WO2017082358A1 - ポリプロピレン系樹脂組成物 - Google Patents
ポリプロピレン系樹脂組成物 Download PDFInfo
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- WO2017082358A1 WO2017082358A1 PCT/JP2016/083400 JP2016083400W WO2017082358A1 WO 2017082358 A1 WO2017082358 A1 WO 2017082358A1 JP 2016083400 W JP2016083400 W JP 2016083400W WO 2017082358 A1 WO2017082358 A1 WO 2017082358A1
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- 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
- C08F210/04—Monomers containing three or four carbon atoms
- C08F210/06—Propene
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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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
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- 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
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
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- 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
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/17—Viscosity
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- 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
- C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
- C08F2800/20—Copolymer characterised by the proportions of the comonomers expressed as weight or mass percentages
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/016—Additives defined by their aspect ratio
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
Definitions
- the present invention is a molded product used for, for example, an automobile exterior member and the like, and has a low linear expansion coefficient, a high dimensional stability, and a polypropylene-based resin capable of producing a molded article excellent in surface impact at low temperatures Relates to the composition.
- Molded products obtained by injection-molding a polypropylene resin composition have excellent mechanical properties and moldability, and cost performance that is relatively advantageous compared to other materials. Use in various fields is progressing.
- polypropylene-ethylene-propylene copolymer EPR
- EBR ethylene-butene copolymer
- EOR ethylene-octene copolymer
- SBR styrene-butadiene copolymer
- SEBS polystyrene-ethylene / butene-polystyrene triblock copolymer
- SEBS polystyrene-ethylene / butene-polystyrene triblock copolymer
- SEBS polystyrene-ethylene / butene-polystyrene triblock copolymer
- a method for producing a low linear expansion material characterized by the combined use of a propylene block copolymer comprising crystalline polypropylene having a melt flow rate of 500 g / 10 min or more and a low molecular weight polyolefin (Patent Document 1), propylene block A resin composition in which a specific ethylene / butene-1 copolymer is blended with a copolymer (Patent Document 2), and the blending ratio and viscosity of an amorphous part and a crystalline part of a propylene block copolymer are defined.
- JP 2010-077396 A Japanese Patent Laid-Open No. 5-051498 JP 2000-095919 A JP 2007-91789 A JP 2013-159709 A JP 2014-58614 A
- the present invention is intended to solve the above-described problems of the prior art.
- the object of the present invention is a molded article used for, for example, an automobile exterior member, etc., which has a low coefficient of linear expansion, has high dimensional stability, and can produce a molded article excellent in surface impact at low temperatures. It is in providing a resin-based resin composition.
- the gist of the present invention is as follows.
- A propylene polymer having a melt flow rate (230 ° C., 2.16 kg load) of 50 to 150 g / 10 min and a decane-soluble part amount of 6% by mass or more
- B propylene homopolymer having a melt flow rate (230 ° C.
- the propylene polymer (A) is a block copolymer obtained from propylene and ethylene, and the intrinsic viscosity [ ⁇ ] of the decane soluble part of the copolymer is 2 to 9 dl / g. ]
- Polypropylene resin composition is a block copolymer obtained from propylene and ethylene, and the intrinsic viscosity [ ⁇ ] of the decane soluble part of the copolymer is 2 to 9 dl / g.
- the polypropylene resin composition of the present invention it is possible to produce a molded article having excellent injection moldability, excellent dimensional stability, and excellent mechanical properties such as rigidity and surface impact properties at low temperatures.
- a molded body is suitable for various uses such as automobile exterior parts.
- the polypropylene resin composition of this invention the molded object which has such an outstanding characteristic can be manufactured economically.
- the propylene polymer (A) used in the present invention is a propylene polymer having a melt flow rate (230 ° C., 2.16 kg load) of 50 to 150 g / 10 min and a decane-soluble part amount of 6% by mass or more. is there.
- the propylene-based polymer (A) substantially includes a decane soluble part (a1) of 6% by mass or more and a decane insoluble part (a2) of 94% by mass or less.
- the decane-insoluble part (a2) is a component that is generally insoluble in an n-decane solvent at room temperature (23 ° C.), and usually a propylene homopolymer part (propylene homopolymer component) occupying in the propylene-based polymer (A).
- the decane-soluble part (a1) is equivalent to a part other than the propylene homopolymer part, and is preferably a copolymer part (ethylene / propylene copolymer component) of propylene and ethylene.
- the propylene-based polymer (A) usually includes a decane soluble part (a1) of 6% by mass or more and a decane insoluble part (a2) of 94% by mass or less, preferably 6 to 20% by mass of a decane soluble part.
- it preferably contains 7 to 12% by mass of the decane soluble part (a1) and 88 to 93% by mass of the decane insoluble part (a2) [where the sum of the contents of (a1) and (a2) Is 100% by weight].
- the propylene polymer (A) is preferably a propylene block copolymer obtained from propylene and ethylene.
- the intrinsic viscosity [ ⁇ ] of the decane soluble part (A) of this propylene-based block copolymer is preferably 2 to 9 dl / g, more preferably 3 to 8 dl / g.
- the melt flow rate (230 ° C., 2.16 kg load) of the propylene polymer (A) is 50 to 150 g / 10 minutes, preferably 50 to 130 g / 10 minutes, more preferably 60 to 120 g / 10 minutes, particularly It is preferably 70 to 110 g / 10 minutes.
- the propylene polymer (A) can be produced by a known method. For example, propylene is polymerized using an olefin polymerization catalyst including a solid titanium catalyst component (I) and an organometallic compound catalyst component (II) described below, and propylene and ethylene are further copolymerized to produce propylene. A system block copolymer is obtained.
- Solid titanium catalyst component (I) The solid titanium catalyst component (I) constituting the olefin polymerization catalyst contains, for example, titanium, magnesium, halogen, and, if necessary, an electron donor.
- Known components can be used for the solid titanium catalyst component (I) without limitation.
- magnesium compounds include magnesium halides such as magnesium chloride and magnesium bromide; alkoxymagnesium halides such as methoxymagnesium chloride, ethoxymagnesium chloride and phenoxymagnesium chloride; ethoxymagnesium, isopropoxymagnesium, butoxymagnesium and 2-ethyl Alkoxymagnesium such as hexoxymagnesium; aryloxymagnesium such as phenoxymagnesium; magnesium carboxylates such as magnesium stearate;
- a magnesium compound may be used individually by 1 type, and may be used in combination of 2 or more type.
- the magnesium compound may be a complex compound with another metal, a double compound, or a mixture with another metal compound.
- a magnesium compound containing a halogen is preferable, and a magnesium halide, particularly magnesium chloride is more preferable.
- alkoxy magnesium such as ethoxy magnesium is also preferable.
- the magnesium compound may be a compound derived from another substance, for example, a compound obtained by bringing an organic magnesium compound such as a Grignard reagent into contact with titanium halide, silicon halide, halogenated alcohol or the like.
- titanium compound the tetravalent titanium compound shown by a following formula is mentioned, for example.
- Ti (OR) g X 4-g In the formula, R is a hydrocarbon group, X is a halogen atom, and g is 0 ⁇ g ⁇ 4.
