WO2021224113A1

WO2021224113A1 - Bactericidal pressure-sensitive adhesive paper

Info

Publication number: WO2021224113A1
Application number: PCT/EP2021/061321
Authority: WO
Inventors: Henning Latz
Original assignee: Amc Ag Advanced Methods Of Coating
Priority date: 2020-05-06
Filing date: 2021-04-29
Publication date: 2021-11-11
Also published as: EP4145998A1; DE202020102560U1

Abstract

The invention relates to a pressure-sensitive adhesive paper, more particularly self-adhesive note (10, 20, 30), comprising: - a first side (1), which has, at least partially, a surface (1a) with a release function; - a second side (2), which is opposite the first side and which has, at least partially, an adhesive layer (6), characterized in that at least parts of the first side (1) and/or at least parts of the second side (2) have a bactericidal component and/or a virucidal component.

Description

Bactericidal pressure sensitive adhesive paper

The invention relates to a pressure-sensitive adhesive paper with a first side, which at least partially has a surface with a release function, and with a second side opposite the first side, which is at least partially coated with an adhesive layer. Such pressure-sensitive adhesive paper is known from the prior art. In particular, pressure-sensitive adhesive paper in the form of sticky notes and page markers have been known objects for many decades, with which written communication can be carried out in the office and other areas or things such as manuscripts or other documents or other objects can be marked and thus sorted - nen.

The object of the present invention is to provide improved pressure-sensitive adhesive paper.

This problem is solved by the subject matter of the independent claim.

By providing bactericidal and / or virucidal components in the surface of the first side of the pressure-sensitive adhesive paper and / or in the surface of the second side of the Pressure-sensitive adhesive paper is advantageously achieved in that the pressure-sensitive adhesive paper of the invention reduces the spread of bacteria and / or viruses and, in the best case, even prevents it.

In particular, if both the surface of the first side and the surface of the second side are provided with bactericidal and / or virucidal components, the spread of bacteria and / or viruses is significantly reduced and, in the best case, prevented, since the bactericidal and / or virucidal components Components in the surfaces mentioned can kill any germs such as bacteria or viruses present on the surfaces mentioned. In this context, the present invention encompasses the knowledge that annotations in the form of the aforementioned pressure-sensitive adhesive paper, for example as an adhesive note on documents, are in certain cases carried out by the first-time user of the pressure-sensitive adhesive paper himself, for example as a memory aid for the first-time user; However, there is at least just as often the case that such attachments of the pressure-sensitive adhesive paper mentioned at the outset are intended for other people. The pressure-sensitive adhesive paper mentioned at the outset can therefore pass through several hands in the form of the aforementioned adhesive notes. This is the case, for example, when corresponding articles are marked with sticky notes for the distribution group in jointly read specialist magazines in an office, so that in case of doubt all persons in such a distribution list can come into contact with the sticky note. As with all objects that are touched by several people, there is a risk of germs such as bacteria or viruses being carried on.

While it was proposed for normal paper in DE 202018002962 to provide the surface and / or undersurface layer with a mechanically applied impregnation made of a substance made from wood from the Pinaceae family to reduce the number of germs, no sticky notes or related products exist so far are designed. In particular, no pressure-sensitive adhesive papers whatsoever have become known from the prior art with which the passing on of germs can be actively avoided. In particular, no pressure-sensitive adhesive papers are known in the prior art which have a bactericidal and / or virucidal surface. This is particularly advantageous for sticky notes because the notes have to be touched vigorously in order to stick and peel them off, resulting in intensive contact and thus an increased risk of germ transmission. The present invention has also recognized, inter alia, that a general problem arises in the production of the adhesive notes, other than that a possibly bactericidal and / or virucidally equipped paper must be used to produce a reliable function of the pressure-sensitive adhesive paper as a bactericidal and / or virucidally effective self-adhesive note Usually on the two opposite sides of a sticky note, usually over the full area or at least in the area of the adhesive coating, the bactericidal / virucidal paper is covered, which significantly damages or completely destroys the bactericidal / virucidal function.

