JP4653812B2 - 多層構造体及びその製造方法 - Google Patents
多層構造体及びその製造方法 Download PDFInfo
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- JP4653812B2 JP4653812B2 JP2007545133A JP2007545133A JP4653812B2 JP 4653812 B2 JP4653812 B2 JP 4653812B2 JP 2007545133 A JP2007545133 A JP 2007545133A JP 2007545133 A JP2007545133 A JP 2007545133A JP 4653812 B2 JP4653812 B2 JP 4653812B2
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- polyolefin
- multilayer structure
- thermoplastic resin
- extruder
- layer
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- 238000010030 laminating Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- XJRBAMWJDBPFIM-UHFFFAOYSA-N methyl vinyl ether Chemical compound COC=C XJRBAMWJDBPFIM-UHFFFAOYSA-N 0.000 description 1
- WFKDPJRCBCBQNT-UHFFFAOYSA-N n,2-dimethylprop-2-enamide Chemical compound CNC(=O)C(C)=C WFKDPJRCBCBQNT-UHFFFAOYSA-N 0.000 description 1
- QRWZCJXEAOZAAW-UHFFFAOYSA-N n,n,2-trimethylprop-2-enamide Chemical compound CN(C)C(=O)C(C)=C QRWZCJXEAOZAAW-UHFFFAOYSA-N 0.000 description 1
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 1
- YPHQUSNPXDGUHL-UHFFFAOYSA-N n-methylprop-2-enamide Chemical compound CNC(=O)C=C YPHQUSNPXDGUHL-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- FJXWKBZRTWEWBJ-UHFFFAOYSA-N nonanediamide Chemical compound NC(=O)CCCCCCCC(N)=O FJXWKBZRTWEWBJ-UHFFFAOYSA-N 0.000 description 1
- YCIMNLLNPGFGHC-UHFFFAOYSA-N o-dihydroxy-benzene Natural products OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000120 polyethyl acrylate Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- LGQXXHMEBUOXRP-UHFFFAOYSA-N tributyl borate Chemical compound CCCCOB(OCCCC)OCCCC LGQXXHMEBUOXRP-UHFFFAOYSA-N 0.000 description 1
- AJSTXXYNEIHPMD-UHFFFAOYSA-N triethyl borate Chemical compound CCOB(OCC)OCC AJSTXXYNEIHPMD-UHFFFAOYSA-N 0.000 description 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 description 1
- LTEHWCSSIHAVOQ-UHFFFAOYSA-N tripropyl borate Chemical compound CCCOB(OCCC)OCCC LTEHWCSSIHAVOQ-UHFFFAOYSA-N 0.000 description 1
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08F8/42—Introducing metal atoms or metal-containing groups
