Three-layer UV protection foil for decorative laminates (HPL)

Field of the invention

The present invention relates to novel films for application to materials as protection from the weather. Particularly, the present invention involves a novel, at least three-layer laminate, which is characterized by a particularly good adhesion to the substrate and excellent optical properties. This is a fluoropolymer with the middle layer is a layer of PMMA, containing at least a UV-absorber and/or UV stabilizer and the innermost layer to a layer of PMMA, containing at least a bonding agent, which improves the adhesion to the substrate at the outer layer a layer, containing.

The present invention relates in particular UV protective films for so called high pressure laminates (HPL). To produce this HPL, melamine and phenolic resin can be impregnated papers under high pressure of at least 5 MPa (spec.), temperatures of over 120 ° C and a cycle time, which is usually 30 to 100 min, crimp together. Thus produced composite is here equipped with a decorative top layer. Special appearances, such as wood imitation or uni decors, can be realized.

This decorative laminates are used in many application areas. These include E.g. table tops, door panels, furniture, kitchen countertops and plates for the wall, balcony or cladding. While in the interior applications, special UV protection is needed, the melamine resin surface in the field with a protective layer must be equipped in addition, because pure melamine resin surfaces have a unique degradation after only a relatively short time. An improvement in particular of the

Weather and UV resistance of HPL for outdoor use is the area of the present invention.

State of the art

A suitable, i.e. especially long-lasting protection of the HPL can be achieved with the simultaneous pressing of a UV protective film on the basis of poly(methyl)methacrylat. In a specific embodiment the outside of the UV-protective film is equipped with a PVDF coating in addition, the pollution behavior, as well as the

To improve the chemical resistance of the overall network.

In the field, however noted that the purely physical adhesion of UV protective film with the reactive resin insufficient coated papers, to ensure a Federation stable over years. Through weathering a partially observed after only a few years to even complete delamination of the film from the HPL surface.

It was the task to develop a UV-protection, in combination with the reaction resin a stable Federation realize allows impregnated papers, which has sufficient UV resistance.

Was solved this technical task, for example, in the EP 1 664 191 as a result that it the film page, the impregnated with the melamine paper pressed will be, with a

Adhesion promoter equips for example on the basis of acid outcropped. The anhydride is a functional group in a polymethacrylate. At HPL pressing the anhydride reacts with the melamine resin via a Nucleophilic addition. The combination of physical and chemical connections of the film as well as the use of a UV protection package, so decorative can produce high pressure laminates that are resistant in the field over the years. These films in accordance with EP 1 664 191 as carriers with a PVDF outer layer are available optionally. However several disadvantages were revealed recently, particularly for the carriers. These occur particularly when very long use or when an artificial weathering carried out to compare the appropriately equipped HPLs. In these had

Carriers directly after pressing a so-called Blue shimmer, i.e. a in the trending bluish discoloration on. To get to this effect, the Coexfolie can be equipped also with very small amounts of adhesive brokers. Such, in no or only very small glimmer of blue films exists according to the weather conditions but a delamination between the Coexschichten or to the actual HPL. Often two effects delamination and blue shimmer - could be observed, but at a higher proportion of custody mediator is rather a tendency to the blue shimmer and delamination of the COEX-layers, and to observe a tendency for the delamination to the HPL in small amounts.

US 2008/031 1406 describes a three-layer film, which is constructed from: A.) a PVDF outer layer, B.) a second layer, consisting of a PVDF / PMMA blend which contains UV absorbers, such as E.g. Tinuvin 234, and C.) a bonding agent layer which contains an anhydride of methacrylic acid. The film is characterized in particular by that these no white discoloration and also in connection with melamine resin-soaked paper has a good adhesion in water storage test for 2 h at 100 ° C. However, the high proportion of PVDF in the intermediate layer B represents an economic disadvantage.

Task

Object of the present invention therefore was in regard to the State of technology, to make a new film that has no delamination, no blue Sheen and excellent optics, E.g. with a low haze, also in the long term outdoor use under the influence of weather conditions on the remuneration of HPLs available.

