JP4241210B2 - Ethylene polymer composition and method for producing the same - Google Patents

Description

【００６０】
【発明の効果】
本発明によれば、溶融張力が高く、溶融張力と流動性とのバランスに優れたエチレン系重合体組成物及びその製造方法を提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ethylene polymer composition and a method for producing the same.
[0002]
[Prior art]
Conventionally, various attempts have been made to further improve the properties of polyolefins. For example, a reaction between a silane coupling agent such as an alkoxyaminosilane compound and a modified polyolefin, and a reaction product thereof are disclosed (for example, see Patent Documents 1-5). Among these, publications other than Patent Document 1 only disclose a composition comprising a simple combination of a modified polyolefin and an alkoxyaminosilane compound, and a silane compound and a polymer having properties in which the silane compound can be highly dispersed. The combination with is not mentioned. In the case of such a simple combination, an improvement in the melt tension of the composition cannot be expected, and the composition may be gelled.
[0003]
On the other hand, Patent Document 1 discloses a composition in which an unmodified polyolefin is further blended with a composition in which a modified polyolefin and a silane compound are blended. However, this composition is intended to impart chemical properties such as adhesion and paintability to polyolefin, and is not intended to improve mechanical properties such as melt tension of polyolefin.
[0004]
[Patent Document 1]
JP 59-184272 A
[Patent Document 2]
JP-A-1-501949
[Patent Document 3]
JP-A-4-348106
[Patent Document 4]
JP-A-5-112694
[Patent Document 5]
JP 2001-226535 A
[0005]
[Problems to be solved by the invention]
In general, in order to improve the melt tension of an ethylene-based polymer, it is indispensable to use complicated processes and special equipment.
Therefore, it has been required to improve the melt tension of the ethylene-based polymer by combining extremely general-purpose equipment and practical raw materials.
[0006]
An object of the present invention is to provide an ethylene polymer composition having a high melt tension and an excellent balance between melt tension and fluidity, and a method for producing the same.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an ethylene polymer composition obtained by mixing the following (A), (B) and (C).
(A) Melt flow ratio is 0.01 to 100 g / 10 min, and density is 0.890 to 0.970 g / cm.^ThreeUnmodified ethylene polymer
(B) A modified ethylene system containing 0.001 to 1% by weight of a polar group derived from a compound containing an ethylenic double bond and a polar group in the same molecule and having an intrinsic viscosity of 0.7 to 5.0 dl / g Polymer
(C) Silane coupling agent
[0008]
According to the second aspect of the present invention, the melt tension (MT) and the melt flow ratio (MI) include MT / (MI) including the following (A), (B) and (C):^-0.8An ethylene polymer composition satisfying the relationship of> 7 is provided.
(A) Unmodified ethylene polymer
(B) A modified ethylene polymer containing a polar group derived from a compound containing an ethylenic double bond and a polar group in the same molecule
(C) Silane coupling agent
[0009]
According to the third aspect of the present invention, the silane coupling agent (C) and the unmodified ethylene polymer (A) are mixed so that the silane coupling agent (C) is contained in an amount of 10 to 10,000 ppm. And the manufacturing method of an ethylene-type polymer composition including mixing 0.1-30 weight part of said modified ethylene polymer (B) with respect to 100 weight part of this mixture is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the ethylene polymer composition of the present invention will be described.
The ethylene polymer composition of the present invention is obtained by mixing the following (A), (B) and (C).
(A) Melt flow ratio is 0.01 to 100 g / 10 min, and density is 0.890 to 0.970 g / cm.^ThreeUnmodified ethylene polymer
(B) A modified ethylene system containing 0.001 to 1% by weight of a polar group derived from a compound containing an ethylenic double bond and a polar group in the same molecule and having an intrinsic viscosity of 0.7 to 5.0 dl / g Polymer
(C) Silane coupling agent
[0011]
First, each component of the composition of this invention is demonstrated.
