WO2017033987A1 - 水素化ブロック共重合体並びにこれを用いたポリプロピレン系樹脂組成物及びその成型体 - Google Patents
水素化ブロック共重合体並びにこれを用いたポリプロピレン系樹脂組成物及びその成型体 Download PDFInfo
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- WO2017033987A1 WO2017033987A1 PCT/JP2016/074718 JP2016074718W WO2017033987A1 WO 2017033987 A1 WO2017033987 A1 WO 2017033987A1 JP 2016074718 W JP2016074718 W JP 2016074718W WO 2017033987 A1 WO2017033987 A1 WO 2017033987A1
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- polymer block
- mass
- block copolymer
- hydrogenated block
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- YFRLQYJXUZRYDN-UHFFFAOYSA-K trichloro(methyl)stannane Chemical compound C[Sn](Cl)(Cl)Cl YFRLQYJXUZRYDN-UHFFFAOYSA-K 0.000 description 1
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- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F297/02—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type
- C08F297/04—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F297/02—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type
- C08F297/04—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes
- C08F297/044—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes using a coupling agent
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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
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- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L53/02—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 of vinyl-aromatic monomers and conjugated dienes
- C08L53/025—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 of vinyl-aromatic monomers and conjugated dienes modified
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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
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- C08J2323/10—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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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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
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- 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
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- C08J2323/14—Copolymers of propene
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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
- C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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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
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
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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
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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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
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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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
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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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
- C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
Definitions
- the present invention relates to a hydrogenated block copolymer, a polypropylene resin composition using the same, and a molded product thereof.
- Polypropylene resin compositions are generally used in a wide range of packaging materials, machine parts, automobile parts and the like because of their excellent chemical resistance and mechanical properties. In recent years, development of non-halogen transparent polymer materials has been progressing due to the need for environmental problems. Polypropylene resin compositions are used particularly in the field of sheets, films and tubes. There is a demand for softening and / or making the resin composition transparent.
- Patent Document 1 discloses that “at least two polymer blocks A mainly composed of vinyl aromatic hydrocarbon compound monomer units and at least two polymers mainly composed of hydrogenated butadiene monomer units.
- At least one of the blocks at the terminal is the polymer block B, and the polymer block B at the terminal accounts for 0.1% by weight or more in the hydrogenated block copolymer.
- the proportion of the vinyl aromatic hydrocarbon compound in the hydrogenated block copolymer in the hydrogenated block copolymer exceeds 10% by weight and is less than 1% by weight.
- the average amount of 1 and 2 bonds in the polymer block mainly composed of butadiene monomer units before hydrogenation is 62 mol% or more and less than 99 mol%
- the hydrogenated block copolymer Is the difference ⁇ Tc (Tc1) between the crystallization start temperature (Tc1) of isotactic homopropylene and the crystallization start temperature (Tc2) when 20 wt% of the hydrogenated block copolymer is added to the isotactic homopolypropylene.
- a hydrogenated block copolymer characterized by -Tc2) of 1.5 ° C. or higher is disclosed.
- Patent Documents 2 and 3 disclose a hydrogenated block copolymer containing a styrene block and a butadiene block.
- Molded products of polypropylene resin compositions used in the food packaging field, clothing packaging field, and medical fields such as infusion bags and infusion tubes have heat sealability, flexibility, low anisotropy, transparency, low Stickiness, impact resistance, and the like are required, and further, the balance of each property is required to be good.
- the present invention provides a hydrogenated block capable of imparting a performance excellent in the balance of heat sealability, flexibility, low anisotropy, transparency, low stickiness and impact resistance to a molded body of a polypropylene resin composition. It is an object to provide a copolymer, a polypropylene resin composition using the copolymer, and a molded product thereof.
- the content of the polymer block (S) is 5 to 20% by mass
- the content of the polymer block (B) is 80 to 95% by mass
- the polymer block (B) includes a polymer block (B1) and a polymer block (B2)
- the vinyl bond amount before hydrogenation of the polymer block (B1) is 30 to 60 mol%
- the amount of vinyl bonds before hydrogenation of the polymer block (B2) is more than 60 to 100 mol%
- the content of the polymer block (B1) is 5 to 60% by mass
- the content of the polymer block (B2) is 30 to 85% by mass
- the content of the structure represented by the following formula (1) is 40 to 100% by mass
- the content of the structure represented by the formula (1) is 40 to 90% by mass,
- (SB) n -X Formula (2) (SBSS) Formula (3) (SBSSB3) Formula (4)
- S means the polymer block (S)
- B means the polymer block (B)
- S and B in the formulas (1) to (4) are respectively
- n is an integer of 2 or more
- X represents a coupling residue
- B3 is a conjugate different from the polymer block (B).
- the content of the polymer block (B3) is 0.1 to 10% by mass.
- [5] The hydrogenated block copolymer according to any one of [1] to [4], wherein the content of the structure represented by the formula (1) is 50 to 85% by mass.
- a polypropylene resin composition comprising 10 to 90% by mass of the hydrogenated block copolymer according to any one of [1] to [5] and 10 to 90% by mass of a polypropylene resin.
- a molded article comprising the polypropylene resin composition according to [6] or [7].
- [9] A sheet comprising the polypropylene resin composition according to [6] or [7].
- hydrogen capable of imparting a performance excellent in a balance of heat sealability, flexibility, low anisotropy, transparency, low stickiness, and impact resistance to a molded body of a polypropylene resin composition. It is possible to provide a block copolymer, a polypropylene resin composition using the block copolymer, and a molded product thereof.
- the present embodiment a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail.
- the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents.
- the present invention can be appropriately modified within the scope of the gist.
- the hydrogenated block copolymer of the present embodiment has in its molecule a polymer block (S) mainly composed of vinyl aromatic compound units and a polymer block (B) mainly composed of conjugated diene compound units.
- a hydrogenated block copolymer comprising: In the hydrogenated block copolymer, the content of the polymer block (S) is 5 to 20% by mass, the content of the polymer block (B) is 80 to 95% by mass,
- the polymer block (B) includes a polymer block (B1) and a polymer block (B2), and the vinyl bond amount before hydrogenation of the polymer block (B1) is 30 to 60 mol%, The amount of vinyl bonds before hydrogenation of the polymer block (B2) is more than 60 to 100 mol%,
- the content of the polymer block (B1) is 5 to 60% by mass, the content of the polymer block (B2) is 30 to 85% by mass,
- the content of the structure represented by the following formula (1) is 40 to 100% by mass,
- (SB) Formula (1) In the formula (1), S means the polymer block (S) and B means the polymer block (B).)
- the hydrogenation rate of the hydrogenated block copolymer is 70 mol%
- “Mainly” in the present embodiment means that the target monomer unit is contained in an amount of 91% by mass or more in the target polymer block.
- the content of vinyl aromatic compound units is 91% by mass or more
- the content of conjugated diene compound units is 91% by mass or more. From the viewpoint of heat sealability, flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc.
- the content of the vinyl aromatic compound unit in (S) is preferably 92% by mass or more, more preferably 93% by mass or more, still more preferably 95% by mass or more, and still more preferably 100% by mass.
- the content of the conjugated diene compound in the polymer block (B) mainly composed of the conjugated diene compound unit is preferably 92% by mass or more, more preferably 93% by mass or more, and further preferably 95% by mass or more. More preferably, it is 100 mass%.
- the content of the conjugated diene compound unit in the polymer block (B1) mainly composed of the conjugated diene compound unit and the polymer block (B2) mainly composed of the conjugated diene compound unit is preferably independently 91 mass. % Or more, more preferably 92% by mass or more, still more preferably 93% by mass or more, still more preferably 95% by mass or more, and further preferably 100% by mass.
- the polymer block (S) mainly composed of vinyl aromatic compound units may contain conjugated diene compound units, and the polymer block (B) mainly composed of conjugated diene compound units includes conjugated diene compound units.
- Each of the polymer block (B1) mainly composed of and the polymer block (B2) mainly composed of the conjugated diene compound unit may contain a vinyl aromatic compound unit.
- the content of the polymer block (S) in the hydrogenated block copolymer is 5 to 20% by mass in the hydrogenated block copolymer.
- the content of the polymer block (S) includes productivity, heat sealability, flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc. of the molded polypropylene resin composition. From the viewpoint, it is preferably 6 to 18% by mass, more preferably 7 to 17% by mass, and still more preferably 8 to 15% by mass in the hydrogenated block copolymer.
- the vinyl aromatic compound unit is a unit composed of a vinyl aromatic compound
- the vinyl aromatic compound is not particularly limited.
- styrene, ⁇ -methylstyrene and 4-methylstyrene are preferable from the viewpoint of availability and productivity, and styrene is more preferable.
- the polymer block (S) may be composed of one kind of vinyl aromatic compound unit or may be composed of two or more kinds of vinyl aromatic compound units.
- the content of the polymer block (B) in the hydrogenated block copolymer is 80 to 95% by mass in the hydrogenated block copolymer.
- the content of the polymer block (B) is determined in terms of productivity, heat sealability, flexibility, low anisotropy, transparency, low stickiness, impact resistance, and the like of the obtained polypropylene resin composition molding. Therefore, the content in the hydrogenated block copolymer is preferably 82 to 94% by mass, more preferably 83 to 93% by mass, and still more preferably 85 to 92% by mass.
- the polymer block (B) of this embodiment includes a polymer block (B1) and a polymer block (B2).
- the amount of vinyl bonds before hydrogenation is 30 to 60 mol%.
- the amount of vinyl bonds before hydrogenation is more than 60 to 100 mol%.
- the “vinyl bond amount before hydrogenation” in the polymer block (B1) and the polymer block (B2) is a 1,4-bond resulting from a conjugated diene compound incorporated in the block copolymer before hydrogenation. (Cis and trans) and 1,2-bond (however, when 3,4-bond is incorporated into the polymer, the total amount of 1,2-bond and 3,4-bond) 1,2-bond amount (mol%) relative to
- the vinyl bond amount before hydrogenation of the polymer block (B1) is 30 to 60 mol%.
- the vinyl bond amount is preferably from 35 to 58 mol%, more preferably from 40 to 57 mol%, still more preferably from 45 to 55 mol%, from the viewpoint of impact resistance of the molded polypropylene resin composition. is there.
- the vinyl bond amount before hydrogenation of the polymer block (B2) is more than 60 to 100 mol%.
- the vinyl bond amount is preferably 65 to 95 mol% from the viewpoints of productivity and heat sealability, flexibility, transparency, low stickiness and low anisotropy of the molded polypropylene resin composition. More preferably, it is 68 to 90 mol%, and further preferably 73 to 85 mol%.
- the conjugated diene compound unit is a unit composed of a conjugated diene compound
- the conjugated diene compound is a diolefin having a pair of conjugated double bonds.
- the conjugated diene compound is not particularly limited.
- 1,3-butadiene, 2-methyl-1,3-butadiene (isoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, Examples include 2-methyl-1,3-pentadiene, 1,3-hexadiene, and farnesene.