The present invention has now surprisingly found that novel sticky notes with a bactericidal and / or virucidal surface can be made available in that bactericidal and / or virucidal materials can preferably be incorporated into the functional layers, release layer and / or primer layer. Corresponding adhesive notes according to the invention or related products can therefore be produced from conventional papers, but also from papers with a bactericidal or virucidal finish, in which either the release coating on the top of the papers and / or the primer layer and, more preferably, also the adhesive layer with bactericidal and / or or virucidal substances is enriched.

Bactericidal and / or virucidal materials are therefore preferably incorporated into the release layer and into the primer layer. Release lacquer and primer can at least partially penetrate the paper and then effect both a superficial and deeper bactericidal or virucidal finish.

A large number of bactericidally active ingredients can be substituted for the present invention. In addition to the large group of synthetically produced and natural antibiotics, others from natural sources, such as certain types of terpenes, with which plants protect themselves from microbial attacks (e.g. the terpene derivatives thymol, carvacrol and 1,8-cineol), can also be used. It is also possible to use natural substances which contain non-isolated terpenes, such as, for example, pine heartwood extract, see the aforementioned DE 202018002962. Furthermore, natural polymers such as chitosan can be used. In the area of various inorganic materials such as silver derivatives, there are also a large number of substances with a bactericidal or bacteriostatic effect when inserted into paper or into a release or primer layer. An elegant approach wise to destroy germs, with an unusually broad effect against various germs and fungi, without the risk of resistance as in the case of antibiotics, can be found in WO2017 / 167992 A1. The concept there is to bring about the antimicrobial effect by means of photocatalytically generated singlet oxygen. In this context, the invention has recognized that all of the aforementioned bactericidal and / or virucidal components are suitable within the scope of the present invention for finishing the pressure-sensitive adhesive papers of the invention and that the selection of bactericidal additives for finishing the functional layers in sticky notes is not limited. From a practical point of view, because of the generally known problem of bringing antibiotics into the environment, this product class will not be preferred in certain cases for the pressure-sensitive adhesive paper treated here.

In a preferred embodiment, the bactericidal and / or virucidal effect is brought about by means of photocatalytically generated singlet oxygen. Some further embodiments also fulfill the concept of the bactericidal function of the sticky note. For example, when using certain paper properties, such as micro-roughness or surface crepe structure, in coordination with an adapted amount of adhesive, a release lacquer can be completely dispensed with, so that the use of a bactericidally treated paper and the same primer and adhesive have the desired bactericidal and / or virucidal effect is produced.

For the adhesive layer for the pressure-sensitive adhesive papers under discussion here for sticky notes, it is preferred to use adhesives based on polymers of acrylates in a specific embodiment that are rather weakly adhesive. Details can be found in W02009041920 A1, for example. Of these adhesives, it is preferred to use only small amounts of adhesive applied to sticky notes, which are generally limited to 2 to 15 g / m ² , based on the area actually coated with adhesive. Despite the extremely low adhesive strength of sticky notes compared to pressure-sensitive everyday products such as carton sealing tapes, the use of an adhesive-repellent release lacquer layer on the top side is almost always preferred in order to ensure the easiest possible peel-off characteristics even after the sticky note pads have aged.

The present invention includes the knowledge that with a customary application amount of 2.5 to 6 g per square meter of a microsphere adhesive suitable for sticky notes from a paper roughness of 750 ml / min according to Bendtsen (test method ISO 8791-2), a release application is dispensed with can. Sticky notes with the usual amounts of adhesive applied on the basis of paper with a roughness of 750 ml / min and more show an application-oriented, sufficiently low peel force even after prolonged storage.

The invention has further recognized that corresponding pressure-sensitive adhesive papers can also be designed for higher adhesive application weights with a correspondingly higher paper roughness, for which no release application is mandatory.

Pressure-sensitive adhesives are described, for example, in US Pat. No. 3,691,140, namely the problem of the adhesive forces increasing with the bonding time is solved by using so-called pearl polymer adhesives in which the adhesive layer consists of pressure-sensitive microspheres (microspheres). These microspheres have a size of approx. 10 to 250 μm and are therefore considerably larger than the emulsified polymer particles that are used in conventional water-based adhesives (e.g. based on polyacrylates). Due to the geometry, only a small part of the respective surface of the sticky beads comes into contact with the substrate during bonding. Even after pressing and the resulting larger contact area, the rubber-elastic restoring forces of the adhesive microspheres limit the surface contact.

