JP2004211099A - Biodegradable molded article - Google Patents

Biodegradable molded article Download PDF

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JP2004211099A
JP2004211099A JP2004045811A JP2004045811A JP2004211099A JP 2004211099 A JP2004211099 A JP 2004211099A JP 2004045811 A JP2004045811 A JP 2004045811A JP 2004045811 A JP2004045811 A JP 2004045811A JP 2004211099 A JP2004211099 A JP 2004211099A
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molded article
polyester resin
biodegradable molded
weight
biodegradable
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Takayuki Kuroda
隆之 黒田
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Daicel Corp
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Daicel Chemical Industries Ltd
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Priority to JP2004045811A priority Critical patent/JP2004211099A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biodegradable molded article with excellent biodegradability, weatherability and mechanical strength. <P>SOLUTION: The biodegradable molded article is composed of 100 pts.wt. aliphatic polyester resin and 1-200 pts.wt. polycaprolactone, and further inorganic substances such as calcium carbonate, magnesium carbonate, talc and silica, and/or a pigment such as carbon black. The biodegradable molded article can be degraded in natural environmental conditions unable to recover after use without causing troubles such as environmental pollution. Thus, the biodegradable molded article can be applied in various uses. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

本発明は、脂肪族ポリエステル樹脂とポリカプロラクトンとの樹脂組成物に無機物および／または顔料を配合したポリエステル樹脂組成物からなる生分解性に優れる成形体であって、機械強度特性、耐候性に優れる生分解性成形体に関する。   The present invention is a molded article having excellent biodegradability, comprising a polyester resin composition obtained by blending an inorganic substance and / or a pigment with a resin composition of an aliphatic polyester resin and polycaprolactone, and having excellent mechanical strength properties and weather resistance. The present invention relates to a biodegradable molded article.

従来より、ボトル、トレイ、ポット等の日用品の成形材料として、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート等に代表される芳香族ポリエステルやポリアミド等の汎用プラスチック材料が大量に使われ、消費されている。   BACKGROUND ART Conventionally, general-purpose plastic materials such as aromatic polyesters and polyamides represented by polyethylene, polypropylene, polyethylene terephthalate and the like have been used and consumed as molding materials for daily necessities such as bottles, trays and pots.

これらはリサイクルされる物もあるが、一般に回収された後、焼却処理や土中埋設処理等の処理を受ける。しかし回収に多大な労力や費用を要するため、あるいは回収が困難であるため、回収されずに放置される場合がある。特に上記のポリエチレン等のポリマーには全くといってよいほど生分解性が無く、放置された状態で半永久的に残存し、環境保全の点で問題が生じる。
また回収した成形体を焼却処理する場合には、高カロリーの燃焼熱が発生し、あるいは腐食性のガスの発生を伴い焼却炉を損傷するおそれもある。
さらに、土中埋設処理を行った場合、成形体が難分解性であれば土中に半永久的に残留することになる。 Although some of these are recycled, they are generally collected and then subjected to incineration and burial in soil. However, collection may require a great deal of labor and cost, or may be difficult to collect, and may be left uncollected. In particular, the above-mentioned polymers such as polyethylene have almost no biodegradability, remain semi-permanently when left as they are, and pose a problem in terms of environmental conservation.
In addition, when the collected compact is incinerated, high calorie combustion heat may be generated or corrosive gas may be generated to damage the incinerator.
Furthermore, when the underground treatment is performed, if the molded body is hardly decomposable, it will remain semi-permanently in the soil.

近年、このようなポリエチレン等の難分解性あるいは不分解性の樹脂に生分解性を付与すべく、例えば澱粉などの生分解性を有する成分をポリエチレン樹脂等に混和する方法が検討されている。また、ポリエチレン樹脂等に光分解性を付与する方法、あるいは光分解性を付与したポリエチレン樹脂等と澱粉等の生分解性を有する成分とを混和する方法なども検討されている。   In recent years, in order to impart biodegradability to such a hardly decomposable or non-degradable resin such as polyethylene, a method of mixing a biodegradable component such as starch with a polyethylene resin or the like has been studied. Also, a method of imparting photodegradability to a polyethylene resin or the like, or a method of mixing a photodegradable polyethylene resin or the like with a biodegradable component such as starch has been studied.

