JPWO2019103078A1 - 樹脂組成物、溶融成形用材料、多層構造体および液体包装用材料 - Google Patents
樹脂組成物、溶融成形用材料、多層構造体および液体包装用材料 Download PDFInfo
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- JPWO2019103078A1 JPWO2019103078A1 JP2018562130A JP2018562130A JPWO2019103078A1 JP WO2019103078 A1 JPWO2019103078 A1 JP WO2019103078A1 JP 2018562130 A JP2018562130 A JP 2018562130A JP 2018562130 A JP2018562130 A JP 2018562130A JP WO2019103078 A1 JPWO2019103078 A1 JP WO2019103078A1
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- resin
- resin composition
- polyester
- evoh
- sorbic acid
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Abstract
Description
本発明の樹脂組成物は、EVOH(A)、ポリエステル系樹脂(B)およびソルビン酸エステル(C)を含有する。以下、本発明の樹脂組成物の各成分について順に説明する。
本発明で用いるEVOH(A)は、通常、エチレンとビニルエステル系モノマーとを共重合させた後にケン化させることにより得られる樹脂であり、一般的にエチレン−ビニルアルコール系共重合体やエチレン−ビニルエステル系共重合体ケン化物と称される非水溶性の熱可塑性樹脂である。重合法も公知の任意の重合法、例えば、溶液重合、懸濁重合、エマルジョン重合を用いることができるが、一般的にはメタノールを溶媒とする溶液重合が用いられる。得られたエチレン−ビニルエステル系共重合体のケン化も公知の方法で行い得る。
すなわち、本発明で用いるEVOH(A)は、エチレン構造単位とビニルアルコール構造単位を主とし、通常、ケン化されずに残存した若干量のビニルエステル構造単位を含むものである。
上記コモノマーとしては、例えば、プロピレン、1−ブテン、イソブテン等のオレフィン類や、2−プロペン−1−オール、3−ブテン−1−オール、4−ペンテン−1−オール、5−ヘキセン−1−オール、3,4−ジヒドロキシ−1−ブテン、5−ヘキセン−1,2−ジオール等の水酸基含有α−オレフィン類や、そのエステル化物である、3,4−ジアシロキシ−1−ブテン、3,4−ジアセトキシ−1−ブテン、2,3−ジアセトキシ−1−アリルオキシプロパン、2−アセトキシ−1−アリルオキシ−3−ヒドロキシプロパン、3−アセトキシ−1−アリルオキシ−2−ヒドロキシプロパン、グリセリンモノビニルエーテル、グリセリンモノイソプロペニルエーテル等、水酸基含有α−オレフィン類のアシル化物等の誘導体、1,3−ヒドロキシ−2−メチレンプロパン、1,5−ヒドロキシ−3−メチレンペンタン等のヒドロキシメチルビニリデン類;これらのエステル化物である1,3−ジアセトキシ−2−メチレンプロパン、1,3−ジプロピオニルオキシ−2−メチレンプロパン、1,3−ジブチロニルオキシ−2−メチレンプロパン等のビニリデンジアセテート類;アクリル酸、メタクリル酸、クロトン酸、(無水)フタル酸、(無水)マレイン酸、(無水)イタコン酸等の不飽和酸類あるいはその塩あるいは炭素数1〜18のモノまたはジアルキルエステル類、アクリルアミド、炭素数1〜18のN−アルキルアクリルアミド、N,N−ジメチルアクリルアミド、2−アクリルアミドプロパンスルホン酸あるいはその塩、アクリルアミドプロピルジメチルアミンあるいはその酸塩あるいはその4級塩等のアクリルアミド類、メタアクリルアミド、炭素数1〜18のN−アルキルメタクリルアミド、N,N−ジメチルメタクリルアミド、2−メタクリルアミドプロパンスルホン酸あるいはその塩、メタクリルアミドプロピルジメチルアミンあるいはその酸塩あるいはその4級塩等のメタクリルアミド類、N−ビニルピロリドン、N−ビニルホルムアミド、N−ビニルアセトアミド等のN−ビニルアミド類、アクリルニトリル、メタクリルニトリル等のシアン化ビニル類、炭素数1〜18のアルキルビニルエーテル、ヒドロキシアルキルビニルエーテル、アルコキシアルキルビニルエーテル等のビニルエーテル類、塩化ビニル、塩化ビニリデン、フッ化ビニル、フッ化ビニリデン、臭化ビニル等のハロゲン化ビニル化合物類、トリメトキシビニルシラン等のビニルシラン類、酢酸アリル、塩化アリル等のハロゲン化アリル化合物類、アリルアルコール、ジメトキシアリルアルコール等のアリルアルコール類、トリメチル−(3−アクリルアミド−3−ジメチルプロピル)−アンモニウムクロリド、アクリルアミド−2−メチルプロパンスルホン酸等のコモノマーがあげられる。これらは単独でもしくは2種以上併せて用いることができる。
本発明で用いられる、ポリエステル系樹脂(B)は、公知のポリエステル系樹脂を用いることができる。EVOH(A)の改質効果に優れる点で好ましくはポリエステル系熱可塑性エラストマーであり、かかるポリエステル系熱可塑性エラストマーとは、通常、ハードセグメントと、ソフトセグメントのポリマーブロックとを有するポリエステル系樹脂であり、一般にポリエステル系熱可塑性エラストマーとして知られているものを用いることができる。
また、ポリエステル系樹脂(B)のMFR(230℃、荷重2160g)は、通常1〜100g/10分、好ましくは10〜80g/10分、特に好ましくは20〜50g/10分である。MFRが上記範囲内である場合、本発明の効果がより効果的に得られる傾向がある。
また、ポリエステル系樹脂(B)としては、ポリアルキレンエーテルユニットを有するブロック共重合体も用いることができる。ブロック共重合体としては、芳香族ポリエステルとポリアルキレンエーテルを用いたポリエステルエーテルブロック共重合体、脂肪族ポリエステルとポリアルキレンエーテルを用いたブロック共重合体等があげられる。
本発明は、EVOH(A)およびポリエステル系樹脂(B)を含有する樹脂組成物において、ソルビン酸エステル(C)を特定微量にて配合することにより、熱安定性に優れ、かつ着色を抑制するという顕著な効果を奏するものである。
このようにして、常にラジカルを捕捉可能なソルビン酸が生成することから、樹脂組成物において、ラジカルの発生した早い段階でラジカルを捕捉することが可能となり、優れた着色抑制効果が得られると推測される。本発明においては、ソルビン酸エステル(C)の配合量が特定微量である場合、上記のサイクルが効率よく働き、顕著な耐熱劣化性および着色抑制効果が得られるものと推測される。
本発明の樹脂組成物においては、分散助剤として炭化水素系樹脂(D)をさらに配合することが好ましい。本発明において、上記炭化水素系樹脂(D)とは、数平均分子量が通常100〜3000で、かつ軟化点が通常60℃以上170℃未満の樹脂である。このような炭化水素系樹脂(D)は、通常、常温(23℃)で液体または固体の熱可塑性樹脂に属する。
なかでも上記の芳香族系石油樹脂、または脂肪族/芳香族系石油樹脂を水素添加して得られた水添系石油樹脂が代表的であり、具体例としては、アルコン(荒川化学工業社製)、アイマーブ(出光興産社製)、エスコレッツ5000シリーズ(エクソンモービル社製)等があげられる。
かかる水添系石油樹脂の場合には、水添率によって樹脂の極性が異なり、主に水添率90%以上の完全水添型と水添率90%未満の部分水添型に2種類に分類される。前者の具体例としては、アルコンPグレード(荒川化学工業社製)、アイマーブPタイプ(出光興産社製)等があげられ、後者の具体例としては、アルコンMグレード(荒川化学工業社製)、アイマーブSタイプ(出光興産社製)等があげられる。
また、水添系石油樹脂の水添率については、特に限定されないが、比較的極性が低い未変性ポリエステル系樹脂(B1)を用いた場合の親和性を考慮すると、完全水添型の水添系石油樹脂を用いることが好ましい。
本発明の樹脂組成物には、EVOH(A)、ポリエステル系樹脂(B)および炭化水素系樹脂(D)以外に、さらに樹脂成分として、他の熱可塑性樹脂を、樹脂組成物に対して、通常10重量%以下、好ましくは5重量%以下、特に好ましくは3重量%以下となるような範囲内で含有してもよい。
