JPH1067889A - Flame-retardant polyolefin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-retardant polyolefin compsn. which gives a molded item excellent in resistance to plane impact by compounding a polyolefin with magnesium hydroxide and a specific ester. SOLUTION: A condensed aliph. hydroxy acid obtd. by subjecting an aliph. hydroxy acid to condensation by dehydration under heating is esterified with a polyol in the presence of a catalyst (e.g. sodium hydroxide) to give an ester (B). 100 pts., wt. compsn. (A) prepd. by compounding a polyolefin with 30-70 wt.% magnesium hydroxide having an average particle size of 0.1-10×m gm is compounded. 1-5 pts. wt. ingredient B, kneaded, and pelletized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant polyolefin composition from which a molded article having excellent surface impact resistance can be obtained.

[0002]

2. Description of the Related Art In general, various halogen-based flame retardants have been blended with polyolefins as means for making polyolefins flame-retardant, and are widely used in practice. However, a flame-retardant polyolefin composition containing a halogen-based flame retardant generates a harmful halogen-based gas during combustion. Therefore, a non-halogen-based flame retardant has recently been required as a flame retardant to be used. Among various non-halogen flame retardants, inorganic flame retardants that do not generate harmful combustion gas, especially magnesium hydroxide, are widely used in practice because of their high dehydration decomposition temperature and excellent smoke suppression effect during combustion. . However, in order to obtain practical flame retardancy, magnesium hydroxide must be filled at a high level, that is, a large amount of magnesium hydroxide must be added, and a magnesium hydroxide-containing flame-retardant polyolefin obtained due to a decrease in the dispersibility of the magnesium hydroxide. Depending on various specific applications, the composition may not have sufficient mechanical properties, especially surface impact resistance, and there is a problem that expansion of the specific applications is limited.

[0003] For the purpose of improving the dispersibility of a high filling system of magnesium hydroxide, Japanese Patent Application Laid-Open No. 1-90234 discloses a composition comprising an olefin resin mixed with an inorganic powder such as magnesium hydroxide. A) Monoglyceride content is 50
A glycerin ester of a fatty acid having 8 to 22 carbon atoms, which is at least by weight, and (B) a trivalent to tetravalent aliphatic alcohol, and a fatty acid having 8 to 22 carbon atoms and an aliphatic dibasic acid are reacted in substantially equivalent amounts. At least one selected from esters obtained by
Highly filled polyolefin resin compositions containing inorganic compounds having improved processability and containing various kinds of ester compounds are disclosed in
-320438 No. (a) a polyolefin resin, (b) an inorganic powder such as magnesium hydroxide, (c) a higher fatty acid having 24 to 40 carbon atoms, an ester thereof, at least one selected from the group consisting of amides and metal salts. A compound, and
(d) Inorganic highly filled compositions containing hydrocarbons having 40 or more carbon atoms have been proposed. On the other hand, JP-A-6-1515
No. 7 discloses a method of adding a dispersant composed of an ester of a condensed hydroxy fatty acid having a degree of condensation of at least 2 or more to a polyhydric alcohol to a ceramic powder such as a metal oxide as an essential component. A method for dispersing a ceramic powder in a medium has been proposed, and JP-A-6-31152 discloses, as an essential component, an ester of a condensed hydroxy fatty acid having a condensation degree of at least 2 or more and a polyhydric alcohol having 4 or more hydroxyl groups. A method of dispersing a coloring agent for a synthetic resin to which a dispersing agent is added is proposed. Further, JP-A-7-97487 discloses a polyolefin resin (1), an antistatic agent (2) and a polyhydric alcohol-condensed hydroxy fatty acid. A resin composition obtained by adding a mixture with an ester (3) has been proposed, which is generally used for a polyolefin such as a filler if necessary. By adding an additive it has been described that may be.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
JP-A-4-320438, JP-A-6-15157, JP-A-6-31152 and JP-A-7-97487 disclose a composition in which a polyolefin is mixed with magnesium hydroxide and a polyol. There is no description or suggestion of improving the surface impact resistance of a molded article obtained from a flame-retardant polyolefin composition containing an ester with a condensed aliphatic hydroxy acid. The present inventors have intensively studied to obtain a flame-retardant polyolefin composition which gives a molded article having the above-mentioned problem relating to the magnesium hydroxide-containing flame-retardant polyolefin composition, that is, an improved surface impact resistance. as a result,
The present inventor provides a flame-retardant polyolefin composition comprising a magnesium hydroxide-containing flame-retardant polyolefin composition and a specific amount of an ester of a polyol and a condensed aliphatic hydroxy acid. The present invention has been found based on this finding. As is apparent from the above description, an object of the present invention is to provide a flame-retardant polyolefin composition having improved surface impact resistance of a molded article when the article is formed.