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- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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- C08L91/06—Waxes
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- C09J123/04—Homopolymers or copolymers of ethene
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- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2423/00—Presence of polyolefin
- C09J2423/006—Presence of polyolefin in the substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
ホウ素含有官能基が重合体の末端のみに結合している場合は、特に高分子量の重合体では官能基量が相対的に低くなり、熱可塑性樹脂(a1)の反応性が不十分となるおそれがある。側鎖および末端にホウ素含有官能基を含有していても良い。
2層:A/B1
3層:B1/A/B2
4層:B1/A/Reg/B2
5層:B2/A/B1/A/B2、B2/A/B1/A/Reg、
B1/A/B2/Reg/B2
6層:B2/Reg/A/B1/A/B2
7層:B2/Reg/A/B1/A/Reg/B2
多層シートを押出方向と垂直な方向に切断し、接着性樹脂組成物(A)層の断面を透過型電子顕微鏡で3万倍にて撮影し、接着性樹脂組成物(A)層の構造を観察した。主要な粒子が粒子として認識でき、背景が黒く連続化しないようしきい値を設定し、撮影された画像を白黒二値化した。前記二値化した画像のうち、接着性樹脂組成物(A)層とEVOH(B1)層の界面を一辺に含む1.6μm×1.6μm中に含まれる全粒子の長径と短径を測定し、これらの総平均を平均粒子径とした。このとき、画面の濃淡と区別のつかない0.0005μm以下のドットについては測定対象としなかった。
スチレン−水添ブタジエン−スチレンブロック共重合体(SEBS、スチレン/水添ブタジエン=16/84(重量比)、ブタジエン単位の水添率94%、二重結合量960μeq/g、メルトフローレート5g/10分(230℃、2160g荷重))を、投入口を1L/分の窒素で置換しながら7kg/時の速度で二軸押出機に供給した。次に、液体フィーダー1よりボラン−トリエチルアミン錯体(TEAB)とホウ酸1,3−ブタンジオールエステル(BBD)の混合液(TEAB/BBD=29/71、重量比)を0.6kg/時の速度で、液体フィーダー2より1,3−ブタンジオールを0.4kg/時の速度で供給し、連続的に混錬した。混錬の間、ベント1及びベント2のゲージが約20mmHgを示すように圧力を調節した。その結果、吐出口から7kg/時の速度で、ボロン酸1,3−ブタンジオールエステル基(BBDE)を含有するSEBS(X−1)が得られた。このSEBSのボロン酸1,3−ブタンジオールエステル基量は650μeq/g、二重結合量は115μeq/g、メルトフローレートは1.6g/10分(190℃、2160g荷重)であった。
同方向二軸押出機TEM−35B(東芝機械製)
スクリュー径:37mmφ
L/D:52(15ブロック)
液体フィーダー:C3(液体フィーダー1)、C11(液体フィーダー2)
ベント位置:C6(ベント1)、C14(ベント2)
スクリュー構成:C5−C6間、C10−C11間及びC12の位置にシールリングを使用。
シリンダー設定温度:C1(水冷)、C2〜C3(200℃)、C4〜C15(250℃)、ダイ(250℃)
スクリュー回転数:400rpm
合成例1において、スチレン/水添ブタジエン=16/84(重量比)、ブタジエン単位の水添率94%、二重結合量960μeq/g、メルトフローレート3g/10分(230℃、2160g荷重)のスチレン−水添ブタジエン−スチレンブロック共重合体を用いた以外は、合成例1と同様にボロン酸1,3−ブタンジオールエステル基(BBDE)を含有するSEBS(X−2)を合成した。SEBS(X−2)のボロン酸1,3−ブタンジオールエステル基量は650μeq/g、二重結合量は115μeq/g、メルトフローレートは0.6g/10分(190℃、2160g荷重)であった。
合成例1で得られたSEBS(X−1)のペレットと、三井化学株式会社製直鎖状低密度ポリエチレン(LLDPE)「ウルトゼックス2022L」(メルトフローレート2.1g/10分:190℃、2160g荷重、密度0.919g/cm3)のペレットとを4/96の重量比でタンブラーを使用してドライブレンドし、両ペレットの混合物を得た。