- general diolefins include 1,3-butadiene and isoprene.
- Each of the polymer block (B), the polymer block (B1) and the polymer block (B2) may be composed of one kind of conjugated diene compound unit, or composed of two or more kinds of conjugated diene compound units. May be.
- the average vinyl bond amount before hydrogenation of the polymer block (B) is preferably 40 to 98 mol%.
- the “average vinyl bond amount before hydrogenation of the polymer block (B)” is a polymer block (B1) in consideration of the mass ratio of the polymer block (B1) and the polymer block (B2). The average value of the vinyl bond amount before hydrogenation and the vinyl bond amount before hydrogenation of the polymer block (B2).
- the average vinyl bond amount before hydrogenation of the polymer block (B) is Vinyl bond amount before hydrogenation of polymer block (B1) ⁇ (content of polymer block (B1) / sum of contents of polymer blocks (B1) and (B2)) + polymer block (B2) Vinyl bond amount before hydrogenation ⁇ (content of polymer block (B2) / sum of contents of polymer blocks (B1) and (B2)) Can be obtained as
- the average vinyl bond amount before hydrogenation of the polymer block (B) is more from the viewpoints of productivity, flexibility, transparency, low stickiness, impact resistance, etc. of the molded polypropylene resin composition. It is preferably 45 to 95 mol%, more preferably 48 to 91 mol%, and still more preferably 54 to 85 mol%.
- the content of the polymer block (B1) is 5 to 60% by mass in the hydrogenated block copolymer.
- the content of the polymer block (B1) is determined from the viewpoint of heat sealability, flexibility, low anisotropy, transparency, low stickiness and impact resistance of the obtained polypropylene resin composition molding.
- it is preferably 10 to 50% by mass, more preferably 15 to 45% by mass.
- the content of the polymer block (B2) is 30 to 85% by mass in the hydrogenated block copolymer.
- the content of the polymer block (B2) is, in the hydrogenated block copolymer, from the viewpoint of heat sealability, flexibility, anisotropy, transparency and impact resistance of the obtained polypropylene resin composition molded body,
- the amount is preferably 35 to 75% by mass, more preferably 40 to 70% by mass.
- the hydrogenated block copolymer comprises a polymer block (S) mainly composed of vinyl aromatic compound units, a polymer block (B1) mainly composed of conjugated diene compound units, and a conjugated diene compound. It is preferable to have a polymer block (B2) mainly composed of units in this order.
- the content of the structure represented by the following formula (1) in the hydrogenated block copolymer is such that the heat-sealability, flexibility, and low anisotropy of the molded polypropylene resin composition are obtained. From the viewpoint of transparency and low stickiness, it is 40 to 100% by mass.
- SB Formula (1) Heat-sealability, flexibility, low anisotropy of molded polypropylene resin composition obtained, From the viewpoint of transparency, low stickiness, impact resistance, etc., the content of the structure represented by the formula (1) in the hydrogenated block copolymer is preferably 43 to 95% by mass, more preferably 46 to 90% by mass, more preferably 50 to 85% by mass.
- the hydrogenated block copolymer When the hydrogenated block copolymer is coupled, in addition to the diblock which is the structure represented by the formula (1), it is bonded to a linear, branched, radial, etc. via a coupling agent. It may be a mixture containing the hydrogenated block copolymer in an arbitrary ratio.
- the coupling rate in this case can be determined by gel permeation chromatography (hereinafter also referred to as “GPC”) measurement based on the following formula.
- Coupling rate (% by mass) [(total peak area) ⁇ (peak area derived from the structure represented by formula (1))] / (total peak area) ⁇ 100
- the type and amount of the coupling agent can be appropriately adjusted according to the desired weight average molecular weight of the hydrogenated block copolymer. For example, when the coupling ratio of the hydrogenated block copolymer is 0 to 60% by mass, the content of the structure represented by the formula (1) in the hydrogenated block copolymer is 40 to 100% by
- the hydrogenated block copolymer is represented by the above formula (1) from the viewpoint of heat sealability, flexibility, low anisotropy, transparency, and low stickiness of a molded polypropylene resin composition.
- any one of the structures represented by the following formulas (2) to (4) may be contained.
- S means the polymer block (S)
- B means the polymer block (B)
- S and B in the formulas (1) to (4) are respectively
- n is an integer of 2 or more
- X represents a coupling residue
- B3 is a conjugate different from the polymer block (B).
- the content of the polymer block (B3) is 0.1 to 10% by mass.
- the content of the structure represented by the formula (1) in the hydrogenated block copolymer is preferably 40 to 90% by mass, more preferably It is 43 to 95% by mass, more preferably 46 to 90% by mass, and still more preferably 50 to 85% by mass.
- n is preferably 2 in formula (2). ⁇ 4, more preferably 2 or 3, even more preferably 2.
- the hydrogenation rate of the hydrogenated block copolymer is 70 mol% or more.
- the “hydrogenation rate of the hydrogenated block copolymer” in the present embodiment refers to the hydrogenation rate (mol%) of all conjugated diene compound units contained in the hydrogenated block copolymer.
- the hydrogenation rate of the hydrogenated block copolymer is: Preferably it is 85 mol% or more, More preferably, it is 90 mol% or more, More preferably, it is 95 mol% or more.
- the hydrogenation rate of the hydrogenated block copolymer can be controlled by, for example, the amount of catalyst at the time of hydrogenation, and the hydrogenation rate is determined by, for example, the amount of catalyst at the time of hydrogenation, the amount of hydrogen feed, the pressure and temperature, etc. Can be controlled.
- the melt flow rate (MFR; conforming to ISO 1133) of the hydrogenated block copolymer is such as processability, flexibility, low anisotropy, transparency and low stickiness of the molded polypropylene resin composition. From the viewpoint, it is preferably 0.1 to 25.0 g / 10 minutes, more preferably 0.5 to 20.0 g / 10 minutes, still more preferably 1.0 to 15.0 g / 10 minutes, and still more preferably 1. 5 to 10.0 g / 10 or less.
- the weight average molecular weight (Mw) of the hydrogenated block copolymer of the present embodiment is not particularly limited, but is, for example, 70,000 to 500,000, and the heat sealability of the resulting molded product of the polypropylene resin composition From the viewpoints of flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc., preferably 90,000 to 400,000, more preferably 100,000 to 300,000, still more preferably 130, 000 to 300,000, more preferably 140,000 to 280,000, and even more preferably 150,000 to 250,000.
- the molecular weight distribution of a single peak measured by GPC of the hydrogenated block copolymer of this embodiment is preferably 1.30 or less, more preferably 1.20 or less, still more preferably 1.15 or less, and even more preferably Is 1.10 or less.
- the weight average molecular weight (Mw) of the hydrogenated block copolymer is a calibration curve obtained by measuring the molecular weight of the chromatogram peak obtained by measurement by GPC from the measurement of commercially available standard polystyrene (using the peak molecular weight of standard polystyrene). The weight average molecular weight (Mw) determined based on (preparation). Similarly to the weight average molecular weight (Mw), the molecular weight distribution of the hydrogenated block copolymer can be obtained from the measurement by GPC, and the molecular weight distribution is a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn). .
- the hydrogenated block copolymer of the present embodiment is produced by performing polymerization using an organic alkali metal compound as a polymerization initiator in an organic solvent, performing a coupling reaction if desired, and then performing a hydrogenation reaction. Can do.
- the mode of polymerization may be batch polymerization, continuous polymerization, or a combination thereof. From the viewpoint of obtaining a hydrogenated block copolymer having a narrow molecular weight distribution and high strength, a batch polymerization method is preferred.
- the polymerization temperature is generally 0 to 150 ° C., preferably 20 to 120 ° C., more preferably 40 to 100 ° C.
- the polymerization time varies depending on the target polymer, but is generally within 24 hours, preferably 0.1 to 10 hours. From the viewpoint of obtaining a hydrogenated block copolymer having a narrow molecular weight distribution and high strength, it is more preferably 0.5 to 3 hours.
- the atmosphere of the polymerization system is not particularly limited as long as it is within a range of pressure sufficient to maintain nitrogen and the solvent in a liquid phase. It is preferred that no impurities that inactivate the polymerization initiator and the living polymer, such as water, oxygen, carbon dioxide gas, etc., are present in the polymerization system.
- organic solvent examples include, but are not limited to, aliphatic hydrocarbons such as n-butane, isobutane, n-pentane, n-hexane, n-heptane and n-octane; cyclohexane, cycloheptane and methylcyclopentane.
- aliphatic hydrocarbons such as n-butane, isobutane, n-pentane, n-hexane, n-heptane and n-octane
- cyclohexane cycloheptane and methylcyclopentane
- alicyclic hydrocarbons such as benzene, xylene, toluene and ethylbenzene.
- an organic lithium compound is preferable.
- organic alkali metal compounds do not include compounds corresponding to alkali metal alkoxides or alkali metal compounds.
- Examples of the organic lithium compound include organic monolithium compounds, organic dilithium compounds, and organic polylithium compounds.
- the organic lithium compound is not particularly limited.
- ethyllithium, n-propyllithium, isopropyllithium, n-butyllithium, sec-butyllithium, t-butyllithium, phenyllithium, hexamethylenedilithium, butadienyl Examples include lithium and isopropenyl dilithium.
- n-butyllithium and sec-butyllithium are preferable from the viewpoint of polymerization activity.
- the amount of the organic alkali metal compound used as the polymerization initiator depends on the molecular weight of the target hydrogenated block copolymer, but is generally in the range of 0.01 to 0.5 phm (parts by mass per 100 parts by mass of monomer). Preferably, it is within the range of 0.03 to 0.3 phm, more preferably within the range of 0.05 to 0.15 phm.
- the amount of vinyl bonds before each hydrogenation in the hydrogenated block copolymer can be adjusted by using a Lewis base such as a compound having an ether structure or an amine structure in the molecule as a vinylating agent. Moreover, it can be set as the vinyl bond amount before each target hydrogenation by adjusting the usage-amount of a vinylating agent.
- a vinylating agent and an alkali metal alkoxide which will be described later, in two or more conditions, polymer blocks having different vinyl bond amounts before hydrogenation can be produced in the polymer block (B).
- vinylating agent examples include ether compounds and tertiary amine compounds.
- a vinylating agent may be used independently and may use 2 or more types together.
- the ether compound may be a compound having two or more oxygen atoms.
- a linear ether compound For example, Dialkyl ether compounds of ethylene glycol, such as dimethyl ether, diethyl ether, diphenyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether; Diethylene glycol dimethyl ether, diethylene glycol diethyl And dialkyl ether compounds of diethylene glycol such as ether and diethylene glycol dibutyl ether.
- the cyclic ether compound is not particularly limited, and examples thereof include tetrahydrofuran, dioxane, 2,5-dimethyloxolane, 2,2,5,5-tetramethyloxolane, 2,2-bis (2-oxolanyl) propane and Examples include furfuryl alcohol.
