JPH06298236A - Throwaway food container - Google Patents
Throwaway food containerInfo
- Publication number
- JPH06298236A JPH06298236A JP8649193A JP8649193A JPH06298236A JP H06298236 A JPH06298236 A JP H06298236A JP 8649193 A JP8649193 A JP 8649193A JP 8649193 A JP8649193 A JP 8649193A JP H06298236 A JPH06298236 A JP H06298236A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- lactic acid
- food container
- container
- throwaway
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Devices For Warming Or Keeping Food Or Tableware Hot (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は使い捨て食品容器に関す
る。さらに詳しくは、乳酸ポリマーを主体とする熱可塑
性ポリマー組成物からなり自然環境下で分解性を有し、
且つ透明性が優れた食品容器に関するものである。FIELD OF THE INVENTION This invention relates to disposable food containers. More specifically, it is composed of a thermoplastic polymer composition mainly composed of lactic acid polymer and has degradability in a natural environment,
The present invention also relates to a food container having excellent transparency.
【０００２】[0002]
【従来の技術】従来、プラスチック製の食品容器として
はポリエチレン、ポリプロピレン、ポリエチレンテレフ
タレート、ポリ塩化ビニル等の樹脂類が使用されてい
る。しかしこのような樹脂から製造された容器は、透明
性に優れているものもあるが廃棄する際、ゴミの量を増
やすうえに、従来の物は自然環境下での分解速度がきわ
めて遅いため、埋設処理された場合、半永久的に地中に
残留する。また投棄されたプラスチック類により、景観
が損なわれ海洋生物の生活環境が破壊されるなどの問題
が起こっている。2. Description of the Related Art Conventionally, resins such as polyethylene, polypropylene, polyethylene terephthalate and polyvinyl chloride have been used for plastic food containers. However, some containers made from such resins have excellent transparency, but when they are discarded, in addition to increasing the amount of dust, conventional products have a very slow decomposition rate in the natural environment. When buried, it remains semi-permanently in the ground. In addition, the discarded plastics have caused problems such as damage to the landscape and destruction of the living environment of marine life.
【０００３】又、分解性に効果があるポリヒドロキシブ
チレートとポリヒドロキシバレレートの共重合体や、澱
粉系の分解製プラスチック等で成形した容器も開発され
ている。しかし、これらのプラスチックは強度、剛性が
低く、また、通常使用保存する環境下でカビが生えたり
鼠がかじる可能性があり食品容器としては好ましくな
い。さらに、これらのプラスチックでできた容器は透明
性が不十分なため、充填されている内容物が確認できな
いという欠点がある。Also, a container formed of a copolymer of polyhydroxybutyrate and polyhydroxyvalerate, which has an effect on degradability, or a starch-based degradable plastic, has been developed. However, these plastics are low in strength and rigidity, and may grow mold or bite the mouse under the environment where they are usually used and stored, which is not preferable as a food container. In addition, the containers made of these plastics have insufficient transparency, so that the filled contents cannot be confirmed.
【０００４】一方、熱可塑性樹脂で生分解性のあるポリ
マーとして、ポリ乳酸または乳酸とその他のヒドロキシ
カルボン酸のコポリマー（以下乳酸系ポリマーと略称す
る）が開発されている。これらのポリマーは、動物の体
内で数カ月から１年で１００％生分解し、又、土壌や海
水中に置かれた場合、湿った環境下では数週間で分解を
始め１年から数年で消滅し、さらに分解生成物は、人体
に無害な乳酸と二酸化炭素と水になるという特性を有し
ている。On the other hand, polylactic acid or a copolymer of lactic acid and other hydroxycarboxylic acid (hereinafter abbreviated as lactic acid-based polymer) has been developed as a thermoplastic resin and biodegradable polymer. These polymers are 100% biodegradable within a few months to a year in the animal body, and when placed in soil or seawater, they begin to degrade within a few weeks in a moist environment and disappear within a year to a few years. In addition, the decomposition product has the property that it becomes lactic acid, carbon dioxide, and water that are harmless to the human body.
