JP2004285236A - Thermoplastic resin composition for air bag cover - Google Patents
Thermoplastic resin composition for air bag cover Download PDFInfo
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- JP2004285236A JP2004285236A JP2003079865A JP2003079865A JP2004285236A JP 2004285236 A JP2004285236 A JP 2004285236A JP 2003079865 A JP2003079865 A JP 2003079865A JP 2003079865 A JP2003079865 A JP 2003079865A JP 2004285236 A JP2004285236 A JP 2004285236A
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- ethylene
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- airbag cover
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- 239000011342 resin composition Substances 0.000 title claims description 18
- 229920005992 thermoplastic resin Polymers 0.000 title 1
- 239000000155 melt Substances 0.000 claims description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 14
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 14
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 abstract description 15
- 239000000203 mixture Substances 0.000 abstract description 4
- 229920002725 thermoplastic elastomer Polymers 0.000 abstract 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 18
- 239000005977 Ethylene Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 14
- 239000000178 monomer Substances 0.000 description 14
- 229920001577 copolymer Polymers 0.000 description 8
- -1 polypropylene Polymers 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-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
- 238000001746 injection moulding Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 229920005604 random copolymer Polymers 0.000 description 4
- 239000004711 α-olefin Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 238000012662 bulk polymerization Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 2
- 238000012685 gas phase polymerization Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 239000002685 polymerization catalyst Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 description 1
- LDTAOIUHUHHCMU-UHFFFAOYSA-N 3-methylpent-1-ene Chemical compound CCC(C)C=C LDTAOIUHUHHCMU-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000003931 anilides Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 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