Examples of the unmodified ethylene polymer (A) include a high-density polyethylene, a low-density polyethylene, and a random copolymer of ethylene and an α-olefin (for example, propylene, 1-butene, 1-hexene, 1-octene, etc.). Examples thereof include a polymer, a block copolymer, and a graft copolymer. Of these, low density polyethylene is preferable. These may be used individually by 1 type, and may be used in combination of 2 or more types.
[0012]
The unmodified ethylene polymer (A) has a melt flow ratio of 0.01 to 100 g / 10 minutes, preferably 0.1 to 50 g / 10 minutes. When it is less than 0.01 g / 10 minutes, the moldability of the composition is lowered. On the other hand, when it exceeds 100 g / 10 minutes, the mechanical properties of the composition are lowered.
[0013]
The unmodified ethylene polymer (A) has a density of 0.890-0.970 g / cm.^Three, Preferably 0.900 to 0.950 g / cm^ThreeIt is. 0.890 g / cm^ThreeWhen it becomes less than, melting | fusing point falls. On the other hand, 0.970 g / cm^ThreeIf it exceeds, moldability will deteriorate.
Such an unmodified ethylene polymer (A) can be produced by a known method.
[0014]
The modified ethylene polymer (B) has a polar group part derived from a compound containing an ethylenic double bond and a polar group in the same molecule (hereinafter referred to as a modifier), preferably 0.001 to 1% by weight, It is not particularly limited as long as it is an ethylene polymer containing 0.01 to 0.5% by weight and having an intrinsic viscosity of 0.7 to 5.0 dl / g, preferably 1.0 to 2.5 dl / g.
[0015]
When the content of the polar base is less than 0.001% by weight, the effect of improving the melt tension becomes small. On the other hand, if it exceeds 1% by weight, a gel component is by-produced.
When the intrinsic viscosity is less than 0.7 dl / g, the effect of improving the melt tension becomes small. On the other hand, if it exceeds 5.0 dl / g, a gel component is by-produced.
The content of the polar base can be determined by film-forming the modified ethylene polymer (B) and measuring the Fourier transform infrared absorption spectrum using it.
[0016]
The polar group part of the modified ethylene polymer (B) includes a carboxylic acid group, a carboxylic acid anhydride group, a carboxylic acid ester group, a carboxylic acid halide group, a carboxylic acid amide group, a carboxylic acid imide group, a carboxylic acid group, and a sulfonic acid group. , Polar groups such as sulfonic acid ester groups, sulfonic acid chloride groups, sulfonic acid amide groups, sulfonic acid groups, epoxy groups, amino groups, and oxazoline groups. Of these, a carboxylic acid group and a carboxylic anhydride group are preferable.
[0017]
The modifier used in the present invention is not particularly limited, but is preferably an unsaturated carboxylic acid containing the above polar group and / or a derivative thereof.
As unsaturated carboxylic acid or its derivative (s), unsaturated mono- or dicarboxylic acid, or these derivatives are mentioned, for example. Specific examples of these derivatives include anhydrides, esters, halides, amides, imides, and salts of carboxylic acids. Among these, unsaturated dicarboxylic acid or its anhydride is preferable.
[0018]
Specific examples of unsaturated mono- or dicarboxylic acids include acrylic acid, methacrylic acid, maleic acid, endo-bicyclo [2.2.1] -5-heptene-2,3-dicarboxylic acid (endic acid), fumaric acid Tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid and the like.
[0019]
Specific examples of the unsaturated carboxylic acid derivative include maleenyl chloride, maleimide, maleic anhydride, endic acid anhydride, methyl acrylate, acrylic acid amide, methyl methacrylate, glycidyl methacrylate, methacrylic acid amide, citraconic anhydride, Itaconic anhydride, nadic anhydride, monomethyl maleate, dimethyl maleate, monomethyl fumarate, dimethyl fumarate and the like can be mentioned.
[0020]
Of these unsaturated carboxylic acids or derivatives thereof, acrylic acid, methacrylic acid, maleic acid and maleic anhydride are preferred, and maleic anhydride is more preferred. These may be used individually by 1 type, and may be used in combination of 2 or more types.
[0021]
The modified ethylene polymer (B) preferably satisfies the following (1) to (3).