According to US Pat. No. 3,691,140, pearl polymer adhesives are obtained by suspension polymerization of alkyl acrylate monomers and ionic comonomers such as sodium methacrylate in the presence of an emulsifier. Based on the teaching of US Pat. No. 3,691,140, there are further synthetic methods (e.g. US Pat. No. 4,166,152, US Pat. No. 4,645,783, US Pat. No. 5,326,842, US Pat. No. 3,620,988), polymers based on other or functional comonomers (US Pat

4735837, WO00 / 36041), pearl polymer adhesives based on balloon-like or only partially hollow microspheres (US 5405469, US 4,988,567), crosslinked microspheres (US

5714237, WO2009 / 041920, DE 3544882) and formulations with additives (US 3857731). On this basis, the person skilled in the art knows how and within what limits relevant properties of corresponding pearl polymer adhesives (such as, for example, adhesive strength on the respective substrates, tack, anchoring force, shear strength) can be varied (cf. also DE 69929698).

There is also the approach of using normal pressure-sensitive adhesives (ie without microspheres) and printing the geometric effect of the microspheres, for example by printing microscopic, approximately spherical structures using screen printing (cf. DE 3346 100). The invention has further recognized that conventional office papers are generally much smoother and thus typically have a Bendtsen roughness of less than 500 ml / min and therefore a release lacquer coating is preferred if sticky notes are to be produced from them. A preferred embodiment of the invention is characterized in that the first side at least partially has a release lacquer layer, the surface of which at least partially forms part of the surface with the release function.

In a preferred embodiment, the bactericidal and / or virucidal component is incorporated into the release lacquer layer (8).

A preferred embodiment of the invention is characterized in that the release lacquer is applied to an aqueous dispersion of a polymer with long alkyl side chains, for example Resem K-256 from Chukyo Yushi Co., Ltd., 5, Oyashiki, Kobashigata, Ama-shi, Aichi, Japan, 490-1212, a finely divided aqueous dispersion of thymol and an aqueous binder Ligos K4076 from Trinseo Deutschland Anlagengesellschaft mbH, Kölner Strasse 10, 65760 Eschborn.

A preferred embodiment of the invention is characterized in that the release lacquer is based on an aqueous dispersion of fine silver particles of the Akpure W10 brand from RAS AG An der Irler Hoehe 3a, 93055 Regensburg. A preferred embodiment of the invention is characterized in that the surface of the first side with the release function is at least partially formed by an at least partially creped surface of a paper layer on the first side of the pressure-sensitive adhesive paper.

A preferred embodiment of the invention is characterized in that the creped surface is a microcreping of the paper layer, with a Bendtsen roughness of 750 to 1200 ml / min, preferably about 790 ml / min.

A preferred embodiment of the invention is characterized in that the surface of the first side with the release function is formed by a surface of a paper layer of the pressure-sensitive adhesive paper that has a higher roughness. A preferred embodiment of the invention is characterized in that the pressure-sensitive adhesive paper has a paper layer located between the first side and the second side, which is preferably equipped with a bactericidal and / or a virucidal component.

A preferred embodiment of the invention is characterized in that at least parts of the second side (2) have a primer layer (4).

A preferred embodiment of the invention is characterized in that the primer layer (4) is equipped with a bactericidal and / or a virucidal component. Bactericidal and / or virucidal materials are preferably incorporated into the release layer and into the primer layer. A preferred embodiment of the invention is characterized in that the primer layer is a mixture of aqueous acrylic-styrene copolymer dispersion Neocryl A-664 from DSM Coating Resins B.V. Ceintuurbaan 5, 8022 AW Zwolle, The Netherlands, which in turn is mixed with a dispersion of thymol.