本発明の樹脂組成物には、上記各成分の他、必要に応じて、本発明の効果を損なわない範囲内(例えば、通常樹脂組成物全体の10重量%以下、好ましくは5重量%以下、特に好ましくは3重量%以下の含有割合)において、エチレングリコール、グリセリン、ヘキサンジオール等の脂肪族多価アルコール等の可塑剤;高級脂肪酸(例えばラウリン酸、ミリスチン酸、パルミチン酸、ステアリン酸、ベヘニン酸、オレイン酸等)、高級脂肪酸の金属塩(例えばステアリン酸カルシウム、ステアリン酸マグネシウム等)、高級脂肪酸エステル(高級脂肪酸のメチルエステル、イソプロピルエステル、ブチルエステル、オクチルエステル等)、高級脂肪族アミド(例えばステアリン酸アミド等、オレイン酸アミド等)、ビス高級脂肪酸アミド(例えばエチレンビスステアリン酸アミド等)、低分子量ポリオレフィン(例えば、分子量500〜10000程度の低分子量ポリエチレン、または低分子量ポリプロピレン)等の滑剤;乾燥剤;酸素吸収剤;熱安定剤;光安定剤;難燃剤;架橋剤;硬化剤;発泡剤;結晶核剤;防曇剤;生分解用添加剤;シランカップリング剤;アンチブロッキング剤;酸化防止剤;着色剤;帯電防止剤;紫外線吸収剤;抗菌剤;不溶性無機複塩(例えば、ハイドロタルサイト等);界面活性剤;ワックス等の公知の添加剤を適宜配合することができる。これらは単独でもしくは2種以上併せて用いることができる。
これらのうち、特に、酢酸、ホウ酸およびその塩を含むホウ素化合物、酢酸塩、リン酸塩を配合することが好ましい。
本発明の樹脂組成物は、前記必須成分であるEVOH(A)、ポリエステル系樹脂(B)およびソルビン酸エステル(C)と、必要に応じて、炭化水素系樹脂(D)および、上記の各任意成分を用いて製造されるが、製造方法としては、例えば、ドライブレンド法、溶融混合法、溶液混合法、含浸法等の公知の方法があげられ、これらを任意に組み合わせることも可能である。
室温(25℃)下において、樹脂組成物の乾燥前重量(W1)を電子天秤にて秤量し、その後、この試料を150℃の熱風乾燥機中で5時間乾燥させる。乾燥後、デシケーター中で30分間放冷して樹脂組成物の温度を室温(25℃)に戻した後の重量(W2)を秤量し、下記式より算出する。
含水率(重量%)=[(W1−W2)/W1]×100
本発明の多層構造体は、上記本発明の樹脂組成物からなる層を備えるものである。本発明の樹脂組成物からなる層(以下、「樹脂組成物層」と称する。)は、本発明の樹脂組成物以外の熱可塑性樹脂を主成分とする他の基材(以下、「基材樹脂」と称する。)と積層することで、さらに強度を付与したり、樹脂組成物層を水分等の影響から保護したり、他の機能を付与することができる。
なお、例中「部」、「%」とあるのは、断りのない限り重量基準を意味する。
・EVOH(A):エチレン構造単位の含有量29モル%、ケン化度100モル%、MFR3.2g/10分(210℃、荷重2160g)のエチレン−ビニルアルコール共重合体
・ポリエステル系樹脂(B):ポリアルキレンエーテルユニットを含有するポリエステル系熱可塑性エラストマー「プリマロイ AP GQ430」三菱化学社製、融点165℃、MFR35g/10分(230℃、荷重2160g)
上記EVOH(A)のペレット80部、上記ポリエステル系樹脂(B)のペレット20部をドライブレンドした。その後ドライブレンドしたペレット100部、ソルビン酸エステル(C)としてソルビン酸メチル(和光純薬工業社製、分子量126)0.0000004部(樹脂組成物の重量当たり0.004ppm)をプラストグラフ(ブラベンダー社製)にて、230℃で5分間予熱したのち、230℃、50rpmの条件下において5分間溶融混練し、その後冷却固化させ、塊状の樹脂組成物を得た。
得られた樹脂組成物を、粉砕機(ソメタニ産業社製、型式:SKR16−240)を用い、回転刃の回転数650rpmにて粉砕して粉砕物を得た。かかる粉砕物は、1mm角から5mm角の小片であった。かかる樹脂組成物の含水率は、0.19%であった。
実施例1において、ソルビン酸メチルの配合量を0.00008部(樹脂組成物の重量当たり0.8ppm)に変更した以外は、実施例1と同様にして実施例2の樹脂組成物およびその粉砕物を得た。かかる樹脂組成物の含水率は、0.17%であった。
