JP2007063516A - Resin composition - Google Patents
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Abstract
Description
本発明は、樹脂組成物に関し、詳細には、耐熱性・耐衝撃性に優れた樹脂組成物に関する。 The present invention relates to a resin composition, and in particular, to a resin composition excellent in heat resistance and impact resistance.
従来より、（生分解性）樹脂組成物の材料としてポリ乳酸が用いられている。しかし、ポリ乳酸は一般に固く、耐衝撃性に劣るという性質を有しているため、その用途が限られてしまう傾向があった。
これに対して、例えば、特許文献１には、乳酸単位とポリエステル単位とからなる耐衝撃性付与剤をポリヒドロキシカルボン酸に付与することで、ブリードアウトを起こしにくく、柔軟性および透明性を維持しつつ、耐衝撃性を有するポリエステル組成物を得る技術が開示されている。
Conventionally, polylactic acid has been used as a material for a (biodegradable) resin composition. However, since polylactic acid is generally hard and has a property of being inferior in impact resistance, its use tends to be limited.
On the other hand, for example, in Patent Document 1, by applying an impact resistance imparting agent composed of a lactic acid unit and a polyester unit to polyhydroxycarboxylic acid, bleeding out hardly occurs, and flexibility and transparency are maintained. However, a technique for obtaining a polyester composition having impact resistance is disclosed.
しかしながら、上記技術では、ポリヒドロキシカルボン酸と混合される耐衝撃性付与剤の相溶性が不十分であり、低比率時の硬化が低いため、充分な耐衝撃性の改善効果を得るためには、ポリエステル組成物における耐衝撃性付与剤の混合比率を上げる必要がある。一方、耐衝撃性付与剤は柔軟性が高いため耐衝撃性付与剤の混合比率を上げると柔軟性の向上に伴い軟化温度が低下してしまい、耐熱性に劣るという問題がある。
本発明は、上記課題を解決する為になされたものであり、耐熱性、耐衝撃性に優れた樹脂組成物を提供することを目的とする。
However, in the above technique, since the compatibility of the impact resistance imparting agent mixed with the polyhydroxycarboxylic acid is insufficient and the curing at a low ratio is low, in order to obtain a sufficient impact resistance improvement effect It is necessary to increase the mixing ratio of the impact resistance imparting agent in the polyester composition. On the other hand, since the impact resistance-imparting agent has high flexibility, when the mixing ratio of the impact resistance imparting agent is increased, the softening temperature is lowered with the improvement of the flexibility, and there is a problem that the heat resistance is inferior.
This invention is made | formed in order to solve the said subject, and it aims at providing the resin composition excellent in heat resistance and impact resistance.
本発明者は、鋭意検討を重ねた結果、以下の構成を採用することによって、上記目的が達成され、本発明を成すに至った。
即ち本発明は、以下の通りである。
（１）ポリＬ−乳酸と、結晶化促進剤と、柔軟性付与剤と、相溶化剤と、ポリ乳酸の融点（１８０℃以上）で安定でありかつ生分解性のある化学合成繊維とを含む樹脂組成物。
（２）化学合成繊維がポリビニルアルコールまたは４ナイロンである前記（１）に記載の樹脂組成物。
（３）結晶化促進剤がポリ−Ｄ乳酸またはＤ−乳酸−デンプン共重合樹脂からなるＡ成分と、融点または軟化点がポリ乳酸の融点または軟化点以下である生分解樹脂からなるＢ成分とのブロック重合体である前記（１）または（２）に記載の樹脂組成物。
（４）柔軟性付与剤がポリカプロラクトンである前記（１）〜（３）のいずれかに記載の樹脂組成物。
（５）相溶化剤がポリＬ−乳酸−ポリブチレンサクシネートブロック共重合樹脂である前
記（１）〜（４）のいずれかに記載の樹脂組成物。
As a result of intensive studies, the present inventor has achieved the above object by adopting the following configuration, and has achieved the present invention.