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Air Bags (AREA)
- Instrument Panels (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、助手席用エアバッグカバーおよびピラー用エアバッグカバーに好適な剛性を有し、低温強度および成形性に優れるエアバッグカバー用樹脂組成物に関するものである。
【０００２】
【従来の技術】
自動車用エアバッグシステムのエアバッグカバーには、衝突の際、エアバッグが展開できるように確実に破裂しかつ破片が飛び散らないこと、寒冷地での使用にも耐える強度を有すること、成形性に優れることなどが求められている。かかるエアバッグカバーに用いられる材料としては、例えば、２３０℃のメルトフローレート（ＭＦＲ）が１４ｇ／１０分であるポリプロピレンと、１９０℃のＭＦＲが４ｇ／分、密度が９１５ｋｇ／ｃｍ３である線状低密度ポリエチレンとの樹脂組成物や、２３０℃のＭＦＲが３０ｇ／１０分、エチレン単位含量が３．１重量％であるプロピレン−エチレンランダム共重合体と、２３０℃のＭＦＲが５０ｇ／１０分であり密度が９２６ｋｇ／ｃｍ３である線状低密度ポリエチレンと、ムーニー粘度が８８のエチレン−プロピレン−非共役ジエン共重合体との樹脂組成物などからなり、１５０〜４００ＭＰａ程度の剛性を有する材料が提案されている（特許文献１、特許文献２参照。）。
【０００３】
【特許文献１】
特開平８−２７３３１
【特許文献２】
特開２００２−５３７１６
【０００４】
【発明が解決しようとする課題】
しかしながら、意匠性の観点から、助手席用エアバッグカバーを大型化し、インストルメントパネルの一部又は全体との兼用内装材とした場合、従来のエアバッグカバー用材料では、該兼用内装材が自重により変形することがあった。また、従来のピラー用エアバッグカバーは、人が押した時に変形することがあり、これまでのエアバッグカバー用材料は、剛性において十分満足のいくものではなかった。
かかる状況のもと、本発明が解決しようとする課題は、助手席用エアバッグカバーおよびピラー用エアバッグカバーに好適な剛性を有し、低温強度および成形性に優れるエアバッグカバー用樹脂組成物を提供することにある。
【０００５】
【課題を解決するための手段】
すなわち本発明は、下記成分（Ａ）および成分（Ｂ）を含有し、成分（Ａ）と成分（Ｂ）の合計量を１００重量％として、成分（Ａ）の含有量が１０〜９０重量％であり、成分（Ｂ）の含有量が９０〜１０重量％であるエアバッグカバー用樹脂組成物にかかるものである。
（Ａ）：密度が９４０〜９７５ｋｇ／ｍ３であり、温度２３０℃および荷重２１．１８Ｎの条件で測定されるメルトフローレートが０．０１〜５ｇ／１０分であるエチレン系重合体。
（Ｂ）：密度が９４０〜９７５ｋｇ／ｍ３であり、温度２３０℃および荷重２１．１８Ｎの条件で測定されるメルトフローレートが５ｇ／１０分を超え１００ｇ／１０分以下であるエチレン系重合体。
【０００６】
【発明の実施の形態】
本発明の成分（Ａ）および成分（Ｂ）のエチレン系重合体は、エチレンから誘導される単量体単位の含有量が５０重量％を超える重合体（但し、該重合体中の全単量体単位の含有量を１００重量％とする。）である。エチレン系重合体は、エチレン以外の単量体から誘導される単量体単位を含有していてもよく、エチレン以外の単量体としては、α−オレフィンなどがあげられ、該α−オレフィンとしては、プロピレン、１−ブテン、１−ペンテン、１−ヘキセン、１−オクテン、１−デセンなどの直鎖状α−オレフィン；３−メチル−１−ブテン、３−メチル−１−ペンテンなどの分岐状α−オレフィンなどが用いられる。α−オレフィンの中ではプロピレン、１−ブテン、１−ヘキセン、１−オクテンが好ましい。
【０００７】
成分（Ａ）および成分（Ｂ）のエチレン系重合体としては、エチレン単独重合体、エチレン−プロピレン共重合体、エチレン−１−ブテン共重合体、エチレン−１−ヘキセン共重合体、エチレン−１−オクテン共重合体、エチレン−プロピレン−１−ブテン共重合体、エチレン−１−ブテン−１−ヘキセン共重合体などをあげることができる。
【０００８】
成分（Ａ）のエチレン系重合体の密度は９４０〜９７５Ｋｇ／ｍ３であり、好ましくは９５０〜９７５Ｋｇ／ｍ３である。密度が過小であると剛性が低下し、エアバッグカバーが変形することがある。なお、該密度は、ＪＩＳ Ｋ７１１２に従い、アニール無しで測定される。
【０００９】
成分（Ａ）のエチレン系重合体のメルトフローレートは０．０１〜５ｇ／１０分であり、好ましくは０．０１〜０．５ｇ／１０分である。メルトフローレートが過小であると、流動性の低下や成形品の外観悪化により成形性が低下することがある。また、メルトフローレートが過大であると低温強度が低下することがある。なお、該メルトフローレートは、ＪＩＳ Ｋ７２１０に従い、温度２３０℃、荷重２１．１８Ｎの条件で測定される。
【００１０】
成分（Ｂ）のエチレン系重合体の密度は９４０〜９７５Ｋｇ／ｍ３であり、好ましくは９５０〜９７５Ｋｇ／ｍ３である。密度が過小であると剛性が低下し、エアバッグカバーが変形することがある。なお、該密度は、ＪＩＳ Ｋ７１１２に従い、アニール無しで測定される。