押出機1[HDPE(B2)]:
装置:株式会社プラスチック工学研究所製単軸押出機「GT−32−A型」
スクリュー径:32mmφ
スクリュー回転数:62rpm
シリンダー設定温度:220℃
押出機2[接着性樹脂組成物(A)]:
装置:大阪精機工作株式会社製単軸押出機「P25−18AC」
スクリュー径:25mmφ
スクリュー構成:フルフライト
L/D:18
スクリュー回転数:30rpm
スクリュー外周の線速度:2.36m/分
シリンダー設定温度:220℃
吐出量:約1kg/時
押出機内滞留時間:約9分
ダイス内滞留時間:約2分
押出機3[EVOH(B1)]:
装置:株式会社東洋精機製作所製単軸押出機「ラボME型CO−NXT」
スクリュー径:20mmφ
スクリュー回転数:18rpm
シリンダー設定温度:220℃
ダイスサイズ:300mm
シート引取り速度:4m/分
冷却ロール温度:50℃
実施例1において、SEBS(X−1)の代わりに合成例2で得られたSEBS(X−2)を用いた以外は実施例1と同様にして多層構造体を得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、接着性樹脂組成物(A)を導入する押出機2の回転数を1.6倍(48rpm)とし、スクリュー外周の線速度を3.77m/分とした。このとき、押出機1及び2の回転数も1.6倍にし、シート引取り速度も1.6倍にした。これらの点以外は実施例1と同様にして、実施例1と同じ厚み構成の多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、ドライブレンドされる直鎖状低密度ポリエチレン(LLDPE)の代わりに旭化成ケミカルズ株式会社製低密度ポリエチレン(LDPE)「サンテックL2340」(メルトフローレート3.8g/10分:190℃、2160g荷重、密度0.923g/cm3)を使用した以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、ドライブレンドされる直鎖状低密度ポリエチレン(LLDPE)の代わりに三井デュポン株式会社製エチレン−酢酸ビニル共重合樹脂(EVAc)「EV360」(メルトフローレート2.0g/10分:190℃、2160g荷重、密度0.950g/cm3)を使用した以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、多層シートの外層に配置される直鎖状低密度ポリエチレン(LLDPE)の代わりに、日本ポリプロ株式会社製ポリプロピレン(PP)「EG7F」(メルトフローレート1.3g/10分:190℃、2160g荷重)を使用した以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、SEBS(X−1)と、直鎖状低密度ポリエチレン(LLDPE)との配合重量比を2/98にした以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において押出機2にペレットの混合物を導入する代わりに、予め二軸押出機で溶融混錬して得た樹脂組成物のペレットを導入した以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。溶融混錬に使用した二軸押出機の構成及び運転条件は下記のとおりである。
同方向二軸押出機ラボプラストミル(株式会社東洋精機製作所製)
軸構成:同方向二軸
スクリュー径:25mmφ
L/D:25
シリンダー設定温度:220℃
スクリュー回転数:150rpm
スクリュー外周の線速度:11.78m/分
フィード樹脂量:5kg/時
滞留時間:2分
実施例1において、SEBS(X−1)と、直鎖状低密度ポリエチレン(LLDPE)との配合重量比を0.5/99.5にした以外は、実施例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、接着性樹脂組成物(A)を導入する押出機2の回転数を3.73倍(112rpm)とし、スクリュー外周の線速度を8.80m/分とした。このとき、押出機1の回転数を1.87倍にし、押出機2の回転数を3.73倍にし、シート引取り速度を3.73倍にした。これらの点以外は実施例1と同様にして、HDPE/接着性樹脂組成物(A)/EVOH/接着性樹脂組成物(A)/HDPE=25/10/10/10/25μmの3種5層の多層シートを共押出成形により製造した。得られた多層シートを実施例1と同様に評価した結果を表1にまとめて示す。