That is, the present invention is as follows.
(1) Poly L-lactic acid, a crystallization accelerator, a flexibility imparting agent, a compatibilizing agent, and a chemically synthesized fiber that is stable and biodegradable at the melting point of polylactic acid (180 ° C. or higher). A resin composition comprising.
(2) The resin composition according to (1), wherein the chemically synthesized fiber is polyvinyl alcohol or 4 nylon.
(3) A component comprising a poly-D lactic acid or D-lactic acid-starch copolymer resin as a crystallization accelerator, and a B component comprising a biodegradable resin having a melting point or softening point equal to or lower than that of polylactic acid. The resin composition as described in (1) or (2) above, which is a block polymer.
(4) The resin composition according to any one of (1) to (3), wherein the flexibility-imparting agent is polycaprolactone.
(5) The resin composition according to any one of (1) to (4), wherein the compatibilizing agent is a poly L-lactic acid-polybutylene succinate block copolymer resin.
本発明の樹脂組成物は、ポリＬ−乳酸と、結晶化促進剤と、柔軟性付与剤と、相溶化剤と、ポリビニルアルコール繊維（ＰＶＡ繊維）等のポリ乳酸の融点（１８０℃以上）で安定でありかつ生分解性のある化学合成繊維とを含むことにより、耐熱性、耐衝撃性に優れたものとすることができる。 The resin composition of the present invention has a poly L-lactic acid, a crystallization accelerator, a flexibility imparting agent, a compatibilizing agent, and a melting point (180 ° C. or higher) of polylactic acid such as polyvinyl alcohol fiber (PVA fiber). By including a chemically synthetic fiber which is stable and biodegradable, it can be made excellent in heat resistance and impact resistance.
以下、本発明の樹脂組成物について詳細に説明する。
本発明に係る樹脂組成物は、ポリＬ−乳酸と、結晶化促進剤と、柔軟性付与剤と、相溶化剤と、ＰＶＡ繊維等のポリ乳酸の融点（１８０℃以上）で安定でありかつ生分解性のある化学合成繊維とを含むことを特徴としている。
本発明に含まれるポリＬ−乳酸としては、特に限定されないが、９０％発酵乳酸とデンプンの混合物中に重合触媒を添加し、脱水重合を行ったものを使用するか、市販のポリ乳酸（三井化学（株）製 レイシアＨ−１００Ｊなど）または耐熱性のナノコンポジット充填剤入りのポリ乳酸など、いずれを用いてもよい。
Hereinafter, the resin composition of the present invention will be described in detail.
The resin composition according to the present invention is stable at the melting point (180 ° C. or higher) of polylactic acid such as poly L-lactic acid, crystallization accelerator, flexibility imparting agent, compatibilizing agent, and PVA fiber, and It is characterized by containing chemically synthetic fibers with biodegradability.
The poly-L-lactic acid included in the present invention is not particularly limited, but a poly-L-lactic acid obtained by adding a polymerization catalyst to a mixture of 90% fermented lactic acid and starch and performing dehydration polymerization, or commercially available polylactic acid (Mitsui (Chemical Co., Ltd., Lacia H-100J, etc.) or polylactic acid with a heat-resistant nanocomposite filler may be used.