【００１１】
成分（Ｂ）のエチレン系重合体のメルトフローレートは５ｇ／１０分を超え、１００ｇ／１０分以下であり、好ましくは１０〜５０ｇ／１０分である。メルトフローレートが過小であると、流動性の低下や成形品の外観悪化により成形性が低下することがある。また、メルトフローレートが過大であると低温強度が低下することがある。なお、該メルトフローレートは、ＪＩＳ Ｋ７２１０に従い、温度２３０℃、荷重２１．１８Ｎの条件で測定される。
【００１２】
本発明の成分（Ａ）および成分（Ｂ）のエチレン系重合体の製造方法としては、公知のオレフィン重合用触媒を用いた公知の重合方法が用いられる。例えば、チーグラー・ナッタ系触媒、メタロセン系錯体や非メタロセン系錯体などの錯体系触媒を用いた、スラリー重合法、溶液重合法、塊状重合法、気相重合法等があげられる。また、市販の該当品を用いることも可能である。
【００１３】
本発明の樹脂組成物は、成分（Ａ）および成分（Ｂ）を含有し、成分（Ａ）の含有量が１０〜９０重量％であり、成分（Ｂ）の含有量が９０〜１０重量％であり、好ましくは成分（Ａ）の含有量が２０〜８０重量％であり、成分（Ｂ）の含有量が８０〜２０重量％であり、更に好ましくは成分（Ａ）の含有量が３０〜７０重量％であり、成分（Ｂ）の含有量が７０〜３０重量％である。ただし、成分（Ａ）と成分（Ｂ）の合計を１００重量％とする。成分（Ａ）が過少（成分（Ｂ）が過多）であると低温強度が低下することがあり、成分（Ａ）が過多（成分（Ｂ）が過少）であると、流動性の低下や成形品の外観悪化により成形性が低下することがある。
【００１４】
本発明の樹脂組成物は、必要に応じ、成分（Ａ）および（Ｂ）以外に、他の成分を含有していてもよいが、本発明の樹脂組成物において、該他の成分の含有量としては、成分（Ａ）および成分（Ｂ）の合計量１００重量部当たり、好ましくは６０重量部以下であり、より好ましくは５０重量部以下であり、更に好ましくは４０重量部以下である。
【００１５】
本発明の樹脂組成物は、耐熱性を高める観点から、下記成分（Ｃ）を含有することが好ましい。
（Ｃ）：プロピレン系樹脂
【００１６】
成分（Ｃ）のプロピレン系樹脂は、プロピレンから誘導される単量体単位の含有量が５０重量％を超える重合体（但し、該重合体中の全単量体単位の含有量を１００重量％とする。）であり、１００℃以上に融点を有するプロピレン系重合体である。成分（Ｃ）のプロピレン系樹脂としては、以下に示す（Ｃ１）〜（Ｃ３）の重合体などをあげることができ、これらは、２種以上組み合わせて用いてもよい。
（Ｃ１）：プロピレン単独重合体
（Ｃ２）：プロピレン−エチレンランダム共重合体
（Ｃ３）：下記要件▲１▼または▲２▼を充足するプロピレン−エチレンブロック共重合体
▲１▼：２つのセグメントからなり、１つのセグメント（以下、セグメント（Ｘ）と称する。）が、プロピレン単独重合体部またはプロピレン−エチレンランダム共重合体であり、もう１つのセグメント（以下、セグメント（Ｙ）と称する。）が、プロピレン−エチレンランダム共重合体であること
▲２▼：セグメント（Ｙ）のエチレン単量体単位含有量がセグメント（Ｘ）のエチレン単量体単位含有量よりも多いこと
なお、プロピレン系樹脂の融点は、ＪＩＳ Ｋ７１２１に従い、昇温速度および降温速度が５℃／ｍｉｎの条件で測定される。
【００１７】
（Ｃ２）としては、耐熱性を高める観点からエチレンから誘導される単量体単位の含有量が１０重量％以下（但し，該共重合体中の全単量体単位含有量を１００重量％とする。）が好ましい。また、（Ｃ３）としては、耐熱性を高める観点から、更に下記要件▲３▼を充足することが好ましく、更に下記要件▲４▼を充足することが好ましく、更に下記要件▲５▼を充足することが好ましい。
▲３▼：セグメント（Ｘ）のエチレン単量体単位の含有量が１０重量％以下（但し、セグメント（Ｘ）中の全単量体単位含有量を１００重量％とする。）であること
▲４▼：セグメント（Ｙ）のエチレン単量体単位の含有量は５０重量％以下（但し、セグメント（Ｙ）中の全単量体単位含有量を１００重量％とする。）であること
▲５▼：セグメント（Ｙ）の含有量は７０重量％以下（但し、該ブロック共重合体を１００重量％とする。）であること
【００１８】
成分（Ｃ）のプロピレン系樹脂のメルトフローレートは、成形体の外観を高める観点から、好ましくは０．１ｇ／１０分以上であり、より好ましくは１ｇ／１０分以上である。また、該メルトフローレートは、低温強度を高める観点から、好ましくは１５０ｇ／１０分以下であり、より好ましくは１００ｇ／１０分以下である。なお、該メルトフローレートは、ＪＩＳ Ｋ７２１０に従い、荷重２１．１８Ｎ、温度２３０℃の条件で測定される。
【００１９】
本発明の樹脂組成物において、成分（Ｃ）のプロピレン系樹脂の含有量は、耐熱性、低温強度を高める観点から、成分（Ａ）と成分（Ｂ）の合計量１００重量部あたり、好ましくは５〜５０重量部であり、より好ましくは１０〜４０重量部である。
【００２０】
