JPH1171484A - Flame retardant resin composition and flame retardant wall covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame retardant resin composition having high resistance to NOx and suitable as a material for various products. SOLUTION: The flame retardant composition comprises an olefin-based resin mainly composed of an ethylene-α-olefin copolymer having a density of not greater than 0.89 g/cm<3> and a melt index of 0.5-10 g/10 min, a surface treated magnesium hydroxide and an antioxidant containing a phosphorus-based antioxidant. It is preferred that the ethylene-α-olefin copolymer is obtained by using geometrically restraint catalyst containing a metallocene compound; that the surface treatment has been conducted by using at least one member selected from among a higher fatty acid, a metal salt of a higher fatty acid, a phosphoric acid ester, an anionic surfactant, a silane coupling agent, a titanate coupling agent and an aluminate coupling agent; and that 0.01-2 pts.wt. antioxidant are incorporated into 100 pts.wt. composition comprising 20-80 wt.% olefin- based resin and 80-20 wt.% magnesium hydroxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant resin composition and a flame-retardant wall covering material, and more particularly to, in particular, NO _x resistance.
The present invention relates to an olefin-based flame-retardant resin composition and a flame-retardant wall covering material having excellent heat resistance.

[0002]

2. Description of the Related Art It is known to blend a metal hydrate such as magnesium hydroxide for the purpose of imparting flame retardancy to an ethylene / α-olefin copolymer, and various proposals have been made. JP-A-61-254647, JP-A-61-254647
255950, etc.). However, a molded article of a resin composition in which an untreated surface of magnesium hydroxide is blended with an ethylene / α-olefin copolymer is easily colored, and NO _x
There is a problem that discoloration under a gas atmosphere is remarkable.
On the other hand, to the ethylene / α-olefin copolymer, using a higher fatty acid, a metal salt of a higher fatty acid, a silane coupling agent or the like from the viewpoint of improving the compatibility with the ethylene / α-olefin copolymer and dispersibility. In the molded article of the resin composition containing the surface-treated magnesium hydroxide, the coloring or discoloration at the initial stage does not matter, but NO _x
If left in a gas atmosphere or under a fluorescent lamp, coloring or discoloration occurs, and long-term storage becomes a problem.

[0003] In Japanese Patent Application Laid-Open No. 7-90134,
In order to solve the problem of coloring or discoloration, ethylene α
It describes that an olefin copolymer is used in combination with a surface-treated magnesium hydroxide and a metal salt of a fatty acid. However, even in this case, coloring or discoloration in a NO _x gas atmosphere cannot be prevented. In a system containing the magnesium hydroxide, and phenol-based antioxidant added to said system, and a NO _x gas and ultraviolet rays mutually act compositely, the phenolic antioxidant is changed into quinone compounds It is considered that coloring or discoloration is caused by the above, but an effective technique capable of effectively preventing the coloring or discoloring has not yet been provided.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and achieve the following objects. That is, the present invention provides roll workability, NO _x resistance,
Balance of shrinkage resistance and flame retardancy is good, and to provide a particular flame retardant resin composition excellent in resistance to NO _x resistance and flame retardancy wall coverings.

[0005]

Means for Solving the Problems As a result of intensive studies, the inventors of the present invention have found that the coloring or discoloration is greatly affected by the type of magnesium hydroxide, the type of antioxidant, etc. It has been found that the problem of coloring or discoloration can be solved only by using the obtained magnesium hydroxide in combination with a specific antioxidant including a phosphorus-based antioxidant.