- titanium compounds include titanium tetrahalides such as TiCl 4 and TiBr 4 ; Ti (OCH 3 ) Cl 3 , Ti (OC 2 H 5 ) Cl 3 , Ti (On-C 4 H 9 ) Cl 3 , trihalogenated alkoxytitanium such as Ti (OC 2 H 5 ) Br 3 , Ti (Oi—C 4 H 9 ) Br 3 ; Ti (OCH 3 ) 2 Cl 2 , Ti (OC 2 H 5 ) 2 Dihalogenated alkoxytitanium such as Cl 2 ; monohalogenated alkoxytitanium such as Ti (OCH 3 ) 3 Cl, Ti (On—C 4 H 9 ) 3 Cl, Ti (OC 2 H 5 ) 3 Br; Ti ( And tetraalkoxy titanium such as OCH 3 ) 4 , Ti (OC 2 H 5 ) 4 , Ti (OC 4 H 9 ) 4 , and Ti (O-2-ethylhexyl) 4 .
- a titanium compound may be used
- magnesium compound and titanium compound for example, compounds described in detail in JP-A-57-63310, JP-A-5-170843 and the like can also be used.
- Specific examples of preferred methods for preparing the solid titanium catalyst component (I) used in the present invention include the following methods (P-1) to (P-4).
- P-1) An inert hydrocarbon solvent comprising a solid adduct composed of an electron donor component (1) such as a magnesium compound and alcohol, an electron donor component (2) described later, and a titanium compound in a liquid state A method of contacting in suspension in the presence of coexistence.
- P-2) A method in which a solid adduct comprising a magnesium compound and an electron donor component (1), an electron donor component (2), and a titanium compound in a liquid state are contacted in a plurality of times.
- (P-3) A solid adduct comprising a magnesium compound and an electron donor component (1), an electron donor component (2), and a liquid titanium compound are suspended in the presence of an inert hydrocarbon solvent. The method of making it contact in a state and making it contact in multiple times.
- (P-4) A method of bringing a liquid magnesium compound comprising a magnesium compound and an electron donor component (1) into contact with the liquid titanium compound and the electron donor component (2).
- the reaction temperature for preparing the solid titanium catalyst component (I) is preferably ⁇ 30 to 150 ° C., more preferably ⁇ 25 to 130 ° C., and particularly preferably ⁇ 25 to 120 ° C.
- the preparation of the solid titanium catalyst component (I) can be carried out in the presence of a known medium, if necessary.
- a known medium include aromatic hydrocarbons such as toluene having a slight polarity, and known aliphatic hydrocarbons or alicyclic hydrocarbon compounds such as heptane, octane, decane, and cyclohexane. Of these, aliphatic hydrocarbons are preferred.
- the electron donor component (1) used for forming a solid adduct or a magnesium compound in a liquid state a known compound that can solubilize the magnesium compound in a temperature range of room temperature to about 300 ° C. is preferable.
- a known compound that can solubilize the magnesium compound in a temperature range of room temperature to about 300 ° C. is preferable.
- alcohol, aldehyde , Amines, carboxylic acids and mixtures thereof are preferred. Examples of these compounds include the compounds described in JP-A-57-63310 and JP-A-5-170843.
- alcohols that can solubilize magnesium compounds include methanol, ethanol, propanol, butanol, isobutanol, ethylene glycol, 2-methylpentanol, 2-ethylbutanol, n-heptanol, n-octanol, and 2-ethylhexanol.
- Aliphatic alcohols such as decanol and dodecanol; alicyclic alcohols such as cyclohexanol and methylcyclohexanol; aromatic alcohols such as benzyl alcohol and methylbenzyl alcohol; aliphatic alcohols having an alkoxy group such as n-butyl cellosolve; Etc.
- carboxylic acid examples include organic carboxylic acids having 7 or more carbon atoms such as caprylic acid and 2-ethylhexanoic acid.
- aldehyde examples include aldehydes having 7 or more carbon atoms such as capric aldehyde and 2-ethylhexyl aldehyde.
- amine examples include amines having 6 or more carbon atoms such as heptylamine, octylamine, nonylamine, laurylamine, 2-ethylhexylamine and the like.
- the electron donor component (1) the above alcohols are preferable, and ethanol, propanol, butanol, isobutanol, hexanol, 2-ethylhexanol, and decanol are particularly preferable.
- the composition ratio of magnesium and the electron donor component (1) in the solid adduct or liquid magnesium compound obtained varies depending on the type of compound used, but cannot be specified unconditionally.
- the amount of the electron donor component (1) is preferably 2 mol or more, more preferably 2.3 mol or more, particularly preferably 2.7 mol or more and 5 mol or less.
- electron donor component (2) an aromatic carboxylic acid ester and / or a compound having two or more ether bonds via a plurality of carbon atoms.
- Examples of the electron donor component (2) include known aromatic carboxylic acid esters and polyether compounds that have been preferably used in conventional olefin polymerization catalysts, such as JP-A Nos. 5-170843 and 2001-354714. Etc. can be used without limitation.
- aromatic carboxylic acid ester examples include aromatic polycarboxylic acid esters such as phthalic acid esters in addition to aromatic carboxylic acid monoesters such as benzoic acid esters and toluic acid esters. Of these, aromatic polycarboxylic acid esters are preferable, and phthalic acid esters are more preferable.
- phthalates phthalic acid alkyl esters such as ethyl phthalate, n-butyl phthalate, isobutyl phthalate, hexyl phthalate and heptyl phthalate are preferable, and diisobutyl phthalate is particularly preferable.
- polyether compound examples include compounds represented by the following chemical structural formula (1).
- m is an integer of 1 ⁇ m ⁇ 10, more preferably an integer of 3 ⁇ m ⁇ 10, and R 11 to R 36 are each independently a hydrogen atom, carbon, hydrogen, oxygen , Fluorine, chlorine, bromine, iodine, nitrogen, sulfur, phosphorus, boron, and silicon, and a substituent having at least one element selected from silicon.
- R 11 and R 12 may be the same or different.
- Arbitrary R 11 to R 36 preferably R 11 and R 12 may jointly form a ring other than a benzene ring.
- Such compounds include monosubstituted dialkoxy such as 2-isopropyl-1,3-dimethoxypropane, 2-s-butyl-1,3-dimethoxypropane, 2-cumyl-1,3-dimethoxypropane and the like.
- a polyether compound may be used individually by 1 type, and may be used in combination of 2 or more type.
- 1,3-diethers are preferable, and in particular, 2-isopropyl-2-isobutyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1 1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-bis (cyclohexylmethyl) 1,3-dimethoxypropane are preferred.
- halogen / titanium (atomic ratio) that is, the number of moles of halogen atoms / the number of moles of titanium atoms
- the (1) / titanium atom (molar ratio) is 0 to 100, preferably 0 to 10
- the electron donor component (2) / titanium atom (molar ratio) is 0 to 100, preferably 0 to 10.
- Magnesium / titanium (atomic ratio) that is, the number of moles of magnesium atoms / the number of moles of titanium atoms
- the conditions described in EP585869A1 and JP-A-5-170843 are preferably used except that the electron donor component (2) is used. Can do.
- the organometallic compound catalyst component (II) is a component containing a metal element selected from Group 1, Group 2 and Group 13 of the periodic table.
- a compound containing a Group 13 metal such as an organoaluminum compound, a complex alkylated product of a Group 1 metal and aluminum, an organometallic compound of a Group 2 metal, or the like can be used.
- an organoaluminum compound is preferable.
- organometallic compound catalyst component (II) an organometallic compound catalyst component described in a known document such as EP585869A1 can be suitably used.
- a known electron donor component (3) may be used in combination with the electron donor component (1) and the electron donor component (2) described above.
- an organosilicon compound is preferred.
- This organosilicon compound is, for example, a compound represented by the following formula.
- R n Si (OR ′) 4-n In the formula, R and R ′ are hydrocarbon groups, and n is an integer of 0 ⁇ n ⁇ 4.