[0005]

The present invention has the following arrangement. An ester of a polyol and a condensed aliphatic hydroxy acid (hereinafter referred to as Compound A) is added to 100 parts by weight of a composition obtained by mixing 30 to 70% by weight of magnesium hydroxide with a polyolefin.
That. ) Is 0.1 to 5 parts by weight.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The polyolefin used in the present invention is ethylene, propylene, butene-1, pentene-1, 4-
Α- such as methyl-pentene-1, hexene-1, octene-1
Crystalline homopolymer of olefin, two or more of these α-
Olefinic crystalline, low crystalline or amorphous random copolymer or crystalline block copolymer, amorphous ethylene
Polyolefins such as -propylene-non-conjugated diene terpolymer, amorphous ethylene-cyclic alkene copolymer (for example, amorphous ethylene-tetracyclododecene copolymer), the above-mentioned α-olefin and vinyl acetate Or a copolymer with an acrylic acid ester, a saponified product of the copolymer,
Copolymers of these α-olefins and unsaturated silane compounds, copolymers of these α-olefins and unsaturated carboxylic acids or anhydrides, reaction products of the copolymers and metal ion compounds, Examples include modified polyolefins obtained by modifying polyolefins with unsaturated carboxylic acids or derivatives thereof, and silane-modified polyolefins obtained by modifying the above-mentioned polyolefins with unsaturated silane compounds. These polyolefins may be used alone, or two or more kinds may be used. Can be used in combination.

In addition, various synthetic rubbers (for example, polybutadiene, polyisoprene, polychloroprene, chlorinated polyethylene, chlorinated polypropylene, fluorinated rubber, styrene-butadiene rubber, hydrogenated styrene-butadiene rubber, acrylonitrile-butadiene) are added to the above-mentioned polyolefin. Rubber, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-propylene-butylene-styrene block copolymer) or heat Plastic synthetic resins (for example, polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naf Tallates, polybutylene naphthalate, polycarbonate, polyvinyl chloride, chlorinated polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, fluorine resin, petroleum resin (e.g. C ₅ petroleum resins, hydrogenated C ₅ petroleum resins, C ₉ Petroleum resin, hydrogenated C ₉
System petroleum resin, C ₅ -C ₉ copolymer petroleum resin, softening point, such as hydrogenated C ₅ -C ₉ copolymer petroleum resin, acid-modified C ₉ petroleum resin 80-200
℃ petroleum resin), DCPD resins (e.g. cyclopentadiene petroleum resin, hydrogenated cyclopentadiene petroleum resins, cyclopentadiene -C ₅ copolymer petroleum resin, hydrogenated cyclopentadiene -C ₅ copolymer petroleum resin, cyclopentadiene -C ₉ copolymer petroleum resin, hydrogenated cyclopentadiene -C ₉ copolymer petroleum resin, cyclopentadiene -C ₅ -C ₉ copolymer petroleum resin, softening point 80, such as hydrogenated cyclopentadiene -C ₅ -C ₉ copolymer petroleum resin ~ 200 ° C DCPD resin) or the like. Crystalline propylene homopolymer,
A crystalline propylene copolymer containing at least 70% by weight of a propylene component, comprising a crystalline ethylene-propylene random copolymer, a crystalline ethylene-propylene block copolymer, and a crystalline propylene-butene-1 random copolymer Particularly, a crystalline ethylene-propylene-butene-1 terpolymer, a crystalline propylene-hexene-butene-1 terpolymer and a mixture of two or more thereof are particularly preferably used.