(1) Molecular weight distribution (Mw / Mn) is 2-6
(2) Density is 0.890-0.970 g / cm^Three
(3) The molar ratio between the polar base and the polymer chain is 0.8-2.
[0022]
In said (1), when molecular weight distribution (Mw / Mn) becomes less than 2, it may become difficult to make a modified ethylene polymer (B). On the other hand, if it exceeds 6, the amount of low molecular weight component increases, and therefore, the improvement in tension may be slowed by the addition of a small amount of the modified ethylene polymer (B). This molecular weight distribution is preferably 2.5-4. Here, Mw represents a weight average molecular weight, and Mn represents a number average molecular weight. These can be measured by a gel permeation chromatograph (GPC) method.
[0023]
In (3) above, when the molar ratio is less than 0.8, the polar base portion is too small, and the melt tension of the resin composition may not be improved. On the other hand, if it exceeds 2, the molecular chain may be cut too much, and the intrinsic viscosity may be reduced. This molar ratio is preferably 0.9 to 1.5.
This ratio means the ratio between the number of polymer chains (mol / g) of the modified polymer (B) calculated from the number average molecular weight (Mn) and the content of the polar base (mol / g). In the case of 1, one molecule of modifier is added per polymer chain.
[0024]
Such a modified ethylene polymer (B) can be produced, for example, by melt-kneading the unmodified ethylene polymer (A), a radical initiator, and the modifier. At this time, conditions, such as a mixing | blending condition and reaction conditions, can be suitably adjusted so that the ratio of a polar base may be 0.001-1 weight%.
[0025]
Examples of the radical initiator include butyl peroxide, α, α-bis (t-butylperoxy) diisopropylbenzene, benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, t-butyl peracetate, t-butyl perdiethyl acetate, t-butyl perisobutyrate, t-butyl-sec-octoate, t-butyl perpivalate, cumyl perpivalate, t-butyl perbenzoate, t-butyl perphenyl acetate, t-butyl cumyl peroxide, di- -T-butyl peroxide, 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, 1,1-di-t-butylperoxycyclohexane, 2,2-di- (t-butylperoxy) Butane, lauroyl peroxide 2,5-dimethyl-2,5-di (peroxybenzoate) hexyne-3, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,4-bis (t-butylperoxyisopropyl) benzene, 2, 5-Dimethyl-2,5-di (t-butylperoxy) hexyne-3, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,4,4-trimethylpentyl-2-hydro Peroxide, diisopropylbenzene hydroperoxide, cumene hydroperoxide, 4,4-di-t-butylperoxyvaleric acid-n-butyl ester, di-t-butylperoxyhexahydrophthalate, di-t-butylperoxyazelate, t -Butylperoxy-3,3,5-trimethylhexoate, t-butyl Ruperuokishi - isopropyl carbonate, succinate Nick acid peroxide, and vinyltris - (t-butylperoxy) silane. Of these, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, dicumyl peroxide, α, α-bis (t-butylperoxy) diisopropylbenzene and 2,5-dimethyl are preferable. -2,5-di (t-butylperoxy) hexane.
[0026]
The silane coupling agent (C) is not particularly limited, but is preferably an organosilicon compound represented by the following general formula (1).
X_nSiY_m(OR)_{4- (n + m)}      (1)
[Wherein, X is a substituent containing a functional group capable of reacting with a polar group, Y is a hydrogen atom, a halogen atom or a hydrocarbon group, R is a hydrocarbon group, and n is 1 2 or 3, m is 0, 1 or 2, and (n + m) is 1, 2 or 3. ]
[0027]
In the general formula (1), examples of X include a substituent containing an amino group, a hydroxyl group, an epoxy group, an isocyanate group, or a mercapto group. Of these, a substituent containing an amino group is preferable. Examples of the hydrocarbon group and R of Y include a substituted or unsubstituted alkyl group and alkenyl group having 1 to 4 carbon atoms. Of these, a methyl group and an ethyl group are preferable. n is preferably 1, m is preferably 0 to 1, and (n + m) is preferably 1 to 2.
