JPH031350B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a flame-retardant resin composition with improved moldability and mechanical strength, an improving agent used to provide the composition, and a method for producing the improving agent. More specifically, the present invention contains 100 parts by weight of a thermoplastic resin, a length/diameter ratio (aspect ratio) of about 5 or more and less than about 20, and a BET specific surface area of about 20 m ² /
high aspect ratio, low specific surface area fibrous magnesium hydroxide particles having an average diameter of about 0.1 to about 10 microns and a length of about 1 to about 15 microns;
130 parts by weight of a flame retardant resin composition having improved moldability and mechanical strength. Furthermore, the present invention also relates to a method for producing the above-mentioned improving agent. Unlike the conventionally known magnesium hydroxide which has a hexagonal plate crystal structure, there is a fibrous magnesium hydroxide which has a previously unknown unique crystal shape, that is, a hexagonal needle crystal structure, and this new type of magnesium hydroxide. It has been discovered that magnesium hydroxide can be produced industrially and advantageously by easy means, and an application has already been filed by the same applicant (Japanese Patent Application Laid-Open No. 112400/1989; corresponding US Pat. No. 4246254). Furthermore, another method for producing the fibrous magnesium hydroxide has been discovered and has already been filed by the same applicant (Japanese Patent Application Laid-open No. 104994/1983). Furthermore, it has been discovered that the above-mentioned fibrous magnesium hydroxide having a specific aspect ratio is particularly useful as an agent for improving the mechanical strength and flame retardancy of flame-retardant resin compositions. An application was filed (Japanese Patent Application Laid-open No. 74137/1983). JP-A No. 56-74137 discloses that 100 parts by weight of a resin and a compound selected from the group consisting of fibrous magnesium hydroxides and fibrous hydrotalcites having a length/diameter ratio of about 20 or more are disclosed. A flame-retardant resin composition with improved mechanical strength, characterized by containing about 0.5 to about 100 parts by weight of at least one kind, and improved mechanical strength and flame retardancy for resin formulations used to provide the composition. The agent and its manufacturing method are disclosed. However, the aforementioned JP-A-54-112400 (corresponding U.S. Patent No. 4246254), JP-A-55-104994, and JP-A-56-74137 disclose high aspect ratio fibrous magnesium hydroxide, its production method, Further, although the use thereof is disclosed, there is no mention of the BET specific surface area of the high aspect ratio fibrous magnesium hydroxide. Therefore, it is not surprising that these prior proposals are particularly relevant to the interrelated binding factors and selection guidelines for both aspect ratio and BET specific surface area of the fibrous magnesium hydroxide for resin compounding applications. teeth,
Not mentioned at all. The present inventors have conducted research in order to further improve the flame retardant resin composition with improved mechanical strength proposed in the above-mentioned Japanese Patent Application Laid-open No. 74137/1983. As a result, it was discovered that the binding factor between the aspect ratio of the fibrous magnesium hydroxide and the BET specific surface area is an important factor in resin compounding applications. Further, the aspect ratio is about 5 or more and less than about 20, the BET specific surface area is about 20 m ² /g or less, and the average diameter is about 0.1 to about 10 μ and about 1 to about
Fibrous magnesium hydroxide having a hexagonal needle-like crystal structure with a high aspect ratio and low specific surface area having a length of 15μ is different from ordinary magnesium hydroxide having a conventionally known and commonly used hexagonal plate-like crystal structure. In comparison, it can demonstrate surprising improvement effects, for example,
The high aspect ratio, low specific surface area fibrous magnesium hydroxide can achieve impact strength comparable to the impact strength obtained by blending about 60% by weight of ordinary magnesium hydroxide, with about 30% by weight, half of that amount. Furthermore, moldability related to molded product appearance, molding pressure, flow during molding, filling amount, etc. has been significantly improved.
It has been discovered that it is possible to mix a large amount of about 130 parts by weight to 100 parts by weight of resin, and it is possible to provide a composition that exhibits excellent mechanical strength and flame retardancy. Furthermore, according to research by the present inventors, the above aspect ratio is about 5 or more and less than about 20, and BET
Fibrous magnesium hydroxide with a high aspect ratio and a low specific surface area with a specific surface area of about 20 m ² /g or less is disclosed in the above-mentioned JP-A-54-112400 (corresponding U.S. Patent No.
