Flame-retardant adhesive film and decorative film material

Abstract

To provide a halogen-free flame-retardant adhesive film and decorative film material.SOLUTION: A flame-retardant adhesive film is formed of a resin composition containing no halogen, wherein the resin composition contains 12 wt.% to 55 wt.% of a first polyolefin resin, 20 wt.% to 60 wt.% of a second polyolefin resin, 3 wt.% to 15 wt.% of a phosphorus compound having a spiro structure, and 15 wt.% to 30 wt.% of a flame retardant compound. The content of the phosphorus atom in the first polyolefin resin is 0.1 wt.% to 1.0 wt.%. The second polyolefin resin contains an ethylene polymer and a propylene polymer. The flame retardant compound contains a phosphorus-based flame retardant, and further contains at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flame-retardant adhesive film and a decorative film material, and particularly to a halogen-free flame-retardant adhesive film and a decorative film material.

Background Art

[0002] Many existing flame-retardant adhesive films add a halogen-containing flame retardant to a polyolefin resin. Although the halogen-containing flame retardant has an excellent flame-retardant effect, it generates toxic gases and thick smoke during combustion, which is harmful to the human body and the environment. Therefore, this type of material cannot be used for indoor building materials. Furthermore, as environmental protection awareness increases, all related parties are working hard on the research of alternative materials.

[0003] Therefore, finding a method to replace the existing halogen-containing flame retardant and improve the flame-retardant effect of polyolefin resin by improving the material components has become one of the important issues in this field.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technical problem to be solved by the present invention is to provide a flame-retardant adhesive film and a decorative film material that make up for the deficiencies of the existing technology.

Means for Solving the Problems

[0005] In order to solve the above technical problems, one of the technical means adopted in the present invention is to provide a flame-retardant adhesive film. The flame-retardant adhesive film is formed of a halogen-free resin composition, and the resin composition contains 12 wt% to 55 wt% of a first polyolefin resin, 20 wt% to 60 wt% of a second polyolefin resin, 3 wt% to 15 wt% of a phosphorus compound having a spiro structure, and 15 wt% to 30 wt% of a flame retardant compound. The content of phosphorus atoms in the first polyolefin resin is 0.1 wt% to 1.0 wt%. The second polyolefin resin includes an ethylene polymer and a propylene polymer. The flame retardant compound includes a phosphorus-based flame retardant, and further includes at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant.

[0006] Furthermore, the first polyolefin resin is obtained by reacting a phosphorus compound with a polyolefin, and the weight ratio of the phosphorus compound to the polyolefin is 1:10 to 1:100.

[0007] Furthermore, the phosphorus compound is selected from the group consisting of a phosphate ester having a vinyl group and a phosphate ester having a biphenyl group.

[0008] Furthermore, the phosphorus compound is a phosphorus compound having a biphenyl group and a hydroxy group.

[0009] Furthermore, the phosphorus compound is selected from the group consisting of 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide and 10-(2,5-dihydroxyphenyl)-10-hydroxy-9-oxa-10-phospha-phenanthrene-10-oxide.

[0010] Furthermore, the polyolefin is selected from the group consisting of polyethylene, polypropylene, and polybutene.

[0011] Furthermore, the terminal of the polyolefin has an epoxy group.

[0012] Furthermore, the first polyolefin resin has one functional group, and the functional group is selected from the group consisting of a vinyl group and a biphenyl group.

[0013] Furthermore, the phosphorus atom content of the phosphorus compound having a spiro structure is from 7 wt% to 15 wt%.

[0014] Furthermore, the phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl)pentaerythritol diphosphate.

[0015] Furthermore, the phosphorus-based flame retardant includes a core layer and a surface layer covering the core layer, and the surface layer is a carbon layer.

[0016] Furthermore, the core layer is formed from polymetaphosphoric acid.

[0017] Furthermore, the nitrogen-based flame retardant is melamine or its derivative.

[0018] Furthermore, the silicon-based flame retardant is silicon dioxide or silane.

[0019] Furthermore, the boron-based flame retardant is borate.

[0020] Furthermore, the metal inorganic flame retardant is selected from the group consisting of magnesium oxide, aluminum oxide, and calcium carbonate.

[0021] Furthermore, the density of the flame-retardant adhesive film is 0.9 g / cm 3 to 1.3 g / cm 3 .