- organosilicon compound represented by the above formula examples include diisopropyldimethoxysilane, t-butylmethyldimethoxysilane, t-butylmethyldiethoxysilane, t-amylmethyldiethoxysilane, dicyclohexyldimethoxysilane, and cyclohexylmethyldimethoxysilane.
- vinyltriethoxysilane diphenyldimethoxysilane, dicyclohexyldimethoxysilane, cyclohexylmethyldimethoxysilane, and dicyclopentyldimethoxysilane are preferable.
- a silane compound represented by the following formula described in International Publication No. 2004/016662 pamphlet is also a preferable example of the organosilicon compound.
- R a is a hydrocarbon group having 1 to 6 carbon atoms.
- an unsaturated or saturated aliphatic hydrocarbon group having 1 to 6 carbon atoms, particularly a hydrocarbon group having 2 to 6 carbon atoms is preferable.
- Specific examples include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, n-pentyl group, iso-pentyl group, cyclopentyl group, n -Hexyl group, cyclohexyl group and the like.
- an ethyl group is particularly preferable.
- R b is a hydrocarbon group having 1 to 12 carbon atoms or hydrogen.
- an unsaturated or saturated aliphatic hydrocarbon group having 1 to 12 carbon atoms or hydrogen include hydrogen atom, methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, n-pentyl group, iso-pentyl group, cyclopentyl. Group, n-hexyl group, cyclohexyl group, octyl group and the like. Of these, an ethyl group is particularly preferable.
- R c is a hydrocarbon group having 1 to 12 carbon atoms.
- an unsaturated or saturated aliphatic hydrocarbon group having 1 to 12 carbon atoms include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, n-pentyl group, iso-pentyl group, cyclopentyl group, n -Hexyl group, cyclohexyl group, octyl group and the like.
- an ethyl group is particularly preferable.
- organosilicon compound represented by the above formula examples include dimethylaminotriethoxysilane, diethylaminotriethoxysilane, diethylaminotrimethoxysilane, diethylaminotri-n-propoxysilane, di-n-propylaminotriethoxysilane, methyl-n- Examples include propylaminotriethoxysilane, t-butylaminotriethoxysilane, ethyl n-propylaminotriethoxysilane, ethyl iso-propylaminotriethoxysilane, and methylethylaminotriethoxysilane.
- RN is a cyclic amino group.
- Specific examples include perhydroquinolino group, perhydroisoquinolino group, 1,2,3,4-tetrahydroquinolino group, 1,2,3,4-tetrahydroisoquinolino group, octamethyleneimino group and the like. Can be mentioned.
- R a is the same as described above.
- organosilicon compound represented by the above formula examples include (perhydroquinolino) triethoxysilane, (perhydroisoquinolino) triethoxysilane, and (1,2,3,4-tetrahydroquinolino) triethoxy. Silane, (1,2,3,4-tetrahydroisoquinolino) triethoxysilane, octamethyleneiminotriethoxysilane and the like.
- organosilicon compounds described above may be used in combination of two or more.
- the propylene / ethylene block copolymer which is a preferred embodiment of the propylene polymer (A), is obtained by polymerizing propylene in the presence of the above-described olefin polymerization catalyst, and then copolymerizing propylene and ethylene, or prepolymerizing. Propylene is polymerized in the presence of the prepolymerized catalyst obtained in this manner, and then propylene and ethylene are copolymerized.
- the prepolymerization is performed by prepolymerizing the olefin in an amount of usually 0.1 to 1000 g, preferably 0.3 to 500 g, particularly preferably 1 to 200 g per 1 g of the olefin polymerization catalyst.
- a catalyst having a higher concentration than the catalyst concentration in the system in the main polymerization can be used.
- the concentration of the solid titanium catalyst component (I) in the prepolymerization is usually from 0.001 to 200 mmol, preferably from 0.01 to 50 mmol, more preferably from 0.1 to 200 mmol in terms of titanium atom per liter of the liquid medium. 20 mmol.
- the amount of the organometallic compound catalyst component (II) in the prepolymerization is such that usually 0.1 to 1000 g, preferably 0.3 to 500 g of polymer is produced per 1 g of the solid titanium catalyst component (I).
- the amount is usually 0.1 to 300 moles, preferably 0.5 to 100 moles, more preferably 1 to 50 moles per mole of titanium atoms in the solid titanium catalyst component (I).
- the electron donor component can be used as necessary.
- these components are usually 0.1 to 50 mol per mol of titanium atom in the solid titanium catalyst component (I).
- the amount is preferably 0.5 to 30 mol, more preferably 1 to 10 mol.
- the prepolymerization can be performed under mild conditions by adding an olefin and the above catalyst components to an inert hydrocarbon medium.
- an inert hydrocarbon medium is used, the prepolymerization is preferably performed in a batch mode.
- the inert hydrocarbon medium include aliphatic hydrocarbons such as propane, butane, pentane, hexane, heptane, octane, decane, dodecane, and kerosene; cyclopentane, methylcyclopentane, cyclohexane, cycloheptane, methylcycloheptane And alicyclic hydrocarbons such as cyclooctane; aromatic hydrocarbons such as benzene, toluene and xylene; halogenated hydrocarbons such as ethylene chloride and chlorobenzene; or a mixture thereof. Of these, aliphatic hydrocarbons are preferred.
- Prepolymerization can also be performed using olefin itself as a solvent. It is also possible to perform prepolymerization in a substantially solvent-free state. In this case, it is preferable to perform preliminary polymerization continuously.
- the olefin used in the prepolymerization may be the same as or different from the olefin used in the main polymerization described later.
- the olefin propylene is particularly preferable.
- the temperature during the prepolymerization is usually ⁇ 20 to 100 ° C., preferably ⁇ 20 to 80 ° C., more preferably 0 to 40 ° C.
- the main polymerization is divided into a process for producing a propylene homopolymer component and a process for producing a propylene-ethylene copolymer component.
- the main polymerization (and preliminary polymerization) can be carried out by any of liquid phase polymerization methods such as bulk polymerization method, solution polymerization, suspension polymerization, or gas phase polymerization method.
- liquid phase polymerization such as bulk polymerization or suspension polymerization or gas phase polymerization is preferable.
- the process for producing the propylene-ethylene copolymer component is preferably liquid phase polymerization or gas phase polymerization such as bulk polymerization or suspension polymerization, and more preferably gas phase polymerization.
- the reaction solvent may be an inert hydrocarbon used during the above-described prepolymerization, or an olefin that is liquid at the reaction temperature and pressure.
- the solid titanium catalyst component (I) is usually in an amount of 0.0001 to 0.5 mmol, preferably 0.005 to 0.1 mmol, in terms of titanium atom per liter of polymerization volume. Used.
- the organometallic compound catalyst component (II) is usually used in an amount of 1 to 2000 mol, preferably 5 to 500 mol, per 1 mol of titanium atom in the prepolymerization catalyst component in the polymerization system.
- an electron donor component it is usually from 0.001 to 50 mol, preferably from 0.01 to 30 mol, more preferably from 0.05 to 20 mol, based on 1 mol of the organometallic compound catalyst component (II). Used in molar amounts.
- the molecular weight of the obtained polymer can be adjusted (lowered), and a polymer having a high melt flow rate (MFR) can be obtained.
- MFR melt flow rate
- the amount of hydrogen necessary to adjust the molecular weight varies depending on the type of production process used, the polymerization temperature, and the pressure, and may be adjusted as appropriate.
- the MFR can be adjusted by adjusting the polymerization temperature and the amount of hydrogen.
