JP2012008249A - Optical component composed of polypropylene resin composition - Google Patents
Optical component composed of polypropylene resin composition Download PDFInfo
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- JP2012008249A JP2012008249A JP2010142676A JP2010142676A JP2012008249A JP 2012008249 A JP2012008249 A JP 2012008249A JP 2010142676 A JP2010142676 A JP 2010142676A JP 2010142676 A JP2010142676 A JP 2010142676A JP 2012008249 A JP2012008249 A JP 2012008249A
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- propylene polymer
- propylene
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- 229920001155 polypropylene Polymers 0.000 title claims abstract description 135
- 230000003287 optical effect Effects 0.000 title claims abstract description 48
- 239000011342 resin composition Substances 0.000 title claims abstract description 31
- -1 polypropylene Polymers 0.000 title claims description 20
- 239000004743 Polypropylene Substances 0.000 title description 14
- 238000002844 melting Methods 0.000 claims abstract description 34
- 230000008018 melting Effects 0.000 claims abstract description 34
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 28
- 230000009477 glass transition Effects 0.000 claims abstract description 5
- 239000004711 α-olefin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 238000005191 phase separation Methods 0.000 claims description 9
- 238000000149 argon plasma sintering Methods 0.000 claims description 8
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 description 29
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 15
- 239000005977 Ethylene Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000000465 moulding Methods 0.000 description 9
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 7
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 4
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 4
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 4
- GQEZCXVZFLOKMC-UHFFFAOYSA-N 1-hexadecene Chemical compound CCCCCCCCCCCCCCC=C GQEZCXVZFLOKMC-UHFFFAOYSA-N 0.000 description 4
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 4
- HFDVRLIODXPAHB-UHFFFAOYSA-N 1-tetradecene Chemical compound CCCCCCCCCCCCC=C HFDVRLIODXPAHB-UHFFFAOYSA-N 0.000 description 4
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 4
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000001460 carbon-13 nuclear magnetic resonance spectrum Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 description 4
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 4
- 229920005604 random copolymer Polymers 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000007542 hardness measurement Methods 0.000 description 3
- 239000004611 light stabiliser Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000002667 nucleating agent Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229940069096 dodecene Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- WOOQSKAMMPIQIW-CIAFKFPVSA-N Bis(methylbenzylidene)sorbitol Chemical compound OC([C@H](O)[C@@H](O)[C@H](O)[C@H](O)C(O)=C(C)C=1C=CC=CC=1)=C(C)C1=CC=CC=C1 WOOQSKAMMPIQIW-CIAFKFPVSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- MWCLLHOVUTZFKS-UHFFFAOYSA-N Methyl cyanoacrylate Chemical compound COC(=O)C(=C)C#N MWCLLHOVUTZFKS-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- QAHYSATYLGMNPK-UHFFFAOYSA-L [Cl-].[Cl-].C(C)(C)(C)C1=C(C=2CC3=CC(=CC=C3C2C=C1)C(C)(C)C)[Zr+2] Chemical compound [Cl-].[Cl-].C(C)(C)(C)C1=C(C=2CC3=CC(=CC=C3C2C=C1)C(C)(C)C)[Zr+2] QAHYSATYLGMNPK-UHFFFAOYSA-L 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- CPOFMOWDMVWCLF-UHFFFAOYSA-N methyl(oxo)alumane Chemical compound C[Al]=O CPOFMOWDMVWCLF-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 230000017448 oviposition Effects 0.000 description 1
- XMGMFRIEKMMMSU-UHFFFAOYSA-N phenylmethylbenzene Chemical group C=1C=CC=CC=1[C]C1=CC=CC=C1 XMGMFRIEKMMMSU-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
本発明は、LEDランプなどの一次光源を散乱させるための部材として好適な光学部品に関する。 The present invention relates to an optical component suitable as a member for scattering a primary light source such as an LED lamp.
LEDランプなどの一次光源を保護するとともに、光を透過／散乱させて照明や電飾に活用するための成形体が知られている。
このような材料としては（メタ）アクリル系樹脂、ポリスチレン樹脂、ポリカーボネート系樹脂等が用いられているが、耐熱性や耐薬品性、耐候性などの点において十分とはいえない。
一方、これらの樹脂に対し、耐熱性や耐薬品性、耐候性などの点において相対的に優れるとともに、安価かつ成形が容易な材料としてポリプロピレン系樹脂が知られている。
このようなポリプロピレン材料樹脂を用い、耐候性を改善すると同時に光学特性（光線透過率、散乱光比率）を制御した光透過性成形品が開示されている（特許文献１，２）。しかしながらこれらの技術で得られる成形体は耐衝撃性が十分でなく、適用できる用途が限られる可能性があり、改良の余地があると考えられる。
また、ポリプロピレン樹脂耐衝撃性を改良する技術として、エチレン系共重合体（エチレン・アルファオレフィン共重合体やエチレン・酢酸ビニル共重合体など）やスチレン系エラストマー（水添スチレン・エチレン・ブチレン・スチレンブロック共重合体など）を配合する技術が知られている。
しかしながら、しかしながらこのようなエラストマーポリプロピレン樹脂に分散（相分離）するために透明性（とくに光線透過率）を低下させるため、光の透過性が低下し、光透過性が要求される成形品としては好ましくない。またこのようなエラストマーを配合することにより、製品の耐傷付き性も低下するため、光学部品としての性能低下につながるため、更なる改善が求められている。
A molded body for protecting a primary light source such as an LED lamp and transmitting / scattering light to be used for illumination and lighting is known.
As such a material, a (meth) acrylic resin, a polystyrene resin, a polycarbonate resin, or the like is used, but it is not sufficient in terms of heat resistance, chemical resistance, weather resistance, and the like.
On the other hand, polypropylene resins are known as materials that are relatively superior to these resins in terms of heat resistance, chemical resistance, weather resistance, and the like, and that are inexpensive and easy to mold.
A light-transmitting molded article using such a polypropylene material resin and improving the weather resistance and at the same time controlling optical characteristics (light transmittance, scattered light ratio) is disclosed (Patent Documents 1 and 2). However, the molded products obtained by these techniques are not sufficient in impact resistance, and there is a possibility that applicable applications may be limited, and there is room for improvement.
In addition, as a technology for improving the impact resistance of polypropylene resin, ethylene copolymers (ethylene / alpha olefin copolymers and ethylene / vinyl acetate copolymers) and styrene elastomers (hydrogenated styrene / ethylene / butylene / styrene) A technique for blending a block copolymer or the like) is known.
However, in order to disperse (phase separation) in such an elastomer polypropylene resin, the transparency (especially light transmittance) is lowered, so that the light transmittance is lowered, and the molded product is required to have light transmittance. It is not preferable. Further, blending such an elastomer also reduces the scratch resistance of the product, leading to a decrease in performance as an optical component, and therefore further improvement is required.
本発明は、上記課題を改善する光学部品の提供、より具体的には、光学特性（光線透過率、散乱光比率）と耐衝撃性と耐傷付き性を併せ持つ光学部品の提供を目的とする。
An object of the present invention is to provide an optical component that improves the above problems, and more specifically, to provide an optical component that has both optical properties (light transmittance, scattered light ratio), impact resistance, and scratch resistance.
本発明者らは、鋭意検討を行った結果、特定の特性を有するプロピレン重合体とポリプロピレン樹脂を組み合わせることで上記課題を解決できることを見出した。すなわち本発明の概要は以下のとおりである。
〔１〕融点（Ｔｍ）が１１０〜１７５℃であるプロピレン重合体（Ａ）と、下記（ｂ１）〜（ｂ３）を満たし、融点（Ｔｍ）が１００℃未満または観測されないプロピレン重合体（Ｂ）を含む樹脂組成物（Ｘ）からなる光学部品。
（ｂ１）プロピレン由来の構成単位の含量が５１〜９９ｍｏｌ％
（ｂ２）密度が８４０〜８９０ｋｇ／ｍ３
（ｂ３）ガラス転移温度が−５０〜１０℃
〔２〕前記プロピレン重合体（Ａ）と前記プロピレン重合体（Ｂ）が相分離構造を形成されておらず、かつ前記樹脂組成物（Ｘ）の融点（Ｔｍ）（℃）と全組成物におけるプロピレン由来の構成単位の含量（ＸＣ３）（モル％）が下記式（Ｉ）を満たすことを特徴とする〔１〕の光学部品。
Ｔｍ ＞ ３．７５ × ＸＣ３−２０５ ・・・ (Ｉ）
（ただし、式（Ｉ）において、Ｔｍは１４０℃以上である。）
〔３〕前記プロピレン重合体（Ｂ）が、プロピレンとエチレンと炭素数４〜２０のα−オレフィンからなるプロピレン−エチレン−αオレフィン共重合体（Ｂ−１）であることを特徴とする〔１〕または〔２〕の光学部品。
〔４〕前記樹脂組成物（Ｘ）に、光散乱剤を０．１〜３０重量％含まれることを特徴とする〔１〕〜〔３〕に記載の光学部品。
〔５〕前記樹脂組成物（Ｘ）に、プロピレン重合体（Ａ）５０〜９９重量部、プロピレン重合体（Ｂ）１〜５０重量部（ただしプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の合計を１００重量部とする）含まれることを特徴とする〔１〕〜〔４〕の光学部品。
〔６〕前記樹脂組成物（Ｘ）に、プロピレン重合体（Ａ）１０〜４９重量部、プロピレン重合体（Ｂ）９０〜５１重量部（ただしプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の合計を１００重量部とする）含まれることを特徴とする〔１〕〜〔４〕の光学部品。
As a result of intensive studies, the present inventors have found that the above problem can be solved by combining a propylene polymer having specific characteristics and a polypropylene resin. That is, the outline of the present invention is as follows.