As the magnesium hydroxide used in the present invention, plate-like and fibrous ones can be used without any limitation. The average particle size of the plate-like magnesium hydroxide is not particularly limited, but is usually 0.1 μm to 10 μm, preferably 0.2 μm.
μm to 2 μm, most preferably 0.5 μm to 1 μm, and the fiber diameter of the fibrous magnesium hydroxide is 0.1 μm to 0.5 μm.
μm and a length of 5 μm to 20 μm are preferred. These magnesium hydroxides can be used alone, or two or more magnesium hydroxides can be used in combination. The mixing ratio of the magnesium hydroxide is 30 to 70% by weight, preferably 50 to 65% by weight based on the composition comprising the polyolefin and the magnesium hydroxide from the viewpoint of flame retardancy and surface impact resistance.
It is.

The compound A used in the present invention is a partial or complete ester of a polyol and a condensed aliphatic hydroxy acid. Polyols such as glycerin, diglycerin, triglycerin, pentaglycerin, hexaglycerin, octaglycerin, polyglycerin such as decaglycerin, sorbitol, mannitol, sorbitan,
Sucrose, pentaerythritol, dipentaerythritol, polypentaerythritol such as tripentaerythritol, trimethylolethane, trimethylolpropane, polyoxyethylene glycerin, polyoxyethylene sorbitan and the like can be exemplified. It can also be used as a mixture of two or more.
Further, the condensed aliphatic hydroxy acid is a dehydration condensate of the aliphatic hydroxy acid, and means one having a degree of condensation of 2 or more. The degree of condensation is the average number of condensed aliphatic hydroxy acids obtained from the average molecular weight of the condensed aliphatic hydroxy acids. Aliphatic hydroxy acids include glycolic acid, lactic acid, hydroacrylic acid, α-oxybutyric acid, tartronic acid, glyceric acid, malic acid, tartaric acid, mesotartaric acid, grapeic acid, citric acid, 2-hydroxytetradecanoic acid, iprolic acid, 2 -Hydroxyhexadecanoic acid, yarapinolic acid, uniperic acid, ambrettolic acid, aluritic acid, 2-hydroxyoctadecanoic acid, 12-hydroxyoctadecanoic acid, 18-hydroxyoctadecanoic acid, 9,10-dihydroxyoctadecanoic acid, ricinoleic acid, camloren Acid, ferronic acid, cerebronic acid and the like can be exemplified, and these can be used alone or as a mixture of two or more. The method for producing the compound A is not particularly limited, but a known method such as condensation of an aliphatic hydroxy acid with dehydration and condensation of an aliphatic hydroxy acid under heating and a polyol is added with a catalyst such as sodium hydroxide. By esterification under heating. The degree of progress of esterification during this reaction can be confirmed by measuring an acid value, a saponification value, a hydroxyl value and the like.

Accordingly, the compound A includes glycerin-condensed ricinoleic acid moieties or complete esters, diglycerin condensed ricinoleic acid moieties or complete esters, tetraglycerin condensed ricinoleic acid moieties or complete esters,
Hexaglycerin condensed ricinoleic acid part or complete ester, hexaglycerin condensed 12-hydroxyoctadecanoic acid part or complete ester, sorbitan condensed ricinoleic acid part or complete ester, sucrose condensed ricinoleic acid part or complete ester, pentaerythritol condensed ricinoleic acid part or complete Ester, dipentaerythritol condensed ricinoleic acid part or complete ester, trimethylolethane condensed ricinoleic acid part or complete ester, trimethylolpropane condensed ricinoleic acid part or complete ester, polyoxyethylene glycerin condensed ricinoleic acid part or complete ester, polyoxyethylene Examples of the sorbitan-condensed ricinoleic acid moiety or the complete ester include tetraglycerin-condensed ricinole. Le acid full ester, hexaglycerin condensed ricinoleic acid full ester, hexaglycerin condensed 12-hydroxyoctadecanoic acid full ester. Not only can these compounds A be used alone,
More than one compound A can be used in combination. Compound A
Is 0.1 to 5 parts by weight, preferably 0.5 to 3 parts by weight, based on 100 parts by weight of a composition obtained by mixing 30 to 70% by weight of magnesium hydroxide with polyolefin in terms of surface impact resistance. Compound A may be compounded by treating compound A with a surface-untreated magnesium hydroxide or a surface treating agent other than compound A (for example, higher fatty acid, metal soap, higher fatty acid ester, higher alcohol, higher fatty acid monoamide, higher fatty acid bisamide, higher fatty acid Aliphatic phosphoric acid, metal salts of higher aliphatic phosphates, higher aliphatic sulfonic acids, metal salts of higher aliphatic sulfonic acids, polyolefin waxes, oxidized polyolefin waxes, silane coupling agents, titanate coupling agents, boron couplings Hydroxide, surface-treated with magnesium hydroxide, aluminate-based coupling agent and zirco-aluminate-based coupling agent) and other compounds, or magnesium hydroxide previously treated with compound A for magnesium hydroxide Formulated with other compounds as It may be any one such as that way.