- the intrinsic viscosity can be adjusted by adjusting the polymerization temperature, pressure and hydrogen amount.
- the polymerization temperature of the olefin is usually 0 to 200 ° C., preferably 30 to 100 ° C., more preferably 50 to 90 ° C.
- the pressure gauge pressure
- the pressure is usually normal pressure to 100 kgf / cm 2 (9.8 MPa), preferably 2 to 50 kgf / cm 2 (0.20 to 4.9 MPa).
- the polymerization can be carried out by any of batch, semi-continuous and continuous methods.
- the reactor can be tubular or tank type.
- the polymerization can be carried out in two or more stages by changing the reaction conditions. In this case, a tubular shape and a tank shape can be combined.
- an ethylene / (ethylene + propylene) gas ratio is set in the polymerization step 2 described later. Control.
- the ethylene / (ethylene + propylene) gas ratio is usually 5 to 80 mol%, preferably 10 to 70 mol%, more preferably 15 to 60 mol%.
- the decane insoluble portion (a2) of the propylene / ethylene block copolymer is mainly composed of a propylene homopolymer component.
- the decane soluble part (a1) is mainly composed of an ethylene / propylene copolymer component which is a rubber-like component.
- a propylene / ethylene block copolymer which is a preferred embodiment of the propylene-based polymer (A) can be obtained by continuously performing the following two polymerization steps 1 and 2.
- (Polymerization process 1) A step of producing propylene homopolymer component by polymerizing propylene in the presence of a solid titanium catalyst component (propylene homopolymer production step).
- Polymerization process 2 A step of producing an ethylene / propylene copolymer component by copolymerizing propylene and ethylene in the presence of a solid titanium catalyst component (copolymer rubber production step).
- each polymerization process 1 and 2 can also be performed using two or more polymerization tanks.
- the content of the decane-soluble part (a1) can be adjusted by the polymerization time (residence time) of the polymerization step 1 and the polymerization step 2.
- the propylene homopolymer (B) used in the present invention is a propylene homopolymer having a melt flow rate (230 ° C., 2.16 kg load) of 10 to 500 g / 10 min.
- the propylene homopolymer (B) may be a polymer obtained by substantially polymerizing only propylene.
- a homopolymer obtained by polymerizing only propylene, or a crystalline polymer obtained by copolymerizing propylene with another ⁇ -olefin of 6 mol% or less, preferably 3 mol% or less can be used.
- a homopolymer obtained by polymerizing only propylene is preferable.
- the propylene homopolymer (B) can be produced by polymerizing monomers mainly containing propylene by a known method.
- an olefin polymerization catalyst containing the above-described solid titanium catalyst component (I) and organometallic compound catalyst component (II), or a titanium trichloride and alkylaluminum compound usually referred to as a Ziegler-Natta type catalyst It is obtained by polymerizing propylene-based monomers in the presence of a combination catalyst.
- the polymerization reaction may be performed continuously or batchwise. For example, it can manufacture suitably by performing only the polymerization process 1 demonstrated previously.
- the polymerization temperature is usually 0 to 200 ° C., preferably 30 to 100 ° C., more preferably 50 to 90 ° C.
- the pressure is usually normal pressure to 100 kgf / cm 2 (9.8 MPa), preferably 2 to 50 kgf / cm 2 (0.20 to 4.9 MPa).
- the melt flow rate (230 ° C., 2.16 kg load) of the propylene homopolymer (B) is 10 to 500 g / 10 minutes, preferably 10 to 300 g / 10 minutes, more preferably 20 to 250 g / 10 minutes. .
- the propylene homopolymer (B) may be one type of polymer, and two or more types of propylene homopolymers may be arbitrarily combined within a range satisfying the above melt flow rate as a whole.
- the ethylene / ⁇ -olefin copolymer (C) used in the present invention is a random copolymer of ethylene and an ⁇ -olefin having 4 to 8 carbon atoms, and has a density of 0.850 to 0.890 g / cm. 3.
- This ethylene / ⁇ -olefin copolymer (C) is expected to contribute to the improvement of the dimensional stability (reduction of the linear expansion coefficient) of the molded product due to the synergistic effect with other components. This contributes to the improvement of the properties and develops a high balance of physical properties in the molded product.
- the ⁇ -olefin having 4 to 8 carbon atoms constituting the ethylene / ⁇ -olefin copolymer (C) is preferably 1-butene, 1-hexene or 1-octene.
- One ⁇ -olefin may be used alone, or two or more ⁇ -olefins may be used in combination.
- the ethylene / ⁇ -olefin copolymer (C) an ethylene-octene copolymer and an ethylene-butene copolymer are particularly preferable.
- the melt flow rate (230 ° C., 2.16 kg load) of the ethylene / ⁇ -olefin copolymer (C) is 0.5 to 30 g / 10 minutes, preferably 1 to 25 g / 10 minutes, more preferably 2 ⁇ 20 g / 10 min. If the melt flow rate is 0.5 g / 10 min or more, the flowability of the polypropylene-based resin composition and poor dispersion during kneading are unlikely to occur, and the physical properties such as impact resistance and the appearance of the molded product surface are reduced. It tends to be difficult for deterioration to occur. Moreover, if the melt flow rate is 30 g / 10 min or less, the molded product tends to have sufficient impact resistance.
- the density of the ethylene ⁇ alpha-olefin copolymer (C) is 0.850 ⁇ was 0.890 g / cm 3, preferably 0.850 ⁇ 0.880 g / cm 3, more preferably 0.855 to 0. 875 g / cm 3 .
- the inorganic filler (D) used in the present invention is an inorganic filler having an average particle diameter of more than 3.0 ⁇ m and less than 5.0 ⁇ m.
- the inorganic filler (D) include talc, calcium carbonate, natural mica, synthetic mica, wollastonite, montmorillonite and the like.
- An inorganic filler (D) may be used individually by 1 type, and may be used in combination of 2 or more type. Of these, talc is preferable.
- the average particle size of the inorganic filler (D) is more than 3.0 ⁇ m and less than 5.0 ⁇ m, preferably 3.2 to 4.9 ⁇ m, more preferably 3.3 to 4.9 ⁇ m, particularly preferably 3. 4 to 4.8 ⁇ m.
- This average particle diameter is a value measured by a laser diffraction method. Specifically, it is the particle size at an integrated value of 50% in the particle size distribution obtained by a particle size distribution meter such as a laser diffraction / scattering particle size distribution meter.
- a particle size distribution meter such as a laser diffraction / scattering particle size distribution meter.
- the measuring device for example, MT3300EXII manufactured by Microtrac, LA- manufactured by Horiba, Ltd. 920 type etc. are mentioned.
- the aspect ratio of the inorganic filler (D) is not particularly limited, but is usually 3 or more and less than 15, preferably 4 to 13, more preferably 5 to 11.
- the aspect ratio is a value representing the ratio of the major axis to the thickness of the filler or the ratio of the long side to the short side. If this aspect ratio is 3 or more, the rigidity and dimensional stability of the molded product tend not to decrease. On the other hand, if it is less than 15, the balance of mechanical properties is unlikely to decrease, and the impact strength tends not to decrease.
- this aspect ratio is a value obtained by taking a photograph using an electron microscope, measuring the long diameter and thickness of the powder, obtaining an average value, and calculating an average particle diameter / average thickness ratio.
- the inorganic filler (D) contributes to the improvement of the dimensional stability (reduction of the linear expansion coefficient) of the molded body and the improvement of mechanical properties such as rigidity and impact strength.