[1] A propylene polymer (A) having a melting point (Tm) of 110 to 175 ° C. and a propylene polymer (B) satisfying the following (b1) to (b3) and having a melting point (Tm) of less than 100 ° C. or not observed An optical component comprising a resin composition (X) containing
(B1) The content of structural units derived from propylene is 51 to 99 mol%.
(B2) Density is 840-890 kg / m 3
(B3) Glass transition temperature is −50 to 10 ° C.
[2] The propylene polymer (A) and the propylene polymer (B) do not form a phase separation structure, and the melting point (Tm) (° C.) of the resin composition (X) and the total composition The optical component according to [1], wherein the content (X C3 ) (mol%) of the structural unit derived from propylene satisfies the following formula (I).
Tm> 3.75 × X C3 -205 (I)
(However, in the formula (I), Tm is 140 ° C. or higher.)
[3] The propylene polymer (B) is a propylene-ethylene-α olefin copolymer (B-1) composed of propylene, ethylene and an α-olefin having 4 to 20 carbon atoms [1] ] Or [2] optical components.
[4] The optical component according to [1] to [3], wherein the resin composition (X) contains 0.1 to 30% by weight of a light scattering agent.
[5] In the resin composition (X), 50 to 99 parts by weight of the propylene polymer (A), 1 to 50 parts by weight of the propylene polymer (B) (provided that the propylene polymer (A) and the propylene polymer (B) (1) to [4]. The optical component according to [1] to [4].
[6] In the resin composition (X), 10 to 49 parts by weight of the propylene polymer (A), 90 to 51 parts by weight of the propylene polymer (B) (provided that the propylene polymer (A) and the propylene polymer (B) (1) to [4]. The optical component according to [1] to [4].
本発明の光学部品は、優れた光学特性（光線透過率、散乱光比率）と耐衝撃性と耐傷付き性を有するため、特にLEDランプなどの一次光源を散乱させて照度を均一にするためのカバー材料などの光学部品として好適である。
また、安価かつ容易に成形性可能であるため、家電、車両内層用照明部材等としての光学部品にも好適に適用できる。
The optical component of the present invention has excellent optical properties (light transmittance, scattered light ratio), impact resistance, and scratch resistance, and in particular for scattering the primary light source such as an LED lamp to make the illuminance uniform. It is suitable as an optical component such as a cover material.
Moreover, since it is cheap and easily moldable, it can also be suitably applied to optical components such as household appliances, vehicle inner layer illumination members, and the like.
以下、本発明の実施形態について説明する。
プロピレン重合体（Ａ）
本発明に用いるプロピレン重合体（Ａ）は、示差走査熱量計（ＤＳＣ）測定により得られる融点（Ｔｍ）が、１１０〜１７５℃である。プロピレン重合体（Ａ）は単独で用いても二種以上を併用してもよい。
Hereinafter, embodiments of the present invention will be described.
Propylene polymer (A)
The propylene polymer (A) used in the present invention has a melting point (Tm) obtained by differential scanning calorimeter (DSC) measurement of 110 to 175 ° C. A propylene polymer (A) may be used independently, or may use 2 or more types together.
プロピレン重合体（Ａ）としては、公知のポリプロピレン材料を用いることができ、例えばホモポリプロピレン、プロピレンとエチレンもしくはα−オレフィン（プロピレンを除く）からなる群から選ばれる１種もしくは２種以上とのプロピレンランダム共重合体、プロピレンブロック共重合体、さらにはこれらの混合物などである。α−オレフィン（プロピレンを除く）としては、１-ブテン、１-ペンテン、１-ヘキセン、４-メチル-１-ペンテン、１-オクテン、１-デセン、１-ドデセン、１-テトラデセン、１-ヘキサデセン、１-オクタデセン、１-エイコセン等の炭素数４〜２０のα-オレフィンが挙げられる。 As the propylene polymer (A), a known polypropylene material can be used. For example, homopropylene, propylene and one or more propylene selected from the group consisting of propylene and ethylene or α-olefin (excluding propylene). Random copolymers, propylene block copolymers, and mixtures thereof. As α-olefin (excluding propylene), 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene Examples thereof include α-olefins having 4 to 20 carbon atoms such as 1-octadecene and 1-eicocene.
これらのポリプロピレン材料は用途や目的に応じて適宜選択することができるが、本発明の主目的である透明性の向上を実現するためには、ホモポリプロピレン、プロピレンランダム共重合体が好ましい。 These polypropylene materials can be appropriately selected according to the use and purpose, but homopolypropylene and propylene random copolymer are preferable in order to realize the improvement of transparency which is the main object of the present invention.
プロピレン重合体（Ａ）の立体規則性については、後述するプロピレン重合体（Ｂ）と良好に相容するものであれば、アイソタクチック構造、シンジオタクチック構造どちらも使用することができる。 With respect to the stereoregularity of the propylene polymer (A), both an isotactic structure and a syndiotactic structure can be used as long as they are well compatible with the propylene polymer (B) described later.
プロピレン重合体（Ａ）がアイソタクティックプロピレン系重合体である場合、ＮＭＲ法により測定されたアイソタクティックペンタッド分率（ｍｍｍｍ分率）が９０％以上、好ましくは９５％以上であるものが好適である。 When the propylene polymer (A) is an isotactic propylene polymer, the isotactic pentad fraction (mmmm fraction) measured by NMR method is 90% or more, preferably 95% or more. Is preferred.
ここでアイソタクティックペンタッド分率とは、13Ｃ−ＮＭＲを使用して測定される分子鎖中のペンタッド単位でのアイソタクチック連鎖の存在割合を示しており、プロピレンモノマー単位が５個連続してメソ結合した連鎖の中心にあるプロピレンモノマー単位の分率である。具体的には、13Ｃ−ＮＭＲスペクトルで観測されるメチル炭素領域の全吸収ピーク中に占めるｍｍｍｍピークの分率として算出される値である。 Here, the isotactic pentad fraction indicates the abundance ratio of isotactic chains in the pentad unit in the molecular chain measured using 13C-NMR, and 5 consecutive propylene monomer units are present. The fraction of propylene monomer units at the center of the meso-linked chain. Specifically, it is a value calculated as a fraction of the mmmm peak in the total absorption peak of the methyl carbon region observed in the 13C-NMR spectrum.
なお、このアイソタクティックペンタッド分率（ｍｍｍｍ分率）は、例えば特開２００７−１８６６６４号公報に記載の方法で求めることができる。 In addition, this isotactic pentad fraction (mmmm fraction) can be calculated | required by the method of Unexamined-Japanese-Patent No. 2007-186664, for example.
一方、プロピレン重合体（Ａ）がシンジオタクティックプロピレン系重合体である場合、ＮＭＲ法により測定されたシンジオタクティックペンタッド分率（ｒｒｒｒ）が８５％以上、好ましくは９０％以上であるものが好適である。 On the other hand, when the propylene polymer (A) is a syndiotactic propylene polymer, the syndiotactic pentad fraction (rrrr) measured by NMR method is 85% or more, preferably 90% or more. Is preferred.
なお、このシンジオタクティックペンタッド分率（ｒｒｒｒ）は、例えば特開２００８−１６９３１６号公報に記載の方法で求めることができる。 In addition, this syndiotactic pentad fraction (rrrr) can be calculated | required by the method of Unexamined-Japanese-Patent No. 2008-169316, for example.
プロピレン重合体（Ａ）は、示差走査熱量計（ＤＳＣ）測定により得られる融点（Ｔｍ）が、１１０〜１７５℃、好ましくは１２０〜１７５℃、より好ましくは１３０〜１７５℃であり、さらに同時に解析される融解熱量（ΔＨ）は通常３０〜１５０Ｊ／ｇ、好ましくは４０〜１５０Ｊ／ｇ、より好ましくは５０〜１５０Ｊ／ｇである。 The propylene polymer (A) has a melting point (Tm) obtained by differential scanning calorimetry (DSC) measurement of 110 to 175 ° C., preferably 120 to 175 ° C., more preferably 130 to 175 ° C., and analysis at the same time. The heat of fusion (ΔH) is usually 30 to 150 J / g, preferably 40 to 150 J / g, more preferably 50 to 150 J / g.
プロピレン系重合体（Ａ）の特性がこの範囲にあると、成形性、耐熱性などにおいて実用上充分な性能が発現する。 When the characteristics of the propylene polymer (A) are within this range, practically sufficient performance is exhibited in moldability, heat resistance and the like.