しかし、澱粉等の生分解性を有する成分を混和する方法は、成形体の機械強度が低下し、場合によっては成形体の形状が保持できない。しかも、混和された澱粉はそれ自体分解性を有するが、その分解過程において澱粉以外のポリマー部分の分解を誘引せず、結局は成形体はバラバラにはなるが、単に細かく切断されるにすぎず本質的な問題の解決とはならない。
これは光分解性の付与についても同様のことがいえ、光によって重合度の低下を引き起こすが生分解性を有するわけではなく、さらに光が当たらない環境下では意味がない。 However, in the method of mixing a biodegradable component such as starch, the mechanical strength of the molded body is reduced, and in some cases, the shape of the molded body cannot be maintained. Moreover, the blended starch itself has degradability, but does not induce the degradation of the polymer portion other than the starch in the degradation process, and eventually the molded product is broken apart but is merely cut finely. It does not solve the essential problem.
The same applies to the provision of photodegradability. Light causes a decrease in the degree of polymerization, but does not have biodegradability, and is meaningless in an environment where no light is applied.

一方、このような本質的に生分解性でない樹脂に代わり、それ自体が生分解性を有する樹脂が第二世代の生分解性樹脂として開発され、これに該当するものに化学合成で得られる脂肪族ポリエステル樹脂がある。   On the other hand, instead of such an essentially non-biodegradable resin, a resin that is itself biodegradable has been developed as a second-generation biodegradable resin. There is a group polyester resin.

しかし脂肪族ポリエステル樹脂は、重縮合で高分子化する場合、製造工程の後半で高温高減圧の厳しい条件下で反応が行われる。このため元来熱安定性のよくないポリエステル樹脂の解重合が生じ、高分子量化にするのは困難である。従って得られた成形体の機械強度特性が不十分となり、広い用途展開を期待するに足る強度の確保が困難となる。
かかる場合、比較的低分子量の脂肪族ポリエステルの両末端水酸基に、ジイソシアネートを反応させ、ウレタン結合を介して高分子量化する方法がある。高分子量化により高い機械強度特性を確保し得るが、その一方、得られた成形体等の分解が遅くなる場合がある。
このような状況から、本質的に生分解性を有し、かつ機械強度特性と耐候性とを有し、かつ優れた生分解性を有する成形体の要求が高まっている。 However, when an aliphatic polyester resin is polymerized by polycondensation, the reaction is performed in the latter half of the production process under severe conditions of high temperature and high pressure. For this reason, depolymerization of the polyester resin, which originally has poor thermal stability, occurs, and it is difficult to increase the molecular weight. Therefore, the mechanical strength characteristics of the obtained molded body become insufficient, and it is difficult to secure the strength enough to expect a wide range of applications.
In such a case, there is a method in which hydroxyl groups at both ends of a relatively low molecular weight aliphatic polyester are reacted with diisocyanate to increase the molecular weight through a urethane bond. Although high mechanical strength characteristics can be ensured by increasing the molecular weight, on the other hand, decomposition of the obtained molded article or the like may be delayed.
Under such circumstances, there is an increasing demand for a molded article that is essentially biodegradable, has mechanical strength characteristics and weather resistance, and has excellent biodegradability.

本発明者は、脂肪族ポリエステル樹脂からなる組成物について鋭意研究を重ねた結果、ポリカプロラクトン、および無機物および／または顔料を所定量配合した樹脂組成物からなる成形体が、従来の用途に何等問題なく代替し得る機械強度特性や耐候性を有し、かつ、ポリカプロラクトンの配合が脂肪族ポリエステル樹脂の生分解を誘引することにより、高い生分解性を示す成形体となることを見い出し、本発明を完成するに至った。   The present inventor has conducted intensive studies on a composition comprising an aliphatic polyester resin. As a result, a molded article comprising a resin composition containing a predetermined amount of polycaprolactone and an inorganic substance and / or a pigment has no problem in conventional use. The present invention has found that a molded article having high biodegradability can be obtained by having a mechanical strength characteristic and weather resistance that can be substituted without any problem, and by inducing the biodegradation of the aliphatic polyester resin by blending polycaprolactone. Was completed.