A preferred embodiment of the invention is characterized in that the adhesive layer is a coarsely dispersed dispersion of a polyacrylate, microspheres of this dispersion having a diameter in the range from 15 to 80 μm and the application rate 2 to 13 g / m ² being preferred is about 5 g / m ² , more preferably about 4.5 g / m ² .

A preferred embodiment of the invention is characterized in that the pressure-sensitive adhesive paper, as a paper layer, is a standard offset paper with a grammage in the range from 45 to 180 g / m ² , preferably from about 80 g / m ² , more preferably from about 70 g / m ² .

A preferred embodiment of the invention is characterized in that the adhesive layer has a bactericidal and / or a virucidal component. A preferred embodiment of the invention is characterized in that the second side has a primer layer on a surface of the paper layer facing away from the first side only in an area lying between the paper layer and the adhesive layer. A preferred embodiment of the invention is characterized in that the entire second side has a primer layer.

A preferred embodiment of the invention is characterized in that the first side is completely coated with the release lacquer layer, the surface of which forms the surface with the release function.

A preferred embodiment of the invention is characterized in that the first side is coated with a release lacquer layer only in a section that is opposite a section with the adhesive layer on the second side, the surface of which has the aforementioned or part of the surface with the release function forms. Further preferred embodiments of the invention are specified in the subclaims.

Preferred embodiments of the invention will now be described with reference to the drawing. Identical or functionally identical parts are denoted by the same reference symbols. FIG. 1 shows a cross section of a first embodiment of a pressure-sensitive adhesive paper according to the invention;

FIG. 1A shows an alternative to the first embodiment shown in FIG. 1;

FIG. 2 shows a cross section of a second embodiment of a pressure-sensitive adhesive paper according to the invention; and FIG. 3 shows a cross section of a third embodiment of a pressure-sensitive adhesive paper according to the invention.

FIG. 1 shows a cross section of a first embodiment of a pressure-sensitive adhesive paper 10 according to the invention with a first side 1, which has a surface 1a with a release function, and with a second side 2 opposite the first side 1, which at least partially coats with a primer layer 4 is, wherein the primer layer 4 is at least partially coated with an adhesive layer 6 on a surface 4a facing away from the first side. In the illustrated embodiment of Figure 1, the first side 1 has a release lacquer 8 to the surface 1 a with the release function on the first page 1 available. The second side 2 is coated over the entire area with the primer layer 4. The surface 4a of the primer layer 4 facing away from the first side is coated with the adhesive layer 6 in a strip shown on the left in FIG. In the exemplary embodiment of the pressure-sensitive adhesive paper according to the invention shown in FIG. 1, the release lacquer 8 of the release lacquer layer 8 has a bactericidal component, so that the surface 1a of the first side 1 of the pressure-sensitive adhesive paper shown also has a bactericidal component. Furthermore, in the exemplary embodiment shown in FIG. 1, the primer layer 4 is also provided with a bactericidal component, so that the surface 4a of the primer layer 4 also has a bactericidal component.

The embodiment of the pressure-sensitive adhesive paper according to the invention shown in FIG. 1 is an adhesive note 10 consisting of a standard offset paper with a grammage of 80 g / m ² , coated over the entire surface on the first side 1 with a layer 8 of a Release lacquer based on an aqueous dispersion of a polymer with long alkyl side chains (Resem K-256 from Chukyo Yushi), a finely divided aqueous dispersion of thymol and the aqueous binder Ligos K4076 from Trinseo. The underside or second side 2 of the sticky note 10 is also coated over the entire surface. A mixture of the aqueous acrylic-styrene copolymer dispersion Neocryl A-662 (from DSM), which in turn was mixed with a dispersion of thymol, is used here as the primer layer 4. A coarsely dispersed dispersion of a polyacrylate is applied as the adhesive layer 6 to the aforementioned primer layer 4 in the form of strips, the corresponding microspheres having an average diameter of 20 μm. The amount applied is 4.5 g / m ² .

Alternatively, the embodiment of the pressure-sensitive adhesive paper according to the invention shown in FIG. 1 can also be an adhesive note with the materials mentioned in the preceding paragraph, the release lacquer additionally being based on an aqueous dispersion of small silver particles of the Akpure W-10 brand.