4246254), JP-A-55-104994, etc., and in particular by adopting an amount of alkali less than the amount of alkali specifically disclosed in these prior proposals. It's been found. For example, in the proposal of JP-A-54-112400, the amount of alkali used is approximately equivalent to about twice the equivalent of the anion A ^n- of the acicular crystalline basic magnesium compound; Although the proposal in No. 104994 proposes a similar amount of alkali to be used, the fibrous magnesium hydroxide with a high aspect ratio and low specific surface area used in the above-mentioned present invention has a lower amount of alkali to be used, for example, about the amount of anion A ^n- . 0.1～
It was found that suitable production was achieved using an amount of 0.9 equivalent of alkali. Furthermore, the fibrous magnesium hydroxide having a high aspect ratio and low specific surface area tends to have a relatively thick diameter compared to the fibrous magnesium hydroxide obtained by the method disclosed in the above proposal. However, it is not necessary to separate and remove them, and for use in the present invention. I realized that there was no problem. Therefore, an object of the present invention is to provide a flame-retardant resin composition with improved moldability and mechanical strength. The above objects and many other objects and advantages of the present invention will become more apparent from the following description. Conventional magnesium hydroxide has a hexagonal plate-like crystal shape, and when observed under an optical or electron microscope, it has a shape such as a hexagon, a plate with rounded corners, a fragment thereof, or an aggregate thereof. observed as crystals. On the other hand, the fibrous magnesium hydroxide used in the present invention has the advantage of having a completely different fibrous or acicular shape at first glance, and is clearly distinguishable from conventionally used magnesium hydroxide and hydrotalcite. Can be distinguished. In the present invention, among such fibrous magnesium hydroxides, the measurement and calculation method for fibrous magnesium hydroxides is specified in the above-mentioned Japanese Patent Application Laid-open No. 112400/1983. The length/diameter ratio determined under the following conditions is approximately 5 or more and less than approximately 20, and the BET specific surface area is approximately 20 m ² /g.
and an average diameter of about 0.1 to about 10 microns and a length of about 1 to about 15 microns. Even if the length/diameter ratio is about 5 or more and less than about 20, the use of fibrous magnesium hydroxide with a BET specific surface area of more than about 20 m ² /g will reduce the flowability during resin kneading and molding. This deteriorates the appearance of the molded product and makes it difficult to obtain sufficient improvement in mechanical properties due to poor compatibility between the resin and fibrous magnesium hydroxide. In addition, the use of fibrous magnesium hydroxide with a length/diameter ratio of about 20 or more, for example about 40 or more, reduces the flowability during resin kneading and molding, resulting in decreased workability and poor molded appearance. It also makes it difficult to incorporate into resins in amounts of 100 parts by weight or more. Therefore, in the present invention, the length/diameter ratio is about 5 or more and less than about 20, preferably about 7 to about 15, and the BET specific surface area is about 20 m ² /g or less,
Preferably, about 2 to about 10 m ² /g of fibrous magnesium hydroxide is selectively utilized. The above-mentioned fibrous magnesium hydroxide used in the present invention has an average diameter of about 0.1 to about 10 μm and a diameter of about 1 to about 10 μm.
