JP2002523542A - Blends comprising linear low density polyethylene, high density polyethylene and low density polyethylene, particularly suitable for extrusion coating and film - Google Patents

Abstract

(57) Abstract A novel composition comprising at least three different polyethylene-based components is provided. The blend includes linear low density polyethylene, high density polyethylene and low density polyethylene. The composition can be used for other applications such as extrusion coating, production of films including cast and inflation, and lamination.

Description

DETAILED DESCRIPTION OF THE INVENTION

FIELD OF THE INVENTION The present invention relates to compositions particularly useful for extrusion coating, comprising a blend of at least three polyethylene components, to methods of using such blends for extrusion coating, and to composites produced thereby. . The present invention also relates to films made from the blends.

Prior art polyolefin blends containing linear low density polyethylene as a background component are useful in certain extrusion coating applications. One such prior art blend is Dow Chemical's Dowlex 3010 linear low density polyethylene, which contains at least 80% by weight linear low density polyethylene. Examples of extrusion coating applications include structures such as flexible polymer film / paper food packaging and vapor-deposited polymer film balloons. The linear low density polyethylene component in the previous blend has strong heat sealability (with the coating of the coating);
Strong tensile properties of the coating; Strong tear resistance of the coating; High dart impact strength of the coating
imparts the fracture resistance of the coating; and the stress crack resistance of the coating. These properties are generally not achievable with polyolefin blends that do not contain linear low density polyethylene. However, these prior art blends containing linear low density polyethylene present certain processing undesirables.

[0003] Prior art blends containing high levels of, for example, 80% by weight or more linear low density polyethylene, typically provide excessive power (extruder motor driven watts) for extrusion during extrusion coating operations. I need. Frequently, the production speed of the extrusion coating operation must be reduced so as not to exceed the limits of the extruder drive motor. In many cases, productivity is very low, resulting in economic losses.

In addition, prior art blends containing high levels of linear low density polyethylene, for example, 80% or more by weight, generally have excessive neck-in (neo) of the melt extrudate.
excessive extrudate edge bead exhibited by ck-in
). This is a problem already known to those skilled in the art of extrusion coating. Excessive edge beads must be cut off and discarded as scrap. Otherwise, the final coating structure does not show a uniform thickness.

It is clearly desirable in extrusion coating operations to use a polyolefin composition that includes linear low density polyethylene as a component and is extruded with significantly lower power requirements and with significantly less edge beads. Is clear. For the same polyolefin composition comprising linear low density polyethylene as a component, maintaining the desired coating properties exhibited by prior art binary polyolefin blends comprising linear low density polyethylene as the major component of the two components. Would also be desirable. These properties include: strong heat sealability (between the coating and the coating); strong tensile properties of the coating; strong tear resistance of the coating; high dart impact strength of the coating; breaking resistance of the coating; Includes cracking.

[0006] SUMMARY The present inventors of the invention, unexpectedly, linear low density polyethylene, comprising a blend of high density polyethylene and low density polyethylene, have found extrusion coated polyolefin composition improved. The compositions of the present invention are desirably extruded at lower power requirements (extruder driven motor watts) than prior art binary polyolefin blends including linear low density polyethylene. This is true even though the compositions of the present invention require considerably more heat energy per unit mass for melting than is required by prior art formulations. The compositions of the present invention exhibit significantly less neck-in (less than edge beads) than exhibited by the prior art compositions.

[0007] The composition according to the invention is a polyolefin blend comprising at least the following three components: The first component generally has a heat-sealing strength between the coating and the coating,
It is a linear low density polyethylene that provides toughness, tear resistance and fracture resistance. In general, their properties are essentially equivalent to those exhibited by the prior art compositions. The second component is generally a high density polyethylene copolymer that provides properties such as tensile strength and stress crack resistance. Their properties are generally the same as those exhibited by the prior art compositions. The third component is a low density polyethylene homopolymer that typically contributes to reducing edge beads by causing less net-in in the melt extrudate. Usually, this neck-in property is superior to prior art compositions. Moreover, this third component also usually provides for good adhesion of the coating to the substrate,
The blend provides good wettability to the substrate surface to be coated. Thus, the present invention, which contains less linear low-density polyethylene than prior art compositions, does not impair the coating properties that would normally be expected by reducing the content of linear low-density polyethylene. Used.

