preload of about 10 pounds. However, the stickiness index may also vary depending on the specific SCM and its application, as well as the measurement method used. According to another scorecard, the stickiness of the adhesive-based retainer 12 is measured using a modified ASTM D3121 test version with a rolling ball, the adhesive material having a stickiness at which the ball travels from about 1 inch to about 8 inches. In some cases, the distance the ball travels is up to about 14 inches. Modified test D3121 is further explained below, as well as in the examples.

Even with such relatively low stickiness with respect to unwanted surfaces, the adhesive layers 30 and 32 still have a sufficiently high primary adhesion to the substrate 14 forming the front and rear elements 16 and 18, as a result of which the adhesive layers 30 and 32 are not predominantly peeled off when opening the package 10. According to one approach, the primary adhesion force of the adhesive layers 30 and 32 with the substrate 14 of the package at their border 38 generally exceeds its own peeling resistance of the bonded material. For example, the selected bonded material has a primary peeling resistance from the film substrate forming the front and rear elements 16 and 18, exceeding the peeling resistance of the layers 30 and 32, and in general is more than about 600, in other cases about 900 g / inch. In some other cases, it is more than about 1000 g / inch, and in some cases, more than about 1200 g / inch. In other cases, the primary peeling resistance may be from about 600 to about 1200 g / inch (in some cases, from about 600 to about 900 g / ld). However, the peeling resistance may also vary depending on the substrate 14, SCM and other factors.

In addition, it is further provided that the inter-surface, mechanical or chemical adhesion of the adhesive materials 30 and 32 to the substrate 14 can be enhanced by the specific structures of the materials of the substrate 14 in order to increase the surface adhesion energy, as generally described above. As indicated above, the substrate 14 may be a single-layer or multilayer film, and in this case, it is preferable that at least the inner layer of the film substrate 14, forming the front and rear elements 16 and 18, consist of a mixture of polymers containing a copolymer of ethylene and vinyl acetate (EVA ) and linear low density polyethylene (LLDPE). If you also use the additive or particles of enhancing the adhesion of the filler, they are preferably dispersed in at least this inner layer (ie the inner layer of a mixture of EVA / LLDPE). Preferably, EVA is the predominant component of the mixture and is contained in an amount of from about 65% to about 90%, and LLDPE is a minor component and is contained in an amount of from about 5% to about 25%. Preferably, the substrate, the inner layer and / or the layer of the EVA / LLDPE mixture have low concentrations of slip improvers (usually added to the substrate to obtain the coefficient of friction applicable for treating the substrate on molding and capping machines). It should be noted that such additives may contain certain amounts of fatty acid amides, and it was found that such compounds are capable of affecting the bonding strength of the bonded materials with the substrate. In this regard, according to one approach, the substrate 14 may contain less than about 1000 ppm of fatty acid amides (i.e., slip additives) dispersed in the inner layer or, in some cases, in the entire substrate 14.

Without being bound by any limiting theory, as mentioned above, it is assumed that fatty acid amides, which are low molecular weight components, are able to migrate to the surface of the substrate, affecting the adhesion between the surface of the substrate and the bonded materials. Although any fatty acid amide can initially be burned by corona treatment or fire treatment on the surface of the substrate and thereby provide an initial high adhesion force of SCM, over time additional fatty acid amides can migrate to the surface of the substrate, resulting in a reduction in the adhesive force over a long period of time storage. Thus, it is desirable to reduce the content of fatty acid amides in the substrate (in the inner layers or in the entire substrate) to a level of about 1000 ppm, which provides both a high initial adhesion force and a high long-term adhesion force, since over time on the surface of the substrate very small amounts of these impurities migrate. Alternatively, varieties of the composition of the substrate can also be used in combination with other surface treatment methods (corona treatment, plasma treatment, fire treatment, etc.) or other coatings, depending on the requirements of the particular application.

According to one approach, as flexible films forming the front and rear elements 16 and 18, a polyethylene-based film with a thickness of about 0.5 mils to about 5 mils, in some cases about 3 mils, can be used. On Fig illustrates one of the possible flexible films forming the front and rear elements 16 and 18, which is a multilayer coextruded film having a structural basis of one or more layers (two shown) of high density polyethylene 702 (HDPE), and the inner or an adhesive backing layer (such as the sealing layer described above), which is an EVA / LLDPE heat sealable layer 704 filled with filler reinforcing particles 706. According to this approach, an adhesive fastener 12 is applied to the inner thermally adhesive layer 704 of EVA / LLDPE, which forms the inner surface of the package 10.

As shown in FIG. 8, particle sizes 706 of an adherence enhancing filler, which may be an organoclay, are generally exaggerated for clarity, but are believed to be dispersed in an EVA / LLDPE inner or seal layer 704 and that at least some of the reinforcing particles adhesion of the filler (indicated by 708 in the drawings), for example, can at least partially extend or protrude from the outer surface 710 of the EVA / LLDPE layer 704, as is generally described in application 12/435768, the entire contents of which are in clause The order of reference is included in this application. Alternatively, the particles that enhance the adhesion of the filler may not extend to surface 708, but may form a rougher outer surface, thereby increasing the surface area for adhesion to the adhesive material. Without being bound by any limiting theory, the adhesion enhancing particles of filler 708 extending to the surface or protruding outward from the surface, in combination with corona treatment and / or the use of certain carriers for the filler, can facilitate adhesion of the latch to the substrate, whereby an effective primary adhesive force to the substrate is exceeded that exceeds the adhesive strength when peeling two adhesive layers 30 and 32. In general, when the adhesive strength when peeling two adhesive layers 30 and 32 is less than about 600 g / inch to about 900 g / inch; during repeated peeling / resealing cycles, the fixer and the substrate do not delaminate when using the described fillers and sealing structures. Thus, the primary adhesion force of the adhesive layers 30 and 32 to the substrate containing particles 706 enhancing the adhesion of the filler is more than about 600 g / ld, in some cases more than about 900 g / ld, as described above.

In other cases, and without being bound by any limiting theory, an increase in the primary adhesion force between the adhesive material and the substrate can occur due to diffusion of the liquid or uncured adhesive material into the gaps, voids, or other gaps between the particles of reinforcing adhesion of the filler (such as the gaps between the plates organoclay) and, in particular, in these gaps, voids or other gaps between the filler particles, they at least partially extend to the surface of the substrate. As a result of subsequent polymerization, the diffused liquid adhesive material is transformed into a solid adhesive material that can be bonded, bonded or otherwise bonded to the particles that enhance the adhesion of the filler to increase the primary adhesion to the substrate. In other cases and also without any connection with any theory, an increase in the primary adhesion force can also occur due to the affinity of the polar adhesive regions to the polar particles of the filler. In general, the filler particles have a greater polarity than the substrate and, therefore, provide a stronger adhesion to it.

Through the use of a adhesive-based fastener and the described substrates, a resealable adhesive-based fastener capable of repeatedly opening and closing without peeling from opposing portions 16 and 18 can be obtained, which is stable over time and provides generally repeatable results even after contamination by outsiders materials such as food crumbs. Even if the fixative based on adhesive material is contaminated by food crumbs or edible oil, the adhesive-based fixators proposed in the invention do not cause a loss of cohesive properties which makes them unusable.

According to one approach, the adhesive fasteners proposed in the invention retain adhesion or autohesion when peeling in case of contamination with the product, food crumbs, oils, etc. from about 50 g / in to about 900 g / in and have a residual adherence or adhesion force after contamination of at least about 20%, in some cases from about 30% to about 150% adhesion strength when peeling off to contamination. In the context of the present invention, the residual adhesion or adhesion force is a percentage indicator of peeling resistance after direct contact of the surface of the adhesive material with food particles relative to the peeling resistance of a clean or uncontaminated fixative.