In the composition of the present invention, various additives usually added to the polyolefin, such as phenol-based, thioether-based, phosphorus-based antioxidants, light stabilizers, heavy metal deactivators (copper damage agents) Inhibitors), clarifiers, nucleating agents, lubricants, antistatic agents, anti-fogging agents, anti-blocking agents, drip-free agents, flame retardants (excluding magnesium hydroxide), flame retardant aids, inorganic and Organic antibacterial agents, pigments, radical generators such as peroxides, dispersants or neutralizers such as metal soaps, inorganic fillers (eg, talc, mica,
Clay, wollastonite, zeolite, kaolin, bentonite, perlite, diatomaceous earth, asbestos, calcium carbonate, aluminum hydroxide, hydrotalcite, basic aluminum lithium hydroxycarbonate hydrate, silicon dioxide, titanium dioxide, oxide Zinc, calcium oxide, magnesium oxide, zinc sulfide, barium sulfate, magnesium sulfate, calcium silicate, aluminum silicate, glass fiber, potassium titanate, carbon fiber, carbon black, graphite and metal fiber, etc., coupling agents (for example, The inorganic filler or the organic filler (for example, wood flour, pulp, waste paper, synthetic fiber) surface-treated with a surface treating agent such as silane-based, titanate-based, boron-based, aluminate-based, and zircoaluminate-based agents. Natural fibers, etc.) can be used in combination within limits not detrimental to the object of the present invention.

The composition of the present invention is prepared by adding predetermined amounts of magnesium hydroxide and compound A to a polyolefin and the above-mentioned various additives which are usually added to a polyolefin, using a usual mixing device such as a Henschel mixer (trade name),
Mix using a super mixer, ribbon blender, Banbury mixer, etc., and melt and knead with a usual single-screw extruder, twin-screw extruder, Brabender or roll, etc. at a temperature of 150.
C. to 300.degree. C., preferably 200.degree. C. to 250.degree. C., by melt-kneading pelletizing. The obtained composition is used for production of a target molded article by various molding methods such as an injection molding method, an extrusion molding method, and a blow molding method.

The composition of the present invention is used in applications requiring flame retardancy in various molding fields (for example, electric and electronic functional parts such as deflection yokes, CRT sockets and connectors, distributor caps, car heater cases and car air conditioners). Automotive parts such as cases and insulating materials such as electric wire covering materials).

[0014]

EXAMPLES The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The evaluation method used in the examples and comparative examples was based on the following method. 1) Surface impact resistance Evaluated by Dupont impact test. That resulting length 50 using a pellet, mm width 50 mm, a test piece having a thickness of 2mm was prepared by injection molding, measuring Dupont impact strength using the test piece (in JIS K 5400 _-1990 8.3.2 Based on the DuPont method, a 3 / 2-inch inner diameter shooting core base, a 1 / 4-inch tip radius shooting tip, and a drop height at a drop height of 1 m were used as the DuPont impact strength values using the drop energy at 50% destruction.) did. A material having excellent surface impact resistance means a material having a large DuPont impact strength. (Measurement temperature: 23 ° C) 2) Flame retardancy A flame retardancy test was performed according to a combustion test method for a polymer material by an oxygen index method. That is, a combustion test piece having a length of 150 mm, a width of 6.5 mm and a thickness of 3.0 mm was prepared by injection molding using the obtained pellets, and the oxygen index was measured using the combustion test piece (based on JIS K 7201). It evaluated by doing.