[0022] Furthermore, the phosphorus atom content of the entire flame-retardant adhesive film is from 1.25 wt% to 2.0 wt%. To solve the above technical problems, another technical means adopted in the present invention is to provide a decorative film material. The decorative film material includes the flame-retardant adhesive film and a pattern layer provided on the flame-retardant adhesive film.

[0023] One beneficial effect of the present invention is that the flame-retardant adhesive film and the decorative film material provided by the present invention can improve the flame retardancy of the flame-retardant adhesive film by means of the technical means that "the resin composition contains a first polyolefin resin, a second polyolefin resin, a phosphorus compound having a spiro structure, and a flame retardant compound" and that "the content of phosphorus atoms in the first polyolefin resin is from 0.1 wt% to 1.0 wt%".

[0024] To better understand the features and technical content of the present invention, the following provides a detailed description of the present invention and reference to the accompanying drawings. However, the provided accompanying drawings are only for reference and explanation purposes and are not for limiting the scope of the claims of the present invention.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0026] The following describes the embodiments disclosed by the present invention in specific examples of the "flame-retardant adhesive film and decorative film material" according to the present application. Those skilled in the art can understand the merits and effects of the present invention from the disclosed content of this specification. The present invention can be implemented or applied in other different embodiments. Each detail in this specification can also be equivalently modified and changed based on various viewpoints or applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are for simple and schematic explanation purposes and do not show actual dimensions. In the following embodiments, the technical matters related to the present invention are further described, but the disclosed content does not limit the present invention. Also, the term "or" used in this specification may include any one or a combination of multiple items according to the actual situation.

[0027] In order to overcome the problems of toxic gases and thick smoke generated when using a halogen-containing flame retardant, the present invention provides a flame-retardant adhesive film and a decorative film material. The flame-retardant adhesive film and the decorative film material of the present invention do not use a halogen-based flame retardant, but still have a good flame-retardant effect.

[0028] The present invention uses a special flame-retardant additive and combines it with a specific polyolefin material to form a resin composition by mixing. This resin composition can be used to manufacture a flame-retardant adhesive film with good flame-retardant properties through a coating machine, and further, a decorative film material with good flame-retardant properties can be manufactured. It combines the beauty and safety of the interior and can replace the existing halogen-containing flame-retardant adhesive film.

[0029] Please refer to FIG. 1. The flame-retardant adhesive film 1 of the present invention is manufactured from a resin composition by a coating machine. In the example, the thickness of the flame-retardant adhesive film 1 can be from 0.25 mm to 0.75 mm, but the present invention is not limited thereto.

[0030] The resin composition of the present invention does not contain halogen. Taking the total weight of the resin composition as 100 wt%, the resin composition contains 12 wt% to 55 wt% of a first polyolefin resin, 20 wt% to 60 wt% of a second polyolefin resin, 3 wt% to 15 wt% of a phosphorus compound having a spiro structure, and 15 wt% to 30 wt% of a flame retardant compound.

[0031] The first polyolefin resin, the phosphorus compound having a spiro structure, and the flame retardant compound contain phosphorus atoms, and by their synergistic action, the flame-retardant adhesive film can have a better flame-retardant effect. Specifically, based on the total weight of the entire flame-retardant adhesive film (100 wt%), the phosphorus atom content in the flame-retardant adhesive film is 1.25 wt% to 2.0 wt%, but the present invention is not limited thereto.

[0032] The first polyolefin resin and the second polyolefin resin are the main components of the flame-retardant adhesive film. With the total weight of the resin composition being 100 wt%, the total content of the first polyolefin resin and the second polyolefin resin exceeds 70 wt%. In an example of the embodiment, the content of the second polyolefin resin is equal to or more than the content of the first polyolefin resin.

[0033] [First polyolefin resin] By adding the first polyolefin resin, the flame-retardant effect of the resin composition is improved, and the first polyolefin resin contains 0.1 wt% to 1.0 wt% of phosphorus atoms.

[0034] Specifically, the first polyolefin resin has a phosphorus-containing functional group. The phosphorus-containing functional group gives a good flame-retardant effect to the resin composition and improves the compatibility between the flame retardant compound and the second polyolefin resin.

[0035] The first polyolefin resin is obtained by reacting a phosphorus compound, a polyolefin, and a peroxide at a temperature of 160°C to 240°C. That is, after the polyolefin is modified by the phosphorus compound, the first polyolefin resin is formed, and thereby the first polyolefin resin is imparted with a flame-retardant effect. In other words, the first polyolefin resin is modified with a phosphorus-containing functional group.