[0008] The present invention also relates to an improved extrusion coating method comprising using said composition consisting of at least linear low density polyethylene, high density polyethylene and low density polyethylene. Furthermore, the present invention also relates to a coated article or composite material comprising a substrate, with or without primer, on which the composition is coated, preferably by an extrusion coating method. The primer used for imparting adhesion to the substrate is preferably a water-soluble primer, and more preferably a polyethyleneimine primer. Furthermore, the present invention uses a layer of the above three component composition between two similar or dissimilar substrates, optionally including a primer layer between the polyethylene blend and each substrate. Including laminates. The resulting composite or laminate can be formed into an article such as a food packaging having good barrier properties (ie, the packaging is typically impermeable to liquids and gases). . The invention also relates to films produced from the novel compositions, in particular by cast or blown film technology.

It is therefore an object of the present invention to provide a novel composition comprising at least a blend of linear low density polyethylene, high density polyethylene and low density polyethylene. It is another object of the present invention to provide an improved extrusion coating method wherein a novel composition comprising the inventive blend as defined herein is utilized as an extrusion coating.

It is a further object of the present invention to provide a coated substrate or composite, wherein the coating composition comprises a novel blend of the present invention as defined herein. It is a still further object of the present invention to provide a coated substrate or composite wherein a coating composition comprising the novel blend of the present invention has been applied onto the substrate by an extrusion coating process. These and other objects of the invention will be apparent to those skilled in the art from the following detailed description, preferred embodiments, examples, and claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS . 1 and 2 illustrate the use of differential scanning calorimetry (DSC) to determine the melting point distribution, especially the maximum melting point, and the thermal energy per unit mass required to melt that mass. Obtained by measurement.

[0012] DETAILED DESCRIPTION The novel compositions of the present invention invention include linear low density polyethylene, a blend of high density polyethylene and low density polyethylene. The linear low density polyethylene component of the blend is generally known to impart heat seal strength, toughness, tear and fracture resistance to the extruded coating.
Linear low density polyethylene component of the composition is a low density polyethylene copolymer comprising ethylene C ₃ -C ₁₀ alpha-olefin comonomer. The α-olefin comonomer is preferably a C ₆ -C ₈ α-olefin, more preferably ethylene-
Hexene or ethylene-octene copolymer. The α-olefin comonomer is present in an amount from about 5% to about 12% by weight of the ethylene-α-olefin copolymer,
More preferably, it is present in an amount of about 7 to about 10% by weight. The ethylene-α-olefin copolymer component further has a melt index value of about 0.5 dg /
Min to about 10 dg / min, more preferably about 1 dg / min to about 3 dg / min, most preferably about 2 dg / min; expansion ratio of about 1.0 to about 1.2; annealing density of about 0.90 g / cc to about 0.
93 g / cc; and a polydispersity coefficient of about 1 to about 4. The ethylene-α-olefin linear low density copolymer can be made by any method known in the art, for example, as described in US Pat. No. 4,339,507.

[0013] The linear low density ethylene copolymer component of the blend of the present invention is present in an amount of about 25 to about 40% by weight, more preferably in an amount of about 30 to about 35% by weight, based on the weight of the blend.
Most preferably it is present in an amount of about 33% by weight per weight of the blend.