[0006] The present invention is based on the above findings, and means for solving the above problems are as follows. That is, <1> an olefin resin having a density of 0.89 g / cm ³ or less and a melt index of 0.5 to 10 g / 10 min and containing an ethylene / α-olefin copolymer as a main component; A flame-retardant resin composition comprising a treated magnesium hydroxide and an antioxidant containing a phosphorus-based antioxidant. <2> The flame-retardant resin composition according to <1>, wherein the ethylene / α-olefin copolymer is obtained using a geometrically constrained catalyst containing a metallocene compound. <3> The flame-retardant resin composition according to <1> or <2>, wherein the content of the ethylene / α-olefin copolymer in the olefin-based resin is 80 to 100% by weight. <4> The surface treatment of magnesium hydroxide is at least one selected from higher fatty acids, metal salts of higher fatty acids, phosphate esters, anionic surfactants, silane coupling agents, titanate coupling agents, and aluminate coupling agents. <1> to <
3> The flame-retardant resin composition according to any one of the above. <5> The magnesium hydroxide has a BET specific surface area of 1 to 15 m ² / g and an average secondary particle size of 0.1 to 0.5 m ² / g.
The flame-retardant resin composition according to any one of <1> to <4>, which has a thickness of 3 to 4.0 μm. <6> An antioxidant containing a phosphorus-based antioxidant is added in an amount of 0.01 to 100 parts by weight based on 100 parts by weight of a composition containing 20 to 80% by weight of an olefin-based resin and 80 to 20% by weight of surface-treated magnesium hydroxide. The flame-retardant resin composition according to any one of <1> to <5>, containing 2 parts by weight. <7> The antioxidant containing a phosphorus-based antioxidant according to any one of <1> to <6>, wherein the phenol-based antioxidant is contained in an amount of 100 parts by weight or less based on 100 parts by weight of the phosphorus-based antioxidant. Is a flame-retardant resin composition. <8> The flame-retardant resin composition according to <7>, wherein the phosphorus antioxidant has a molecular weight of 500 or more, the phenolic antioxidant is a polyhydric phenol, and the molecular weight is 1,000 or more. It is. <9> A flame-retardant wall covering formed by molding the flame-retardant resin composition according to any one of <1> to <8>.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

(Flame-retardant resin composition) The flame-retardant resin composition of the present invention contains an olefin resin, magnesium hydroxide, and an antioxidant containing a phosphorus-based antioxidant. And other components.

-Olefin Resin- The olefin resin contains a specific ethylene / α-olefin copolymer as a main component, and further contains other olefin resins as required. The other olefin-based resin is not particularly limited and may be appropriately selected depending on the purpose.
It may be a commercial product.

The content of the ethylene / α-olefin copolymer in the olefin resin is 80%.
-100% by weight is preferred, 90-100% by weight is more preferred, and 100% by weight is particularly preferred. Further, in the present invention, as the content, the lower limit or the upper limit of any of the numerical ranges or the value of any of the contents adopted in the examples described below as a lower limit, any of the numerical ranges It is also preferable to use a lower limit or upper limit of the above or a numerical range having the upper limit of any one of the contents adopted in Examples described later.

[0010] If the content is less than 80% by weight, the shrinkage of the molded article becomes large, and the texture may become hard, which is not preferable.

[0011] The density of the ethylene · alpha-olefin copolymer, are required to be at 0.89 g / cm ³ or less, preferably 0.85~0.89g / cm ^3,
0.86 to 0.88 g / cm ³ is particularly preferred. Also,
In the present invention, as the density, a lower limit or an upper limit of any of the numerical ranges or a value of any of the densities adopted in Examples described later as a lower limit, or a lower limit of any of the numerical ranges or A numerical range in which the upper limit value or any of the density values adopted in the examples described later is the upper limit is also preferable.

If the density exceeds 0.89 g / cm ³ , the feel of the molded article may not be sufficient, and the molded article may shrink, which is not preferable. On the other hand, it is preferable that the density be 0.89 g / cm ³ or less and within the above-mentioned preferable range, since the above-mentioned drawbacks can be avoided and processing can be performed in a wide temperature range.

The ethylene / α-olefin copolymer must have a melt index (hereinafter sometimes abbreviated as “MI”) of 0.5 to 10 g / 10 min. ~ 7.0 g / 10 min is preferred,
2.0 to 5.0 g / 10 min is particularly preferred. Further, in the present invention, as the melt index, any lower limit or upper limit of the numerical range or the value of any of the melt indexes adopted in the examples described below as a lower limit, any one of the numerical range The numerical range in which the upper limit is the lower limit or the upper limit of the above or any one of the values of the melt index adopted in Examples described later is also preferable.

The melt index is 0.5 g / 10
If it is less than 10 minutes, the processability is deteriorated, and the appearance of the molded product is deteriorated. Therefore, it is necessary to process at a high temperature, and the production of the molded product becomes difficult. The strength of the product may be reduced, and the processability, particularly the tackiness and neck-in, may increase. On the other hand, it is preferable that the melt index is within the above-mentioned preferred range, since the above-mentioned drawbacks can be eliminated and workability can be improved.