Examples 1 to 8 and Comparative Examples 1 to 5 Melt flow rate as a polyolefin (discharge rate of molten resin for 10 minutes when a load of 21.18 N at 230 ° C. is applied; hereinafter abbreviated as MFR) 6.0 g / 40% by weight of unstabilized powdery crystalline propylene homopolymer for 10 minutes
And a total of 100 parts by weight of magnesium hydroxide and 60% by weight of a surface-untreated product having an average particle size of 0.6 to 0.8 μm, as a compound A, a complete ester of hexaglycerin-condensed ricinoleic acid (condensation degree 2.5), Degree of condensation 2.1) Condensation of 12-tetraester and triglycerin
Hydroxyoctadecanoic acid (condensation degree 3.2) complete ester, tripentaerythritol condensed ricinoleic acid (condensation degree 2.5) complete ester, dipentaerythritol condensation 12-
Hydroxyoctadecanoic acid (degree of condensation 4.3) Complete ester or polyoxyethylene sorbitan condensed lactic acid (degree of condensation 1
1.5) A predetermined amount of each of the complete ester and the other additives was placed in a Henschel mixer (trade name) at a mixing ratio shown in Table 1 below, and the mixture was stirred and mixed for 3 minutes.
Was melt-kneaded at 250 ° C. in a twin-screw extruder to form pellets. Further, as Comparative Examples 1 to 5, an unstabilized powdery crystalline propylene homopolymer 40 having an MFR of 6.0 g / 10 min.
Weight% and average particle size 0.6-0.8 as magnesium hydroxide
A predetermined amount of each of the additives described in Table 1 described below is blended in a total of 100 parts by weight consisting of 60% by weight of a surface-untreated product of μm,
Pellets were obtained by melt-kneading according to Examples 1 to 8. Specimens used for DuPont impact test and combustion test,
The obtained pellets were prepared by injection molding at a resin temperature of 250 ° C. and a mold temperature of 50 ° C. Using the obtained test pieces, the surface impact resistance and the flame retardancy were evaluated by the test method described above.
The results are shown in Table 1.

Examples 9 to 16, Comparative Examples 6 to 10 Unstabilized powdery crystalline ethylene-propylene block copolymer (ethylene content 8.5% by weight) 30% by weight as polyolefin having an MFR of 7.0 g / 10 minutes Compound A, hexaglycerin condensed ricinoleic acid (condensation degree: 2.5) complete ester, sorbitol condensed ricinoleic acid (condensation degree: 2.5) Degree of condensation 2.
1) Tetraester, triglycerin condensed 12-hydroxyoctadecanoic acid (condensation degree 3.2) complete ester, tripentaerythritol condensed ricinoleic acid (condensation degree 2.5) complete ester, dipentaerythritol condensed 12-hydroxyoctadecanoic acid (condensation degree 4.3) complete Ester or polyoxyethylene sorbitan condensed lactic acid (condensation degree: 11.5) A predetermined amount of each of a complete ester and other additives was added to a Henschel mixer (trade name) in a blending ratio shown in Table 2 below, and stirred and mixed for 3 minutes. With a twin screw extruder with a diameter of 30mm
The mixture was melt-kneaded at 250 ° C. and pelletized. As Comparative Examples 6 to 10, 30% by weight of an unstabilized powdery crystalline ethylene-propylene block copolymer (ethylene content 8.5% by weight) having an MFR of 7.0 g / 10 minutes and an average particle diameter of magnesium hydroxide 0.6-0.8μm untreated surface 70
A predetermined amount of each of the additives described in Table 2 described below was blended with 100 parts by weight of the total of 100 parts by weight and melt-kneaded according to Examples 9 to 16 to obtain pellets. The test piece used for the DuPont impact test and the combustion test was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C. Using the obtained test pieces, the surface impact resistance and the flame retardancy were evaluated by the test method described above. Table 2 shows these results.
It was shown to.