It has a length of about 15 μm, a length/diameter ratio of about 5 or more and less than about 20, and a BET surface area of about 20 m ² /g or less. The fibrous magnesium hydroxides can be surface treated with anionic surfactants, often with favorable results. In such surface treatment, it is preferable to use an anionic surfactant in an amount of about 1 to about 10% by weight based on the weight of the above-mentioned fibrous magnesium hydroxide. For example, a compound selected from the group consisting of fibrous magnesium hydroxides and fibrous hydrotalcites is added to a water-soluble anionic surfactant such as sodium stearate with sufficient stirring, or , conversely, in a suspension of these powders,
Anionic surfactants are chemically adsorbed onto the surface of these solid powders by adding an aqueous solution of sodium stearate. As described above, surface treatment improves dispersibility and improves fluidity, which is effective in improving workability. The anionic surface activator used has the formula
Higher fatty acid alkali salt represented by RCOOM (in the formula, R represents a C ₃ to C ₄₀ alkyl group and M represents an alkali metal atom): ROSO ₃ M (in the formula,
Alkyl sulfate represented by the formula RSO ₃ M (wherein R and M are the same as above): R-
an alkylaryl sulfonate represented by aryl-SO ₃ M (wherein R and M have the same meanings as above, and aryl is, for example, benzene, toluene, naphthalene): and the formula

[Formula] Sulfosuccinic acid ester salt represented by (wherein R and M have the same meanings as above) Alkyl sulfuric acid represented by ROSO ₃ HN(C ₂ H ₄ OH) ₃ (wherein R has the same meanings as above) Ester salt: formula

[Formula] (In the formula, R is represented by the same meaning as above) Alkyl phosphate: An alkylamine acetate represented by the formula RNH ₂ CH ₃ COOM (In the formula, R and M are the same as above): etc. Specific examples of such surfactants include sodium stearate, potassium stearate, sodium oleate, potassium oleate, sodium palmitate,
Potassium palmitate, sodium laurate, potassium laurate, potassium behenate, sodium laurylbenzenesulfonate, potassium octadecylsulfonate, sodium laurylsulfonate, disodium/2-sulfoethyl/α-sulfostearate-traurylsulfate triethanolamine, stearylamine Examples include sodium acetate, potassium stearylamine oleate, lauryl phosphate, Igepon T, Igepon A, and Ultrabon. In the composition of the present invention, about 10 to about 130 parts by weight of the above-mentioned fibrous magnesium hydroxide particles, more preferably about 100 parts by weight of the thermoplastic resin, are used.
30 to about 120 parts by weight. Examples of thermoplastic resins used in such compositions include polymers or copolymers of ethylene, propylene, butene-1, and other α-olefins; one or more of such α-olefins; Copolymers of species with conjugated or non-conjugated dienes; polystyrene or styrenic copolymers such as ABS resins vinyl chloride polymers or copolymer resins; polyesters or copolyesters; polycarbonate resins; polyamide resins; polysulfone Examples include polybutylene terephthalate resins; polyacetal resins; fluorine resins; blend resins thereof. The flame-retardant resin composition of the present invention with improved moldability and mechanical strength comprises about 10 to about 130 parts by weight of at least one of the above-exemplified resins and the above-exemplified fibrous magnesium hydroxides. In addition, other additives may be included. Examples of such other additives include, for example, non-fibrous normal magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, fibrous hydrotalcites, or non-fibrous normal hydrotalcites. Flame retardants such as carbon black, phthalocyanine, quinacridone, indoline, azo pigments, titanium oxide, cadmium pigments, colorants such as yellow lead, red iron tetroxide; for example di-t-butyl -p-
Cresol, distearylthiodipropionate, dilaurylthiodipropionate, distearylthiodipropionate, β-octylthiopropionic acid, 2,2'-methylene-bis(4-methyl-6-t-butylphenol) Antioxidants such as calcium stearate, zinc stearate, butyl stearate, ethylene bisstearamide, microwax, polyethylene wax, stearamide, palmitamide; lubricants such as organic acids; Plasticizers such as ester or derivative plasticizers, inorganic acid ester plasticizers, and hydrocarbon derivative plasticizers;
For example, flame retardant aids such as antimony oxide, tin compounds, vanadine compounds; for example, 2-hydroxy-4-octoxybenzophenone, 2(2'-hydroxy-5-methylphenyl)benzotriazole, ethyl-2- UV absorbers such as cyano-3,8-diphenylacrylate; for example, talc, mica, ballastonite, calcium silicate, aluminum silicate, calcium carbonate, asbestos, glass fiber, magnesium oxide,
Examples of additives include fillers such as kaolin clay, pyrofluorite, titanium dioxide, and sericite; and the like. The amount of these other additives to be used can be selected as appropriate, but for example, from about 0.1% to 1% based on the weight of the resin.