本発明の成分（Ｃ）のプロピレン系樹脂の製造方法としては、公知のオレフィン重合用触媒を用いた公知の重合方法が用いられる。例えば、チーグラー・ナッタ系触媒、メタロセン系錯体や非メタロセン系錯体などの錯体系触媒を用いた、スラリー重合法、溶液重合法、塊状重合法、気相重合法等があげられる。また、市販の該当品を用いることも可能である。
【００２１】
本発明の樹脂組成物は、必要に応じ、無機フィラー（タルク、炭酸カルシウム、焼成カオリン等）、有機フィラー（繊維、木粉、セルロースパウダー等）、滑剤（脂肪酸アミド、シリコーンオイル、シリコーンガム等）、酸化防止剤（フェノール系、イオウ系、燐系、ラクトン系、ビタミン系等）、耐候安定剤、紫外線吸収剤（ベンゾトリアゾール系、トリアジン系、アニリド系、ベンゾフェノン系等）、熱安定剤、光安定剤（ヒンダードアミン系、ベンゾエート系等）、顔料、造核剤、吸着剤（金属酸化物（酸化亜鉛、酸化マグネシウム等）、金属塩化物（塩化鉄、塩化カルシウム等）、ハイドロタルサイト、アルミン酸塩等）等を含有してもよい。
【００２２】
本発明の樹脂組成物は、成分（Ａ）、成分（Ｂ）と必要に応じ配合される他の成分（成分（Ｃ）など）とを、公知の方法、例えば、二軸押出機、バンバリーミキサーなどにより溶融混練することで得ることができる。
【００２３】
本発明の樹脂組成物は、公知の成形加工方法、例えば射出成形法によりエアバッグカバーに成形される。本発明の樹脂組成物からなるエアバッグカバーは、特に、助手席用エアバッグカバーあるいはピラー用エアバッグカバーに好適に用いられる。助手席用エアバッグカバーとしては、インストルメントパネルとエアバッグカバーとの兼用内装材に用いる助手席用エアバッグカバーが好ましい。
【００２４】
【実施例】
以下、実施例によって、本発明をより詳細に説明する。
［Ｉ］ 物性測定方法
（１）密度
ＪＩＳ Ｋ７１１２に従い、アニール無しで測定を行った。
（２）メルトフローレート（ＭＦＲ）
ＪＩＳ Ｋ７２１０に従い、温度２３０℃、荷重２１．１８Ｎの条件で測定した。
（３）剛性
ＪＩＳ Ｋ７２０３に従い、曲げ弾性率を測定した。
（４）低温強度
ＪＩＳ Ｋ６９１１に従い、−４０℃でのＩｚｏｄ衝撃試験を行い、下記の通り評価した。
ＮＢ：破壊しなかった。
Ｂ ：破壊した。
（５）耐熱性
ＪＩＳ Ｋ７１９５に従い、１２０℃、２時間の条件でヒートサグを測定した。
【００２５】
［ＩＩ］ 原料
（１）エチレン系重合体
Ａ−１：ティコナ社製 Ｈｏｓｔａｌｌｏｙ７３１
（密度：９５１ｋｇ／ｍ３、ＭＦＲ：０．０６ｇ／１０分）
Ｂ−１：三井住友ポリオレフィン社製 Ｈｉ−ｚｅｘ １３００Ｊ
（密度：９６０ｋｇ／ｍ３、ＭＦＲ：２２ｇ／１０分）
（２）プロピレン系樹脂
Ｃ−１：三井住友ポリオレフィン社製 三井住友ポリプロ ＡＺ１６１Ｃ１
（ＭＦＲ：３２ｇ／１０分）
Ｃ−２：三井住友ポリオレフィン社製 三井住友ポリプロ Ｚ１４４Ａ
（ＭＦＲ：２５ｇ／１０分）
【００２６】
実施例１
エチレン系重合体（Ａ−１）７０重量部とエチレン系重合体（Ｂ−１）３０重量部とをタンブラーミキサーによりドライブレンドした後、二軸押出機で２００℃にて溶融混練し、次いで造粒し、ペレットにした。射出成形機を用いて、シリンダー温度２２０℃、金型温度５０℃の条件で、該ペレットを、厚さ２ｍｍ、１５０ｍｍ×９０ｍｍの平板に成形した。得られた平板の評価結果を表１に示す。
【００２７】
実施例２
エチレン系重合体（Ａ−１）を５０重量部、エチレン系重合体（Ｂ−１）を５０重量部とする以外は、実施例１と同様に行った。得られた平板の評価結果を表１に示す。
【００２８】
実施例３
エチレン系重合体（Ａ−１）７０重量部とエチレン系重合体（Ｂ−１）３０重量部とプロピレン系樹脂（Ｃ−１）２０重量部とをタンブラーミキサーによりドライブレンドした後、二軸押出機で２００℃にて溶融混練し、次いで造粒し、ペレットにした。射出成形機を用いて、シリンダー温度２２０℃、金型温度５０℃の条件で、該ペレットを、厚さ２ｍｍ、１５０ｍｍ×９０ｍｍの平板に成形した。得られた平板の評価結果を表１に示す。
【００２９】
実施例４
プロピレン系樹脂（Ｃ−１）に代えてプロピレン系樹脂（Ｃ−２）を用いる以外は、実施例３と同様に行った。得られた平板の評価結果を表１に示す。
【００３０】
比較例１
エチレン系重合体（Ｂ−１）のペレットを、射出成形機を用いて、シリンダー温度２２０℃、金型温度５０℃の条件で、厚さ２ｍｍ、１５０ｍｍ×９０ｍｍの平板に成形した。得られた平板の評価結果を表１に示す。
【００３１】
【表１】
【発明の効果】
以上説明したとおり、本発明により、助手席用エアバッグカバーおよびピラー用エアバッグカバーに好適な剛性を有し、低温強度および成形性に優れるエアバッグカバー用樹脂組成物を提供することができた。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resin composition for an airbag cover having rigidity suitable for an airbag cover for a passenger seat and an airbag cover for a pillar, and having excellent low-temperature strength and moldability.