Examples 17 to 24, Comparative Examples 11 to 15 50% by weight of an untreated surface of magnesium hydroxide having an average particle diameter of 0.6 to 0.8 μm (water based on a composition comprising a polyolefin and an untreated surface of magnesium hydroxide) Compound A, hexaglycerin condensed ricinoleic acid (condensation degree 2.5) complete ester, sorbitol condensed ricinoleic acid (condensation degree 2.1) tetraester, triglycerin condensed 12-hydroxyoctadecanoic acid (condensation degree 3.2) Ester, tripentaerythritol condensed ricinoleic acid (condensation degree 2.5) complete ester, dipentaerythritol condensed 12-hydroxyoctadecanoic acid (condensation degree 4.3) complete ester or polyoxyethylene sorbitan condensed lactic acid (condensation degree 11.5) complete ester In the proportions shown in Table 3 below After putting into a mixer (trade name) and stirring and mixing for 3 minutes to obtain a surface-treated product, further, as an polyolefin, an unstabilized powdery crystalline ethylene-propylene-butene-13 having an MFR of 7.0 g / 10 minutes was added. 50% by weight of copolymer (ethylene content 2.5% by weight, butene-1 content 4.5% by weight)
(Blending ratio of polyolefin to composition consisting of untreated surface of polyolefin and magnesium hydroxide)
And a predetermined amount of each of the other additives were added in the mixing ratio shown in Table 3 below and stirred and mixed for 3 minutes.
The mixture was melt-kneaded at 250 ° C. with a twin-screw extruder of 2 mm to form pellets. Further, as Comparative Examples 11 to 15, an unstabilized powdery crystalline ethylene-propylene having an MFR of 7.0 g / 10 min.
From 50% by weight of butene-1 terpolymer (2.5% by weight of ethylene content, 4.5% by weight of butene-1 content) and 50% by weight of magnesium hydroxide having an untreated surface with an average particle size of 0.6 to 0.8 μm A predetermined amount of each of the additives described in Table 3 described below was blended with the total of 100 parts by weight, and the mixture was melt-kneaded according to Examples 17 to 24 to obtain pellets. The test piece used for the DuPont impact test and the combustion test was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C.
Using the obtained test pieces, the surface impact resistance and the flame retardancy were evaluated by the test method described above. Table 3 shows the results.

Examples 25-32, Comparative Examples 16-20 55% by weight of unstabilized powdery crystalline ethylene-propylene random copolymer (ethylene content 2.5% by weight) of 7.0 g / 10 min MFR as polyolefin , Melt index (when a load of 21.18 N at 190 ° C is applied
Discharge amount of molten resin for 10 minutes; hereinafter abbreviated as MI. ) 20
g / 10 min unstabilized powdered Ziegler-Natta type high density ethylene homopolymer 10% by weight, Mooney viscosity ML1 + 4 (100 ° C) 25, unstabilized powdered amorphous ethylene-propylene Hexaglycerin condensation as compound A to a total of 100 parts by weight consisting of 5% by weight of a random copolymer (propylene content 25% by weight) and 30% by weight of untreated surface having an average particle diameter of 0.6 to 0.8 μm as magnesium hydroxide Ricinoleic acid (condensation degree 2.5) complete ester, sorbitol condensed ricinoleic acid (condensation degree 2.1) tetraester,
Triglycerin condensed 12-hydroxyoctadecanoic acid (condensation degree 3.2) complete ester, tripentaerythritol condensed ricinoleic acid (condensation degree 2.5) complete ester, dipentaerythritol condensed 12-hydroxyoctadecanoic acid (condensation degree 4.3) complete ester or polyoxyethylene Predetermined amounts of sorbitan condensed lactic acid (condensation degree: 11.5) and other additives were added to a Henschel mixer (trade name) at the mixing ratio shown in Table 4 below, and mixed by stirring for 3 minutes. The mixture was melt-kneaded at 250 ° C. with a screw extruder to form pellets. MF as Comparative Examples 16 to 20
An unstabilized powdery crystalline ethylene-propylene random copolymer having an R of 7.0 g / 10 min (ethylene content of 2.5
55% by weight, unstabilized powdered Ziegler-Natta type high-density ethylene homopolymer of 55% by weight, MI of 20g / 10min, 10% by weight, Mooney viscosity ML1 + 4 (100 ° C) of 25 stabilized 5% by weight of a powdery amorphous ethylene-propylene random copolymer (propylene content 25% by weight) and 30% by weight of magnesium hydroxide having an untreated surface having an average particle size of 0.6 to 0.8 μm A predetermined amount of each of the additives described in Table 4 described below was blended in parts by weight, and
Pellets were obtained by melt-kneading according to 25-32. The test piece used for the DuPont impact test and the combustion test was prepared by injection molding the obtained pellet at a resin temperature of 250 ° C and a mold temperature of 50 ° C. Using the obtained test pieces, the surface impact resistance and the flame retardancy were evaluated by the test method described above. Table 4 shows the results.