In particular, it was object of the present invention to provide that when Grouting on the HPL a novel foil for HPLs a good start as well as

Has long-term liability.

In addition, providing a film was in addition to a high own,

Weathering stability ensures adequate protection for weather-sensitive items, such as HPLs, against moisture, wind, solar radiation, and in particular UV radiation, object of the present invention.

More not explicitly mentioned tasks arise from the following description and the examples and the claims of the present book.

Solution

The tasks are solved by the provision of a new UV-protective film that is suitable to crimp on HPL (HPLs). This protector has following interconnected layers from the outside to the inside: a layer A, containing a fluoropolymer, a PMMA layer B, containing at least a UV stabilizer and/or absorber and a layer of C, containing at least a bonding agent and at least a poly(meth)acrylat prefers the layers of B and C both at least a UV stabilizer and/or absorber on.

This can the layer C with a resin impregnated paper, be grouted prefers with a melamine resin-soaked paper to an HPL. Continue to the film this is characterized, that the layers of B or C layer at least one

Schlagzähmodifizierungsmittel has. Optionally, both layers of B and C of at least a such shock resistant modification agent may exhibit. Prefers the layer has A thickness between 1 and 25 μιτι, prefers between 5 and 20 μιτι, the layer B prefers a thickness between 15 and 125 μιτι, preferably between 10 and 100 μιτι, particularly between 10 and 60 and layer C prefers a thickness between 1 and 25 μιτι, between 5 and 20 μιτι, on.

Surprisingly invention building protection films found that by decoupling the adhesion layer C fluorine polymer layer A require all for the production of HPL technical features, such as a high chemical resistance, high UV protection, a good chemical connection or a very good optical appearance, are met, and with the protection foil equipped HPL Additionally directly after pressing , after weathering has a blue sheen. After weathering, also a delamination is very rarely and when compared to the State of the art in the significantly reduced mass to watch.

Invention according to the invention protection films for the production of HPL's are for the production of so-called MPL (medium pressure laminates) or so-called CPL (continuous pressure laminates) suitable. MPL produced compared to HPL at lower pressures or temperatures. CPL are manufactured under the same conditions as HPL, only with shorter cycle times between 2 and 30 min.

In the layers B and/or C, preferably in layer B or in layers (B) and (C) the UV-stabilization contained UV stabilizers is usually to sterically hindered Amine (hindered amine light stabilizer;) HALS-Verbindungen). Alternatively or additionally contain UV absorbers it can be to Benzophenone, Salicylsäureester, Cinnamic acid ester, Oxalanilide, Benzoxazinone, Hydroxyphenylbenztriazole, triazine, Benztriazole or Benzal malonate, prefers to triazine or Benztriazole and especially prefers a mixture of Triazines and Benztriazolen. Alternatively, UV absorber also using a polymerization-active group in the matrix material can be a cure. A detailed listing of suitable connections and their preferred concentration in PMMA layers as layer B, can be found in EP 1 963 415.

The shock resistant modifying agents in the layers of B or C is preferred to core shell or core Shell Shell particles. Preferably at least a shell consists of a poly(meth)acrylat. Particles with a soft core are especially preferred, i.e. prefers a core below preferred a glass transition temperature ° C, 0 below-10 ° C and a dish with a glass transition temperature of 20 ° C, 70 ° c. Usually the soft phase consists in mainly

Acrylatwiederholungseinheiten with 1 to 6 carbon atoms in the Alkylrest and the hard phase mainly from MMA repeating units. The Schlagzähmodifizierungsmittel have preferred an average particle diameter of 10 to 150 nm. The determination of the

Particle diameter in the case of Schlagzähmodifizierungsmittel measurements according to the Ultracentrifuge method. A more detailed description of suitable

Schlagzähmodifizierungsmittel for a PMMA matrix material can be found in WHERE 2007/073952.