また、プロピレン重合体（Ａ）のメルトフローレート（ＭＦＲ；ＡＳＴＭ Ｄ１２３８、２３０℃、２．１６ｋｇ荷重下）については目的や用途に応じて適宜選択できるが、通常０．０１〜１０００ｇ／１０分、好ましくは０．１〜２００ｇ／１０分、より好ましくは０．１〜１００ｇ／１０ｍｉｎである。このようなＭＦＲ値に調整するために、ＭＦＲの低いプロピレン重合体（Ａ）に有機過酸化物を添加し、高温下で溶融混合させてＭＦＲを高くすることも可能である。 Further, the melt flow rate (MFR; ASTM D1238, 230 ° C., under 2.16 kg load) of the propylene polymer (A) can be appropriately selected according to the purpose and use, but is usually 0.01 to 1000 g / 10 min. Preferably it is 0.1-200 g / 10min, More preferably, it is 0.1-100 g / 10min. In order to adjust to such an MFR value, it is also possible to increase the MFR by adding an organic peroxide to the propylene polymer (A) having a low MFR and melt-mixing it at a high temperature.
プロピレン重合体（Ａ）を得るために用いられる触媒は特に限定されるものではなく公知の触媒が使用可能である。例えば、チタン化合物と有機アルミニウムとを組み合わせてなるチーグラー・ナッタ触媒、あるいはメタロセン触媒などが挙げられる。 The catalyst used for obtaining the propylene polymer (A) is not particularly limited, and a known catalyst can be used. For example, a Ziegler-Natta catalyst or a metallocene catalyst formed by combining a titanium compound and organic aluminum can be used.
プロピレン重合体（Ｂ）
本発明に用いるプロピレン重合体（Ｂ）は、下記（ｂ１）〜（ｂ３）を満たし、示差走査熱量計（ＤＳＣ）測定において融点（Ｔｍ）が１００℃未満または観測されない。プロピレン重合体（Ｂ）は単独で用いても二種以上を併用してもよい。
Propylene polymer (B)
The propylene polymer (B) used in the present invention satisfies the following (b1) to (b3), and the melting point (Tm) is less than 100 ° C. or is not observed in the differential scanning calorimeter (DSC) measurement. A propylene polymer (B) may be used independently, or may use 2 or more types together.
（ｂ１）プロピレン由来の構成単位の含量（プロピレン含量）が５１〜９９ｍｏｌ％、（好ましくは５５〜８９ｍｏｌ％、より好ましくは６０〜８９ｍｏｌ％、さらに好ましくは６０〜８５ｍｏｌ％）
（ｂ２）ＡＳＴＭ Ｄ−１５０５に準拠して測定される密度が８４０〜８９０ｋｇ／ｍ３（好ましくは８５０〜８８５ｋｇ／ｍ３、より好ましくは８５５〜８７５ｋｇ／ｍ３）
（ｂ３）示差走査熱量計（ＤＳＣ）測定により得られるガラス転移温度が−５０〜１０℃、（好ましくは−５０〜−０℃、より好ましくは−５０〜−１０℃。さらに好ましくは−４０〜−２０℃）
(B1) The content of propylene-derived structural units (propylene content) is 51 to 99 mol% (preferably 55 to 89 mol%, more preferably 60 to 89 mol%, still more preferably 60 to 85 mol%).
(B2) A density measured according to ASTM D-1505 is 840 to 890 kg / m 3 (preferably 850 to 885 kg / m 3 , more preferably 855 to 875 kg / m 3 ).
(B3) Glass transition temperature obtained by differential scanning calorimeter (DSC) measurement is −50 to 10 ° C. (preferably −50 to −0 ° C., more preferably −50 to −10 ° C., more preferably −40 to 40 ° C. -20 ° C)
このようなプロピレン重合体（Ｂ）は、プロピレン重合体（Ａ）と熱力学的に相溶し、柔軟でありかつ低温でも脆化しにくい重合体である。ここで「熱力学的に相溶する」とは、プロピレン重合体（Ａ）とプロピレン重合体（Ｂ）とを両成分の融点以上で混合した際（例えば溶融混練する際、または溶媒中で混合した後に溶媒を除去する際）に相分離を起こさないことを意味する。なお、プロピレン重合体（Ｂ）の融点が観測されないときは、プロピレン重合体（Ａ）とプロピレン重合体（Ｂ）とをプロピレン重合体（Ａ）の融点以上で混合した際に相分離を起こさないことを意味する。 Such a propylene polymer (B) is a polymer that is thermodynamically compatible with the propylene polymer (A), is flexible, and does not easily become brittle even at low temperatures. Here, “thermodynamically compatible” means that the propylene polymer (A) and the propylene polymer (B) are mixed at a melting point or higher of both components (for example, when melt kneaded or mixed in a solvent). Means that no phase separation occurs when the solvent is removed). When the melting point of the propylene polymer (B) is not observed, no phase separation occurs when the propylene polymer (A) and the propylene polymer (B) are mixed at a temperature equal to or higher than the melting point of the propylene polymer (A). Means that.
プロピレン重合体（Ｂ）の融点（Ｔｍ）は、１００℃未満、好ましくは３０〜８０℃、より好ましくは３０〜７０℃、さらに好ましくは３０〜６０℃であるか、観測されない。なお、プロピレン重合体（Ｂ）において、融点が観測されないということは、プロピレン重合体（Ｂ）の結晶化度がほぼゼロであることを意味する。 The melting point (Tm) of the propylene polymer (B) is less than 100 ° C, preferably 30 to 80 ° C, more preferably 30 to 70 ° C, still more preferably 30 to 60 ° C, or is not observed. In the propylene polymer (B), the fact that the melting point is not observed means that the crystallinity of the propylene polymer (B) is almost zero.
また、融点が観測されない（結晶化度がほぼゼロである）プロピレン重合体（Ｂ）であっても本発明の目的（透明性と耐衝撃性との両立）は達せられるが、該プロピレン重合体（Ｂ）を用いた成形体は表面のべたつきが強くなる場合がある。成形体の表面のべたつきを抑える観点からは、プロピレン重合体（Ｂ）の融点（Ｔｍ）は、１００℃未満、好ましくは３０〜８０℃、より好ましくは３０〜７０℃、さらに好ましくは３０〜６０℃であることが望ましい。 Further, the propylene polymer (B) in which the melting point is not observed (crystallinity is almost zero) can achieve the object of the present invention (coexistence of transparency and impact resistance). The molded body using (B) may have a strong surface stickiness. From the viewpoint of suppressing the stickiness of the surface of the molded body, the melting point (Tm) of the propylene polymer (B) is less than 100 ° C, preferably 30 to 80 ° C, more preferably 30 to 70 ° C, and further preferably 30 to 60 ° C. It is desirable to be at ° C.
なお、本発明に用いるプロピレン重合体（Ｂ）の融点がこのような範囲にあると、室温や４０℃前後で流動する場合があり、ペレットとしての取り扱いが困難になることがある。このようなときには、プロピレン重合体（Ｂ）にプロピレン重合体（Ａ）を少量、例えば５〜３０ｗｔ％配合することで安定な形状を保つペレットとして取り扱うことができる。 In addition, when the melting point of the propylene polymer (B) used in the present invention is in such a range, it may flow at room temperature or around 40 ° C., and handling as pellets may be difficult. In such a case, the propylene polymer (A) can be handled as pellets that maintain a stable shape by blending the propylene polymer (A) with a small amount, for example, 5 to 30 wt%, in the propylene polymer (B).
本発明で用いるような結晶化度の低いプロピレン重合体（Ｂ）の融点は、プロピレン重合体（Ｂ）の固体構造形成条件（例えば冷却温度、固体構造形成後の養生時間）によって影響を受けやすく、以下のような方法で測定される値として定義される。 The melting point of the propylene polymer (B) having a low crystallinity as used in the present invention is easily affected by the solid structure forming conditions (for example, cooling temperature, curing time after forming the solid structure) of the propylene polymer (B). Is defined as a value measured by the following method.
２３℃±２℃で７２時間以上の状態調節を実施した後の試験体について、−４０℃以下まで冷却してから昇温速度１０℃／ｍｉｎで測定したときに得られるＤＳＣ曲線において、融解ピークＴｍ（Ａ）を観測する。ここで、融点が観測されないとは、示差走査熱量計（ＤＳＣ）測定の際、−４０〜２００℃の範囲において結晶融解熱量が１Ｊ／ｇ以上の結晶融解ピークが観測されない場合である。 In the DSC curve obtained when the specimen after condition adjustment for 72 hours or more at 23 ° C. ± 2 ° C. was cooled to −40 ° C. or lower and measured at a heating rate of 10 ° C./min, the melting peak Observe Tm (A). Here, the case where the melting point is not observed is a case where a crystal melting peak having a heat of crystal melting of 1 J / g or more is not observed in the range of −40 to 200 ° C. in the differential scanning calorimeter (DSC) measurement.
