JP5034216B2 - Sls方式による造形用スチレン系樹脂粒子およびその製造方法造形物 - Google Patents
Sls方式による造形用スチレン系樹脂粒子およびその製造方法造形物 Download PDFInfo
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- JP5034216B2 JP5034216B2 JP2005320005A JP2005320005A JP5034216B2 JP 5034216 B2 JP5034216 B2 JP 5034216B2 JP 2005320005 A JP2005320005 A JP 2005320005A JP 2005320005 A JP2005320005 A JP 2005320005A JP 5034216 B2 JP5034216 B2 JP 5034216B2
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- rubber
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- styrene resin
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Polymerisation Methods In General (AREA)
Description
[スチレン系樹脂粒子]
ゴム質重合体(a)の存在下、芳香族モノビニル化合物もしくは芳香族モノビニル化合物と他のモノビニル化合物との混合物(b)を重合して得られるゴム強化スチレン系樹脂(A1)、または、芳香族モノビニル化合物もしくは芳香族モノビニル化合物と他のモノビニル化合物との混合物(b)の(共)重合体(A2)とゴム強化スチレン系樹脂(A1)とのコンパウンドから成るスチレン系樹脂粒子。
されたSLS方式による造形用スチレン系樹脂粒子が提供される。
重合成分の合計量100重量部に対し、通常0.05〜2重量部、好ましくは0.1〜1.5重量である。斯かる条件を満足することにより、数平均粒子径10〜100μmを特徴の1つとする後述のスチレン系樹脂粒子を得ることが出来る。
使用した評価方法は以下の通りである。
画像解析ソフト(Media Cybernetics社製「Image-Pro Plus」)を使用し、顕微鏡写真を画像解析することにより求めた。画像処理するサンプル数は100個以上とした。
上記のソフトを使用して求めた。ここで定義する真球度は、画像処理で得られた粒子の面積をS、粒子の周囲長をLとし、(L2)/(4πS)で得られる値を使用した。
JIS R9301−2−2に準じて測定した。
ISO 1133に準拠し、温度220℃、荷重10kgにて測定した。
直径5cmのアルミ皿に試料ペレット1gを秤量し、230℃にて1時間放置し、その溶融状態の表面形状を以下の表1に示す基準で評価した。
棒状バッフルと後退翼(直径55mm、翼幅10mm)を備えたステンレス製オートクレーブ(内容量5L、内径170mm)に以下の表2に示す成分を仕込んだ。
実施例1と同様のステンレス製オートクレーブに以下の表3に示す成分を仕込んだ。
棒状バッフルとアンカー型攪拌翼(翼径130mm、翼幅15mm)を備えたステンレス製オートクレーブ(内径140mm)に以下の表4に示す成分を仕込んだ。
棒状バッフルとアンカー型攪拌翼(翼径130mm、翼幅15mm)を備えたステンレス製オートクレーブ(内径140mm)に以下の表6に示す成分を仕込んだ。
実施例5と同様の棒状バッフルとアンカー型攪拌翼を備えたステンレス製オートクレーブ(内径140mm)に以下の表8に示す成分を仕込んだ。
棒状バッフルと直後退翼(径55mm、翼幅10mm)を備えたステンレス製オートクレーブ(内容量5L、内径170mm)に以下の表11に示す成分を仕込んだ。
比較例1で得られた共重合体粒子を、凍結粉砕し微粉粒子を得た。凍結粉砕は、液体窒素で凍結した共重合体を、マツボー社製ターボミルを用いて行った。評価結果を表15に示す。
棒状バッフルとアンカー型攪拌翼を備えたステンレス製オートクレーブ(内径140mm)に以下の表12に示す成分を仕込んだ。
Claims (10)
- 数平均粒子径10〜100μm、真球度1.5以下の粒子の占有率が70%以上であり、以下に規定するスチレン系樹脂粒子より成ることを特徴とするSLS方式による造形用スチレン系樹脂粒子(但し、上記の真球度は、画像処理で得られた粒子の面積をS、粒子の周囲長をLとし、(L2)/(4πS)で得られる値を意味する)。
[スチレン系樹脂粒子]
ゴム質重合体(a)の存在下、芳香族モノビニル化合物もしくは芳香族モノビニル化合物と他のモノビニル化合物との混合物(b)を重合して得られるゴム強化スチレン系樹脂(A1)、または、芳香族モノビニル化合物もしくは芳香族モノビニル化合物と他のモノビニル化合物との混合物(b)の(共)重合体(A2)とゴム強化スチレン系樹脂(A1)とのコンパウンドから成るスチレン系樹脂粒子。 - ゴム質重合体(a)が、エチレン−α−オレフィン系共重合ゴム、アクリル系ゴム、水素添加ゴム及びシリコーンゴムの群から選ばれた少なくとも1種のゴム質重合体である請求項1に記載のスチレン系樹脂粒子。
- ISO 1133に準拠し、温度220℃、荷重10kgの条件下に測定したメルトフローレートが5〜100g/10minである請求項1又は2に記載のスチレン系樹脂粒子。
- 懸濁重合により製造される請求項1〜3の何れかに記載のスチレン系樹脂粒子。
- 懸濁剤としてアクリル酸とアクリル酸エステル類の共重合体またはその塩を使用する請求項4に記載のスチレン系樹脂粒子。
- スチレン系樹脂粒子がゴム強化スチレン系樹脂であり、懸濁重合に先立ち塊状重合が行われる請求項4又は5に記載のスチレン系樹脂粒子。
- 重合率15〜50%まで塊状重合を行う請求項6に記載のスチレン系樹脂粒子。
- 懸濁剤の存在下、重合成分として、芳香族モノビニル化合物または芳香族モノビニル化合物と他のモノビニル化合物および/またはゴム質重合体との混合物を懸濁重合する方法であって、重合成分100重量部当り0.01〜4重量部の範囲でアクリル酸とアクリル酸エステル類の共重合体またはその塩から成る有機系懸濁剤を使用することを特徴とする、数平均粒子径10〜100μm、真球度1.5以下の粒子の占有率が70%以上であるSLS方式による造形用スチレン系樹脂粒子の製造方法(但し、上記の真球度は、画像処理で得られた粒子の面積をS、粒子の周囲長をLとし、(L2)/(4πS)で得られる値を意味する)。
- スチレン系樹脂粒子がゴム強化スチレン系樹脂であり、懸濁重合に先立ち塊状重合を行う請求項8に記載の製造方法。
- 重合率15〜50%まで塊状重合を行う請求項9に記載の製造方法。
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