Schlagzähmodifizierungsmittel has proved a particularly favorable, after a a described in the European patent application with the file number 13193654.4

Procedures have been processed.

The impact resistant modified poly(meth)acrylat-Kunststoff of the PMMA layer B is usually from 20 to 80 WT %, preferred from 30 to 75 wt % of the PMMA matrix material and from 20 to 80 WT %, preferred Schlagzähmodifizierungsmittel from 25 to 70 WT %. These details are aggregates, as for example de-icing salt, matting agent and any other additives or dyes are not included.

In the PMMA matrix material in layer B and at the poly(meth)acrylat in layer C are Alkylacrylate prefers to a polymer which is obtained through a polymerization of a composition consisting of from 80 to 100 WT % methyl methacrylate and one or more other ethylenisch unsaturated, radical polymerisierbarer Monomerer, 0 to 20 Gew.-% preferred. The PMMA layer B and the poly(meth)acrylat in layer C can be identical or different with regard to composition or molecular weight. These polymers are referred to without taking into account the Schlagzähmodifizierungsmittel as matrix materials. A provision for establishing appropriate

Matrix materials and a collection of usable Comonomers can be found in EP 1 963 415.

In a specific embodiment, the layer B is a mechanically resilient layer of PMMA. This means that the used PMMA matrix material has a very high molecular weight. This high molecular weight is between 100 000 and 200 000 g / mol, preferably from 120 000 to 170 000 g / mol.

The strata A, B, and C of the invention protection film can contain further aggregates, such as dyes, processing aids or other stabilizers of the described components.

The fluoropolymer layer A is preferred to PVDF, PVF, PETFE

(Polyethylene tetrafluorethylen) or PFEVE (Polyfluorethylenvinylether). In particular prefers this fluoropolymer is 5 a predominantly amorphous or a microcrystalline PVDF with a haze smaller. It is especially beneficial if the layer is A exclusively of PVDF and optional additives. These additives can be, for example, to more UV protection medium, pigments, matting agents, stabilizers, or scratch protection additives.

Are examples of excellent PVDF types with correspondingly low haze® 9009 of company Solvay and Kynar Solef® 9000HD of company Arkema. The haze will cause a 30 μιτι thick pure fluoropolymer (PVDF) film at 23 ° C according to ASTM D1003 measured.

C layer contains preferably between 5 and 99 WT %, particularly preferably between 10 and 60 WT %, and in particular prefers between 15 and 40 WT % bonding agent. Prefers the bonding agent in layer C as a copolymer, showing up at least a (meth) acrylate and a copolymerisierbares anhydride, and/or a copolymerisierbare Diacid, exists. Especially

preferably, the bonding agent is a copolymer of MMA, styrene and

Maleic anhydride. A composition has proven very beneficial, preferably containing 5 to 40 WT %, 8 to 20 WT % maleic anhydride as a copolymerisierte component. Such a bonding agent may in particular by means of Substanz-or

Produced by solution polymerisation.

Surprisingly, it was found that an invention protection foil even after

Long term weathering does not tend to a delamination, while a slide that consists only of the layers A and C, a significantly high proportion delaminates after a long term weathering. This is among other things on the styrene content in the used adhesive

due to. It is thus particularly surprising that the same adhesion promoter in the invention protection foil with significantly reduced tendency to delamination can be used.

Still, it can be observed that layers result in A, which consist of a PVDF with a small amount of (micro) crystalline and thus particularly low haze, the direct coextrusion with the described composition of layer C Fließinhomogenitäten, which are visible in the final product as a strip. Surprisingly, it was found that a corresponding, invention protection film with the additional layer of B does not have this strip.

The inventive protective film can by means of lamination using a cast process or-bevorzugt – manufactured via coextrusion are. Preferred method of making the invention protection film is a Mehrschichtcoextrusion.

In a specific embodiment, the layer of A can be structured in addition on the surface. Such structures can be for example larger wells, grain or

Matting? In particular the structuring by means of appropriately structured press surfaces, E.g. in the form of metal plates, pressing the invention protection foil on a resin-impregnated paper be realized at the can. It is also a

Protector, a such structured layer A showing up, a preferred embodiment of the present invention.