【０００５】ポリ乳酸は、通常ラクタイドと呼ばれる乳
酸の環状２量体から合成され、その製造法に関してはＵ
ＳＰ１，９９５，９７０、ＵＳＰ２，３６２，５１１、
ＵＳＰ２，６８３，１３６に開示されている。また乳酸
とその他のヒドロキシカルボン酸のコポリマーは、通常
乳酸の環状２量体であるラクタイドとヒドロキシカルボ
ン酸の環状エステル中間体（通常グリコール酸の２量体
であるグリコライド）から合成され、その製造方法に関
しては、ＵＳＰ３，６３６，９５６とＵＳＰ３，７９
７，４９９に開示されている。しかし、上記分解性ポリ
マーを用いた使い捨て食品容器は開発されておらず、自
然環境下で容易に分解してしまう使い捨て食品容器は現
状では皆無である。Polylactic acid is usually synthesized from a cyclic dimer of lactic acid called lactide.
SP1,995,970, USP2,362,511,
It is disclosed in USP 2,683,136. A copolymer of lactic acid and other hydroxycarboxylic acid is usually synthesized from lactide, which is a cyclic dimer of lactic acid, and a cyclic ester intermediate of hydroxycarboxylic acid (usually glycolide, which is a dimer of glycolic acid). Regarding the method, USP 3,636,956 and USP 3,79
7, 499. However, a disposable food container using the above degradable polymer has not been developed, and at present, there is no disposable food container that easily decomposes in a natural environment.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、自然環境下
で分解可能であり、食品の収納に適した容器を提供する
ことにある。特に、少なくとも一部、例えばふたの部分
が透明であり内容物を確認できる食品容器を提供するこ
とにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a container which can be decomposed in a natural environment and is suitable for storing food. In particular, it is to provide a food container in which at least a part, for example, a lid part is transparent and whose contents can be confirmed.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意検討した結果、乳酸系ポリマーを
主成分とする樹脂が強度と剛性が高く、同時に耐カビ性
が高いことを見いだし本発明を完成したものである。ま
た、乳酸系ポリマーを主成分とする樹脂を射出成形、圧
空または真空成形等により成形された容器は、優れて透
明性のため内容物が確認できる食品容器となることを見
いだし本発明を完成した。即ち、本発明は、ポリ乳酸系
ポリマーを主成分とする熱可塑性ポリマー組成物からな
る使い捨て食品容器である。Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a resin containing a lactic acid-based polymer as a main component has high strength and rigidity, and at the same time has high mold resistance. The inventors have found the present invention and completed the present invention. Further, they have found that a container formed by injection-molding a resin containing a lactic acid-based polymer as a main component, compressed air or vacuum molding is a food container whose contents can be confirmed due to its excellent transparency, and completed the present invention. . That is, the present invention is a disposable food container made of a thermoplastic polymer composition containing a polylactic acid polymer as a main component.
【０００８】本発明に用いられるポリマーは、ポリ乳酸
系ポリマーが主成分として用いられその他のヒドロキシ
カルボン酸としては、グリコール酸、３−ヒドロキシ酪
酸、４−ヒドロキシ酪酸、４−ヒドロキシ吉草酸、５−
ヒドロキシ吉草酸、６−ヒドロキシカプロン酸等が用い
られる。The polymer used in the present invention is mainly composed of a polylactic acid-based polymer, and other hydroxycarboxylic acids include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 5-hydroxybutyric acid and 5-hydroxybutyric acid.
Hydroxyvaleric acid, 6-hydroxycaproic acid and the like are used.
