CN106795344B - Polypropylene resin composition and film made therefrom - Google Patents
Polypropylene resin composition and film made therefrom Download PDFInfo
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- CN106795344B CN106795344B CN201580055808.2A CN201580055808A CN106795344B CN 106795344 B CN106795344 B CN 106795344B CN 201580055808 A CN201580055808 A CN 201580055808A CN 106795344 B CN106795344 B CN 106795344B
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 32
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 32
- -1 Polypropylene Polymers 0.000 title claims abstract description 30
- 239000011342 resin composition Substances 0.000 title claims abstract description 25
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 claims abstract description 20
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims abstract description 15
- 229920001384 propylene homopolymer Polymers 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims description 22
- NNBZCPXTIHJBJL-UHFFFAOYSA-N decalin Chemical compound C1CCCC2CCCCC21 NNBZCPXTIHJBJL-UHFFFAOYSA-N 0.000 claims description 14
- 239000000284 extract Substances 0.000 claims description 13
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 9
- 239000005977 Ethylene Substances 0.000 claims description 9
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 4
- 125000004855 decalinyl group Chemical group C1(CCCC2CCCCC12)* 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 229920006302 stretch film Polymers 0.000 claims 1
- 230000001954 sterilising effect Effects 0.000 abstract description 21
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 21
- 238000004806 packaging method and process Methods 0.000 abstract description 6
- 230000000379 polymerizing effect Effects 0.000 abstract description 6
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 description 11
- 239000005025 cast polypropylene Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/02—Ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Ethene-propene or ethene-propene-diene copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Wrappers (AREA)
Abstract
The present invention relates to a polypropylene resin composition. More particularly, the present invention relates to a polypropylene resin composition which is excellent in impact resistance and heat adhesiveness, particularly, which is less likely to cause orange peel after retort sterilization, has excellent appearance, and is suitable for retort food packaging applications, and to a polypropylene resin composition comprising a propylene homopolymer or an ethylene-propylene random copolymer and an ethylene-propylene block copolymer obtained by polymerizing an ethylene-propylene rubber.
Description
Technical Field
The present invention relates to a polypropylene resin composition. More particularly, the present invention relates to a polypropylene resin composition which is excellent in impact resistance and heat adhesiveness, particularly, which is less likely to cause orange peel after retort sterilization, has excellent appearance, and is suitable for use in retort food (retortfood) packaging, and relates to a polypropylene resin composition comprising a propylene homopolymer and an ethylene-propylene block copolymer obtained by polymerizing an ethylene-propylene rubber.
Background
The retort food package, in which food is packaged and then sterilized to be stored at normal or low temperature for a long time, is a widely used packaging technique because it is simple and convenient to handle, occupies a small space, and requires a low cost for a packaging material, as compared with the conventional glass or metal can.
The retort container mainly sterilized at 120 to 135 ℃ is used in a multilayer form by bonding polypropylene, polyester, nylon film, metal foil and the like, and is formed of a structure of polyester/nylon/metal foil/polypropylene or polyester/metal foil/polypropylene and the like according to the use. Among them, polypropylene is generally processed into a non-oriented cast polypropylene (CPP) film using an ethylene-propylene block copolymer as a heat-adhesive layer on the innermost side.
CPP films are required to have heat resistance due to sterilization at high temperatures, and also to have properties such as impact resistance and heat adhesiveness in order to prevent breakage during food packaging and transportation. In addition, since the appearance of the package should be beautiful, it is necessary to suppress the occurrence of fine unevenness (orange peel) which occurs after sterilization.
In japanese patent 2012-184302A, blending a linear low density-polyethylene (LLDPE) using a metallocene catalyst suppresses the occurrence of orange peel, but the thermal bonding strength is decreased due to the blending of the LLDPE. Therefore, in japanese patent No. 2013-087275A, the rubber component and High Density Polyethylene (HDPE) are additionally mixed at the time of forming a CPP film, and the occurrence of orange peel is suppressed, but the problem of uneven dispersion and increase in cost accompanying the mixing of a large amount of the rubber component and HDPE, and the disadvantage of difficulty in controlling the dispersion phase according to the processing equipment, are caused.