[0036] The weight ratio of the phosphorus compound to the polyolefin is from 1:10 to 1:100, whereby the first polyolefin resin can be made to have a specific phosphorus atom content. The phosphorus compound can be a phosphate ester, a phosphorus compound having a specific functional group, or a phosphorus oxide having a 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide (DOPO) functional group, but the present invention is not limited thereto.

[0037] In an example of the embodiment, the phosphorus compound can be a phosphate ester having a vinyl group, a phosphate ester having a biphenyl group, or a combination thereof. In an example of another embodiment, the phosphorus compound simultaneously has a biphenyl group and a hydroxy group. In an example of still another embodiment, the phosphorus compound can be 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB), or a combination thereof.

[0038] The polyolefin can be polyethylene, polypropylene, polybutene, or a combination thereof, or a polyolefin having an epoxy group at the terminal. More preferably, the polyolefin is polyethylene, polypropylene, or polybutene having an epoxy group at the terminal, but the present invention is not limited thereto.

[0039] The peroxide can be dicumyl peroxide (DCP), di-tert-butyl peroxide (DTBP), isopropylcumyl hydroperoxide (DBHP), or a combination thereof.

[0040] Taking the total weight of the resin composition as 100 wt%, the content of the first polyolefin resin is from 12 wt% to 55 wt%. For example, the content of the first polyolefin resin can be 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, or 50 wt%.

[0041] [Second Polyolefin Resin] The second polyolefin resin includes an ethylene polymer and a propylene polymer. Supplementally, since the ethylene polymer and the propylene polymer do not have a functional group containing phosphorus, the second polyolefin resin does not contain a phosphorus atom.

[0042] By adjusting the contents of the ethylene polymer and the propylene polymer, the texture of the flame-retardant adhesive film can be adjusted. In an example of the embodiment, the content of the ethylene polymer is greater than the content of the propylene polymer. Specifically, the weight ratio of the ethylene polymer to the propylene polymer is from 1.1 to 9, and more preferably, the weight ratio of the ethylene polymer to the propylene polymer is from 1.5 to 8.5.

[0043] Furthermore, by further adjusting the molecular weights of the ethylene polymer and the propylene polymer, the hardness and processing temperature of the flame-retardant adhesive film can be adjusted. In a more preferred embodiment, the ethylene polymer is linear low-density polyethylene (weight average molecular weight from 100,000 grams / mol to 300,000 grams / mol), and the propylene polymer is a propylene homopolymer (weight average molecular weight from 200,000 grams / mol to 300,000 grams / mol), but the present invention is not limited thereto.

[0044] Taking the total weight of the resin composition as 100 wt%, the content of the second polyolefin resin is from 20 wt% to 60 wt%. For example, the content of the second polyolefin resin can be 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%.

[0045] [Phosphorus compound having a spiro structure] By adding a phosphorus compound having a spiro structure, the flame-retardant property of the flame-retardant adhesive film is improved. Compared with triphenyl phosphate, the phosphorus compound having a spiro structure has a higher phosphorus atom content in structure, so a better flame-retardant effect can be achieved.

[0046] In an example of the embodiment, the phosphorus atom content of the phosphorus compound having a spiro structure is from 7 wt% to 15 wt%.

[0047] In an example of the embodiment, the phosphorus compound has a spiro structure. More preferably, the phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl)pentaerythritol diphosphate, but the present invention is not limited thereto.

[0048] In an example of the embodiment, the melting point of the phosphorus compound having a spiro structure is from 225°C to 246°C.

[0049] Taking the total weight of the resin composition as 100 wt%, the content of the phosphorus compound having a spiro structure is from 3 wt% to 15 wt%. For example, the content of the phosphorus compound having a spiro structure can be 4 wt%, 6 wt%, 8 wt%, 10 wt%, 12 wt%, or 14 wt%.

[0050] [Flame Retardant Compound] The flame retardant compound contains a phosphorus-based flame retardant. The flame retardant compound further contains at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant. By adding multiple types of flame retardants, it is possible to achieve a more excellent flame retardant effect through multiple flame retardant mechanisms, which cannot be achieved when adding a single flame retardant. Among them, the contribution of the phosphorus-based flame retardant is large.