【０００９】ポリ乳酸系ポリマーは、乳酸または乳酸と
他のヒドロキシカルボン酸から直接脱水重縮合するか、
乳酸の環状２量体であるラクタイドまたはヒドロキシカ
ルボン酸の環状エステル中間体、例えばグリコール酸の
２量体であるグリコライド（ＧＬＤ）や６−ヒドロキシ
カプロン酸の環状エステルであるε−カプロラクトン
（ＣＬ）等の共重合可能なモノマーを適宜用いて開環重
合させた物でもよい。原料としての乳酸は、Ｌ−乳酸ま
たはＤ−乳酸またはそれらの混合物のいずれでもよい。The polylactic acid type polymer is directly dehydrated and polycondensed from lactic acid or lactic acid and other hydroxycarboxylic acid, or
Lactide, a cyclic dimer of lactic acid, or a cyclic ester intermediate of a hydroxycarboxylic acid, for example, glycolide (GLD), which is a dimer of glycolic acid, or ε-caprolactone (CL), a cyclic ester of 6-hydroxycaproic acid. A ring-opening polymerized product may be used by appropriately using a copolymerizable monomer such as. Lactic acid as a raw material may be L-lactic acid, D-lactic acid, or a mixture thereof.
【００１０】乳酸系ポリマーには、通常公知の熱可塑性
ポリマーまたは可塑剤、さらに各種の改質剤を用いて、
熱可塑性ポリマー組成物とする。公知の熱可塑性ポリマ
ーとしては、ポリグリコール酸、ポリε−カプロラクト
ン等の分解性の物が好ましい。熱可塑性ポリマー組成物
中の乳酸系ポリマーの占める割合は、目的とする分解性
より任意の割合の物が用いられるが、一般的には５０％
以上が好ましい。又熱可塑性ポリマー組成物の製造は、
公知の混練技術はすべて適用できるが、組成物の形状は
ペレット、棒状、紛状等で用いられる。For the lactic acid-based polymer, generally known thermoplastic polymers or plasticizers and various modifiers are used,
A thermoplastic polymer composition. As the known thermoplastic polymer, degradable substances such as polyglycolic acid and poly ε-caprolactone are preferable. The proportion of the lactic acid-based polymer in the thermoplastic polymer composition may be any proportion depending on the desired degradability, but is generally 50%.
The above is preferable. Further, the production of the thermoplastic polymer composition,
All known kneading techniques can be applied, but the composition is used in the form of pellets, rods, powder or the like.
【００１１】本発明の食品容器は、一般的な射出成形、
圧空または真空成形により製造することができる。例え
ば、真空成形の場合は押出機により、乳酸系ポリマー
を１５０〜２５０℃、好ましくは１８０〜２２０℃で溶
融させ、押出機の先端に取り付けたＴダイからシートを
得、該シートを１０〜５０℃好ましくは２０〜３０℃の
冷却エアー等で急冷してシートを得るかまたは、プレ
ス成形により、上下の金型を１８０〜２６０℃に加熱
し、該ポリマーを金形内に挿入した後、金形温度を１０
〜５０℃好ましくは２０〜３０℃に急冷して透明性の優
れたシートを得る。次に、真空成形機または、真空圧空
成形機にてシートの上面と下面をヒーターで加熱しシー
トを軟化させる。この時のシート温度は５５〜９０℃の
範囲である。次いで軟化したシートを、雌型を備えた成
形金型で、金型温度を乳酸系ポリマーのＴｇ点以上の温
度（５０〜７０℃）に設定し、真空吸引または圧空圧力
によって金型内に該シートを密着成形させた後、金型内
温度をＴｇ点以下の温度（例えば２０℃）にして成形物
を金型から取り出すことにより製造される。このように
して得られた乳酸系ポリマー成形物は、透明性が優れて
おり、成形物中の内容物の状態が明確となり、食品容器
として好適なものである。以下、実施例により本発明を
さらに具体的に説明する。The food container of the present invention is manufactured by general injection molding,
It can be manufactured by pressure forming or vacuum forming. For example, in the case of vacuum forming, a lactic acid polymer is melted by an extruder at 150 to 250 ° C., preferably 180 to 220 ° C., a sheet is obtained from a T die attached to the tip of the extruder, and the sheet is 10 to 50. C. Preferably, the sheet is obtained by quenching with cooling air or the like at 20 to 30.degree. C., or the upper and lower molds are heated to 180 to 260.degree. C. by press molding, and the polymer is inserted into the mold, Shape temperature 10
To 50 ° C., preferably 20 to 30 ° C. to obtain a sheet having excellent transparency. Next, the sheet is softened by heating the upper and lower surfaces of the sheet with a heater using a vacuum forming machine or a vacuum air pressure forming machine. The sheet temperature at this time is in the range of 55 to 90 ° C. Then, the softened sheet is set in a mold with a female mold by setting the mold temperature to a temperature (50 to 70 ° C.) not lower than the Tg point of the lactic acid-based polymer, and vacuum suction or compressed air pressure into the mold. After the sheet is contact-molded, the temperature inside the mold is set to a temperature not higher than the Tg point (for example, 20 ° C.) and the molded product is taken out from the mold. The lactic acid-based polymer molded product thus obtained has excellent transparency and the state of the contents in the molded product becomes clear, and it is suitable as a food container. Hereinafter, the present invention will be described in more detail with reference to Examples.