The maximum melting peak temperature by DSC of the ethylene / α-olefin copolymer: Tm (° C.) is preferably from 60 to 100 ° C., and more preferably from 60 to 80 ° C. Further, in the present invention, as the maximum melting peak temperature by the DSC, any lower limit or upper limit of the numerical range or any of the values of the highest melting peak temperature adopted in the examples described below, the lower limit, It is also preferable to use a lower limit or upper limit of any of the above numerical ranges or a numerical range having an upper limit of any one of the maximum melting peak temperatures adopted in Examples described later.

The maximum melting peak temperature by DSC is 1
If the temperature exceeds 00 ° C., processing becomes difficult. Meanwhile, the DS
When the maximum melting peak temperature by C is within the above-mentioned numerical range, the above-mentioned drawbacks can be eliminated, and processing can be performed at a low temperature, which is preferable in terms of energy saving.

As the ethylene / α-olefin copolymer, an appropriately synthesized product or a commercially available product may be used. These may be used alone or in combination of two or more. The ethylene / α-
The olefin copolymer is, for example, a solution weight using a geometrically constrained catalyst containing a metallocene compound, more specifically, a geometrically constrained catalyst (CGC catalyst) which is a kind of a single site catalyst (SSC catalyst) centered on a metallocene compound. It is preferably obtained by a legal method. When the geometrically constrained catalyst is used, the molecular chain structure is not disturbed even if the amount of the comonomer is large as compared with the case where a conventional Ziegler catalyst or the like is used, and a large amount of the comonomer can be uniformly introduced, In addition, since the molecular weight distribution can be set to a narrow range, as a result, the dependence of the shear rate on the melt viscosity is large,
This is advantageous in that a copolymer having high melt tension and excellent moldability can be obtained.

Commercially available ethylene / α-olefin copolymers include, for example, “Engage (registered trademark)” manufactured by DuPont Dow Elastomer Co., Ltd.
An ethylene-octene-1 copolymer such as "Affinity (registered trademark)" manufactured by Chemical Japan Co., Ltd., and "Taphma-H (registered trademark)" manufactured by Mitsui Petrochemical Industries, Ltd. is preferably exemplified.

The content of the ethylene / α-olefin copolymer in the flame retardant resin composition is from 20 to 80.
% By weight, more preferably 30 to 70% by weight,
40-60% by weight is particularly preferred. Further, in the present invention, as the content, the lower limit or the upper limit of any of the numerical ranges or the value of any of the contents adopted in the examples described below as a lower limit, any of the numerical ranges It is also preferable to use a lower limit or upper limit of the above or a numerical range having the upper limit of any one of the contents adopted in Examples described later.

When the content is less than 20% by weight,
Moldability / mechanical strength may decrease, 80% by weight
If it exceeds, the flame retardancy may be insufficient.

-Magnesium hydroxide-The magnesium hydroxide needs to be surface-treated. In the present invention, as the surface-treated magnesium hydroxide, one obtained by appropriately treating the surface of untreated magnesium hydroxide or a commercially available product may be used. As the commercially available products, for example, “Kisma 5A”, “Kisma 5B”, “Kisma 5J”, “Kisma 5E”, etc., manufactured by Kyowa Chemical Industry Co., Ltd. are preferably exemplified.

The surface treatment is performed using a known surface treatment agent. Preferred examples of the surface treatment agent include higher fatty acids, metal salts of higher fatty acids, phosphate esters, anionic surfactants, silane coupling agents, titanate coupling agents, and aluminate coupling agents. These may be used alone,
Two or more kinds may be used in combination. In the present invention, among these, stearic acid, oleic acid, palmitic acid,
At least one selected from higher fatty acids such as erucic acid and behenic acid, and metal salts thereof such as sodium, potassium, magnesium, calcium and zinc, silane coupling agents, titanate coupling agents and aluminate coupling agents. The surface treatment used is particularly preferred. Magnesium hydroxide surface-treated with at least one of the surface treatment agents has good compatibility with the ethylene / α-olefin copolymer and has good dispersibility in the flame-retardant resin composition. Is preferred.