- the inorganic filler (D) has particularly excellent dimensional stability and excellent rigidity and impact strength due to a synergistic effect with other components. A high balance of physical properties is expressed.
- any shape of inorganic filler such as granular, plate-like, rod-like, fiber-like, whisker-like can be used.
- the inorganic filler marketed as a filler for polymers can also be used.
- a chopped strand form, a compressed soul form, a pellet (granulated) form, a granule form or the like with improved handling convenience can be used.
- powder, compressed soul, and granule are preferable.
- the inorganic filler (D) may be a mixture of two or more inorganic fillers as long as it satisfies the above average particle diameter (and aspect ratio) as a whole.
- the method for producing the inorganic filler (D) is not particularly limited, and can be produced by various known methods.
- talc as the inorganic filler (D)
- talc having a specific average particle diameter and aspect ratio can be produced by pulverization or granulation.
- the aspect ratio and average particle diameter of talc can be adjusted as appropriate according to the pulverization apparatus and pulverization time, and talc having a controlled shape can be obtained by classification as necessary.
- a raw material obtained by pulverizing a raw stone may be used directly, or at least a part of which is surface-treated may be used.
- various surface treatment agents such as an organic titanate coupling agent, an organic silane coupling agent, an unsaturated carboxylic acid, or a modified polyolefin grafted with an anhydride thereof, a fatty acid, a fatty acid metal salt, and a fatty acid ester are used.
- a surface treating agent may be used individually by 1 type, and may be used in combination of 2 or more type.
- the polypropylene resin composition of the present invention may further contain a nucleating agent (E) as necessary within the range not impairing the object of the present invention.
- the nucleating agent (E) is used for the purpose of, for example, further improving the dimensional stability (reducing the linear expansion coefficient) and improving the impact strength of the polypropylene resin composition and the molded product thereof.
- Specific examples of the nucleating agent (E) include compounds represented by the following chemical structural formula (2) and various nucleating agents such as inorganic, sorbitol, carboxylic acid metal salt, and organic phosphate. It is done.
- n is an integer of 0 to 2
- R 1 to R 5 may be the same or different from each other, and are a hydrogen atom or an alkyl group, alkenyl group, alkoxy group having 1 to 20 carbon atoms.
- examples of the inorganic nucleating agent include silica.
- examples of sorbitol nucleating agents include 1,3,4,4-dibenzylidene-sorbitol, 1,3,2,4-di- (p-methyl-benzylidene) sorbitol, 1,3,4,4-di- (P-ethyl-benzylidene) sorbitol, 1,3,4,4-di- (2 ′, 4′-di-methyl-benzylidene) sorbitol, 1,3-p-chlorobenzylidene-2,4-p-methyl -Benzylidene-sorbitol, 1,3,2,4-di- (p-propylbenzylidene) sorbitol and the like.
- Examples of the carboxylic acid metal salt nucleating agent include aluminum mono-hydroxy-di-pt-butylbenzoate, sodium benzoate, calcium montanate and the like.
- Examples of the organic phosphate nucleating agent include sodium bis (4-t-butylphenyl) phosphate, sodium-2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate, lithium- Examples include 2,2′-methylene-bis (4,6-di-t-butylphenyl) phosphate.
- a nucleating agent (E) may be used individually by 1 type, and may use 2 or more types together.
- the compound represented by the chemical structural formula (2) is preferable from the viewpoint of improvement of dimensional stability (reduction of linear expansion coefficient) and improvement of impact strength.
- N is an integer of 0 to 2
- R 1 , R 2 , R 4 and R 5 are hydrogen atoms
- R 3 and R 6 may be the same or different from each other
- the number of carbon atoms is 1 to More preferred are compounds that are 20 alkyl groups.
- n is an integer of 0 to 2
- R 1 , R 2 , R 4 and R 5 are hydrogen atoms
- R 3 is —CH 3 , —CH 2 CH 3 , —CH 2 CH 2 CH 3 , —CH 2 CH 2 CH 2 CH 3 , —CH 2 CH ⁇ CH 2 , —CH (CH 3 ) CH ⁇ CH 2 , —CH 2 CH (X 1 ) —CH 2 (X 2 ), —CH 2 CH (X 3 ) —CH 2 CH 3 , —CH 2 CH (X 4 ) —CH 2 OH, or —CH 2 (OH) —CH (OH) —CH 2 OH (where X 1 to X 4 are independent of each other)
- R 6 is an alkyl group having 1 to 20 carbon atoms is particularly preferred.
- the content of the nucleating agent (E) is not particularly limited, but is usually 0.05 to 0.5 parts by weight, preferably 0.1 to 0.00 parts, relative to a total of 100 parts by weight of the components (A) to (D). 4 parts by mass. If content of a nucleating agent (E) is 0.05 mass part or more, it exists in the tendency for the effect of the reduction of a low linear expansion coefficient to express more. Moreover, if it is 0.5 mass part or less, it exists in the tendency for the impact strength and economical efficiency of a molded object to fall easily.
- additives such as a colorant, a lubricant, and a pigment can be blended as long as the object of the present invention is not impaired.
- the order of mixing the additives is arbitrary, and may be mixed at the same time, or a multistage mixing method in which some components are mixed and then other components are mixed.
- the polypropylene resin composition of the present invention comprises 5 to 47 parts by mass of a propylene polymer (A), 0 to 30 parts by mass of a propylene homopolymer (B), and 23 to 30 of an ethylene / ⁇ -olefin copolymer (C). Parts by mass and 30 to 40 parts by mass of the inorganic filler (D) [provided that the total amount of the components (A) to (D) is 100 parts by mass. ] Is contained.
- the polypropylene resin composition of the present invention is preferably a propylene polymer (A) of 7 to 35 parts by mass, a propylene homopolymer (B) of 10 to 30 parts by mass, and an ethylene / ⁇ -olefin copolymer (C). 23 to 28 parts by mass and 32 to 40 parts by mass of the inorganic filler (D) [provided that the total amount of the components (A) to (D) is 100 parts by mass. ] Is contained.
- A propylene polymer
- B propylene homopolymer
- C ethylene / ⁇ -olefin copolymer
- the polypropylene resin composition of the present invention is 8 to 28 parts by mass of a propylene polymer (A), 15 to 30 parts by mass of a propylene homopolymer (B), an ethylene / ⁇ -olefin copolymer (C ) 24 to 28 parts by mass and 33 to 38 parts by mass of the inorganic filler (D) [provided that the total amount of the components (A) to (D) is 100 parts by mass. ] Is contained.
- the polypropylene resin composition of the present invention is particularly preferably 10 to 22 parts by mass of a propylene polymer (A), 20 to 30 parts by mass of a propylene homopolymer (B), an ethylene / ⁇ -olefin copolymer (C 24 to 27 parts by mass, and inorganic filler (D) 34 to 37 parts by mass [provided that the total amount of components (A) to (D) is 100 parts by mass. ] Is contained.
- the polypropylene resin composition of the present invention can be produced by blending the above-described components (A) to (D) and, if necessary, the component (E) and other optional components. Each component may be blended sequentially in an arbitrary order, or may be mixed simultaneously. Moreover, you may employ
- each component for example, there is a method of mixing or melt-kneading each component simultaneously or sequentially using a mixing apparatus such as a Banbury mixer, a single screw extruder, a twin screw extruder, or a high speed twin screw extruder. Can be mentioned.
- a mixing apparatus such as a Banbury mixer, a single screw extruder, a twin screw extruder, or a high speed twin screw extruder.