【００１２】[0012]
製造例１ Ｌ−ラクタイド１０ｋｇ（１．５モル）およびオクタン
酸スズ０．０１重量％と、ラウリルアルコール０．０３
重合％を、撹拌機を備えた肉厚の円筒型ステンレス製重
合容器へ封入し、真空で２時間脱気した後窒素ガスで置
換した。この混合物を窒素雰囲気下で撹拌しつつ２００
℃で３時間加熱した。温度をそのまま保ちながら、排気
管及びガラス製受器を介して真空ポンプにより徐々に脱
気し反応容器内を３ｍｍＨｇまで減圧にした。脱気開始
から１時間後、モノマーや低分子量揮発分の留出がなく
なったので、容器内を窒素置換し、容器下部からポリマ
ーを紐状に抜き出してペレット化し、ポリＬ−乳酸を得
た。このポリマーの分子量は約１０万であった。Production Example 1 10 kg (1.5 mol) of L-lactide, 0.01% by weight of tin octoate, and 0.03 of lauryl alcohol
The polymerization% was sealed in a thick cylindrical polymerization container made of stainless steel equipped with a stirrer, deaerated under vacuum for 2 hours, and then replaced with nitrogen gas. This mixture is stirred under a nitrogen atmosphere for 200
Heated at ° C for 3 hours. While maintaining the temperature as it was, the inside of the reaction vessel was depressurized to 3 mmHg by gradually degassing with a vacuum pump through an exhaust pipe and a glass receiver. One hour after the start of degassing, the distillation of the monomer and low-molecular-weight volatile matter disappeared, so the interior of the container was replaced with nitrogen, and the polymer was extracted from the lower part of the container in the form of a string and pelletized to obtain poly L-lactic acid. The molecular weight of this polymer was about 100,000.