本発明に含まれる結晶化促進剤としては、特に限定されないが、ポリ−Ｄ乳酸またはＤ−乳酸−デンプン共重合樹脂からなるＡ成分と、融点または軟化点がポリ乳酸の融点または軟化点以下である生分解樹脂からなるＢ成分とのブロック重合体であり、ブロック共重合方式は、特に限定されないが、Ａ−Ｂ型、Ａ−Ｂ−Ａ型、Ｂ−Ａ−Ｂ型のいずれを用いてもよい。
本発明に用いられる結晶化促進剤のＢ成分である、融点または軟化点がポリ乳酸の融点または軟化点以下の生分解樹脂としては、特に限定されないが、市販のポリカプロラクトン、カプロラクトン・ブチレンサクシレート、ポリブチレンアジペート・テレフタレート、ポリブチレンサクシネート、ポリブチレンサクシネートアジペート変性樹脂、ポリブチレンサクシネートカーボネート変性樹脂、ポリエチレンテレフタレートサクシネート、ポリエチレンサクシネート、ポリヒドロキシブチレートなどが挙げられ、いずれを用いても良い。
本発明に用いられる結晶化促進剤の分子量は、１，０００〜２，０００，０００の範囲が好ましい。１，０００未満の場合、共晶を形成し、結晶加速度は大となるが，樹脂が蜂蜜状で取り扱いにくくなることがあり、２，０００，０００を超えると溶融粘度が大となり、重合終了時に取出しにくくなることがある。
本発明に用いられる結晶化促進剤を樹脂組成物に用いる際の添加量は、特に限定されないが、ベース樹脂１００重量部に対し、１〜１００重量部が好ましい。１重量部未満の場合、顕著な結晶化促進効果が得られず、樹脂組成物の耐熱性が向上しない。１００重量部を超えて添加すると、耐熱性は改善されるものの、現状では、樹脂のコストが大となることがある。
Although it does not specifically limit as a crystallization accelerator contained in this invention, A component which consists of poly-D lactic acid or D-lactic acid-starch copolymer resin, and melting | fusing point or a softening point is below the melting point or softening point of polylactic acid. It is a block polymer with a B component made of a certain biodegradable resin, and the block copolymerization method is not particularly limited, but any of AB type, ABA type, and BAB type can be used. Also good.
The biodegradable resin having a melting point or softening point equal to or lower than the melting point or softening point of polylactic acid, which is the B component of the crystallization accelerator used in the present invention, is not particularly limited. , Polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate modified resin, polybutylene succinate carbonate modified resin, polyethylene terephthalate succinate, polyethylene succinate, polyhydroxybutyrate, etc. Also good.
The molecular weight of the crystallization accelerator used in the present invention is preferably in the range of 1,000 to 2,000,000. If it is less than 1,000, a eutectic is formed and the crystal acceleration becomes large, but the resin may be honey-like and difficult to handle, and if it exceeds 2,000,000, the melt viscosity becomes large and at the end of polymerization. It may be difficult to remove.
Although the addition amount at the time of using the crystallization promoter used for this invention for a resin composition is not specifically limited, 1-100 weight part is preferable with respect to 100 weight part of base resins. When the amount is less than 1 part by weight, a remarkable crystallization promoting effect cannot be obtained, and the heat resistance of the resin composition is not improved. If the amount exceeds 100 parts by weight, the heat resistance is improved, but at present, the cost of the resin may increase.
本発明に用いられる柔軟性付与剤としては、特に限定されないが、市販のポリカプロラクトン、カプロラクトン・ブチレンサクシレート、ポリブチレンアジペート・テレフタレート、ポリブチレンサクシネート、ポリブチレンサクシネートアジペート変性樹脂、ポリブチレンサクシネートカーボネート変性樹脂、ポリエチレンテレフタレートサクシネート、ポリエチレンサクシネート、ポリヒドロキシブチレートなど、融点または軟化点がポリ乳酸の融点または軟化点以下の生分解樹脂であれば、いずれを用いても良い。
また柔軟性付与剤は、樹脂組成物の用途目的に応じて適宜添加量を選択することができる。
柔軟性付与剤の添加量は、特に限定されないが、ポリ乳酸１００重量部に対し、１〜１００重量部が好ましい。１重量部未満の場合、顕著なポリ乳酸の耐衝撃性改善効果がないことがある。１００重量部を超えて添加すると、樹脂組成物中の海島構造が逆転し耐衝撃性は改善されるものの、耐熱性が低下することがある。
The flexibility-imparting agent used in the present invention is not particularly limited, but commercially available polycaprolactone, caprolactone butylene succinate, polybutylene adipate terephthalate, polybutylene succinate, polybutylene succinate adipate-modified resin, polybutylene succinate Any of biodegradable resins having a melting point or softening point below the melting point or softening point of polylactic acid, such as a nitrate carbonate-modified resin, polyethylene terephthalate succinate, polyethylene succinate, and polyhydroxybutyrate may be used.
