JP2024011405A - Resin composition, and molded product of the resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition that reduces the amount of addition of an antimony-based flame retardant while still achieving high levels of flame retardancy.

SOLUTION: A resin composition according to an embodiment comprises a resin of 100 pts.wt., a hydrotalcite of the formula (1) in an amount of 3 pts.wt. or more relative to 100 pts.wt. of the resin, and an antimony-based flame retardant of 5 pts.wt. or less. In the formula (1): Mg_xAl₂(OH)_yCO₃nH₂O, x denotes a number equal to or greater than 4.3, y denotes a number equal to or greater than 12.6, and n denotes a number equal to or greater than 3.0).

SELECTED DRAWING: None

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a resin composition and a molded article using the resin composition.

Resin compositions containing synthetic resins such as vinyl chloride resin are used for covering materials such as electric wires and cables. These uses require heat resistance and flame retardancy. Therefore, for example, a composition in which a stabilizer and a flame retardant are added to vinyl chloride resin is used. As the flame retardant, antimony-based flame retardants such as antimony trioxide and antimony pentoxide, metal hydrates such as aluminum hydroxide and magnesium hydroxide, zinc borate, and the like are used. It is known that by adding a large amount of these flame retardants, a highly flame retardant composition can be obtained. Among these, antimony-based flame retardants have excellent flame retardancy, and are suitably used, for example, in outer covering materials (coating materials) for electric wires that require high flame retardancy (Patent Document 1). Since antimony is a heavy metal, there are concerns about environmental pollution, and regulations are being implemented. Therefore, there is a need for a resin composition that reduces the amount of antimony-based flame retardant used and has high flame retardancy.

Japanese Patent Application Publication No. 2022-44096

The present invention has been made to solve the above problems, and its main purpose is to reduce the amount of antimony-based flame retardant added and to provide a resin composition that has high flame retardancy.

1. The resin composition of the embodiment of the present invention contains 100 parts by weight of a resin, 3 parts by weight or more of hydrotalcite represented by formula (1), and an antimony-based flame retardant based on 100 parts by weight of the resin. 5 parts by weight or less:
Mg _x Al ₂ (OH) _y CO ₃・nH ₂ O (1)
(In the formula, x is a number of 4.3 or more, y is a number of 12.6 or more, and n is a number of 3.0 or more).
2. Above 1. In the resin composition described in , the hydrotalcite represented by the above formula (1) is Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ ·3.5H ₂ O, or Mg _6.0 Al ₂ ( OH) ₁₆ CO ₃ .4H ₂ O may be used.
3. Above 1. or 2. In the resin composition described in , the hydrotalcite represented by the above formula (1) may be Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ ·3.5H ₂ O.
4. Above 1. From 3. In the resin composition according to any one of the above, the resin composition may contain 3 parts by weight to 60 parts by weight of hydrotalcite represented by the above formula (1).
5. Above 1. From 4. In the resin composition according to any one of the above, the resin may be a thermoplastic resin.
6. In one embodiment, a shaped body is provided. This molded body is the same as described in 1. From 5. It consists of a resin composition according to any one of the above.
7. In one embodiment, a dressing is provided. This covering material is the same as described in 1. From 5. The resin composition according to any one of the above is used.
8. In one embodiment, an electrical wire is provided. This electric wire is the same as described in 7. Covered with the coating material described in .

According to the resin composition of the embodiment of the present invention, it is possible to reduce the amount of antimony-based flame retardant added and to provide a resin composition having high flame retardancy. Furthermore, since the amount of antimony-based flame retardant added can be reduced, environmental pollution caused by heavy metals can also be suppressed.