Disclosure of Invention
Technical problem
The invention aims to provide a polypropylene resin composition for films, which can be sterilized at high temperature, has excellent impact resistance and heat bonding property, and has beautiful appearance after sterilization, namely, can inhibit the generation of orange peel.
Another object of the present invention is to provide a film which can be sterilized at high temperature, has excellent impact resistance and heat-adhesive properties, and does not cause orange peel even after sterilization.
Technical scheme
In order to achieve the object of the present invention, the present invention provides a polypropylene resin composition comprising an ethylene-propylene block copolymer obtained by polymerizing 65 to 82 wt% of a propylene homopolymer and 18 to 35 wt% of an ethylene-propylene rubber in a reactor in stages, wherein the ethylene content of the ethylene-propylene rubber is 25 to 50 wt%, the ethylene-propylene rubber is decalin as a solvent, and the intrinsic viscosity of a solvent extract in the ethylene-propylene rubber at 135 ℃ is 1 to 2.5 dl/g.
In order to achieve another object of the present invention, the present invention provides a film made of the polypropylene resin composition of the present invention.
Effects of the invention
The polypropylene resin composition according to the present invention can be used for a heat-bonding layer of retort packaging composed of a plurality of layers, exhibits excellent impact resistance and heat-bonding characteristics, and suppresses the occurrence of orange peel after sterilization, and is thus expected to be suitable for retort packaging applications requiring high-temperature sterilization.
Best mode for carrying out the invention
The present invention will be described in more detail below.
According to an embodiment of the present invention, there is provided a polypropylene resin composition comprising an ethylene-propylene block copolymer obtained by polymerizing (a) 65 to 82% by weight of a propylene homopolymer and (b) 18 to 35% by weight of an ethylene-propylene rubber in a reactor in stages, wherein the ethylene content of the ethylene-propylene rubber is 25 to 50% by weight, and the intrinsic viscosity of a solvent extract of the ethylene-propylene rubber is 1 to 2.5dl/g at 135 ℃ in a decalin solvent.
The polypropylene resin composition according to the present invention has heat resistance suitable for high-temperature sterilization, is excellent in impact resistance and heat adhesion properties, and suppresses orange peel after sterilization, thereby being capable of providing a CPP film having an excellent appearance.
Component (a) A propylene homopolymer
The propylene homopolymer in the component (a) is obtained by separately injecting propylene into a polymerization reactor and polymerizing the propylene. The polymerization method of the polymer is generally known in the art, and is not particularly limited in the present invention.
The component (a) is 65 to 82 wt% in the ethylene-propylene block copolymer. If the content of the component (a) is less than 65% by weight, the crystallinity is lowered, the heat resistance is lowered, and the thermal adhesive strength is lowered. On the other hand, if it exceeds 82% by weight, the impact resistance is lowered, and orange peel is formed after sterilization, which is not preferable.
Component (b) an ethylene-propylene rubber
The component (b) is continuously polymerized in the presence of the component (a) in a subsequent polymerization reaction apparatus after polymerizing the component (a). The polymerization method of the rubber copolymer is a general method known in the art, and is not particularly limited in the present invention.
The component (b) is continuously polymerized in a reactor after the component (a) is polymerized, and a part of the components of the component (a) and the component (b) are propylene chains, are the same, and are uniformly dispersed by virtue of the affinity of the two phases, so that the reduction of the heat bonding property can be minimized, the impact resistance can be improved, and the occurrence of orange peel after sterilization can be inhibited. The component (b) is polymerized in an amount of 18 to 35 wt% based on the ethylene-propylene block copolymer.
In the component (b), the solvent extract preferably has an intrinsic viscosity (decalin solvent) of 1 to 2.5 dl/g. If the intrinsic viscosity is less than 1dl/g, the rubber component is reduced in size, the molecular weight of the rubber component is small, and the impact properties are deteriorated. When the intrinsic viscosity exceeds 2.5dl/g, the rubber component becomes large in size and agglomerates, so that the dispersibility is lowered and orange peel wrinkles occur after sterilization. In addition, when local blocking occurs, local breakage of the bag film may occur after sterilization.