The high density polyethylene component of the blend is generally known to impart tensile strength and stress crack resistance to the blends of the present invention. The high density polyethylene component of the novel composition is a homopolymer of ethylene or a copolymer of ethylene and an α-olefin comonomer. The α-olefin comonomer preferably has about 3 to about 10 carbon atoms. The α-olefin comonomer comprises from about 0.2 to about 1 of the copolymer.
%, More preferably in an amount of about 0.4 to about 0.7% by weight, even more preferably in an amount of about 0.5% by weight per copolymer weight. The preferred comonomer is hexene. The high density polyethylene component further comprises an annealing density of at least 0.940 g / cc to about 0.97 g / cc, more preferably from about 0.95 g / cc to about 0.97 / cc; Min to about 20dg /
Min, more preferably about 14 dg / min to about 18 dg / min, particularly preferably about 16 dg / min. The high density polyethylene component can be made by any method known in the art, for example, as described in US Pat. No. 4,339,507. The high density polyethylene component of the blends of the present invention comprises from about 25 to about 25% by weight of the blend.
It is present in an amount of about 40% by weight, more preferably in an amount of about 30 to about 35% by weight, particularly preferably in an amount of about 33% by weight, based on the weight of the blend.

[0015] The low density polyethylene component of the blends of the present invention typically imparts good wettability to the substrate so as to adhere well to the substrate. The low density polyethylene component of the novel composition is a polyethylene with a broad molecular weight distribution, as indicated by having a polydispersity coefficient greater than 9 to about 12. The low density polyethylene further has a melt index value measured at 190 ° C. of about 3 dg / min to about 40 dg / min, more preferably about 6 dg / min to about 30 dg / min, even more preferably about 18 dg / min to about 22 dg / min. Min, most preferably about 20 dg / min. Low density polyethylene is further characterized by having an anneal density of about 0.90 g / cc to about 0.93 g / cc.

The low density polyethylene component of the blend of the present invention comprises from about 25 to about 25 per weight of the blend.
It is present in an amount of about 40% by weight, more preferably in an amount of about 30 to about 35% by weight, particularly preferably in an amount of about 33% by weight, based on the weight of the blend.

The novel compositions of the present invention can be manufactured by any method known in the art. For example, the composition is mixed by dry blending or tumbling in any conventional equipment, or in any optional mixing equipment, such as single and twin screw extruders, Werner Pfleiderer mixers, Banbury mixers, and the like. It can be manufactured by the following.

As will become apparent below, it has been found that extruding the compositions of the present invention requires less power than prior art blends. This was completely unexpected as the novel compositions of the present invention require more heat energy to melt than the amount required to melt the prior art blend.

The substrate to which the blend of the invention is applied is preferably a primer substrate. The primer is preferably a water-soluble primer. More preferably, the substrate is primed with polyethyleneimine. After application of the primer, the primed surface is then extrusion coated with the blend. The polyethyleneimine used to prime various substrates extrusion coated with the blends of the present invention is most preferably AICA-131-X polyethyleneimine primer from MICA Corporation. Extrusion coating methods are known in the art. One skilled in the art can readily extrude or extrude the composition of the present invention onto a primed or unprimed surface to produce a composite or laminate.

The compositions of the present invention can be extrusion coated on a substrate or can be extrusion laminated between two substrates. The means and methods of extrusion coating and extrusion lamination are known in the art, and it is anticipated that any of such methods can be utilized in the present invention. It is also possible to co-extrude the novel composition into a structure consisting of at least one or more substrates. The lamination method further includes the step of producing a film from the composition of the present invention. The film may be, for example, a cast film or a blown film. Those skilled in the art will be familiar with the methods available in the art for making films from the blends of the present invention. Many methods are known in the art for producing films using cast or blown film technology.

The substrate on which the blend of the present invention is coated or laminated can be any substrate that normally coats a polyolefin. Examples of suitable substrates include, but are not limited to, coated (eg, clay-coated) or uncoated paper or paperboard (printed or unprinted), metal foil, plastic film, and the like. These surfaces may or may not be provided with a primer, but a surface provided with a primer is preferred.

The laminate according to the invention comprises two substrates having the composition according to the invention between them, each substrate independently having a surface on the side facing the other substrate. A primer may or may not be applied. In such a laminate, the substrate may be similar or dissimilar. For example, both substrates may be paper, or one substrate may be paper and the other substrate may be a polymer film.