- the tertiary amine compound is not particularly limited, and examples thereof include pyridine, N, N, N ′, N′-tetramethylethylenediamine, tributylamine, tetramethylpropanediamine, 1,2-dipiperidinoethane, and the like. And bis [2- (N, N-dimethylamino) ethyl] ether.
- An ether compound may be used independently and may use 2 or more types together.
- a compound having two amines is preferable. Among these, those having a structure exhibiting symmetry in the molecule are preferable, and as the tertiary amine compound having the structure, N, N, N ′, N′-tetramethylethylenediamine, bis [2- (N, N-dimethylamino) ethyl] ether and 1,2-dipiperidinoethane are preferred.
- a tertiary amine compound may be used independently and may use 2 or more types together.
- the hydrogenated block copolymer may be copolymerized in the presence of a vinylating agent, an organolithium compound as a polymerization initiator, and an alkali metal alkoxide.
- the alkali metal alkoxide is a compound represented by the general formula MOR (wherein M is an alkali metal and R is an alkyl group).
- the alkali metal of the alkali metal alkoxide is preferably sodium or potassium from the viewpoints of high vinyl bond content, narrow molecular weight distribution, high polymerization rate, and high block rate.
- the alkali metal alkoxide is not particularly limited, and examples thereof include sodium alkoxide, lithium alkoxide, and potassium alkoxide having an alkyl group having 2 to 12 carbon atoms, preferably sodium alkoxide having an alkyl group having 3 to 6 carbon atoms.
- potassium alkoxide more preferably sodium-t-butoxide, sodium-t-pentoxide, potassium-t-butoxide and potassium-t-pentoxide.
- sodium tert-butoxide and sodium tert-pentoxide are preferable.
- the molar ratio of the vinylating agent to the organolithium compound (vinylating agent). / Organic lithium compound) is adjusted to 0.2 to 3.0, and the molar ratio of alkali metal alkoxide to organic lithium compound (alkali metal alkoxide / organic lithium compound) is adjusted to 0.01 to 0.3. Is preferred.
- the molar ratio of the vinylating agent / organolithium compound is preferably 0.2 or more from the viewpoint of a high vinyl bond amount and a high polymerization rate, and preferably 3.0 or less from the viewpoint of obtaining a narrow molecular weight distribution and high hydrogenation activity.
- the molar ratio of alkali metal alkoxide / organolithium compound is 0.01 or more from the viewpoint of high vinyl bond content, high polymerization rate and high block ratio, and 0.3 or less from the viewpoint of obtaining a narrow molecular weight distribution and high hydrogenation activity. It is preferable to do.
- the polymerization rate can be improved and hydrogenation in the target hydrogenated block copolymer can be achieved.
- the previous vinyl bond amount can be increased, the molecular weight distribution can be narrowed, and the block rate tends to be improved.
- the low anisotropy, flexibility, transparency, smoothness, low stickiness, etc. of the molded product of the polypropylene resin composition tend to be better.
- the molar ratio of the vinylating agent / organolithium compound is preferably 0.8 or more from the viewpoint of a high vinyl bond amount and a high polymerization rate, and preferably 2.5 or less from the viewpoint of a narrow molecular weight distribution and high hydrogenation activity. More preferably, it is 1.0 to 2.0.
- the molar ratio of the alkali metal alkoxide / organolithium compound is preferably 0.02 or more from the viewpoint of a high vinyl bond amount, a high polymerization rate and a high block ratio, and is 0.2 or less from the viewpoint of a narrow molecular weight distribution and high hydrogenation activity. It is preferably 0.03 to 0.1, more preferably 0.03 to 0.08.
- the molar ratio of the alkali metal alkoxide / vinylating agent is preferably 0.010 or more from the viewpoint of a high vinyl bond amount, a high polymerization rate and a high block ratio, realizing a narrow molecular weight distribution and high hydrogenation. From the viewpoint of obtaining activity, it is preferably 0.100 or less.
- the molar ratio of alkali metal alkoxide / vinylating agent is more preferably 0.012 to 0.080, still more preferably 0.015 to 0.060, and still more preferably 0.015 to 0.050.
- a deactivator for the vinylating agent can also be used as a method for producing blocks having different vinyl bond amounts before hydrogenation in the polymer block (B).
- Deactivators include alkyl metal compounds, such as alkylaluminums having 1 to 20 carbon atoms per alkyl substituent, zinc and magnesium.
- An alkyl metal compound may be used independently and may use 2 or more types together.
- the coupling reaction conditions vary depending on the target polymer, but the reaction temperature is generally 0 ° C. to 150 ° C., and the reaction time is generally within 24 hours.
- the coupling agent used for producing the hydrogenated block copolymer of the present embodiment is not particularly limited, and conventionally known coupling agents can be applied.
- the bifunctional coupling agent include trimethoxysilane, triethoxysilane, tetramethoxysilane, tetraethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, dichlorodimethoxysilane, dichlorodiethoxysilane, trichloromethoxysilane, and trichloroethoxy.
- alkoxysilane compounds such as silane
- dihalogen compounds such as dichloroethane, dibromoethane, dimethyldichlorosilane and dimethyldibromosilane
- acid esters such as methyl benzoate, ethyl benzoate, phenyl benzoate and phthalates.
- Examples of the trifunctional or higher polyfunctional coupling agent include trimethoxysilane hydride, methyltrimethoxysilane, octyltrimethoxysilane, isobutyltrimethoxysilane, tetrakis 2-butoxyethyl orthosilicate, tetrabutoxy orthosilicate, and trivalent or higher
- a polyhydric epoxy compound such as epoxidized soybean oil, diglycidyl bisphenol A and 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane; a general formula R 4-n SiX n (where R represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen, and n represents an integer of 3 to 4).
- methylsilyl trichloride, t-butylsilyltrichloride and tetra Silicon chloride and chlorine in these compounds are replaced by bromine
- tin compounds include methyltin trichloride, t-butyltin trichloride, and tin tetrachloride.
- the coupling agent may be dimethyl carbonate or diethyl carbonate.
- the coupling agent is a bifunctional coupling agent from the viewpoint of low anisotropy, flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc. of the molded polypropylene resin composition.
- dimethyldimethoxysilane and ethyl benzoate being preferred.
- the hydrogenation method is not particularly limited.
- the hydrogenated block copolymer obtained by the above-described coupling reaction is supplied with hydrogen in the presence of a hydrogenation catalyst.
- a hydrogenated block copolymer in which the double bond residue of the conjugated diene compound unit is hydrogenated can be obtained.
- the hydrogenation reaction can be performed either in a batch process, a continuous process, or a combination thereof.
- the hydrogenation rate can be controlled by, for example, the catalyst amount of the hydrogenation catalyst.
- the hydrogenation rate can be controlled by, for example, the catalyst amount of the hydrogenation catalyst, the hydrogen feed amount, pressure and / or temperature.
- titanocene compounds include, but are not limited to, compounds described in JP-A-8-109219, and examples thereof include biscyclopentadienyl titanium dichloride and monopentamethylcyclopentanedienyl titanium trichloride.
- a compound having at least one ligand having a dichloropentadienyl skeleton, an indenyl skeleton, or a fluorenyl skeleton may be substituted or unsubstituted.
- a reducible organometallic compound For example, organic alkali metal compounds, such as organolithium, an organic magnesium compound, an organoaluminum compound, an organoboron compound, and an organozinc compound are mentioned.
- the reaction temperature in the hydrogenation reaction is generally 0 to 200 ° C., preferably 30 to 150 ° C.
- the hydrogen pressure in the hydrogenation reaction is generally in the range of 0.1 to 15 MPa, preferably in the range of 0.2 to 10 MPa, and more preferably in the range of 0.3 to 5 MPa.
- the reaction time in the hydrogenation reaction is generally 3 minutes to 10 hours, preferably 10 minutes to 5 hours.
- pellets of the hydrogenated block copolymer can be produced.
- a method of pelletization for example, a method in which a hydrogenated block copolymer is extruded in a strand form from a single-screw or twin-screw extruder and cut in water with a rotary blade installed on the front surface of the die part; A method in which the hydrogenated block copolymer is extruded into a strand form from an extruder, cooled with water or air, and then cut with a strand cutter; after being melt-mixed with an open roll or a Banbury mixer, formed into a sheet form with a roll; Examples include a method of cutting a sheet into strips and then cutting the pellets into cubic pellets using a pelletizer.
- the size and shape of the hydrogenated block copolymer pellet molding are not particularly limited.
- the hydrogenated block copolymer can be blended with a pellet blocking inhibitor, if necessary, for the purpose of preventing pellet blocking.
- the pellet blocking inhibitor is not particularly limited, and examples thereof include calcium stearate, magnesium stearate, zinc stearate, polyethylene, polypropylene, ethylene bisstearylamide, talc, and amorphous silica. From the viewpoint of the transparency of the obtained polypropylene resin composition and the molded product of the polypropylene resin composition, calcium stearate, polyethylene and polypropylene are preferred.
- the blending amount of the pellet blocking inhibitor is preferably 500 to 6000 ppm, more preferably 1000 to 5000 ppm with respect to the hydrogenated block copolymer.
- the pellet blocking inhibitor is preferably blended in a state of adhering to the pellet surface, but may be included to some extent inside the pellet.
- the polypropylene resin composition of the present embodiment has a hydrogenated block copolymer weight of the present embodiment.
- the blend (a) contains 10 to 90% by mass and the polypropylene resin (b) 10 to 90% by mass. From the viewpoint of low anisotropy and low stickiness of the molded product containing the resulting polypropylene resin composition, the content of the hydrogenated block copolymer (a) in the polypropylene resin composition is 90% by mass or less.
- the content of the hydrogenated block copolymer (a) in the polypropylene resin composition from the viewpoint of heat sealability, flexibility, transparency, impact resistance, etc. of the molded product containing the polypropylene resin composition obtained Is 10% by mass or more. From the viewpoint of heat sealability, flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc.
- the content of the hydrogenated block copolymer (a) is: The content is preferably 5 to 60% by mass, more preferably 10 to 50% by mass, still more preferably 20 to 40% by mass, and the content of the polypropylene resin (b) is preferably 40 to 95% by mass, more preferably It is 50 to 90% by mass, more preferably 60 to 80% by mass.
- polypropylene resin examples include random polypropylene, homopolypropylene, and block polypropylene. Among these, random polypropylene is preferable.
- a polypropylene resin may be used independently and may use 2 or more types together.
- Random polypropylene is a polymer obtained by copolymerization of monomers other than propylene and propylene, and refers to a polymer in which monomers other than propylene are randomly incorporated into the propylene chain and monomers other than propylene are not substantially chained.
- the random polypropylene is not particularly limited as long as the content of propylene units is less than 98% by mass.
- a random copolymer of propylene and ethylene and a random copolymer of propylene and an ⁇ -olefin having 4 to 20 carbon atoms are used. Etc.
- random polypropylene is a random copolymer of propylene and ethylene from the viewpoint of heat sealability, flexibility, low anisotropy, transparency, low stickiness, impact resistance, etc. of a molded product of a polypropylene resin composition.