プロピレン重合体（Ｂ）が（ｂ１）の要件を満たすことは、プロピレン重合体（Ａ）とプロピレン重合体（Ｂ）とが熱力学的に相溶することを担保する。同時に、本発明のプロピレン重合体（Ｂ）が（ｂ１）の要件を満たすことで、ポリプロピレン材料の耐衝撃性を向上させるに充分な柔軟性を付与できる。 The propylene polymer (B) satisfying the requirement (b1) ensures that the propylene polymer (A) and the propylene polymer (B) are thermodynamically compatible. At the same time, the propylene polymer (B) of the present invention satisfies the requirement (b1), so that sufficient flexibility can be imparted to improve the impact resistance of the polypropylene material.
プロピレン重合体（Ｂ）が（ｂ２）、（ｂ３）の要件を満たすことは、プロピレン重合体（Ｂ）の結晶性（結晶化度）が低く柔軟な材料であり、耐衝撃性を向上させる能力を有することを意味する。 The fact that the propylene polymer (B) satisfies the requirements of (b2) and (b3) is a soft material with low crystallinity (crystallinity) of the propylene polymer (B) and the ability to improve impact resistance. It means having.
プロピレン重合体（Ｂ）としては、プロピレン単独重合体、プロピレンとエチレンおよびα−オレフィン（プロピレンを除く）からなる群から選ばれる１種もしくは２種以上とのプロピレン共重合体などである。α−オレフィン（プロピレンを除く）としては、１-ブテン、１-ペンテン、１-ヘキセン、４-メチル-１-ペンテン、１-オクテン、１-デセン、１-ドデセン、１-テトラデセン、１-ヘキサデセン、１-オクタデセン、１-エイコセン等の炭素数４〜２０のα-オレフィンが挙げられる。プロピレン重合体（Ｂ）としては、プロピレンとエチレンと炭素数４〜２０のα−オレフィンとから得られるプロピレン−エチレン−αオレフィン共重合体（Ｂ−１）が好適に用いられる。 Examples of the propylene polymer (B) include a propylene homopolymer, a propylene copolymer of one or more selected from the group consisting of propylene, ethylene, and α-olefin (excluding propylene). As α-olefin (excluding propylene), 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene Examples thereof include α-olefins having 4 to 20 carbon atoms such as 1-octadecene and 1-eicocene. As the propylene polymer (B), a propylene-ethylene-α olefin copolymer (B-1) obtained from propylene, ethylene and an α-olefin having 4 to 20 carbon atoms is preferably used.
要件（ｂ１）〜（ｂ３）を全て満たすようなプロピレン重合体（Ｂ）のより好ましい形態として、以下のようなプロピレン・エチレン・α−オレフィン共重合体（Ｂ−１）が挙げられる。このようなプロピレン・エチレン・α−オレフィン共重合体（Ｂ−１）は、以下の（ｂ４）〜（ｂ８）のうち、いずれか１つを満たすものが好ましく、より好ましくは複数の条件を満たす共重合体である。特に好ましい共重合体はこれらの条件を全て満たすものである。 As a more preferable form of the propylene polymer (B) satisfying all the requirements (b1) to (b3), the following propylene / ethylene / α-olefin copolymer (B-1) may be mentioned. Such a propylene / ethylene / α-olefin copolymer (B-1) preferably satisfies any one of the following (b4) to (b8), and more preferably satisfies a plurality of conditions. It is a copolymer. Particularly preferred copolymers satisfy all these conditions.
（ｂ４）ＡＳＴＭ Ｄ−２２４０に準拠して測定されるショアーＡ硬度が１０〜９５（好ましくは２０〜９０、より好ましくは３０〜８５）
ここでショアーＡ硬度は、プロピレン重合体（Ｂ）を１９０〜２３０℃で加熱溶融させた後１５〜２５℃の冷却温度でプレス成形して得られた試験体を、２３℃±２℃の環境下で７２時間以上保管した後、Ａ型測定器を用い、押針接触後直ちに目盛りを読み取ることによって得られる値である。また密度は上記ショアーＡ硬度測定の手順と同様の方法で調整された試験体で測定した値である。
(B4) Shore A hardness measured according to ASTM D-2240 is 10 to 95 (preferably 20 to 90, more preferably 30 to 85)
Here, the Shore A hardness is an environment of 23 ° C. ± 2 ° C. of a test body obtained by heating and melting the propylene polymer (B) at 190 ° C. to 230 ° C. and then press molding at a cooling temperature of 15 to 25 ° C. It is a value obtained by reading the scale immediately after touching the needle using an A-type measuring instrument after storing for 72 hours or more below. The density is a value measured with a test specimen prepared by the same method as the Shore A hardness measurement procedure.
（ｂ５）プロピレン由来の構成単位を５１〜９０モル％（好ましくは５５〜８９モル％）、エチレン由来の構成単位を７〜２４モル％（好ましくは８〜２０モル％）、炭素数４〜２０のα−オレフィン由来の構成単位を３〜２５モル％（好ましくは３〜２５モル％）含む（ここでプロピレン由来の構成単位とエチレン由来の構成単位と炭素数４〜２０のαオレフィン由来の構成単位との合計を１００モル％とする）。 (B5) 51 to 90 mol% (preferably 55 to 89 mol%) of propylene-derived structural units, 7 to 24 mol% (preferably 8 to 20 mol%) of ethylene-derived structural units, and 4 to 20 carbon atoms 3 to 25 mol% (preferably 3 to 25 mol%) of a structural unit derived from α-olefin (wherein the structural unit derived from propylene, the structural unit derived from ethylene, and the structural unit derived from an α-olefin having 4 to 20 carbon atoms) The total with the unit is 100 mol%).
（ｂ６）プロピレン重合体（Ａ）がアイソタクティックプロピレン系重合体の場合には、
要件（ｂ６−１）を満たし、シンジオタクティックプロピレン系重合体の場合には要件（ｂ６−２）を満たす。
要件（ｂ６−１）ＮＭＲにより算出したアイソタクティックトライアッド分率（ｍｍ）が６０〜９９．９％（好ましくは８５〜９９．９％、より好ましくは８５〜９９．９％）である。
要件（ｂ６−２）ＮＭＲにより算出したシンジオタクティックトライアッド分率（ｒｒ）が６０％以上（好ましくは７０％以上、より好ましくは７５％以上）である。
ここで、アイソタクティックトライアッド分率（ｍｍ）については、例えば国際公開２００４−０８７７７５号パンフレットの２１頁７行目から２６頁６行目までに記載された方法で求められ、シンジオタクティックトライアッド分率（ｒｒ）については例えば特開２００８−１６９３１６号公報に記載の方法で求めることができる。
(B6) When the propylene polymer (A) is an isotactic propylene polymer,
The requirement (b6-1) is satisfied, and in the case of a syndiotactic propylene polymer, the requirement (b6-2) is satisfied.
Requirement (b6-1) The isotactic triad fraction (mm) calculated by NMR is 60 to 99.9% (preferably 85 to 99.9%, more preferably 85 to 99.9%).
Requirement (b6-2) The syndiotactic triad fraction (rr) calculated by NMR is 60% or more (preferably 70% or more, more preferably 75% or more).
Here, the isotactic triad fraction (mm) is determined by the method described in, for example, International Publication No. 2004-087775, page 21, line 7 to page 26, line 6, and syndiotactic triad fraction. The rate (rr) can be obtained, for example, by the method described in Japanese Patent Application Laid-Open No. 2008-169316.
（ｂ７）下記式（ｂ７−１）で定義されるＢ値が０．８〜１．３（好ましくは０．９〜１．２、より好ましくは０．９〜１．１）である。 (B7) The B value defined by the following formula (b7-1) is 0.8 to 1.3 (preferably 0.9 to 1.2, more preferably 0.9 to 1.1).
式中、ＭOEは、プロピレンとエチレンの連鎖と炭素数４以上のα−オレフィンとエチレンの連鎖の合計の、全ダイアッドに対するモル分率を表し、ＭOはプロピレンと炭素数４以上のα−オレフィンのモル分率の合計を表し、ＭEはエチレンのモル分率を表す。 Wherein, MO E are propylene and ethylene chain and 4 or more carbon atoms α- olefin and the sum of the chain of ethylene, represent mole fractions for all dyads, M O is propylene and having 4 or more carbon atoms of α- Represents the sum of the mole fractions of olefins, and M E represents the mole fraction of ethylene.
（ｂ８）ゲルパーミエーションクロマトグラフィー（ＧＰＣ）により測定した重量平均分子量（Ｍｗ）と数平均分子量（Ｍｎ）との比（Ｍｗ／Ｍｎ）が１．２〜３．５、好ましくは１．４〜３．０、より好ましくは１．６〜２．６である。 (B8) The ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is 1.2 to 3.5, preferably 1.4 to 3.0, more preferably 1.6 to 2.6.