A person skilled in the art can easily determine the optimum conditions for coating or lamination. Films may be made from the novel compositions of the present invention by any known technique.
Preferred herein are cast or blown film techniques, both of which are known in the art. The composition of the present invention should include other compounding ingredients, such as additional polyethylene components, fillers, lubricants, tackifiers, pigments, etc., as known in the art, so long as the composition is not adversely affected. Can be.

The present invention will be more readily understood by reference to the following examples. Of course, given the complete disclosure of the present invention, there are many other forms of the present invention that will be apparent to those skilled in the art, so these examples are provided for illustrative purposes only, and It should be recognized that they should not be construed as limiting the scope of the invention.

In the following examples, the test procedures listed below were used to evaluate the analytical properties of the polyethylene here and the physical properties of the example compositions. The melt index (dg / min) is 19 according to ASTM D1238-62T.
Determined at 0 ° C. The swell ratio is defined as the ratio of the extrudate to the orifice diameter of an extrusion plastometer in ASTM D1238-62T. The diameter of the coupon is measured in the area between 0.159 cm and 0.952 cm of the first part of the coupon as it emerges from the extrusion plastometer. The measurement was performed by a standard method according to ASTM D374.

The annealing density (g / cc) was determined according to ASTM D1505. The polydispersity coefficient is a ratio of the weight average molecular weight Mw to the number average molecular weight Mn. M
w and Mn were obtained by size exclusion chromatography on a Waters 150C gel permeation chromatograph equipped with a standard refractometer detector and Viscotek 150R differential viscometer instrument. The three column sets are Waters 10 ³ ,
10 ⁴ and linear mixed beds (10 ³ , 10 ⁴ and 10 ⁵ ) Micro-Styrag
el HT column. The sample was run at 140 ° C. as a 0.125% w / v o-dichlorobenzene solution. Data is Viscotek Unic
al software (V4.02), NB on any polyethylene sample
Judgment was made by a universal test using S 1475 (linear polyethylene) and NBS 1476 (branched polyethylene).

The maximum melting point (° C.) of differential scanning calorimetry and the energy required to melt a given mass of polyolefin are described in J. Am. / G and determined according to ASTM D3418. Neck-in (in / edge or cm / edge) was determined by first measuring the width W of the extrusion coating on the substrate and then subtracting that measurement from the width D of the extrusion coating die. The difference (D-W) is then divided by 2 (i.e., (D-W) / 2) and the result is the extruded neck-in per edge value.

[0028] The ultimate heat seal strength (gf) is determined by a Theller Model HT tack healer as described in US Patent No. 5,331,858.
at sealer). Tensile properties, ie, tensile strength at break and tensile strength at yield, both expressed in lb / in ² (or MPa); and elongation at break, expressed in%, were determined according to ASTM D882. Tensile strength is expressed in gf or mN and determined according to ASTM D1992. The dart impact strength (g / 50% failure) was determined according to ASTM D1709A. Break resistance (lb / mil) was determined according to ASTM D4649. Stress cracking (time / 50% failure) (F ₅₀ ) was determined according to ASTM D1693-94.

Example 1 (Comparative) The composition used in this example is a blend of about 80% by weight of an ethylene-octene copolymer containing about 7 to about 10% by weight of octene and about 20% by weight of low density polyethylene. Seems like Do from Dow Chemical Company
wlex 3010 polyethylene. Further, the blend had a melt index at 5.8 ° C. of 5.8 dg / min and an anneal density of 0.922 g / cc.

The pellets of the Dowlex 3010 blend were tested using differential scanning calorimetry to determine the melting point distribution, particularly the highest melting point, and the thermal energy per unit mass required to melt the mass. The melting point distribution and calorimetric data obtained for the Dowlex 3010 blend are shown in FIG.