[0051] In an example of the embodiment, taking the total weight of the flame retardant compound as 100 wt%, the addition amount of the phosphorus-based flame retardant is from 20 wt% to 45 wt%. For example, the addition amount of the phosphorus-based flame retardant can be 25 wt%, 30 wt%, 35 wt%, or 40 wt%.

[0052] Phosphorus-based flame retardants can be formed from phosphorus compounds. In order to further improve the flame retardant properties of phosphorus-based flame retardants, the phosphorus-based flame retardants include a core layer and a surface layer that wraps the core layer. Specifically, the core layer is formed from polymetaphosphoric acid, and the surface layer is a carbon layer, but the present invention is not limited thereto.

[0053] In an example of the embodiment, in the manufacturing method of the phosphorus-based flame retardant of the present invention, first, a phosphorus compound is heated to form polymetaphosphoric acid, and then, the polymetaphosphoric acid and a resin are reacted and dehydrated to form a carbon layer on the surface. Therefore, the core layer of the phosphorus-based flame retardant is formed from polymetaphosphoric acid, and the surface layer is a carbon layer.

[0054] The carbon layer on the surface layer of the phosphorus-based flame retardant is incombustible, so it can block oxygen and obtain the effect of preventing combustion from occurring. Furthermore, since the thermal conductivity of the carbon layer itself is low, it can effectively reduce the heat transfer from the flame to the base material, and can reduce the loss rate of the base material and the generation amount of combustibles.

[0055] When heated, nitrogen-based flame retardants generate carbon dioxide, nitrogen, ammonia, and water vapor, and dilute the oxygen concentration in the air. Furthermore, the gas can take away some heat during the convection process, and as a result, slow down the progress of combustion. For example, the nitrogen-based flame retardant is melamine or its derivatives, but the present invention is not limited thereto.

[0056] After combustion, silicon-based flame retardants carbonize to form a carbon layer. This carbon layer is incombustible, and further blocks oxygen and prevents combustion. And because the thermal conductivity of the carbon layer itself is low, it can effectively reduce the heat transfer from the flame to the base material. For example, the silicon-based flame retardant is silicon dioxide, silane, or a combination thereof, but the present invention is not limited thereto.

[0057] The flame retardant mechanism of boron-based flame retardants is similar to that of silicon-based flame retardants. After combustion, they carbonize and form a carbon layer. This carbon layer is incombustible and can further block oxygen to prevent combustion. And because the thermal conductivity of the carbon layer itself is low, the flame can effectively reduce the heat transfer to the base material. For example, boron-based flame retardants are borates or their combinations, but the present invention is not limited thereto.

[0058] Metal inorganic flame retardants contain crystal water and can release water vapor at high temperatures, which helps to dilute the oxygen concentration in the air and slow down the progress of combustion. For example, metal inorganic flame retardants are magnesium oxide, aluminum oxide, calcium carbonate, or their combinations, but the present invention is not limited thereto.

[0059] Due to the synergistic effect of phosphorus-based flame retardants, nitrogen-based flame retardants, silicon-based flame retardants, boron-based flame retardants, and metal inorganic flame retardants, the flame retardant effect of the flame retardant adhesive film can be further improved.

[0060] Taking the total weight of the resin composition as 100 wt%, the content of the flame retardant composite is from 15 wt% to 30 wt%. For example, the content of the first polyolefin resin can be 17.5 wt%, 20 wt%, 22.5 wt%, 25 wt%, or 27.5 wt%.

[0061] Furthermore, taking the total weight of the resin composition as 100 wt%, the content of the phosphorus-based flame retardant is from 3 wt% to 13 wt%. For example: 4 wt%, 6 wt%, 8 wt%, 10 wt%, or 12 wt%. The content of the nitrogen-based flame retardant is from 3 wt% to 7 wt%. For example: 4 wt%, 5 wt%, or 6 wt%. The content of the silicon-based flame retardant is from 1 wt% to 5 wt%. For example: 2 wt%, 3 wt%, or 4 wt%. The content of the boron-based flame retardant is from 1 wt% to 5 wt%. For example: 2 wt%, 3 wt%, or 4 wt%. The content of the metal inorganic flame retardant is from 1 wt% to 5 wt%. For example: 2 wt%, 3 wt%, or 4 wt%, but the present invention is not limited thereto.

[0062] [Experimental data] To prove that the flame-retardant adhesive film of the present invention has a flame-retardant effect, a resin composition was formulated with the above-mentioned components, and the resin composition was fed into a coating machine to produce the flame-retardant adhesive films of Experimental Examples 1 to 5 at a processing temperature of 170°C to 250°C.