Further, the amount of the flexibility-imparting agent can be appropriately selected according to the purpose of use of the resin composition.
Although the addition amount of a softness | flexibility imparting agent is not specifically limited, 1-100 weight part is preferable with respect to 100 weight part of polylactic acid. When the amount is less than 1 part by weight, there may be no significant effect of improving the impact resistance of polylactic acid. If the amount exceeds 100 parts by weight, the sea-island structure in the resin composition is reversed and the impact resistance is improved, but the heat resistance may be lowered.
本発明に用いられる相溶化剤としては、特に限定されないが、Ｄ−またはＬ−ポリ乳酸、Ｄ−またはＬ−乳酸−デンプン共重合樹脂とポリカプロラクトン、ポリブチレンアジペート・テレフタレート、ポリブチレンサクシネートアジペート変性樹脂など、融点または軟化点がポリ乳酸の融点または軟化点以下の生分解樹脂をブロック共重合させたものが好ましい。共重合の手法は、樹脂どうしを減圧条件下で加熱溶融する脱水縮合反応や、２個以上のイソシアネート基やエポキシ基をもつ化合物を用いる架橋反応などが用いられる。
相溶化剤の添加量は、特に限定されないが、ポリ乳酸１００重量部に対し１〜３０重量部が好ましい。１重量部未満の場合、顕著なポリ乳酸の対衝撃性改善効果がないことがある。３０重量部を超えて添加しても、耐衝撃性の改善効果は頭打ちとなることがある。また、引張強度と耐熱性が低下することもある。
The compatibilizing agent used in the present invention is not particularly limited, but D- or L-polylactic acid, D- or L-lactic acid-starch copolymer resin and polycaprolactone, polybutylene adipate terephthalate, polybutylene succinate adipate A modified resin such as a block copolymer of a biodegradable resin having a melting point or softening point below the melting point or softening point of polylactic acid is preferred. As a copolymerization method, a dehydration condensation reaction in which resins are heated and melted under reduced pressure conditions, a crosslinking reaction using a compound having two or more isocyanate groups or epoxy groups, and the like are used.
Although the addition amount of a compatibilizing agent is not specifically limited, 1-30 weight part is preferable with respect to 100 weight part of polylactic acid. When the amount is less than 1 part by weight, there may be no significant effect of improving the impact resistance of polylactic acid. Even if it is added in an amount exceeding 30 parts by weight, the effect of improving the impact resistance may reach its peak. In addition, the tensile strength and heat resistance may be reduced.
本発明に用いられる、ポリ乳酸の融点（１８０℃以上）で安定でありかつ生分解性のある化学合成繊維、特に限定されないが、ＰＶＡや４ナイロンが挙げられる。ＰＶＡ繊維としては、特に限定されないが、市販のポリビニルアルコール繊維であればいずれを用いてもよく、成形品の耐湿性向上のためには部分ケン化品またはアルデヒド処理品が好ましい。また、繊維長ならびに繊維径も特に限定されないが、長さ２０ｍｍ未満のものが樹脂と均一混合しやすく好ましい。
ＰＶＡ繊維の添加量は、特に限定されないが、１〜１００重量部が好ましい。１重量部未満の場合、著しい耐熱性・耐衝撃性改善効果がなく、１００重量部を超えて添加すると、樹脂の流動性が悪くなることがある。
なお、化学合成繊維には、炭素繊維やアラミド繊維もあるが、生分解性がない。
A chemically synthesized fiber that is stable at the melting point of polylactic acid (180 ° C. or higher) and biodegradable and is not particularly limited, and includes PVA and 4 nylon. The PVA fiber is not particularly limited, and any commercially available polyvinyl alcohol fiber may be used. A partially saponified product or an aldehyde-treated product is preferable for improving the moisture resistance of the molded product. Further, the fiber length and fiber diameter are not particularly limited, but those having a length of less than 20 mm are preferable because they can be easily mixed with the resin.