【００１３】製造例２ ９０％Ｌ−乳酸１０．０ｋｇを１５０℃／５０ｍｍＨｇ
で３時間撹拌しながら水を留出させた後、錫末６．２ｇ
を加え、１５０℃／３０ｍｍＨｇでさらに２時間撹拌し
てオリゴマー化した。このオリゴマーに錫末２８．８ｇ
とジフェニルエーテル２１．１ｋｇを加え、１５０℃／
３５ｍｍＨｇで共沸脱水反応を行い留出した水と溶媒を
水分離器で分離して溶媒のみを反応機に戻した。２時間
後、反応機に戻す有機溶媒を４．６ｋｇのモレキュラシ
ーブ３Ａを充填したカラムに通してから反応機に戻るよ
うにして、１５０℃／３５ｍｍＨｇで４０時間反応を行
い平均分子量Ｍｗ＝１１０，０００のポリ乳酸溶液を得
た。この溶液に脱水したジフェニルエーテル４４ｋｇを
加え希釈した後４０℃まで冷却して、析出した結晶を濾
過し、１０ｋｇのｎ−ヘキサンで３回洗浄して６０℃／
５０ｍｍＨｇで乾燥した。この粉末を０．５Ｎ−ＨＣｌ
１２．ｋｇとエタノール１２．０ｋｇを加え、３５℃で
１時間撹拌した後濾過し、６０℃／５０ｍｍＨｇで乾燥
して、ポリ乳酸粉末６．１ｋｇ（収率８５％）を得た。
この粉末をペレット化機で処理しペレット状にして以下
の試験に用いた。得られたポリマーの平均分子量はＭｗ
＝１１０、０００であった。Production Example 2 10.0 kg of 90% L-lactic acid was added to 150 ° C./50 mmHg
After distilling water with stirring for 3 hours, 6.2 g of tin powder
Was added, and the mixture was stirred at 150 ° C./30 mmHg for 2 hours for oligomerization. 28.8 g of tin powder in this oligomer
And 21.1 kg of diphenyl ether were added, and 150 ° C /
The azeotropic dehydration reaction was carried out at 35 mmHg, and the distilled water and the solvent were separated by a water separator, and only the solvent was returned to the reactor. After 2 hours, the organic solvent returned to the reactor was passed through a column packed with 4.6 kg of molecular sieve 3A and then returned to the reactor to carry out a reaction at 150 ° C./35 mmHg for 40 hours to give an average molecular weight Mw = 110,000. A polylactic acid solution of After adding 44 kg of dehydrated diphenyl ether to this solution and diluting, it was cooled to 40 ° C., and the precipitated crystals were filtered, washed with 10 kg of n-hexane three times, and 60 ° C. /
It was dried at 50 mmHg. This powder was added to 0.5N-HCl
12. kg and ethanol 12.0 kg were added, the mixture was stirred at 35 ° C. for 1 hour, filtered, and dried at 60 ° C./50 mmHg to obtain 6.1 kg of polylactic acid powder (yield 85%).
This powder was processed in a pelletizer to be pelletized and used in the following tests. The average molecular weight of the obtained polymer is Mw.
= 110,000.
【００１４】尚、ポリマーの平均分子量（重量平均分子
量）はポリスチレンを標準としてゲルパーミエーション
クロマトグラフィーにより以下の条件で測定した。 装置 ：島津ＬＣ−１０ＡＤ 検出器：島津ＲＩＤ−６Ａ カラム：日立化成ＧＬ−Ｓ３５０ＤＴ−５、ＧＬ−Ｓ３
７０ＤＴ−５ 溶媒 ：クロロホルム 濃度 ：１％ 注入量：２０μｌ 流速 ：１．０ｍｌ／ｍｉｎThe average molecular weight (weight average molecular weight) of the polymer was measured by gel permeation chromatography using polystyrene as a standard under the following conditions. Device: Shimadzu LC-10AD Detector: Shimadzu RID-6A Column: Hitachi Chemical GL-S350DT-5, GL-S3
70DT-5 Solvent: Chloroform Concentration: 1% Injection volume: 20 μl Flow rate: 1.0 ml / min
【００１５】実施例１ 製造例１で得られたポリマーを、５０ｍｍΦ押出機の先
端に巾３５０ｍｍのＴダイをつけて、成形温度１８０〜
２２０℃、吐出量２０ｋｇ／ｈｒで厚み０．５ｍｍの透
明なシートを作成した。シートの曲げ弾性率は３５，０
００ｋｇ／ｃｍ 2であった。得られたシートを真空また
は圧空成形が可能な真空圧空成形機（布施真空社、１０
１０−ＰＨＢ）で、金型形状は長径１４６ｍｍ，短径８
０ｍｍで深さ３３ｍｍの容器本体と、深さ１０ｍｍのふ
たの楕円形状容器を使用して下記条件で成形した。Example 1 The polymer obtained in Production Example 1 was mixed with a 50 mmΦ extruder.