[0028]
Examples of such organosilicon compounds include N- (2-aminoethyl) aminomethyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldiethoxysilane, and N- (2-aminoethyl). -3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-methacryloxypropyltrimethoxysilane, 3 -Glycidoxypropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxy Silane, 3-mercaptop Pills trimethoxysilane, 3-chloropropyl trimethoxy silane, and the like. Of these, 3-aminopropyltriethoxysilane is preferable. These can be used individually by 1 type or in combination of 2 or more types.
[0029]
The ethylene polymer composition of the present invention preferably contains 1 to 2,000 ppm, more preferably 10 to 500 ppm of the polar base derived from the modified ethylene polymer (B), and the silane coupling agent (C). Is preferably 10 to 10,000 ppm, more preferably 1,000 to 5,000 ppm. In terms of the amount of silicon derived from the silane coupling agent (C), it is preferably 1 to 1,000 ppm, more preferably 10 to 500 ppm.
[0030]
If the content of the polar base is less than 1 ppm, the melt tension may not be improved. On the other hand, if it exceeds 2,000 ppm, gel may be generated.
When the content of the silane coupling agent (C) is less than 10 ppm, the effect of improving the melt tension may be reduced. On the other hand, if it exceeds 10,000 ppm, the silane coupling agent (C) may not be effectively used, and the production cost may increase.
[0031]
The ethylene polymer composition of the present invention has a melt tension (MT) and a melt flow ratio (MI) of MT / (MI).^-0.8The relation of> 7 is satisfied. This ratio is preferably a value greater than 8.
A composition that satisfies this relationship is superior in that it exhibits good fluidity while maintaining a high melt tension as compared with a conventional ethylene polymer.
On the other hand, since the composition that does not satisfy this relationship has insufficient melt tension, it is difficult to use it for large blow molding and foam molding, and other uses and molding methods that are difficult to apply if the drawdown is too large. .
[0032]
  In the composition of the present invention, an antioxidant, a neutralizing agent, a nucleating agent, an ultraviolet absorber, an external lubricant, a plasticizer, an antistatic agent, a colorant, a flame retardant, a flame retardant aid, and the like, as necessary. ofAdditiveIt can mix | blend suitably. Examples of the nucleating agent include aluminum di (pt-butylbenzoate) and other carboxylic acid metal salts, methylene bis (2,4-di-tert-butylphenol) acid phosphate sodium and other phosphoric acid metal salts, talc, And phthalocyanine derivatives. Examples of the plasticizer include polyethylene glycol, polyamide oligomer, ethylene bisstearamide, phthalate ester, polystyrene oligomer, polyethylene wax, mineral oil, silicone oil, and the like. Examples of the flame retardant include brominated polystyrene, brominated syndiotactic polystyrene, brominated polyphenylene ether and the like. Examples of the flame retardant aid include antimony trioxide and other antimony compounds. theseAdditivesThese may be used alone or in combination of two or more.
[0033]
Next, the manufacturing method of the composition of this invention is demonstrated.
The composition of the present invention can be produced by mixing the following (A), (B) and (C).
(A) Melt flow ratio is 0.01 to 100 g / 10 min, and density is 0.890 to 0.970 g / cm.^ThreeUnmodified ethylene polymer
(B) Modified ethylene-based weight containing 0.001 to 1% by weight of a polar group derived from a compound containing an ethylenic double bond and a polar group in the same molecule and having an intrinsic viscosity of 0.7 to 5.0 dl / g Coalescence
(C) Silane coupling agent
In addition, the suitable example in each component, suitable conditions, etc. are as above-mentioned.
[0034]
Here, examples of the method of mixing the components include a melt-kneading method and a solution blending method. In view of economy, the melt-kneading method is preferable. The mixing of each component is preferably performed at 80 to 350 ° C., more preferably 130 to 250 ° C., preferably 1 second to 6 hours, more preferably 30 seconds to 3 hours.
[0035]
The composition of the present invention is preferably produced by the following method.