[0002]
[Prior art]
The airbag cover of the airbag system for automobiles must have sufficient strength to withstand rupture and no shards to be able to deploy the airbag in the event of a collision, to have enough strength to withstand use in cold climates, and to have good moldability. It is required to be excellent. As a material used for such an airbag cover, for example, polypropylene having a melt flow rate (MFR) at 230 ° C. of 14 g / 10 min, and a wire having a MFR at 190 ° C. of 4 g / min and a density of 915 kg / cm 3 are used. A resin composition with a low-density polyethylene, a propylene-ethylene random copolymer having an MFR at 230 ° C. of 30 g / 10 min and an ethylene unit content of 3.1% by weight, and an MFR at 230 ° C. of 50 g / 10 min And a resin composition having a linear low-density polyethylene having a density of 926 kg / cm 3 and an ethylene-propylene-non-conjugated diene copolymer having a Mooney viscosity of 88, and having a rigidity of about 150 to 400 MPa. Has been proposed (see Patent Documents 1 and 2).
[0003]
[Patent Document 1]
JP-A-8-27331
[Patent Document 2]
JP-A-2002-53716
[0004]
[Problems to be solved by the invention]
However, from the viewpoint of design, when the passenger-side airbag cover is increased in size and used as an interior material for part or all of the instrument panel, the conventional interior material for the airbag cover has its own weight. Was sometimes deformed. Further, the conventional airbag cover for a pillar may be deformed when pressed by a person, and the material for the airbag cover up to now has not been sufficiently satisfactory in rigidity.
Under such circumstances, the problem to be solved by the present invention is to provide a resin composition for an airbag cover having rigidity suitable for a passenger airbag cover and a pillar airbag cover, and having excellent low-temperature strength and moldability. Is to provide.
[0005]
[Means for Solving the Problems]
That is, the present invention contains the following components (A) and (B), and when the total amount of the components (A) and (B) is 100% by weight, the content of the component (A) is 10 to 90% by weight. Wherein the content of component (B) is 90 to 10% by weight.
(A): An ethylene polymer having a density of 940 to 975 kg / m 3 and a melt flow rate of 0.01 to 5 g / 10 minutes measured at a temperature of 230 ° C. and a load of 21.18 N.
(B): an ethylene polymer having a density of 940 to 975 kg / m 3 and a melt flow rate measured at a temperature of 230 ° C. and a load of 21.18 N of more than 5 g / 10 min and not more than 100 g / 10 min. .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The ethylene polymer of the component (A) and the component (B) of the present invention is a polymer having a content of monomer units derived from ethylene of more than 50% by weight (however, The content of the body unit is 100% by weight.) The ethylene-based polymer may contain a monomer unit derived from a monomer other than ethylene, and examples of the monomer other than ethylene include an α-olefin and the like. Are linear α-olefins such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene and 1-decene; and branches such as 3-methyl-1-butene and 3-methyl-1-pentene. Α-olefins and the like are used. Among the α-olefins, propylene, 1-butene, 1-hexene and 1-octene are preferred.