The amount of the surface treating agent used for performing the surface treatment on the magnesium hydroxide is preferably 0.1 to 6 parts by weight, more preferably 0.5 to 6 parts by weight, based on 100 parts by weight of the magnesium hydroxide. A part by weight is more preferable, and 1 to 6 parts by weight is particularly preferable. In general, as the amount of the surface treating agent increases, in the present invention, a favorable effect is more likely to be obtained. The time of the surface treatment is not particularly limited and can be appropriately selected depending on the purpose, but is preferably about 1 to 60 minutes. In general, in the present invention, a favorable effect is more likely to be obtained as the time of the surface treatment becomes longer.

In the flame-retardant resin composition of the present invention, if the surface-treated magnesium hydroxide has the following characteristics, a molded article obtained by molding the flame-retardant resin composition is obtained. This is advantageous for suitably maintaining mechanical strength and surface appearance. That is, the surface-treated magnesium hydroxide preferably has a BET specific surface area of 1 to 15 m ² / g, more preferably 4 to 12 m ² / g.
The surface-treated magnesium hydroxide preferably has an average secondary particle diameter of 0.3 to 4.0 μm, more preferably 0.5 to 1.5 μm. The average secondary particle diameter can be measured by, for example, a microtrack method.

The content of the surface-treated magnesium hydroxide in the flame-retardant resin composition of the present invention is 8
It is preferably 0 to 20% by weight, more preferably 70 to 30% by weight, and particularly preferably 60 to 40% by weight. Further, in the present invention, as the content, the lower limit or the upper limit of any of the numerical ranges or the value of any of the contents adopted in the examples described below as a lower limit, any of the numerical ranges It is also preferable to use a lower limit or upper limit of the above or a numerical range having the upper limit of any one of the contents adopted in Examples described later.

When the content is less than 20% by weight,
Flame retardancy may be insufficient, and if it exceeds 80% by weight, moldability may be poor and the mechanical strength and surface appearance of the molded product may be poor.

-Antioxidant containing phosphorus-based antioxidant- The antioxidant containing the phosphorus-based antioxidant contains a phosphorus-based antioxidant as an essential component, and further includes a phenol-based antioxidant, if necessary. including. It is preferable to use the phenolic antioxidant in combination with the phosphorus antioxidant in that the heat stability is improved due to the synergistic effect of the two.

The phenolic antioxidant is preferably a polyhydric phenol and has a molecular weight of preferably 500 or more, and more preferably 1000 or more, in that there is little coloring or discoloration in an NO _x gas atmosphere. Is more preferable. In the present invention, the phenolic antioxidant may be used alone or in combination of two or more. May be used. Commercially available phenolic antioxidants include, for example, "Irganox1010" manufactured by Ciba Specialty Chemicals Co., Ltd.
“Irganox 1330” and “Sumilyzer GA-80” manufactured by Sumitomo Chemical Co., Ltd. are preferably exemplified.

The phosphorus antioxidant has a molecular weight of 5
It is preferably at least 00, more preferably at least 1,000. In the present invention, the phosphorus-based antioxidants may be used alone or in combination of two or more. May be used. Commercial products of the phosphorus-based antioxidants include, for example, “Sand” manufactured by Sando Corporation.
Ostab P-EPQ "," Adeka Stub 3010 "and" Adeka Stub PEP-36 "manufactured by Asahi Denka Co., Ltd. are preferred.

The content of the antioxidant containing the phosphorus-based antioxidant in the flame retardant resin composition is 20 to 80% by weight of the olefin resin and 80 to 20% by weight of the surface-treated magnesium hydroxide. %, Preferably from 0.01 to 2 parts by weight, and
To 1 part by weight is more preferable, and 0.1 to 0.5 part by weight is particularly preferable. In the present invention, as the content, the lower limit or upper limit of any one of the numerical ranges or the value of any one of the contents adopted in the examples described below as the lower limit, and the lower limit of any of the numerical ranges A numerical range in which the upper limit value or the upper limit value or the value of any one of the contents adopted in Examples described later is also preferred. The content is 0.01
Is less than parts by weight the effect is less resistance to NO _x resistance, sometimes colored or discoloration occurs, and Bloom bleeding on the surface of the molded article exceeds 2 parts by weight, the commercial value is significantly lowered.