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

A. Resin Composition The resin composition of the present invention contains 100 parts by weight of a resin, 3 parts by weight or more of hydrotalcite represented by formula (1), and an antimony flame retardant based on 100 parts by weight of the resin. 5 parts by weight or less. The resin composition of the embodiment of the present invention contains hydrotalcite represented by formula (1). The resin composition containing this hydrotalcite has a reduced amount of antimony-based flame retardant added and can have high flame retardancy.
Mg _x Al ₂ (OH) _y CO ₃・nH ₂ O (1)
(In the formula, x is a number of 4.3 or more, y is a number of 12.6 or more, and n is a number of 3.0 or more).

B. Resin Any suitable resin can be used as the resin. Examples include thermoplastic resins and thermosetting resins. Preferably, thermoplastic resin is used. Any suitable resin can be used as the thermoplastic resin. For example, vinyl chloride systems such as polyvinyl chloride, polyvinylidene chloride, chlorinated polyethylene, chlorinated polypropylene, ethylene-vinyl chloride copolymer, ethylene-vinyl chloride-vinyl acetate graft copolymer, vinyl chloride-propylene copolymer, etc. C2 to C8 (having 2 to 8 carbon atoms) olefin (α-olefin) polymers such as resin, polyethylene, polypropylene, ethylene-propylene copolymer, polybutene, poly(4-methylpentene-1), or copolymers thereof Examples include polyolefin resins such as copolymers of these C2 to C8 olefins and dienes, styrene resins such as polystyrene, ABS resins, AAS resins, AS resins, and MBS resins, and urethane resins. Preferably, vinyl chloride resin is used. Only one type of thermoplastic resin may be used, or two or more types may be used in combination.

Any suitable resin can be used as the thermosetting resin. For example, epoxy resins such as bisphenol A epoxy resin and bisphenol F epoxy resin, phenolic resins such as novolak phenol resin and polyoxystyrene, melamine resins such as butylated melamine resin, urea resin, unsaturated polyester resin, and bismaleimide resin. , urethane resins, etc. Only one type of thermosetting resin may be used, or two or more types may be used in combination.

C. Antimony-based flame retardant Any suitable antimony-based flame retardant can be used as the antimony-based flame retardant. Examples include antimony trioxide, antimony tetroxide, antimony pentoxide, and sodium antimonate. Preferably, antimony trioxide can be used. Only one kind of antimony-based flame retardant may be used, or two or more kinds may be used in combination.

The content of the antimony-based flame retardant is 5 parts by weight or less, preferably 3 parts by weight or less, more preferably 1 part by weight or less, and even more preferably 0.5 parts by weight or less, based on 100 parts by weight of the resin. When used in combination with hydrotalcite represented by formula (1), it is possible to reduce the amount of antimony-based flame retardant added and provide a resin composition having high flame retardancy. In one embodiment, the resin composition may not contain an antimony-based flame retardant (that is, the content of the antimony-based flame retardant is 0 parts by weight). According to the resin composition of the embodiment of the present invention, even when it does not contain an antimony-based flame retardant, it can have high flame retardancy. Furthermore, environmental pollution caused by the use of antimony-based flame retardants can also be suppressed.

D. Hydrotalcite The resin composition of the embodiment of the present invention contains 3 parts by weight or more of hydrotalcite represented by formula (1). A resin composition containing hydrotalcite represented by formula (1) can have a reduced amount of an antimony-based flame retardant and can have high flame retardancy. In one embodiment, the resin composition of the present invention does not contain an antimony-based flame retardant. By using 8 parts by weight or more of hydrotalcite represented by formula (1), high flame retardance (for example, V-0 rating by UL-94V flame test) is achieved even when antimony-based flame retardants are not included. ). Hydrotalcite is generally used in resin compositions as a stabilizer that imparts heat resistance. When the resin composition of the embodiment of the present invention contains hydrotalcite represented by formula (1), it can have high flame retardancy without using other flame retardants such as antimony-based flame retardants. Only one type of hydrotalcite represented by formula (1) may be used, or two or more types may be used in combination.
Mg _x Al ₂ (OH) _y CO ₃・nH ₂ O (1)
(In the formula, x is a number of 4.3 or more, y is a number of 12.6 or more, and n is a number of 3.0 or more).