- the melt flow rate (230 ° C., 2.16 kg load) of the polypropylene resin composition of the present invention is usually 23 g / 10 minutes or more, preferably more than 23 g / 10 minutes and 50 g / 10 minutes or less. By setting the melt flow rate in such a range, it is possible to suppress the deterioration of the coating appearance after injection molding.
- the molding method of the polypropylene resin composition of the present invention is not particularly limited, and various known methods can be used as the molding method of the resin composition.
- a molded product obtained from the polypropylene resin composition of the present invention has a small dimensional change due to a temperature change and excellent dimensional stability.
- injection molding and press molding are particularly preferable.
- the polypropylene resin composition of the present invention can be suitably used in various fields such as automotive interior / exterior members (particularly automotive exterior members) and home appliance parts.
- the automobile exterior member of the present invention is a molded body obtained by injection molding or press molding of the polypropylene resin composition of the present invention.
- the automotive exterior member of the present invention (and the molded body for other uses) preferably has a linear expansion coefficient in the flow direction (MD) and the orthogonal direction (TD) of preferably 2.5 ⁇ 10 ⁇ 5 / ° C. or more. 0.0 ⁇ 10 ⁇ 5 / ° C. or less.
- This linear expansion coefficient is a value obtained by measurement by the TMA method in a measurement range of ⁇ 30 ° C. to 80 ° C.
- the surface impact strength at ⁇ 40 ° C. of the molded article of the polypropylene resin composition of the present invention which is not coated is preferably 10 J or more. More preferably, it is 12 J or more, and particularly preferably 15 J or more.
- the molded product obtained from the polypropylene resin composition of the present invention exhibits a low coefficient of linear expansion in a wide temperature range from an extremely cold environment to a hot environment, and the resistance of the propylene resin composition that has been considered to be weak under extreme cold. Impact (surface impact) is also manifested at the same time. Therefore, it is suitable for a molding application used in an environment with a large temperature change, such as an automobile interior / exterior member, particularly an automobile exterior member.
- Specific examples of automobile exterior members include bumpers, side moldings, back doors, fenders, and back panels.
- Average particle size of inorganic filler Based on JIS R1620 and JIS R1622, the particle size value of the cumulative amount 50 mass% read from the particle size cumulative curve measured by the laser diffraction method was defined as the average particle size.
- the solid part was collected by hot filtration, and the solid part was resuspended in 275 mL of titanium tetrachloride, and then heated again at 110 ° C. for 2 hours. After completion of the reaction, the solid part was again collected by hot filtration, and washed thoroughly with decane and hexane at 110 ° C. until no free titanium compound was detected in the solution.
- this free titanium compound was confirmed by the following method. 10 mL of the supernatant of the solid catalyst component was collected with a syringe and charged into a 100 mL branched Schlenk that had been previously purged with nitrogen. Next, the solvent hexane was dried in a nitrogen stream, and further vacuum-dried for 30 minutes. To this, 40 mL of ion-exchanged water and 10 mL of (1 + 1) sulfuric acid were charged and stirred for 30 minutes. This aqueous solution is transferred to a 100 mL volumetric flask through a filter paper.
- the solid titanium catalyst component prepared as described above was stored as a decane slurry, but a part thereof was dried for the purpose of examining the catalyst composition.
- the composition of the solid titanium catalyst component thus obtained was 2.3 mass% titanium, 61 mass% chlorine, 19 mass% magnesium, and 12.5 mass% DIBP.
- pre-polymerization catalyst 100 g of the above solid titanium catalyst component, 131 mL of triethylaluminum, 37.3 ml of diethylaminotriethoxysilane, and 14.3 L of heptane were inserted into an autoclave with a stirrer having an internal volume of 20 L, and an internal temperature of 15-20 While maintaining the temperature at 1000 ° C., 1000 g of propylene was inserted and reacted while stirring for 120 minutes. After completion of the polymerization, the solid component was precipitated, and the supernatant was removed and washed with heptane twice.
- the obtained prepolymerization catalyst was resuspended in purified heptane, and the concentration was adjusted with heptane so that the solid catalyst component concentration was 1.0 g / L to obtain a prepolymerization catalyst slurry.
- the obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 100 L and further polymerized. Polymerization was carried out at a polymerization temperature of 68 ° C. and a pressure of 3.36 MPa / G by supplying propylene in an amount of 45 kg / hour and hydrogen in a gas phase portion of 8.8 mol%.
- the obtained slurry was transferred to a transfer pipe having an internal volume of 2.4 L, and the slurry was gasified to perform gas-solid separation. Thereafter, the polypropylene homopolymer powder was sent to a gas phase polymerization vessel having an internal volume of 480 L to carry out ethylene / propylene block copolymerization.
- the polymerization was carried out at a polymerization temperature of 70 ° C. and a pressure of 1.40 MPa / G.
- the propylene / ethylene block copolymer (A-1) thus obtained had an MFR (230 ° C., 2.16 kg load) of 80 g / 10 min, and a decane-soluble part (propylene / ethylene copolymer component).
- the amount of (a1) is 7% by mass
- the amount of decane insoluble part (propylene homopolymer component) (a2) is 93% by mass
- the intrinsic viscosity [ ⁇ ] of the decane insoluble part (a2) is 7. 5 (dl / g).
- the obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 500 L and further polymerized.
- propylene was supplied at 30 kg / hour and hydrogen was supplied so that the hydrogen concentration in the gas phase was 3.9 mol%, and polymerization was carried out at a polymerization temperature of 74.5 ° C. and a pressure of 3.4 MPa / G.
- the obtained slurry was sent to a vessel polymerization vessel with a stirrer having an internal volume of 500 L and further polymerized.
- Polymerization was carried out at a polymerization temperature of 73 ° C. and a pressure of 3.4 MPa / G by supplying 20 kg / hour of propylene and hydrogen so that the hydrogen concentration in the gas phase was 3.4 mol%.
- the obtained slurry was deactivated and vaporized, followed by gas-solid separation.
- the resulting propylene homopolymer was vacuum dried at 80 ° C.
- the MFR (230 ° C., 2.16 kg load) of the propylene homopolymer (B-2) thus obtained was 210 g / 10 min.
- the obtained slurry was sent to a vessel polymerization vessel equipped with a stirrer having an internal volume of 100 L and further polymerized. Polymerization was carried out at a polymerization temperature of 70 ° C. and a pressure of 3.28 MPa / G by supplying propylene at 45 kg / hour and hydrogen at a gas phase of 3.2 mol%.
- the obtained propylene homopolymer was vacuum dried at 80 ° C.
- the MFR (230 ° C., 2.16 kg load) of the propylene homopolymer (B-1) thus obtained was 30 g / 10 minutes.
- talc (D-1) to (D-4) were used as the inorganic filler (D).
- 1,2 cyclohexanedicarboxylate calcium salt (trade name: HyperformfHPN-20E, manufactured by Milliken Japan Co., Ltd.) was used as the nucleating agent (E-1).
- Table 1 shows the physical properties of the injection-molded bodies (test pieces) produced from the obtained polypropylene resin compositions.
- the molded products of Examples 1 to 4 had a smaller linear expansion coefficient (excellent in dimensional stability) than the molded products of Comparative Examples 1 and 2. Moreover, the molded bodies of Examples 1, 3 and 4 exhibited surface impact strength (DuPont impact strength) at a low temperature in a well-balanced manner as compared with the molded body of Comparative Example 3.
- the molded product of Comparative Example 1 is considered to have failed to reduce the linear expansion coefficient because the amount of the ethylene / ⁇ -olefin copolymer (C-1) is small. In the molded product of Comparative Example 2, the amount of talc (D-1) was small, so the linear expansion coefficient could not be lowered.
