JP4639847B2 - Polylactic acid resin molded body and polylactic acid resin composition - Google Patents
Polylactic acid resin molded body and polylactic acid resin composition Download PDFInfo
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- JP4639847B2 JP4639847B2 JP2005052476A JP2005052476A JP4639847B2 JP 4639847 B2 JP4639847 B2 JP 4639847B2 JP 2005052476 A JP2005052476 A JP 2005052476A JP 2005052476 A JP2005052476 A JP 2005052476A JP 4639847 B2 JP4639847 B2 JP 4639847B2
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Description
本発明は、耐衝撃性の改善されたポリ乳酸樹脂組成物に関する。 The present invention relates to a polylactic acid resin composition having improved impact resistance.
ポリ乳酸樹脂は、とうもろこしなどの植物から得られる樹脂であり、従来から用いられているポリスチレン、ポリプロピレン、ポリ塩化ビニル、ポリエチレンなどの石油系樹脂と異なり、石油資源枯渇防止、炭酸ガス排出抑制などの効果があるとされ、石油系樹脂に替わる材料として期待されている。 Polylactic acid resin is a resin obtained from plants such as corn, and unlike conventional petroleum resins such as polystyrene, polypropylene, polyvinyl chloride, polyethylene, etc., it can prevent the depletion of petroleum resources and suppress carbon dioxide emissions. It is said to be effective and is expected as a material to replace petroleum-based resins.
しかし、ポリ乳酸樹脂は耐衝撃性に劣るため、石油系樹脂に替わる材料とは成りにくいという問題点がある。そこでこの問題を解消するための手法として、ポリ乳酸樹脂にゴム成分を添加し耐衝撃性を向上した例が報告されている（特許文献１参照）。
上記の特許文献で提案されている手法では、ポリ乳酸樹脂に耐衝撃性が付与されるものの、ポリ乳酸樹脂の優れた光線透過率を保つことができず使用できる用途も限定される。 In the method proposed in the above-mentioned patent document, although the impact resistance is imparted to the polylactic acid resin, the excellent light transmittance of the polylactic acid resin cannot be maintained, and the usable applications are also limited.
本発明は、ポリ乳酸樹脂の有する優れた光線透過率を維持したまま、耐衝撃性が改良されたポリ乳酸樹脂組成物を提供することを目的とする。 An object of the present invention is to provide a polylactic acid resin composition having improved impact resistance while maintaining the excellent light transmittance of the polylactic acid resin.
本発明者は、ポリ乳酸樹脂にポリメチルぺンテン樹脂を添加することにより上記目的を達成できることを見出したものである。つまり、本発明は、ポリ乳酸樹脂（ａ）とポリメチルぺンテン樹脂（ｂ）とを含有し、前記（ａ）と（ｂ）との配合比（ａ）／（ｂ）が、９０／１０〜２０／８０のポリ乳酸樹脂組成物を用いて作製したポリ乳酸樹脂成形体の全光線透過率が、９２％以上９２．２％以下であることを特徴とするポリ乳酸樹脂組成物を要旨とする。 The present inventor has found that the above object can be achieved by adding a polymethylpentene resin to a polylactic acid resin. That is, the present invention contains a polylactic acid resin (a) and a polymethylpentene resin (b), and the blending ratio (a) / (b) between the above (a) and (b) is 90 / 10-10. The gist of the polylactic acid resin composition is characterized in that the total light transmittance of a polylactic acid resin molded article produced using a 20/80 polylactic acid resin composition is 92% or more and 92.2% or less. .
ポリ乳酸樹脂にポリメチルぺンテン樹脂を所定量添加することにより、ポリ乳酸樹脂の光線透過率は維持されたまま、耐衝撃性が改善されるという効果を奏する。
By adding a predetermined amount of the polymethyl pentene resins polylactic acid resin, the light transmittance of the polylactic acid resin while being maintained, an effect that impact resistance is improved.
本発明に用いられるポリ乳酸樹脂としては、Ｌ−乳酸、Ｄ−乳酸、ＬＤ−乳酸またはこれらの混合物を縮合脱水して得られるか、もしくは乳酸のラクチドを開環重合して得られたものが採用され、そのＬ−ポリ乳酸とＤ−ポリ乳酸の含有比率について制限はない。 The polylactic acid resin used in the present invention is obtained by condensation-dehydrating L-lactic acid, D-lactic acid, LD-lactic acid or a mixture thereof, or obtained by ring-opening polymerization of lactide of lactic acid. There is no limitation on the content ratio of L-polylactic acid and D-polylactic acid.
本発明のポリ乳酸樹脂組成物において、ポリ乳酸樹脂（ａ）とポリメチルぺンテン樹脂（ｂ）との配合比は９０／１０〜２０／８０の範囲である必要がある。ポリメチルぺンテン樹脂の比率が１０％未満では十分な耐衝撃性が得られず、また逆に８０％を超えることは植物由来物質であるポリ乳酸樹脂を利用し石油資源節約など環境へ配慮するという観点からは好ましくない。
In the polylactic acid resin composition of the present invention, the blending ratio of polylactic acid resin (a) and polymethyl pentene resin (b) should be in the range of 90 / 10-20 / 80. That the ratio of the polymethyl pentene resin does not sufficiently impact resistance is obtained with less than 10%, also exceeding 80% Conversely consideration the environment and the use and oil resource saving polylactic acid resin is a plant-derived material It is not preferable from the viewpoint.