- Polymer or a random copolymer of propylene and an ⁇ -olefin having 4 to 12 carbon atoms is preferable, and propylene-ethylene random copolymer, propylene-1-butene random copolymer, and propylene-ethylene-1-butene ternary random A copolymer is more preferred.
- the ⁇ -olefin having 4 to 20 carbon atoms is not particularly limited, and examples thereof include 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene and 4-methyl. Examples include 1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicocene.
- the ⁇ -olefin is preferably an ⁇ -olefin having 4 to 12 carbon atoms, more preferably 1-butene, 3-methyl-1-butene, 1-hexene and 4-methyl-1-pentene.
- ⁇ -olefins may be used alone or in combination of two or more. Further, ethylene and an ⁇ -olefin having 4 to 20 carbon atoms may be used in combination.
- the content of the ethylene unit or ⁇ -olefin unit in the random polypropylene is preferably more than 2% by mass and less than 40% by mass, and the content of the propylene unit is preferably more than 60% by mass and less than 98% by mass. .
- the content of ethylene units or ⁇ -olefin units is more preferably more than 2% by mass and not more than 30% by mass, further preferably 2.5 to 25% by mass, and still more preferably 3 to 20% by mass.
- the content of the propylene unit is more preferably 70% by mass or more and less than 98% by mass, still more preferably 75 to 97.5% by mass, and still more preferably 80 to 97% by mass.
- the content of propylene units, the content of ethylene units, and the content of ⁇ -olefin units in random polypropylene can be measured by a carbon nuclear magnetic resonance ( 13 C-NMR) method.
- the melt flow rate (MFR; 230 ° C., conforming to ISO 1133) of the random polypropylene is preferably 1 to 30 g / 10 min, more preferably 1 from the viewpoint of the processability and low stickiness of the obtained polypropylene resin composition. It is ⁇ 25 g / 10 minutes, more preferably 2 to 20 g / 10 minutes, and even more preferably 3 to 15 g / 10 minutes.
- the polypropylene resin composition of this embodiment may be used in combination with other additives depending on the required performance.
- Additives are not particularly limited, for example, flame retardants, stabilizers, colorants, pigments, antioxidants, antistatic agents, dispersants, flow enhancers, mold release agents such as metal stearates, silicone oils, Examples include mineral oil-based softeners, synthetic resin-based softeners, copper damage inhibitors, cross-linking agents, and nucleating agents.
- the polypropylene resin composition of the present embodiment includes, for example, a hydrogenated block copolymer (a), a polypropylene resin (b), and other components added as necessary according to the composition ratio of each component. It can be produced by a method of dry blending, a method of adjusting by an apparatus used for mixing ordinary polymer substances, or the like.
- the mixing apparatus that can be used for the production of the polypropylene resin composition is not particularly limited, and examples thereof include kneading apparatuses such as a Banbury mixer, a lab plast mill, a single screw extruder, and a twin screw extruder. It is preferable to manufacture by the melt mixing method using an extruder from the point of productivity and good kneadability.
- the melting temperature at the time of kneading can be appropriately set, but is generally in the range of 130 to 300 ° C, preferably in the range of 150 to 250 ° C.
- the molded body of the present embodiment includes the polypropylene resin composition of the present embodiment.
- bag, a tube, a medical molded object, a packaging material etc. are mentioned, for example.
- the medical molded body include medical films, medical bags, medical infusion tubes, and the like, and examples of packaging materials include food packaging materials and clothing packaging materials.
- a sheet-like molded body having a thickness of 0.005 mm or more and less than 0.2 mm is referred to as a film
- a sheet-like molded body having a thickness of 0.2 mm or more and 50 mm or less is referred to as a sheet.
- “sheet-like molded product” and “sheet” are used as terms including the film and the sheet.
- the thickness of the sheet of the present embodiment is not particularly limited, but is preferably 0.005 mm to 0.5 mm from the viewpoints of moldability, flexibility, low anisotropy, and the like of the molded product of the polypropylene resin composition. Preferably, it is 0.01 mm to 0.3 mm.
- the manufacturing method of a sheet-like molded object is not specifically limited.
- a method for producing a sheet-like molded body for example, a T-die method and an inflation method can be adopted as an extrusion molding method.
- an inflation method a normal air-cooled inflation molding method, an air-cooled two-stage inflation molding method, a high-speed inflation molding method, and the like. Method and water-cooled inflation molding method can be employed. Blow molding methods such as direct blow and injection blow, and press molding methods can also be employed.
- the T-die method and the inflation method are preferable because of excellent bubble stability and suppression of drawdown.
- the sheet-like molded body of the present embodiment may be a single-layer sheet, but may be a multilayer sheet by laminating other polymers within a range that does not impair the gist of the present invention.
- other polymers include olefin polymers such as polypropylene, polyethylene, ethylene / propylene copolymer rubber (EPM) and ethylene / propylene / non-conjugated diene copolymer rubber (EPDM); polyester elastomer, polyethylene terephthalate and poly Polyester polymers such as butylene terephthalate; polyamide resins such as polyamide 6, polyamide 6 ⁇ 6, polyamide 6 ⁇ 10, polyamide 11, polyamide 12 and polyamide 6 ⁇ 12; acrylic such as polymethyl acrylate and polymethyl methacrylate Polyoxymethylene resins such as polyoxymethylene homopolymers and polyoxymethylene copolymers; styrene homopolymers, acrylonitrile / styrene resins and
- multilayer sheet or film molding methods such as multi-layer T-die method, multi-layer inflation method and extrusion lamination method, wet lamination, dry lamination and press molding, etc.
- Blow molding methods such as multilayer injection blow such as coin injection blow and multilayer direct blow can be employed.
- the molded multilayer laminate may be unstretched or may be uniaxially or biaxially stretched.
- the sheet-like molded product of the present embodiment is excellent in heat sealability, flexibility, low anisotropy, transparency, low stickiness and impact resistance, and can be used without any particular limitation. Taking advantage of this characteristic, the molded sheet can be suitably used for a wide range of applications. Suitable applications include packaging of various clothing; packaging of various foods; packaging of daily goods; industrial material packaging; laminates of various rubber products, resin products, leather products, etc .; elastic tape used for paper diapers, etc .; dicing film, etc.
- Protective films used to protect building materials and steel plates Adhesive film base materials; Sheet materials such as trays for fresh fish, fruit and vegetable packs and frozen food containers; Applications for household appliances such as TVs, stereos and vacuum cleaners; Automotive interior / exterior parts applications such as parts, body panels and side seals; road pavement materials; waterproof sheets; waterproof sheets; civil engineering packing; daily goods; leisure goods; toys; industrial goods; Stationery such as a file back cover; and medical equipment such as an infusion bag.
- the sheet-like molded body of the present embodiment is a medical molded body utilizing characteristics such as heat sealability, flexibility, low anisotropy, transparency, low stickiness and impact resistance balance,
- it can be particularly suitably used for medical films, medical infusion bags and medical tubes, and packaging materials such as food packaging materials and clothing packaging materials.
- Back refers to a bag-shaped molded body that can be molded from a sheet-shaped molded body.
- the bag include a food packaging bag, a clothing packaging bag, and a medical bag.
- the medical bag include a medical infusion bag and a chemical packaging bag.
- a hydrogenated block copolymer was prepared by the method described below to produce a polypropylene resin composition and a molded body thereof, and the physical properties were compared. At that time, the characteristics of the hydrogenated block copolymer and the physical properties of the polypropylene resin molding were measured as follows.
- styrene content Content of all vinyl aromatic compound units in the hydrogenated block copolymer (hereinafter also referred to as “styrene content”) Measurement was performed by proton nuclear magnetic resonance ( 1 H-NMR) method using the block copolymer before hydrogenation.
- the measuring instrument is JNM-LA400 (manufactured by JEOL), deuterated chloroform is used as a solvent, sample concentration is 50 mg / mL, observation frequency is 400 MHz, tetramethylsilane is used as a chemical shift standard, pulse delay 2.904 seconds, scan The number of times was 64, the pulse width was 45 °, and the measurement temperature was 26 ° C.
- the styrene content was calculated using the integrated value of the total styrene aromatic signal in the spectrum at 6.2 to 7.5 ppm.
- Amount of vinyl bond in hydrogenated block copolymer Using a block copolymer before hydrogenation, it was measured by proton nuclear magnetic resonance ( 1 H-NMR) method. Measurement conditions and measurement data processing methods were the same as in 1).
- the vinyl bond amount is calculated by calculating the integral value per 1H of each bond mode from the integral values of signals attributed to 1,4-bond and 1,2-bond, and then 1,4-bond and 1,2-bond. (In the case of butadiene and in the case of isoprene, it becomes a 3,4-bond).
- Hydrogenation rate of hydrogenated block copolymer was measured by proton nuclear magnetic resonance ( 1 H-NMR) using a hydrogenated block copolymer.
- the measurement conditions and measurement data processing method are the same as in 1).
- For the hydrogenation rate an integrated value of a signal derived from a residual double bond of 4.5 to 5.5 ppm and a signal derived from a hydrogenated conjugated diene was calculated, and the ratio was calculated.
- MFR Melt flow rate
- the seal part of the test piece was peeled 180 ° at a speed of 200 mm / min with a tensile tester (Minebea, TGE-500N), and the heat seal strength (N / 15 mm) per 15 mm width was measured. It was used as an index of sealability. From the obtained heat seal strength, the following criteria were used for evaluation.
- Heat seal strength is 25 N / 15 mm or more 4: Heat seal strength is 20 N / 15 mm or more and less than 25 N / 15 mm 3: Heat seal strength is 10 N / 15 mm or more and less than 20 N / 15 mm 2: Heat seal strength is 5 N / 15 mm or more and 10 N / Less than 15mm 1: Heat seal strength is less than 5N / 15mm
- Tensile modulus is less than 400 MPa 4: Tensile modulus is 400 MPa or more and less than 500 MPa 3: Tensile modulus is 500 MPa or more and less than 600 MPa 2: Tensile modulus is 600 MPa or more and less than 800 MPa 1: Tensile modulus is 800 MPa or more
- MD / TD value is in the range of 0.95 to 1.05 4: MD / TD value is in the range of 0.92 to 1.08 (except for the above range 5) 3: MD / TD value is in the range of 0.89 to 1.11 (except for the above 4 and 5 ranges) 2: MD / TD value is in the range of 0.85 to 1.15 (excluding the above range of 3 to 5) 1: MD / TD value is less than 0.85 or more than 1.15
- Tack strength is less than 3N 4: Tack strength is 3N or more and less than 5N 3: Tack strength is 5N or more and less than 10N 2: Tack strength is 10N or more and less than 15N 1: Tack strength is 15N or more
- Non-breakage rate is 80% or more and less than 100% 3: Non-breakage rate is 60% or more and less than 80% 2: Non-breakage rate is 40% or more and less than 60% 1: Non-breakage rate is less than 40%
- the hydrogenation catalyst used for the hydrogenation reaction of the hydrogenated block copolymer (a) was prepared by the following method. Put 1 L of dried and purified cyclohexane into a nitrogen-substituted reaction vessel, add 100 mmol of bis ( ⁇ 5-cyclopentadienyl) titanium dichloride, and add n-hexane solution containing 200 mmol of trimethylaluminum with sufficient stirring. The reaction was allowed to proceed at room temperature for about 3 days.