Although the addition amount of PVA fiber is not specifically limited, 1-100 weight part is preferable. When the amount is less than 1 part by weight, there is no significant effect of improving heat resistance and impact resistance, and when the amount exceeds 100 parts by weight, the fluidity of the resin may deteriorate.
Chemically synthesized fibers include carbon fibers and aramid fibers, but are not biodegradable.
本発明の樹脂組成物には、必要に応じて架橋剤を添加してもよい。
本発明に用いられる架橋剤としては、特に限定されないが、ポリ乳酸の融点で蒸発しないものであれば、エポキシ系、シラン系、イソシアネート系など、いずれを用いてもよい。
架橋剤の添加量は、特に限定されないが、ポリ乳酸１００重量部に対し０．０１〜１０重量部が好ましい。０．０１重量部未満の場合、顕著なポリ乳酸の耐衝撃性改善効果がなく、１０重量部を超えて添加するとかえって耐熱性・耐衝撃性が低下することがある。
You may add a crosslinking agent to the resin composition of this invention as needed.
The cross-linking agent used in the present invention is not particularly limited, and any epoxy-based, silane-based, or isocyanate-based one may be used as long as it does not evaporate at the melting point of polylactic acid.
Although the addition amount of a crosslinking agent is not specifically limited, 0.01-10 weight part is preferable with respect to 100 weight part of polylactic acid. When the amount is less than 0.01 part by weight, there is no remarkable effect of improving the impact resistance of polylactic acid, and when the amount exceeds 10 parts by weight, the heat resistance and impact resistance may be lowered.
以下本発明を実施例によって詳細に説明するが、本発明はこれらに限定されるものではない。
実施例１
ａ．ポリ乳酸、結晶化促進剤、相溶化剤、ポリビニルアルコール繊維、柔軟性付与剤、架橋剤の混合
ポリＬ−乳酸（三井化学（株）製 レイシアＨ−１００Ｊ） １００重量部、Ｄ−乳酸−０．１ｗ％−デンプン共重合樹脂（結晶化促進剤） ５重量部、ポリＬ−乳酸−ポリブチレンサクシネートブロック共重合樹脂（相溶化剤） ２０重量部、ポリビニルアルコール繊維（（株）クラレ製 ビニロンＲＭ−Ｓ１８２×６）（ＰＶＡ繊維１） ３０重量部、ポリカプロラクトン（柔軟性付与剤）（ダイセル化学工業（株）製 プラクセル Ｈ−７） １０重量部、架橋剤（旭化成ケミカルズ（株）製 デュラネートＰ３０１−７５Ｅ） ０．５重量部の各ペレットをそれぞれ計量後、ＰＥ製の袋の中で予備混合したのち、（株）クリモト製ＳＩＫＲニーダを用いて混練し、ストランド状に押し出し、コンベア上で冷却後、ペレット化した。
EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
Example 1
a. Mixing of polylactic acid, crystallization accelerator, compatibilizer, polyvinyl alcohol fiber, flexibility imparting agent, and crosslinking agent Poly L-lactic acid (Lacia H-100J, Mitsui Chemicals, Inc.) 100 parts by weight, D-lactic acid-0 .1w% -starch copolymer resin (crystallization accelerator) 5 parts by weight, poly L-lactic acid-polybutylene succinate block copolymer resin (compatibilizer) 20 parts by weight, polyvinyl alcohol fiber (Kuraray Co., Ltd. vinylon) RM-S182 × 6) (PVA fiber 1) 30 parts by weight, polycaprolactone (flexibility-imparting agent) (Dacel Chemical Industries, Ltd. Placcel H-7) 10 parts by weight, cross-linking agent (Asahi Kasei Chemicals Co., Ltd. Duranate) P301-75E) After weighing 0.5 parts by weight of each pellet, premixed in PE bags, and then used SIKR kneader manufactured by Kurimoto Co., Ltd. Kneaded, extruded into strands, cooled on a conveyor and pelletized.