上記組成物には本発明の特性を損なわない範囲で各種可塑剤、安定剤、難燃剤、離型剤、顔料、染料、フィラー類、その他添加剤を目的や用途に応じて使用することができる。 Various plasticizers, stabilizers, flame retardants, mold release agents, pigments, dyes, fillers, and other additives can be used in the composition according to the purpose and application within the range not impairing the characteristics of the present invention. .
ポリ乳酸樹脂として、商品名：レイシアＨ４００（三井化学株式会社製、重量平均分子量が２０万、Ｄ体の含有量が２％であるポリＬ−乳酸樹脂）を、またポリメチルぺンテン樹脂として、商品名：ＴＰＸＭＸ００２（三井化学株式会社製）を用意した。
As the polylactic acid resin, trade name: LACEA H400 (manufactured by Mitsui Chemicals, Inc., weight average molecular weight of 200,000, the content of D-poly L- acid resin is 2%), and also as a polymethyl pentene resin, product Name: TPXMX002 (Mitsui Chemicals) was prepared.
＜実施例１〜３、比較例１＞
上記のポリ乳酸樹脂およびポリメチルぺンテン樹脂を表１に示す配合比で混合し、溶融温度２４０℃、金型温度３０℃、冷却時間２５秒の条件で射出成形することにより試験片
を作成し、次の試験を行った。その結果を表１に併記する。
耐衝撃性：ＪＩＳ Ｋ ７１１０に準じてアイゾット衝撃強度（ノッチ有り）を測定した。
光線透過率：ＪＩＳ Ｋ ７１３６に準じて全光線透過率を測定した。
<Examples 1-3, Comparative Example 1>
The above polylactic acid resin and polymethyl pentene resin were mixed at the mixing ratio shown in Table 1, the melting temperature of 240 ° C., a mold temperature of 30 ° C., to prepare a test piece by injection molding under the conditions of cooling time 25 seconds, The following tests were conducted. The results are also shown in Table 1.
Impact resistance: Izod impact strength (notched) was measured according to JIS K 7110.
Light transmittance: The total light transmittance was measured according to JIS K7136.
＜参考例＞
ポリ乳酸樹脂のみで上記同様に射出成形をし試験を行った。その結果も表１に示す。
<Reference example>
The test was performed by injection molding in the same manner as described above using only the polylactic acid resin. The results are also shown in Table 1.
表１からわかるように、本発明に係る実施例１〜３においては、ポリ乳酸樹脂の光線透過率が維持されて衝撃強度が向上されている。一方、ポリメチルぺンテン樹脂が本発明の技術範囲より少ない量しか配合されていない比較例１においては、衝撃強度の向上がみられないことがわかる。
As can be seen from Table 1, in Examples 1 to 3 according to the present invention, the light transmittance of the polylactic acid resin is maintained and the impact strength is improved. On the other hand, in Comparative Example 1, polymethyl pentene resin is not only incorporated an amount less than the scope of the present invention, it can be seen that the improvement in impact strength is not observed.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2005052476A JP4639847B2 (en) | 2005-02-28 | 2005-02-28 | Polylactic acid resin molded body and polylactic acid resin composition |
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| JP2005052476A JP4639847B2 (en) | 2005-02-28 | 2005-02-28 | Polylactic acid resin molded body and polylactic acid resin composition |
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| Publication Number | Publication Date |
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| JP2006233109A JP2006233109A (en) | 2006-09-07 |
| JP4639847B2 true JP4639847B2 (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2005052476A Expired - Fee Related JP4639847B2 (en) | 2005-02-28 | 2005-02-28 | Polylactic acid resin molded body and polylactic acid resin composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105726155B (en) * | 2016-01-30 | 2018-05-29 | 采纳科技股份有限公司 | Reusable imitative glass type syringe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001049004A (en) * | 1999-08-10 | 2001-02-20 | Toyobo Co Ltd | White aliphatic polyester film |
| JP2002146071A (en) * | 2000-11-16 | 2002-05-22 | Toray Ind Inc | White polylactic acid film |
| JP2002363322A (en) * | 2001-06-12 | 2002-12-18 | Toray Ind Inc | White polyester film |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001049004A (en) * | 1999-08-10 | 2001-02-20 | Toyobo Co Ltd | White aliphatic polyester film |
| JP2002146071A (en) * | 2000-11-16 | 2002-05-22 | Toray Ind Inc | White polylactic acid film |
| JP2002363322A (en) * | 2001-06-12 | 2002-12-18 | Toray Ind Inc | White polyester film |
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| JP2006233109A (en) | 2006-09-07 |
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