In formula (1), x is a number of 4.3 or more, preferably a number of 4.5 to 8.0, more preferably a number of 4.5 to 7.0, and even more preferably 4 It is a number between .5 and 6.0. In formula (1), y is a number of 12.6 or more, preferably a number of 13 to 18, more preferably a number of 13 to 17, and still more preferably a number of 13 to 16. In formula (1), n is a number of 3.0 or more, preferably a number of 3.5 to 7.0, more preferably a number of 3.5 to 6.0, and even more preferably 3 It is a number between .5 and 4.0.

The hydrotalcite represented by formula (1) is preferably Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ .3.5H ₂ O or Mg _6.0 Al ₂ (OH) ₁₆ CO ₃ . 4H ₂ O can be used, and more preferably Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ .3.5H ₂ O can be used. By using these hydrotalcites, it is possible to reduce the amount of antimony-based flame retardant added and to provide a resin composition having high flame retardancy.

As the hydrotalcite represented by formula (1), a commercially available product may be used. Examples include HT-88F and HT-6 manufactured by Sakai Chemical Industry Co., Ltd.

The BET specific surface area of the hydrotalcite represented by formula (1) is preferably 5 m ² /g to 20 m ² /g. If the BET specific surface area of the hydrotalcite represented by formula (1) is less than 5 m ² /g, the contact area with the resin may decrease, making it difficult to obtain the expected flame retardant effect. On the other hand, if the BET specific surface area of the hydrotalcite expressed by formula (1) exceeds 20 m ² /g, the hydrotalcite may aggregate, resulting in a decrease in dispersibility in the resin and a decrease in resin physical properties. . The BET specific surface area of the hydrotalcite represented by formula (1) is more preferably 6 m ² /g to 19 m ² /g, and even more preferably 7 m ² /g to 18 m ² /g.

The hydrotalcite represented by formula (1) has any suitable shape. For example, it may be plate-shaped, spherical, disc-shaped, etc. Note that the particle shape can be observed using a scanning electron microscope or the like.

The hydrotalcite represented by formula (1) may be subjected to any appropriate surface treatment. Any suitable surface treating agent can be used as the surface treating agent. For example, higher fatty acids such as stearic acid and palmitic acid, higher fatty acid metal salts such as sodium stearate, anionic surfactants, phosphoric acid esters, coupling agents such as silane coupling agents, titanium coupling agents, and aluminum coupling agents. can be mentioned. Only one type of surface treatment agent may be used, or two or more types may be used in combination. The amount of surface treatment agent used can be set to any appropriate value. Preferably, the amount is from 1 part by weight to 10 parts by weight, more preferably from 1 part by weight to 6 parts by weight, based on 100 parts by weight of unsurface-treated hydrotalcite.

The content of hydrotalcite represented by formula (1) is 3 parts by weight or more, preferably 3.5 parts by weight or more, and more preferably 4 parts by weight or more based on 100 parts by weight of the resin. . If the hydrotalcite represented by formula (1) is 3 parts by weight or more, the amount of antimony-based flame retardant added can be reduced and a resin composition with excellent flame retardancy can be provided. The content of hydrotalcite represented by formula (1) is, for example, 60 parts by weight or less, preferably 55 parts by weight or less, based on 100 parts by weight of the resin. When the content of hydrotalcite represented by formula (1) exceeds 60 parts by weight, the physical properties may deteriorate, and the processability and handleability of the resin composition may deteriorate.

In one embodiment, the content of hydrotalcite represented by formula (1) is preferably 8 parts by weight or more, more preferably 15 parts by weight or more, and even more preferably is 20 parts by weight or more, particularly preferably 30 parts by weight or more. When the content of hydrotalcite represented by formula (1) is within the above range, it has high flame retardancy equivalent to that of a resin composition containing an antimony flame retardant even if it does not contain an antimony flame retardant. A resin composition can be provided. In this embodiment, the content of hydrotalcite represented by formula (1) is, for example, 60 parts by weight or less, preferably 55 parts by weight or less, based on 100 parts by weight of the resin. When the content of hydrotalcite represented by formula (1) exceeds 60 parts by weight, the physical properties may deteriorate, and the processability and handleability of the resin composition may deteriorate. In this embodiment, the content of the antimony-based flame retardant in the resin composition may be 0 parts by weight (that is, the resin composition does not contain the antimony-based flame retardant).