A T-die with a width of 350 mm is attached to the end, and the molding temperature is 180-
220 ° C, discharge rate 20 kg / hr, thickness 0.5 mm
Created a clear sheet. The flexural modulus of the sheet is 35,0
00 kg / cm 2Met. Vacuum the resulting sheet
Is a vacuum pressure forming machine capable of pressure forming (Fuse Vacuum Co., Ltd., 10
10-PHB), the mold shape is long diameter 146 mm, short diameter 8
A container body with a depth of 0 mm and a depth of 33 mm and a lid with a depth of 10 mm.
Molded under the following conditions using another oval-shaped container.
【００１６】得られた成形物は東京電色製Ｈａｚｅ Ｍ
ｅｔｅｒによって霞度（ヘイズ）値４．０％であった。
容器本体とふたを温度３５℃、水分３０％の土壌中に埋
設して分解試験を行った結果、３カ月の分解試験後の重
量減少率は１１％で外力により容易に形が崩れた。カビ
抵抗性の試験はＪＩＳ Ｚ−２９１１に準じ無機塩寒天
培地上に、試験片を置き、５種の供試菌の胞子懸濁液を
スプレイ接種し、３０℃で培養し、経時によるカビの生
育を観察した。結果は３カ月後カビの生育が認められな
い。 真空成形条件 真空吸引力 ２５００ ｌ／ｍｉｎ 加熱温度 １５０ ℃ 加熱時間 ９０ 秒 （シ−トの表面温度８
６℃） 金型温度 ２５ ℃ 冷却時間 ３０ 秒The obtained molded product is Haze M manufactured by Tokyo Denshoku.
The haze value was 4.0% as determined by eter.
As a result of carrying out a decomposition test by burying the container body and the lid in soil with a temperature of 35 ° C. and a water content of 30%, the weight loss rate after the decomposition test for 3 months was 11%, and the shape was easily broken by external force. According to JIS Z-2911, the mold resistance test is carried out by placing a test piece on an inorganic salt agar medium, spray inoculating a spore suspension of 5 kinds of test bacteria, and culturing at 30 ° C. The growth was observed. As a result, no mold growth was observed after 3 months. Vacuum forming conditions Vacuum suction force 2500 l / min Heating temperature 150 ° C Heating time 90 seconds (Seat surface temperature 8
6 ℃) Mold temperature 25 ℃ Cooling time 30 seconds
【００１７】実施例２ 製造例２で得られたポリマーを、実施例１と同様にして
透明なシート作成し、真空成形をした。得られた成形物
の霞度（ヘイズ）は３．８％、分解性とカビ抵抗性は実
施例１と同じであった。Example 2 A transparent sheet was prepared from the polymer obtained in Production Example 2 in the same manner as in Example 1 and vacuum molded. The haze of the obtained molded product was 3.8%, and the degradability and mold resistance were the same as in Example 1.
【００１８】比較例１ 実施例１で用いたポリマーをヒドロキシブチレートとヒ
ドロキシバレレートとの共重合体に変てシートを作成し
て、容器を得た。霞度（ヘイズ）は７０％と透明性が劣
る、分解性は３カ月でほぼ無くなったが、カビ抵抗性試
験では１週間から変化が表れ２〜３週間後にはカビの生
育面積が２／３以上となり、カビ抵抗性がないComparative Example 1 A sheet was prepared by changing the polymer used in Example 1 into a copolymer of hydroxybutyrate and hydroxyvalerate to obtain a container. The haze was 70% and the transparency was poor, and the degradability almost disappeared in 3 months, but the mold resistance test showed a change from 1 week, and the growth area of the mold was 2/3 after 2-3 weeks. And above, there is no mold resistance
【００１９】[0019]
【発明の効果】本発明による乳酸系ポリマーを主体とす
る熱可塑性樹脂組成物からなる使い捨て食品容器は、自
然環境下で分解可能であり、耐カビ性に優れる等食品の
収納に適したものである。EFFECT OF THE INVENTION A disposable food container made of a thermoplastic resin composition mainly composed of a lactic acid-based polymer according to the present invention is suitable for storing foods such as it is decomposable in a natural environment and has excellent mold resistance. is there.