The silane coupling agent (C) and the unmodified ethylene polymer (A) are mixed so that the silane coupling agent (C) is contained at 10 to 10,000 ppm, preferably 1,000 to 5,000 ppm. . Thereafter, 0.1 to 30 parts by weight, preferably 1 to 20 parts by weight of the modified ethylene polymer (B) is mixed with 100 parts by weight of the mixture.
In this production method, when the blended amount of the modified ethylene polymer (B) is less than 0.1 parts by weight, the effect of improving the melt tension becomes small. On the other hand, when it exceeds 30 weight part, a gel part will be by-produced.
[0036]
When manufactured in this way, the reaction (formation reaction of the component expressing the melt tension) of the modified ethylene polymer (B) and the silane coupling agent (C) is carried out in the unmodified ethylene polymer (A). It will be. Thereby, generation | occurrence | production of the gel which becomes a cause of the thread break at the time of melt tension measurement can be suppressed. In addition, components effective for improving the melt tension can be uniformly dispersed in the unmodified ethylene polymer (A).
[0037]
Since the composition of the present invention has high melt tension, the moldability of the ethylene polymer can be greatly improved. The composition of the present invention can be molded by sheet molding, film molding, thermoforming, foam molding, blow molding and other molding methods. However, since the melt tension is insufficient, conventional ethylene polymers This is effective when blow molding or foam sheet molding, which has been difficult to mold, is performed.
Such a composition of the present invention is very versatile because it can be easily produced by an existing production apparatus. In addition, since the required amount of the relatively expensive organosilicon compound is small, it is economical in terms of manufacturing cost.
The molded product of the composition of the present invention can be used for various general purpose trays, automobile interior materials and the like.
[0038]
【Example】
Examples of the present invention will be described below, but the present invention is not limited to these examples.
In addition, the measuring method of various parameters is as follows.
(1) Intrinsic viscosity [η]: The polymer was dissolved in decalin and measured at 135 ° C.
(2) Content of polar base part derived from maleic anhydride (modification rate): determined by the above method.
(3) Melt flow ratio (MI): Measured using an orifice having a length of 8 mm and a diameter of 2.095 mm at a resin temperature of 190 ° C. and a load of 2.16 kg.
(4) Melt tension (MT): Measurement was performed using an orifice having a length of 8 mm and a diameter of 2.095 mm at a resin temperature of 190 ° C. and a take-up speed of 3.1 m / min.
(5) Molecular weight distribution (Mw / Mn): Measured by gel permeation chromatograph (GPC) method.
[0039]
Production Example 1
[Production of unmodified ethylene polymer mixture]
Low density polyethylene (unmodified ethylene polymer, MI: 2.1 g / 10 min, density: 0.916 g / cm^Three, Moretech 0238CN (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.): 600 g, 3-aminopropyltriethoxysilane (silane coupling agent, APTES): 1.8 g was added and thoroughly blended. This blend was melt kneaded at 230 ° C. using a 20 mm twin screw extruder. Thus, pellets of an unmodified ethylene polymer mixture containing 3,000 ppm of APTES were produced. In this pellet, as an additive, Irganox 1010 (trade name, phenolic antioxidant, manufactured by Ciba Specialty Chemicals): 1,250 ppm, Irgaphos 168 (trade name, phosphorous antioxidant) , Manufactured by Ciba Specialty Chemicals): 800 ppm, and calcium stearate: 650 ppm.
[0040]
Production Example 2
[Synthesis of maleic anhydride-modified ethylene polymer]
To 400 g of low-density polyethylene used in Production Example 1, 4.0 g of maleic anhydride (MAH) and 0.1 g of perhexine 25B / 40 (trade name, radical initiator, manufactured by Kayaku Akzo) were dry blended, Using a 20 mm twin screw extruder, it was melt-kneaded at 180 degrees to obtain maleic anhydride-modified ethylene polymer pellets. The modification rate of this polymer was 0.95 wt%, and [η] was 2.42 dl / g.
[0041]
Production Example 3
[Production of unmodified ethylene polymer mixture]
In Production Example 1, pellets of an unmodified ethylene polymer mixture were produced in the same manner as Production Example 1 except that the amount of APTES was changed from 1.8 g to 0.6 g.