E. Other Additives The resin composition may contain any other appropriate additives other than the antimony-based flame retardant and the hydrotalcite represented by formula (1). Other additives include, for example, plasticizers, stabilizers such as organic acid metal salts, β-diketone compounds, fillers, waxes, heat resistance aids, ultraviolet absorbers, antioxidants, crosslinking aids, and antimony-based additives. Examples include flame retardants other than flame retardants. These additives may be used alone or in combination of two or more.

Any suitable plasticizer can be used as the plasticizer. Examples include phthalic acid ester compounds, adipic acid ester compounds, phosphoric acid ester compounds, and trimellitic acid ester compounds. More specifically, dioctyl phthalate (DOP), diisononyl phthalate (DINP) and diisodecyl phthalate (DIDP) are used as phthalate ester compounds, dioctyl adipate (DOA) is used as an adipic acid ester compound, and trioctyl is used as a trimellitic acid ester compound. Examples include trimellitate (TOTM) and the like. As the plasticizer, preferably a trimellitic acid ester compound is used.

The content of plasticizer can be any suitable amount. For example, the amount is from 30 parts by weight to 100 parts by weight, preferably from 40 parts by weight to 80 parts by weight, and more preferably from 45 parts by weight to 60 parts by weight, based on 100 parts by weight of the resin. When the content of the plasticizer is within the above range, the flexibility of the resin composition can be improved.

Any suitable organic metal salt can be used as the organic metal salt. By including an organic acid metal salt, for example, when a vinyl chloride resin is used, chlorine in the vinyl chloride resin is stabilized, and discoloration can be suppressed during processing or use. Therefore, a molded article can be obtained without deteriorating its appearance.

Any suitable organic acid can be used as the organic acid in the organic acid metal salt. For example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, 2-ethylhexylic acid, neodecanoic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, Isostearic acid, stearic acid, 12-hydroxystearic acid, behenic acid, montanic acid, benzoic acid, monochlorobenzoic acid, pt-butylbenzoic acid, dimethylhydroxybenzoic acid, 3,5-di-t-butyl-4- Hydroxybenzoic acid, toluic acid, dimethylbenzoic acid, ethylbenzoic acid, cumic acid, n-propylbenzoic acid, aminobenzoic acid, N,N-dimethylaminobenzoic acid, acetoxybenzoic acid, salicylic acid, pt-octylsalicylic acid, Monovalent organic carboxylic acids such as elaidic acid, oleic acid, linoleic acid, linoleic acid, thioglycolic acid, mercaptopropionic acid, octylmercaptopropionic acid; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, Suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, hydroxyphthalic acid, chlorophthalic acid, aminophthalic acid, maleic acid, fumaric acid, citraconic acid, methaconic acid, itaconic acid, aconitic acid, thiodipropionic acid Divalent organic carboxylic acids such as monoesters or monoamide compounds of divalent organic carboxylic acids, trivalent or tetravalent such as butanetricarboxylic acid, butanetetracarboxylic acid, hemimellitic acid, trimellitic acid, merophanic acid, pyromellitic acid, etc. and di- or triesters of organic carboxylic acids. Further, some of the hydrogen atoms constituting these organic acids may be substituted with hydroxyl groups or the like. Preferably, higher fatty acids having 12 to 20 carbon atoms are used. Specifically, preferably myristic acid, palmitic acid, isostearic acid, metal salts of stearic acid, etc. can be used. More preferably, metal salts of palmitic acid and metal salts of stearic acid are used because they are inexpensive and easily available. Note that a compound that corresponds to both an organic acid metal salt and a β-diketone compound, such as zinc dehydroacetate described later, is referred to as a β-diketone compound in this specification. That is, the organic acid metal salt is a metal salt of an organic acid other than a β-diketone compound.