ｂ．混合樹脂の射出形成
ａで作成した混合ペレットを（株）山城精機製作所製 ＳＡＶ−３０を用いて、荷重たわみ測定用の棒状試験片（１２０ｍｍ×１２ｍｍ×４ｍｍ）を成形した。成形温度はスクリュウ上部、スクリュウ下部、ノズルの順番に、それぞれ１７０℃、１７５℃、１８０℃に設定した。また、金型温度（設定温度１２０℃で可動板側実測値）１１０℃、冷却時間１２０秒で実験を行った。
得られた試験片はＪＩＳ Ｋ７１９１−２に準拠して熱変形温度を測定した。また、ＪＩＳ Ｋ７１１０に準拠してＩｚｏｄ衝撃強度を測定した。結果を表１に示す。
b. Injection molding of mixed resin A rod-shaped test piece (120 mm × 12 mm × 4 mm) for load deflection measurement was molded from the mixed pellet prepared in a using SAV-30 manufactured by Yamashiro Seiki Seisakusho. The molding temperature was set to 170 ° C., 175 ° C., and 180 ° C. in the order of the upper part of the screw, the lower part of the screw, and the nozzle. The experiment was performed at a mold temperature (measured value on the movable plate side at a set temperature of 120 ° C.) of 110 ° C. and a cooling time of 120 seconds.
The obtained test piece was measured for heat distortion temperature according to JIS K7191-2. Further, the Izod impact strength was measured in accordance with JIS K7110. The results are shown in Table 1.
実施例２
架橋剤を使用せず、ＰＶＡ繊維１を（株）クラレ製 ビニロンＲＭ−Ｓ１８２×６を０．５ｗ％デュラネートで表面処理した ＰＶＡ繊維２ ３０重量部に変更した以外は実施例１と同様にして試験片を作成したのち、同様に熱変形温度と衝撃強度とを測定した。
結果を表１に表す。
Example 2
The same procedure as in Example 1 was conducted except that PVA fiber 1 was changed to 30 parts by weight of PVA fiber 1 whose surface was treated with 0.5 w% duranate from Kuraray Co., Ltd. vinylon RM-S182 × 6 without using a crosslinking agent. After preparing the test piece, the heat distortion temperature and the impact strength were measured in the same manner.
The results are shown in Table 1.
比較例１
ポリＬ−乳酸 １００重量部のみを用い、また、金型温度を３０℃にした以外は実施例１〜４と同様にして試験片を作成し、同様に熱変形温度と衝撃強度とを測定した。
結果を表１に表す。
Comparative Example 1
A test piece was prepared in the same manner as in Examples 1 to 4 except that only 100 parts by weight of poly-L-lactic acid was used and the mold temperature was 30 ° C., and the heat distortion temperature and impact strength were measured in the same manner. .
The results are shown in Table 1.
比較例２
組成を以下のようにした以外は実施例１、２と同様にして試験片を作成し、同様に熱変形温度と衝撃強度とを測定した。
ポリＬ−乳酸 １００重量部
Ｄ−乳酸−０．１ｗ％−デンプン共重合樹脂 ５重量部
結果を表１に表す。
Comparative Example 2
A test piece was prepared in the same manner as in Examples 1 and 2 except that the composition was as follows, and the heat distortion temperature and impact strength were measured in the same manner.
Poly L-lactic acid 100 parts by weight D-lactic acid-0.1 w% -starch copolymer resin 5 parts by weight The results are shown in Table 1.
