JP2001279037A - Thermoplastic elastomer composition - Google Patents

Thermoplastic elastomer composition

Info

Publication number
JP2001279037A
JP2001279037A JP2000098715A JP2000098715A JP2001279037A JP 2001279037 A JP2001279037 A JP 2001279037A JP 2000098715 A JP2000098715 A JP 2000098715A JP 2000098715 A JP2000098715 A JP 2000098715A JP 2001279037 A JP2001279037 A JP 2001279037A
Authority
JP
Japan
Prior art keywords
ethylene
weight
elastomer composition
component
thermoplastic elastomer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2000098715A
Other languages
Japanese (ja)
Other versions
JP3731436B2 (en
Inventor
Eiji Nakaishi
英二 中石
Hiroshi Oyama
博 大山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Chemical Co Ltd
Original Assignee
Sumitomo Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP2000098715A priority Critical patent/JP3731436B2/en
Publication of JP2001279037A publication Critical patent/JP2001279037A/en
Application granted granted Critical
Publication of JP3731436B2 publication Critical patent/JP3731436B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition which has an excellent low temperature impact performance and excellent weld physical properties, in order to maintain an expanding performance at a high level, when processed into the air bag cover of an automobile. SOLUTION: This theruxoplastic elastomer composition comprising 30 to 65 wt.% of the following component (A), 5 to 20 wt.% of the component (B), and 30 to 50 wt.% of the component (C) in a (B)/(C) weight ratio of 0.1 to 0.6. The component (A): a propylenic resin; the component (B): ethylene- propylene copolymer rubber; and the component (C): an ethylene->=4C α-olefin copolymer rubber.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、熱可塑性エラスト
マー組成物に関するものである。更に詳しくは、本発明
は、低温衝撃性能、ウェルド物性に優れた熱可塑性エラ
ストマー組成物に関するものであり、自動車のエアバッ
グカバーとしたときに、その展開性能に優れる熱可塑性
エラストマー組成物に関するものである。
[0001] The present invention relates to a thermoplastic elastomer composition. More specifically, the present invention relates to a thermoplastic elastomer composition having excellent low-temperature impact performance and weld properties, and relates to a thermoplastic elastomer composition having excellent deployment performance when used as an automobile airbag cover. is there.

【0002】[0002]

【従来の技術】自動車のエアバッグカバーには、展開性
能に優れることが要求される。ここで、展開性能に優れ
るとは、エアバッグ作動時に、所定の箇所で確実にエア
バッグカバーが展開することである。そして、かかる要
求は、近年益々高水準になりつつある。そして、該高水
準の要求に照らすとき、現状のものは、必ずしも十分な
ものであるとは言い難い。
2. Description of the Related Art Airbag covers for automobiles are required to have excellent deployment performance. Here, "excellent in deployment performance" means that the airbag cover is reliably deployed at a predetermined location when the airbag is activated. And such demands are becoming increasingly higher in recent years. And, in light of this high level of demand, the current state of the art is not always satisfactory.

【0003】[0003]

【発明が解決しようとする課題】かかる現状において、
本発明が解決しようとする課題は、自動車のエアバッグ
カバーとしたときに、その展開性能を高水準にするた
め、低温衝撃性能及びウエルド物性に優れる熱可塑性エ
ラストマー組成物を提供する点に存する。
Under such circumstances,
The problem to be solved by the present invention is to provide a thermoplastic elastomer composition which is excellent in low-temperature impact performance and weld properties in order to achieve a high level of deployment performance when used as an airbag cover for an automobile.

【0004】[0004]

【課題を解決するための手段】すなわち、本発明は、下
記の成分(A)30〜65重量%、(B)5〜20重量
%及び(C)30〜50重量%を含有し、かつ(B)と
(C)の重量比((B)/(C))が0.1〜0.6で
ある熱可塑性エラストマー組成物に係るものである。 (A):プロピレン系樹脂 (B):エチレン−プロピレン共重合体ゴム (C):エチレン−炭素数4以上のαオレフィン共重合
体ゴム
That is, the present invention comprises 30 to 65% by weight of the following components (A), 5 to 20% by weight of (B) and 30 to 50% by weight of (C), and The present invention relates to a thermoplastic elastomer composition having a weight ratio ((B) / (C)) of B) to (C) of 0.1 to 0.6. (A): Propylene resin (B): Ethylene-propylene copolymer rubber (C): Ethylene-α-olefin copolymer rubber having 4 or more carbon atoms

【0005】[0005]