In addition to the invention protection foil is also their use in the form of a process for the manufacture of HPLs, MPLs or CPLs part of the present invention. In particular, the use of the invention protective film for the production of HPLs part of the present invention is. In particular this usage in the context of a procedure is carried out, where the backing paper with melamine and phenolic resin-soaked, prefers directly on a melamine-resin with a pressure-soaked decor paper > 5 MPa at temperatures > 120 ° C with a cycle time between 30 and 100 min is pressed.

The resin impregnated papers may exist in particular multi-layer. Embodiments where multiple layers with a phenolic resin are soaked and at least one layer which is soaked with a Melanimharz lies between them and the protective film are particularly widespread. This layer is also dyed or printed and thus represents a

Decor layer dar. It is also possible that as a decorative layer a thin layer made of melamine resin is impregnated Echtholzfunier, on which the protective foil is then pressed.

When the Grouting of the protective film on the resin impregnated papers, two options are available. For one, the protective film on the prepackaged, so pressed HPL, MPL or CPL can be pressed. In this variant, the Grouting can be done within a shorter time. It is however preferred that the pressing of the layers of paper and the connection with the protective film in the same step be. With this variant you are advantageous stated cycle times.

Examples

The weathering testing were carried in the form of a Xenotests beta LM of the company Atlas according to DIN EN ISO 4892-2, method A, cycle 1. Optical and mechanical evaluations were carried out after 0 h, 1000 h, 2500 h, 3333 h, 10 000 h and 15 000 h.

Alternatively, an accelerated procedure in accordance with DIN EN ISO 4892-2, method A, was cycle 1, but with a black standard temperature of 70 ° C +/-5 ° C, a

Sample room temperature of 40 ° C +/-5 ° C as well as a UV irradiation power of 180 W / m2 in the range of wavelength from 300 to 400 nm performed. Optical and mechanical

Assessments were made after 0 h, 333 h, 833 h, 1666 h, 2500 h, 3333 h and 5000 h.

The haze has been determined in accordance with ASTM D1003 at 23 ° C. The measurements for the determination of the haze of fluorine polymers were made to a corresponding 30 μιτι thick Mono film

As UV stabilizer package, a mixture of 46.3 WT % Tinuvin® 360 was 18.7 WT %,

Sabostab® 1 19FL and 35.0 WT % Tinuvin® 1600 used.

The HPL was by simultaneously pressing of the resin soaked

Layers of paper and the protective films set up. The core layer consisted of phenolic resin impregnated paper. A decorative paper impregnated with Melanimharz lay between them and the protective film. A first HPL was used when the results in accordance with table 1. An analog-based, anthracite coloured HPL was used when the results in accordance with table 2.

The protectors was Adaptercoextrusion about the chill-roll process is alternatively a production about a Mehrkanalcoextrusion or a combination of adapter and Mehrkanalcoextrusion conceivable.

As a bonding agent, a copolymer of 75 WT % MMA was 15 WT % styrene and 10 WT %,

Maleic anhydride is used. This copolymer had a weight-average molecular weight Mw of ca 100 000 g / mol (determined by GPC against a PMMA standard).

General information here were used to the PMMA in the layers of B and C: matrix materials with acrylic. The acrylic is core shell or core Shell Shell particles. Because the outer shell of these particles each fully mingles with the matrix material, the respective outer shells are the following to the compositions included in the matrix material and the acrylic only the core of a core shell particle or the core, and the inner shell of a core Shell Shell particle. This proportion is hereinafter referred as soft phase. This includes also optional "hard" cores in a core Shell Shell particles.

PMMA was in layer B and C: in layer B and C – if not otherwise stated - a high-impact-modified polymer, containing a PMMA matrix material from 92.8 WT % MMA, 7.3 WT % of butyl acrylate and 0.8 WT % MA, as well as the soft phase of Kern-(Schale-)Schale-(meth)acrylats is employed as an acrylic.