The antioxidant containing the phosphorus-based antioxidant contains 100 parts by weight or less (at most 100 parts by weight) of the phenolic antioxidant with respect to 100 parts by weight of the phosphorus-based antioxidant. (Including the case where the phenolic antioxidant is not contained at this time), more preferably 80 parts by weight or less (at most 80 parts by weight), and more preferably 50 parts by weight or less (at most 50 parts by weight). Part) is particularly preferred. In the present invention, as the content of the phenolic antioxidant with respect to 100 parts by weight of the phosphorus-based antioxidant, any one of the lower limit or the upper limit of the numerical range or any of the lower limit or upper limit employed in Examples described later. It is also preferable that the value of the content be the lower limit, and the lower limit or the upper limit of any of the above numerical ranges or the numerical range of the upper limit be any of the values of the content adopted in Examples described later. When the content of the phenolic antioxidant for said phosphorus antioxidant to 100 parts by weight exceeds 100 parts by weight, NO _x discoloration by gas is increased undesirably.

-Other components- Other components in the present invention are not particularly limited as long as the object of the present invention is not impaired, and can be appropriately selected depending on the use of the flame-retardant resin composition and the like. For example,
Known additives or auxiliary materials such as a neutralizer, a dispersant, a light stabilizer, a weather resistance improver, a filler, an antistatic agent, a pigment, a flame retardant, a foaming agent, and a processability improver are exemplified. These may be used alone or in combination of two or more. In addition, among these, a light stabilizer, a neutralizing agent, a pigment (particularly, titanium oxide) and the like may affect the NO _x resistance, and it is preferable to select them with sufficient consideration.

As the above-mentioned pigment, for example, phthalocyanine pigments, carbon black and the like are preferably exemplified in addition to titanium oxide. Suitable examples of the flame retardant include carbamate polyphosphate compounds, silicone compounds, and metal oxides. As the processability improver, for example, metal soap, mineral oil-based softener and the like are preferably exemplified. Examples of the foaming agent include azo compounds such as azodicarbonamide (ADCA) and azobisisobutylnitrile (AIBN); sulfonyl hydrazide compounds such as P, P′-oxybisbenzenesulfonylhydrazide (OBSH); dinitroso Chemical blowing agents such as nitroso compounds such as pentamethylenetetramine (DPT) are exemplified. Among them, azodicarbonamide (ADCA) is preferable in view of stability during processing.

The content of the other components in the flame-retardant resin composition of the present invention may be such that the effect of the present invention is not impaired, and is appropriately determined according to the use of the flame-retardant resin composition. can do.

The flame-retardant resin composition of the present invention can be obtained, for example, by mixing the above-mentioned components using a mixing device or kneading device known per se. The mixing device and the kneading device are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a Banbury mixer and an extruder. The conditions for the mixing or kneading are not particularly limited and can be appropriately determined according to the composition of the flame-retardant resin composition and the like. Generally, the time is about 1 to 20 minutes, About 100 to 250 ° C.

The flame-retardant resin composition of the present invention, for example, rolling, is suitable for extrusion or the like, because particularly excellent in resistance to NO _x resistance, extremely film, sheet, as a material for products such as wall coverings Useful.

The flame-retardant resin composition of the present invention can be molded using, for example, the following known molding apparatus. Examples of the molding device include a calender molding machine, an extrusion molding machine, and a hot press molding machine.
The conditions for molding the flame-retardant resin composition of the present invention are not particularly limited, and can be appropriately selected depending on the composition, the molding method, and the like.
The temperature is about 00 to 200 ° C., and the time is 1 to 10
Minutes.

Various products obtained by using the flame-retardant resin composition of the present invention can be appropriately subjected to primer treatment, printing such as gravure printing, and / or pressing, etc. on the surface.

(Flame-retardant wall covering material) The flame-retardant wall covering material of the present invention is obtained by molding the above-mentioned flame-retardant resin composition of the present invention. The molding can be performed using the above-described molding apparatus, and the above-mentioned molding conditions can be suitably adopted. After the molding, a primer treatment, printing such as gravure printing, and / or squeezing may be appropriately performed. Further, the flame-retardant wall covering of the present invention is obtained by laminating a sheet obtained by molding the above-mentioned flame-retardant resin composition of the present invention on a suitably selected known flame-retardant base material (for example, aluminum hydroxide paper or the like). It may be a flame-retardant wall covering.

[0040]

Hereinafter, embodiments of the present invention will be described.
The present invention is not limited by these examples.