- the above hydrogenation catalyst is added so that the concentration in terms of titanium is 100 ppm per 100 parts by mass of the block copolymer, and a hydrogenation reaction is performed at a hydrogen pressure of 0.7 MPa and a temperature of 70 ° C. It was. Methanol is then added, and then octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate as a stabilizer is added in an amount of 0.3 parts by weight to the hydrogenated block copolymer. did.
- Table 2 shows the analysis results of the resulting hydrogenated block copolymers (a-1) to (a-48).
- Hydrogenated block copolymers (a-28) to (a-30) and (a-46) to (a-48) are obtained by blending polymer solutions obtained in separate reactors at a predetermined ratio.
- the hydrogenated block copolymer represented by the formula (1) was adjusted to contain a desired amount.
- the molded body of the present embodiment has an excellent balance of heat sealability, flexibility, low anisotropy, transparency, low stickiness, and impact resistance, and can be used without any particular limitation. Among them, it can be suitably used in the food packaging field, the clothing packaging field, and the medical field such as an infusion bag and an infusion tube.
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Abstract
Description
また、特許文献2及び3には、スチレンブロックと、ブタジエンブロックを含有し、水素添加されたブロック共重合体が開示されている。
特許文献1~3に開示されるブロック共重合体を用いたポリプロピレン成型体、例えばシート状、フィルム状及びバック状等の成型体にしたときのヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性のバランスに改善の余地があることが分かった。
〔1〕
分子中に、ビニル芳香族化合物単位を主体とする重合体ブロック(S)と、共役ジエン化合物単位を主体とする重合体ブロック(B)とを有する水素化ブロック共重合体であって、
前記水素化ブロック共重合体中、前記重合体ブロック(S)の含有量が5~20質量%であり、前記重合体ブロック(B)の含有量が80~95質量%であり、
前記重合体ブロック(B)は、重合体ブロック(B1)及び重合体ブロック(B2)を含み、前記重合体ブロック(B1)の水素化前のビニル結合量が30~60モル%であり、前記重合体ブロック(B2)の水素化前のビニル結合量が60超~100モル%であり、
前記水素化ブロック共重合体中、前記重合体ブロック(B1)の含有量は5~60質量%であり、前記重合体ブロック(B2)の含有量は30~85質量%であり、
前記水素化ブロック共重合体中、下記式(1)で表される構造の含有量が40~100質量%であり、
(S-B) ・・・式(1)
(式(1)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味する。)
前記水素化ブロック共重合体の水素化率が70モル%以上である、水素化ブロック共重合体。
〔2〕
式(1)で表される構造の含有量が40~90質量%であり、
下記式(2)~(4)で表される構造のいずれか一つをさらに含有する、〔1〕に記載の水素化ブロック共重合体。
(S-B)n-X ・・・式(2)
(S-B-S) ・・・式(3)
(S-B-S-B3) ・・・式(4)
(式(2)~(4)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味し、式(1)~(4)におけるSとBは、それぞれ同じでも異なっていてもよい。式(2)中、nは2以上の整数であり、Xはカップリング残基を表す。式(4)中、B3は重合体ブロック(B)とは異なる共役ジエン化合物単位を主体とする重合体ブロック(B3)を意味し、前記重合体ブロック(B3)の水素化前のビニル結合量が30~100モル%であり、前記水素化ブロック共重合体中、前記重合体ブロック(B3)の含有量は0.1~10質量%である。)
〔3〕
前記式(1)で表される構造において、前記重合体ブロック(S)と、前記重合体ブロック(B1)と、前記重合体ブロック(B2)とをこの順に有する、〔1〕又は〔2〕に記載の水素化ブロック共重合体。
〔4〕
前記重合体ブロック(B1)の水素化前のビニル結合量が40~60モル%である、〔1〕~〔3〕のいずれかに記載の水素化ブロック共重合体。
〔5〕
前記式(1)で表される構造の含有量が50~85質量%である、〔1〕~〔4〕のいずれかに記載の水素化ブロック共重合体。
〔6〕
〔1〕~〔5〕のいずれかに記載の水素化ブロック共重合体10~90質量%と、ポリプロピレン系樹脂10~90質量%と、を含む、ポリプロピレン系樹脂組成物。
〔7〕
前記ポリプロピレン系樹脂がランダムポリプロピレンである、〔6〕に記載のポリプ
ロピレン系樹脂組成物。
〔8〕
〔6〕又は〔7〕に記載のポリプロピレン系樹脂組成物を含む、成型体。
〔9〕
〔6〕又は〔7〕に記載のポリプロピレン系樹脂組成物を含む、シート。
本実施形態の水素化ブロック共重合体は、分子中に、ビニル芳香族化合物単位を主体とする重合体ブロック(S)と、共役ジエン化合物単位を主体とする重合体ブロック(B)とを有する水素化ブロック共重合体であって、
前記水素化ブロック共重合体中、前記重合体ブロック(S)の含有量が5~20質量%であり、前記重合体ブロック(B)の含有量が80~95質量%であり、
前記重合体ブロック(B)は、重合体ブロック(B1)及び重合体ブロック(B2)を含み、前記重合体ブロック(B1)の水素化前のビニル結合量が30~60モル%であり、前記重合体ブロック(B2)の水素化前のビニル結合量が60超~100モル%であり、
前記水素化ブロック共重合体中、前記重合体ブロック(B1)の含有量は5~60質量%であり、前記重合体ブロック(B2)の含有量は30~85質量%であり、
前記水素化ブロック共重合体中、下記式(1)で表される構造の含有量が40~100質量%であり、
(S-B) ・・・式(1)
(式(1)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味する。)
前記水素化ブロック共重合体の水素化率が70モル%以上である。
重合体ブロック(S)においては、ビニル芳香族化合物単位の含有量は91質量%以上であり、重合体ブロック(B)においては、共役ジエン化合物単位の含有量は91質量%以上である。
得られるポリプロピレン系樹脂組成物の成型体のヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、ビニル芳香族化合物単位を主体とする重合体ブロック(S)におけるビニル芳香族化合物単位の含有量は、好ましくは92質量%以上、より好ましくは93質量%以上、さらに好ましくは95質量%以上、よりさらに好ましくは100質量%である。
同様の観点から、共役ジエン化合物単位を主体とする重合体ブロック(B)における共役ジエン化合物の含有量は、好ましくは92質量%以上、より好ましくは93質量%以上、さらに好ましくは95質量%以上、よりさらに好ましくは100質量%である。また、共役ジエン化合物単位を主体とする重合体ブロック(B1)及び共役ジエン化合物単位を主体とする重合体ブロック(B2)における共役ジエン化合物単位の含有量は、それぞれ独立して、好ましくは91質量%以上、より好ましくは92質量%以上、さらに好ましくは93質量%以上、よりさらに好ましくは95質量%以上、そしてさらに好ましくは100質量%である。
ビニル芳香族化合物単位を主体とする重合体ブロック(S)においては、共役ジエン化合物単位が含まれていてよく、共役ジエン化合物単位を主体とする重合体ブロック(B)には、共役ジエン化合物単位を主体とする重合体ブロック(B1)及び共役ジエン化合物単位を主体とする重合体ブロック(B2)それぞれにおいて、ビニル芳香族化合物単位を含んでいてよい。
これらの中でも、入手性及び生産性の観点から、スチレン、α-メチルスチレン及び4-メチルスチレンが好ましく、スチレンがより好ましい。
重合体ブロック(S)は、1種のビニル芳香族化合物単位で構成されていてもよいし、2種以上のビニル芳香族化合物単位から構成されていてもよい。
重合体ブロック(B1)及び重合体ブロック(B2)における「水素化前のビニル結合量」とは、水素化前のブロック共重合体に組み込まれている共役ジエン化合物に起因する1,4-結合(シス及びトランス)と1,2-結合(但し、3,4-結合で重合体に組み込まれている場合には1,2-結合と3,4-結合の合計量をいう)の合計量に対する、1,2-結合量(モル%)をいう。
共役ジエン化合物としては、特に限定されないが、例えば、1,3-ブタジエン、2-メチル-1,3-ブタジエン(イソプレン)、2,3-ジメチル-1,3-ブタジエン、1,3-ペンタジエン、2-メチル-1,3-ペンタジエン、1,3-ヘキサジエン及びファルネセン等が挙げられる。
これらの中でも、一般的なジオレフィンとして、1,3-ブタジエン及びイソプレンが挙げられる。
重合体ブロック(B)、重合体ブロック(B1)及び重合体ブロック(B2)は、それぞれ、1種の共役ジエン化合物単位で構成されていてもよいし、2種以上の共役ジエン化合物単位から構成されていてもよい。
具体的には、重合体ブロック(B)の水素化前の平均ビニル結合量は、
重合体ブロック(B1)の水素化前のビニル結合量×(重合体ブロック(B1)の含有量/重合体ブロック(B1)及び(B2)の含有量の和)+重合体ブロック(B2)の水素化前のビニル結合量×(重合体ブロック(B2)の含有量/重合体ブロック(B1)及び(B2)の含有量の和)
として求めることができる。
重合体ブロック(B)の水素化前の平均ビニル結合量は、生産性、並びに得られるポリプロピレン系樹脂組成物成型体の柔軟性、透明性、低べたつき性及び耐衝撃性等の観点から、より好ましくは45~95モル%、さらに好ましくは48~91モル%、よりさらに好ましくは54~85モル%である。