Comparison example 1, the PMMA matrix material of layer C consisted of derogation from 92 WT % MMA and 8 WT % butyl acrylate.

In examples 1 and 2, the PMMA matrix material of layer each consisted of 96 WT % MMA, 0.9 WT % ethyl acrylate and 3, 1 WT % methyl acrylate B.

Comparison example 1:

Layer A: 5 μηη Kureha KF polymer T850 (PVDF) with a haze of 1 1, 8

SHIFT C: 45 μηη thick layer of 51, 1 WT % PMMA matrix material, 20 WT % bonding agent, 26 WT % soft phase and 2.9 WT % UV stabilization package. The acrylic was a core-shell particles.

The HPL after the Grouting and a weathering 3333 h in the Xenotest Alpha-high-energy showed a significant loss of adhesion between the layers A and C (delamination).

Comparative example 2:

Layer A: 5 μηη Solef® 9009 with a haze of 2.98.

Layer soft phase and 1.8 WT % UV stabilizer package C: 45 μηη thick layer 59.2 WT % PMMA matrix material, 15 WT % bonding agent, 24 WT %. The acrylic was a core-shell particles.

The HPL showed a distinct blue glow after the Grouting.

Example 1:

Layer A: 5 [in the Solef® 9009]

SHIFT B: 40 μηη thick layer of 65.5 WT % PMMA matrix material, 32.4 WT % soft phase of core Shell Shell particle and 2, 1 WT % UV stabilization package.

SHIFT C: 5 μηη thick layer 59.2 WT % PMMA matrix material, 15 WT % bonding agent, 24

WT % soft phase and 1.8 WT % UV stabilization package. The acrylic was a core-shell particles.

Example 2:

Layer A: 5 [in the Solef® 9009]

SHIFT B: 40 μηη thick layer of 65.5 WT % PMMA matrix material, 32.4 WT % soft phase of core Shell Shell particle and 2, 1 WT % UV stabilization package.

SHIFT C: 5 μιτι thick layer of 55.5 WT % PMMA matrix material, 20 WT % adhesion promoters,

22.8 WT % soft phase and 1, 7 WT % UV stabilization package. The acrylic was a core-shell particles.

Example 3:

Layer A: 5 [in the Solef® 9009]

SHIFT B: 40 μηη thick layer of 69.4 WT % PMMA matrix material, 28.5 WT % soft phase of core Shell Shell particle and 2, 1 WT % UV stabilization package.

SHIFT C: 5 μιτι thick layer of 55.5 WT % PMMA matrix material, 20 WT % adhesion promoters,

22.8 WT % soft phase and 1, 7 WT % UV stabilization package. The acrylic was a core-shell particles.

Example 4:

Layer A: 5 [in the Solef® 9009]

SHIFT B: 40 μηη thick layer of 69.4 WT % PMMA matrix material, 28.5 WT % soft phase of core Shell Shell particle and 2, 1 WT % UV stabilization package.

Layer 5 μηη layer 59.2 WT % PMMA matrix material, 15 WT % bonding agent, 24 WT % C: soft phase and 1.8 WT % UV stabilization package. The acrylic was a core-shell particles.

Results table 1

UV-Schutzfciie BSP 1 BSP. 4 Vergliche-

"Blue glow" ++++-h20 bearing test1 2 h ++++

@ 100 ° C

(Haze)

H20 bearing er test +++++ 48 h @ 65 ° C

) Adhesion test / lattice interface test: passed

Results table 2

UV protective film BSP. 1 BSP. 2 BSP. 3 BSP. 4 comparison

Alpha Bewitterung +++ 0

High-Energy nach

3333 h

H20-Lagertest1 2 h ++++

@ 100 ° C

(Haftverlust)

H20-Lagerertest +++++ 48 h @ 65 ° C

CLAIMS

A method performed by a first device (121), for sending data in a Device-to-Device, D2D, transmission to a second device (122), the method comprising:

identifying (301) a priority level of the D2D transmission,

mapping (302) the identified priority level to a resource pool index, which resource pool index identifies a resource pool among a plurality of resource pools associated with different priority levels,

sending (303) the data in the D2D transmission to the second device (122) using the resources in the resource pool identified by the resource pool index.