[0042]
Production Example 4
[Production of unmodified ethylene polymer mixture]
In Production Example 1, pellets of an unmodified ethylene polymer mixture were produced in the same manner as in Production Example 1 except that the amount of APTES was changed from 1.8 g to 3.0 g.
[0043]
Production Example 5
[Synthesis of maleic anhydride-modified ethylene polymer]
In Production Example 2, the same manner as in Production Example 2 except that the blending amount of maleic anhydride was changed from 4.0 g to 2.0 g and the blending amount of perhexine 25B / 40 was changed from 0.1 g to 0.08 g. Maleic anhydride-modified ethylene polymer pellets were obtained. The modification rate of this polymer was 0.51 wt%, and [η] was 2.35 dl / g.
[0044]
Production Example 6
[Synthesis of maleic anhydride-modified ethylene polymer]
In Production Example 2, except that the amount of maleic anhydride was changed from 4.0 g to 1.0 g and the amount of Perhexine 25B / 40 was changed from 0.1 g to 0.08 g, respectively, Maleic anhydride-modified ethylene polymer pellets were obtained. The modification rate of this polymer was 0.23 wt%, and [η] was 2.38 dl / g.
[0045]
Production Example 7
[Production of unmodified ethylene polymer mixture]
In Production Example 1, as an unmodified ethylene polymer, LLDPE (MI: 3.3 g / 10 min, density: 0.907 g / cm^ThreeIn addition, pellets of an unmodified ethylene polymer mixture were produced in the same manner as in Production Example 1 except that Moretec 0398CN (trade name), manufactured by Idemitsu Petrochemical Co., Ltd. was used.
[0046]
Production Example 8
[Production of unmodified ethylene polymer mixture]
In Production Example 1, as an unmodified ethylene polymer, LLDPE (ethylene-1-octene copolymer, Mw / Mn: 2.5, MI: 5.4 g / 10 min, density: 0.924 g / cm^Three) Was used in the same manner as in Production Example 1 to produce pellets of unmodified ethylene polymer mixture.
[0047]
Production Example 9
[Production of unmodified ethylene polymer mixture]
In Production Example 1, pellets of an unmodified ethylene polymer mixture were produced in the same manner as Production Example 1 except that APTES was not added.
[0048]
Example 1
380 g of the unmodified ethylene polymer mixture pellets of Production Example 1 and 20 g of maleic anhydride-modified ethylene polymer pellets of Production Example 2 were kneaded and melt-kneaded at 230 ° C. using a 20 mm twin screw extruder. Thus, an ethylene polymer composition was obtained. The physical property values of this composition are shown in Table 1.
[0049]
Example 2
In Example 1, an ethylene polymer composition was used in the same manner as in Example 1 except that the pellet of the unmodified ethylene polymer mixture of Production Example 1 was used instead of the pellet of the unmodified ethylene polymer mixture of Production Example 1. I got a thing. The physical property values are shown in Table 1.
[0050]
Example 3
In Example 1, an ethylene polymer composition was used in the same manner as in Example 1 except that the pellet of the unmodified ethylene polymer mixture of Production Example 1 was used instead of the pellet of the unmodified ethylene polymer mixture of Production Example 1. I got a thing. The physical property values are shown in Table 1.
[0051]
Example 4
In Example 1, the ethylene polymer composition was the same as in Example 1 except that the blending amount of the pellets of the unmodified ethylene polymer mixture was 360 g and the blending amount of the maleic anhydride-modified ethylene polymer pellets was 40 g. I got a thing. The physical property values are shown in Table 1.
[0052]
Example 5
In Example 1, the ethylene polymer composition was the same as in Example 1 except that the blending amount of the pellets of the unmodified ethylene polymer mixture was 350 g and the blending amount of the maleic anhydride-modified ethylene polymer pellets was 50 g. I got a thing. The physical property values are shown in Table 1.