A resealable fastener can be obtained that can be delaminated and re-sealed at least 5 to 10 and preferably more than once, but still retains low tack and re-closing properties. In addition, after mutual contact of the surfaces of the resealable retainer, it is able to again demonstrate all or some of its values for resistance to initial peeling. Depending on the final composition of the adhesive coating used, the resealable retainer is able to restore its peeling resistance even with a two to three minute interval between uncorking-resealing cycles. However, in some cases, shorter or longer time intervals between uncapping-resealing cycles may be required to restore peeling resistance. In some cases, the peeling resistance of the resealable retainer may actually increase with prolonged contact between opposing adhesive layers.

As shown in FIGS. 4-5B, in order to close the package 10, the user compresses the front and rear elements 16 and 18 in the direction of the arrows 33 with the fingers (or the machine in the capping stage during the packaging filling operations), as shown in FIG. 4, in order to adhere the opposite adhesive layers 30 and 32 and create a cohesive bond between them and thereby seal the package 10. To open the package 10, the user or the machine delaminates the sections 56 of the package (Fig. 5B) located above the latch 12 in the opposite directions 57, to separate to the adhesive layer 30 from the adhesive layer 32. According to one approach, the layers 30 and 32 are designed to repeatedly cork and re-uncork, and in some cases, the layers 30 and 32 preferably have sufficient structural integrity and integrity of the connection for corking and uncorking from about 5 to about 10 and more times. At the same time, specific layers and packages can be designed for uncorking and corking any number of times, depending on the specific configuration, weight of the coating and other parameters of the bonded layers and the substrate of the package.

A package 10 containing a resealable latch 12 can be used to store a wide variety of food and non-food products. Foods that can be stored include snack foods such as mixtures of dried fruits and nuts, nuts, seeds, dried fruits, cereals, cookies, crackers, chocolate, sweets, and the like. Packaging 10 can also be used to store drinks, cheese, cereals, ground coffee, desserts, pet food, and the like. Other possible uses of packaging 10 may include packaging various products for which re-capping and multiple opening are beneficial. These may include non-food products such as potting soil, sandwich bags, first aid kits, nuts and screws, stationery, cleaning products, laundry detergents, disposable tableware and utensils, CDs and (or) DVDs -discs, toys, modeling kits, kits for arts and crafts, electrical kits, etc. Of course, many other examples are possible.

The described adhesive fastener can also be used in addition to packaging, for example, in the case of consumer products that require a reusable fastener. For example, an adhesive clip can be used as a clip for disposable diapers, a clip for sports shoes, a clip for fasteners on outerwear, a clip for pockets or items of clothing, a clip for stationery or school items such as folders and folders, a clip for camping tents or backpacks, as reusable labels or tags on stands and cards for textbooks / school teaching materials, a latch for arts and crafts, such as albums newspaper clippings, a resettable latch for board game sets, or a resettable easy-to-use and remove fastener for tying goods during transportation.

Consider FIGS. 6 and 7, which illustrate an example of a corresponding process 500 that can be used to coat a substrate with a re-sealable latch 12 located on it. The application of layers 30 and 32 to the substrate 14 can be carried out by coating, printing, rotary deep printing or flexographic printing. Note that, depending on the requirements of a particular application, other coating methods may also be used. According to this approach, the substrate with the closure located on it may be a film in the form of a roll, which is then fed to molding-filling-sealing machines to form a package.

In this example of the process 500, a substrate 14 may be used in the form of a carrier film roll 502, which may be a single layer or multilayer film containing EVA / LLDPE as the inner layer 504 on which adhesive materials will be applied. The film is then unwound and sent to a first coating portion 506, on which an adhesive fixing layer can be applied to it. For example, a liquid adhesive mixture may be applied to a first engraved roller or drum 510, which delivers liquid SCM to a second or printing rubber roller or drum 512 onto which an image or impression 514 is applied, corresponding to the configuration, size and shape of the adhesive strip applied to the film. The second drum 512 feeds SCM onto a moving film substrate, whereby a first strip of SCM-containing material 516 is formed on the web. Liquid SCM can have properties such as viscosity from about 10,000 cP to about 50,000 cP at room temperature (20-25 ° C) and less than about 2,000 cP at a temperature of about 70-75 ° C. Coating with liquid SCM is preferably applied at a temperature of about 160 ° F (71 ° C), but also from about 86 ° F (30 ° C) to about 190 ° F (88 ° C).

After passing through the oven drying section 520 (which can be used for moderate heating to facilitate spreading and leveling of the coating), the web 14 can be directed to the UV curing portion 521 to cure the applied fixing layer. At 521, ultraviolet radiation can be used with a wavelength of from about 10 nm to about 400 nm and an energy dose unit of from about 100 mg J / cm ² to about 800 mg J / cm ² , and in some cases from about 400 mg J / cm ² to about 730 mg J / cm ² . After curing, the liquid coating layer forms a solid adhesive fixative 12 on the packaging substrate 14. Then, if applicable to the specific shape of the substrate 14, the substrate 14 may be wound on an intermediate roll 522 for storage or transfer to the next packaging forming section, such as the molding, filling and sealing process 600, generally illustrated in FIG. 7.

Consider FIG. 7, which illustrates one example of a molding-filling-capping machine 600 that utilizes an intermediate roll 522 obtained as a result of one form of process 500 (which can be split or cut into strips of an appropriate size prior to process 600) to form one example of a sealed package 602. In this example, a vertical packaging or in-line wrapping process is used, during which a substrate 14 is wrapped around a pressure tube 604 recharge. Using the first heat sealing unit 606, a first longitudinal weld 607 can be formed. Then, the second and third transverse welds 609 and 611 can be formed using a second transverse heat sealing unit 608 with an integrated decorating tool. As shown in FIG. 7, the seam 609 is made below the adhesive resealable retainer 613, created as described above, but the seam 609 can also be made above or above and below the adhesive resealable retainer 613. Finally, using the integrated into the unit 608 I transverse heat seal finishing tool substrate 14 can be cut between re-sealing adhesive 613 and lower clamp 611 adjacent suture package to thereby separate the package that has already been filled and sealed, from the next package, which is in the process of filling. It should be noted that the processes illustrated in FIGS. 6 and 7 are only examples of applicable methods for forming and (or) filling packages having a resealable latch 12 based on UV-cured adhesive material. Other methods may also be used, depending on the requirements of the particular application.

Coating mixtures used to form a resealable fixative 12 based on UV-cured adhesive material may optionally contain one or more additives or inert dyes to change the appearance of the fixative 12. For example, according to one approach, the fixative 12 may contain titanium dioxide. Such optional additives can facilitate the recognition of adhesive tapes in opposite areas due to the lower permeability of the adhesive material and thereby facilitate easier re-capping of the latch, as it will be easier for the consumer to detect opposite latch strips.

According to some aspects of the invention, a package can be created by method 800 and / or method 900, which are generally illustrated in FIGS. 9 and 10. According to one approach, as generally shown in FIG. 9, in step 802, on a package substrate, according to a corresponding a low-tack adhesive material having the configuration described above is applied to the stencil in order to place a latch 20 based on the adhesive material on it. Then, at 804, a low-tack adhesive material is cured on the packaging substrate, for example by UV curing. After the adhesive-based fastener 20 has been applied and cured, at step 806, a package 10 with a specific structure can be formed from the substrate, which can have any applicable shape, including the shapes shown in FIGS. 1-3. After forming the package 10, it can be filled, for example, with food products, etc. Alternatively, in some cases, packaging may first be formed, and then adhesive material may be applied to it.