【発明の実施の形態】本発明の(A)は、プロピレン系
樹脂である。プロピレン系樹脂のメルトフローレイト
(230℃,21.18N)は0.1〜150g/10
minが好ましい。該メルトフローレイトが低すぎる
と、流動性が低くなり、成形性が悪く、外観が悪化する
こともある。一方、該メルトフローレイトが高すぎる
と、衝撃性能が悪化することもある。
BEST MODE FOR CARRYING OUT THE INVENTION (A) of the present invention is a propylene resin. Melt flow rate of propylene resin (230 ° C., 21.18 N) is 0.1 to 150 g / 10
min is preferred. If the melt flow rate is too low, the fluidity will be low, the moldability will be poor, and the appearance may be poor. On the other hand, if the melt flow rate is too high, impact performance may be deteriorated.

【0006】(A)としては、ホモポリプロピレン(A
1)、プロピレン−エチレンランダム共重合体(A
2)、プロピレン−エチレンブロック共重合体(A3)
等を用いることができる。また、(A1)、(A2),
(A3)の混合物でもよい。
As (A), homopolypropylene (A
1), propylene-ethylene random copolymer (A
2), propylene-ethylene block copolymer (A3)
Etc. can be used. (A1), (A2),
The mixture of (A3) may be used.

【0007】(A1)は、プロピレンの単独重合体であ
る。
(A1) is a homopolymer of propylene.

【0008】(A2)は、プロピレンとエチレンがラン
ダムに重合した共重合体である。
(A2) is a copolymer in which propylene and ethylene are randomly polymerized.

【0009】(A3)は、第一セグメント及び第二セグ
メントからなり、第一セグメントはプロピレン単独重合
のホモポリプロピレン部であり、第二セグメントはプロ
ピレン−エチレンランダム共重合体部であるブロック共
重合体である。第一セグメントとして第二セグメントと
エチレン含有量の異なるプロピレン−エチレンランダム
共重合体を用いてもよく、第二セグメントであるプロピ
レン−エチレンランダム共重合体部の含有量が30重量
%以上であるリアクターオレフィン系熱可塑性エラスト
マー(R−TPO)を用いてもよい。
(A3) comprises a first segment and a second segment, wherein the first segment is a homopropylene portion of propylene homopolymerization and the second segment is a block copolymer of a propylene-ethylene random copolymer portion. It is. A propylene-ethylene random copolymer having a different ethylene content from the second segment may be used as the first segment, and the content of the propylene-ethylene random copolymer portion as the second segment is 30% by weight or more. An olefin-based thermoplastic elastomer (R-TPO) may be used.

【0010】(A)はチーグラー系触媒、バナジウム系
触媒、メタロセン触媒のいずれの重合触媒を用いても製
造できる。
(A) can be produced using any polymerization catalyst such as a Ziegler catalyst, a vanadium catalyst, or a metallocene catalyst.

【0011】本発明の成分(B)は、エチレン−プロピ
レン共重合体ゴムである。
The component (B) of the present invention is an ethylene-propylene copolymer rubber.

【0012】(B)におけるエチレン/プロピレンの比
率(重量比)は、85/15〜45/55が好ましい。
エチレンが過少(プロピレンが過多)であると剛性が劣
る場合があり、一方エチレンが過多(プロピレンが過
少)であると衝撃強度が劣る場合がある。
The ratio (weight ratio) of ethylene / propylene in (B) is preferably from 85/15 to 45/55.
If the amount of ethylene is too small (the amount of propylene is too small), the rigidity may be poor. On the other hand, if the amount of ethylene is too small (the amount of propylene is too small), the impact strength may be poor.

【0013】(B)は、油展ゴムであってもよい。油展
ゴムを用いる場合の伸展油の含有量は、伸展油を除いた
ゴム100重量部あたり通常20〜200重量部であ
る。伸展油としては、鉱物系軟化剤、芳香族系軟化剤等
を用いることができる。
(B) may be oil-extended rubber. When oil extended rubber is used, the content of the extension oil is usually 20 to 200 parts by weight per 100 parts by weight of the rubber excluding the extension oil. As the extending oil, a mineral softener, an aromatic softener and the like can be used.

【0014】(B)は、100℃のムーニー粘度(ML
1+4 100℃)が10〜350のものが好ましく、更に
好ましくは30〜300である。該ムーニー粘度が過小
であると機械的強度に劣ることがあり、一方該ムーニー
粘度が過大であると成形品の外観が損なわれることがあ
る。
(B) is a Mooney viscosity (ML) at 100 ° C.
(1 + 4 100 ° C.) is preferably from 10 to 350, more preferably from 30 to 300. If the Mooney viscosity is too low, the mechanical strength may be poor, while if the Mooney viscosity is too high, the appearance of the molded article may be impaired.