The Dowlex 3010 blend is prepared in a manner known to those skilled in the art using a 40 lb. Extrusion coated on natural kraft paper. The Dowlex 3010 blend has barrel heater settings of 397 ° F (203 ° C), 500 ° F (260 ° C), 600 ° F (315 ° C).
) And 645 ° F. (340 ° C.) from a 3.5 inch diameter extruder.
317 ° C.). Die extrusion rate is 10lb per die width
. / In / hour (1.8 kg / cm / hour). Dow with constant die extrusion
The extruder power, measured in% motor load and kW, required to extrude the lex 3010 blend is shown in Table I. The energy required to melt a given mass of the Dowlex 3010 blend, as well as the maximum melting point of the Dowlex 3010 blend, are also shown in Table I.

Example 2 A composition of the present invention was made by dry blending the following ingredients: (a) CM 2705 from Eastman Chemical Company
33% by weight of 7-F linear low density polyethylene, based on the weight of the composition. The linear low density polyethylene contains about 8% by weight of hexene, a melt index at 190 ° C. of about 2.0 dg / min, an anneal density of about 0.910 g / cc, an expansion coefficient of about 1.2, and a polydispersity coefficient of about 3 Is an ethylene-hexene copolymer having

(B) HT 7011 from Eastman Chemical Company
-33% by weight of X high density polyethylene, based on the weight of the composition. High density polyethylene contains about 0.7% by weight hexene and has a melt index of 1 at 190 ° C.
An ethylene-hexene copolymer having an annealing density of 0.96 g / cc, 6 dg / min;

(C) 33% by weight of Eastman Chemical Company's 811A low density polyethylene, based on the weight of the composition. Low density polyethylene is
A melt index of about 20 dg / min at 190 ° C. and an annealing density of about 0.92 g
/ Cc is an ethylene homopolymer. The low density polyethylene is further characterized as having a broad molecular weight distribution, as indicated by a polydispersity coefficient of about 10.

The resulting ternary blend, which is a typical composition of the present invention, is characterized by having a melt index at 190 ° C. of about 5.5 dg / min and an anneal density of about 0.922 g / cc.

Pellets of the composition of this example were tested using differential scanning calorimetry to determine their melting point distribution, in particular the highest melting point of the blend, and the unit mass of the composition required to melt its mass. The heat energy per hit was measured. The melting point distribution and calorimetric data for the blend of this example are shown in FIG.

The resulting blend of this example is 40 lb. Extrusion coated on kraft paper. This blend is available at barrel heater settings of 398 ° F (203 ° C), 499 ° F (259 ° C).
The kraft paper was coated from a 3.5 inch diameter extruder at 600 ° F (315 ° C) and 639 ° F (338 ° C) at a melt temperature of 596 ° F (313 ° C). The screw of the extruder was a single screw type having a compression ratio of 3.5: 1, and a uniform output was supplied through a die. The die output was kept constant at 10 lb / in / hr (1.8 kg / cm / hr) over the die width. % Motor load required to extrude the blend of Example 2
And the extruder power measured in kW is reported in Table I for that constant die output. Similarly, Table I reports the maximum melting point of the blend of Example 2 as well as the energy required to melt a given mass of the blend.

[0038]

[Table 1]

The following findings are possible from the data in Table I: The new composition of Example 2 is typical of the present invention, but can be extruded with lower extruder drive motor loading than required in the prior art blend of Example 1. In this example, the reduction in load on the extruder drive motor is 12%.

Further, the blend of Example 2 can be extruded using less extruder drive motor power than required in the prior art blend of Example 1. The reduction in extruder drive motor power here is 12%. Reducing the extruder drive motor power allows the extrusion coating operation to produce articles with greater latitude at the required powers where the maximum load on the drive motor does not exceed the limit.

The reduction in power requirements associated with the use of the compositions of the present invention is shown in Table I.
Indicate that the energy required to melt a given mass of the composition of Example 2 is 15% greater than that required to melt the mass of the blend of Example 1 (prior art blend). That's quite surprising. Based on the difference in heat energy required to melt the blends of Examples 1 and 2, the opposite result, ie, the composition of the present invention represented by the blend of Example 2, gives the prior art blend of Example 1 The power requirements would have been greater when comparing.