FIG. 10 shows a method based on a different approach 900 for manufacturing a substrate useful for forming a stiffer package, such as shown in FIGS. 3A-3C. First, at step 902, graphics, coatings, layers, and / or alphanumeric characters are applied to various internal or external surfaces of the mat, which may be cardboard or the like, by printing or otherwise. At this stage 902, a topcoat, a polymer coating and the like can also be applied to the substrate, as described above. The topcoat layer or coating may contain the filler described above, if necessary to enhance adhesion of the adhesive material to the package. This can be done by any applicable method, including, for example, the spline coating method, flexographic printing, or intaglio printing. Then, the printed and / or deposited coating is dried in step 906, as a result of which, on a substrate, by an applicable method such as a spline coating method, flexographic printing, and intaglio printing, and the like. a low sticky adhesive material such as described above may be applied. Thereafter, the low-adhesive adhesive material is cured in step 908. After curing, the substrate is cut in step 910 into one or more blanks or other packaging structures using any suitable means, such as one or more punch dies, rotational dies, lasers, etc. ., and save until future use. When preforms are required to be used, at 912 they are fed to the packaging line. Alternatively, blanks may be formed on the packaging line itself. At step 914, a package of the desired shape 914 is formed on the packaging line by bending the preform along various bending lines, applying durable adhesive material to overlapping portions, and connecting them to each other. After the package has been created, it can be filled in stage 916 with one or more products, such as food products, and closed for further storage, transportation and display. Then, at step 918, the filled packages are wrapped with a transparent tight-fitting film, and at step 920, together with other wrapped packages, they are placed in a sealed outer general bag or package. At 922, a plurality of outdoor common bags or packages are placed in one or more boxes and shipped to a consumer, a retail store, a seller, and the like. Alternatively, a low tack adhesive material may be applied at later stages of the process, for example, after the step 910 is punching, after the forming step 914 and / or after the filling step 918, depending on the requirements of the particular application.

According to another approach, the described low-sticky re-curable adhesive materials can advantageously have the same tack (or at least perceived tack) and / or surface energy as a substrate without the use of low tack adhesive. For example, a resealable adhesive material with a low stickiness when it is touched by a consumer can have predominantly the same tack index or at least an indicator of perceived tack as an uncoated substrate or a neighboring film. In one approach, a rolling ball tack test can be used to demonstrate this, resulting in predominantly the same performance for a low tack adhesive material and an uncoated film. For example, in a rolling ball stickiness test (described above in the examples) of a sticky material with a low stickiness, the ball's path may be about 14 inches. When tested for stickiness with a rolling ball of film, without coating (i.e., without adhesive), the path of the ball may be 16-17 inches (average). In some cases, the values obtained from the stickiness test with a rolling ball of adhesive material with low stickiness can be only about 12-17% lower than the performance of the film without coating. According to other approaches, to demonstrate the similarity of the surfaces of the adhesive material and the uncoated film, the surface energy of the adhesive material with low tack can be used, which can be predominantly the same as that of the uncoated film. According to one approach, for example, the surface energy of an adhesive material with a low stickiness m film without coating can in both cases be from about 36 to about 38 dyne / cm ² , and in other cases about 36 dyne / cm ² .

The advantages and embodiments of the latch and packaging described in the invention will be further illustrated by the following examples; however, the specific conditions, processing patterns, materials and their quantities given in these examples, as well as other conditions and details, should not be interpreted in order to unreasonably limit the latch, packaging, and methods. All percentages are by weight unless otherwise indicated.

Examples

Example 1

Compatibility and storage stability were tested (the mixture is stable, which does not form a gel and does not have visible signs of separation after storage for up to 3 days at room temperature) of various mixtures of acrylic oligomers that regulate the stickiness of substances and elastomeric materials. The following Table 1 shows the tested combinations and formulations used.

Table 1 Resistance tested adhesives % component in the final adhesive composition Acrylic oligomer Elastomer Tackifier Elastomer Tackifier Tackifier Adhesive ratio (CCM) Stability of the liquid mixture during storage Sample Number AT FROM D E F - Observation after 3 days 1 (according to the invention) 40 fifteen 45 - - - 0.67 Stable, without noticeable gelation, without phase separation 2 (Comparative) - fifteen 45 - 40 - 0 Stable, but not cured due to too low CCM 3 (Comparative) 40 - 45 fifteen - - 0.67 Unstable due to phase separation; components were incompatible 4 (Comparative) - - 45 fifteen 40 - 0 Unstable due to phase separation and too low CCM 5 40 fifteen 25 - - twenty 0.67 Steady without

% component in the final adhesive composition Acrylic oligomer Elastomer Tackifier Elastomer Tackifier Tackifier Adhesive ratio (CCM) Stability of the liquid mixture during storage Sample Number BUT AT FROM D E F - Observation after 3 days (according to the invention) noticeable gelation, no phase separation 6 (Comparative) 40 fifteen - - - 45 0.67 Unstable due to phase separation; components were incompatible 7 (Comparative) 60 - - - - 40 1,5 Unstable due to phase separation 8 (Comparative) - - - - 60 40 0 Unstable due to gel formation and too low CCM

The following components were used:

A = acrylic epoxidized soybean oil (CN 111 US, Sartomer Company, Exton, PA, USA).

B = methacrylic polybutadiene (RicCKKy1 ^® 3500, Sartomer Company).

C = Aliphatic Acrylic Oligomer with High Tack (CN 3001, Sartomer Company). This component is a mixture of aliphatic urethane acrylate and tack-enhancing hydrocarbon polymers.

D = copolymer of styrene and butadiene (Ricon 184, Sartomer Company).

E = high stick aliphatic urethane acrylic oligomer (CN 3211, Sartomer Company).

F = stickiness enhancing concentrate, derived from a light aromatic polymer with a faint odor (PRO 11236, Sartomer Company).

Adhesive ratio = (% by weight of acrylic oligomer) materials (CCM) (% by weight of elastomer +% by weight of tackifier)

The stability or compatibility of these adhesive components may depend on the method of manufacture, transportation, in-plant storage, and application of the coating fluid mixture. Stability was evaluated visually based on the appearance and uniformity of the observed composition after storage for three days (about 72 hours). It was noted that Samples 1, 2, and 5 from Table 1 were visually satisfactory mixtures of various adhesive components that remained homogeneous after 3 days, i.e. there was no visible separation of the components or gelation. Although Sample 2 had a stable composition, this adhesive component had an undesirable CCM and did not have proper cure (this can be seen from the results of the abrasion cure test using MEKs given in Table 3 below for Sample 10 with a similar composition). At the same time, Samples 1 and 5 were stable adhesive mixtures with proper curing, as well as the necessary CCM in the range from 0.5 to 1.5. The remaining samples of the mixtures were phase separated, they became too viscous and (or) gel-like (Sample 8 became gel-like after 3 days). Sample 8 formed a gel, which is a sign of incompatibility of the composition formed by the aliphatic acrylate or component E in combination with the stickiness enhancer F.

Thus, in order to obtain a stable adhesive material suitable for use according to the present invention, the stable adhesive material as a whole must meet one of the following, in some cases several of the following, and in other cases all of the following conditions: contain compatible components, have the desired ratio curable adhesive components and contain all three components (i.e., acrylic oligomer, elastomer and tackifier).

Example 2

Based on the initial compatibility results of adhesive materials for the stable formulations of Example 1, these formulations were further refined, resulting in five adhesive coatings, which in all cases remained stable for at least 24 hours as a mixture of the components shown in Table 2 .

table 2 Refined Adhesives % component in the final adhesive composition Acrylic oligomer Elastomer Tackifier Elastomer Tackifier Tackifier Adhesive ratio (CCM) Stability after 24 hours Sample Number BUT AT FROM D E F - - 9 40 fifteen 45 - - - 0.67 Yes 10 - fifteen 45 - 40 - 0 Yes eleven 40 fifteen twenty - - 25 0.67 Yes 12 fifty - 45 5 - - one Yes 13 45 - 45 10 - - 0.82 Yes

Components A-F are the components from Example 1 above. Samples 9 and 10 correspond to Samples 1 and 2, respectively, of Example 1. Sample 11 is a variation of Sample 5 from Example 1. The remaining samples had new compositions.