すなわち本発明は、脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン１乃至２００重量部を配合し、さらに、無機物および／または顔料を配合したポリエステル樹脂組成物からなる生分解性形体を提供するものである。また、脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン１乃至２００重量部を配合したポリエステル樹脂組成物を２０重量％以上含有する上記発明１に記載の生分解性成形体を提供するものである。
さらに、本発明は、無機物が炭酸カルシウム、炭酸マグネシウム、タルク、シリカから選ばれる少なくとも１種である上記発明１に記載の生分解性成形体を提供するものである。さらにまた、本発明は、顔料がカーボンブラックである上記発明１に記載の生分解性成形体を提供するものである。以下、本発明を詳細に説明する。 That is, the present invention provides a biodegradable form comprising a polyester resin composition containing 1 to 200 parts by weight of polycaprolactone and 100 parts by weight of an aliphatic polyester resin and further containing an inorganic substance and / or a pigment. is there. Further, the present invention provides the biodegradable molded article according to the first aspect of the present invention, which contains 20% by weight or more of a polyester resin composition containing 1 to 200 parts by weight of polycaprolactone per 100 parts by weight of an aliphatic polyester resin.
Further, the present invention provides the biodegradable molded article according to the above invention 1, wherein the inorganic substance is at least one selected from calcium carbonate, magnesium carbonate, talc, and silica. Furthermore, the present invention provides the biodegradable molded article according to the first aspect, wherein the pigment is carbon black. Hereinafter, the present invention will be described in detail.

本発明の生分解性成形体は、優れた生分解性を有すると共に優れた耐候性、機械強度も有している。生分解性を有しているので、使用後回収不可能な用途に用いても自然環境下で分解し、環境公害等の問題を引き起こすことがない。このため、種々の生分解性成形体の用途に広く応用することができる。   The biodegradable molded article of the present invention has not only excellent biodegradability but also excellent weather resistance and mechanical strength. Since it is biodegradable, it is decomposed in the natural environment even when used for applications that cannot be recovered after use, and does not cause problems such as environmental pollution. Therefore, it can be widely applied to various uses of biodegradable molded articles.

本発明で使用するポリエステル樹脂組成物は、脂肪族ポリエステル樹脂とポリカプロラクトンとの樹脂組成物に無機物および／または顔料を配合した組成物からなる。
脂肪族ポリエステル樹脂としては、コハク酸と１，４−ブタンジオールとから得られるポリエステル樹脂、コハク酸とエチレングリコールとから得られるポリエステル樹脂、シュウ酸とネオペンチルグリコールとから得られるポリエステル樹脂、シュウ酸と１，４−ブタンジオールとから得られるポリエステル樹脂、シュウ酸とエチレングリコールから得られるポリエステル樹脂等が例示できるが、融点が高く、好ましいのはコハク酸と１，４−ブタンジオールとから得られるポリエステル樹脂である。 The polyester resin composition used in the present invention comprises a resin composition of an aliphatic polyester resin and polycaprolactone mixed with an inorganic substance and / or a pigment.
Examples of the aliphatic polyester resin include a polyester resin obtained from succinic acid and 1,4-butanediol, a polyester resin obtained from succinic acid and ethylene glycol, a polyester resin obtained from oxalic acid and neopentyl glycol, and oxalic acid. And polyester resin obtained from oxalic acid and ethylene glycol, and the like, but the melting point is high, and preferable is obtained from succinic acid and 1,4-butanediol. It is a polyester resin.

脂肪族ポリエステル樹脂の好ましい数平均分子量は、３０，０００乃至１，０００，０００の範囲、より好ましくは５０，０００乃至２００，０００の範囲である。平均分子量が３０，０００以下では機械特性が不足し、１，０００，０００以上では生分解性成形体の製造工程で溶融粘度が高すぎ、押し出しが困難になる等の問題を生ずる場合がある。   The preferred number average molecular weight of the aliphatic polyester resin is in the range of 30,000 to 1,000,000, more preferably in the range of 50,000 to 200,000. If the average molecular weight is less than 30,000, the mechanical properties are insufficient, and if it is more than 1,000,000, the melt viscosity is too high in the production process of the biodegradable molded product, which may cause problems such as difficulty in extrusion.