Examples of the metal forming the organic acid metal salt include alkaline earth metals such as Ca, Sr, and Ba, and Zn, Pb, and Sn. Among organic acid metal salts, those containing Pb are called lead-based stabilizers, those containing Sn are called Sn-based stabilizers, and stabilizers that do not contain Pb and are not classified as Sn-based stabilizers are generally called Ca-based stabilizers. /Zn-based stabilizer. The Ca/Zn-based stabilizer does not mean only those containing both Ca and Zn, but also includes stabilizers containing only Zn, and stabilizers containing neither Ca nor Zn, nor Sn. Further, in addition to Ca and Zn, a stabilizer containing a metal element other than Pb such as Sn as an auxiliary agent may also be included in the Ca/Zn-based stabilizer. In this specification, those containing Sn in a content of 0.5 parts by weight or less are referred to as Ca/Zn-based stabilizers, and those containing Sn in excess of 0.5 parts by weight are referred to as Sn-based stabilizers. shall be.

The content of the organic acid metal salt can be set to any appropriate value. For example, it is preferably at least 0.01 part by weight, more preferably at least 0.1 part by weight, based on 100 parts by weight of the resin. If the content of the organic metal salt is within the above range, discoloration can be suppressed. Further, the content of the organic metal salt is preferably 5 parts by weight or less, more preferably 2 parts by weight or less, based on 100 parts by weight of the resin. Thereby, the heat resistance can be further improved, the appearance of the molded article will not deteriorate more, and the color tone can also be made better.

Any suitable compound can be used as the β-diketone compound. For example, stearoyl acetylmethane, benzoylacetylmethane, dibenzoylmethane, stearoylbenzoylmethane, octylbenzoylmethane, bis(4-octylbenzoyl)methane, 4-methoxybenzoylbenzoylmethane, bis(4-carboxymethylbenzoyl)methane, 2- Examples include alkanoylaroylmethanes and dialoylmethanes such as carboxymethylbenzoylacetyloctylmethane and 2-benzoylcyclohexane; dehydroacetic acid; and metal salts thereof. When containing a β-diketone compound, it is possible to improve the coloring property during molding. When the resin composition is used as a wire coating material, it is suitable that zinc dehydroacetate is included. In the resin additive industry, zinc dehydroacetate is recognized as a metal salt of a β-diketone compound, so it will be treated similarly in this specification.

The β-diketone compound can be used in any suitable content. For example, the amount is preferably 2 parts by weight or less, more preferably 0.1 part to 1 part by weight, based on 100 parts by weight of the resin.

Any suitable filler can be used as the filler. Examples include inorganic powders such as inorganic salts, inorganic oxides, and inorganic hydroxides. Specific examples include salts, oxides, hydroxides, and composite oxides of zinc, titanium, iron, cerium, barium, calcium, silicon, aluminum, magnesium, strontium, boron, zirconium, and the like. Any suitable salts can be used as the salts. Examples include sulfates, carbonates, hydrochlorides, acetates, nitrates, and the like. Specifically, for example, calcium carbonate, zinc carbonate, magnesium carbonate, silica, zinc oxide, titanium oxide, cerium oxide, iron oxide, barium sulfate, strontium sulfate, magnesium sulfate, silicon oxide, aluminum oxide, magnesium oxide, silicic acid. Examples include zinc, zinc titanate, barium titanate, clay, and talc. Preferably it is calcium carbonate. When a filler is included, the dimensional stability and strength of the molded article are improved, so the resin composition becomes preferable for use in molded articles.

