JP2013159661A - 光学レンズの製造方法 - Google Patents
光学レンズの製造方法 Download PDFInfo
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- JP2013159661A JP2013159661A JP2012020967A JP2012020967A JP2013159661A JP 2013159661 A JP2013159661 A JP 2013159661A JP 2012020967 A JP2012020967 A JP 2012020967A JP 2012020967 A JP2012020967 A JP 2012020967A JP 2013159661 A JP2013159661 A JP 2013159661A
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- optical lens
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- thermoplastic resin
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Abstract
【解決手段】透明熱可塑性樹脂と架橋助剤を混合し得られた樹脂混合物を射出成形してなる成形体に電離放射線を照射して前記透明熱可塑性樹脂を架橋する光学レンズの製造方法であって、前記樹脂混合物中に、安定剤を配合しない又は安定剤を前記透明熱可塑性樹脂100重量部に対し0.1重量部未満配合し、前記混合後の樹脂混合物の熱履歴を所定値以下とすることを特徴とする光学レンズの製造方法、及びこの製造方法により製造される樹脂製の光学レンズ。
【選択図】なし
Description
テレフタル酸、及び2,2,4−トリメチルヘキサメチレンジアミンと2,4,4−トリメチルヘキサメチレンジアミンとの異性体混合物からなるポリアミド、
イソフタル酸及び1,6−ヘキサメチレンジアミンからなるポリアミド、
テレフタル酸/イソフタル酸、及び1,6−ヘキサメチレンジアミンからなるコポリアミド、
イソフタル酸、及び3,3′−ジメチル−4,4′−ジアミノジシクロヘキシルメタン、及びラウリンラクタム又はカプロラクタムからなるコポリアミド、
1,12−ドデカンジカルボン酸又は1,10−デカンジカルボン酸、及び3,3′−ジメチル−4,4′−ジアミノジシクロヘキシルメタン、場合によってはさらにラウリンラクタム又はカプロラクタムからなる(コ)ポリアミド、
イソフタル酸、及び4,4′−ジアミノジシクロヘキシルメタン、及びラウリンラクタム又はカプロラクタムからなるコポリアミド、
1,12−ドデカン二酸、及び4,4′−ジアミノジシクロヘキシルメタンからなるポリアミド、
テレフタル酸/イソフタル酸混合物、及び3,3′−ジメチル−4,4′−ジアミノジシクロヘキシルメタン、及びラウリンラクタムからなるコポリアミド、等を挙げることができる。
(環状ポリオレフィン)
・アベル6015T(三井化学社製)
(透明ポリアミド樹脂)
・1,10−デカンジカルボン酸及び3,3′−ジメチル−4,4′−ジアミノジシクロヘキシルメタンの縮合重合体(グリルアミドTR−90;エムスケミー・ジャパン社製;表中では、TR−90と表す。)
(安定剤)
・メチルエチルハイドロキノン(表中では、MEHQと表す。)
・2,5−ジ−tert−ブチルヒドロキノン(精工化学社製;ノンフレックスアルバ;表中では、「NFA」と表す。)
表1、2に示す比較例1及び実施例1〜6では、以下に示す一体型成形により、成形体試料を作製した。(表1、2中の「混合・成形」の欄に「一体型成形」と示す。)
JIS K 7361に準拠して測定した。可視光線の範囲(波長400〜800nmの範囲)において入射光量T1と試験片を通った全光量T2との比を百分率で示す。
[加熱後透過率]
試料を200℃に5分間保った。その後、前記と同様にして全光線透過率を測定した。
[貯蔵弾性率]
200℃で10分間加熱した後の試料について、アイティー計測制御社製DVA−200による粘弾性測定器により、10℃/minの昇温速度にて測定した270℃での貯蔵弾性率である。
2 スクリュー
3 モーター
4 ペレット投入部
5 混合機
6 ポンプ
7 金型
Claims (8)
- 透明熱可塑性樹脂と架橋助剤を混合して樹脂混合物を得る混合工程、前記樹脂混合物を射出成形して成形体を得る成形工程、及び前記成形体に電離放射線を照射して前記透明熱可塑性樹脂を架橋する架橋工程を有する光学レンズの製造方法であって、前記混合工程における加工時間をΔTm(秒)、樹脂混合物の温度をTm(℃)、前記成形工程における加工時間をΔTinj(秒)、樹脂混合物の温度をTinj(℃)、前記透明熱可塑性樹脂のガラス転移点をTg0(℃)としたとき、H=(Tm−Tg0)×ΔTm+(Tinj−Tg0)×ΔTinjで表される熱履歴Hが、15000(℃・秒)以下であることを特徴とする光学レンズの製造方法。
- 前記混合工程後、前記樹脂混合物の溶融状態を維持したまま成形することを特徴とする請求項1に記載の光学レンズの製造方法。
- 架橋助剤及び/又は可塑剤の添加により、ガラス転移点Tgを前記透明熱可塑性樹脂のガラス転移点Tg0より5℃以上下げた状態で混合工程及び成形工程を行うことを特徴とする請求項1又は請求項2に記載の光学レンズの製造方法。
- 前記樹脂混合物中に、安定剤を配合しない又は安定剤を前記透明熱可塑性樹脂100重量部に対し0.1重量部未満配合することを特徴とする請求項1ないし請求項3のいずれか1項に記載の光学レンズの製造方法。
- 前記透明熱可塑性樹脂が、透明ポリアミド樹脂、透明ポリエステル樹脂、透明フッ素樹脂、ポリメチルメタクリレート、ポリカーボネート、又は透明ポリオレフィンであることを特徴とする請求項1ないし請求項4のいずれか1項に記載の光学レンズの製造方法。
- 前記透明熱可塑性樹脂が、1,10−デカンジカルボン酸及び3,3′−ジメチル−4,4′−ジアミノジシクロヘキシルメタンの縮合重合体であることを特徴とする請求項1ないし請求項4のいずれか1項に記載の光学レンズの製造方法。
- 前記架橋助剤がトリアリルイソシアヌレートであることを特徴とする請求項1ないし請求項6のいずれか1項に記載の光学レンズの製造方法。
- 請求項1ないし請求項7のいずれか1項に記載の光学レンズの製造方法により製造されたことを特徴とし、その厚さを1mmとしたときの全光線透過率が60%以上であり、200℃で5分間加熱後の前記全光線透過率が60%以上であり、かつ270℃での貯蔵弾性率が、0.1MPa以上であることを特徴とする光学レンズ。
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