本発明で使用するポリカプロラクトンは、アルコール等の活性水素を有する化合物を開始剤とし、ε−カプロラクトンを常法の開環重合で得たものを使用することができる。前記開始剤の官能数は特に制限はなく、２官能や３官能のものが好ましく使用できる。
ポリカプロラクトンの数平均分子量は、好ましくは１，０００乃至２００，０００の範囲、特に好ましくは５，０００乃至１００，０００の範囲である。
尚、２００，０００よりも大きい数平均分子量のポリカプロラクトンも本発明において問題なく使用することができるが、このような非常に分子量の高いポリカプロラクトンを得ることは一般に困難で現実的ではない。
また、使用するポリカプロラクトンは、ε−カプロラクトンの単重合体以外に、バレロラクトンやグリコリド、ラクチド等のコモノマーを使用した共重合体も使用可能である。 As the polycaprolactone used in the present invention, those obtained by using a compound having active hydrogen such as alcohol as an initiator and obtaining ε-caprolactone by a conventional ring-opening polymerization can be used. The functional number of the initiator is not particularly limited, and bifunctional or trifunctional ones can be preferably used.
The number average molecular weight of the polycaprolactone is preferably in the range from 1,000 to 200,000, particularly preferably in the range from 5,000 to 100,000.
Although polycaprolactone having a number average molecular weight of more than 200,000 can be used without any problem in the present invention, it is generally difficult and impractical to obtain such a very high molecular weight polycaprolactone.
As the polycaprolactone to be used, a copolymer using a comonomer such as valerolactone, glycolide, or lactide can be used in addition to the homopolymer of ε-caprolactone.

本発明で使用するポリエステル樹脂組成物は、脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン１乃至２００重量部を混合したものであることが好ましく、より好ましくは脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン４乃至５５重量部を混合したものであり、さらに、必須成分として無機物および／または顔料が混合される。この範囲で混合することにより生分解性に優れ、かつ機械強度特性および耐候性に優れる生分解性成形体を得ることができる。   The polyester resin composition used in the present invention is preferably a mixture of 1 to 200 parts by weight of polycaprolactone with respect to 100 parts by weight of the aliphatic polyester resin, and more preferably 100 parts by weight of the aliphatic polyester resin. It is a mixture of 4 to 55 parts by weight of caprolactone, and further contains an inorganic substance and / or a pigment as an essential component. By mixing in this range, a biodegradable molded article having excellent biodegradability and excellent mechanical strength characteristics and weather resistance can be obtained.

本発明の無機物および／または顔料を含む生分解性成形体には、必要に応じて他の生分解性樹脂成分を混合することもできる。上記した脂肪族ポリエステル樹脂とポリカプロラクトンからなるポリエステル樹脂組成物と他の生分解性樹脂成分との配合割合は、得られる樹脂組成物（他の生分解性樹脂成分と脂肪族ポリエステル樹脂とポリカプロラクトンからなる上記ポリエステル樹脂組成物との合計は１００重量％）に対しポリエステル樹脂組成物が２０重量％以上であることが好ましく、特に好ましくは３０重量％以上である。
本発明で混合して用いることができる他の生分解性樹脂成分としては、ポリビニルアルコール系の樹脂、３−ヒドロキシブチレートと３−ヒドロキシバリレートの共重合体系の樹脂等を例示することができる。
本発明で必須成分として混合して用いる無機物としては、炭酸カルシウム、炭酸マグネシウム、タルク、シリカ等を例示することができる。
また、顔料としては、カーボンブラック等を例示することができる。
その他、上記範囲で低分子量ポリカプロラクトンの様なポリエステルを、可塑剤として添加することができ、艶消し剤、酸化防止剤（例えばヒンダードフェノール化合物、ヒンダードアミン化合物、リン系化合物等）、紫外線吸収剤（例えば、ベンゾフェノール化合物、ベンゾトリアゾール化合物、サリシレート化合物等）、また場合によっては架橋性基を有する化合物を含ませることもできる。 If necessary, other biodegradable resin components can be mixed with the biodegradable molded article containing the inorganic substance and / or the pigment of the present invention. The mixing ratio of the polyester resin composition comprising the aliphatic polyester resin and polycaprolactone and the other biodegradable resin component is determined according to the obtained resin composition (other biodegradable resin component, aliphatic polyester resin and polycaprolactone). Is preferably 20% by weight or more, particularly preferably 30% by weight or more, based on 100% by weight of the above-mentioned polyester resin composition.
Examples of other biodegradable resin components that can be mixed and used in the present invention include a polyvinyl alcohol resin, a copolymer resin of 3-hydroxybutyrate and 3-hydroxyvalerate, and the like. .
Examples of the inorganic substance used as a mixture as an essential component in the present invention include calcium carbonate, magnesium carbonate, talc, silica and the like.
Examples of the pigment include carbon black.
In addition, polyesters such as low molecular weight polycaprolactone in the above range can be added as a plasticizer, matting agents, antioxidants (eg, hindered phenol compounds, hindered amine compounds, phosphorus compounds, etc.), ultraviolet absorbers (For example, a benzophenol compound, a benzotriazole compound, a salicylate compound, etc.), and in some cases, a compound having a crosslinkable group.