プロピレン重合体（Ｂ）のメルトフローレート（ＭＦＲ；ＡＳＴＭ Ｄ１２３８、２３０℃、２．１６ｋｇ荷重下）については目的や用途に応じて適宜選択できるが、通常０．０１〜１０００ｇ／１０分、好ましくは０．１〜２００ｇ／１０分、より好ましくは０．１〜１００ｇ／１０ｍｉｎである。このようなＭＦＲ値に調整するために、ＭＦＲの低いプロピレン重合体（Ｂ）に有機過酸化物を添加し、高温下で溶融混合させてＭＦＲを高くすることも可能である。
また、プロピレン重合体（Ｂ）は極性モノマーによりグラフト変性することも可能である。
プロピレン重合体（Ｂ）は、例えば国際公開２００４／０８７７７５号パンフレットに記載された方法で製造できる。
The melt flow rate (MFR; ASTM D1238, 230 ° C., under a load of 2.16 kg) of the propylene polymer (B) can be appropriately selected according to the purpose and use, but is usually 0.01 to 1000 g / 10 minutes, preferably 0.1 to 200 g / 10 min, more preferably 0.1 to 100 g / 10 min. In order to adjust to such an MFR value, it is also possible to increase the MFR by adding an organic peroxide to the propylene polymer (B) having a low MFR and melt-mixing it at a high temperature.
The propylene polymer (B) can also be graft-modified with a polar monomer.
A propylene polymer (B) can be manufactured by the method described, for example in the international publication 2004/087775 pamphlet.
樹脂組成物（Ｘ）
本発明における樹脂組成物（Ｘ）とは、前記プロピレン重合体（Ａ）、プロピレン重合体（Ｂ）を含む樹脂組成物であり、本発明の効果を損なわない範囲で、各種添加剤（後に詳述）や他の樹脂など他の成分を含んでいても構わないが、透明性などの点からは、他の成分は少ない方が好ましい。より具体的には、樹脂組成物（Ｘ）におけるプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の合計量が、好ましくは７０〜１００重量％、より好ましくは９０〜１００重量％、さらにより好ましくは９５〜１００重量％である。
Resin composition (X)
The resin composition (X) in the present invention is a resin composition containing the propylene polymer (A) and the propylene polymer (B), and various additives (details will be described later) as long as the effects of the present invention are not impaired. And other resins such as other resins may be included, but from the viewpoint of transparency, the other components are preferably small. More specifically, the total amount of the propylene polymer (A) and the propylene polymer (B) in the resin composition (X) is preferably 70 to 100% by weight, more preferably 90 to 100% by weight, and even more. Preferably it is 95-100 weight%.
ここで、プロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の配合比は目的に応じて任意に設定できるが、例えば、プロピレン重合体（Ａ）５０〜９９重量部、好ましくは６０〜９７重量部、より好ましくは７０〜９０重量部、プロピレン重合体（Ｂ）１〜５０重量部、好ましくは３〜４０重量部、より好ましくは１０〜５０重量部にある場合（ただしプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の合計を１００重量部とする）、光学特性（光線透過率、散乱光比率）と耐衝撃性に加え、剛性と耐熱性を併せ持った好適な成形体が得られる。 Here, the blending ratio of the propylene polymer (A) and the propylene polymer (B) can be arbitrarily set according to the purpose. For example, the propylene polymer (A) is 50 to 99 parts by weight, preferably 60 to 97 parts by weight. Parts, more preferably 70-90 parts by weight, propylene polymer (B) 1-50 parts by weight, preferably 3-40 parts by weight, more preferably 10-50 parts by weight (provided that propylene polymer (A) And a propylene polymer (B) are 100 parts by weight), a suitable molded article having both rigidity and heat resistance in addition to optical properties (light transmittance, scattered light ratio) and impact resistance.
また、プロピレン重合体（Ａ）５〜４９重量部、好ましくは１５〜４５重量部、より好ましくは２０〜４０重量部、プロピレン重合体（Ｂ）９５〜５１重量部、好ましくは８５〜５５重量部、より好ましくは８０〜６０重量部にある場合（ただしプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）の合計を１００重量部とする）、光学特性（光線透過率、散乱光比率）と耐衝撃性に加え、柔軟性と耐熱性を併せ持った好適な成形体が得られる。 The propylene polymer (A) is 5 to 49 parts by weight, preferably 15 to 45 parts by weight, more preferably 20 to 40 parts by weight, and the propylene polymer (B) 95 to 51 parts by weight, preferably 85 to 55 parts by weight. More preferably, when it is 80 to 60 parts by weight (provided that the total of propylene polymer (A) and propylene polymer (B) is 100 parts by weight), optical properties (light transmittance, scattered light ratio) and resistance In addition to impact properties, a suitable molded product having both flexibility and heat resistance can be obtained.
本発明のプロピレン重合体（Ｂ）はプロピレン重合体（Ａ）が形成する結晶相（球晶とよばれる）の成長を抑制する働きがあり、プロピレン重合体（Ｂ）の配合量が高くなるほどこの効果が大きくなり、得られる成形体の光線透過率を高くすることが可能になる。 The propylene polymer (B) of the present invention has a function of suppressing the growth of the crystal phase (called spherulite) formed by the propylene polymer (A), and the higher the blending amount of the propylene polymer (B), the more An effect becomes large and it becomes possible to make the light transmittance of the molded object obtained high.
とりわけ、光学部品の材料という観点からは、樹脂組成物（Ｘ）の成分である前記プロピレン重合体（Ａ）とプロピレン重合体（Ｂ）が熱力学的に相溶していることが好ましい。これは樹脂組成物（Ｘ）の成形品の構造を顕微鏡（例えば透過型電子顕微鏡（ＴＥＭ））で観察しても、エラストマー（いわゆる軟質ポリマー成分）に起因する相分離構造が観察されないことを意味する。具体的には、前記プロピレン重合体（Ａ）が形成するマトリックス中に、本発明のプロピレン重合体（Ｂ）が０．１μｍ以上、好ましくは０．０５μｍ以上の分散相を有さないものとして定義できる。 In particular, from the viewpoint of the material of the optical component, it is preferable that the propylene polymer (A) and the propylene polymer (B) which are components of the resin composition (X) are thermodynamically compatible. This means that even when the structure of the molded product of the resin composition (X) is observed with a microscope (for example, a transmission electron microscope (TEM)), a phase separation structure due to the elastomer (so-called soft polymer component) is not observed. To do. Specifically, in the matrix formed by the propylene polymer (A), the propylene polymer (B) of the present invention is defined as having no dispersed phase of 0.1 μm or more, preferably 0.05 μm or more. it can.
また本発明の樹脂組成物（Ｘ）は、プロピレン重合体（Ａ）成分由来の示差走査熱量計（ＤＳＣ）測定により得られる融点（Ｔｍ）が１１０〜１７５℃、好ましくは１１５〜１７０℃、より好ましくは１３５〜１７０℃であり、さらに、次式（I）を満たすものが特に好ましい。
Ｔｍ ＞ ３．７５ × ＸＣ３−２０５ ・・・ (I）
（ここでＴｍは樹脂組成物（Ｘ）の融点（℃）、ＸＣ３はプロピレン重合体（Ａ）とプロピレン重合体（Ｂ）からなる樹脂成分中のプロピレン含量（モル％）をあらわす。）
Further, the resin composition (X) of the present invention has a melting point (Tm) obtained by differential scanning calorimeter (DSC) measurement derived from the propylene polymer (A) component of 110 to 175 ° C, preferably 115 to 170 ° C. Preferably it is 135-170 degreeC, and also what satisfy | fills following formula (I) is especially preferable.
Tm> 3.75 × X C3 -205 (I)
(Where Tm is the melting point of the resin composition (X) (° C.), X C3 propylene polymer (A) and the propylene polymer (B) propylene content of the resin component consisting of (representing the mol%).)
従来の技術では、一般に材料の透明性を向上させるために、ポリプロピレン樹脂としてコモノマー含量の多い（すなわちプロピレン含量の少ない）プロピレンとエチレンもしくはα−オレフィンとのランダム共重合体が用いられてきたが、この場合、プロピレン含量の低下とともにポリプロピレン材料の融点の低下は避けられない。これに対し本発明の透明ポリプロピレン樹脂組成物であって、特に式（I）を満たすものは透明性と耐衝撃性に加え、耐熱性も併せ持っていることを意味する。 In the prior art, in order to improve the transparency of the material, a random copolymer of propylene and ethylene or α-olefin having a large comonomer content (that is, having a small propylene content) has been used as a polypropylene resin. In this case, a decrease in the melting point of the polypropylene material is unavoidable with a decrease in the propylene content. On the other hand, the transparent polypropylene resin composition of the present invention, particularly satisfying the formula (I), means that it has heat resistance in addition to transparency and impact resistance.
樹脂組成物（Ｘ）からなる光学部品
本発明の光学部品は、例えばブロー成形法、射出成形法、プレス成形法、押出成形法、インフレーション成形法などの公知の成形機により加工することができ、加工時あるいは加工後に延伸することも可能である。
このとき、前記プロピレン重合体（Ａ）、プロピレン重合体（Ｂ）成分を公知の混練機、例えば、ヘンシェルミキサー、スーパーミキサー、リボンブレンダー等に投入して混合した後、通常の単軸押出機、二軸押出機、バンバリーミキサー、ロール等で１７０〜３２０℃の温度範囲で溶融混練して均一な樹脂組成物を形成してから前記成形機で成形してもよく、またこのような混練工程を経ずに、前記プロピレン重合体（Ａ）、プロピレン重合体（Ｂ）成分によって形成されるペレットをドライブレンドして前記成形機で成形することも可能である。
Optical component comprising resin composition (X) The optical component of the present invention is processed by a known molding machine such as a blow molding method, an injection molding method, a press molding method, an extrusion molding method or an inflation molding method. It is also possible to stretch during or after processing.