- the molded product of Comparative Example 3 showed excellent rigidity and low linear expansion coefficient, but the surface impact properties at low temperatures were significantly inferior because the average particle size and aspect ratio of talc (D-4) were too large. . Although such a molded product can avoid gap quality defects, it is expected that it will be difficult to avoid damage to the outer skin of the automobile due to collisions of small pieces such as ice fragments to the vehicle body that are often encountered when the vehicle is traveling in extreme cold.
- the polypropylene resin composition of the present invention is useful, for example, as a molded body material in various fields such as automobile interior and exterior members such as bumpers, side moldings, back doors, fenders, back panels, household items, and home appliance parts. In particular, it can be suitably used for automobile exterior member applications.
Abstract
Description
メルトフローレート(230℃、2.16kg荷重)が10~500g/10分であるプロピレン単独重合体(B)0~30質量部、
エチレンと炭素原子数が4~8のα-オレフィンとのランダム共重合体であり、密度が0.850~0.890g/cm3、メルトフローレート(230℃、2.16kg荷重)が0.5~30g/10分であるエチレン・α-オレフィン共重合体(C)23~30質量部、および、
平均粒子径が3.0μmを超え、5.0μm未満である無機充填剤(D)30~40質量部
[但し、成分(A)~(D)の合計量を100質量部とする。]
を含有するポリプロピレン系樹脂組成物。
[3]無機充填剤(D)がタルクであり、そのアスペクト比が3以上15未満である前記[1]または[2]に記載のポリプロピレン系樹脂組成物。
[4]さらに核剤(E)を、成分(A)~(D)の合計100質量部に対して0.05~0.5質量部含む前記[1]~[3]のいずれかに記載のポリプロピレン系樹脂組成物。
[5]JISK5600-5-3に準拠したデュポン式面衝撃試験において、塗装を施していないポリプロピレン系樹脂組成物の成形体からなる試験片の-40℃の面衝撃強度が10J以上である前記[1]~[4]のいずれかに記載のポリプロピレン系樹脂組成物。
[6]自動車外装部材に用いられる前記[1]~[5]のいずれかに記載のポリプロピレン系樹脂組成物。
[7]前記[6]に記載のポリプロピレン系樹脂組成物を射出成型もしくはプレス成型して得られる自動車外装部材。
本発明に用いるプロピレン系重合体(A)は、メルトフローレート(230℃、2.16kg荷重)が50~150g/10分、デカン可溶部量が6質量%以上であるプロピレン系重合体である。
オレフィン重合用触媒を構成する固体状チタン触媒成分(I)は、例えば、チタン、マグネシウム、ハロゲン及び必要に応じて電子供与体を含む。この固体状チタン触媒成分(I)には公知の成分を制限無く用いることができる。
Ti(OR)gX4-g
(式中、Rは炭化水素基であり、Xはハロゲン原子であり、gは0≦g≦4である。)
(P-1)マグネシウム化合物及びアルコール等の電子供与体成分(1)からなる固体状付加物と、後述する電子供与体成分(2)と、液状状態のチタン化合物とを、不活性炭化水素溶媒共存下、懸濁状態で接触させる方法。
(P-2)マグネシウム化合物及び電子供与体成分(1)からなる固体状付加物と、電子供与体成分(2)と、液状状態のチタン化合物とを、複数回に分けて接触させる方法。
(P-3)マグネシウム化合物及び電子供与体成分(1)からなる固体状付加物と、電子供与体成分(2)と、液状状態のチタン化合物とを、不活性炭化水素溶媒共存下、懸濁状態で接触させ、且つ複数回に分けて接触させる方法。
(P-4)マグネシウム化合物及び電子供与体成分(1)からなる液状状態のマグネシウム化合物と、液状状態のチタン化合物と、電子供与体成分(2)とを接触させる方法。
有機金属化合物触媒成分(II)は、周期表の第1族、第2族及び第13族から選ばれる金属元素を含む成分である。例えば、第13族金属を含む化合物(有機アルミニウム化合物等)、第1族金属とアルミニウムとの錯アルキル化物、第2族金属の有機金属化合物等を用いることができる。中でも、有機アルミニウム化合物が好ましい。
RnSi(OR’)4-n
(式中、R及びR’は炭化水素基であり、nは0<n<4の整数である。)
Si(ORa)3(NRbRc)
RNSi(ORa)3
プロピレン系重合体(A)の好ましい態様であるプロピレン・エチレンブロック共重合体は、上述したオレフィン重合用触媒の存在下にプロピレンを重合し、次いでプロピレンとエチレンを共重合させるか、又は予備重合させて得られる予備重合触媒の存在下にプロピレンを重合し、次いでプロピレンとエチレンの共重合を行う等の方法で製造できる。
(重合工程1)
固体状チタン触媒成分の存在下でプロピレンを重合し、プロピレン単独重合体成分を製造する工程(プロピレン単独重合体製造工程)。
(重合工程2)
固体状チタン触媒成分の存在下でプロピレン及びエチレンを共重合してエチレン・プロピレン共重合体成分を製造する工程(共重合体ゴム製造工程)。
本発明に用いるプロピレン単独重合体(B)は、メルトフローレート(230℃、2.16kg荷重)が10~500g/10分であるプロピレン単独重合体である。
本発明に用いるエチレン・α-オレフィン共重合体(C)は、エチレンと炭素原子数が4~8のα-オレフィンとのランダム共重合体であり、密度が0.850~0.890g/cm3、メルトフローレート(230℃、2.16kg荷重)が0.5~30g/10分であるエチレン・α-オレフィン共重合体である。このエチレン・α-オレフィン共重合体(C)は、他成分との相乗効果によって、成形体の寸法安定性の向上(線膨張係数の低減)に寄与することが予想されると共に、その他の物性の向上にも寄与し成形品に高度な物性バランスが発現する。
本発明に用いる無機充填剤(D)は、平均粒子径が3.0μmを超え、5.0μm未満である無機充填剤である。
本発明のポリプロピレン系樹脂組成物は、本発明の目的を損なわない範囲で、必要に応じてさらに核剤(E)を含有してもよい。
本発明のポリプロピレン系樹脂組成物は、プロピレン系重合体(A)5~47質量部、プロピレン単独重合体(B)0~30質量部、エチレン・α-オレフィン共重合体(C)23~30質量部、および、無機充填剤(D)30~40質量部[但し、成分(A)~(D)の合計量を100質量部とする。]を含有する。
本発明の自動車外装部材は、本発明のポリプロピレン系樹脂組成物を射出成型もしくはプレス成型して得られる成形体である。
ISO 1133に準拠し、試験荷重2.16kg、試験温度230℃の条件で測定した。
サンプル約20mgをデカリン15mlに溶解し、135℃のオイルバス中で比粘度ηspを測定した。このデカリン溶液にデカリン溶媒を5ml追加して希釈し、その後同様にして比粘度ηspを測定した。この希釈操作をさらに2回繰り返し、濃度(C)を0に外挿した時のηsp/Cの値を極限粘度[η]として求めた。