Any suitable wax can be used as the wax. Examples include hydrocarbon waxes such as polyethylene wax and paraffin wax, and/or fatty acid ester waxes. Specifically, polyethylene waxes include, for example, the Hiwax series manufactured by Mitsui Chemicals, the Sunwax series manufactured by Sanyo Chemical Industries, Ltd., the Viscoll series manufactured by Sanyo Chemical Industries, Ltd., and the Luvax series manufactured by Nippon Seiro Co., Ltd. . Examples of the ester waxes include the Rikesta series manufactured by Riken Vitamin Co., Ltd. and the Roxiol series manufactured by Emery Co., Ltd., and the like. When wax is included, it is possible to adjust the resin kneading state during molding and to adjust the appearance of the molded product, such as gloss.

The wax content can be set to any suitable value. For example, the amount is preferably 0.01 part by weight to 1 part by weight, more preferably 0.05 part by weight to 0.5 part by weight, based on 100 parts by weight of the resin.

Examples of the heat resistance aid include polyhydric alcohol compounds such as dipentyritol, and epoxy compounds such as epoxy resins. Examples of the lubricant include stearic acid monoglyceride, palmitic acid monoglyceride, stearic acid, and palmitic acid.

Any suitable flame retardant can be used as the flame retardant other than the antimony-based flame retardant. Examples include bromine flame retardants such as tetrabromoethane and hexabromobenzene, phosphorus flame retardants such as ammonium phosphate and trimethyl phosphate, and nitrogen flame retardants such as melamine compounds and cyanuric acid compounds.

F. Method for Preparing Resin Composition The resin composition of the embodiment of the present invention can be produced by any suitable method. For example, the resin, antimony-based flame retardant, hydrotalcite represented by formula (1), and any other appropriate additives may be mixed by any appropriate means. Mixing can be done by any suitable method. For example, it is preferable to mix with a Henschel mixer or a super mixer, and then uniformly knead the resulting mixture using a roll, Banbury mixer, extruder, or the like.

G. Applications The resin composition of the embodiment of the present invention can be used for any appropriate application. As described above, the resin composition of the embodiment of the present invention has excellent flame retardancy. Therefore, it can be suitably used in applications requiring flame retardancy. In one embodiment, a shaped body is provided. A molded article according to an embodiment of the present invention is made using the above resin composition. In one embodiment, the resin composition of the embodiment of the present invention can be suitably used as a wire coating material for heat-resistant wires, insulated wires, and the like. In one embodiment, a wire coating is provided. The wire covering material of the embodiment of the present invention is formed using the above resin composition. In one embodiment, an electrical wire is provided. The electric wire of the embodiment of the present invention may be coated with the above coating material.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

[Example 1]
100 parts by weight of vinyl chloride resin (manufactured by Shin-Etsu Chemical Co., Ltd.: TK-1000), a plasticizer (manufactured by Mizushima Plasticizer Co., Ltd., octyl trimellitate (TOTM)), an insulating agent (manufactured by Shiraishi Calcium Co., Ltd., product name: BURGESS 30) (clay)), stabilizer (calcium zinc stabilizer, manufactured by Sakai Chemical Industry Co., Ltd., product name: OW-3141Y), antimony-based flame retardant (antimony trioxide, manufactured by Yamanaka Sangyo Co., Ltd., product name: MSW), and the formula Hydrotalcite represented by (1) (Hydrotalcite A, manufactured by Sakai Chemical Industry Co., Ltd., product name: HT-88F, Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ 3.5 H ₂ O, BET ratio Surface area: 10.2 m ² /g) were mixed in the contents shown in Table 1 to obtain a resin composition.

[Examples 2 to 6]
The same procedure as in Example 1 was carried out, except that the contents of the antimony-based flame retardant and hydrotalcite A were changed as shown in Table 1, or the hydrotalcite used was changed to hydrotalcite B. A resin composition was obtained.
In addition, as hydrotalcite B, hydrotalcite (manufactured by Sakai Chemical Industry Co., Ltd., product name: HT-6, Mg _6.0 Al ₂ (OH) ₁₆ CO _{3.4H 2} O, BET specific surface area: 15.9 m ² /g) coated with 4% higher fatty acid metal salt (sodium stearate) was used.