At this time, after the propylene polymer (A) and the propylene polymer (B) component are mixed in a known kneader, for example, a Henschel mixer, a super mixer, a ribbon blender, etc., a normal single-screw extruder, A uniform resin composition may be formed by melting and kneading in a temperature range of 170 to 320 ° C. with a twin screw extruder, Banbury mixer, roll, etc., and then molded by the molding machine. Without passing through, the pellets formed by the propylene polymer (A) and propylene polymer (B) components may be dry blended and molded by the molding machine.
本発明の光学部品としては、必要に応じて光学特性を制御するための光散乱剤等を樹脂組成物（Ｘ）に配合してもよい。このような光散乱剤としては、有機フィラー、無機フィラーなど公知の光散乱剤が適用できるが、例えば、硫酸バリウム、硫化亜鉛、酸化亜鉛、酸化チタン、炭酸カルシウム、水酸化マグネシウム、シリカ、タルク、ガラスパウダーなどが例示でき、これらを複数組み合わせてもよい。透明性の点からは、添加剤の配合量が少ない方が好ましいことは先に述べたが、本発明においては、光散乱剤の添加量が少なくても優れた光学特性を得ることができ、樹脂組成物（Ｘ）における光産卵財の好ましい配合量は、０．１〜１０重量％、より好ましくは０．１〜５重量％である。
また、本発明の光学部品として、樹脂組成物（Ｘ）に公知の耐候安定剤や光安定剤を配合した形態が好ましい。このような耐候安定剤としてはベンゾトリアゾール系、ベンゾフェノン系、サリシレート系、シアノアクリルレート系、ニッケル系、トリアジン系等が挙げられる。また光安定剤としてはヒンダードアミン系光安定剤等が挙げられる。
さらに、本発明の光学部品には、本発明の目的を損なわない範囲で、樹脂組成物（Ｘ）にエチレン系エラストマー、スチレン系エラストマー、耐熱安定剤、帯電防止剤、スリップ剤、アンチブロッキング剤、防曇剤、核剤、滑剤、顔料、染料、可塑剤、老化防止剤、塩酸吸収剤、酸化防止剤等の添加剤が必要に応じて配合されていてもよい。
As the optical component of the present invention, a light scattering agent or the like for controlling optical properties may be blended in the resin composition (X) as necessary. As such a light scattering agent, known light scattering agents such as organic fillers and inorganic fillers can be applied. For example, barium sulfate, zinc sulfide, zinc oxide, titanium oxide, calcium carbonate, magnesium hydroxide, silica, talc, A glass powder etc. can be illustrated and you may combine these two or more. From the viewpoint of transparency, it has been described earlier that a smaller amount of additive is preferable, but in the present invention, excellent optical characteristics can be obtained even if the amount of light scattering agent is small, The preferable compounding quantity of the light egg-laying goods in resin composition (X) is 0.1 to 10 weight%, More preferably, it is 0.1 to 5 weight%.
Moreover, as an optical component of the present invention, a form in which a known weather stabilizer or light stabilizer is blended with the resin composition (X) is preferable. Examples of such a weather resistance stabilizer include benzotriazole, benzophenone, salicylate, cyanoacrylate, nickel, and triazine. Examples of the light stabilizer include hindered amine light stabilizers.
Furthermore, in the optical component of the present invention, an ethylene elastomer, a styrene elastomer, a heat stabilizer, an antistatic agent, a slip agent, an antiblocking agent, a resin composition (X), as long as the object of the present invention is not impaired. Additives such as an antifogging agent, a nucleating agent, a lubricant, a pigment, a dye, a plasticizer, an anti-aging agent, a hydrochloric acid absorbent, and an antioxidant may be blended as necessary.
本発明の光学部品は、例えば、家電・住宅用照明器具のカバー、自動車内装照明カバー、電気・電子部品におけるＬＥＤランプカバー、その他表示装置のカバー等に好適に用いることができる。 The optical component of the present invention can be suitably used, for example, as a cover for lighting fixtures for home appliances / houses, an interior lighting cover for automobiles, an LED lamp cover for electrical / electronic components, and a cover for other display devices.
以下に、本発明を実施例により、さらに具体的に説明するが、本願発明はこれら実施例に限定されるものではない。 EXAMPLES The present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
１．樹脂組成物（Ｘ）の成形品としての性能評価のための評価項目
（１）光学特性
実施例または比較例に記載の方法で成形した角板（厚さ２ｍｍ）について、日本電色工業（株）製のデジタル濁度計「ＮＤＨ−２０００」、Ｃ光源を用いて拡散透過光量および全透過光量を測定し、下式によりヘイズ、全光線透過率を計算した。
ヘイズ（％）＝１００×（拡散透過光量）／（全透過光量）
1. Evaluation Items for Performance Evaluation as Resin Composition (X) Molded Product (1) Optical Characteristics About Nippon Denko Kogyo Co., Ltd. for square plates (thickness 2 mm) molded by the method described in Examples or Comparative Examples. ) The turbidity transmitted light amount and the total transmitted light amount were measured using a digital turbidimeter “NDH-2000” manufactured by KK) and a C light source, and the haze and the total light transmittance were calculated by the following equations.
Haze (%) = 100 × (diffuse transmitted light amount) / (total transmitted light amount)
（２）耐衝撃性
実施例または比較例に記載の方法で成形した射出スペシメン（厚み３ｍｍのノッチつき試験片）を用い、ＡＳＴＭＤ２５６に従い０℃及び２３℃のアイゾット衝撃強度を求めた。
(2) Impact resistance Izod impact strength at 0 ° C. and 23 ° C. was determined according to ASTM D256 using an injection specimen (a test piece with a notch having a thickness of 3 mm) molded by the method described in Examples or Comparative Examples.
（３）引張り試験
実施例または比較例に記載の方法で成形した射出スペシメン（厚み３ｍｍのＡＳＴＭ−IV号形状試験片）を用い、ＡＳＴＭ Ｄ６３８に準拠し、引張り速度＝５０ｍｍ／ｍｉｎで測定を行い、降伏点応力（ＹＳ）、破断点応力（ＴＳ）、破断点の伸び（ＥＬ）、引張り弾性率（ＹＭ）を解析した。
(3) Tensile test Using an injection specimen (ASTM-IV shape test piece having a thickness of 3 mm) molded by the method described in the examples or comparative examples, measurement is performed at a tensile rate of 50 mm / min in accordance with ASTM D638. , Yield stress (YS), stress at break (TS), elongation at break (EL), and tensile modulus (YM) were analyzed.
（４）融点
実施例または比較例に記載の方法で成形した射出スペシメンから採取したサンプルについて、パーキンエルマー社製のＤＳＣ測定装置を用いて、２３℃から昇温速度２０℃／ｍｉｎで測定し、観測される融解ピークのうち、最大熱流量に対応するものを樹脂組成物（Ｘ）の融点とした。
(4) Melting point About the sample collected from the injection specimen molded by the method described in the examples or comparative examples, using a DSC measuring device manufactured by Perkin Elmer, measured from 23 ° C. at a rate of temperature increase of 20 ° C./min. Among the observed melting peaks, the one corresponding to the maximum heat flow was defined as the melting point of the resin composition (X).
（５）相分離構造の有無
成形した角板のコア部分から採取した切片をルテニウム酸にて染色し、透過型電子顕微鏡（ＴＥＭ）で観察し、相分離構造の有無を確認した。
なお、実施例および比較例で得られた成形体すべてについて確認してはいないが、相分離構造が確認されないと判断可能なものについてはＮ．Ｔ．（Ｎｏｔ Ｔｅｓｔｅｄ）で標記した。
(5) Presence / absence of phase separation structure A section collected from the core portion of the molded square plate was stained with ruthenic acid and observed with a transmission electron microscope (TEM) to confirm the presence or absence of the phase separation structure.
In addition, although it did not confirm about all the molded objects obtained by the Example and the comparative example, about what can be judged that a phase-separation structure is not confirmed, it is N.N. T.A. Marked with (Not Tested).
２．実施例および比較例で用いた原料
（１）プロピレン重合体（Ａ）
（表１）に示したホモポリプロピレン（ｈＰＰ、プライムポリマー製Ｊ１０６Ｇ）を用いた。これらの物性値は以下の方法で測定した。
2. Raw material (1) propylene polymer (A) used in Examples and Comparative Examples
Homopolypropylene (hPP, J106G manufactured by Prime Polymer) shown in Table 1 was used. These physical property values were measured by the following methods.