FIG. 1A shows an alternative 10a to the first embodiment 10 shown in FIG. 1, in which the pressure-sensitive adhesive paper, in contrast to the first embodiment 10 shown in FIG. In particular, the sticky note 10a of the alternative embodiment of FIG. 1A has the primer layer 4 only between the adhesive layer 6 and the surface 9b of the paper layer 9 on the second side 2 of the sticky note 10a. Opposite the primer layer 4, the first side 1 of the sticky note 10a faces the width of the adhesive layer 6 or primer layer 4 adapted a release lacquer layer 8 with a surface 1aa having a release function, which together with the part of the surface 9a of the paper layer 9 not covered by the release lacquer layer 8 forms the surface 1a with the release function of the sticky note 10a. It is possible that the part of the surface 9a not covered by the release lacquer layer 8 does not have a release function. In this case, the surface 1a having the release function and the surface 1aa of the release lacquer layer 8 would be identical. In the embodiment shown in FIG. 1A, the adhesive layer 6, the release lacquer layer 8 and also a paper layer 9 have bactericidal and / or virucidal components. Alternatively, however, it is possible that only the paper layer 9 has a bactericidal and / or a virucidal component. As a further alternative, it is also possible that only the adhesive layer 6 and the release lacquer layer 8 have a bactericidal and / or a virucidal component.

FIG. 2 shows a cross section of a second embodiment 20 of the pressure-sensitive adhesive paper of the invention. In contrast to the first embodiment 10 shown in FIG. 1, the pressure-sensitive adhesive paper 20 of the second embodiment of FIG. 2 does not have a release lacquer layer 8 having a release lacquer. Instead, a bactericidal paper layer 9 'is provided, the surface 9a of which on the first side 1 of the pressure-sensitive adhesive paper 20 is provided with microcreping and has a Bendtsen roughness of 790 ml / min. Otherwise, the pressure-sensitive adhesive paper 20 of the second embodiment according to FIG. 2 corresponds to the pressure-sensitive adhesive paper 10 of the first embodiment according to FIG. 1.

In the embodiment shown in FIG. 2, the pressure-sensitive adhesive paper forms an adhesive note 20 consisting of a commercially available antimicrobial paper 9 'with a grammage of 70 g / m ² , which is provided with microcreping and a Bendtsen roughness of 790 ml / min and has no release lacquer. The underside or second side 2 of the sticky note 20 is coated over the entire surface with a primer layer 4 for the purpose of a primer effect. A mixture of the aqueous acrylic-styrene copolymer dispersion Neocryl A-662 (from DSM), which in turn was mixed with a dispersion of thymol, is used here. A coarsely disperse dispersion of a polyacrylate is applied as the adhesive layer 6 to the aforementioned primer layer 4 in the form of strips, the corresponding microspheres having an average diameter of 20 μm. The amount applied is 5 g / m ² .

FIG. 3 shows a cross section of a third embodiment 30 of a pressure-sensitive adhesive paper according to the invention. The sticky note 30 of the embodiment of Figure 3 is far different no primer layer 4 in relation to the embodiments described above. Rather, the adhesive layer 6 is directly on the surface 9b of the paper layer 9 of the second side

2 of the sticky note 30 is applied. All of the above-described variants of the other elements of the sticky note 30 can be designed in accordance with the previously described embodiments. In particular, both the adhesive layer 6 and the paper layer 9 and also the release lacquer layer 8 can be made bactericidal and / or virucidal. Alternatively, individual elements of the elements adhesive layer 6, paper layer 9, release lacquer layer 8 can also be non-bactericidal and / or virucidal. In this embodiment, the surface 9a of the paper layer 9 can also have a higher roughness, for example microcreping with a Bendtsen roughness of 750 to 1200 ml / min, preferably about 790 ml / min. Alternatively and not in the figure

3, the release lacquer layer 8 can also be omitted, in particular in the embodiment having an increased roughness on the surface 9a. In such an embodiment, not shown in FIG. 3, the release function on the first page 1 of the sticky note 30 would then be provided exclusively by an increased roughness or microcreping of the surface 9a.