【0015】(B)はチーグラー系触媒、バナジウム系
触媒、メタロセン触媒のいずれの重合触媒を用いても製
造することができる。
(B) can be produced using any polymerization catalyst such as a Ziegler catalyst, a vanadium catalyst or a metallocene catalyst.

【0016】本発明の成分(C)は、エチレン−炭素数
4以上のα−オレフィン共重合体ゴムである。α−オレ
フィンとしては1−ブテン、1−ヘキセン、1−オクテ
ンが好ましい。
The component (C) of the present invention is an α-olefin copolymer rubber having 4 or more ethylene-carbon atoms. As the α-olefin, 1-butene, 1-hexene and 1-octene are preferred.

【0017】(C)におけるエチレン/α−オレフィン
の比率(重量比)は、90/10〜50/50が好まし
い。エチレンが過少(α−オレフィンが過多)であると
剛性、耐熱性が劣る場合があり、一方エチレンが過多
(α−オレフィンが過少)であると衝撃強度が劣る場合
がある。
The ratio (weight ratio) of ethylene / α-olefin in (C) is preferably 90/10 to 50/50. If the amount of ethylene is too small (the amount of α-olefin is too large), the rigidity and heat resistance may be poor. On the other hand, if the amount of ethylene is too small (the amount of α-olefin is too small), the impact strength may be poor.

【0018】(C)は、100℃のムーニー粘度(ML
1+4100℃)が10〜350のものが好ましく、更に
好ましくは30〜300である。該ムーニー粘度が過少
であると機械的強度に劣ることがあり、一方該ムーニー
粘度が過大であると成形品の外観が損なわれることがあ
る。
(C) is a Mooney viscosity (ML) at 100 ° C.
(1 + 4 100 ° C.) is preferably from 10 to 350, more preferably from 30 to 300. If the Mooney viscosity is too low, the mechanical strength may be poor, while if the Mooney viscosity is too high, the appearance of the molded article may be impaired.

【0019】(C)はチーグラー系触媒、バナジウム系
触媒、メタロセン触媒のいずれの重合触媒を用いても製
造することができる。
(C) can be produced using any polymerization catalyst such as a Ziegler catalyst, a vanadium catalyst or a metallocene catalyst.

【0020】本発明の熱可塑性エラストマー組成物にお
ける各成分の割合は、(A)30〜65重量%、(B)
5〜20重量%及び(C)30〜50重量%であり、か
つ(B)と(C)の重量比((B)/(C))が0.1
〜0.6である。好ましくは(A)35〜60重量%、
(B)10〜20重量%及び(C)30〜45重量%で
あり、かつ(B)と(C)の重量比((B)/(C))
が0.2〜0.5である。ただし、(A)〜(C)の合
計量を100重量%とする。(A)が過少であると剛
性、耐熱性に劣り、一方(A)が過多であると衝撃強度
が劣る。(B)が過少であると衝撃強度に劣り、一方
(B)が過多であると剛性、耐熱性が劣る。(C)が過
少であるとウェルド物性が劣り、一方(C)が過多であ
ると剛性、耐熱性が劣る。(B)/(C)の重量比が過
小であると衝撃強度に劣り、一方該比が過大であるとウ
ェルド物性が劣る。
The proportion of each component in the thermoplastic elastomer composition of the present invention is (A) 30 to 65% by weight, (B)
5 to 20% by weight and (C) 30 to 50% by weight, and the weight ratio ((B) / (C)) between (B) and (C) is 0.1.
0.60.6. Preferably (A) 35 to 60% by weight,
(B) 10 to 20% by weight and (C) 30 to 45% by weight, and the weight ratio of (B) to (C) ((B) / (C))
Is 0.2 to 0.5. However, the total amount of (A) to (C) is 100% by weight. If (A) is too small, rigidity and heat resistance are poor, while if (A) is too large, impact strength is poor. If (B) is too small, the impact strength is poor, while if (B) is too large, the rigidity and heat resistance are poor. When the amount of (C) is too small, the properties of the weld are inferior. On the other hand, when the amount of (C) is too much, the rigidity and heat resistance are inferior. If the weight ratio of (B) / (C) is too small, the impact strength will be poor, while if the ratio is too large, the weld properties will be poor.