Further, since the dispersion of the rubber occurs due to the difference in viscosity between the component (a) and the component (b), the ratio of the intrinsic viscosity of the solvent-insoluble component in the ethylene-propylene block copolymer to the intrinsic viscosity of the solvent extract in the ethylene-propylene block copolymer { (intrinsic viscosity of the solvent extract)/(intrinsic viscosity of the solvent-insoluble component) } is preferably 0.6 to 1.4. If the ratio of the intrinsic viscosity is less than 0.6, the rubber component is reduced in size and the impact properties are reduced, and if it exceeds 1.4, the rubber component is agglomerated and the dispersibility is reduced.
In the component (b), the ethylene content is preferably 25 to 50% by weight. If the ethylene content is less than 20% by weight, the elasticity of the rubber is reduced and the impact resistance is lowered, and if it exceeds 50% by weight, the compatibility between the component (a) and the component (b) is lowered, and the size of the rubber phase is increased, so that the dispersibility is lowered and orange peel occurs.
The polypropylene resin preferably has a melt index of 1 to 10g/10 min (ASTM D1238, 230 ℃). If the melt index is less than 1g/10 min, the fluidity of the molten resin is lowered, the extrusion load is increased when forming a CPP film, and the productivity is greatly lowered, and if it exceeds 10g/10 min, the viscosity of the molten resin discharged from the die (die) is lowered, the thickness uniformity is lowered when forming a CPP film, and the mechanical strength is lowered due to the low molecular weight, which is not preferable.
The polypropylene resin composition of the present invention may further contain additives and solvents known in the art within a range not impairing the object of the present invention. Specifically, for example, an antioxidant, a nucleating agent, a heat stabilizer, a weather stabilizer, an antistatic agent, a lubricant, a slip additive, a flame retardant, a pigment, a dye, or the like can be used, and preferably, an antioxidant, an ultraviolet absorber, or the like can be added to impart heat resistance and weather resistance. The additive may be contained in an amount that does not impair the object of the present invention, and the content thereof may be appropriately adjusted by a practitioner.
The method for producing the polypropylene resin composition of the present invention is not particularly limited, and a conventionally known method for producing a polypropylene resin composition can be used, or a method of modifying a part of the method for producing the polypropylene resin composition of the present invention can be used in order to achieve the object of the present invention. The components constituting the resin composition are not particularly limited in order, and may be selected and mixed in a desired order, and specifically, for example, they may be prepared by, but not limited to, a method of injecting the above-mentioned components and other additives in desired amounts into a mixer such as a kneader (kneader), roll (roll) or internal mixer (Banbury mixer) or a single-screw/twin-screw extruder, and then kneading the charged raw materials using the above-mentioned mixer.
The present invention provides a film made of the polypropylene resin composition.
The film can be applied to a protective film, a decorative sheet (deco sheet), a retort pouch, and the like of electronic products requiring high precision, such as liquid crystal display devices. Particularly, it can be preferably applied to a retort pouch.
Detailed Description
The present invention will be described in more detail below with reference to examples. However, these examples are provided to illustrate the present invention, and the scope of the present invention is not limited to these examples.
Examples 1 to 2 and comparative examples 1 to 4
From the compositions shown in table 1 below, after the ethylene content in the ethylene-propylene rubber was prepared to 25% by weight, the polymerization amounts in the respective steps were adjusted so that the content ratio of the component (a) to the component (b) was 25% by weight and the intrinsic viscosity ratio became 0.6 when the component (a) was 75% by weight, thereby obtaining ethylene-propylene block copolymers obtained by kneading the components (a) and (b).
In the ethylene-propylene block copolymer obtained in the above-mentioned step, 0.1% by weight of an antioxidant and 0.02% by weight of a neutralizing agent were kneaded, and the kneaded mixture was extruded in a twin-screw extruder to prepare pellets, and then a film having a thickness of 0.07mm was formed by using a usual extrusion film extrusion apparatus. In the case of film formation, the extruder temperature was 230 ℃ and the cooling roll temperature required for film formation was 30 ℃. The physical properties of the film thus formed were evaluated, and the results are shown in table 1.
Examples of the experiments
The experimental procedures used in the present invention are organized as follows.
Method for measuring physical properties
(1) Melt Index (Melt Index)
The measurement was carried out at 230 ℃ under 2.16kg conditions according to ASTM D1238.