(Examples 1 to 16 and Comparative Examples 1 to 3) Table 1
The components shown in Table 1 were blended in the proportions shown in Table 1, kneaded at 160 ° C. for 10 minutes using a Banbury mixer, and pelletized to obtain pellets of the flame-retardant resin composition. The pellets of the composition were kneaded at a roll temperature of 120 ° C. for 5 minutes, and then calendered (rolled) to obtain a sheet having a thickness of 0.15 mm. This sheet was laminated on aluminum hydroxide paper to form a flame-retardant wall covering.

Each of the obtained flame-retardant wall covering materials was evaluated for roll workability, resistance to NO ₂ , shrinkage, and flame retardancy, and the results are shown in Table 1.

<Evaluation> -Roll processability- Each of the above-mentioned flame-retardant resin compositions was kneaded using a 6-inch test roll, and each sheet was easily taken out from the test roll (adhesiveness) and its surface was evaluated. The appearance (smoothness) was visually evaluated according to the following criteria. In addition, there is no practical problem as long as it is not less than Δ. (Tackiness) ・ ・ ・: Easy to take out without sticking. ○: A little sticky, but easy to remove. Δ: Slightly adhered, but no problem in taking out. X: sticky and not removable. (Smoothness) ・ ・ ・: Extremely excellent in smoothness.・ ・ ・: Smoothness is good. Δ: The degree of smoothness is slightly inferior, but there is no problem in appearance. X: Extremely bad, with practical problems.

[0044] - resistance to NO ₂ resistance - to set the test piece of each flame-retardant wall covering (40 × 70 mm) in a desiccator having an internal volume of 6000 cm ^3. Further, in this desiccator, a sulfuric acid was reacted with an aqueous solution of sodium nitrite to generate a NO ₂ gas having a concentration of about 400 ppm. After being left at 20 ° C. for 20 hours in this state, the test piece was taken out of the desiccator and evaluated for discoloration. The evaluation was performed by using a color computer SM-4 manufactured by Suga Test Instruments Co., Ltd. for a test piece before being put in a desiccator and a test piece left in a NO ₂ gas atmosphere and taken out of the desiccator. , Yellow index (YI).

-Shrinkability (Curl)-Each sheet prepared by a test roll and aluminum hydroxide paper coated with an adhesive are heat-sealed to form a laminate, and the laminate is left at room temperature to shrink. (Curl) was visually evaluated. The evaluation criteria are as follows, and there is no problem as long as it is not less than Δ. ○: hardly curls. Δ: slightly curled, but no problem in practical use. ×: Undesirably large curl.

-Flame retardancy-The calorific value (Tdθ) and the amount of smoke (CA) are determined according to JIS A
The measurement was performed in accordance with the flame retardancy test method of 1321 building interior materials and construction methods. Note that “Tdθ” means a temperature time area (° C. minute), and “CA” means a smoke generation coefficient.

[0047]

[Table 1]

In Table 1, for magnesium hydroxide, “A” is BET specific surface area = 5.5 m ² / g, average secondary particle diameter = 0.9 μm, and “B” is BET specific surface area = 4 0.9 m ² / g, average secondary particle size = 1.0 μm
And the surface treatment with 3 parts by weight of a surface treating agent (stearic acid) based on 100 parts by weight thereof, and "C"
Is BET specific surface area = 10 m ² / g, average secondary particle diameter =
0.6 μm, 100 parts by weight of which are surface-treated with 3 parts by weight of a surface treating agent (oleic acid), and “D” is BET specific surface area = 9.1 m ² / g, average secondary Particle size = 0.6 μm. "D" stands for
The amount of the surface treatment agent is 1.5 times that of “C”. “E” is BET specific surface area = 20 m ² /
g, average secondary particle diameter = 0.3 μm, and surface-treated with 3 parts by weight of a surface treating agent (stearic acid) with respect to 100 parts by weight.

Regarding the antioxidant, a phenolic antioxidant is “Sumilyzer BHT” manufactured by Sumitomo Chemical Co., Ltd.
(Molecular weight = 220), “Irganox 1076” manufactured by Ciba Specialty Chemicals (Molecular weight = 5)
31), “Irganox 1010” (polyhydric phenol, molecular weight = 1178), and the phosphorus antioxidant is
"Sandstab P-EPQ" (Molecular weight = 1035) manufactured by Sando Co., Ltd., "ADK STAB 3" manufactured by Asahi Denka Co., Ltd.
010 "(molecular weight = 503).