[0063] In Experimental Examples 1 to 5, the specific addition amounts of the first polyolefin resin, the second polyolefin resin, the phosphorus compound having a spiro structure, and the flame retardant composite are listed in Table 1. Here, the first polyolefin resin is synthesized from a phosphorus compound (phosphoric acid ester having a vinyl group), a polyolefin (melt index measured based on ASTM D1238 standard is 1.5 g / 10 min to 3.0 g / 10 min), and a peroxide at a temperature of 160°C to 240°C (the screw temperature is controlled at 170°C, 180°C, 210°C, 180°C, 170°C, 160°C in sequence), and the weight ratio of the phosphorus compound to the polyolefin is 1:10 to 1:100. The second polyolefin resin includes a propylene homopolymer (number average molecular weight is 200,000 g / mol to 300,000 g / mol) and a linear low-density polyethylene (number average molecular weight is 100,000 g / mol to 300,000 g / mol). The phosphorus compound having a spiro structure is bis(2,4-dichlorophenyl)pentaerythritol diphosphate. The phosphorus-based flame retardant is a mixture of a phosphoric acid monoester and a phosphoric acid diester having high activity characteristics, and the weight ratio of the phosphoric acid monoester to the phosphoric acid diester is 1:2 to 1:5. The nitrogen-based flame retardant is melamine. The silicon-based flame retardant is silicon dioxide with a particle size of 10 μm to 50 μm. The boron-based flame retardant is borate. The metal inorganic flame retardant is aluminum oxide.

[0064] Then, the flame-retardant adhesive films of Experimental Examples 1 to 5 were subjected to an experiment on the flame-retardant effect according to the standard experimental method of UL94VTM, and the experimental results are described in Table 2.

[0065] According to the standard test method of UL94VTM, the flame retardant grade "VTM-0" means that the self-ignition time of each sample is 10 seconds or less. The total of the self-ignition times of 5 samples is 50 seconds or less. When contacting the flame for the second time, the total of the self-ignition time and afterglow time of each sample is 30 seconds or less. The self-ignition or afterglow of the sample does not spread to the clamp, and the hanging sample does not ignite the cotton.

[0066] The flame retardant grade "VTM-1" means that the self-ignition time of each sample is 30 seconds or less. The total of the self-ignition times of 5 samples is 250 seconds or less. When contacting the flame for the second time, the total of the self-ignition time and afterglow time of each sample is 60 seconds or less. The self-ignition or afterglow of the sample does not spread to the clamp, and the hanging sample does not ignite the cotton.

[0067] The flame retardant grade "VTM-2" means that the self-ignition time of each sample is 30 seconds or less. The total of the self-ignition times of 5 samples is 250 seconds or less. When contacting the flame for the second time, the total of the self-ignition time and afterglow time of each sample is 60 seconds or less. The self-ignition or afterglow of the sample spreads to the clamp, and the hanging sample ignites the cotton.

[0068] Table 1 TIFF2025104184000002.tif119144

[0069] Table 2 TIFF2025104184000003.tif104145

[0070] From the results of Table 1 and Table 2, it can be seen that by adding the first polyolefin resin, the second polyolefin resin, the phosphorus compound having a spiro structure, and the flame retardant compound and controlling the addition amount of each component, the flame retardant effect of the flame retardant adhesive film can be improved. Therefore, the flame retardant adhesive film of the present invention can replace the halogen-containing flame retardant adhesive film currently on the market.

[0071] In the resin composition, when the content of the first polyolefin resin is from 20 wt% to 50 wt%, the flame-retardant adhesive film has a good flame-retardant effect. Furthermore, the content of the first polyolefin resin can be adjusted according to the requirements of flame retardancy.

[0072] The flame-retardant adhesive film 1 of the present invention has extremely low toxicity, is safe, and has high flame retardancy, so it can be applied as a decorative film material that can be used for interior decoration materials, vehicle interiors, etc.