[η]=lim(ηsp/C) (C→0)
ガラス製の測定容器に試料[成分(A)]約3g(10-4gの単位まで測定した。また、この質量を下式においてx2(g)と表した。)、n-デカン500ml、およびn-デカンに可溶な耐熱安定剤を少量装入し、窒素雰囲気下、スターラーで攪拌しながら2時間で150℃に昇温して試料を溶解させ、150℃で2時間保持した後、8時間かけて23℃まで徐冷した。得られた析出物を含む液を、磐田ガラス社製25G-4規格のグラスフィルターで減圧ろ過した。ろ液の100mlを採取し、これを減圧乾燥してデカン可溶成分の一部を得、この質量を10-4gの単位まで測定した(この質量を下式においてx1(g)と表した)。この測定値を用いて、室温(すなわち23℃)におけるデカン可溶部量(Dsol)および不溶部量(Dinsol)を下記式によって決定した。
Dsol(質量%)=100×(500×x1)/(100×x2)
Dinsol(質量%)=100-Dsol
ASTM D790に準拠し、以下の条件で測定した。
温度:23℃
試験片:127mm(長さ)×12.7mm(幅)×6.35mm(厚み)
曲げ速度:30mm/min
スパン間:100cm
ASTM D 696に準拠し、TMA法(測定範囲-30~80℃)にて評価した。具体的には、長さ240mm、幅80mm、厚み3mmの金型キャビティーを用いて樹脂温度210℃、金型温度40℃で射出成形して平板を得て、これを10×5×3mm厚の形状に切り出し、試験片として用いた。
JIS K5600-5-3に準拠し、-10℃、-20℃、-30℃及び-40℃の各温度で、塗装を施していない試験片の面衝撃強度を測定した。
JIS R1620およびJIS R1622に準拠し、レーザー回折法によって測定した粒度累積曲線から読み取った累積量50質量%の粒径値を平均粒径とした。
電子顕微鏡を用いて写真撮影を行い、粉体の長径と厚みを測定し、平均値を求め、平均粒径/平均厚みの比からアスペクト比を求めた。
(1)固体状チタン触媒成分の調製
無水塩化マグネシウム95.2g、デカン442mLおよび2-エチルヘキシルアルコール390.6gを130℃で2時間加熱反応を行って均一溶液とし、この溶液中に無水フタル酸21.3gを添加し、さらに130℃にて1時間攪拌混合を行い、無水フタル酸を溶解させた。
前記の固体状チタン触媒成分100g、トリエチルアルミニウム131mL、ジエチルアミノトリエトキシシラン37.3ml、ヘプタン14.3Lを内容量20Lの攪拌機付きオートクレーブに挿入し、内温15~20℃に保ちプロピレンを1000g挿入し、120分間攪拌しながら反応させた。重合終了後、固体成分を沈降させ、上澄み液の除去およびヘプタンによる洗浄を2回行った。得られた前重合触媒を精製ヘプタンに再懸濁して、固体触媒成分濃度で1.0g/Lとなるようヘプタンにより濃度調整を行って、前重合触媒スラリーを得た。
内容量58Lのジャケット付循環式管状重合器にプロピレンを43kg/時間、水素を256NL/時間、前記(2)で製造した前重合触媒スラリーを固体状チタン触媒成分として0.49g/時間、トリエチルアルミニウム4.5mL/時間、ジエチルアミノトリエトキシシラン1.8mL/時間で連続的に供給し、気相の存在しない満液の状態にて重合した。管状重合器の温度は70℃であり、圧力は3.57MPa/Gであった。
まず、製造例1の(1)固体状チタン触媒成分の調製、(2)前重合触媒の製造と同様にして前重合触媒スラリーを得た。
内容量1000Lの攪拌機付きベッセル重合器に、プロピレンを131kg/時間、前重合触媒スラリーを遷移金属触媒成分として0.70g/時間、トリエチルアルミニウム19.6mL/時間、ジエチルアミノトリエトキシシラン4.2mL/時間を連続的に供給し、水素を気相部の水素濃度が5.3mol%になるように供給し、重合温度75℃、圧力3.5MPa/Gで重合を行った。
製造例1の(1)固体状チタン触媒成分の調製と同様にして固体状チタン触媒成分を得た。
固体状チタン触媒成分100g、トリエチルアルミニウム39.3mL、ヘプタン100Lを内容量200Lの攪拌機付きオートクレーブに挿入し、内温15~20℃に保ちプロピレンを600g挿入し、60分間攪拌しながら反応させて、前重合触媒スラリーを得た。
内容量58Lのジャケット付循環式管状重合器にプロピレンを43kg/時間、水素を177NL/時間、(2)で製造した前重合触媒スラリーを固体状チタン触媒成分として0.58g/時間、トリエチルアルミニウム3.1ml/時間、ジシクロペンチルジメトキシシラン3.3ml/時間で連続的に供給し、気相の存在しない満液の状態にて重合した。管状重合器の温度は70℃であり、圧力は3.53MPa/Gであった。
タルク(D-1):
平均粒径(レーザー回折法)=4.3μm、アスペクト比(SEM採寸)=6.7
タルク(D-2):
平均粒径(レーザー回折法)=3.7μm、アスペクト比(SEM採寸)=9.0
タルク(D-3):
平均粒径(レーザー回折法)=4.5μm、アスペクト比(SEM採寸)=9.0
タルク(D-4):
平均粒径(レーザー回折法)=12μm、アスペクト比(SEM採寸)=15.3
プロピレン系重合体(A)、プロピレン単独重合体(B)、エチレン・α-オレフィン共重合体(C)、無機充填剤(D)および核剤(E)を、表1に示す配合量で混合し、二軸押出機((株)日本製鋼所製、TEX(登録商標)30α)により、シリンダ温度180℃、スクリュー回転750rpm、押出し量60kg/hの条件で押出し、ポリプロピレン系樹脂組成物を得た。
Claims (7)
- メルトフローレート(230℃、2.16kg荷重)が50~150g/10分、デカン可溶部量が6質量%以上であるプロピレン系重合体(A)5~47質量部、
メルトフローレート(230℃、2.16kg荷重)が10~500g/10分であるプロピレン単独重合体(B)0~30質量部、
エチレンと炭素原子数が4~8のα-オレフィンとのランダム共重合体であり、密度が0.850~0.890g/cm3、メルトフローレート(230℃、2.16kg荷重)が0.5~30g/10分であるエチレン・α-オレフィン共重合体(C)23~30質量部、および、
平均粒子径が3.0μmを超え、5.0μm未満である無機充填剤(D)30~40質量部
[但し、成分(A)~(D)の合計量を100質量部とする。]
を含有するポリプロピレン系樹脂組成物。 - プロピレン系重合体(A)がプロピレンとエチレンから得られるブロック共重合体であり、該共重合体のデカン可溶部の極限粘度[η]が2~9dl/gである請求項1に記載のポリプロピレン系樹脂組成物。
- 無機充填剤(D)がタルクであり、そのアスペクト比が3以上15未満である請求項1または2に記載のポリプロピレン系樹脂組成物。
- さらに核剤(E)を、成分(A)~(D)の合計100質量部に対して0.05~0.5質量部含む請求項1~3のいずれかに記載のポリプロピレン系樹脂組成物。
- JISK5600-5-3に準拠したデュポン式面衝撃試験において、塗装を施していないポリプロピレン系樹脂組成物の成形体からなる試験片の-40℃の面衝撃強度が10J以上である請求項1~4のいずれかに記載のポリプロピレン系樹脂組成物。
- 自動車外装部材に用いられる請求項1~5のいずれかに記載のポリプロピレン系樹脂組成物。
- 請求項6に記載のポリプロピレン系樹脂組成物を射出成型もしくはプレス成型して得られる自動車外装部材。
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WO2023112857A1 (ja) | 2021-12-14 | 2023-06-22 | 株式会社プライムポリマー | ポリプロピレン系樹脂組成物およびその用途 |
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CN114174391B (zh) * | 2019-08-08 | 2023-05-12 | 普瑞曼聚合物株式会社 | 非发泡片和容器 |
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