【0021】本発明の熱可塑性エラストマー組成物は、
(D)平均粒径が4μm以下であるタルクを、(A)〜
(B)の合計量100重量部あたり3〜15重量部含有
することが好ましい。このことにより剛性を向上するこ
とができる。(D)が過少であると剛性が劣る場合があ
り、一方(D)が過多であると衝撃強度が劣る。(D)
の平均粒径が過大であると衝撃強度が劣り、外観が悪化
する。
The thermoplastic elastomer composition of the present invention comprises:
(D) talc having an average particle size of 4 μm or less,
It is preferable to contain 3 to 15 parts by weight per 100 parts by weight of the total amount of (B). Thereby, rigidity can be improved. If (D) is too small, the rigidity may be poor, while if (D) is too large, the impact strength may be poor. (D)
Is too large, the impact strength is inferior and the appearance is deteriorated.

【0022】本発明の熱可塑性エラストマー組成物は、
他成分として、酸化防止剤、紫外線吸収剤、帯電防止
剤、難燃剤、滑剤、顔料、銅害防止剤、中和剤、造核剤
等の添加剤を含有してもよい。
The thermoplastic elastomer composition of the present invention comprises:
As other components, additives such as antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, lubricants, pigments, copper damage inhibitors, neutralizing agents, nucleating agents and the like may be contained.

【0023】本発明の熱可塑性エラストマー組成物を得
るには、たとえば二軸押出機、バンバリーミキサーなど
により、各成分を溶融混練すればよい。
In order to obtain the thermoplastic elastomer composition of the present invention, the respective components may be melt-kneaded using, for example, a twin-screw extruder or a Banbury mixer.

【0024】本発明の熱可塑性エラストマー組成物は、
自動車のエアバッグカバーとしたときに、その展開性能
に優れるものであるが、該用途の他に、たとえばコンソ
ールボックル、シフトレバー、ドアトリム等の二色成形
品、インストルパネル、ドア、グラスラン等の表皮材等
にも使用できる。
The thermoplastic elastomer composition of the present invention comprises:
When it is used as an airbag cover for an automobile, it is excellent in its deployment performance. In addition to this application, for example, two-color molded articles such as console bockles, shift levers, door trims, and the skins of instrument panels, doors, glass runs, etc. It can also be used for materials.

【0025】[0025]

【実施例】以下の実施例によって、本発明をより詳細に
説明する。 〔I〕原料 (A)プロピレン系樹脂 A−1;MFR(230℃,21.18N)=30g/
10minであるプロピレン−エチレンブロック共重合
体(BLOCK-PP) (B)エチレン−プロピレン共重合体ゴム B−1;ML1+4100℃=52、プロピレン含量=2
7wt%であるエチレン−プロピレン共重合体ゴム(E
PR) (C)エチレン−炭素数4以上のα−オレフィン共重合
体ゴム C−1;ML1+4100℃=66であるエチレン−1−
ブテン共重合体ゴム(EBR) (D)タルク D−1;平均粒径=2.1μmであるタルク
The following examples illustrate the invention in more detail. [I] Raw material (A) Propylene resin A-1; MFR (230 ° C., 21.18 N) = 30 g /
Propylene-ethylene block copolymer (BLOCK-PP) for 10 min (B) Ethylene-propylene copolymer rubber B-1; ML 1 + 4 100 ° C. = 52, propylene content = 2
7% by weight of ethylene-propylene copolymer rubber (E
PR) (C) ethylene-α-olefin copolymer rubber having 4 or more carbon atoms C-1; ML 1 + 4 ethylene-1- having 100 ° C. = 66
Butene copolymer rubber (EBR) (D) Talc D-1; Talc having an average particle size of 2.1 μm

【0026】〔II〕製造方法 ペレット形状の上記原料をタンブラー用いてドライブレ
ンドを行った後、180〜200℃に設定された二軸押
出機を用いて溶融混練を行った。
[II] Manufacturing Method After the pellet-shaped raw material was dry-blended using a tumbler, melt kneading was performed using a twin-screw extruder set at 180 to 200 ° C.

【0027】〔III〕測定方法 得られた組成物についてはシリンダー温度220℃、金
型温度50℃にて射出成形機を用いて厚さ2mm、15
0mm×90mmの平板を成形した後、必要な形状に打
ち抜き測定を行った。 (1)曲げ弾性率:JIS K7203に準じた測定し
た。 (2)Izod衝撃試験:JIS K6911に準じた
測定した。 (3)ウェルド部引張試験:対向2点ゲートの金型を用
い射出成形にて、中央部に対向ウェルドができる平板を
作製した。その平板より打ち抜きダンベルにて標線間の
中央にウェルドラインがくるようにJIS3号引張試験
片を打ち抜き作製した。その引張試験片をJIS K63
01(3号ダンベルを用い、引張速度200mm/mi
n)にて試験を行った。
[III] Measuring Method The obtained composition was prepared at a cylinder temperature of 220.degree. C. and a mold temperature of 50.degree.
After forming a flat plate of 0 mm × 90 mm, punching measurement was performed to a required shape. (1) Flexural modulus: Measured according to JIS K7203. (2) Izod impact test: Measured according to JIS K6911. (3) Weld portion tensile test: A flat plate having a counter weld at the center was prepared by injection molding using a mold having two gates facing each other. A JIS No. 3 tensile test piece was punched out from the flat plate with a dumbbell so that a weld line was at the center between the marked lines. JIS K63
01 (using a No. 3 dumbbell, pulling speed 200 mm / mi
The test was performed in n).