比較例３
組成を以下のようにした以外は実施例１、２と同様にして試験片を作成し、同様に熱変形温度と衝撃強度とを測定した。
ポリＬ−乳酸 １００重量部
Ｄ−乳酸−０．１ｗ％−デンプン共重合樹脂 ５重量部
ポリＬ−乳酸−ポリブチレンサクシネートブロック共重合樹脂 ２０重量部
結果を表１に表す。
Comparative Example 3
A test piece was prepared in the same manner as in Examples 1 and 2 except that the composition was as follows, and the heat distortion temperature and impact strength were measured in the same manner.
Poly L-lactic acid 100 parts by weight D-lactic acid-0.1 w% -starch copolymer resin 5 parts by weight Poly L-lactic acid-polybutylene succinate block copolymer resin 20 parts by weight The results are shown in Table 1.
比較例４
組成を以下のようにした以外は実施例１、２と同様にして試験片を作成し、同様に熱変形温度と衝撃強度とを測定した。
ポリＬ−乳酸 １００重量部
Ｄ−乳酸−０．１ｗ％−デンプン共重合樹脂 ５重量部
ポリＬ−乳酸−ポリブチレンサクシネートブロック共重合樹脂 ２０重量部
ポリカプロラクトン ５重量部
結果を表１に表す。
Comparative Example 4
A test piece was prepared in the same manner as in Examples 1 and 2 except that the composition was as follows, and the heat distortion temperature and impact strength were measured in the same manner.
Poly L-lactic acid 100 parts by weight D-lactic acid-0.1 w% -starch copolymer resin 5 parts by weight Poly L-lactic acid-polybutylene succinate block copolymer resin 20 parts by weight Polycaprolactone 5 parts by weight The results are shown in Table 1. .
比較例５
組成を以下のようにした以外は実施例１、２と同様にして試験片を作成し、同様に熱変形温度と衝撃強度とを測定した。
ポリＬ−乳酸 １００重量部
Ｄ−乳酸−０．１ｗ％−デンプン共重合樹脂 ５重量部
ポリＬ−乳酸−ポリブチレンサクシネートブロック共重合樹脂 ２０重量部
ポリカプロラクトン １０重量部
結果を表１に表す。
Comparative Example 5
A test piece was prepared in the same manner as in Examples 1 and 2 except that the composition was as follows, and the heat distortion temperature and impact strength were measured in the same manner.
Poly L-lactic acid 100 parts by weight D-lactic acid-0.1 w% -starch copolymer resin 5 parts by weight Poly L-lactic acid-polybutylene succinate block copolymer resin 20 parts by weight Polycaprolactone 10 parts by weight The results are shown in Table 1. .
表１から明らかなように、本発明に係る実施例１〜２は耐熱性・耐衝撃性に優れている。 As is clear from Table 1, Examples 1 and 2 according to the present invention are excellent in heat resistance and impact resistance.
比較例６〜８
ＰＶＡ繊維に代えて麻繊維を用いた比較例を下記表２に示す。
Comparative Examples 6-8
A comparative example using hemp fibers instead of PVA fibers is shown in Table 2 below.
表２から明らかなように、ＰＶＡ繊維に代えて麻繊維を用いた場合には、物性、特に衝撃強度が不十分であった。即ち、単に繊維を添加しただけでは、物性は不十分であった。 As is apparent from Table 2, when hemp fibers were used instead of PVA fibers, physical properties, particularly impact strength, were insufficient. That is, the physical properties were insufficient by simply adding fibers.
本発明の樹脂組成物から得られる成形品は、自動車部品、家電製品、一般産業資材として使用できる。 Molded articles obtained from the resin composition of the present invention can be used as automobile parts, home appliances, and general industrial materials.
Claims (5)
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| JP2008189812A (en) * | 2007-02-05 | 2008-08-21 | Nishikawa Rubber Co Ltd | Crystallization accelerator for polylactic acid and method for its preparation |
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