実施例1において、接着性樹脂組成物(A)を導入する押出機2の回転数を0.33倍(10rpm)とし、スクリュー外周の線速度を0.79m/分とした。このとき、押出機1及び2の回転数も0.33倍にし、シート引取り速度も0.33倍にした。これらの点以外は実施例1と同様にして、実施例1と同じ厚み構成の多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
比較例1において、溶融混練される直鎖状低密度ポリエチレン(LLDPE)の代わりに旭化成ケミカルズ株式会社製低密度ポリエチレン(LDPE)「サンテックL2340」(メルトフローレート3.8g/10分:190℃、2160g荷重、密度0.923g/cm3)を使用した以外は、比較例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
比較例1において、溶融混練される直鎖状低密度ポリエチレン(LLDPE)の代わりに三井デュポン株式会社製エチレン−酢酸ビニル共重合樹脂(EVAc)「EV360」(メルトフローレート2.0g/10分:190℃、2160g荷重、密度0.950g/cm3)を使用した以外は、比較例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
比較例1において、多層シートの外層に配置される直鎖状低密度ポリエチレン(LLDPE)の代わりに、日本ポリプロ株式会社製ポリプロピレン(PP)「EG7F」(メルトフローレート1.3g/10分:190℃、2160g荷重)を使用した以外は、比較例1と同様にして多層シートを得た。実施例1と同様に評価した結果を表1にまとめて示す。
合成例1で得られたSEBS(X−1)のペレットと、三井化学株式会社製低密度ポリエチレン(LDPE)「ミラソン102」(メルトフローレート0.35g/10分:190℃、2160g荷重、密度0.919g/cm3)のペレットとを10/90の重量比でタンブラーを使用してドライブレンドし、両ペレットの混合物を得た。
装置:鈴木鉄工所製4種7層ダイレクトブロー成形機
単軸押出機1(HDPE):
スクリュー径:45mmφ、
スクリュー回転数:20rpm
シリンダー設定温度:200℃
単軸押出機2(HDPE):
スクリュー径:40mmφ、
スクリュー回転数:17rpm
シリンダー設定温度:200℃
単軸押出機3(接着性樹脂組成物(A))
スクリュー径:35mmφ
スクリュー構成:フルフライト
L/D:23
スクリュー回転数:11rpm
シリンダー設定温度:200℃
吐出量:約0.7kg/時
押出機内滞留時間:約10分
単軸押出機4(EVOH):
スクリュー径:35mmφ
スクリュー回転数:5.3rpm
シリンダー設定温度:210℃
Claims (9)
- 接着性樹脂組成物(A)からなる層と他の樹脂(B)からなる層を有する多層構造体であって、接着性樹脂組成物(A)が、ボロン酸基及び水の存在下でボロン酸基に転化し得るホウ素含有基からなる群より選ばれる少なくとも1種の官能基を含有する熱可塑性樹脂(a1)と、前記官能基を含有しないポリオレフィン(a2)とからなり、熱可塑性樹脂(a1)とポリオレフィン(a2)との配合重量比(a1/a2)が1/99〜15/85であり、かつポリオレフィン(a2)からなるマトリックス中に、熱可塑性樹脂(a1)の粒子が0.1〜1.2μmの平均粒子径で分散していることを特徴とする多層構造体。
- 熱可塑性樹脂(a1)のメルトフローレート(190℃、2160g荷重)が0.7〜4g/10分である請求項1記載の多層構造体。
- ポリオレフィン(a2)のメルトフローレート(190℃、2160g荷重)が0.1〜10g/10分である請求項1又は2記載の多層構造体。
- 他の樹脂(B)が、エチレン−ビニルアルコール共重合体(B1)である請求項1〜3のいずれか記載の多層構造体。
- エチレン−ビニルアルコール共重合体(B1)からなる層とポリオレフィン(B2)からなる層とが、接着性樹脂組成物(A)からなる層を介して積層されてなる請求項4記載の多層構造体。
- 複数の押出機が備えられた共押出成形機を用い、一の押出機に熱可塑性樹脂(a1)のペレットとポリオレフィン(a2)のペレットとを投入し、他の押出機に他の樹脂(B)のペレットを投入して、共押出法によって成形することを特徴とする請求項1〜5のいずれか記載の多層構造体の製造方法。
- 熱可塑性樹脂(a1)のペレットとポリオレフィン(a2)のペレットとを予めドライブレンドしてから押出機に投入する請求項6記載の多層構造体の製造方法。
- 熱可塑性樹脂(a1)のペレットとポリオレフィン(a2)のペレットとが投入される押出機が単軸押出機である請求項6又は7記載の多層構造体の製造方法。
- 前記単軸押出機におけるスクリュー外周の線速度が0.8〜8m/分である請求項8記載の多層構造体の製造方法。
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