About 40% flame retardants, about 0.1% to 10% colorants,
About 0.1% to about 10% antioxidants, about 0.1% to about 5% lubricants, about 0.1% to about 50% plasticizers, about 0.1% to about 5%
Examples of amounts used include about 10% flame retardant aids, about 0.1% to about 5% ultraviolet absorbers, and about 10% to about 100% fillers. The composition of the present invention can be formed by mixing as uniformly as possible the resins described above, fibrous magnesium hydroxide, and, if desired, other additives such as those exemplified above. The mixing means itself can be selected as appropriate. As such a mixing means, for example, ordinary kneading methods such as a roll, a Banbury mixer, a kneader, a single screw extruder, a twin screw extruder, a Henschel mixer, etc. can be applied. The fibrous magnesium hydroxide and fibrous hydrotalcites used in the method of the present invention can be produced, for example, by the following method. Fibrous magnesium hydroxide has the following formula: Mg(OH) ₂ − _ox・A ^n- _x・mH ₂ O In the formula, A ^n- represents a monovalent or divalent anion (n=1 or 2). , x is 0.2≦x≦0.5, and m is 0<m≦2. A basic magnesium compound in the form of needle crystals represented by is mixed with an alkali of about 0.5 to 0.9 equivalents of the anion A ^n- in a liquid medium that is inert to the compound and does not dissolve the compound, and about 100 It can be produced by contacting and hydrothermally treating at a temperature of ℃ or higher. At this time, the basic magnesium compound in the form of acicular crystals is dried under conditions such that the compound does not lose its acicular crystals so that part of the crystal water of the compound is eliminated, and the dried product is dried. It can also be produced by alkali treatment in the above liquid medium. In the former embodiment, the acicular basic magnesium compound is placed in a liquid medium such as water or a water-containing lower alcohol without drying, and the anion
About 0.5-0.9 equivalents of A ^n- , more preferably about 0.5-0.8
Fibrous magnesium hydroxide can be produced by contacting it with an equivalent amount of alkali at a temperature of about 100°C or higher. In the latter embodiment, after drying the acicular basic magnesium compound to such an extent that some of the crystallization water is removed but not all of it is lost, the fibrous magnesium hydroxide is treated with an alkali in the same manner as above. can be manufactured. For drying, any method capable of drying the basic magnesium compound to such an extent that the acicular shape is not lost can be used, for example,
Any known means such as hot air drying, vacuum drying, kiln drying, spray drying, and fluidized bed drying can be employed. Examples of the alkali used in the alkali treatment include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and inorganic alkalis such as ammonia, calcium hydroxide, and ammonium hydroxide. The alkali treatment can be easily carried out by suspending the acicular basic magnesium compound, which may or may not have been subjected to the drying treatment as described above, in a liquid medium as described above, and allowing the suspension to interact with an alkali. For example, the magnesium compound may be added and suspended in a medium to which an alkali has been added and dissolved in advance, or both may be added and suspended at the same time. An alkali may be added and brought into contact with the cloudy system. The reaction time may be, for example, about 10 minutes to 10 hours. By this alkali treatment, the anion A ^n- of the acicular basic magnesium compound of the above formula is replaced with OH-,
The aspect ratio is about 5 or more and less than about 20, and
Fibrous magnesium hydroxide particles having a BET specific surface area of about 20 m ² /g or less can be formed. Hereinafter, some embodiments of the present invention will be described with reference to Examples.
It will be explained in more detail. Example 1-3 1.7 kg of magnesium oxide was added to 200 mg of an aqueous magnesium chloride solution having a concentration of 2 mol/2, and heated to about 60° C. while stirring. Thereafter, heating was stopped and the mixture was allowed to cool to room temperature. Approximately 2 kg was generated as a result.
Basic magnesium chloride (X
As a result of line analysis, this compound is Mg ₃ (OH) ₃ Cl・
4H ₂ O) was separated, washed with water, and then resuspended in approx. This system has about
Add 2Mol/aqueous sodium hydroxide solution in an amount equivalent to 0.6 equivalent to the basic magnesium chloride Cl, and transfer to an autoclave with a capacity of 50.
Hydrothermal treatment was performed at about 180°C for 4 hours. After that, it was filtered, washed with water, and dried.The result was approximately 1.4Kg.
As measured by an electron microscope, the aspect ratio of g is approximately
12, diameter is approximately 0.5μ, and BET specific surface area is 6
m ² /g of magnesium hydroxide was obtained. It was confirmed by X-ray analysis that this compound was magnesium hydroxide. 1 kg of high aspect ratio magnesium hydroxide obtained by the above method was suspended in warm water (approximately 60°C), and while stirring, the mixture was suspended in warm water (approximately 60°C) containing approximately 20 g of sodium oleate. Add approx.