Example 3 (Comparative) In this example, the same composition as in Example 1, ie, Dow Che
The Dowlex 3010 blend from medical Company was used. Do
The wlex 3010 blend is 40 lb. Extrusion coated on kraft paper. Dole
x 3010 blend at 397 ° F (203 ° C) with barrel heater setting, 500
2. F. (260 ° C.), 600 ° F. (315 ° C.) and 645 ° F. (340 ° C.).
It was applied to kraft paper from a 5 inch diameter extruder at a melt temperature of 601 ° F (317 ° C).
The die output was kept constant at 10 lb / in / hr (1.8 kg / cm / hr) over the die width. Air gap to die nip is 5.25in. (6.4 cm). Samples of coated kraft paper were 600 fpm (185 m / min) and 1000 fpm (305
m / min) and neck-in measurements of the prior art Dowlex 3010 blend (typical invention) coatings were made for each speed. The results are reported in Table II.

Example 4 Here, a 40 lb. Extrusion coated on kraft paper. The composition was set at 398 ° F. (203 ° C.), 499 ° F. (2
The kraft paper was coated from a 3.5 inch diameter extruder at 59 ° C), 600 ° F (315 ° C) and 639 ° F (338 ° C) at a melt temperature of 596 ° F (313 ° C). The die output was kept constant at 10 lb / in / hr (1.8 kg / cm / hr) over the die width. Air gap to die nip is 5.25in. (6.4 cm). Coated kraft paper samples were obtained at 600 fpm (185 m / min) and 1000 fpm (305 m / min), and neck-in measurements of the blend of Example 2 (typical invention) were made for each speed. The results are reported in Table II.

[0044]

[Table 2]

Observation of the data in Table II allows the following findings. The composition of the present invention represented by Example 4 provides lower, and therefore better, neck-in values when compared to the prior art blend of Example 3. Lower neck-in values result in a wider extrusion coating and reduce the edge bead of the melt extrudate. Edge beads are usually cut off and discarded as scrap, resulting in economic losses.
Thus, because the compositions of the present invention are characterized by lower neck-in and lower edge beads, less is discarded as edge bead scrap when compared to the use of the prior art blend of Example 3 and economical. Loss is reduced.

Example 5 Here, the same composition as in Example 1, ie, Dow Chemical Comp
Any Dowlex 3010 blend is prepared by known methods at a melt temperature of 60.
Cast to film at 3 ° F. (318 ° C.) and sufficient take-off speed to a thickness of 0.00
A 1 inch (0.0254 mm) film was obtained. The resulting cast film is
Tested for heat seal strength (film / film); tensile properties; tear resistance; dart impact strength; In addition, pellets of the Dowlex 3010 blend were compressed into sheets and tested for stress crack resistance. The results are reported in Table III.

According to the above procedure, the composition of Example 2 was formed into a cast film at a melting temperature of 603 ° F. (318 ° C.) and a sufficient take-off speed, and was formed to a thickness of 0.001 inch (0.0254 mm).
) Was obtained. The resulting cast films were tested for heat seal strength (film / film); tensile properties; tear resistance; dart impact strength; Pellets of the composition of Example 2 were compressed into sheets and tested for stress crack resistance. The results are reported in Table III.

[0048]

[Table 3]

By observing the data in Table III, the film / coating properties obtained using the novel composition of the present invention are substantially similar to those obtained using the prior art blend of Example 1. It becomes clear that

Example 6 Here, the composition of Example 2 was used to make a blown film. Methods for making blown films are known. More specifically, the composition of Example 2 was prepared at 2.5 in (6 in.) With a length to diameter ratio of 24: 1 and 5 heating zones.
. (4 cm) diameter. The annular extrusion die has a diameter of 6in (15.3cm)
And the distance from land to land of the die is 0.088 in (0.22
4 cm). The extrudate temperature was 385 ° F (196 ° C). The extrudate output was 89 lb / hr (41 kg / hr) and the blown film take-off speed was 78 fpm (24 m / min). The expansion ratio of the film was 2.5 and the width 22.
A 5 inch (57 cm), blown tube (a tubular lay flat) with a uniform film thickness of 0.001 inch (0.0254 mm) was obtained. The film obtained from the composition of Example 2 by inflation was of uniform thickness and of excellent overall quality.