After all five formulations showed good adhesive compatibility for at least one day, all the five samples was added about 1% photoinitiator (Esacure ^® KTO 46, Lamberti Spa, Italy), and then subjected to a further test. The photoinitiator consisted of a liquid mixture of trimethylbenzoyl diphenylphosphine oxide, α-hydroxyketones and benzophenone derivatives. Samples were then applied to film substrates containing a copolymer of ethylene and vinyl acetate (EVA), linear low-density linear organometallic polyethylene (LLDPE) and about 12% of an organoclay-based composition (containing about 57-63% organomodified clay and a carrier based on maleic grafted linear polyethylene low density, PolyOne Corporation, McHenry, Illinois, USA). In particular, the substrate contained about 77% by weight (EVA), about 10% by weight of organometallic LLDPE, and about 13% by weight of an organoclay composition. After applying the samples to the film substrate, they were cured using ultraviolet radiation in three passes under a D-lamp, which is a lamp with halide compounds of mercury and iron. One pass under the D-lamp corresponded to irradiation with energy from about 75 mgJ / cm ² to 100 mgJ / cm ² . After curing, the degree of curing of the adhesive layer and the adhesion to the film were evaluated.

The degree of cure of the adhesive material was evaluated using a solvent abrasion test method known as methyl ethyl ketone abrasion test method (MEK) according to ASTM D5204. A good cure rate for the MEK abrasion test is 100 or more double abrasions, which indicates that the adhesive has been properly cured and therefore has resistance to abrasion using MEK. Poorly cured adhesive materials did not have high abrasion resistance using MEK (for example, 10 or less double abrasions). The results of the abrasion test using MEK are shown below in Table 3.

The stickiness and initial peeling resistance of adhesive materials, which were evaluated subjectively, were also investigated. The stickiness of the adhesive layer was examined by touching it, and the stickiness level was evaluated on a rating scale including a low (L), medium (M), and high (H) level. Similarly, also on the L, M, and H scales, the subjective effort required to manually delaminate the samples was evaluated. The test results are shown in Table 3.

Table 3 The results of the test for curing and initial adhesion of the compositions of Table 2 Sample Number MEK abrasion test (number of double abrasions) Subjective Tack Test Subjective peeling test 9 (according to the invention) > 100 M M 10 (Comparative) -10 MH MH P (according to the invention) > 100 M M 12 (Comparative) 100 (surface clouding) M M 13 (Comparative) 100 (surface clouding) MH MH

All samples had at least moderate tack and peeling resistance. Sample 10 had the highest subjective stickiness and peeling resistance, but the worst cure, confirmed by an MEK abrasion test value of about 10, which means that after about 10 abrasions using MEK, the adhesive material has separated from the substrate. Samples 12 and 13 became cloudy after the MEK abrasion test, most likely due to component D (styrene-butadiene copolymer) coming to the surface during abrasion using MEK. Thus, although Samples 12 and 13 have a ratio of adhesive components in the required range, component D is probably incompatible with the other two components and, therefore, is not a satisfactory adhesive compound. It was desirable to obtain an adhesive material with an average or lower level of subjective stickiness, an average or higher level of subjective peeling resistance and an MEK abrasion test index of 100 or more double abrasions without clouding, which at least Samples 9 and 11 demonstrate.

Example 3

The effectiveness of curing three different types of adhesive composition was tested by applying the adhesive material to the same film substrate, as described in Example 2, and then curing in three different ways, including curing by UV radiation ("UV curing") on industrial equipment, electron beam curing (EL) ("EL curing") on industrial equipment similar to UV curing equipment, but using electron beam curing technology, and EL curing in laboratory equipment ("laboratory EL-curing"). Table 4 shows the composition of the three tested adhesive materials. A comparison of the industrial EL system and the laboratory EL system was carried out due to differences in the radiation energy provided by them. CN 111 US was used as an acrylic oligomer, RicCKKyI ^® 3500 was used as an elastomer, and CN 3001 was used as a tackifier, as described in Example 1.

Table 4 Adhesive Samples % component in the final adhesive composition Sample Number Acrylic oligomer Elastomer Tackifier Adhesive ratio (CCM) 14 (Comparative) 69.2 7.7 23.1 2.2 15 (according to the invention) 45 fifteen 40 0.81 16 (according to the invention) 35 fifteen fifty 0.53

"UV curing" consisted in the fact that the coated samples were passed under an ultraviolet lamp at a speed of about 25 ft / min in air and carried out from about 2 to 4 passes, as a result of which the sample passed 2 to 4 times under ultraviolet lamps. One pass under an ultraviolet lamp at a speed of 25 ft / min corresponded to irradiation with an energy of about 100 mg J / cm. "EL curing" in an industrial system (Faustel Corporation, Germantown, Wisconsin, USA) was carried out in a nitrogen gas atmosphere with a speed of about 125 ft / min to about 250 ft / min in one run, with a radiation dose of about 2 mrad to about 2.4 mrad, and "laboratory EL curing" was also carried out in nitrogen, but this required about 6 to 8 passes at a speed of about 10 ft / min and the irradiation for 6-8 passes through the laboratory EL device was from about 2 mrad to about 4 mrad. It should be noted that in some cases, to ensure high resistance to peeling of one adhesive material from another adhesive material, a low surface quality of the adhesive fixer is desirable. materials 12 have nasal surfaces with an orange peel structure; adhesive fasteners 12 usually adhere well to each other. It was found that all specimens with a cured coating had smooth surfaces with relatively low quality. After all samples were cured, they were tested for peeling resistance by Method F according to ASTM D3330 / D3330M-04, the results of which are shown in Table 5 below.

Table 5 The results of testing the resistance to peeling with various methods of curing (UV in comparison with EL) Peel Resistance Test Results According to the invention Comparative Sample Number UV curing peeling resistance The number of passes through the UV system EL cure peeling resistance The number of passes through the EL system Laboratory PE curing peeling resistance The number of passes through the laboratory EL system 14 (Comparative) 200 g / ld 2 0 g / ld one 100 g / ld 6-8 passes 15 (according to the invention) 480 g / l 3,5 0 g / ld one 200 g / ld 6-8 passes 16 (according to the invention) 680 g / ld four 0 g / ld one 200 g / ld 6-8 passes

It was unexpectedly found that the results of UV curing reversal (UV curing) are superior to the results of both EL curing in both systems. During EL curing on the industrial line, adhesion was completely absent, i.e. peeling resistance was 0 g / ld. In laboratory EL curing, some adhesion was observed, but UV cured samples showed the best adhesion of all samples.

In terms of UV curing results, Samples 15 and 16 had acceptable peel strengths (i.e., 480 g / ld and 680 g / ld, respectively), while Sample 14 had lower peel strength (i.e. 200 g / ld). The lower peeling resistance of Sample 14 is probably due to the use of an adhesive composition in it, the ratio of components of which is not in the required range from 0.5 to 1.5 (i.e., the ratio was 2.2).

Without regard to any limiting theory, it is assumed that UV curing under ambient conditions (with an oxygen content of about 21%) provides curing of the sample from the bottom up to its surface due to oxygen-enhanced inhibition of free radical curing in adhesive areas in the vicinity or near surface. Since sticky components are more aliphatic in nature, they have lower surface energy than, for example, ester or urethane components. In some cases, self-organizing chemical systems move to a lower energy level if they have sufficient time for this. In this case, it is assumed that a lower UV curing rate provides sufficient time for the migration of the sticky coating components towards the surface. In contrast, during EL curing, the curing reaction proceeds at a much higher rate, resulting in a more random distribution of the polymer, which cross-links too quickly in the growing network polymer structure so that significant self-ordering due to surface energy occurs. Thus, the nature of the EL curing process can be the opposite of the nature of the UV curing process, while EL curing usually proceeds in a nitrogen-purified medium and can lead to faster curing on the surface and slower near the substrate. Because of this, an adhesive material with completely different characteristics can be obtained solely due to different curing methods. Typically, such a quick cure is desirable, but in the case of the coatings described in the invention, such a quick cure is disadvantageous because it does not provide sufficient time for the adhesive components to self-organize completely.