The compounds and additives according to the present invention shown in Tables 1 to 4 are as follows. Magnesium hydroxide: untreated surface with an average particle size of 0.6 to 0.8 μm Compound A [1]: complete ester of hexaglycerin condensed ricinoleic acid (condensation degree 2.5) Compound A [2]: sorbitol condensed ricinoleic acid (condensation degree 2.1) tetra Ester Compound A [3]: Triglycerin condensed 12-hydroxyoctadecanoic acid (condensation degree 3.2) complete ester Compound A [4]: Tripentaerythritol condensed ricinoleic acid (condensation degree 2.5) complete ester Compound A [5]: dipentaerythritol Condensed 12-hydroxyoctadecanoic acid (condensation degree 4.3) complete ester Compound A [6]: Polyoxyethylene sorbitan condensed lactic acid (condensation degree 11.5) complete ester

Phenolic antioxidant 1: 2,6-di-t-butyl-p-cresol Phenolic antioxidant 2: tetrakis [methylene-3-
(3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane Dispersant 1: stearic acid Dispersant 2: glyceryl monostearate Dispersant 3: epoxidized soybean oil Dispersant 4: stearic acid Amide Ca-St: calcium stearate

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

[0024]

[Table 4]

The examples and comparative examples shown in Table 1 are cases in which a crystalline propylene homopolymer is used as the polyolefin and an untreated product is used as the magnesium hydroxide. As can be seen from Table 1, Examples 1 to 8 were obtained by blending magnesium hydroxide (untreated surface) and Compound A with a crystalline propylene homopolymer. In comparison with Examples 1 to 8 in which a dispersant is not blended), Examples 1 to 8 are remarkably excellent in surface impact resistance. Also, when comparing Examples 1 to 8 with Comparative Examples 2 to 5 (compounds of Examples 1 to 8 in which dispersants 1 to 4 other than Compound A were respectively substituted), Comparative Example 1 was obtained. Although the surface impact resistance of Comparative Examples 2 to 5 is improved, Examples 1 to 8 are superior in surface impact resistance,
Dispersant 1 other than Compound A in magnesium hydroxide high-filled system 1
Nos. 4 to 4 show that the effect of improving the mechanical properties by the dispersing action is not sufficiently exhibited. Therefore, it is clear that each comparative example that does not satisfy the compounding of the compound A according to the present invention does not exhibit the effects of the present invention. That is, the surface impact resistance obtained in the present invention can be said to be a unique effect that can be seen only when compound A is used in combination with the flame-retardant polyolefin composition containing magnesium hydroxide. Also,
It was confirmed that the flame retardant composition according to the present invention comprising the compound A had flame retardancy comparable to that of a conventionally known flame retardant composition.

Table 2 shows the results obtained by using a crystalline ethylene-propylene block copolymer as the polyolefin and an untreated product as the magnesium hydroxide. The same effects as described above were confirmed for these. Table 3 shows that the polyolefin is crystalline ethylene-propylene-butene-1.
A terpolymer and a surface-treated product previously surface-treated with compound A as magnesium hydroxide were used, and the same effects as described above were confirmed for these. Table 4 shows a mixture of a crystalline ethylene-propylene random copolymer, a Ziegler-Natta high-density ethylene homopolymer and an amorphous ethylene-propylene random copolymer as a polyolefin, and an untreated product as magnesium hydroxide. In these cases, the same effects as described above were confirmed.

[0027]

The composition of the present invention, when formed into a molded product, has remarkably excellent surface impact resistance.

Claims (1)

[Claims] 1. Polyolefin is magnesium hydroxide 30.
The ester of the polyol and the condensed aliphatic hydroxy acid is 0.1 to 100 parts by weight of the composition containing
A flame-retardant polyolefin composition containing 5 parts by weight.