From all of the foregoing, it is clear that the novel compositions of the present invention have many uses. For example, the novel compositions can be formed into cast and blown films using any known technique for forming cast or blown films. Further, the novel compositions of the present invention have substantially equivalent film / coating properties as compared to prior art compositions, but have improved processing properties, ie, lower extruder drive motor requirements. With power and lower neck-in, ie, fewer edge beads, it can be used in the manufacture of extruded coatings.

As described above, the present invention has been described in detail with reference to the preferred embodiments. However, variations and modifications other than those explicitly described in the present specification are possible within the spirit and scope of the present invention. It should be understood.

[Brief description of the drawings]

FIG. 1 shows the melting point distribution and related calorimetric data of a prior art binary blend.

FIG. 2 shows the melting point distribution and related calorimetric data for a ternary blend of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 23:00 B29K 23:00 B29L 7:00 B29L 7:00 (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE), CA, JP, KR, MX, RU , Diane Hines United States, Texas 75604-1047, Longview, French drive 3712 F-term (reference) 4F207 AA05 AA08 AA12 AD03 AD05 AD06 AD08 AG03 KA01 KA17 KB13 KB22 KL65 4J002 BB03X BB03Y BB05W BB05X BB15W GF00 A01A01 DA04A01 DA15 DA42

Claims (10)

[Claims] (A) the α-olefin comonomer is present in an amount of from 5 to 12% by weight, based on the weight of the first copolymer, and the first ethylene-α-olefin copolymer has a melt index of 0.5 at 190 ° C. -10 dg / min, expansion ratio 1.0-1
. 2, annealing density 0.90~0.93g / cc and a first copolymer of ethylene and C ₃ -C ₁₀ alpha-olefin comonomer having a polydispersity coefficient 1-4, the composition by weight per 25 to 40 wt% (B) the α-olefin comonomer is present in an amount of 0.2 to 1% by weight based on the weight of the second ethylene-α-olefin copolymer, further comprising a first ethylene homopolymer and a second ethylene-α-olefin copolymer Has an annealing density of at least 0
. 940 g / cc to 0.97 g / cc and melt index at 190 ° C. 6 to 20
dg / min of a first ethylene homopolymer or a second ethylene and C ₃ -C ₁₀ α
25% to 40% by weight of the copolymer with the olefin comonomer per weight of the composition;
And (c) a second homopolymer of ethylene having a polydispersity coefficient of greater than 9 to 12 and a melt index of 3 to 40 dg / min at 190 ° C. and an annealing density of 0.90 to 0.93 g / cc, based on the weight of the composition. 25-40% by weight of a polymer blend composition comprising: 2. The α-olefin comonomer of the first ethylene-α-olefin copolymer has from 6 to 8 carbon atoms and the first ethylene-α-olefin copolymer has a melt index at 190 ° C. of 1 to 3 dg / 2. The composition of claim 1, wherein the composition has 3. The first ethylene homopolymer and the second ethylene-α-olefin copolymer have an anneal density of 0.95 to 0.97 g / cc and a melt index at 190 ° C. of 14 to 18 dg / min. The composition of claim 1. 4. The composition of claim 1 wherein the second ethylene homopolymer has a melt index at 190 ° C. of 18 to 22 dg / min. 5. The composition according to claim 1, wherein (a), (b) and (c) are each 3% by weight of the composition.
The composition of claim 1 which is present from 0 to 35% by weight. 6. A method comprising extrusion coating the composition of claim 1 onto a substrate. 7. An article comprising a substrate and a coating thereon, wherein the coating comprises the composition of claim 1. 8. An article according to claim 7, which is produced by extrusion coating the composition according to claim 1 on said substrate. 9. A film formed from the composition according to claim 1. 10. An article wherein the film formed from the composition according to claim 1 is a component having a multilayer laminated structure.