本発明で使用するポリエステル樹脂組成物は、脂肪族ポリエステル樹脂とポリカプロラクトンおよび無機物および／または顔料を配合して混練することにより得られ、その混練方法としては、２軸押出機等の常法の混練方法が問題なく使用できる。他の成分を配合する場合にも同様に混練により得ることができる。   The polyester resin composition used in the present invention is obtained by blending and kneading an aliphatic polyester resin with polycaprolactone and an inorganic substance and / or a pigment. The kneading method is a conventional method such as a twin screw extruder. The kneading method can be used without any problem. When other components are blended, they can be similarly obtained by kneading.

本発明の生分解性成形体は、上記ポリエステル樹脂組成物を、その樹脂組成物の溶融温度以上で溶融押し出しし、射出成形、ブロー成形、注型加工、真空成形、カレンダー成形、発泡成形等の各種成型方法により製造することができる。   The biodegradable molded article of the present invention, the polyester resin composition, melt extruded at a melting temperature of the resin composition or higher, injection molding, blow molding, casting, vacuum molding, calendar molding, foam molding and the like It can be manufactured by various molding methods.

このような成型方法で得られる生分解性成形体は、その目的により、要求される機械特性は異なるが、その強度は５ＭＰａ以上、伸度は０．５％以上であることが好ましい。伸度が０．５％を下回ると生分解性成形体の物性が劣る場合がある。好ましくは強度１５ＭＰａ以上、伸度１．０％以上である。   The biodegradable molded body obtained by such a molding method has different required mechanical properties depending on the purpose, but preferably has a strength of 5 MPa or more and an elongation of 0.5% or more. If the elongation is less than 0.5%, the physical properties of the biodegradable molded article may be poor. Preferably, the strength is 15 MPa or more and the elongation is 1.0% or more.

本発明の生分解性成形体は、厚さ８００μｍ以下のフィルムおよび繊維を除くものであって、ボトル、トレイ、カップ、苗木用ポット等のポット類、ナイフ、スプーン、フォーク、割り箸、ストロー等の飲食用具、パイプ、芝生の仮止め材、コンテナー、注射器、ドレーンチャンネル等に使用することができるが、これらに限定されるものではない。   The biodegradable molded article of the present invention excludes films and fibers having a thickness of 800 μm or less, and includes bottles, trays, cups, pots such as pots for seedlings, knives, spoons, forks, split chopsticks, straws and the like. It can be used for eating and drinking utensils, pipes, lawn temporary fixing materials, containers, syringes, drain channels, etc., but is not limited thereto.

［実施例］
以下、実施例により本発明を具体的に説明するが、本発明はこれらに限定されるものではない。 [Example]
Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto.

＜実施例１＞
コハク酸と１，４−ブタンジオールとの脂肪族ポリエステル樹脂（数平均分子量７０，０００）１００重量部にポリカプロラクトン（ダイセル化学工業社製「ＰＬＡＣＣＥＬ Ｈ７」）４０重量部を混練し、ポリエステル樹脂組成物を得た。
これを、射出成形機（東芝機械製ＩＳ １００Ｅ：型締め圧１００トン）にて、樹脂温度２００℃、金型温度３０℃、射出圧力７００ｋｇｆ／ｃｍ2、射出速度６０ｃｍ3／ＳＥＣの射出成形条件で、大きさ１２０×６０ｍｍ、深さ１５ｍｍのトレイを作製した。
得られた成形体を土中に埋設し、３か月経過後の外観観察を行った。
また、成形体片を凍結粉砕してＪＩＳ Ｋ６９５０（１９９４）の評価を行った。汚泥には都市下水汚泥を使用した。
さらに、得られた成形体を滅菌水中に浸漬し、３か月経過後の外観観察を行った。結果を表−１に示す。 <Example 1>
100 parts by weight of an aliphatic polyester resin of succinic acid and 1,4-butanediol (number-average molecular weight 70,000) is kneaded with 40 parts by weight of polycaprolactone ("PLACCEL H7" manufactured by Daicel Chemical Industries, Ltd.) to obtain a polyester resin composition. I got something.
Using an injection molding machine (IS 100E, manufactured by Toshiba Machine Co., mold clamping pressure: 100 tons), injection molding conditions of resin temperature 200 ° C., mold temperature 30 ° C., injection pressure 700 kgf / cm 2 , injection speed 60 cm 3 / SEC. Thus, a tray having a size of 120 × 60 mm and a depth of 15 mm was prepared.
The obtained molded body was buried in the soil, and the appearance after three months was observed.
The molded piece was freeze-pulverized and evaluated according to JIS K6950 (1994). Urban sewage sludge was used as sludge.
Further, the obtained molded body was immersed in sterilized water, and the appearance was observed after 3 months. The results are shown in Table 1.