[0007]
Examples of the ethylene polymer of the component (A) and the component (B) include an ethylene homopolymer, an ethylene-propylene copolymer, an ethylene-1-butene copolymer, an ethylene-1-hexene copolymer, and an ethylene-1 polymer. -Octene copolymer, ethylene-propylene-1-butene copolymer, ethylene-1-butene-1-hexene copolymer and the like.
[0008]
The density of the ethylene polymer of the component (A) is 940 to 975 Kg / m 3 , and preferably 950 to 975 Kg / m 3 . If the density is too low, the rigidity is reduced, and the airbag cover may be deformed. The density is measured without annealing according to JIS K7112.
[0009]
The melt flow rate of the ethylene polymer of the component (A) is 0.01 to 5 g / 10 minutes, and preferably 0.01 to 0.5 g / 10 minutes. If the melt flow rate is too low, moldability may decrease due to a decrease in fluidity or deterioration of the appearance of a molded product. If the melt flow rate is too high, the low-temperature strength may decrease. The melt flow rate is measured at a temperature of 230 ° C. and a load of 21.18 N according to JIS K7210.
[0010]
The density of the ethylene polymer of the component (B) is from 940 to 975 Kg / m 3 , preferably from 950 to 975 Kg / m 3 . If the density is too low, the rigidity is reduced, and the airbag cover may be deformed. The density is measured without annealing according to JIS K7112.
[0011]
The melt flow rate of the ethylene polymer of the component (B) is more than 5 g / 10 min and 100 g / 10 min or less, preferably 10 to 50 g / 10 min. If the melt flow rate is too low, moldability may decrease due to a decrease in fluidity or deterioration of the appearance of a molded product. If the melt flow rate is too high, the low-temperature strength may decrease. The melt flow rate is measured at a temperature of 230 ° C. and a load of 21.18 N according to JIS K7210.
[0012]
As a method for producing the ethylene polymer of the component (A) and the component (B) of the present invention, a known polymerization method using a known olefin polymerization catalyst is used. For example, a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization method, or the like using a complex catalyst such as a Ziegler-Natta catalyst, a metallocene complex, or a non-metallocene complex is exemplified. It is also possible to use commercially available products.
[0013]
The resin composition of the present invention contains component (A) and component (B), the content of component (A) is 10 to 90% by weight, and the content of component (B) is 90 to 10% by weight. Preferably, the content of the component (A) is 20 to 80% by weight, the content of the component (B) is 80 to 20% by weight, and more preferably, the content of the component (A) is 30 to 80% by weight. 70% by weight, and the content of the component (B) is 70 to 30% by weight. However, the sum of the components (A) and (B) is 100% by weight. If the amount of the component (A) is too small (the amount of the component (B) is too large), the low-temperature strength may decrease. The moldability may decrease due to the deterioration of the appearance of the product.
[0014]
The resin composition of the present invention may contain other components, if necessary, in addition to the components (A) and (B), but the content of the other components in the resin composition of the present invention. Is preferably not more than 60 parts by weight, more preferably not more than 50 parts by weight, and still more preferably not more than 40 parts by weight, per 100 parts by weight of the total amount of the components (A) and (B).
[0015]
The resin composition of the present invention preferably contains the following component (C) from the viewpoint of improving heat resistance.
(C): Propylene resin
The propylene resin of the component (C) is a polymer having a content of monomer units derived from propylene exceeding 50% by weight (provided that the content of all monomer units in the polymer is 100% by weight). And a propylene polymer having a melting point of 100 ° C. or higher. Examples of the propylene resin as the component (C) include the following polymers (C1) to (C3), and these may be used in combination of two or more.
(C1): Propylene homopolymer (C2): Propylene-ethylene random copolymer (C3): Propylene-ethylene block copolymer satisfying the following requirements (1) or (2): (1): From two segments One segment (hereinafter, referred to as segment (X)) is a propylene homopolymer portion or a propylene-ethylene random copolymer, and another segment (hereinafter, referred to as segment (Y)). Propylene-ethylene random copolymer {circle around (2)}: The ethylene monomer unit content of the segment (Y) is larger than the ethylene monomer unit content of the segment (X). The melting point is measured according to JIS K7121 at a rate of temperature rise and fall of 5 ° C./min.
[0017]
As (C2), from the viewpoint of improving heat resistance, the content of monomer units derived from ethylene is 10% by weight or less (provided that the total monomer unit content in the copolymer is 100% by weight. Is preferred). Further, from the viewpoint of enhancing heat resistance, (C3) preferably further satisfies the following requirement (3), more preferably satisfies the following requirement (4), and further satisfies the following requirement (5). Is preferred.