本実施形態において、重合体ブロック(B2)の含有量は、水素化ブロック共重合体中、30~85質量%である。重合体ブロック(B2)の含有量は、得られるポリプロピレン系樹脂組成物成型体のヒートシール性、柔軟性、異方性、透明性及び耐衝撃性の観点から、水素化ブロック共重合体中、好ましくは35~75質量%、より好ましくは40~70質量%である。
(S-B) ・・・式(1)
得られるポリプロピレン系樹脂組成物の成型体のヒートシール性、柔軟性、低異方性、
透明性、低べたつき性及び耐衝撃性等の観点から、水素化ブロック共重合体中、式(1)で表される構造の含有量は、好ましくは43~95質量%、より好ましくは46~90質量%、さらに好ましくは50~85質量%である。
カップリング率(質量%)=[(ピーク総面積)-(式(1)で表される構造由来のピーク面積)]/(ピーク総面積)×100
カップリング剤の種類、量は、水素化ブロック共重合体の所望とする重量平均分子量に応じて適宜調整することができる。
例えば、水素化ブロック共重合体のカップリング率が0~60質量%である場合、水素化ブロック共重合体中、式(1)で表される構造の含有量は、40~100質量%である。
(S-B)n-X ・・・式(2)
(S-B-S) ・・・式(3)
(S-B-S-B3) ・・・式(4)
(式(2)~(4)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味し、式(1)~(4)におけるSとBは、それぞれ同じでも異なっていてもよい。式(2)中、nは2以上の整数であり、Xはカップリング残基を表す。式(4)中、B3は重合体ブロック(B)とは異なる共役ジエン化合物単位を主体とする重合体ブロック(B3)を意味し、前記重合体ブロック(B3)の水素化前のビニル結合量が30~100モル%であり、前記水素化ブロック共重合体中、前記重合体ブロック(B3)の含有量は0.1~10質量%である。)
本実施形態において、上記式(2)~(4)で表される構造のいずれか一つを含有する場合、得られるポリプロピレン系樹脂組成物の成型体のヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、水素化ブロック共重合体中、式(1)で表される構造の含有量は、好ましくは40~90質量%、より好ましくは43~95質量%、さらに好ましくは46~90質量%、よりさらに好ましくは50~85質量%である。
得られるポリプロピレン系樹脂組成物の成型体のヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、式(2)中、nは、好ましくは2~4、より好ましくは2又は3、さらに好ましくは2である。
本実施形態における「水素化ブロック共重合体の水素化率」とは、水素化ブロック共重合体中に含まれる全共役ジエン化合物単位の水素化率(モル%)をいう。
水素化ブロック共重合体の水素化率を70モル%以上とすることで、重合体ブロック(B)とポリプロピレン系樹脂との溶解パラメータ値が近づき、水素化ブロック共重合体のポリプロピレン系樹脂組成物における分散性が良好になることから、得られるポリプロピレン系樹脂組成物の成型体の柔軟性及び透明性が良好となる。
生産性、並びに得られるポリプロピレン系樹脂組成物の成型体の柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、水素化ブロック共重合体の水素化率は、好ましくは85モル%以上、より好ましくは90モル%以上、さらに好ましくは95モル%以上である。
水素化ブロック共重合体の分子量分布も、重量平均分子量(Mw)と同様に、GPCによる測定から求めることができ、分子量分布は重量平均分子量(Mw)と数平均分子量(Mn)の比率である。
本実施形態の水素化ブロック共重合体は、有機溶媒中で、有機アルカリ金属化合物を重合開始剤として重合を行い、所望によりカップリング反応を行って、その後水素化反応を行うことにより製造することができる。
重合の態様としては、バッチ重合であっても連続重合であっても、あるいはそれらの組み合わせであってもよい。
分子量分布が狭く、高い強度を有する水素化ブロック共重合体を得る観点からは、バッチ重合方法が好ましい。
重合時間は目的とする重合体によって異なるが、一般に24時間以内であり、好ましくは0.1~10時間である。分子量分布が狭く、高い強度を有する水素化ブロック共重合体を得る観点からは、0.5~3時間であることがより好ましい。
重合系の雰囲気は、窒素及び溶媒を液相に維持するのに十分な圧力の範囲であればよく、特に限定されない。重合系内に、重合開始剤及びリビングポリマーを不活性化させるような不純物、例えば水、酸素、炭酸ガス等が存在しないことが好ましい。
(但し、有機アルカリ金属化合物は、アルカリ金属アルコキシドやアルカリ金属化合物に相当する化合物は含まない。)
有機リチウム化合物としては、例えば、有機モノリチウム化合物、有機ジリチウム化合物及び有機ポリリチウム化合物等が挙げられる。
有機リチウム化合物としては、特に限定されないが、例えば、エチルリチウム、n-プロピルリチウム、イソプロピルリチウム、n-ブチルリチウム、sec-ブチルリチウム、t-ブチルリチウム、フェニルリチウム、ヘキサメチレンジリチウム、ブタジエニルリチウム及びイソプロペニルジリチウム等が挙げられる。
これらの中でも、重合活性の点でn-ブチルリチウム及びsec-ブチルリチウムが好ましい。
ビニル化剤及び後述するアルカリ金属アルコキシドを2以上の条件に分けて添加することにより、重合体ブロック(B)中に、水素化前のビニル結合量の異なる重合体ブロックを製造することができる。
ビニル化剤は、単独で用いてもよく、二種以上を併用してもよい。
直鎖状エーテル化合物としては、特に限定されないが、例えば、ジメチルエーテル、ジエチルエーテル、ジフェニルエーテル、エチレングリコールジメチルエーテル、エチレングリコールジエチルエーテル、エチレングリコールジブチルエーテル等のエチレングリコールのジアルキルエーテル化合物類;ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル及びジエチレングリコールジブチルエーテル等のジエチレングリコールのジアルキルエーテル化合物類等が挙げられる。
環状エーテル化合物としては、特に限定されないが、例えば、テトラヒドロフラン、ジオキサン、2,5-ジメチルオキソラン、2,2,5,5-テトラメチルオキソラン、2,2-ビス(2-オキソラニル)プロパン及びフルフリルアルコール等が挙げられる。
第3級アミン系化合物としては、特に限定されないが、例えば、ピリジン、N,N,N´,N´-テトラメチルエチレンジアミン、トリブチルアミン、テトラメチルプロパンジアミン、1,2-ジピペリジノエタン及びビス[2-(N,N-ジメチルアミノ)エチル]エーテル等が挙げられる。
エーテル化合物は、単独で用いてもよく、二種以上を併用してもよい。
第3級アミン化合物としては、アミンを2個有する化合物が好ましい。これらの中でも、分子内で対称性を示す構造を有するものが好ましく、当該構造を有する第3級アミン化合物として、N,N,N´,N´-テトラメチルエチレンジアミン、ビス[2-(N,N-ジメチルアミノ)エチル]エーテル及び1,2-ジピペリジノエタンが好適である。
第3級アミン化合物は、単独で用いてもよく、二種以上を併用してもよい。
アルカリ金属アルコキシドとは、一般式MOR(式中、Mはアルカリ金属、Rはアルキル基である)で表される化合物である。
アルカリ金属アルコキシドとしては、特に限定されないが、例えば、炭素数2~12のアルキル基を有するナトリウムアルコキシド、リチウムアルコキシド及びカリウムアルコキシドが挙げられ、好ましくは、炭素数3~6のアルキル基を有するナトリウムアルコキシドやカリウムアルコキシド、より好ましくは、ナトリウム-t-ブトキシド、ナトリウム-t-ペントキシド、カリウム-t-ブトキシド及びカリウム-t-ペントキシドである。
これらの中でも、ナトリウムアルコキシドであるナトリウム-t-ブトキシド及びナトリウム-t-ペントキシドが好適である。
アルカリ金属アルコキシド/有機リチウム化合物のモル比は、高いビニル結合量、高い重合速度及び高いブロック率の観点から0.01以上とし、狭い分子量分布及び高い水素化活性を得る観点から0.3以下とすることが好ましい。
ビニル化剤/有機リチウム化合物のモル比とアルカリ金属アルコキシド/有機リチウム化合物のモル比を上記範囲内とすることにより、重合速度の向上が図られ、目的とする水素化ブロック共重合体における水素化前のビニル結合量を高くできるとともに分子量分布を狭くでき、さらにはブロック率が向上する傾向にある。その結果、ポリプロピレン系樹脂組成物の成型体の低異方性、柔軟性、透明性、平滑性及び低べたつき性等がより良好となる傾向にある。
アルカリ金属アルコキシド/有機リチウム化合物のモル比は、高いビニル結合量、高い重合速度及び高いブロック率の観点から0.02以上が好ましく、狭い分子量分布及び高い水素化活性の観点から0.2以下が好ましく、より好ましくは0.03~0.1、さらに好ましくは0.03~0.08である。
アルカリ金属アルコキシド/ビニル化剤のモル比は、より好ましくは0.012~0.080、さらに好ましくは0.015~0.060、よりさらに好ましくは0.015~0.050である。
失活剤としては、アルキル金属化合物が挙げられ、一つのアルキル置換基あたり1~20個の炭素原子をもつアルキルアルミニウム、亜鉛及びマグネシウム等が挙げられる。
アルキル金属化合物は、単独で用いてもよく、二種以上を併用してもよい。
カップリング反応の条件は、目的とする重合体によって異なるが、反応温度は、一般に0℃~150℃であり、反応時間は、一般に24時間以内である。
2官能カップリング剤としては、例えば、トリメトキシシラン、トリエトキシシラン、テトラメトキシシラン、テトラエトキシシラン、ジメチルジメトキシシラン、ジエチルジメトキキシラン、ジクロロジメトキシシラン、ジクロロジエトキシシラン、トリクロロメトキシシラン及びトリクロロエトキシシラン等のアルコキシシラン化合物;ジクロロエタン、ジブロモエタン、ジメチルジクロロシラン及びジメチルジブロモシラン等のジハロゲン化合物;安息香酸メチル、安息香酸エチル、安息香酸フェニル及びフタル酸エステル類等の酸エステル類等が挙げられる。
3官能以上の多官能カップリング剤としては、例えば、トリメトキシシランハイドライド、メチルトリメトキシシラン、オクチルトリメトキシシラン、イソブチルトリメトキシシラン、テトラキス2-ブトキシエチルオルトシリケート、テトラブトキシオルトシリケート及び3価以上のポリアルコール類;エポキシ化大豆油、ジグリシジルビスフェノールA及び1,3-ビス(N,N-ジグリシジルアミノメチル)シクロヘキサン等の多価エポキシ化合物;一般式R4-nSiXn(ここで、Rは炭素数1~20の炭化水素基、Xはハロゲン、nは3~4の整数を示す)で表されるハロゲン化ケイ素化合物、例えば、メチルシリルトリクロリド、t-ブチルシリルトリクロリド及び四塩化ケイ素並びにこれら化合物の塩素が臭素で置換されている臭化ケイ素化合物;一般式R4-nSnXn(ここで、Rは炭素数1~20の炭化水素基、Xはハロゲン、nは3~4の整数を示す)で表されるハロゲン化スズ化合物、例えば、メチルスズトリクロリド、t-ブチルスズトリクロリド及び四塩化スズ等が挙げられる。また、カップリング剤としては、炭酸ジメチル及び炭酸ジエチル等であってもよい。