(2) Ethylene content
Using an infrared absorption spectrometer (FT-IR) using 720, 730cm-1Characteristic peak, ethylene content was measured.
(3) Intrinsic viscosity
Intrinsic viscosity was measured at 135 ℃ in decalin solution using a viscosity measuring instrument.
The intrinsic viscosity ratio is calculated according to the following.
The solvent extract of the ethylene propylene rubber component (b) represents a component soluble at 150 ℃ in a decalin solvent.
Inherent viscosity ratio (inherent viscosity of solvent extract in ethylene propylene block copolymer) ÷ (inherent viscosity of solvent insoluble component in ethylene propylene block copolymer)
(4) Bending modulus of elasticity
The measurement was carried out according to ASTM D790.
(5) Izod impact Strength
The measurement was carried out at normal and low temperatures (0 ℃ C.) according to ASTM D256.
(6) Heat distortion temperature
The measurement was carried out according to ASTM D648.
(7) Modulus of film
A70 μm film was cut into a width of 15mm and a length of 100mm, and measured at a drawing speed of 300 m/min in UTM.
(8) Dart impact strength
A70 μm film was measured according to ASTM D4226.
(9) Thermal bonding strength
After a polypropylene film (70 μm), an aluminum foil (9 μm), nylon (15 μm) and PET (12 μm) were laminated, the thickness was 2kgf/cm2Was bonded under pressure of (1) for 1 second, and formed into a bag.
After the formed bag was sterilized at 130 ℃ for 20 minutes, the adhesive film before/after the sterilization was cut into a width of 15mm, and the peel strength of the film was measured.
(10) Whether orange peel wrinkle occurs
After sterilization, the appearance of the bag was confirmed to evaluate whether orange peel occurred.
TABLE 1
As shown in table 1, the polypropylene resin of the present invention exhibits excellent mechanical properties such as high Izod impact strength and heat distortion temperature, high film impact strength, and good heat adhesive strength even after sterilization. In addition, no orange peel occurred even in the aspect of appearance, and thus exhibited excellent characteristics.
On the contrary, the polypropylene resin of comparative example 1 has good heat adhesive strength, but the content of the component (b) is low, so that the dart impact strength is greatly reduced, and orange peel is largely generated after sterilization, thereby causing appearance defects. Comparative examples 2 and 3 were good in Izod impact strength and dart impact strength due to the content of component (b), but the intrinsic viscosity and the intrinsic viscosity ratio of the solvent extract were high, so that orange peel occurred after sterilization. In particular, in comparative example 2, the ethylene content of component (b) was high, and the heat bonding strength before and after sterilization was significantly changed. Comparative example 4 had a high content of component (b), and the heat-bond strength after sterilization was less than 5kgf, which was not suitable for commercial use.
Claims (7)
1. A polypropylene resin composition characterized in that,
comprising an ethylene propylene block copolymer polymerized in stages in a reactor from 65 to 82% by weight of a propylene homopolymer and from 18 to 35% by weight of an ethylene propylene rubber, wherein the ethylene propylene rubber is polymerized continuously in the presence of the propylene homopolymer,
the ethylene propylene rubber has an ethylene content of 33 to 50 wt%,
the intrinsic viscosity of the solvent extract in the ethylene-propylene block copolymer at 135 ℃ is 1 to 2.3dl/g in the presence of decalin as a solvent,
an intrinsic viscosity ratio [ intrinsic viscosity of solvent extract/intrinsic viscosity of solvent-insoluble component ] of intrinsic viscosity of solvent extract in the ethylene-propylene block copolymer and intrinsic viscosity of solvent-insoluble component in the ethylene-propylene block copolymer at 135 ℃ of 0.6 to 1.4 in the case where the solvent is decalin.
2. The polypropylene resin composition according to claim 1,
an intrinsic viscosity ratio [ intrinsic viscosity of solvent extract/intrinsic viscosity of solvent-insoluble component ] of intrinsic viscosity of solvent extract/intrinsic viscosity of solvent-insoluble component in the ethylene-propylene block copolymer at 135 ℃ of 0.7 to 1.1 when decalin is used as a solvent.