The method of claim 1 , wherein the priority level is a function of characteristics of the D2D transmission, which characteristics comprise at least one of: a type of communication, a type of device, and a type of resource allocation.

The method of claim 2, wherein the type of communication is one of: an emergency type of communication, a commercial type of communication, a unicast type of communication, a multi-cast type of communication and a broadcast type of communication.

The method of any of claims 2-3, wherein the type of resource allocation is one of: random resource selection, Carrier Sense Multiple Access, CSMA, -based resource selection, energy-sensing based resource selection and contention- resolution based resource selection.

The method of any of claims 2-4, wherein the type of device is one of different respective device releases of a Third Generation Partnership Project ,3GPP, standard and wherein different resource pools out of the plurality of resource pools are associated with the different respective device releases of the 3GPP standard and associated with different respective resource pool indexes.

6. The method of any of claims 1 or 2, wherein the priority level is a function of

characteristics of the D2D transmission, which characteristics comprise at least one of: a destination address of the D2D transmission, properties of the destination address of the D2D transmission and a type of application.

The method of any of claims 1-6, wherein the priority level is a function of the transmission type such that different resource pools out of the plurality of resource pools are associated with different respective transmission types and associated with different respective resource pool indexes.

The method of any of claims 1-7, wherein the plurality of resource pools include a Scheduling Assignment, SA, resource pool, a mode-2 data resource pool, a mode- 2 SA resource pool and/or a type-1 discovery resource pool.

The method of any of claims 1-8, wherein information about resource pool indexes identifying each respective resource pool comprised in the plurality of resource pools associated with different priority levels is signaled to the first device (121) from a network node (130).

10. A method performed by a second device (122), for receiving data in a Device-to- Device, D2D, transmission from a first device (121), the method comprising:

receiving (403) the data in the D2D transmission from the first device (121), using resources in a resource pool identified by a resource pool index,

wherein a priority level of the D2D transmission is mapped to the resource pool index, which resource pool index identifies a resource pool among a plurality of resource pools associated with different priority levels.

1 1. The method of claim 10, wherein the priority level is a function of characteristics of the D2D transmission, which characteristics comprise at least one of: a type of communication, a type of device, and a type of resource allocation.

12. The method of claim 1 1 , wherein the type of communication is one of: an

emergency type of communication, a commercial type of communication, a unicast type of communication, a multi-cast type of communication and a broadcast type of communication.

13. The method of any of claims 1 1-12, wherein the type of resource allocation is one of: random resource selection, Carrier Sense Multiple Access, CSMA, -based resource selection, energy-sensing based resource selection and contention- resolution based resource selection.

14. The method of any of claims 11-13, wherein the type of device is one of different respective device releases of a Third Generation Partnership Project, 3GPP, standard and wherein different resource pools out of the plurality of resource pools are associated with the different respective device releases of the 3GPP standard and associated with different respective resource pool indexes.

15. The method of any of claims 10 or 1 1 , wherein the priority level is a function of characteristics of the D2D transmission, which characteristics comprise at least one of: a destination address of the D2D transmission, properties of the destination address of the D2D transmission and a type of application.

16. The method of any of claims 10-15, wherein the priority level is a function of the transmission type such that different resource pools out of the plurality of resource pools are associated with different respective transmission types and associated with different respective resource pool indexes.

17. The method of any of claims 10-16, wherein the plurality of resource pools include a Scheduling Assignment, SA, resource pool, a mode-2 data resource pool, a mode-2 SA resource pool and/or a type-1 discovery resource pool.