Claims

Expectations

1. Pressure-sensitive adhesive paper, in particular sticky note (10, 20, 30), comprising: a first side (1) which at least partially has a surface (1a) with a release function, a second side (2) opposite the first side, which has at least partially has an adhesive layer (6), characterized in that at least parts of the first side (1) and / or at least parts of the second side (2) have a bactericidal and / or a virucidal component.

2. Pressure-sensitive adhesive paper according to claim 1, wherein the bactericidal and / or virucidal effect is brought about by means of photocatalytically generated singlet oxygen.

3. Pressure-sensitive adhesive paper according to claim 1 or claim 2, wherein the first side (1) at least partially has a release lacquer layer (8), the surface (1aa) of which forms at least part of the surface (1a) with the release function, preferably wherein the bactericidal or / and virucidal component is incorporated into the release lacquer layer (8).

4. Pressure-sensitive adhesive paper according to claim 3, wherein the release lacquer is based on an aqueous dispersion of a polymer with long alkyl side chains, a finely divided aqueous dispersion of essential oil, for example thymol, and an aqueous binder.

5. Pressure-sensitive adhesive paper according to claim 3, wherein the release lacquer is based on an aqueous dispersion of small silver particles.

6. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the surface (1a) of the first side (1) with the release function at least partially through an at least partially creped surface (9a) of a paper layer (9, 9 ') on the first side (1) of the pressure-sensitive adhesive paper is formed.

7. Pressure-sensitive adhesive paper according to claim 6, the creped surface (9a) being a microcreping of the paper layer (9, 9 ') with a Bendtsen roughness of 750 to 1200 ml / min, preferably about 790 ml / min.

8. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the surface (1 a) of the first side (1) with the release function is formed by a surface (9 a) of a paper layer (9, 9) of the pressure-sensitive adhesive paper having a higher roughness.

9. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the pressure-sensitive adhesive paper has a paper layer (9, 9 ') lying between the first side (1) and the second side (2), which is preferably equipped with a bactericidal and / or a virucidal component .

10. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein at least parts of the second side (2) have a primer layer (4).

11. Pressure-sensitive adhesive paper according to claim 10, wherein the primer layer (4) is equipped with a bactericidal and / or a virucidal component, bactericidal and / or virucidal materials preferably being incorporated into the release layer and into the primer layer.

12. Pressure-sensitive adhesive paper according to one of the preceding claims 10 or 11, wherein the primer layer (4) is a mixture of aqueous acrylic-styrene copolymer

Is dispersion, which in turn is mixed with a dispersion of essential oil, for example thymol.

13. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the adhesive layer (6) is a coarsely disperse dispersion of a polyacrylate, microspheres of this dispersion having an average diameter in the range from 15 to 80 μm and the application amount 2 to 13 g / m ² , preferably about 5 g / m ² , more preferably about 4.5 g / m ² .

14. Pressure-sensitive adhesive paper according to one of the preceding claims, the pressure-sensitive adhesive paper having, as a paper layer (9, 9 '), a standard offset paper with a grammage in the range from 45 to 150 g / m ² , preferably about 80 g / m ² , more preferably about 70 g / m ² .

15. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the adhesive layer (6) has a bactericidal and / or a virucidal component.

16. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the second side (2) has a primer layer (4) on a surface facing away from the first side (1) only in an area between the paper layer (9, 9 ') and the adhesive layer (6). 9b) of the paper layer (9, 9 ').

17. Pressure-sensitive adhesive paper according to one of claims 1-15, wherein the entire second side (2) has a primer layer (4).

18. Pressure-sensitive adhesive paper according to one of the preceding claims, wherein the first side (1) is completely coated with a release lacquer layer (8), the surface (1a) of which forms the surface (1a) with the release function.

19. Pressure-sensitive adhesive paper according to one of claims 1-17, wherein the first side (1) is coated with a release lacquer layer (8) only in a section which is opposite a section with the adhesive layer (6) lying on the second side (2) , the surface (1aa) of which forms the aforesaid or a part of the surface (1a) with the release function.