水素化率は、例えば、水素化触媒の触媒量によって制御することができる。水素化速度は、例えば、水素化触媒の触媒量、水素フィード量、圧力及び/又は温度等によって制御することができる。
チタノセン化合物としては、例えば、特開平8-109219号公報に記載された化合物等が挙げられ、特に限定されないが、例えば、ビスシクロペンタジエニルチタンジクロライド、モノペンタメチルシクロペンタンジエニルチタントリクロライド等のジクロペンタジエニル骨格、インデニル骨格又はフルオレニル骨格を有する配位子を少なくとも1つ以上持つ化合物が挙げられる。ジクロペンタジエニル骨格、インデニル骨格又はフルオレニル骨格については、置換されていてもよく、未置換であってもよい。
還元性有機金属化合物としては、特に限定されないが、例えば、有機リチウム等の有機アルカリ金属化合物、有機マグネシウム化合物、有機アルミニウム化合物、有機ホウ素化合物及び有機亜鉛化合物等が挙げられる。
水素化反応における水素の圧力は、一般に0.1~15MPaの範囲内であり、好ましくは0.2~10MPaの範囲内、より好ましくは0.3~5MPaの範囲内である。
水素化反応における反応時間は、一般に3分~10時間であり、好ましくは10分~5時間である。
ペレット化の方法としては、例えば、一軸又は二軸押出機から水素化ブロック共重合体をストランド状に押出して、ダイ部前面に設置された回転刃により、水中で切断する方法;一軸又は二軸押出機から水素化ブロック共重合体をストランド状に押出して、水冷又は空冷した後、ストランドカッターにより切断する方法;オープンロール又はバンバリーミキサーにより溶融混合した後、ロールによりシート状に成型し、更に該シートを短冊状にカットした後に、ペレタイザーにより立方状ペレットに切断する方法等が挙げられる。
水素化ブロック共重合体のペレット成型体の大きさ及び形状は特に限定されない。
ペレットブロッキング防止剤としては、特に限定されないが、例えば、ステアリン酸カルシウム、ステアリン酸マグネシウム、ステアリン酸亜鉛、ポリエチレン、ポリプロピレン、エチレンビスステアリルアミド、タルク及びアモルファスシリカ等が挙げられる。
得られるポリプロピレン系樹脂組成物及びポリプロピレン系樹脂組成物の成型体の透明性の観点から、ステアリン酸カルシウム、ポリエチレン及びポリプロピレンが好ましい。
ペレットブロッキング防止剤の配合量としては、水素化ブロック共重合体に対して、好ましくは500~6000ppm、より好ましくは1000~5000ppmである。
ペレットブロッキング防止剤は、ペレット表面に付着した状態で配合されていることが好ましいが、ペレット内部にある程度含むこともできる。
本実施形態のポリプロピレン系樹脂組成物は、本実施形態の水素化ブロック共重合体(a)とポリプロピレン系樹脂(b)の総量100質量%とした場合に、本実施形態の水素化ブロック共重合体(a)10~90質量%と、ポリプロピレン系樹脂(b)10~90質量%とを含む。
得られるポリプロピレン系樹脂組成物を含む成型体の低異方性及び低べたつき性の観点から、ポリプロピレン系樹脂組成物中の水素化ブロック共重合体(a)の含有量は90質量%以下であり、得られるポリプロピレン系樹脂組成物を含む成型体のヒートシール性、柔軟性、透明性及び耐衝撃性等の観点から、ポリプロピレン系樹脂組成物中の水素化ブロック共重合体(a)の含有量は10質量%以上である。
ポリプロピレン系樹皮組成物の成型体のヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、水素化ブロック共重合体(a)の含有量は、好ましくは5~60質量%、より好ましくは10~50質量%、さらに好ましくは20~40質量%であり、ポリプロピレン系樹脂(b)の含有量は、好ましくは40~95質量%、より好ましくは50~90質量%、さらに好ましくは60~80質量%である。
これらの中でも、ランダムポリプロピレンが好ましい。
ポリプロピレン系樹脂は、単独で用いてもよく、二種以上を併用してもよい。
ランダムポリプロピレンとしては、プロピレン単位の含有量が98質量%未満であれば特に限定されないが、例えば、プロピレンとエチレンのランダム共重合体及びプロピレンと炭素数4~20のα-オレフィンのランダム共重合体等が挙げられる。
ランダムポリプロピレンとして、プロピレンとエチレンのランダム共重合体又はプロピレンと炭素数4~20のα-オレフィンのランダム共重合体を用いる場合、ポリプロピレン系樹皮組成物の成型体の柔軟性、透明性及び耐衝撃性がより良好となる傾向にある。
ランダムポリプロピレンの中でも、ポリプロピレン系樹脂組成物の成型体のヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性等の観点から、ランダムポリプロピレンがプロピレンとエチレンのランダム共重合体又はプロピレンと炭素数4~12のα-オレフィンのランダム共重合体が好ましく、プロピレン-エチレンランダム共重合体、プロピレン-1-ブテンランダム共重合体及びプロピレン-エチレン-1-ブテン三元ランダム共重合体がより好ましい。
α-オレフィンは、単独で用いてもよく、二種以上を併用してもよい。また、エチレンと炭素数4~20のα-オレフィンを併用して用いてもよい。
エチレン単位又はα-オレフィン単位の含有量は、より好ましくは2質量%超30質量%以下、さらに好ましくは2.5~25質量%、よりさらに好ましくは3~20質量%である。
プロピレン単位の含有量は、より好ましくは70質量%以上98質量%未満、さらに好ましくは75~97.5質量%、よりさらに好ましくは80~97質量%である。
添加剤としては、特に限定されないが、例えば、難燃剤、安定剤、着色剤、顔料、酸化防止剤、帯電防止剤、分散剤、流れ増強剤、ステアリン酸金属塩といった離型剤、シリコーンオイル、鉱物油系軟化剤、合成樹脂系軟化剤、銅害防止剤、架橋剤及び核剤等が挙げられる。
本実施形態のポリプロピレン系樹脂組成物は、例えば、水素化ブロック共重合体(a)、ポリプロピレン系樹脂(b)及び必要に応じて加えられる他の成分を、その各成分の組成比に応じてドライブレンドする方法、通常の高分子物質の混合に供される装置によって調整する方法等によって製造することができる。
混練時の溶融温度は、適宜設定することができるが、一般に130~300℃の範囲内、好ましくは150~250℃の範囲内である。
本実施形態の成型体は、本実施形態のポリプロピレン系樹脂組成物を含む。
成型体としては、例えば、シート、フィルム、バック、チューブ、医療用成型体及び包装材等が挙げられる。
医療用成型体としては、例えば、医療用フィルム、医療用バック、医療用輸液チューブ等が挙げられ、包装材としては、例えば、食品包装材及び衣料包装材等が挙げられる。
本実施形態において「シート状成型体」及び「シート」は、上記フィルム及びシートを包含する用語として用いる。
本実施形態のシートの厚みは、特に限定されないが、ポリプロピレン系樹脂組成物の成型体の成型加工性、柔軟性及び低異方性等の観点から、好ましくは0.005mm~0.5mm、より好ましくは0.01mm~0.3mmである。
シート状成型体の製造方法としては、例えば、押出し成型法としてTダイ法及びインフレーション法等を採用することができ、インフレーション法として通常の空冷インフレーション成型法、空冷2段インフレーション成型法、高速インフレーション成型法及び水冷インフレーション成型法等を採用できる。ダイレクトブロー及びインジェクションブロー等のブロー成型法並びにプレス成型法を採用することもできる。
これらの中でも、バブル安定性及びドローダウンの抑制に優れるため、Tダイ法及びインフレーション法が好ましい。
かかる他のポリマーとしては、例えば、ポリプロピレン、ポリエチレン、エチレン・プロピレン共重合ゴム(EPM)及びエチレン・プロピレン・非共役ジエン共重合ゴム(EPDM)等のオレフィン系重合体;ポリエステルエラストマー、ポリエチレンテレフタレート及びポリブチレンテレフタレート等のポリエステル系重合体;ポリアミド6、ポリアミド6・6、ポリアミド6・10、ポリアミド11、ポリアミド12及びポリアミド6・12等のポリアミド系樹脂;ポリアクリル酸メチル及びポリメタクリル酸メチル等のアクリル系樹脂;ポリオキシメチレンホモポリマー及びポリオキシメチレンコポリマー等のポリオキシメチレン系樹脂;スチレン単独重合体、アクリロニトリル・スチレン樹脂及びアクリロニトリル・ブタジエン・スチレン樹脂等のスチレン系樹脂;ポリカーボネート樹脂;スチレン・ブタジエン共重合体ゴム及びスチレン・イソプレン共重合体ゴム等のスチレン系エラストマー並びにその水素添加物又はその変性物;天然ゴム;合成イソプレンゴム及び液状ポリイソプレンゴム並びにその水素添加物又は変性物;クロロプレンゴム;アクリルゴム;ブチルゴム;アクリロニトリル・ブタジエンゴム;エピクロロヒドリンゴム;シリコーンゴム;フッ素ゴム;クロロスルホン化ポリエチレン;ウレタンゴム;ポリウレタン系エラストマー;ポリアミド系エラストマー;ポリエステル系エラストマー;軟質塩化ビニル樹脂等が挙げられる。
これらの他のポリマーの1種又は2種以上のブレンドを、単層又は層毎に種類が異なっている多層で積層して用いてもよい。
また成型された多層積層体は、未延伸のままであってもよく、あるいは一軸又は二軸延伸してもよい。
好適な用途としては、各種衣料類の包装;各種食品の包装;日用雑貨包装;工業資材包装;各種ゴム製品、樹脂製品及び皮革製品等のラミネート;紙おむつ等に用いられる伸縮テープ;ダイシングフィルム等の工業用品;建材や鋼板の保護に用いられるプロテクトフィルム;粘着フィルムの基材;食肉鮮魚用トレー、青果物パック及び冷凍食品容器等のシート用品;テレビ、ステレオ及び掃除機等の家電用品用途;バンパー部品、ボディーパネル及びサイドシール等の自動車内外装部品用途;道路舗装材;防水シート;遮水シート;土木パッキン;日用品;レジャー用品;玩具;工業用品;ファニチャー用品;筆記用具、透明ポケット、ホルダー及びファイル背表紙等の文具;並びに輸液バック等の医療用具等が挙げられる。
これらの中でも、本実施形態のシート状成型体は、ヒートシール性、柔軟性、低異方性、透明性、低べたつき性及び耐衝撃性のバランス等の特性を活かして、医療用成型体、例えば医療用フィルム、医療用輸液バック及び医療用チューブ、並びに包装材、例えば食品包装材及び衣料包装材等に特に好適に用いることができる。
1)水素化ブロック共重合体中の全ビニル芳香族化合物単位の含有量(以下、「スチレン含有量」ともいう。)
水素化前のブロック共重合体を用いて、プロトン核磁気共鳴(1H-NMR)法により測定した。測定機器はJNM-LA400(JEOL製)、溶媒に重水素化クロロホルムを用い、サンプル濃度は50mg/mL、観測周波数は400MHz、化学シフト基準にテトラメチルシランを用い、パルスディレイ2.904秒、スキャン回数64回、パルス幅45°及び測定温度26℃で行った。
スチレン含有量は、スペクトルの6.2~7.5ppmにおける総スチレン芳香族シグナルの積算値を用いて算出した。
水素化前のブロック共重合体を用いて、プロトン核磁気共鳴(1H-NMR)法により測定した。測定条件及び測定データの処理方法は1)と同様にして行った。