【0028】[0028]

【表1】 [Table 1]

【0029】[0029]

【発明の効果】以上説明したとおり、本発明により、自
動車のエアバッグカバーとしたときに、その展開性能を
高水準にするため、低温衝撃性能及びウエルド物性に優
れる熱可塑性エラストマー組成物を提供することができ
た。
As described above, according to the present invention, there is provided a thermoplastic elastomer composition which is excellent in low-temperature impact performance and weld physical properties in order to achieve a high level of deployment performance when used as an airbag cover for an automobile. I was able to.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 下記の成分(A)30〜65重量%、
(B)5〜20重量%及び(C)30〜50重量%を含
有し、かつ(B)と(C)の重量比((B)/(C))
が0.1〜0.6である熱可塑性エラストマー組成物。 (A):プロピレン系樹脂 (B):エチレン−プロピレン共重合体ゴム (C):エチレン−炭素数4以上のα−オレフィン共重
合体ゴム
1. The following component (A): 30 to 65% by weight,
(B) 5 to 20% by weight and (C) 30 to 50% by weight, and the weight ratio of (B) to (C) ((B) / (C))
Is a thermoplastic elastomer composition of 0.1 to 0.6. (A): Propylene resin (B): Ethylene-propylene copolymer rubber (C): Ethylene-α-olefin copolymer rubber having 4 or more carbon atoms
【請求項2】 請求項1記載の(A)〜(C)の合計量
100重量部あたり、下記成分(D)3〜15重量部を
含有する請求項1記載の熱可塑性エラストマー組成物。 (D):平均粒径が4μm以下であるタルク
2. The thermoplastic elastomer composition according to claim 1, which contains 3 to 15 parts by weight of the following component (D) per 100 parts by weight of the total amount of (A) to (C) described in claim 1. (D): talc having an average particle size of 4 μm or less
JP2000098715A 2000-03-31 2000-03-31 Thermoplastic elastomer composition Expired - Fee Related JP3731436B2 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publications (2)

Publication Number Publication Date
JP2001279037A true JP2001279037A (en) 2001-10-10
JP3731436B2 JP3731436B2 (en) 2006-01-05

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Country Status (1)

Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007254690A (en) * 2006-03-27 2007-10-04 Sumitomo Chemical Co Ltd Thermoplastic elastomer composition for air bag cover
JP2008045037A (en) * 2006-08-17 2008-02-28 Sumitomo Chemical Co Ltd Air bag cover form
JP2008045038A (en) * 2006-08-17 2008-02-28 Sumitomo Chemical Co Ltd Air bag cover form
WO2009011448A1 (en) * 2007-07-18 2009-01-22 Sumitomo Chemical Company, Limited Thermoplastic elastomer composition and composite molded body
JP2013035888A (en) * 2011-08-03 2013-02-21 Mitsubishi Chemicals Corp Thermoplastic elastomer composition and air bag housing cover

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JP5049211B2 (en) 2008-07-03 2012-10-17 タカタ株式会社 Airbag cover and airbag device

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Publication number Priority date Publication date Assignee Title
JP2007254690A (en) * 2006-03-27 2007-10-04 Sumitomo Chemical Co Ltd Thermoplastic elastomer composition for air bag cover
JP2008045037A (en) * 2006-08-17 2008-02-28 Sumitomo Chemical Co Ltd Air bag cover form
JP2008045038A (en) * 2006-08-17 2008-02-28 Sumitomo Chemical Co Ltd Air bag cover form
WO2009011448A1 (en) * 2007-07-18 2009-01-22 Sumitomo Chemical Company, Limited Thermoplastic elastomer composition and composite molded body
US9694522B2 (en) 2007-07-18 2017-07-04 Sumitomo Chemical Company, Limited Thermoplastic elastomer composition and composite molded body
JP2013035888A (en) * 2011-08-03 2013-02-21 Mitsubishi Chemicals Corp Thermoplastic elastomer composition and air bag housing cover

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