3. The polypropylene resin composition according to claim 1,
the ethylene propylene block copolymer has a melt index in the range of 1 to 10g/10 min at 230 ℃ under 2.16 kg.
4. The polypropylene resin composition according to claim 3,
the ethylene propylene block copolymer had a melt index of 5g/10 min at 230 ℃ under 2.16 kg.
5. A film produced from the polypropylene resin composition according to any one of claims 1 to 4.
6. The film of claim 5,
the film is a non-stretch film.
7. The film of claim 6,
the film is used for a protective film, a decorative sheet or a retort pouch.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140157223A KR101598715B1 (en) | 2014-11-12 | 2014-11-12 | Polypropylene resin composition and film produced by the same |
| KR10-2014-0157223 | 2014-11-12 | ||
| PCT/KR2015/004206 WO2016076490A1 (en) | 2014-11-12 | 2015-04-28 | Polypropylene resin composition and film prepared therefrom |
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| Publication Number | Publication Date |
|---|---|
| CN106795344A CN106795344A (en) | 2017-05-31 |
| CN106795344B true CN106795344B (en) | 2020-01-14 |
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| CN201580055808.2A Active CN106795344B (en) | 2014-11-12 | 2015-04-28 | Polypropylene resin composition and film made therefrom |
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| Country | Link |
|---|---|
| KR (1) | KR101598715B1 (en) |
| CN (1) | CN106795344B (en) |
| WO (1) | WO2016076490A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101871072B1 (en) * | 2016-12-21 | 2018-06-25 | 한화토탈 주식회사 | Polypropylene resin composition for easy peel film and article produced with the same |
| KR101988156B1 (en) | 2018-01-22 | 2019-06-11 | 한화토탈 주식회사 | Polypropylene Resin for Insulating Power Cables |
| KR102124702B1 (en) | 2018-11-14 | 2020-06-19 | 한화토탈 주식회사 | Polypropylene resin composition with excellent stress-whitening resistance, process for preparing the same, and article molded therefrom |
| KR102590937B1 (en) * | 2018-12-20 | 2023-10-18 | 롯데케미칼 주식회사 | Polypropylene block copolymer resin with excellent thermal adhesiveness and impact resistance |
| KR102223243B1 (en) * | 2019-09-16 | 2021-03-04 | 한화토탈 주식회사 | Polypropylene Resin Composition with Excellent Stress-whitening Resistance and Heat Resistance, Process for Preparing the Same, and Article Molded Therefrom |
| KR102209154B1 (en) | 2019-12-24 | 2021-01-29 | 한화토탈 주식회사 | Polypropylene Resin Composition with Excellent Stress-whitening Resistance, Process for Preparing the Same, and Article Molded Therefrom |
| KR102587753B1 (en) | 2021-08-31 | 2023-10-11 | 한화토탈에너지스 주식회사 | Polypropylene Resin Composition and Article Molded Therefrom |
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| KR101298417B1 (en) * | 2011-05-16 | 2013-08-20 | 삼성토탈 주식회사 | Polypropylene resin with Excellent stress whitening resistance, Impact strength and Transparency and its Film |
| KR101309329B1 (en) * | 2011-06-28 | 2013-10-14 | 삼성토탈 주식회사 | Polypropylene resin for Protective Film |
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- 2014-11-12 KR KR1020140157223A patent/KR101598715B1/en active IP Right Grant
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- 2015-04-28 CN CN201580055808.2A patent/CN106795344B/en active Active
- 2015-04-28 WO PCT/KR2015/004206 patent/WO2016076490A1/en active Application Filing
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| CN1143564A (en) * | 1995-07-24 | 1997-02-26 | 蒙岱尔北美股份有限公司 | Polypropylene blown film |
| CN1653113A (en) * | 2002-05-10 | 2005-08-10 | 昭和电工塑料产品株式会社 | Cast film, process for production thereof, and bags made of the film |
| CN101175796A (en) * | 2005-05-12 | 2008-05-07 | 北方科技有限公司 | Transparent easy tearable film |
Also Published As
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|---|---|
| WO2016076490A1 (en) | 2016-05-19 |
| KR101598715B1 (en) | 2016-02-29 |
| CN106795344A (en) | 2017-05-31 |
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