{Circle around (3)} The content of the ethylene monomer unit of the segment (X) is 10% by weight or less (provided that the total monomer unit content in the segment (X) is 100% by weight). 4: The content of the ethylene monomer unit in the segment (Y) is 50% by weight or less (provided that the content of all the monomer units in the segment (Y) is 100% by weight). ▼: The content of the segment (Y) is 70% by weight or less (provided that the block copolymer is 100% by weight).
The melt flow rate of the propylene-based resin of the component (C) is preferably 0.1 g / 10 min or more, more preferably 1 g / 10 min or more, from the viewpoint of enhancing the appearance of the molded article. Further, the melt flow rate is preferably 150 g / 10 minutes or less, more preferably 100 g / 10 minutes or less, from the viewpoint of increasing the low-temperature strength. The melt flow rate is measured under a load of 21.18 N and a temperature of 230 ° C. according to JIS K7210.
[0019]
In the resin composition of the present invention, the content of the propylene-based resin of the component (C) is preferably from 100 parts by weight of the total amount of the components (A) and (B) from the viewpoint of increasing heat resistance and low-temperature strength. It is 5 to 50 parts by weight, more preferably 10 to 40 parts by weight.
[0020]
As a method for producing the propylene resin of the component (C) of the present invention, a known polymerization method using a known olefin polymerization catalyst is used. For example, a slurry polymerization method, a solution polymerization method, a bulk polymerization method, a gas phase polymerization method, or the like using a complex catalyst such as a Ziegler-Natta catalyst, a metallocene complex, or a non-metallocene complex is exemplified. It is also possible to use commercially available products.
[0021]
The resin composition of the present invention may contain, if necessary, an inorganic filler (talc, calcium carbonate, calcined kaolin, etc.), an organic filler (fiber, wood powder, cellulose powder, etc.), a lubricant (fatty acid amide, silicone oil, silicone gum, etc.). , Antioxidants (phenol-based, sulfur-based, phosphorus-based, lactone-based, vitamin-based, etc.), weather stabilizers, ultraviolet absorbers (benzotriazole-based, triazine-based, anilide-based, benzophenone-based, etc.), heat stabilizers, light Stabilizer (hindered amine, benzoate, etc.), pigment, nucleating agent, adsorbent (metal oxide (zinc oxide, magnesium oxide, etc.), metal chloride (iron chloride, calcium chloride, etc.), hydrotalcite, aluminate And the like).
[0022]
The resin composition of the present invention can be prepared by mixing the components (A) and (B) with other components (component (C) and the like) blended as required by a known method, for example, a twin-screw extruder or a Banbury mixer. It can be obtained by melt-kneading such as.
[0023]
The resin composition of the present invention is formed into an airbag cover by a known molding method, for example, an injection molding method. The airbag cover made of the resin composition of the present invention is suitably used particularly for a passenger airbag cover or a pillar airbag cover. As the airbag cover for the passenger seat, an airbag cover for the passenger seat that is used as an interior material for both the instrument panel and the airbag cover is preferable.
[0024]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[I] Physical property measurement method (1) Density Measurement was performed without annealing according to JIS K7112.
(2) Melt flow rate (MFR)
According to JIS K7210, it was measured under the conditions of a temperature of 230 ° C. and a load of 21.18 N.
(3) Rigidity The flexural modulus was measured in accordance with JIS K7203.
(4) Low temperature strength An Izod impact test at −40 ° C. was performed according to JIS K6911, and evaluated as follows.
NB: did not break.
B: Destroyed.
(5) Heat resistance According to JIS K7195, heat sag was measured at 120 ° C. for 2 hours.
[0025]
[II] Raw material (1) Ethylene polymer A-1: Hostalloy731 manufactured by Ticona
(Density: 951 kg / m 3 , MFR: 0.06 g / 10 minutes)
B-1: Hi-zex 1300J manufactured by Sumitomo Mitsui Polyolefin Company
(Density: 960 kg / m 3 , MFR: 22 g / 10 min)
(2) Propylene resin C-1: Sumitomo Mitsui Polyolefin AZ161C1 manufactured by Sumitomo Mitsui Polyolefin Company
(MFR: 32 g / 10 minutes)
C-2: Sumitomo Mitsui Polyolefin Co., Ltd. Z144A
(MFR: 25 g / 10 minutes)
[0026]
Example 1
After dry-blending 70 parts by weight of the ethylene-based polymer (A-1) and 30 parts by weight of the ethylene-based polymer (B-1) by a tumbler mixer, the mixture is melt-kneaded at 200 ° C. by a twin-screw extruder, and then is manufactured. Granulated and pelletized. The pellets were formed into a flat plate having a thickness of 2 mm and a size of 150 mm × 90 mm using an injection molding machine under the conditions of a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C. Table 1 shows the evaluation results of the obtained flat plates.