＜実施例２＞
コハク酸と１，４−ブタンジオールとの脂肪族ポリエステル樹脂（数平均分子量７０，０００）１００重量部にポリカプロラクトン（ダイセル化学工業社製「ＰＬＡＣＣＥＬ Ｈ７」）１５重量部を混練し、ポリエステル樹脂組成物を得た。
この樹脂組成物から実施例１と同様にしてトレイを作製した。得られたトレイについて実施例１と同様の試験を行った。 <Example 2>
100 parts by weight of an aliphatic polyester resin of succinic acid and 1,4-butanediol (number-average molecular weight 70,000) is kneaded with 15 parts by weight of polycaprolactone (“PLACCEL H7” manufactured by Daicel Chemical Industries, Ltd.) to obtain a polyester resin composition. I got something.
A tray was prepared from this resin composition in the same manner as in Example 1. The same test as in Example 1 was performed on the obtained tray.

＜実施例３＞
コハク酸と１，４−ブタンジオールとの脂肪族ポリエステル樹脂（数平均分子量７０，０００）１００重量部にポリカプロラクトン（ダイセル化学工業社製「ＰＬＡＣＣＥＬ Ｈ７」）１００重量部を混練し、ポリエステル樹脂組成物を得た。
この樹脂組成物から実施例１と同様にしてトレイを作製した。得られたトレイについて実施例１と同様の試験を行った。 <Example 3>
100 parts by weight of an aliphatic polyester resin of succinic acid and 1,4-butanediol (number average molecular weight 70,000) and 100 parts by weight of polycaprolactone (“PLACCEL H7” manufactured by Daicel Chemical Industries, Ltd.) are kneaded, and the polyester resin composition is obtained. I got something.
A tray was produced from this resin composition in the same manner as in Example 1. The same test as in Example 1 was performed on the obtained tray.

＜比較例１＞
コハク酸と１，４−ブタンジオールとの脂肪族ポリエステル樹脂（数平均分子量７０，０００）を２００℃で溶融押し出し、この樹脂組成物から実施例１と同様にしてトレイを作製した。得られたトレイについて実施例１と同様の試験を行った。 <Comparative Example 1>
An aliphatic polyester resin of succinic acid and 1,4-butanediol (number average molecular weight 70,000) was melt-extruded at 200 ° C., and a tray was prepared from this resin composition in the same manner as in Example 1. The same test as in Example 1 was performed on the obtained tray.

Claims (4)

脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン１乃至２００重量部を配合し、さらに、無機物および／または顔料を配合したポリエステル樹脂組成物からなる生分解性成形体。   A biodegradable molded article comprising a polyester resin composition containing 1 to 200 parts by weight of polycaprolactone and 100 parts by weight of an aliphatic polyester resin, and further containing an inorganic substance and / or a pigment. 脂肪族ポリエステル樹脂１００重量部に対しポリカプロラクトン１乃至２００重量部を配合したポリエステル樹脂組成物を２０重量％以上含有する請求項１に記載の生分解性成形体。   2. The biodegradable molded article according to claim 1, which contains a polyester resin composition in which 1 to 200 parts by weight of polycaprolactone is blended with respect to 100 parts by weight of an aliphatic polyester resin, in an amount of 20% by weight or more. 無機物が炭酸カルシウム、炭酸マグネシウム、タルク、シリカから選ばれる少なくとも１種である請求項１に記載の生分解性成形体。   The biodegradable molded article according to claim 1, wherein the inorganic substance is at least one selected from calcium carbonate, magnesium carbonate, talc, and silica. 顔料がカーボンブラックである請求項１に記載の生分解性成形体。   The biodegradable molded article according to claim 1, wherein the pigment is carbon black.
JP2004045811A 2004-02-23 2004-02-23 Biodegradable molded article Pending JP2004211099A (en)

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