[0073] As shown in FIG. 2, the decorative film material includes the aforementioned flame-retardant adhesive film 1 and a pattern layer 2. The pattern layer 2 is installed on the flame-retardant adhesive film 1. By installing the pattern layer 2, the decorative film material can maintain an aesthetic effect. Since the decorative film material uses the flame-retardant adhesive film 1, the decorative film material including the flame-retardant adhesive film 1 also has extremely low toxicity, is safe, and has high flame retardancy. [Beneficial effects according to the embodiment]

[0074] One beneficial effect of the present invention is that the flame-retardant adhesive film and the decorative film material provided by the present invention improve the flame retardancy of the flame-retardant adhesive film through the technical solutions of "the resin composition includes a first polyolefin resin, a second polyolefin resin, a phosphorus compound having a spiro structure, and a flame retardant compound" and "the content of phosphorus atoms in the first polyolefin resin is from 0.1 wt% to 1.0 wt%".

[0075] The content disclosed above is only a preferred and feasible embodiment of the present invention, and does not limit the scope of the claims of the present invention. Therefore, equivalent technical modifications made based on the content of the specification and the accompanying drawings of the present invention shall all be included in the scope of the claims of the present invention.

Explanation of reference numerals

[0076] 1 Flame-retardant adhesive film 2 Decorative film material

Claims

1. A flame-retardant adhesive film formed of a halogen-free resin composition, wherein the resin composition comprises: 12 wt% to 55 wt% of a first polyolefin resin having a phosphorus atom content of 0.1 wt% to 1.0 wt%, 20 wt% to 60 wt% of a second polyolefin resin containing an ethylene polymer and a propylene polymer, 3 wt% to 15 wt% of a phosphorus compound having a spiro structure, 15 wt% to 30 wt% of a flame retardant compound, and the flame retardant compound contains a phosphorus-based flame retardant, and the flame retardant compound further contains at least one selected from the group consisting of a nitrogen-based flame retardant, a silicon-based flame retardant, a boron-based flame retardant, and a metal inorganic flame retardant, characterized in that it is a flame-retardant adhesive film.

2. The flame-retardant adhesive film according to Claim 1, wherein the first polyolefin resin is obtained by the reaction of a phosphorus compound and a polyolefin, and the weight ratio of the phosphorus compound to the polyolefin is 1:10 to 1:

100.

3. The flame-retardant adhesive film according to Claim 2, wherein the phosphorus compound is selected from the group consisting of a phosphate ester having a vinyl group and a phosphate ester having a biphenyl group.

4. The flame-retardant adhesive film according to Claim 2, wherein the phosphorus compound is a phosphorus compound having a biphenyl group and a hydroxy group.

5. The flame-retardant adhesive film according to Claim 2, wherein the phosphorus compound is selected from the group consisting of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide.

6. The flame-retardant adhesive film according to Claim 2, wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and polybutene.

7. The flame-retardant adhesive film according to Claim 2, wherein the terminal of the polyolefin has an epoxy group.

8. The flame-retardant adhesive film according to Claim 1, wherein the first polyolefin resin has a functional group, and the functional group is selected from the group consisting of an ethylene group and a biphenyl group.

9. The flame-retardant adhesive film according to Claim 1, wherein the phosphorus atom content of the phosphorus compound having a spiro structure is 7 wt% to 15 wt%.

10. The flame-retardant adhesive film according to claim 1, wherein the phosphorus compound having the spiro structure is bis(2,4-dichlorophenyl)pentaerythritol diphosphate.

11. The flame-retardant adhesive film according to claim 1, wherein the phosphorus-based flame retardant includes a core layer and a surface layer covering the core layer, and the surface layer is a carbon layer.

12. The flame-retardant adhesive film according to claim 11, wherein the core layer is formed by polyphosphonic acid.

13. The flame-retardant adhesive film according to claim 1, wherein the nitrogen-based flame retardant is melamine or a derivative thereof.

14. The flame-retardant adhesive film according to claim 1, wherein the silicon-based flame retardant is silicon dioxide or silane.

15. The flame-retardant adhesive film according to claim 1, wherein the boron-based flame retardant is borates.

16. The flame-retardant adhesive film according to claim 1, wherein the metal inorganic flame retardant is selected from the group consisting of magnesium oxide, aluminum oxide, and calcium carbonate.

17. The density of the flame-retardant adhesive film is 0.9 g / cm 3 to 1.3 g / cm 3 The flame-retardant adhesive film according to claim 1, wherein the density is as described above.

18. The flame-retardant adhesive film according to claim 1, wherein the content of phosphorus atoms in the entire flame-retardant adhesive film is 1.25 wt% to 2.0 wt%.

19. A decorative film material, comprising: the flame-retardant adhesive film according to any one of claims 1 to 18; and a pattern layer provided on the flame-retardant adhesive film.

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