[0027]
Example 2
The procedure was performed in the same manner as in Example 1 except that the ethylene-based polymer (A-1) was 50 parts by weight and the ethylene-based polymer (B-1) was 50 parts by weight. Table 1 shows the evaluation results of the obtained flat plates.
[0028]
Example 3
After dry-blending 70 parts by weight of the ethylene-based polymer (A-1), 30 parts by weight of the ethylene-based polymer (B-1) and 20 parts by weight of the propylene-based resin (C-1) using a tumbler mixer, twin-screw extrusion The mixture was melt-kneaded at 200 ° C. in a machine, then granulated and formed into pellets. The pellets were formed into a flat plate having a thickness of 2 mm and a size of 150 mm × 90 mm using an injection molding machine under the conditions of a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C. Table 1 shows the evaluation results of the obtained flat plates.
[0029]
Example 4
The procedure was performed in the same manner as in Example 3 except that the propylene resin (C-2) was used instead of the propylene resin (C-1). Table 1 shows the evaluation results of the obtained flat plates.
[0030]
Comparative Example 1
The pellets of the ethylene-based polymer (B-1) were formed into a flat plate having a thickness of 2 mm and a size of 150 mm × 90 mm using an injection molding machine under the conditions of a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C. Table 1 shows the evaluation results of the obtained flat plates.
[0031]
[Table 1]
【The invention's effect】
As described above, according to the present invention, a resin composition for an airbag cover having rigidity suitable for a passenger airbag cover and a pillar airbag cover and having excellent low-temperature strength and moldability can be provided. .
Claims (3)
（Ａ）：密度が９４０〜９７５ｋｇ／ｍ３であり、温度２３０℃および荷重２１．１８Ｎの条件で測定されるメルトフローレートが０．０１〜５ｇ／１０分であるエチレン系重合体。
（Ｂ）：密度が９４０〜９７５ｋｇ／ｍ３であり、温度２３０℃および荷重２１．１８Ｎの条件で測定されるメルトフローレートが５ｇ／１０分を超え１００ｇ／１０分以下であるエチレン系重合体。It contains the following components (A) and (B), and assuming that the total amount of the components (A) and (B) is 100% by weight, the content of the component (A) is 10 to 90% by weight. A resin composition for an airbag cover, wherein the content of B) is 90 to 10% by weight.
(A): An ethylene polymer having a density of 940 to 975 kg / m 3 and a melt flow rate of 0.01 to 5 g / 10 minutes measured at a temperature of 230 ° C. and a load of 21.18 N.
(B): an ethylene polymer having a density of 940 to 975 kg / m 3 and a melt flow rate measured at a temperature of 230 ° C. and a load of 21.18 N of more than 5 g / 10 min and not more than 100 g / 10 min. .
（Ｃ）：プロピレン系樹脂It contains the component (A), the component (B) and the following component (C), and the content of the component (C) is 5 to 50 parts by weight per 100 parts by weight of the total amount of the components (A) and (B). The resin composition for an airbag cover according to claim 1.
(C): Propylene resin
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| JP2003079865A JP4111024B2 (en) | 2003-03-24 | 2003-03-24 | Thermoplastic resin composition for airbag cover |
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| JP2003079865A JP4111024B2 (en) | 2003-03-24 | 2003-03-24 | Thermoplastic resin composition for airbag cover |
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| JP2004285236A true JP2004285236A (en) | 2004-10-14 |
| JP4111024B2 JP4111024B2 (en) | 2008-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008248090A (en) * | 2007-03-30 | 2008-10-16 | Sumitomo Chemical Co Ltd | Resin composition and filament |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008248090A (en) * | 2007-03-30 | 2008-10-16 | Sumitomo Chemical Co Ltd | Resin composition and filament |
| WO2008123593A1 (en) * | 2007-03-30 | 2008-10-16 | Sumitomo Chemical Company, Limited | Resin compositions and filaments |
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| Publication number | Publication date |
|---|---|
| JP4111024B2 (en) | 2008-07-02 |
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