The olefin resin used here was a single-site catalyst (SS) mainly composed of a metallocene compound.
Ethylene-octene-1 produced by a solution polymerization method using a geometrically constrained catalyst (CGC catalyst), which is a type of C catalyst).
Copolymer (MI = 5.0 g / 10 min, density = 0.87 g)
/ Cm ³ ) and ethylene-octene-1 copolymer (MI
= 18 g / 10 min, density = 0.88 g / cm ³ ), an ethylene-propylene copolymer (M
I = 4.5 g / 10 min, density = 0.87 g / cm ³ ),
And an ethylene / methyl methacrylate copolymer (M
I = 3.5 g / 10 min, density = 0.94 g / cm ³ ).

The following are clear from the results in Table 1. That is, in Comparative Example 1 in which magnesium hydroxide was not used, roll workability and flame retardancy were insufficient. In Comparative Example 2 using untreated magnesium hydroxide, the roll processability and the NO ₂ resistance were extremely poor. In Comparative Example 3 in which the melt index of the olefin-based resin containing an ethylene / α-olefin copolymer as a main component is out of the range of 0.5 to 10 g / 10 minutes, the roll processability (adhesion) is insufficient. It is. On the other hand, Examples 1 to 16 using an olefin resin mainly containing a specific ethylene / α-olefin copolymer, a surface-treated magnesium hydroxide, and an antioxidant containing a phosphorus antioxidant were used. Does not have the above-mentioned problems, it is clear that the roll processability, the NO ₂ resistance, the shrinkage and the flame retardancy are well balanced, and the NO ₂ resistance and the flame retardancy are particularly excellent. .

[0052]

According to the present invention, the above-mentioned conventional problems can be solved. In addition, roll workability, NO resistance
₂ resistance, good balance of shrinkage and flame retardancy, especially resistance to N
It is possible to provide a flame-retardant resin composition and a flame-retardant wall covering material having excellent O _x properties.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 5:49 5:13) (72) Inventor Misato Haga 1-12-19 Nishikicho, Warabi-shi, Saitama Dainippon Ink and Chemicals, Inc. In-house (72) Inventor Takeshi Imahashi 4285 Hayashida-cho, Sakaide-shi, Kagawa Inside Kyowa Chemical Industry Co., Ltd.

Claims (9)

[Claims] (1) a density of 0.89 g / cm ³ or less;
And an antioxidant containing an olefin resin having a melt index of 0.5 to 10 g / 10 min and containing an ethylene / α-olefin copolymer as a main component, a surface-treated magnesium hydroxide, and a phosphorus-based antioxidant. And a flame-retardant resin composition. 2. The flame-retardant resin composition according to claim 1, wherein the ethylene / α-olefin copolymer is obtained using a geometrically constrained catalyst containing a metallocene compound. 3. An ethylene / α in an olefin resin.
The flame-retardant resin composition according to claim 1, wherein the content of the olefin copolymer is 80 to 100% by weight. 4. The surface treatment of magnesium hydroxide is selected from higher fatty acids, metal salts of higher fatty acids, phosphate esters, anionic surfactants, silane coupling agents, titanate coupling agents and aluminate coupling agents. The flame-retardant resin composition according to any one of claims 1 to 3, which is performed using at least one kind. 5. BET ratio in magnesium hydroxide
Surface area is 1 to 15m ^Two/ G and average secondary particle size
Is 0.3 to 4.0 μm.
3. The flame-retardant resin composition according to item 1. 6. An antioxidant containing a phosphorus-based antioxidant in an amount of 0.1 to 100 parts by weight of a composition containing 20 to 80% by weight of an olefin-based resin and 80 to 20% by weight of a surface-treated magnesium hydroxide. 2. The composition according to claim 1, wherein the content is from 01 to 2 parts by weight.
6. The flame-retardant resin composition according to any one of items 1 to 5. 7. An antioxidant containing a phosphorus antioxidant,
The flame-retardant resin composition according to any one of claims 1 to 6, further comprising 100 parts by weight or less of a phenolic antioxidant based on 100 parts by weight of the phosphorus-based antioxidant. 8. The flame-retardant resin composition according to claim 7, wherein the phosphorus antioxidant has a molecular weight of 500 or more, the phenolic antioxidant is a polyhydric phenol, and has a molecular weight of 1000 or more. Stuff. 9. A flame-retardant wall covering formed by molding the flame-retardant resin composition according to claim 1. Description: