WO2005026255A1 - ポリプロピレン系樹脂組成物、それからなる発泡成形体およびその製造方法 - Google Patents
ポリプロピレン系樹脂組成物、それからなる発泡成形体およびその製造方法 Download PDFInfo
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- WO2005026255A1 WO2005026255A1 PCT/JP2004/011872 JP2004011872W WO2005026255A1 WO 2005026255 A1 WO2005026255 A1 WO 2005026255A1 JP 2004011872 W JP2004011872 W JP 2004011872W WO 2005026255 A1 WO2005026255 A1 WO 2005026255A1
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
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- 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
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- 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
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- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- 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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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
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- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
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- 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
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L2023/40—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds changing molecular weight
- C08L2023/44—Coupling; Molecular weight increase
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249987—With nonvoid component of specified composition
- Y10T428/249988—Of about the same composition as, and adjacent to, the void-containing component
- Y10T428/249989—Integrally formed skin
Definitions
- the present invention relates to a polypropylene resin composition, a foamed molded article comprising the same, and a method for producing the same.
- the present invention relates to a polypropylene resin composition suitable for injection foam molding, a foam molded article comprising the same, and a method for producing the same.
- injection foam molding for foaming for the purpose of weight reduction, cost reduction, and prevention of warpage and sink mark of a molded article has been conventionally performed.
- polypropylene resin is crystalline and has a low melt tension (melt tension), and foam defects are likely to occur on the surface of the molded product due to the destruction of air bubbles during foaming, and the appearance of silver streaks (or swirl marks) is likely to occur. It was difficult to increase the foaming ratio due to the occurrence of voids in the inside. Further, the rigidity of the obtained molded body was not sufficient because the bubbles were uneven and large.
- a method for improving the foaming property a method has been proposed in which a crosslinking agent—a silane-grafted thermoplastic resin is added to increase the melt tension of a polypropylene-based resin (for example, see Japanese Patent Application Laid-Open No. 61-152574). No., JP-A-7-109372).
- a foam molded article having a high expansion ratio can be obtained by this method, the viscosity at the time of melting is too high, which makes injection molding difficult, and the obtained molded article has poor surface properties.
- HMS-PP High Melt Strength Polypropylene
- HMS-PP High Melt Strength Polypropylene
- HMS-PP exhibiting strain hardening can also be produced by melt-kneading a polypropylene-based resin, an isoprene monomer, and a radical polymerization initiator (Japanese Patent Application Laid-Open No. 9-187874).
- HMS-PP As a base resin for injection foam molding, a foam molded product can be obtained.
- HMS_PP Japanese Patent Application Laid-Open No. 2001-26032.
- the HMS_PP used here has a melt flow rate of only about 4 g for 10 minutes, has low fluidity during melting, and has a mold cavity with a thin portion with a clearance of about 1-2 mm. Had a problem of becoming a short shot.
- HMS-PP (30 g l0 min), which has a high melt flow rate, is also known, but although it shows strain hardening, it has a melt tension of only about 0.3 cN and has a high expansion ratio. It was difficult to get.
- the production of these HMS-PPs uses expensive radiation equipment, the produced HMS-PPs are also expensive, and it is difficult to provide products obtained from them at low cost.
- It also contains a polypropylene resin with a high melt flow rate and a high melt tension mixed with polyethylene having a specific intrinsic viscosity (Japanese Patent Application Laid-Open No. 2003-128854), and a component having a specific intrinsic viscosity by multistage polymerization.
- a method has also been proposed in which a mixture of a polypropylene resin having a high melt tension and a pyrene resin having a high melt flow rate (JP-A-2003-268145) is used for injection foam molding.
- JP-A-2003-268145 a polypropylene-based resin does not show remarkable strain hardening property like the HMS-PP having the long-chain branch, bubbles are generated at a high expansion ratio such that the expansion ratio exceeds 2 times. They tended to break down and have internal voids, failing to meet the needs for high rigidity and light weight.
- An object of the present invention is to provide a polypropylene resin for injection foam molding that has good injection foam moldability and a high expansion ratio, and as a result, a foam molded article having a beautiful appearance, light weight, and excellent rigidity can be obtained at low cost.
- An object of the present invention is to provide a composition, a foamed molded article comprising the composition, and a method for producing the same.
- the present invention relates to (A) a linear polypropylene-based resin having a melt flow rate of 10 g or more and 10 g or less, and a melt tension of 2 cN or less. And (B) a modified poly which has a melt flow rate of at least 0.1 lg ZIO and less than 10 g Z10, a melt tension of at least 5 cN, and a strain hardening property.
- the propylene resin is composed of 5 to 50 parts by weight (the total of the linear polypropylene resin (A) and the modified polypropylene resin (B) is 100 parts by weight).
- the present invention relates to a polypropylene resin composition.
- the modified polypropylene resin (B) is a modified polypropylene resin obtained by melt-mixing a linear polypropylene resin, a radical polymerization initiator, and a conjugated gen compound.
- the present invention relates to the above-mentioned polypropylene resin composition for injection foam molding.
- the second aspect of the present invention relates to a foamed molded article containing the polypropylene resin composition for injection foam molding described above.
- a foamed layer having an average cell diameter of 500 ⁇ or less, and a non-foamed layer having a thickness of 10 ⁇ m or more and 100 ⁇ m ⁇ or less formed on at least one surface of the foamed layer
- a third aspect of the present invention is the foam molding according to the above, wherein the polypropylene resin composition for injection foam molding and a foaming agent are supplied to an injection molding machine, and then injected into a mold and foamed. It relates to a method for producing a body.
- a mold composed of a fixed mold and a movable mold capable of moving forward and backward to an arbitrary position is used, and after the injection is completed, the movable mold is retracted to foam.
- Still another preferred embodiment of the method for producing a foamed molded article described above includes: (A) a melt flow rate in a mold previously pressurized with a gas at a pressure higher than a pressure at which foaming does not occur at a flow front of the molten mixture. 50 to 95 parts by weight of a linear polypropylene resin having a melt tension of 2 cN or less, and a melt flow rate of 0 to 100 g / 100 min. 1 g Zl 0 min.
- melt tension is 5 cN or more
- modified polypropylene resin showing strain hardening 5 to 50 parts by weight
- linear polypropylene Resin (A) and modified polypropylene resin (B) Total relates to a process for the preparation of 1 0 0 parts by weight) polypropylene resin consisting and blowing agent and polypropylene resins foamed molded of the wherein molten mixture injected to the characterized by foam molding of.
- the pressure of pre-pressurizing the mold at the time of injecting the molten mixture is from 0.1 IMPa to 5 MPa, and the polypropylene-based resin foam molding as described above. Body manufacturing method About.
- the polypropylene resin composition for injection foam molding of the present invention has a good flowability at the time of melting and a high melt tension, and thus has good injection foam moldability. Further, such a polypropylene-based resin composition and a foaming agent are supplied to an injection molding machine and melted.
- a gaseous body is used in advance at a pressure higher than a pressure at which foaming does not occur at a flow front of the molten polypropylene-based resin composition.
- a feature of the polypropylene resin composition for injection foam molding of the present invention is that two types of polypropylene resins (A) and (B) having different melt flow rates and melt tensions are used.
- the linear polypropylene resin (A) used in the present invention has a melt flow rate of 10 g / 10 min to 100 g / 10 min, preferably 15 g Z10O min to 50 g / min. It is 10 minutes or less, and the melt tension is 2 cN or less, preferably 1 cN or less. If the melt flow rate and the melt tension are within the above ranges, short shots are not likely to occur in the production of the injection-molded foamed product even when the mold cavity has a thin portion with a clearance of about 1 to 2 mm.
- melt flow rate is the value measured at 230 ° C and under a load of 2.16 kg in accordance with ASTM D-1238. Melt tension is used for measuring melt tension.
- linear polypropylene resin (A) refers to a polypropylene resin having a linear molecular structure, which can be obtained by a usual polymerization method, for example, by using a transition metal compound and an organometallic compound supported on a carrier.
- the resulting catalyst system eg Ziegler-Natta catalyst
- specific examples include propylene homopolymers, block copolymers, and random copolymers, and include crystalline polymers.
- the copolymer of propylene those containing 75% by weight or more of propylene are preferable in that the crystallinity, rigidity, chemical resistance and the like characteristic of the polypropylene resin are maintained.
- ⁇ -olefins that can be copolymerized include ethylene, 1-butene, isobutene, 1-pentene, 3_methyl_1-butene, 1-hexene, 4-methynole — 1_pentene, 3,4-dimethyl-1-butene, ⁇ -olefins having 2 or 4 to 12 carbon atoms, such as 1-heptene, 3-methyl-11-hexene, 1-octene, 1-decene, cyclopentene, novo ⁇ / nene, tetracyclo [6,2, I 1 , 8 , I 3 ' 6 ] — cyclic olefins such as 4-dodecene, 5-methylene-12-norbornene, 5-ethylidene-12-norbornene, 1,4-hexadiene, methinole-1,4-hexadiene, 7 —Gens such as methyl-1,6-octa
- the modified polypropylene resin ( ⁇ ) used in the present invention has a melt flow rate of 0.1 g / 10 min or more and less than 10 gZl 0 min, preferably 0.3 gZ 10 min or more and 5 g / 10 min or less. It has a melt tension of 5 cN or more, preferably 8 cN or more, and shows strain hardening properties.
- the linear polypropylene resin (A ) Good transferability to the mold surface, silver foam is less likely to appear due to less foam breakage at the molten resin flow tip during injection molding, and uniform A foamed molded article with a foaming ratio of 2 times or more, which has fine bubbles and a beautiful surface appearance, can be obtained.
- the effect of the modified polypropylene resin (B) exhibiting the strain hardening property is that silver streaks due to foam breakage at the molten resin flow tip during injection molding do not easily appear and the surface appearance is beautiful. And a foamed molded article having a high expansion ratio of more than 2 times is easily obtained.
- the strain hardening property as used herein is defined as an increase in viscosity with an increase in the stretching strain of the melt, and is usually defined by the method described in Japanese Patent Application Laid-Open No. Sho 62-121704, It can be determined by plotting the relationship between elongational viscosity and time measured by a commercially available rheometer. Further, for example, the strain hardening property can also be determined from the fracture behavior of the molten strand at the time of measuring the melt tension. In other words, when the melt tension sharply increases when the take-up speed is increased, this indicates the case where strain hardening is exhibited.
- modified polypropylene resin (B) examples include a method of irradiating a linear polypropylene resin with radiation or a method of melting and mixing a linear polypropylene resin, a radical polymerization initiator, and a conjugated gen compound. And a modified polypropylene resin containing a high molecular weight component.
- the modified polypropylene resin obtained by melt-mixing a linear polypropylene resin, a radical polymerization initiator and a conjugated gen compound is advantageous in that it does not require expensive radiation irradiation equipment. It is preferable because it can be manufactured at low cost.
- Examples of the raw material polypropylene resin used in the production of the modified polypropylene resin (B) are the same as the linear polypropylene resin (A).
- Examples of the conjugated diene compound include butadiene, isoprene, 1,3-dibutadiene, 2,3-dimethylbutadiene, 2,5-dimethyl-1,2,4-hexadiene, and the like. They may be used in combination. Of these, butadiene and isoprene are particularly preferred because they are inexpensive, easy to handle, and facilitate the reaction to proceed uniformly.
- the addition amount of the conjugated diene compound is as follows: The amount is preferably from 0.01 to 20 parts by weight, more preferably from 0.05 to 5 parts by weight, based on parts by weight. If the amount is less than 0.01 part by weight, it may be difficult to obtain the effect of the modification, and if the amount exceeds 20 parts by weight, the effect may be saturated and the economical effect may not be obtained.
- Monomers copolymerizable with the conjugated diene compound for example, vinyl chloride, vinylidene chloride, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, butyl acetate, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, Metal acrylate, metal methacrylate, methyl acrylate, ethyl acrylate, butynole acrylate, 2-ethylhexyl acrylate, stearyl acrylate, etc., methyl methacrylate, methyl methacrylate, methacrylate A methacrylate such as butyl acrylate, 2-ethylhexyl methacrylate, or stearyl methacrylate may be used in combination.
- Examples of the radical polymerization initiator generally include peroxides and azo compounds.
- a polypropylene resin or a compound having an ability to extract hydrogen from the conjugated gen compound is preferable.
- ketone peroxyside or peroxy compound is preferable.
- Organic peroxides such as xyl ketal, hide mouth peroxide, dialkyl peroxide, disilver oxide, peroxydicarbonate and peroxyester. Among them, those having a particularly high hydrogen abstracting ability are preferable.
- the amount of the radical polymerization initiator to be added is preferably from 0.01 to 10 parts by weight, more preferably from 0.05 to 2 parts by weight, based on 100 parts by weight of the linear polypropylene resin. The following are more preferred. If the amount is less than 0.01 part by weight, the effect of the reforming may be difficult to be obtained, and if the amount exceeds 10 parts by weight, the effect of the reforming may be saturated and not economical.
- Kneaders such as rolls, co-kneaders, Banbury mixers, bravenders, single-screw extruders, and twin-screw extruders are used to react linear polypropylene resin, conjugated gen compounds, and radical polymerization initiators.
- examples include a horizontal stirrer such as a shaft surface renewal machine and a two-shaft multi-disc device, and a vertical stirrer such as a double helical ribbon agitator.
- a kneader is preferably used, and an extruder is particularly preferred in terms of productivity.
- the order and method of mixing, kneading (stirring) and mixing the linear polypropylene resin, the conjugated diene compound, and the radical polymerization initiator are not particularly limited.
- the linear polypropylene-based resin, the conjugated gen compound, and the radical polymerization initiator may be mixed and then melt-kneaded (stirred), or the polypropylene-based resin may be melt-kneaded (stirred) and then mixed with a co-gen compound or a radical initiator. May be mixed simultaneously or separately, collectively or separately.
- the temperature of the kneading (stirring) machine is preferably from 130 to 300 ° C. from the viewpoint that the linear polypropylene resin melts and does not thermally decompose. In general, the time is preferably 1 to 60 minutes.
- modified polypropylene resin (B) used in the present invention can be produced.
- the shape and size of the polypropylene resins (A) and (B) are not limited, and may be pellets.
- a total of 100 parts by weight of the linear polypropylene resin (A) and the modified polypropylene resin (B) is The amount of the linear polypropylene-based resin (A) is 50 to 95 parts by weight, preferably 60 to 90 parts by weight. The amount of the modified polypropylene resin (B) is 5 to 50 parts by weight, preferably 10 to 40 parts by weight.
- the polypropylene resin composition for injection foam molding can be obtained by mixing a linear polypropylene resin (A) and a modified polypropylene resin (B).
- the mixing method is not particularly limited, and can be performed by a known method.For example, dry blending of a pellet-shaped resin using a blender, a mixer, or the like, melt-mixing, melting and mixing with a solvent, etc. Method.
- a method of dry-blending and then subjecting the mixture to injection foam molding is preferable because the heat history is small and the decrease in melt tension is small.
- the foamed molded article of the present invention is a molded article obtained by supplying the polypropylene resin composition for injection foaming molding and a foaming agent to an injection molding machine, and then injecting into a mold to foam molding. .
- the foaming agent that can be used in the present invention is not particularly limited as long as it can be generally used for injection foam molding, such as a chemical foaming agent and a physical foaming agent.
- the chemical foaming agent is supplied to an injection molding machine after being preliminarily mixed with the resin composition, and is decomposed in a cylinder to generate a gas such as carbon dioxide gas.
- the chemical foaming agent include inorganic chemical foaming agents such as sodium bicarbonate and ammonium carbonate, and organic chemical foaming agents such as azodicarbonamide, N, N, -dinitrosopentatetramine. Of these, inorganic chemical foaming agents are preferred because they are usually difficult to color, have little decomposition residue, and are apt to become finer bubbles.
- These inorganic chemical foaming agents include foaming aids such as organic acids such as citric acid, talc, and lithium carbonate, as necessary, in order to stably and uniformly make the cells of the foamed molded product fine.
- a nucleating agent such as inorganic fine particles may be added.
- a masterbatch of a polyolefin resin having a concentration of 10 to 50% by weight is used in terms of handleability, storage stability, and dispersibility in polypropylene resin. It is preferably used as The amount of these inorganic chemical foaming agents varies depending on the type and concentration in the masterbatch.
- the physical foaming agent is injected into the molten resin in the molding machine cylinder as a gaseous or supercritical fluid and dispersed or dissolved.After injection into the mold, the pressure is released, and the physical foaming agent is used as the foaming agent. It works.
- the physical foaming agent include aliphatic hydrocarbons such as propane and butane, alicyclic hydrocarbons such as cyclobutane and cyclopentane, halogenated hydrocarbons such as chlorodifluoromethane and dichloromethane, nitrogen, and carbon dioxide.
- the amount of the physical foaming agent varies depending on the type of the foaming agent and the desired expansion ratio, but is generally preferably 0.05% by weight or more and 10% by weight or less with respect to the polypropylene resin composition of the present invention. Is used in the range of 0.1% by weight to 5% by weight, more preferably in the range of 0.2% by weight to 3% by weight.
- an antioxidant such as a metal deactivator, a phosphorus-based processing stabilizer, an ultraviolet absorber, an ultraviolet stabilizer, a fluorescent brightener, a metal stone test, an antacid, as long as the effects of the present invention are not impaired.
- Additives such as stabilizers such as adsorbents, crosslinking agents, chain transfer agents, nucleating agents, lubricants, plasticizers, fillers, reinforcing materials, pigments, dyes, flame retardants, and antistatic agents may be used in combination. These additives used as needed are, of course, used within a range that does not impair the effects of the present invention, but are generally used in an amount of 100 parts by weight of the polypropylene resin composition of the present invention.
- the injection foam molding method will be specifically described.
- a known method can be applied to the molding method itself, and the molding conditions may be appropriately adjusted according to the MFR of each polypropylene resin, the type of the foaming agent, the type of the molding machine, or the shape of the mold.
- the resin temperature is 170 to 250 ° C
- the mold temperature is 100 to 100 ° C
- the molding cycle is 1 to 60 minutes
- the injection speed is 10 to 30 O mm.
- injection pressure 10 to 200 MPa, and the like.
- the mold is fully filled into the mold to form a non-foamed layer, and by the second injection, the resin that becomes the foamed layer is filled, resulting in a more beautiful appearance and higher foaming ratio. It is more preferable because the rate becomes possible.
- the polypropylene-based resin melt-kneaded material mixed with a foaming agent in a molding machine is supplied with a gas at a pressure higher than a pressure at which foaming does not occur in the flow front of the molten kneaded material. It is more preferable to employ a so-called force center pressure method of injecting into a mold pressed by a body. At this time, it is preferable to maintain the pressure inside the mold when pressurizing, and generally, to prevent gas leakage from the mold, such as by inserting an O-ring etc. in the mold division surface ⁇ sliding part It is desirable to have a structure that does this.
- the gas body for pressurizing the inside of the mold is not particularly limited as long as it can suppress foaming of the molten resin at the flow front by pressurization, but it is inexpensive and easy to handle. Gases, particularly nitrogen and carbon dioxide, are preferred.
- the pressure for pressurizing the mold in advance depends on the type of the polypropylene resin used and the amount of the foaming agent, but is set as low as possible within a range where the surface property improving effect can be obtained in order to simplify the structure of the gas supply device. Is preferred.
- a high expansion ratio can be obtained with a relatively small amount of the blowing agent, and the occurrence of silver streaks can be minimized, so that the effect can be sufficiently exerted even at a relatively low pressure. it can.
- it is preferably in the range of not less than 0.2 IMPa and not more than 5 MPa, more preferably not less than 0.2 MPa and not more than 3 MPa. 0.
- the pressure is less than IMP a, the foaming suppression effect at the flow front is not sufficient, and silver streaks are likely to be formed on the surface of the molded product.
- gas exhaust from the mold is smooth. In some cases, dents due to gas pools remaining in the mold are easily formed on the surface of the molded body.
- the timing of exhausting the gas from the mold is not particularly limited, and may be appropriately selected from the start of normal injection to the end of injection.
- the pressure for pressurizing the inside of the mold is set to IMPa or less in advance, the gas leakage can be prevented even without the O-ring or the like. Since this can be prevented or suppressed by slight gas leakage, the pressure inside the mold can be maintained, and the mold structure can be simplified. Further, when a low counter pressure is sufficient as in the present invention, it is necessary to separately provide a mechanism for removing gas from the mold at a desired timing. It is possible to pressurize and hold the mold using, for example, a gas supplied by a commercially available cylinder.
- a mold composed of a fixed mold and a movable mold that can move forward and backward at any position is used.
- the so-called Core Cavity method Moving Cavity method
- Force A non-foamed layer is formed on the surface, and the foamed layer inside has a high foaming ratio and tends to become uniform fine bubbles. This is preferable because a foamed molded article excellent in quality can be easily obtained.
- the foamed molded article of the present invention thus obtained has a beautiful appearance, a foamed layer having an average cell diameter of preferably 500 ⁇ m or less, more preferably 200 ⁇ m or less; And a non-foamed layer having a thickness of preferably at least 100 ⁇ and not more than 100 ⁇ m, more preferably at least 100 ⁇ m and not more than 500 m. If the average cell diameter of the foam layer exceeds 500 ⁇ , excellent rigidity may not be obtained. If the thickness of the non-foamed layer is less than 1 ⁇ , the surface does not have a beautiful appearance and the rigidity tends to decrease.If the thickness exceeds 100 ⁇ , it may be difficult to obtain light weight ⁇
- the expansion ratio of the foamed molded article of the present invention is preferably 2 times or more and 10 times or less, more preferably 3 times or more and 6 times or less, and the wall thickness is preferably 30 mm or less, more preferably 10 mm or less. It is as follows. If the expansion ratio is less than 2 times, it may be difficult to obtain lightness, and if it exceeds 10 times, the rigidity tends to decrease significantly.
- the expansion ratio referred to in the present invention is obtained from the ratio of the specific gravity of the foamed molded article to that of the non-foamed molded article injection-molded under the same conditions except that no foaming agent is added to the polypropylene resin composition for injection foaming molding. Value.
- the present invention will be described in more detail with reference to Examples. There is no restriction.
- test methods and criteria used for various evaluation methods are as follows.
- Foaming ratio A test piece including a non-foamed layer on the surface was cut out from the foamed molded product, and determined from the ratio of the specific gravity to a separately produced non-foamed molded product having a thickness of 3 mm (Reference Example 1).
- Average cell diameter, thickness of non-foamed layer Determined from a microscopic photograph of a cross section of the foamed molded product cut in the thickness direction.
- the average bubble diameter was an average value of arbitrarily selected 20 cells.
- the average value of the non-foamed layer was the average value of the movable mold side and the fixed mold side.
- Molded body thickness The average value of three points at both ends and the center of the cross section cut in the thickness direction.
- melt tension A capillarograph (manufactured by Toyo Seiki Seisakusho) equipped with an attachment for melt tension measurement was used. 1111 11 1 230, from a die having a hole of length 10 m m, the Stra command which has been lowered by the piston descending speed 1 Omm / min take-off at 1 mZ minute, increasing the take-off speed in later stable 40 mZ min 2 When this was done, the pulling load of the pulley with a load cell when it was broken was taken as the melt tension.
- Injection foaming moldability The number of short shots (defective number) after continuous 20 shot molding was determined and evaluated in the following three stages.
- PP-1 J 707 (propylene / ethylene block copolymer, menoleto flow rate 23 g / l 0 min, melt tension 1 cN or less) manufactured by Grand Polymer Co., Ltd.
- PP-2 PM600A manufactured by Sanalomer (homopolymer, melt flow rate 7.5 gZ 10 minutes, melt tension 1 cN or less)
- MP-2 As a linear polypropylene resin, melt flow rate 9 gZl 0 minutes Polypropylene homopolymer, 0.4 parts by weight of radical polymerization initiator used, supply rate of isoprene monomer at 1 kgZ Modified polypropylene resin obtained in the same manner as MP-1 (except that the melt flow rate was 4 g / 10 min, the maleol tension was 9 cN, and the strain hardening property was obtained).
- MP- 3 (shown homopolymer, melt flow rate 3 8 10 minutes, melt tension 10 c N, the strain hardening property) Sanaroma Inc. PF 814
- MP-4 PF 61 1 manufactured by Sanalomer (homopolymer, melt flow rate S O g / l O, melt tension 1 cN or less, showing strain hardening)
- MP-5 FH6000 manufactured by Chisso (homopolymer, melt flow rate 0.5 g / l 0 min, melt tension 7 cN, does not show strain hardening)
- BA-2 Polystyrene PEM30S manufactured by Eiwa Chemical Co., Ltd. (decomposition temperature 155 ° C, decomposition gas volume 30 ml / g, low-density polyethylene masterbatch)
- the linear polypropylene resin (A), the modified polypropylene resin (B), and the inorganic chemical foaming agent were dry-blended at the composition ratios shown in Table 1 to obtain a polypropylene resin composition for injection foam molding.
- the above resin composition pellet was sprayed on a flat molded body of 31 O mm in length and 190 mm in width by using an “MD350S—IIIDP type” injection molding machine manufactured by Ube Industries, Ltd. Starting foam molded.
- the mold has a gate structure with one point at the center of the molded product, a valve gate with a diameter of 4 mm, and an inner surface of the cavity that has been textured.
- the fixed mold and the movable mold that can move forward and backward to any position
- the format consisted of
- the mold temperature was 50 ° C for both the fixed mold and the movable mold.
- the clearance in the mold at the time of injection was 2 mm.
- the movable mold was retracted, and the final mold clearance was adjusted so as to obtain a predetermined molded body thickness, and foaming was performed.
- Other molding conditions were cylinder temperature of 200 ° C, injection pressure of 10 OMPa, injection speed of 16 Omm / sec, retraction speed of movable mold during foaming of 50 mm / sec, and cooling time of 90 seconds.
- Table 2 shows the moldability at this time, and the shape and physical properties of the obtained foam molded article. Since the polypropylene resin composition of the present invention has excellent fluidity, short shots do not easily occur during continuous molding, and the injection foaming moldability is good.
- the obtained foamed molded product has a molded product thickness of 4.2 to 8.4 mm and an expansion ratio of 2.1 to 4.1 times, and has a high expansion ratio and excellent lightness.
- the average cell diameter of the foamed layer was 200 ⁇ m or less, and the foamed layer had a non-foamed layer (skin layer) of 200 to 400 ⁇ m, and no voids were found inside the molded body.
- the surface appearance and the rigidity of the textured surface are equal to or higher than those of the non-foamed molded article having a thickness of 3 mm which was separately manufactured by injection molding.
- the weight reduction of the foamed molded article of the example relative to the non-foamed molded article of Reference Example 1 is 33%.
- the modified polypropylene resin and the inorganic chemical foaming agent were not used, the initial cavity clearance was set to 3 mm, and after completion of injection filling, cooling was performed for 90 seconds to take out the non-foamed molded body.
- Table 2 shows the results.
- Example 3 The procedure was performed in the same manner as in Example 3 except that the modified polypropylene resin was not used. Table 2 shows the results. When the expansion ratio was doubled, voids were generated inside the foam layer of the molded product, and the rigidity was reduced.
- Example 2 The procedure was performed in the same manner as in Example 3 except that PP-2 was used as the linear polypropylene resin. Table 2 shows the results. In continuous molding, short shots occurred in 4 out of 20 shots (failure rate: 20%), and it was found that injection foaming moldability was poor.
- Example 3 was carried out in the same manner as in Example 3, except that MP-4 (melt tension was out of the range of the present invention) was used as the modified polypropylene resin. Table 2 shows the results. When the expansion ratio was doubled, voids were generated inside the foam layer of the molded product, and the rigidity was reduced.
- MP-4 melt tension was out of the range of the present invention
- Example 3 The procedure was performed in the same manner as in Example 3 except that MP-5 (which does not exhibit the strain hardening property of the present invention) was used as the modified polypropylene resin. Table 2 shows the results. When the foaming ratio doubled, voids were generated inside the foamed layer of the molded product, and the rigidity was reduced.
- MP-5 which does not exhibit the strain hardening property of the present invention
- Example 3 The procedure was performed in the same manner as in Example 3 except that the linear polypropylene-based resin was not used. Table 2 shows the results. In continuous molding, short shots occurred in 5 shots out of 20 shots (defective rate: 25%), demonstrating poor injection foaming moldability. In addition, the surface of the obtained foamed molded article had irregularities, and the surface appearance was poor.
- Comparative Example 1 PP-1 100 1 ⁇ BA— 15 Comparative Example 2 PP— 2 70 MP— 230 BA— 1 5 Comparative Example 3 PP— 1 70 MP— 4 30 B A- 15 Comparative Example 4 PP— 1 70 MP— 5 30 BA— 15 Comparative Example 5 MP-2 100 BA— 15 Table 2 Injection molding Average non-foamed layer
- the injection molding machine used was “MD350S-IIIDP type” manufactured by Ube Industries, Ltd., which had a shirt-off nozzle mechanism at the end of the cylinder.
- the die had a direct sprue gate and a length of 250 mm.
- the inner surface has a glossy finish with a flat plate-shaped cavity.
- the O-ring is inserted into the sliding surface of the fixed type movable type.
- the molding conditions were as follows: resin temperature 200 ° C, mold temperature 50 ° C, injection speed 100 OmniZ seconds, back pressure 5 MPa, cooling time 90 seconds, movable mold retracting during foaming Foam molding was performed at a speed of 5 Omm / sec. That is, the polypropylene resin mixture for injection foam molding obtained by dry-blending the linear polypropylene resin (A), the modified polypropylene resin (B), and the inorganic chemical foaming agent at the composition ratio shown in Table 3 was used.
- the injection molding machine used in Examples 7 to 10 was changed to a vent type specification (a vent port near the center of the cylinder) to use a molding machine in which the vent portion could be pressurized with carbon dioxide.
- the carbon dioxide supply rate to the molten resin was controlled by supplying carbon dioxide at a constant pressure using a “carbon dioxide supply device MA C-100”.
- Injection foam molding obtained by dry blending a linear polypropylene resin (A) with a composition ratio shown in Table 4 and a modified polypropylene resin (B) with 0.5 part of BA-1 added as a nucleating agent.
- a polypropylene-based resin mixture was supplied to the injection molding machine, and carbon dioxide was supplied as a foaming agent in the same manner as in Examples 7 to 10 except that the pressure at the molding machine vent was supplied as shown in Table 4.
- a foam molded article was obtained.
- Tables 5 and 6 show the moldability of Examples 7 to 12, and the shapes and physical properties of the obtained foamed molded products. Since the polypropylene resin composition of the present invention is excellent in fluidity and foaming property, short shot during continuous molding hardly occurs and injection foaming moldability is good. It is good. Further, the surface appearance of the polypropylene resin composition of the present invention can be further improved by applying a counterpressing method.
- the foamed molded article obtained by such a molding method has a specular gloss, a beautiful surface appearance with almost no sill burst leak, a molded article thickness of 4.3 to 8.2 mm, and an expansion ratio of 2.1 to 4 It is within the range of 0 ⁇ , high foaming ratio and excellent in lightness.
- the average cell diameter of the foamed layer was 300 ⁇ m or less, and the foamed layer had a non-foamed layer (skin layer) of 300 ⁇ m, and no voids were found inside the molded body.
- skin layer non-foamed layer
- the surface appearance and the rigidity are equal to or higher than those of the non-foamed molded article having a thickness of 3 mm, which is separately manufactured by injection molding.
- a foamed molded article was obtained in the same manner as in Example 8, except that the modified polypropylene resin was not used. Table 5 shows the results. When the expansion ratio doubled, voids were generated inside the foam layer of the molded product, and the rigidity was reduced.
- a foam molded article was obtained in the same manner as in Example 8, except that PP-2 was used as the linear polypropylene-based resin. Table 5 shows the results. In continuous molding, short shots occurred in 3 out of 20 shots (failure rate: 15%), indicating that injection foaming moldability was poor.
- a foam molded article was obtained in the same manner as in Example 8, except that the modified polypropylene resin used was MP-4 (melt tension was out of the range of the present invention). Table 5 shows the results. When the expansion ratio was doubled, voids were generated inside the foam layer of the molded product, and the rigidity was reduced.
- a foam molded article was obtained in the same manner as in Example 8, except that the modified polypropylene resin used was MP-5 (having no strain hardening property of the present invention). Table 5 shows the results. When the expansion ratio doubled, voids were generated inside the foam layer of the molded product, and the rigidity decreased.
- a foamed molded article was obtained in the same manner as in Example 8, except that the linear polypropylene-based resin was not used. Table 5 shows the results. 4 shots out of 20 shots in continuous molding Short shots occurred in the cuts (20% defect rate), indicating that the injection foaming moldability was poor.
- a foam molded article was obtained in the same manner as in Example 11 except that the modified polypropylene resin was not used.
- This comparative example is an example corresponding to the mode disclosed in JP-A-2002-192549. Table 6 shows the results. When the expansion ratio doubled, voids were generated inside the molded body foam layer, and the rigidity was reduced. Also, the obtained molded article had a dent on the surface. It can be seen that simply employing the conventional counter pressure method does not provide a foamed polypropylene resin molded article having a high expansion ratio and rigidity with a beautiful surface.
- Timing to exhaust gas used for pressurizing the mold in advance (timing)
- Example 8 ⁇ 7.2 3.5 ⁇ 150 300 ⁇ ⁇ / ⁇
- Example 9 ⁇ 8.2 4 ⁇ 140 300 ⁇ ⁇ / ⁇
- the polypropylene resin composition for injection foam molding of the present invention has good injection foam moldability, and the foam molded article obtained thereby has a beautiful surface, light weight, and excellent rigidity. Can be widely used for food packaging containers, home appliances, and building materials.
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/570,670 US7423071B2 (en) | 2003-09-12 | 2004-08-12 | Polypropylene based resin composition, expanded moldings comprising the same and method for production thereof |
AT04771833T ATE500294T1 (de) | 2003-09-12 | 2004-08-12 | Harzzusammensetzung auf basis von polypropylen, diese enthaltende expandierte formkörper und herstellungsverfahren dafür |
DE200460031638 DE602004031638D1 (de) | 2003-09-12 | 2004-08-12 | Harzzusammensetzung auf basis von polypropylen, diese enthaltende expandierte formkörper und herstellungsverfahren dafür |
EP20040771833 EP1666530B1 (en) | 2003-09-12 | 2004-08-12 | Polypropylene based resin composition, expanded moldings comprising the same and method for production thereof |
JP2005513823A JP4745057B2 (ja) | 2003-09-12 | 2004-08-12 | ポリプロピレン系樹脂組成物、それからなる発泡成形体およびその製造方法 |
CA 2537858 CA2537858A1 (en) | 2003-09-12 | 2004-08-12 | Polypropylene based resin composition, expanded moldings comprising the same and method for production thereof |
CN2004800251837A CN1845964B (zh) | 2003-09-12 | 2004-08-12 | 聚丙烯类树脂组合物、含该组合物的发泡成型体及其制造方法 |
Applications Claiming Priority (8)
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JP2003-321711 | 2003-09-12 | ||
JP2003321711 | 2003-09-12 | ||
JP2004-045562 | 2004-02-23 | ||
JP2004045562 | 2004-02-23 | ||
JP2004-072171 | 2004-03-15 | ||
JP2004-072162 | 2004-03-15 | ||
JP2004072162 | 2004-03-15 | ||
JP2004072171 | 2004-03-15 |
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WO2005026255A1 true WO2005026255A1 (ja) | 2005-03-24 |
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PCT/JP2004/011872 WO2005026255A1 (ja) | 2003-09-12 | 2004-08-12 | ポリプロピレン系樹脂組成物、それからなる発泡成形体およびその製造方法 |
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US (1) | US7423071B2 (ja) |
EP (1) | EP1666530B1 (ja) |
JP (1) | JP4745057B2 (ja) |
KR (1) | KR20060130546A (ja) |
CN (1) | CN1845964B (ja) |
AT (1) | ATE500294T1 (ja) |
CA (1) | CA2537858A1 (ja) |
DE (1) | DE602004031638D1 (ja) |
WO (1) | WO2005026255A1 (ja) |
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2004
- 2004-08-12 CA CA 2537858 patent/CA2537858A1/en not_active Abandoned
- 2004-08-12 US US10/570,670 patent/US7423071B2/en active Active
- 2004-08-12 JP JP2005513823A patent/JP4745057B2/ja active Active
- 2004-08-12 DE DE200460031638 patent/DE602004031638D1/de active Active
- 2004-08-12 KR KR1020067004404A patent/KR20060130546A/ko not_active Application Discontinuation
- 2004-08-12 WO PCT/JP2004/011872 patent/WO2005026255A1/ja active Application Filing
- 2004-08-12 AT AT04771833T patent/ATE500294T1/de not_active IP Right Cessation
- 2004-08-12 EP EP20040771833 patent/EP1666530B1/en active Active
- 2004-08-12 CN CN2004800251837A patent/CN1845964B/zh active Active
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JP4519477B2 (ja) * | 2004-02-10 | 2010-08-04 | 株式会社カネカ | ポリプロピレン系樹脂発泡成形体およびその製法 |
JP2005224963A (ja) * | 2004-02-10 | 2005-08-25 | Kaneka Corp | ポリプロピレン系樹脂発泡成形体およびその製法 |
CN1840567B (zh) * | 2005-03-29 | 2011-01-19 | 株式会社Jsp | 聚丙烯类树脂发泡粒子、其成形体及该成形体的制备方法 |
JP2006291066A (ja) * | 2005-04-12 | 2006-10-26 | Kaneka Corp | ポリプロピレン系樹脂射出発泡成形体 |
JP2007015231A (ja) * | 2005-07-08 | 2007-01-25 | Takagi Seiko Corp | 熱可塑性樹脂発泡成形体及びその製造方法 |
JP2007069726A (ja) * | 2005-09-07 | 2007-03-22 | Kaneka Corp | 自動車用ドアトリム |
JP2007284484A (ja) * | 2006-04-13 | 2007-11-01 | Kaneka Corp | ポリプロピレン系樹脂射出発泡成形体 |
WO2009060792A1 (ja) * | 2007-11-05 | 2009-05-14 | Kaneka Corporation | 発泡成形用ポリプロピレン系樹脂組成物及び該樹脂組成物を発泡してなる発泡成形体 |
JPWO2009060792A1 (ja) * | 2007-11-05 | 2011-03-24 | 株式会社カネカ | 発泡成形用ポリプロピレン系樹脂組成物及び該樹脂組成物を発泡してなる発泡成形体 |
WO2011046103A1 (ja) | 2009-10-13 | 2011-04-21 | 株式会社カネカ | ポリプロピレン系樹脂、ポリプロピレン系樹脂組成物、および射出発泡成形体 |
US8552116B2 (en) | 2009-10-13 | 2013-10-08 | Kaneka Corporation | Polypropylene resin, polypropylene resin composition, and foam-injection-molded article |
WO2012090802A1 (ja) * | 2010-12-28 | 2012-07-05 | 旭ファイバーグラス株式会社 | 発泡体、面材強化発泡体及び成形体 |
JP2016000795A (ja) * | 2014-06-12 | 2016-01-07 | 株式会社カネカ | 射出発泡成形用熱可塑性樹脂組成物およびその成形体 |
JP2022554107A (ja) * | 2019-10-21 | 2022-12-28 | 国家能源投資集団有限責任公司 | 発泡性ポリプロピレン組成物、発泡ポリプロピレン及びその製造方法 |
JP7450709B2 (ja) | 2019-10-21 | 2024-03-15 | 国家能源投資集団有限責任公司 | 発泡性ポリプロピレン組成物、発泡ポリプロピレン及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005026255A1 (ja) | 2006-11-16 |
CN1845964B (zh) | 2012-10-03 |
JP4745057B2 (ja) | 2011-08-10 |
US7423071B2 (en) | 2008-09-09 |
CA2537858A1 (en) | 2005-03-24 |
EP1666530A4 (en) | 2009-06-10 |
KR20060130546A (ko) | 2006-12-19 |
EP1666530A1 (en) | 2006-06-07 |
EP1666530B1 (en) | 2011-03-02 |
US20070032600A1 (en) | 2007-02-08 |
ATE500294T1 (de) | 2011-03-15 |
CN1845964A (zh) | 2006-10-11 |
DE602004031638D1 (de) | 2011-04-14 |
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