(Comparative Examples 1 to 4)
Example 1 except that the content of the antimony-based flame retardant and the hydrotalcite represented by formula (1), and the hydrotalcite used (hydrotalcite C or D) were changed as shown in Table 1. A resin composition was obtained in the same manner as above.
In addition, as hydrotalcite C, product name: HT-1 (Mg _4.0 Al ₂ (OH) ₁₂ CO _{3.3H 2} O, BET specific surface area: 9.2 m ² /g) manufactured by Sakai Chemical Industry Co., Ltd. Hydrotalcite D manufactured by Sakai Chemical Industry Co., Ltd. Product name: HT-7 (Mg _3.5 Zn _0.5 Al ₂ (OH) ₁₃ CO _{3.3.5H 2} O, BET specific surface area: 6.9 m ² / g) were used, respectively.

<Evaluation>
The resin compositions obtained in Examples or Comparative Examples were kneaded for 5 minutes using an 8-inch roll machine (manufactured by KANSAI ROLL Co., Ltd.) whose roll surface temperature was adjusted to 170° C. to produce a roll sheet with a thickness of 0.6 mm. Three of the obtained sheets were stacked and pressed at a pressure of 20 kg/cm ² to 50 kg/cm ² to a thickness of 1.5 mm using a press machine (TOYOSEIKI MINI TEST PRESS-10) with a press surface temperature of 170°C. It was held for 5 minutes. Next, the sheet was cut to produce six test pieces each measuring 125 mm±5 mm in length and 13 mm±5 mm in width.
Using the prepared test piece, a combustion test was conducted using a combustion tester (manufactured by Suga Test Instruments Co., Ltd.) in accordance with the UL-94V standard. Specifically, the test piece was attached vertically to a clamp, and a 20 mm flame was applied for 10 seconds to measure the burning time. A combustion test was conducted on five test pieces, and the number of samples burned to the clamp, the maximum value (max) of each combustion time, and the sum of the five combustion times (total combustion time: total) were recorded. Further, based on the results, judgments were made using the criteria of V-0, V-1, V-2, and fail. V-0 is the best flame retardant, and V-1, V-2, and fail indicate lower degrees of flame retardancy.

The resin compositions of Examples of the present application had a reduced content of antimony-based flame retardant and had high flame retardancy (V-0 rating in the UL-94V combustion test).

The resin composition of the present invention has high flame retardancy. Therefore, it can be suitably used, for example, in applications where flame retardancy is required, such as electric wire coating materials.

Claims (8)

100 parts by weight of resin,
With respect to 100 parts by weight of the resin, 3 parts by weight or more of hydrotalcite represented by formula (1),
Resin composition containing 5 parts by weight or less of an antimony-based flame retardant Mg _x Al ₂ (OH) _y CO ₃ ·nH ₂ O (1)
(In the formula, x is a number of 4.3 or more, y is a number of 12.6 or more, and n is a number of 3.0 or more). The hydrotalcite represented by the formula (1) is Mg _4.5 Al ₂ (OH) _{13 CO} 3.3.5H ₂ O, or Mg _6.0 Al ₂ (OH) ₁₆ CO _{3.4H 2} The resin composition according to claim 1, which is O. The resin composition according to _claim 1, wherein the hydrotalcite represented by the formula ₍ 1 ₎ is _Mg4.5Al2 (OH) _13CO3.3.5H2O . The resin composition according to claim 1, comprising 3 to 60 parts by weight of hydrotalcite represented by formula (1). The resin composition according to claim 1, wherein the resin is a thermoplastic resin. A molded article using the resin composition according to any one of claims 1 to 5. A coating material using the resin composition according to any one of claims 1 to 5. An electric wire coated with the coating material according to claim 7.