Stirring was continued for 10 minutes, and the surface of the high aspect ratio magnesium hydroxide was coated with oleate ions. After that, it was filtered, washed with water, and dried. The high aspect ratio surface coated product obtained in this way was added to polypropylene at the compounding ratio shown in Table 1, and after mixing, it was melt-kneaded through an extruder at about 220°C. The pellets, which had been dried for 1 hour at about 230°C, were molded into test pieces with a thickness of about 3 mm. Comparative Example 1 In Example 1, about 2 kg of basic magnesium chloride having a needle-like external shape obtained by the same process was suspended in water, and then about 2 mol/aqueous sodium hydroxide solution was added to the basic magnesium chloride. An amount equivalent to 1.6 equivalents of magnesium was added to Cl, and the mixture was stirred gently at about 25° C. for 2 hours. As a result, about 1.4 kg of magnesium hydroxide was obtained, which had an aspect ratio of about 50, a diameter of about 0.07 μm, and a BET specific surface area of 16 m ² /g as measured by an electron microscope. After washing this magnesium hydroxide with water and resuspending it in water, the surface treatment with sodium oleate was performed in the same manner as in Example 1. This treated product was blended with polypropylene at the blending ratio shown in Table 1 in the same manner as in Example 1 and tested. Comparative Example 2 In Example 1, about 2 mol/sodium hydroxide, which is equivalent to 1.2 equivalents, was added to the Cl of the obtained needle-shaped magnesium hydroxide, and then,
Hydrothermal treatment was performed at 120°C for 4 hours. As a result, observation using an electron microscope revealed that magnesium hydroxide had an aspect ratio of 17, a diameter of 0.08 μm, and a BET specific surface area of 28 m ² /g. This magnesium hydroxide was surface-treated with sodium oleate in the same manner as in Example 1. This treated product was blended with polypropylene at the blending ratio shown in Table 1, and melt-kneaded and molded in the same manner as in Example 1. Example 4 About 4.8 kg of magnesium oxide was added to about 4 mol/magnesium chloride aqueous solution 10, and while stirring,
Heated to 80°C. Thereafter, it was allowed to cool to room temperature and aged for about 2 days, producing basic magnesium chloride (Mg ₂ (OH) ₃ Cl.3H ₂ O) having a needle-like external shape.
This material was further added to an aqueous solution of about 2 mol/magnesium chloride, aged, and the crystals were sufficiently developed, then washed separately with water, further suspended in water, and then added with about 2 mol/ml of sodium hydroxide. 0.5 equivalent to Cl was added and hydrothermal treatment was performed in an autoclave at 170°C for 5 hours. After that, it was filtered and washed with water. The obtained compound is
As a result of observation using an electron microscope, the aspect ratio is approximately
13, the diameter is about 0.7μ, and the BET specific surface area is 3
m ² /g of magnesium hydroxide. This high aspect ratio magnesium hydroxide 1Kg
After suspending in 10 g of water, 25 g of Igepon T
(CH ₃ (CH ₂ ) ₇ CH=CH (CH ₂ ) ₇ CON (CH ₃ )
An aqueous solution 1 containing CH ₂ CH ₂ SO ₃ Na) was added to the suspension and continued at about 40° C. with stirring for about 30 minutes. Thereafter, the mixture was filtered, washed with water, dried, and crushed as appropriate.
This material was mixed with nylon-6 at the compounding ratio shown in Table 1, passed through an extruder at about 23°C, melted and kneaded to make pellets, and dried in vacuum at about 120°C. Injection molded at ℃. Example 5 1 kg of high aspect ratio magnesium hydroxide obtained in Example 1 was added to about 70° C. hot water with stirring to prepare a hot water solution at about 70° C. containing about 40 g of potassium stearate. 1 and continue stirring for about 10 minutes. After this, after filtering, washing with water, drying, and pulverizing, the mixture ratio shown in Table 1 is used.
Added to hard polyvinyl chloride (800) along with 2 parts by weight of tribasic lead sulfate and 0.5 parts by weight of calcium stearate, passed through an extruder at about 170°C to form pellets, and dried the pellets at 120°C for 2 hours.