Without regard to any limiting theory, it is further assumed that slower UV curing allows the growing polymer blocks to self-order, resulting in polarized polymer blocks having an affinity for the substrate, and non-polarized polymer blocks having an affinity for the surface, due to the presence of unpolarized polymer blocks near the surface of the substrate, the adhesive coating adheres and adheres to itself. Due to this, adhesive components accumulate at the adhesive / substrate interface, which are most compatible with the film substrate, and thereby adhere to the substrate, which may be one of the factors contributing to the absence of peeling from the film substrate.

Example 4

Two Samples 17 and 18, proposed in the invention of resealing adhesive-based fasteners according to Table 6, were made. Both adhesive samples were compared with a standard self-adhesive fixing latch (control SCM, Sample 19) for a commercially available Nabisco Chips Ahoy Snack'n package Seal ^® packaging made from standard SCM (Fasson 5700, Avery Dennison Corp., Pasadena, California, USA).

Table 6 Adhesive-based retainer compositions % component in the final adhesive composition Samples CN 111 US (Acrylic Oligomer) RicCKKyI ^® 3500 (Elastomer) CN3211 (Tackifier) Esacure ^® KT046 (Photo Initiator) Adhesive ratio (CCM) 17 (according to the invention) 35 12 fifty 3 0.56 18 (according to the invention) 35 0 62 3 0.56

The coated substrate contained about 77.2% EVA, about 10% organometallic LLDPE, and about 12.8% of a concentrated filler composition based on PolyOne 231-615 organoclay. The concentrate contained from about 57% to about 63% of organically modified clay and a carrier containing MA-LLDPE and polyethylene. Sample 17 was cured at the UV curing spot using an average light energy of about 730 mg J / cm ² and with an average linear speed of about 100 ft / min at an average temperature in the oven of 130 ° F. Sample 18 was cured at the UV curing spot using an average light energy of about 700 mg J / cm ² with a linear velocity of about 100 ft / min at a temperature in the oven of 160 ° F. The standard adhesive material (control SCM) was used ready-made and glued to the packaging for cookies (Kraft Foods).

All three packages were tested for contamination with crumbs to determine if food particles had a negative effect on the corking of the corresponding adhesive material. The test for contamination with crumbs consisted of the following stages: first they took the Triscuit ^® cracker and crushed it with the bottom of a glass vessel. As a result of coloring in this way, fine cracker particles are formed that correspond to particles that remain at the bottom of the package. Then, an annular clip with a diameter of 2 inches was installed on the test sample of adhesive material. About 5 grams of crumbs were poured onto the ring mounted on the sample. The sample and the ring were shaken slightly so that the crumbs fell on the adhesive surface of the resealable retainer. The ring was removed from the sample, and the crumbs were slightly shaken off the sample and removed. The ring was again placed on the substrate in its original position, and the number of remaining crumbs in the area in which they fell was visually evaluated. A scale of visual ratings from zero to 100 was used, according to which a rating of zero meant no visible remaining crumbs, and a rating of 100 meant that the entire surface was covered with adhering crumbs. The results of the test for pollution by crumbs of crackers are shown in Table 7.

In addition, the resistance of the adhesive material to peeling after contamination with cracker crumbs was tested. Peeling resistance was measured by the standard method F in accordance with ASTM D3330 / D3330M-04, according to which the adhesive strength of the adhesive material was determined by peeling one side from the other and measuring the force required for this. The initial peeling resistance, the subsequent peeling resistance after the first contamination with cracker crumbs and the second peeling resistance after the second contamination with cracker crumbs were measured, when the sample was contaminated by the same method as in the initial contamination. The results are presented in Table 7.

Table 7 Crumb Pollution Test Results Samples Initial peeling resistance (no contamination) (g / ld) Peeling resistance after the first contamination (g / ld) % peeling resistance, preserved after the first contamination Peeling resistance after second contamination (g / ld) % peeling resistance, preserved after the second contamination Pollution assessment 17 315 167 53% 128 41% 0-10 eighteen 1) 6 161 138% 155 133% 0-10 19 (control SCM) 499 196 39% 25 5% 60-80

As can be seen from the results, the sticking ability (i.e., peeling resistance) of the control SCM, measured by the F test method according to ASTM D3330 / D3330M-04, decreased and amounted to about 5% of its initial peeling force (i.e., decreased from about 500 g / ld to about 25 g / ld) after only two contaminants with cracker crumbs. In contrast, both Samples 17 and 18 of the adhesive material retained at least about 41% of their initial peeling force after two contamination with cracker crumbs, while the peeling resistance of Sample 18 actually increased after contamination and repeated capping and opening. In addition, a visual assessment of contamination by the edges of the Samples ranged from 0 to 10 compared to 60-80 for the control SCM.

Uncontaminated Samples 17, 18, and 19 were also tested with a rolling ball according to a modified ASTM D3121 test variant in accordance with ASTM D3121 test parameters, unless otherwise indicated. Using a modified method, it was determined how firmly the coating surface adheres to dissimilar materials, such as the polar surface of a rolling glass ball.

The rolling ball test involved the steps of: releasing a glass ball placed two inches up the surface with a standard inclination according to ASTM, and allowing the ball to accelerate along the inclination and roll along the horizontal surface of the sample of self-adhesive material. According to a modified test variant, a glass ball having a diameter of about 1/8 inch was used instead of a metal ball, and a lower initial position on the slope was used (i.e., as indicated above, two inches up the slope). The relative stickiness was determined by measuring the path of the ball along the surface of the adhesive material to a stop, starting from the end of the slope. A longer ball path meant less stickiness to the polar surface of the glass ball and less tendency for the coating to adhere to the rollers and metal surfaces of the packaging machines, while a shorter ball path indicated a higher stickiness. A longer ball path may also correspond to less tendency to stick to food crumbs. In this case, the measurements were limited to a maximum size of 4 inches, taking into account the maximum size of a test sample of 4.0 inches × 4.0 inches. Rolling ball tack test results are shown in Table 8.

Table 8 Rolling Ball Test Results Samples Ball path (inches) 17 > 4 eighteen > 4 19 (control SCM) 1/8

As can be seen from the results, both samples 17 and 18 according to the invention had less surface tack than the control sample, as evidenced by the fact that the glass ball rolled freely over the surface of the resealable retainer and a 4-inch sample. In contrast, the glass ball adhered to the control SCM almost immediately after contacting the surface of the control SCM, which indicates a high surface stickiness of the coating.

Example 5

A re-peeling test was conducted to determine the ability to re-cork and peel after repeated repetitions. About 20 samples were made; Samples 20-35 were made using Sample 17 of the adhesive composition of Example 4, and Samples 36-38 were made using Sample 18 of the adhesive composition of Example 4. Samples were made on a pilot industrial production line for coating by flexographic printing. The adhesive system was preheated to 160 ° F (71 ° C) and passed through a chamber knife device that was mounted on an engraved ceramic roller coated with chromium oxide. Using an engraved roller (the temperature of which was also maintained at 160 ° F (71 ° C)), the liquid adhesive coating was transferred onto a rubber roller to apply a pattern. Using a rubber roller, the coated pattern was transferred onto a moving film (i.e., by the method illustrated in FIG. 6). After the coating section, the film was fed through a 60-foot oven-drying section. At the exit of the kiln drying section, there was a UV installation consisting of 3 groups of ultraviolet lamps. Due to the configuration with the UV treatment zone at the exit of the furnace drying section, the maximum path length was ensured from the coating area on which the material was applied to the UV curing area and the time available for spreading and leveling the liquid adhesive coating was maximized curing to form a crosslinked network polymer structure. It is contemplated that in some cases, a smooth and even coating surface contributes to the required peeling force of adhesive materials from one another in a fully cured adhesive material.

A number of coating experiments were carried out. Changed the linear speed, temperature in the drying oven and the number of groups of ultraviolet lamps. The experimental design and experimental observations in a generalized form are shown below in Table 9. The visual surface roughness, abrasion resistance using MEK, and the separation of adhesive material at the adhesion of adhesive samples were determined before testing. In general, samples made at linear speeds from 300 ft / min to 500 ft / min had a rough surface and low or no subjective peeling force. For these samples, it was for the most part impossible to carry out instrumental measurement of the peeling force, since the joined samples were separated by themselves before further tests could be carried out. Samples made at a linear speed of 100 ft / min had a smooth-looking surface and moderate force when peeling off adhesive materials. These samples were further evaluated by instrumental testing for peeling force, the results of which are summarized below in Tables 10 and 11. As shown in Table 9, tests for multiple peeling-resealing were carried out only on samples that were not separated independently. These samples are Samples 21, 22, 29, 30, 31, 32, 35, 36, and 38.

Table 9 Scheme of the experiment used in the manufacture of samples for testing for repeated peeling Sample Number Adhesive material sample number a Line speed (ft / min) Oven Temperature (° F) The number of groups of UV lamps The appearance of the adhesive surface MEK abrasion test (number of double abrasions) Separation of connected samples twenty 17 (Ex.4) 500 one hundred 3 Very rough fifteen Yes 21 17 (Ex.4) one hundred one hundred one Smooth 100+ No 22 17 (Ex.4) one hundred one hundred 3 Smooth 100+ No 23 17 (Ex.4) 500 one hundred one Very rough 5 Yes 24 17 (Ex.4) 300 one hundred 2 Very rough 100+ Yes 25 17 (Ex.4) 500 130 2 Very rough 60 Yes 26 17 (Ex.4) 300 130 2 Very rough one hundred Yes 27 17 (Ex.4) 300 130 3 Very rough one hundred Yes 28 17 (Ex.4) 300 130 one Very rough twenty Yes 29th 17 (Ex.4) one hundred 160 one Smooth 100+ No thirty 17 (Ex.4) 300 160 2 Slightly roughened 100+ No 31 17 (Ex.4) one hundred 160 2 Smooth 100+ No 32 17 (Ex.4) one hundred 160 3 Smooth 100+ No 33 17 (Ex.4) 500 160 one Very rough 5 Yes 34 17 (Ex, 4) 500 160 3 Very rough one hundred No 35 17 (Ex.4) one hundred 130 2 Smooth 100+ No

Sample Number Adhesive based sample number Line speed (ft / min) Oven Temperature (° F) The number of groups of UV lamps The appearance of the adhesive surface MEK abrasion test (number of double abrasions) Separation of connected samples 36 18 (Ex.4) one hundred 160 3 Smooth one hundred No 37 18 (Ex.4) 500 160 3 Grungy one hundred Yes 38 18 (Ex.4) 300 160 3 Grungy one hundred No

The first series of peeling tests was carried out with short intervals between peeling, i.e. with an interval of about three minutes between peeling-resealing operations. The results of these tests are shown in Table 10, which presents the average of two samples for each test condition. These results are given in comparison with the performance of Sample 19 (control SCM) from Example 4.

Table 10 Three-minute peeling-resealing test results Peeling resistance value (g / ld) Peeling number Sample 19 Control SCM Sample 21 Sample 22 Sample 29 Sample 30 Sample 31 Sample 32 Sample 35 Sample 36 Sample 38 one 459.8 291.8 461.8 273.3 148.0 266.7 417.4 418.3 273.9 136.9 2 320.8 74.0 242.1 131.6 32,5 129.7 206.3 195.8 527.2 43.0 3 275.0 52,4 204.4 111.5 27.1 112.9 180.8 171.9 452.9 44.8 four 254.7 51.8 183.2 107.6 24.2 104.1 158.6 141.6 424.7 41.1 5 256.9 48.7 161.8 99,2 23.7 102.3 140.5 128.8 404.6 41.8

The second series of peeling tests was carried out with longer intervals between peeling, i.e. with an interval of about 24 hours between peeling-resealing operations, in order to determine the effect of a longer contact of the adhesive material with the adhesive material, the first peeling being carried out one week after the manufacture of the samples. The results of these tests with an extended interval between peeling-resealing of the samples are shown in Table 11.

Table 11 24-hour peeling-re-capping test results Peeling resistance value (g / ld) Peeling number Sample 19 Control SCM Sample 21 Sample 22 Sample 29 Sample 30 Sample 31 Sample 32 Sample 35 Sample 36 Sample 38 one 539.8 271.1 441.7 288.8 149.2 301.9 434.7 432.5 277.3 124 2 521.6 202 362.1 238.5 116.2 147 327.6 338.7 447.4 107.3 3 514.6 233.1 349.6 248.3 115.8 226.3 297.6 321.6 478.5 106.5 four 550.3 218.2 314.8 222.2 95.5 239 286.5 289 493.9 116.8 5 567 231.9 285.9 236.9 95.9 224 299.9 280,4 487.5 125.1

As the results show, in samples containing the adhesive composition according to Sample 17 from Example 4, there is no such pronounced weakening of the peeling force, which usually occurs with repeated peeling with an interval of 24 hours (i.e., Samples 21, 22, 29, 30, 31, 32 and 35 of this example). When Sample 17 of the adhesive material was in contact with itself for 24 hours between peeling, the peeling force was restored to about 85% of its original size even after five cycles of uncorking-resealing. Sample 30 had significantly lower average peeling forces compared to the other Samples tested, although the joined samples did not separate on their own, they had a lower surface finish due to a higher linear speed of 300 ft / min.

In addition, it was surprisingly found that samples containing adhesive compositions according to Sample 18 from Example 4 actually increased the peeling force (i.e., Sample 36 in this example) with multiple peeling, both short and long the intervals between the peeling test cycles, which, like the results of their peeling tests in Table 7 shown in Table 7, indicate the complete restoration of the peeling force after repeated capping. The magnitude of the peeling force increased only for Sample 36. Sample 36 is a sample cured with a lower linear speed, which could help to ensure a smooth and smooth surface of the sample (see Table 9). Since Sample 38 was made at a higher linear speed than Sample 36, it has a rougher surface, which can cause an increased value of the peeling force, as well as a low value of the initial peeling force.

For comparison, the restoration of the peeling force in the control SCM was observed only with a large interval between peeling, i.e. 24 hours. With a shorter interval, the peeling force decreased by almost 40%.

In general, the best results of both peeling-resealing tests were obtained for Samples 22, 32, 35, and 36. All four of these samples contained adhesive materials obtained under similar process conditions. For example, all four samples were fabricated at a low linear speed of 100 ft / min using at least two or more groups of ultraviolet lamps. Adhesive materials that did not pass the peel-reseal test probably did not have sufficient time to spread and level before curing with UV radiation.

Example 6

The durability test of the adhesive material was carried out according to Samples 17 and 18 of Example 4, Table 6, in order to understand the effects of a longer contact time of the adhesive material with the adhesive material on the peeling properties. Within seven weeks, various properties of the adhesive material were tested, including the subjective force of the initial peeling (i.e. low, medium, high), the appearance after peeling, subjective stickiness or the tendency to stick to the fingers (i.e. no, low medium, high ), coating strength (i.e., MEK solvent abrasion test using ASTM D5204 method) and instrumentally measured peeling (i.e. 5 consecutive peeling, repeated on the same sample at intervals of about 3 minutes, method F according toASTM D3330 / D3330M-04; in this case, two samples were tested, and the results were averaged), in all cases with different duration of contact of the adhesive material with the adhesive material. Adhesive materials were applied to the same film substrates that were used in Example 2. Table 12 further shows the durability test results of Sample 17. Table 13 shows the test results of Sample 18 for durability.

Table 12 Generalized Test Results of Sample 17 for Durability Test performed Day 0 Day 3 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Subjective Initial Peeling Force N N N N N N N N N Change in appearance after peeling No change in the appearance of the adhesive No change in the appearance of the adhesive No change in the appearance of the adhesive No change in the appearance of the adhesive Spotted whitening surface Spotted whitening surface Spotted whitening surface Spotted whitening surface Spotted whitening surface Subjective Stickiness Low Low Low Low Absent Absent Absent Absent Absent MEK abrasion test (number of double abrasions) > 100 > 100 > 100 > 100 > 100 > 100 > 100 > 100 > 100 The average resistance to 1 peeling in g / inch 553 567 559 553 463 600 323 505 592 The average resistance to 2 peeling in g / inch 370 381 377 382 343 375 241 311 348 The average resistance to 3 peeling in g / inch 339 354 347 361 333 352 228 300 335 The average resistance to 4 peeling in g / inch 318 342 340 338 330 326 232 292 326 The average resistance to 5 peeling in g / inch 311 322 326 323 311 297 226 277 317 The average resistance of five exfoliation in g / inch 378 393 390 391 356 390 250 337 384

Table 13 The influence of the duration of contact of the adhesive material with the adhesive material on the properties of multiple peeling (Sample 18) Test performed Day 0 Day 3 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Subjective Initial Peeling Force H + N N N N N H + H + H + Change in appearance after peeling No change in the appearance of the adhesive No change in the appearance of the adhesive No change in the appearance of the adhesive No change in the appearance of the adhesive Surface damage Surface damage Surface damage Surface damage Surface damage Subjective stickiness Low Low Low Low Absent Absent Absent Absent Absent MEK abrasion test (number of double abrasions) > 100 > 100 > 100 > 100 > 100 > 100 > 100 > 100 > 100 The average resistance to 1 peeling in g / inch 781 819 788 800 944 833 819 846 963 The average resistance to 2 peeling in g / inch 519 586 567 590 668 377 576 622 556 The average resistance to 3 peeling in g / inch 438 485 510 519 428 234 437 485 218 The average resistance to 4 peeling in g / inch 399 396 407 409 102 107 322 229 105 The average resistance to 5 peeling in g / inch 386 358 343 361 64 66 251 134 73 The average resistance of five exfoliations in 505 529 523 536 441 323 481 463 383

Test performed Day 0 Day 3 Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 g / inch

It should be noted that the average value of peeling resistance is the average value obtained as a result of five peeling of the same sample, which were successively carried out at intervals of approximately three minutes. Thus, the first peeling was carried out, the resistance value to the first peeling was determined, and the sample of the resealable retainer was resealed. After three minutes, the resealable retainer was again uncorked and the peeling resistance was measured. This process was repeated until five exfoliations were carried out.

Both Samples 17 and 18 had good indicators of subjective peeling force, subjective stickiness and MEK abrasion test results regardless of the duration of contact of the adhesive material with the adhesive material. The peeling forces of Sample 17 (i.e., the initial and subsequent peeling using the same Sample) remained consistent regardless of the duration of contact of the adhesive material with the adhesive material in the range from zero days to the 7th week. The peeling-re-capping cycle of Sample 17 was significantly more consistent than that of Sample 18, The loss of adhesive force of the adhesive material with the adhesive material after the initial peeling of the Sample 17, in terms of the decrease in the peeling force after the subsequent peeling, was generally less than about 10% for each subsequent peeling and was constant regardless of the duration of contact of the adhesive material with the adhesive material.

Starting from the 3rd week, a visible change in both Samples 17 and 18 (i.e., a noticeable whitening and increase in impermeability) was observed after peeling of the aged samples. It is assumed that the visible change is evidence of microscopic surface deformation of the adhesive material due to the forces exerted on the surface of the adhesive material during peeling by hand or using tools. Surface deformation does not affect the essential functional properties of the adhesive material (i.e., stickiness or peeling resistance). Ultimately, Sample 17 was preserved somewhat better, while its peeling resistance increased with time, i.e. peeling resistance was restored, or a 10% loss of peeling between successive peeling was generally maintained.

Example 7

Sample 17 of the resealable adhesive-based fastener according to the invention of Example 4 was compared with three other Samples 39-41 of the adhesive-based resealable adhesive according to the invention, the compositions of which are shown in Table 14.

Table 14 Adhesive-based retainer compositions % component in the final adhesive composition Samples CN 111 US (Acrylic Oligomer) RicCKKyI ^® 3500 (Elastomer) CN 3211 (Tackifier) BR 144 (Acrylic Oligomer) CN 2302 (Acrylic Oligomer) Esacure ^® KT 046 (Photoinitiator) Adhesive ratio (CCM) 17 (according to the invention) 35 12 fifty 0 0 3 0.56 39 (according to the invention) 27 0 fifty twenty 0 3 0.94 40 (according to the invention) 35 3 39 twenty 0 3 1.31 41 (according to the invention) fifteen 0 45 twenty 17 3 1.16

A component of BR 144 is an acrylic oligomer (BR 144, Bomar Specialties Company, Torrington, Connecticut, USA). A component of CN 2302 is also an acrylic oligomer (CN 2302, Sartomer Company). All three Samples 39-41 included BR 144 acrylic oligomer, with Samples 39 and 40 containing two acrylic oligomers and Sample 41 containing three acrylic oligomers.

Adhesive materials were applied to the same film substrates that were used in Example 2. Samples 39-41 were cured at the UV curing site with an average linear speed of about 25 ft / min in three passes under ultraviolet lamps with a total energy of about 400 mg J / cm ² to about 600 mgJ / cm ² .

We tested four adhesive materials for the strength of the coating (i.e., the MEK solvent abrasion test according to ASTM D5204), as well as the initial peeling resistance test by Method F according to ASTM D3330 / D3330M-04. A rolling ball test was also carried out using a modified ASTM D3121 test variant as described in Example 4, except that the size of the patterns available for testing was about 2.5 inches wide and about 7 inches long. The results of these tests are shown in Table 15.

Table 15 Curing and Adhesion Test Results Using the Compositions of Table 14 Samples MEK abrasion test number of double abrasions) The initial peeling resistance is 1 (g / ld) The initial peeling resistance is 2 (g / ld) The average amount of adhesion during initial peeling (g / ld) Ball path (inch) 17 > 100 184 191 188 1,5 39 > 100 698 733 716 6.0 40 > 100 341 333 337 > 7.0 41 > 100 336 289 313 > 7.0

Resistance to initial peeling, i.e. initial peeling carried out under laboratory conditions increased in the new formulations by about 30% -300% compared to Sample 17 containing only one acrylic oligomer. The path of the ball increased for new compositions by more than 300% compared with Sample 17.

From the results obtained, it can be seen that the new compositions containing two or more acrylic oligomers had overall improved performance compared to Sample 17, which is confirmed by the results of tests with a rolling ball and peeling resistance. All samples had an excellent curing rate, as evidenced by the results of MEK abrasion tests. In particular, all samples of new compositions, i.e. Samples 39-41 had a lower surface tack than Sample 17, and in particular Samples 40 and 41 had an even lower surface tack, as evidenced by the fact that the glass ball rolled freely over the surface of the resealable retainer and 7-inch-long sample.

Example 8

Four re-curable adhesive-based fasteners according to the invention of Example 7 were tested for various re-peeling. Samples were initially peeled and opened, the peeling force in grams per linear inch (g / ld) was measured by Method F according to ASTM D3330 / D3330M-04, then resealed for three minutes and re-peeled. This capping-re-capping was repeated every three minutes until 10 measuring points were obtained. The results are presented below in Table 16.

Table 16 Three-minute peeling test The average peeling resistance (g / ld) Re peeling 17 (according to the invention) 39 (according to the invention) 40 (according to the invention) 41 (according to the invention) one 721.4 371 710 388.6 2 525.5 492.4 501.8 517.2 3 477.8 477.1 485.8 442.5 four 443.6 474.2 459.1 386.7 5 423 478.1 449.6 346.3 6 392.9 480.0 430.2 313.7 7 374.5 482.5 411.5 295.4 8 352.6 504.7 397.4 255.9 9 332.6 491.8 381.2 224.3 10 326.6 490.3 380.9 204.3

Example 9

A 24-hour interval re-peeling test was performed using the same four Samples according to the invention of Example 7. The samples were initially peeled and opened and the required peeling force was measured. Then the samples were resealed and kept for 24 hours in a controlled environment, i.e. at a temperature of 72 ° F and a relative humidity (RH) of 50%, after which they were re-peeled and reopened. This process was repeated until a total of five measuring points were obtained, or within five days. The results are presented below in Table 17.

Table 17 24-hour peeling test Peeling Force (g / ld) Samples Initial exfoliation Day 1 Day 2 Day 3 Day 4 Day 5 17 (according to the invention) 708.1 616.1 582.3 579.4 653.6 39 (according to the invention) 555.5 641.6 690 752.4 653 40 (according to the invention) 811.7 748.6 666 614.7 546.9 41 (according to the invention) 469.2 513.6 516.8 503.2 479

All four samples retained their peeling values during the five-day test, while none of the samples had an indicator below 400 g / LD on any test day. Samples 39 and 41 actually increased the peeling force and restored the initial peeling force or increased the peeling force during the test period. Thus, due to the fact that these samples remained sealed for at least 24 hours, their ability to adhere was restored or increased.

Example 10

In Example 10, a test similar to the test according to Example 9 was carried out using the four samples described in Example 7; however, after each peeling, the adhesive portion was contacted with coffee beans, resealed and left in this state for 24 hours, and then peeled off again.

After each peeling, whole grains of coffee were placed on the sticky surface and were removed in less than five minutes. Samples were resealed and incubated for 24 hours in a controlled environment, i.e. at a temperature of 72 ° F and OV 50%, after which they were re-peeled and reopened. This process was repeated until a total of five measuring points were obtained, or within five days. The results are presented below in Table 18.

Table 18 24-hour peeling test after contamination with coffee beans The average force of exfoliation (g / ld) Samples Initial exfoliation Day 1 Day 2 Day 3 Day 4 Day 5 17 (according to the invention) 695 507 422.1 344.3 271.5 39 (according to the invention) 627.3 647 571.2 458.6 294.9 40 (according to the invention) 770.4 548.3 412.1 327.3 230,4 41 (according to the invention) 506.9 476.1 382 298.3 211.1

Although there was a slight decrease in peeling resistance, peeling resistance values after five cycles of peeling / contamination with whole coffee grains still exceeded 200 g / ld.

Example 11

The rolling ball test described in Example 4 was performed using a film without adhesive material to compare with the stickiness of a low adhesive adhesive material. The test results are shown further in Table 19. When testing Sample 1, there was a rather sharp turn of the path No. 3 shortly after contact with the film,

Table 19 Uncoated Rolling Ball Test Sample one 2 Path No. 1 16.75 15,875 The path number 2 eighteen eighteen Run path number 3 10,875 14.25 Mileage path number 4 17.25 18,125 Path No. 5 20.25 19,875 The path number 6 fifteen Average 16.35 17.23

It is understood that in the details, materials and design of the package and the process of its formation, described and illustrated in order to clarify the nature of the described packaging, various changes may be made by specialists in the art that do not go beyond the essence and scope of the proposed method, described in the attached formula inventions.

Claims (23)

1. The polymer base, on which is applied UV-cured adhesive material containing: a polymer substrate having an amount of adherence enhancing particles dispersed in at least a portion thereof, The UV-cured adhesive material with low tack has a tack index, in which the path of the ball during the tack test is from about 4 to about 14 inches, the UV-cured adhesive material with low tack is applied to the polymer substrate, at least in part of which are dispersed adhesion promoter particles, and at least a portion of the adhesion enhancing particles located at the interface of the polymer substrate and the low viscosity UV cured adhesive material provides a bond strength of at least about 600 grams per linear inch of UV cured low viscosity adhesive material. 2. The polymer base according to claim 1, wherein the polymer substrate comprises at least a sealing layer on its outer surface, which contains particles of an adhering filler, distributed and arranged in such a way that at least part of them interacts with UV-cured adhesive material and provides adhesion. 3. The polymer base according to claim 2, in which the sealing layer contains a mixture of a copolymer of ethylene and vinyl acetate (EVA), polyethylene and a filler composition containing particles that enhance the adhesion of the filler and the polymer resin carrier. 4. The polymer base according to claim 3, wherein the carrier resin is grafted with maleic anhydride polyethylene, wherein EVA forms a continuous phase with polyethylene, filler particles and grafted with maleic anhydride polyethylene dispersed as a dispersed phase in the continuous phase. 5. The polymer base according to claim 4, in which part of maleic anhydride has an affinity for enhancing the adhesion of the filler. 6. The polymer base according to claim 3, in which the sealing layer contains from about 60% to about 80% EVA, from about 5% to about 20% polyethylene, and from about 3% to about 20% of the filling composition. 7. The polymer base according to claim 2, in which the sealing layer contains from about 0.5% to about 20% of particles enhancing the adhesion of the filler. 8. The polymer base according to claim 6, in which the particles of enhancing the adhesion of the filler is selected from the group including clay, sheet silicates, calcium carbonate, montmorillonite, dolomite, talc, mica and mixtures thereof. 9. The polymer base according to claim 7, wherein the particles of the adherence enhancing filler are montmorillonite modified with surfactants based on ammonium salts. 10. The polymer base according to claim 9, in which organomodified montmorillonite is used in combination with a carrier resin based on polyethylene maleic anhydride grafted. 11. The polymer base according to claim 1, in which the polymer substrate contains about 1000 ppm or less fatty acid amides. 12. The polymer base according to claim 1, in which both the polymer substrate and the UV-cured adhesive material have a surface energy of from about 36 to about 38 dyne / cm ² . 13. The polymer base according to claim 1, in which the polymer substrate and the UV-cured adhesive material have predominantly the same surface energy. 14. The polymer base according to claim 1, in which the polymer substrate contains a multilayer film containing one or more polymer support layers and an outer sealing layer, which contains particles that enhance the adhesion of the filler, while the UV-cured adhesive material is applied to the sealing layer, and the adhesion enhancing particles are distributed and arranged in such a way that at least a part thereof interacts with the UV-cured adhesive material and provides adhesion. 15. The polymer base according to claim 14, in which one or more polymer support layers contains one or more layers of polyethylene. 16. The polymer base of claim 14, wherein the polymer substrate comprises a laminate having a cardboard based component. 17. The polymer base according to claim 16, in which the cardboard-based component has a polymer layer deposited thereon, which contains particles that enhance the adhesion of the filler. 18. The polymer base according to claim 1, in which the polymer substrate with particles of the adhesion-enhancing filler dispersed therein has a higher surface energy compared to the same polymer substrate without particles of the adhesion-enhancing filler, while the adhesion is enhanced by increasing the surface energy. 19. The polymer base according to claim 1, in which the UV-cured adhesive material with low stickiness is located in the spaces formed at least in part of the particles enhancing the adhesion of the filler. 20. The polymer base according to claim 1, in which at least a portion of the particles enhancing the adhesion of the filler extends to the surface of the polymer substrate.

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