ビニル結合量は、1,4-結合及び1,2-結合に帰属されるシグナルの積分値から各結合様式の1Hあたりの積分値を算出した後、1,4-結合と1,2-結合(ブタジエンの場合であって、イソプレンの場合ならば3,4-結合になる)との比率から算出した。
水素化ブロック共重合体を用いて、プロトン核磁気共鳴(1H-NMR)により測定した。測定条件及び測定データの処理方法は1)と同様である。水素化率は、4.5~5.5ppmの残存二重結合に由来するシグナル及び水素添加された共役ジエンに由来するシグナルの積分値を算出し、その比率を算出した。
水素化ブロック共重合体中の式(1)で表される構造の含有量は、GPC測定(島津製作所製、LC-10)、カラム:TSKgelGMHXL(4.6mmID×30cm、2本)、溶媒:テトラヒドロフラン(THF)を測定し、全ピーク面積に対する式(1)に相当する面積との比率を算出することで求めた。
水素化ブロック共重合体及びポリプロピレン系樹脂のMFRは、ISO 1133に準拠して、230℃、2.16Kg荷重で測定した。
実施例及び比較例で得られた厚み約250μmのシート状成型体を2枚重ね合わせた後、ヒートシーラー(テスター産業製、TP-701-B:シール温度160℃、シール時間5秒、実圧0.2MPa)で片面を加熱し、ヒートシールを行なった。得られたサンプルを23℃で24時間以上静置した後、シール幅方向に対して直角方向に幅15mmを切り出し、長さ10mm×幅15mmのシール部を有する試験片を得た。次に、試験片のシール部を引張試験機(ミネベア、TGE-500N)により、200mm/分の速度で180°剥離して、幅15mmあたりのヒートシール強度(N/15mm)を測定し、ヒートシール性の指標とした。得られたヒートシール強度から、次の基準で評価した。
5:ヒートシール強度が25N/15mm以上
4:ヒートシール強度が20N/15mm以上25N/15mm未満
3:ヒートシール強度が10N/15mm以上20N/15mm未満
2:ヒートシール強度が5N/15mm以上10N/15mm未満
1:ヒートシール強度が5N/15mm未満
実施例及び比較例で得られた厚み約250μmのシート状成型体を用いて、JIS K6251に準拠し、JIS 5号試験片に打ち抜き、引張速度200mm/minで引張弾性率(MPa)を測定し、柔軟性の指標とした。得られた引張弾性率から、次の基準で評価した。
5:引張弾性率が400MPa未満
4:引張弾性率が400MPa以上500MPa未満
3:引張弾性率が500MPa以上600MPa未満
2:引張弾性率が600MPa以上800MPa未満
1:引張弾性率が800MPa以上
実施例及び比較例で得られた250μmの厚みのシート状成型体を用いて、引取り方向(MD)とそれに垂直な方向(TD)について、JIS 5号ダンベルに打抜いたサンプルを用い、JIS K6251に準拠して、引張試験機(ミネベア、Tg-5kN)により引張速度200mm/minで引張弾性率(MPa)を測定した。得られた引張弾性率の比(MD/TD)から、次の基準で異方性を評価した。
5:MD/TDの値が0.95~1.05の範囲
4:MD/TDの値が0.92~1.08の範囲(ただし上記5の範囲以外)
3:MD/TDの値が0.89~1.11の範囲(ただし上記4と5の範囲以外)
2:MD/TDの値が0.85~1.15の範囲(ただし上記3~5の範囲以外)
1:MD/TDの値が0.85未満または、1.15を超える
実施例及び比較例で得られた厚み約250μmのシート状成型体を用いて、ヘイズメーター(日本電色工業製、NDH-1001DP)を用いてヘイズ値(%)を測定し、透明性の指標とした。得られたヘイズ値から、次の基準で評価した。
5:ヘイズ値が6%未満
4:ヘイズ値が6%以上10%未満
3:ヘイズ値が10%以上15%未満
2:ヘイズ値が15%以上20%未満
1:ヘイズ値が20%以上
実施例及び比較例で得られた厚み約250μmのシート状成型体を用いて、5cm×8cm及び4cm×6cmの試験
片に切り出した。得られた試験片を2枚重ね合わせた(上面:5cm×8cm、下面:4cm×5cm)後、その上面に500gの荷重(大きさ:6cm×10cm×1cm)を載せて、60秒間静止した後に、引張試験機(ミネベア、Tg-5kN)により100mm/分の速度で180°剥離させたときのタック強度(J)を測定し、低べたつき性の指標とした。得られたタック強度から、次の基準で評価した。
5:タック強度が3N未満
4:タック強度が3N以上5N未満
3:タック強度が5N以上10N未満
2:タック強度が10N以上15N未満
1:タック強度が15N以上
実施例及び比較例で得られた200μmの厚みのシート状成型体を、20cm×13cmの試験片に切り出し、試験片を2枚重ね合わせた後、3辺を145℃で2秒間ヒートシールし、袋を作成した。その袋に500mlの水を入れ、さらに残りの1辺を同様の条件でヒートシールして、水入りバックを作成した。さらに、上記水入りバックを4℃の冷蔵室に24時間放置した後、1.8mの高さから、各々10袋を落袋したときのバックの破袋率を測定し、耐衝撃性の指標とした。得られた破袋率から、次の基準で評価した。
5:非破袋率が100%
4:非破袋率が80%以上100%未満
3:非破袋率が60%以上80%未満
2:非破袋率が40%以上60%未満
1:非破袋率が40%未満
(水添触媒の調整)
水素化ブロック共重合体(a)の水添反応に用いた水添触媒を、下記の方法で調整した。窒素置換した反応容器に、乾燥及び精製したシクロヘキサン1Lを入れ、ビス(η5-シクロペンタジエニル)チタニウムジクロリド100ミリモルを添加し、十分に攪拌しながらトリメチルアルミニウム200ミリモルを含むn-ヘキサン溶液を添加して、室温にて約3日間反応させた。
内容積10Lの撹拌装置及びジャケット付き槽型反応器を使用して、バッチ重合を行った。反応器内に1Lのシクロヘキサンを入れ、表1に示す条件で、重合反応を行い、ブロック共重合体(a―1)~(a-48)を得た。
モノマーは、スチレン濃度20質量%のシクロヘキサン溶液、ブタジエン濃度20質量%のシクロヘキサン溶液を用いた。
得られたブロック共重合体に、上記水添触媒を、ブロック共重合体100質量部当たりにチタン換算濃度100ppmとなるように添加し、水素圧0.7MPa、温度70℃で水素添加反応を行った。その後メタノールを添加し、次に安定剤としてのオクタデシル-3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネートを、水素化ブロック共重合体に対して0.3質量部添加した。
得られた水素化ブロック共重合体(a-1)~(a-48)の解析結果を表2に示す。水素化ブロック共重合体(a-28)~(a-30)及び(a-46)~(a-48)は、別々の反応器で得られたポリマー溶液を所定の割合でブレンドすることで、式(1)で表される水素化ブロック共重合体を所望量含有するように調整した。
実施例及び比較例で用いたポリプロピレン系樹脂は次の通りであった。
PP(1):プロピレンーエチレンランダム共重合体[「PC630A」(商品名)、サンアロマー製、MFR=6.8/10分]
PP(2):プロピレンーエチレンランダム共重合体[「PM931M」(商品名)、サンアロマー製、MFR=25.1/10分]
PP(3):プロピレン単独共重合体[「PL500A」(商品名)、サンアロマー製、MFR=3.0/10分]
実施例1~30、比較例1~18の水素化ブロック共重合体とポリプロピレン系樹脂を表3に示す配合割合でドライブレンドし、二軸押出機(L/D=42、30mmΦ)で、200℃、350rpm、押出量5Kg/hで溶融混練して、ポリプロピレン系樹脂組成物のペレット(直径3mm、長さ3mm)を得た。これらのペレットを単軸押出機(40mmφ)、Tダイを用いて200~230℃、押出量5Kg/h、Tダイスリット厚み0.5mm、Tダイのスリット幅400mm、圧延ローラ表面温度35℃で押出成型することにより、それぞれ、厚さ250μmのシート状成型体を作成した。シート状成型体の厚さはスクリュー回転数、引き取り速度を変えることにより調整した。得られたシート状成型体の物性測定結果を表3に示す。
Claims (9)
- 分子中に、ビニル芳香族化合物単位を主体とする重合体ブロック(S)と、共役ジエン化合物単位を主体とする重合体ブロック(B)とを有する水素化ブロック共重合体であって、
前記水素化ブロック共重合体中、前記重合体ブロック(S)の含有量が5~20質量%であり、前記重合体ブロック(B)の含有量が80~95質量%であり、
前記重合体ブロック(B)は、重合体ブロック(B1)及び重合体ブロック(B2)を含み、前記重合体ブロック(B1)の水素化前のビニル結合量が30~60モル%であり、前記重合体ブロック(B2)の水素化前のビニル結合量が60超~100モル%であり、
前記水素化ブロック共重合体中、前記重合体ブロック(B1)の含有量は5~60質量%であり、前記重合体ブロック(B2)の含有量は30~85質量%であり、
前記水素化ブロック共重合体中、下記式(1)で表される構造の含有量が40~100質量%であり、
(S-B) ・・・式(1)
(式(1)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味する。)
前記水素化ブロック共重合体の水素化率が70モル%以上である、水素化ブロック共重合体。 - 式(1)で表される構造の含有量が40~90質量%であり、
下記式(2)~(4)で表される構造のいずれか一つをさらに含有する、請求項1に記載の水素化ブロック共重合体。
(S-B)n-X ・・・式(2)
(S-B-S) ・・・式(3)
(S-B-S-B3) ・・・式(4)
(式(2)~(4)中、Sは重合体ブロック(S)を意味し、Bは重合体ブロック(B)を意味し、式(1)~(4)におけるSとBは、それぞれ同じでも異なっていてもよい。式(2)中、nは2以上の整数であり、Xはカップリング残基を表す。式(4)中、B3は重合体ブロック(B)とは異なる共役ジエン化合物単位を主体とする重合体ブロック(B3)を意味し、前記重合体ブロック(B3)の水素化前のビニル結合量が30~100モル%であり、前記水素化ブロック共重合体中、前記重合体ブロック(B3)の含有量は0.1~10質量%である。) - 前記式(1)で表される構造において、前記重合体ブロック(S)と、前記重合体ブロック(B1)と、前記重合体ブロック(B2)とをこの順に有する、請求項1又は2に記載の水素化ブロック共重合体。
- 前記重合体ブロック(B1)の水素化前のビニル結合量が40~60モル%である、請求項1~3のいずれか一項に記載の水素化ブロック共重合体。
- 前記式(1)で表される構造の含有量が50~85質量%である、請求項1~4のいずれか一項に記載の水素化ブロック共重合体。
- 請求項1~5のいずれか一項に記載の水素化ブロック共重合体10~90質量%と、ポリプロピレン系樹脂10~90質量%と、を含む、ポリプロピレン系樹脂組成物。
- 前記ポリプロピレン系樹脂がランダムポリプロピレンである、請求項6に記載のポリプロピレン系樹脂組成物。
- 請求項6又は7に記載のポリプロピレン系樹脂組成物を含む、成型体。
- 請求項6又は7に記載のポリプロピレン系樹脂組成物を含む、シート。
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