[0053]
Example 6
In Example 1, instead of the maleic anhydride modified ethylene polymer pellets of Production Example 2, the maleic anhydride modified ethylene polymer pellets of Production Example 5 were used in the same manner as in Example 1 except that A coalescence composition was obtained. The physical property values are shown in Table 1.
[0054]
Example 7
In Example 1, instead of the maleic anhydride modified ethylene polymer pellets of Production Example 2, the maleic anhydride modified ethylene polymer pellets of Production Example 6 were used in the same manner as in Example 1 except that A coalescence composition was obtained. The physical property values are shown in Table 1.
[0055]
Example 8
In Example 1, an ethylene polymer composition was used in the same manner as in Example 1 except that the pellet of the unmodified ethylene polymer mixture of Production Example 1 was used instead of the pellet of the unmodified ethylene polymer mixture of Production Example 1. I got a thing. The physical property values are shown in Table 1.
[0056]
Example 9
In Example 1, an ethylene polymer composition was used in the same manner as in Example 1, except that the pellet of the unmodified ethylene polymer mixture of Production Example 8 was used instead of the pellet of the unmodified ethylene polymer mixture of Production Example 1. I got a thing. The physical property values are shown in Table 1.
[0057]
Comparative Example 1
In Example 1, an ethylene polymer composition was used in the same manner as in Example 1 except that the pellet of the unmodified ethylene polymer mixture of Production Example 1 was used instead of the pellet of the unmodified ethylene polymer mixture of Production Example 1. I got a thing. The physical property values are shown in Table 1.
[0058]
Comparative Example 2
In Example 1, an ethylene polymer composition was obtained in the same manner as in Example 1 except that the maleic anhydride-modified ethylene polymer was not used. The physical property values are shown in Table 1.
[0059]
[Table 1]

[0060]
【The invention's effect】
According to the present invention, an ethylene polymer composition having a high melt tension and an excellent balance between melt tension and fluidity and a method for producing the same can be provided.

Claims (6)

The silane coupling agent (C) and the following unmodified ethylene polymer (A) are mixed so that the silane coupling agent (C) is contained at 10 to 10,000 ppm,
A method for producing an ethylene polymer composition containing 1 to 2,000 ppm of a polar base, comprising mixing 0.1 to 30 parts by weight of the following modified ethylene polymer (B) with respect to 100 parts by weight of the mixture. .
(A) an unmodified ethylene polymer having a melt flow ratio of 0.01 to 100 g / 10 min and a density of 0.890 to 0.970 g / cm ³ (B) an ethylenic double bond and a polar group Modified ethylene polymer containing 0.001 to 1% by weight of a polar base derived from a compound contained in the same molecule and having an intrinsic viscosity of 0.7 to 5.0 dl / g The method for producing an ethylene polymer composition according to claim 1, wherein the modified ethylene polymer (B) satisfies the following (1) to (3).
(1) Molecular weight distribution (Mw / Mn) is 2-6
(2) Density is 0.890-0.970 g / cm ³
(3) The molar ratio of the polar base to the polymer chain is 0.8-2. 3. The ethylene polymer composition according to claim 1, wherein the melt tension (MT) and the melt flow ratio (MI) of the ethylene polymer composition satisfy a relationship of MT / (MI) ^−0.8 > 7 . Manufacturing method . The method for producing an ethylene-based polymer composition according to any one of claims 1 to 3, wherein the compound containing the ethylenic double bond and the polar group in the same molecule is an unsaturated carboxylic acid and / or an anhydride thereof. The method for producing an ethylene polymer composition according to any one of claims 1 to 4, wherein the silane coupling agent (C) is an organosilicon compound represented by the following general formula (1).
X _n SiY _m (OR) _{4- (n + m)} (1)
Wherein X is a substituent containing a functional group capable of reacting with the polar group, Y is a hydrogen atom, a halogen atom or a hydrocarbon group, R is a hydrocarbon group, and n is 1, 2 or 3, m is 0, 1 or 2, and (n + m) is 1, 2 or 3. ] 6. The method for producing an ethylene polymer composition according to claim 5 , wherein X in the general formula (1) is a substituent containing an amino group.