［融点］
パーキンエルマー社製のＤＳＣ測定装置を用い、以下の手順で得たＤＳＣ曲線を解析して求めた。
ＤＳＣ測定方法
サンプル試料について、（ｉ）１００℃／分で２００℃まで昇温して、２００℃で５分間保持したのち、（ii）２０℃／分で−２０℃まで降温し、次いで（iii）２０℃／分で２００℃まで昇温した。（iii）で得られた吸熱曲線を解析して求めた。
[Melting point]
The DSC curve obtained by the following procedure was analyzed and obtained using a DSC measuring apparatus manufactured by PerkinElmer.
DSC measurement method For the sample sample, (i) the temperature was raised to 200 ° C at 100 ° C / min and held at 200 ° C for 5 minutes, and then (ii) the temperature was lowered to -20 ° C at 20 ° C / min. Then, (iii) the temperature was raised to 200 ° C. at 20 ° C./min. The endothermic curve obtained in (iii) was analyzed and determined.
［メルトフローレート（ＭＦＲ）］
ＡＳＴＭＤ１２３８に準拠し、２３０℃、２．１６ｋｇ荷重下で測定した。
[Melt flow rate (MFR)]
Based on ASTM D1238, measurement was performed at 230 ° C. and a load of 2.16 kg.
（２）プロピレン重合体（Ｂ）
表．２に示したプロピレン・エチレン・１−ブテン共重合体（ＰＢＥＲ）を用いた。これらの物性値は以下の方法で測定した。
(2) Propylene polymer (B)
table. The propylene / ethylene / 1-butene copolymer (PBER) shown in 2 was used. These physical property values were measured by the following methods.
［プロピレン含量およびコモノマー含量］
１３Ｃ−ＮＭＲスペクトルの解析により求めた。
[Propylene content and comonomer content]
It was determined by analysis of 13C-NMR spectrum.
［ショアーＡ硬度］
１９０℃に設定した油圧式熱プレス成形機を用いて５分余熱した後２分間加圧、すぐに２０℃に設定した冷却槽で４分間冷却して３ｍｍ厚みのプレスシートを作製した。これを２３℃±２℃の環境下で７２時間保管した後、Ａ型測定器を用い、押針接触後直ちに目盛りを読み取った（ＡＳＴＭ Ｄ−２２４０に準拠）。
なお、プレス成形の際には離型フィルムとして、１００μｍＰＥＴフィルム（東レ製、ルミラー）を使用した。
[Shore A hardness]
After heating for 5 minutes using a hydraulic hot press molding machine set at 190 ° C., pressurization was performed for 2 minutes and immediately cooled in a cooling tank set at 20 ° C. for 4 minutes to produce a 3 mm thick press sheet. This was stored for 72 hours in an environment of 23 ° C. ± 2 ° C., and the scale was read immediately after contact with the needle using an A-type measuring instrument (according to ASTM D-2240).
In press molding, a 100 μm PET film (manufactured by Toray, Lumirror) was used as a release film.
［密度］
ショアーＡ硬度測定に用いたものと同一の条件で作製したプレスシートから切り出したサンプルについて、ＡＳＴＭ Ｄ−１５０５に準拠した方法で測定した。
[density]
A sample cut out from a press sheet produced under the same conditions as those used for Shore A hardness measurement was measured by a method based on ASTM D-1505.
［融点、ガラス転移温度］
パーキンエルマー社製のＤＳＣ測定装置を用い、以下の手順で得たＤＳＣ曲線を解析して求めた。
プロピレン重合体（Ｂ）のＤＳＣ測定方法
ショアーＡ硬度測定に用いたものと同一の条件で作製したプレスシートから切り出したサンプルについて、２３℃±２℃で７２時間以上の状態調節を実施した後、−４０℃まで冷却してから昇温速度１０℃／ｍｉｎで測定してＤＳＣ曲線を得た。
[Melting point, glass transition temperature]
The DSC curve obtained by the following procedure was analyzed and obtained using a DSC measuring apparatus manufactured by PerkinElmer.
DSC measurement method of propylene polymer (B) After carrying out state adjustment for 72 hours or more at 23 degreeC ± 2 degreeC about the sample cut out from the press sheet produced on the same conditions as what was used for Shore A hardness measurement, After cooling to −40 ° C., a DSC curve was obtained by measuring at a heating rate of 10 ° C./min.
［分子量分布（Ｍｗ／Ｍｎ）］
ＧＰＣ（ゲルパーミエーションクロマトグラフィー）を用い、オルトジクロロベンゼン溶媒（移動相）とし、カラム温度１４０℃で測定した（ポリスチレン換算、Ｍｗ：重量平均分子量、Ｍｎ：数平均分子量）。具体的には分子量分布（Ｍｗ／Ｍｎ）は、Waters社製ゲル浸透クロマトグラフAlliance GPC- 2000型を用い、以下のようにして測定した。分離カラムは、TSKgel GNH6-HTを2本、およびTSKgel GNH6-HTLを2本であり、カラムサイズはいずれも直径7.5 mm、長さ300 mmであり、カラム温度は140 ℃とし、移動相にはo-ジクロロベンゼン（和光純薬工業）および酸化防止剤としてBHT（武田薬品）0.025重量%を用いて、1.0 ml／分で移動させ、試料濃度は15 mg／10 mlとし、試料注入量は500マイクロリットルとし、検出器として示差屈折計を用いた。標準ポリスチレンは、分子量がMw ＜1000、およびMw ＞4×106については東ソー社製を用いて、1000 ≦ Mw ≦4×106についてはプレッシャーケミカル社製を用いた。
[Molecular weight distribution (Mw / Mn)]
GPC (gel permeation chromatography) was used as an orthodichlorobenzene solvent (mobile phase) and measured at a column temperature of 140 ° C. (polystyrene conversion, Mw: weight average molecular weight, Mn: number average molecular weight). Specifically, the molecular weight distribution (Mw / Mn) was measured as follows using a gel permeation chromatograph Alliance GPC-2000 model manufactured by Waters. The separation columns are two TSKgel GNH6-HT and two TSKgel GNH6-HTL.The column size is 7.5 mm in diameter and 300 mm in length, the column temperature is 140 ° C, and the mobile phase is Using o-dichlorobenzene (Wako Pure Chemical Industries) and 0.025% by weight of BHT (Takeda Pharmaceutical) as an antioxidant, it was moved at 1.0 ml / min, the sample concentration was 15 mg / 10 ml, and the sample injection volume was 500 A microliter was used, and a differential refractometer was used as a detector. The standard polystyrene used was manufactured by Tosoh Corporation for molecular weights of Mw <1000 and Mw> 4 × 106, and that of Pressure Chemical Co. was used for 1000 ≦ Mw ≦ 4 × 106.
［立体規則性（ｍｍ）］
国際公開第２００４−０８７７７５号パンフレットの２１頁７行目〜２６頁６行目に記載された方法に従って、１３Ｃ−ＮＭＲスペクトルの解析により求めた。
[Stereoregularity (mm)]
It was determined by analysis of 13C-NMR spectrum according to the method described in International Publication No. 2004-087775, page 21, line 7 to page 26, line 6.
［Ｂ値］
特開２００７−１８６６６４号公報に記載された方法に従って、１３Ｃ−ＮＭＲスペクトルの解析により求めた。
[B value]
According to the method described in JP2007-186664A, it was determined by analysis of 13C-NMR spectrum.
［メルトフローレート（ＭＦＲ）］
ＡＳＴＭＤ１２３８に準拠し、２３０℃、２．１６ｋｇ荷重下で測定した。
なお、このようなプロピレン・エチレン・１−ブテン共重合体は、例えば、重合用触媒／助触媒として、特開２００７−１８６６６４号公報に記載の方法で調製したジフェニルメチレン(3-tert-ブチル-5-エチルシクロペンタジエニル)(2,7-ジ-tert-ブチルフルオレニル)ジルコニウムジクロリド／メチルアルミノキサン（東ソー・ファインケム社製、アルミニウム換算で０．３ｍｍｏｌ）と、原料となるエチレン、プロピレン、１−ブテンを、連続重合設備を用いてヘキサン溶液中で重合して得ることができる。
[Melt flow rate (MFR)]
Based on ASTM D1238, measurement was performed at 230 ° C. and a load of 2.16 kg.
Such a propylene / ethylene / 1-butene copolymer can be prepared by using, for example, diphenylmethylene (3-tert-butyl-diethylene) prepared by the method described in JP-A-2007-186664 as a polymerization catalyst / co-catalyst. 5-ethylcyclopentadienyl) (2,7-di-tert-butylfluorenyl) zirconium dichloride / methylaluminoxane (manufactured by Tosoh Finechem, 0.3 mmol in terms of aluminum) and raw materials ethylene, propylene, 1-butene can be obtained by polymerization in hexane solution using a continuous polymerization facility.
