JP2005187017A - プラスチックキャップ - Google Patents
プラスチックキャップ Download PDFInfo
- Publication number
- JP2005187017A JP2005187017A JP2003432282A JP2003432282A JP2005187017A JP 2005187017 A JP2005187017 A JP 2005187017A JP 2003432282 A JP2003432282 A JP 2003432282A JP 2003432282 A JP2003432282 A JP 2003432282A JP 2005187017 A JP2005187017 A JP 2005187017A
- Authority
- JP
- Japan
- Prior art keywords
- plastic cap
- starch
- acid
- coating layer
- top surface
- 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.)
- Pending
Links
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- CLYZNABPUKUSDX-UHFFFAOYSA-N trichloromethoxybenzene Chemical compound ClC(Cl)(Cl)OC1=CC=CC=C1 CLYZNABPUKUSDX-UHFFFAOYSA-N 0.000 abstract description 6
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- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
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Landscapes
- Closures For Containers (AREA)
Abstract
【解決手段】 天面と、天面周縁から降下したスカート状側壁とを備えたプラスチックキャップにおいて、少なくとも前記天面には、架橋構造を有する高水素結合ポリマー成分から成るコーティング層が設けられていることを特徴とする。
【選択図】 なし
Description
少なくとも前記天面には、架橋構造を有する高水素結合ポリマー成分から成るコーティング層が設けられていることを特徴とするプラスチックキャップが提供される。
(1)前記コーティング層は、天面外面に形成されていること、
(2)前記コーティング層形成面には、予めフレーム処理或いはコロナ処理が施されていること、
(3)前記ポリマー成分がN−メチロール系(メタ)アクリルアミドを架橋点として有するものであること、
(4)臭気発生成分含有雰囲気中に保持される容器に適用されること、
が好ましい。
本発明において、プラスチックキャップの少なくとも天面に設けられるコーティング層は、架橋構造を有する高水素結合ポリマー成分により形成される。
本発明において、上記のような架橋構造を有する高水素結合ポリマー成分からなるコーティング層を形成するプラスチックキャップの構造は、特に限定されるものではないが、一般的には、図1に示すような構造を有する。
前述した架橋構造を有する高水素結合ポリマー成分からなるコーティング層は、キャップの天面1に形成されるが、一般的には、ボトル内容物との接触を回避できることから、天面1の外面に形成することが好ましい。また、天面1の内面にライナー材が設けられているときには、天面1の内面にコーティング層を形成することもできる。また、天面1にコーティング層が形成されている限り、例えばスカート状側壁2の外面にコーティング層が形成されていてもよい。
市販品の20度焼酎を容量が2.7Lのポリエステルボトルに充填し、所定の36mm径プラスチックキャップを巻締めた。本ポリエステルボトルを、TCA雰囲気濃度200ppbに調整したデシケータ内に正立状態で並べ、40℃の雰囲気温度下にて保管した。1週間及び4週間経時後に、本ポリエステルボトルを各々デシケータから取り出し、内容液の焼酎50mlに対してヘキサン20mlを加え、振とう抽出した。分液した抽出液を、島津製作所製、ガスクロマトグラフ質量分析装置(GC−MS QP5000)に注入し、TCAの移行量を定量した。カラムは、SUPELCO社製、SPB−20を用いた。
キャップをPETボトルに巻締めた状態でのキャップ部からの酸素透過量を、Modern Control社製、酸素透過量測定装置(OX−TRAN2/21)を用いて測定した。測定条件は、環境温度25℃及び40℃、相対湿度65%である。
デキストリン(日澱化学(株)製、アミコール7H)100重量部に対して、
層状無機化合物として合成雲母(コープケミカル(株)製、ソマシフME−100)を用い、合成雲母が30重量部になるように、室温下で水中にて混合し、固形分濃度が16.6重量%になるよう調製した。その後90℃で2時間撹拌した後、撹拌を続けながら室温まで冷却した。
上記混合溶液中のデキストリン100重量部に対して、N−メチロールアクリルアミド/アクリルアミド共重合体(重量比50/50、数平均分子量4.8万、重量平均分子量23万)30重量部を、水/2−プロパノール混合液中(重量比50/50)に溶解させ、固形分濃度が5.3重量%になるよう調製した。
上記デキストリン/合成雲母混合分散液を撹拌しながら、上記N−メチロールアクリルアミド/アクリルアミド共重合体溶液を滴下し、滴下終了後、更に1時間撹拌した。その後超高圧型ホモジナイザー(ナノマイザー(株)製、ナノマイザー)によって、1000kgfの加圧下で10分間処理した。
上記分散液中のデキストリン、合成雲母、N−メチロールアクリルアミド/アクリルアミド共重合体の3成分の合計100重量部に対し、酸性触媒であるパラトルエンスルホン酸を5重量部添加し、更に水で総固形分濃度が7重量%になるよう希釈して、コーティング層形成用塗料を得た。
高密度ポリエチレンを用いて、圧縮成形により作製したプラスチックキャップの天面外面にフレーム処理を行った後、日本文化精工(株)製、手動タンポ印刷機を用いて上記コーティング層形成用塗料を塗布した。その後ガスオーブンにより、ピーク温度120℃、ピーク温度保持時間0秒になるよう熱処理を行い、膜厚が2.5μmのコーティング層を有するプラスチックキャップを得た。
実施例1と同様の方法で作製した高密度ポリエチレンのプラスチックキャップを、未コーティングのプラスチックキャップとした。
上記実施例及び比較例で得られたプラスチックキャップの、TCA及び酸素バリア性の測定結果を表1に示す。
2:スカート状側壁
3:螺条
Claims (5)
- 天面と、天面周縁から降下したスカート状側壁とを備えたプラスチックキャップにおいて、
少なくとも前記天面には、架橋構造を有する高水素結合ポリマー成分から成るコーティング層が設けられていることを特徴とするプラスチックキャップ。 - 前記コーティング層は、天面外面に形成されている請求項1に記載のプラスチックキャップ。
- 前記コーティング層形成面には、予めフレーム処理或いはコロナ処理が施されている請求項1または2に記載のプラスチックキャップ。
- 前記ポリマー成分がN−メチロール系(メタ)アクリルアミドを架橋点として有するものである請求項1乃至3の何れかに記載のプラスチックキャップ。
- 臭気発生成分含有雰囲気中に保持される容器に適用される請求項1乃至4の何れかに記載のプラスチックキャップ。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008207820A (ja) * | 2007-02-23 | 2008-09-11 | Japan Crown Cork Co Ltd | ガスバリア性に優れたプラスチックキャップ |
JP2009073506A (ja) * | 2007-09-19 | 2009-04-09 | Japan Crown Cork Co Ltd | プラスチックキャップ |
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2003
- 2003-12-26 JP JP2003432282A patent/JP2005187017A/ja active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008207820A (ja) * | 2007-02-23 | 2008-09-11 | Japan Crown Cork Co Ltd | ガスバリア性に優れたプラスチックキャップ |
JP2009073506A (ja) * | 2007-09-19 | 2009-04-09 | Japan Crown Cork Co Ltd | プラスチックキャップ |
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