Injection molded at approximately 180°C. Example 6 The sodium oleate treated high aspect ratio magnesium hydroxide obtained in Example 1 was mixed with a copolymer of ethylene and propylene at the blending ratio shown in Table 1, and the mixture was passed through an extruder at about 220°C. After making pellets, they were dried at about 120°C for 1 hour and then injection molded at about 230°C. Example 7 A suspension obtained by adding 120 g of magnesium oxide to 2 mol/mol of magnesium sulfate was placed in an autoclave with a capacity of 5 and subjected to hydrothermal treatment at 170° C. for 6 hours. The resulting compound was basic magnesium sulfate of the formula Mg ₆ (OH) ₁₀ SO ₄ .3H ₂ O with a needle-like crystalline shape. After filtering and washing this compound with water, suspend it in water and add 0.9 equivalents to SO ₄ .
4Mol/potassium hydroxide was added, and hydrothermal treatment was performed in an autoclave at 170°C for 6 hours. As a result of measurement using an electron microscope, the obtained compound exhibited a fibrous crystal external shape with an aspect ratio of 8 and a diameter of 0.8 μm. Furthermore, as a result of X-ray analysis, this compound was found to be magnesium hydroxide.
The BET specific surface area was 11 m ² /g. 1 kg of this compound was added to 10 g of water, and while stirring, 10 g of an aqueous solution 1 of sodium laurylbenzenesulfonate was added, and stirring was continued for about 20 minutes. Thereafter, it was filtered, washed with water, dried, and crushed. This powder was added to high-density polyethylene at the mixing ratio shown in Table 1, mixed, passed through an extruder at about 240°C to form pellets, dried at about 120°C for 1 hour, Injection molded at ℃. In Table 1 below, the diameter and length of the magnesium hydroxide used in Examples 1 to 7 all satisfied the scope of the present invention.

[Table] Example 5

Comparative Example 3 Basic magnesium chloride obtained in the same manner as in Example 1 was suspended in water, 0.4 equivalents of 2 ml/aqueous sodium hydroxide solution was added to the Cl of the basic magnesium chloride, and the suspension was autoclaved. , hydrothermal treatment was performed at 170°C for 4 hours. after that,
After filtering and washing with water, the surface was treated with sodium oleate in the same manner as in Example 1, and then dehydrated and dried. The diameter obtained in this way
Magnesium hydroxide having a length of 0.5 μm, a length of 1.0 μm, and an aspect ratio of 2 was added to polypropylene at the compounding ratio shown in Table 2, and the same operation as in Example 1 was performed to prepare a test piece and evaluate it. The second result is
Shown in the table. Comparative Example 4-5 Same as in Example 1 except that the magnesium hydroxide blended was changed to 2 parts by weight/Comparative Example 41 and 200 parts by weight (Comparative Example 5) with respect to 100 parts by weight of polypropylene. I went. The evaluation results are shown in Table 2. Comparative Example 6 Into 200 2Mol/magnesium nitrate aqueous solution,
120 ml of 1Mol/calcium hydroxide was added, and the reaction was continued for 12 hours while stirring and maintaining the temperature at about 30°C. Thereafter, the obtained basic magnesium nitrate was separated, washed with water, and suspended in water again. To this, add 2.0 equivalents of 2Mol/sodium hydroxide to the nitric acid of the basic magnesium nitrate, and
Heated at 95°C for 1 hour. The obtained magnesium hydroxide was surface-treated with sodium oleate in the same manner as in Example 1 by adding about 3% by weight of sodium oleate to the magnesium hydroxide. This magnesium hydroxide has a diameter of 0.05μm,
The length was 0.9 μm, the aspect ratio was 18, and the BET specific surface area was 20 m ² /g. This magnesium hydroxide was blended with polypropylene at the blending ratio shown in Table 2, and the physical properties were evaluated. The results are shown in Table 2.

【table】

Claims (1)

[Claims] 1. 100 parts by weight of a thermoplastic resin and a length/diameter ratio (aspect ratio) of about 5 or more and less than about 20,
About 10 high aspect ratio, low specific surface area fibrous magnesium hydroxide particles having a BET specific surface area of about 20 m ² /g or less, an average diameter of about 0.1 to about 10 μ, and a length of about 1 to about 15 μ. A flame-retardant resin composition with improved moldability and mechanical strength, characterized in that it contains about 130 parts by weight. 2. The composition according to claim 1, wherein the fibrous magnesium hydroxide particles are surface-treated with an anionic surfactant. 3. Claim 1 or 2, wherein the resin is an olefin resin or a blend thereof.
Compositions as described in Section.