実施例1において、ソルビン酸メチルをソルビン酸エチル(和光純薬工業社製、分子量140)に変更した以外は、実施例1と同様にして実施例3の樹脂組成物およびその粉砕物を得た。かかる樹脂組成物の含水率は、0.16%であった。
実施例1において、ソルビン酸メチルを配合しなかった以外は実施例1と同様にして比較例1の樹脂組成物およびその粉砕物を得た。かかる樹脂組成物の含水率は、0.16%であった。
実施例1において、ソルビン酸メチルの配合量を0.0012部(樹脂組成物の重量当たり12ppm)に変更した以外は、実施例1と同様にして比較例2の樹脂組成物およびその粉砕物を得た。かかる樹脂組成物の含水率は、0.16%であった。
実施例1において、ポリエステル系樹脂(B)およびソルビン酸エステル(C)を配合せず、EVOH(A)のみを用いた以外は実施例1と同様に溶融混練し、粉砕して、比較例3の粉砕物を得た。かかるEVOH(A)の含水率は、0.11%であった。
樹脂組成物5mgを試料とし、熱重量測定装置(Pyris TGA,Perkin Elmer社製)を用いて、重量がもとの重量の90%まで減少した時の温度を測定した。ここで、熱重量測定装置による測定は、窒素雰囲気下、気流速度:20mL/分、昇温速度:10℃/分、温度範囲:30〜550℃の条件下で行った。かかる温度が高いほど、熱安定性に優れる。
上記で得られた樹脂組成物の粉砕物を、ビジュアルアナライザー IRIS VA400(Alpha mos社製)にて、色番号「4094」(R:248、G:248、B:232)に対する色番号「3531」(R:216、G:200、B:184)が占める割合(「3531)/「4094」)を評価した。色番号「3531」は、濃い黄色味を有する色であり、色番号「4094」は、薄い黄色味を有する色であり、この割合が大きいほど、サンプルが黄色く着色していることを意味する。
これに対して特定微量のソルビン酸エステル(C)を含有する実施例1〜3の樹脂組成物は、比較例2よりもソルビン酸エステル(C)の配合量が少ないにもかかわらず、樹脂組成物の熱安定性が向上し、かつ着色についても改善するという顕著な効果が得られた。
樹脂の酸化劣化や熱分解等は化学反応であり、通常、化学反応の反応速度は温度の上昇に伴い指数関数的に上昇するため、特に今回のような高温での差異は、反応速度論の点から非常に大きな差異となるものである。
したがって、本発明の樹脂組成物は、熱安定性に優れ、かつ着色抑制効果に優れることがわかる。
Claims (6)
- エチレン−ビニルアルコール系共重合体(A)、ポリエステル系樹脂(B)およびソルビン酸エステル(C)を含有する樹脂組成物であって、上記ソルビン酸エステル(C)の含有量が、上記樹脂組成物の重量当たり0.00001〜10ppmであることを特徴とする樹脂組成物。
- 上記ポリエステル系樹脂(B)に対するエチレン−ビニルアルコール系共重合体(A)の重量含有比率が、エチレン−ビニルアルコール系共重合体(A)/ポリエステル系樹脂(B)=1/99〜99/1であることを特徴とする請求項1記載の樹脂組成物。
- 上記ポリエステル系樹脂(B)が、ポリエステル系熱可塑性エラストマーであることを特徴とする請求項1または2記載の樹脂組成物。
- 請求項1〜3のいずれか一項に記載の樹脂組成物からなることを特徴とする溶融成形用材料。
- 請求項1〜3のいずれか一項に記載の樹脂組成物からなる層を備えることを特徴とする多層構造体。
- 請求項5記載の多層構造体からなることを特徴とする液体包装用材料。
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JP7215172B2 (ja) | 2023-01-31 |
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US11345806B2 (en) | 2022-05-31 |
EP3715414B1 (en) | 2023-04-26 |
EP3715414A1 (en) | 2020-09-30 |
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