〔実施例１〕
プロピレン重合体（Ａ）であるｈＰＰとプロピレン重合体（Ｂ）であるＰＢＥＲを配合し、内径４０ｍｍの一軸押出機を用いて、樹脂温度約２２０〜２４０℃に保ちながら溶融混練してポリプロピレン樹脂組成物を得た。
次いでこのポリプロピレン樹脂組成物を成形温度２３０℃、金型温度４０℃、保圧時間＝２０秒の条件で射出成形し、２ｍｍ厚みの角板、ならびに耐衝撃性試験および引張り試験評価用スペシメンを成形した。これらの物性値を表．３に示す。
[Example 1]
A polypropylene resin composition is prepared by blending hPP, which is a propylene polymer (A), and PBER, which is a propylene polymer (B), and using a single screw extruder having an inner diameter of 40 mm, melt kneading while maintaining the resin temperature at about 220 to 240 ° C. I got a thing.
Next, this polypropylene resin composition was injection-molded under conditions of a molding temperature of 230 ° C., a mold temperature of 40 ° C., and a holding time of 20 seconds, and a 2 mm thick square plate and a specimen for impact resistance test and tensile test evaluation were molded. did. Table of physical property values. 3 shows.
〔実施例２〕
プロピレン重合体（Ａ）であるｈＰＰとプロピレン重合体（Ｂ）であるＰＢＥＲの配合量を変えた点以外は実施例１と同様の条件で評価用サンプルを作成した。これらの物性値を表．３に示す。
[Example 2]
A sample for evaluation was prepared under the same conditions as in Example 1 except that the blending amounts of hPP as the propylene polymer (A) and PBER as the propylene polymer (B) were changed. Table of physical property values. 3 shows.
〔比較例１〕
プロピレン重合体（Ａ）単体を実施例１と同様の条件で射出成形し評価用サンプルを作成した。これらの物性値を（表３）に示す。
[Comparative Example 1]
A propylene polymer (A) simple substance was injection molded under the same conditions as in Example 1 to prepare a sample for evaluation. These physical property values are shown in (Table 3).
〔比較例２〕
プロピレン重合体（Ａ）単体に透明核剤（新日本理化株式会社のビス（メチルベンジリデン）ソルビトール（商品名：ゲルオールＭＤ））を２０００ｐｐｍ配合したものを実施例１と同様の条件で射出成形し評価用サンプルを作成した。これらの物性値を（表３）に示す。
[Comparative Example 2]
A propylene polymer (A) containing a transparent nucleating agent (2000 ppm of bis (methylbenzylidene) sorbitol (trade name: Gelol MD)) manufactured by Shin Nippon Chemical Co., Ltd. was injection molded under the same conditions as in Example 1 and evaluated. A sample was created. These physical property values are shown in (Table 3).
〔比較例３〕
実施例１のプロピレン重合体（Ｂ）であるＰＢＥＲをエチレン・１−ブテンランダム共重合体（ＥＢＲ）（三井化学株式会社製のタフマーＡ−４０８５Ｓ、（ＭＦＲ（１９０℃、２．１６ｋｇ荷重）＝３．６ｇ／１０ｍｉｎ、密度＝８８５ｋｇ／ｍ３）に置き換えた点以外は実施例１と同様の条件で評価用サンプルを作成した。これらの物性値を（表３）に示す。
[Comparative Example 3]
PBER which is the propylene polymer (B) of Example 1 was changed to ethylene / 1-butene random copolymer (EBR) (Tafmer A-4085S manufactured by Mitsui Chemicals, Inc. (MFR (190 ° C., 2.16 kg load)) = A sample for evaluation was prepared under the same conditions as in Example 1 except that it was replaced with 3.6 g / 10 min and density = 885 kg / m 3 ) These physical property values are shown in (Table 3).
（表３）の結果から、本発明の技術によって得られる成形品は、光学部品用途、より具体的には高い光線透過率と高いヘイズ（散乱光比率）を併せ持つことがわかる。これは本発明の光学部品をＬＥＤ光源のカバー等に適用したときに、高い照度を維持したまま効率的に光を散乱する性能を有することを意味し、樹脂自体の光学特性（光線透過率、散乱光比率）が高いレベルにあることは、この光学部品に各種光散乱剤を配合したものにおいても優れた光学特性の発現につながる。
また本発明の技術は、光学部品の材料である樹脂組成物ごとに配合する各種光散乱剤の添加量を抑制することも可能であり、製品のコストダウンや製造工程短縮にもつながる。
さらに、本発明の本発明の技術によって得られる成形品は、優れた耐衝撃性、靭性も併せ持つことも合わせて確認された。
なお、比較例２で示した成形品は、透明性向上のために透明核剤が配合されているが、光線透過率および散乱光比率ともに低下しており、本発明に関わる用途においては好ましくないと考えられる。
また、比較例３で示した成形品は、耐衝撃性改良のためにエチレン系エラストマーが配合されているが、光線透過率の低下が激しく、本発明に関わる用途においては好ましくないと考えられる。
From the results of (Table 3), it can be seen that the molded product obtained by the technique of the present invention has an optical component application, more specifically, a high light transmittance and a high haze (scattered light ratio). This means that when the optical component of the present invention is applied to an LED light source cover or the like, it has the ability to efficiently scatter light while maintaining high illuminance, and the optical properties of the resin itself (light transmittance, The fact that the ratio of the scattered light) is at a high level leads to the development of excellent optical properties even when various light scattering agents are blended with this optical component.
The technology of the present invention can also suppress the amount of various light scattering agents added to each resin composition that is a material for optical components, leading to cost reduction of products and shortening of manufacturing processes.
Furthermore, it was confirmed that the molded product obtained by the technique of the present invention has excellent impact resistance and toughness.
In addition, although the transparent nucleating agent is mix | blended for the transparency improvement for the molded article shown in the comparative example 2, both the light transmittance and the scattered light ratio are falling, and it is unpreferable in the use in connection with this invention. it is conceivable that.
Further, the molded product shown in Comparative Example 3 is blended with an ethylene-based elastomer for improving impact resistance, but the light transmittance is drastically decreased, and it is considered not preferable for the use related to the present invention.
本発明により、光学特性（光線透過率、散乱光比率）と耐衝撃性と耐傷付き性を併せ持つ光学部品が得られる。 According to the present invention, an optical component having both optical characteristics (light transmittance, scattered light ratio), impact resistance and scratch resistance can be obtained.
Claims (6)
（ｂ１）プロピレン由来の構成単位の含量が５１〜９９ｍｏｌ％
（ｂ２）密度が８４０〜８９０ｋｇ／ｍ３
（ｂ３）ガラス転移温度が−５０〜１０℃
A resin comprising a propylene polymer (A) having a melting point (Tm) of 110 to 175 ° C. and a propylene polymer (B) satisfying the following (b1) to (b3) and having a melting point (Tm) of less than 100 ° C. or not observed An optical component comprising the composition (X).
(B1) The content of structural units derived from propylene is 51 to 99 mol%.
(B2) Density is 840-890 kg / m 3
(B3) Glass transition temperature is −50 to 10 ° C.
Ｔｍ ＞ ３．７５ × ＸＣ３−２０５ ・・・ (I）
（ただし、式（Ｉ）において、Ｔｍは１４０℃以上である。）
The propylene polymer (A) and the propylene polymer (B) do not form a phase separation structure, and the melting point (Tm) (° C.) of the resin composition (X) 2. The optical component according to claim 1, wherein the content (X C3 ) (mol%) of the structural unit satisfies the following formula (I).
Tm> 3.75 × X C3 -205 (I)
(However, in the formula (I), Tm is 140 ° C. or higher.)
The propylene polymer (B) is a propylene-ethylene-α olefin copolymer (B-1) composed of propylene, ethylene and an α-olefin having 4 to 20 carbon atoms. The optical component according to any one of the above.
The optical component according to any one of claims 1 to 3, wherein the resin composition (X) contains 0.1 to 30% by weight of a light scattering agent.
To the resin composition (X), 50 to 99 parts by weight of the propylene polymer (A), 1 to 50 parts by weight of the propylene polymer (B) (however, the total of the propylene polymer (A) and the propylene polymer (B) The optical component according to claim 1, wherein the optical component is included in an amount of 100 parts by weight.
To the resin composition (X), 10 to 49 parts by weight of the propylene polymer (A), 90 to 51 parts by weight of the propylene polymer (B) (however, the total of the propylene polymer (A) and the propylene polymer (B) The optical component according to claim 1, wherein the optical component is included in an amount of 100 parts by weight.
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| JP2007321100A (en) * | 2006-01-20 | 2007-12-13 | Mitsui Chemicals Inc | Propylenic polymer composition, molded article comprising the composition, pellet comprising propylenic polymer composition, thermoplastic polymer modifier comprising the pellet, method for producing thermoplastic resin composition |
| WO2009050310A1 (en) * | 2007-10-19 | 2009-04-23 | Dow Global Technologies Inc. | Polyolefin based peelable seals |
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| JP2007321100A (en) * | 2006-01-20 | 2007-12-13 | Mitsui Chemicals Inc | Propylenic polymer composition, molded article comprising the composition, pellet comprising propylenic polymer composition, thermoplastic polymer modifier comprising the pellet, method for producing thermoplastic resin composition |
| WO2009050310A1 (en) * | 2007-10-19 | 2009-04-23 | Dow Global Technologies Inc. | Polyolefin based peelable seals |
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