18. A first device (121) for sending data in a Device-to-Device, D2D, transmission to a second device (122), the first device (121) comprising:

a processor (720) configured to:

identify a priority level of the D2D transmission,

map the identified priority level to a resource pool index, which resource pool index identifies a resource pool among a plurality of resource pools associated with different priority levels, and

send the data in the D2D transmission to the second device (122) using the resources in the resource pool identified by the resource pool index.

19. The first device (121) of claim 18, wherein the priority level is a function of characteristics of the D2D transmission, which characteristics comprise at least one of: a type of communication, a type of device, and a type of resource allocation.

20. The first device (121) of claim 19, wherein the type of communication is one of: an emergency type of communication, a commercial type of communication, a unicast type of communication, a multi-cast type of communication and a broadcast type of communication.

21. The first device (121) of any of claims 19-20, wherein the type of resource

allocation is one of: random resource selection, Carrier Sense Multiple Access, CSMA, -based resource selection, energy-sensing based resource selection and contention-resolution based resource selection.

22. The first device (121) of any of claims 19-22, wherein the type of device is one of different respective device releases of a Third Generation Partnership Project, 3GPP, standard and wherein different resource pools out of the plurality of resource pools are associated with the different respective device releases of the 3GPP standard and associated with different respective resource pool indexes.

23. The first device (121) of any of claims 18 or 19, wherein the priority level is a

function of characteristics of the D2D transmission, which characteristics comprise at least one of: a destination address of the D2D transmission, properties of the destination address of the D2D transmission and a type of application.

24. The first device (121) of any of claims 18-23, wherein the priority level is a function of the transmission type such that different resource pools out of the plurality of resource pools are associated with different respective transmission types and associated with different respective resource pool indexes.

25. The first device (121) of any of claims 18-24, wherein the plurality of resource pools comprise a Scheduling Assignment, SA, resource pool, a mode-2 data resource pool, a mode-2 SA resource pool and/or a type-1 discovery resource pool.

26. The first device (121) of any of claims 18-25, wherein the first device (121) is further configured to receive information about resource pool indexes identifying each respective resource pool comprised in the plurality of resource pools associated with different priority levels from a network node (130).

27. A second device (122), for receiving data in a Device-to-Device, D2D, transmission from a first device (121), the second device (122) comprising:

a processor (820) configured to;

receive the data in the D2D transmission from the first device (121), using resources in a resource pool identified by a resource pool index,

wherein a priority level of the D2D transmission is mapped to the resource pool index, which resource pool index identifies a resource pool among a plurality of resource pools associated with different priority levels.

28. The second device (122) of claim 27, wherein the priority level is a function of

characteristics of the D2D transmission, which characteristics comprise at least one of: a type of communication, a type of device, and a type of resource allocation.

29. The second device (122) of claim 28, wherein the type of communication is one of: an emergency type of communication, a commercial type of communication, a unicast type of communication, a multi-cast type of communication and a broadcast type of communication.

30. The second device (122) of any of claims 28-29, wherein the type of resource

allocation is one of: random source selection, Carrier Sense Multiple Access, CSMA, -based resource selection, energy-sensing based resource selection and contention-resolution based resource selection.

31. The second device (122) of any of claims 27-33, wherein the type of device is one of different respective device releases of a Third Generation Partnership Project, 3GPP, standard and wherein different resource pools out of the plurality of resource pools are associated with the different respective device releases of the 3GPP standard and associated with different respective resource pool indexes.

32. The second device (122) of any of claims 27 or 28, wherein the priority level is a function of characteristics of the D2D transmission, which characteristics comprise at least one of: a destination address of the D2D transmission, properties of the destination address of the D2D transmission and a type of application.

33. The second device (122) of any of claims 27-32, wherein the priority level is a

function of the transmission type such that different resource pools out of the plurality of resource pools are associated with different respective transmission types and associated with different respective resource pool indexes.

34. The second device (122) of any of claims 27-32, wherein the plurality of resource pools include a Scheduling Assignment, SA, resource pool, a mode-2 data resource pool, a mode-2 SA resource pool and/or a type-1 discovery resource pool.