Claims (6)
ルボン酸のコポリマーを主成分とする熱可塑性ポリマー
組成物からなる使い捨て食品容器。1. A disposable food container made of a thermoplastic polymer composition containing polylactic acid or a copolymer of lactic acid and another hydroxycarboxylic acid as a main component.
の混合物であることを特徴とする請求項１記載の使い捨
て食品容器。2. The disposable food container according to claim 1, wherein the lactic acid is L-lactic acid, D-lactic acid or a mixture thereof.
あることを特徴とする請求項１記載の使い捨て食品容
器。3. The disposable food container according to claim 1, wherein the hydroxycarboxylic acid is glycolic acid.
が５％以下であることを特徴とする請求項１記載の使い
捨て食品容器。4. At least a part of the container has a haze.
Is 5% or less, The disposable food container according to claim 1, wherein
請求項１記載の使い捨て食品容器。5. The disposable food container according to claim 1, wherein the container is a lunch box container.
請求項１記載の使い捨て食品容器。6. The disposable food container according to claim 1, wherein the container is a beverage container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08649193A JP3375369B2 (en) | 1993-04-13 | 1993-04-13 | Disposable food containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08649193A JP3375369B2 (en) | 1993-04-13 | 1993-04-13 | Disposable food containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06298236A true JPH06298236A (en) | 1994-10-25 |
| JP3375369B2 JP3375369B2 (en) | 2003-02-10 |
Family
ID=13888461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08649193A Ceased JP3375369B2 (en) | 1993-04-13 | 1993-04-13 | Disposable food containers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3375369B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045801A2 (en) * | 2001-11-21 | 2003-06-05 | 3M Innovative Properties Company | Plastic transport and storage pallet comprising a polymeric composition |
| JP2003276078A (en) * | 2002-03-22 | 2003-09-30 | Yoshimura Kasei Kk | Thermoforming method for polylactic acid biodegradable resin sheet |
| JP2006328368A (en) * | 2005-04-28 | 2006-12-07 | Toray Ind Inc | Sheet containing polylactic acid resin, method for producing the same and container |
| JP2008063502A (en) * | 2006-09-09 | 2008-03-21 | Tohcello Co Ltd | Polylactic acid based thermoformed product |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992005311A1 (en) * | 1990-09-26 | 1992-04-02 | E.I. Du Pont De Nemours And Company | Cellulosic pulp bonded by polyhydroxy acid resins |
| JPH04504731A (en) * | 1988-08-08 | 1992-08-20 | バイオパック テクノロジー，リミテッド | Degradable lactide thermoplastic |
| JPH04304244A (en) * | 1991-04-01 | 1992-10-27 | Mitsui Toatsu Chem Inc | Degradable foam |
| JPH04335060A (en) * | 1991-05-10 | 1992-11-24 | Mitsui Toatsu Chem Inc | Degradable thermoplastic polymer composition |
| JPH0539227A (en) * | 1990-12-19 | 1993-02-19 | Takeda Chem Ind Ltd | Drink agent |
| JPH0539381A (en) * | 1991-08-08 | 1993-02-19 | Mitsui Toatsu Chem Inc | Biodegradable polymer composition |
| JPH0551051A (en) * | 1991-08-13 | 1993-03-02 | Dainippon Printing Co Ltd | Disposable lunch container |
| JPH0551073A (en) * | 1991-08-21 | 1993-03-02 | Toppan Printing Co Ltd | Plastic container |
| JPH06340753A (en) * | 1993-06-02 | 1994-12-13 | Mitsui Toatsu Chem Inc | Degradable card |
-
1993
- 1993-04-13 JP JP08649193A patent/JP3375369B2/en not_active Ceased
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04504731A (en) * | 1988-08-08 | 1992-08-20 | バイオパック テクノロジー，リミテッド | Degradable lactide thermoplastic |
| WO1992005311A1 (en) * | 1990-09-26 | 1992-04-02 | E.I. Du Pont De Nemours And Company | Cellulosic pulp bonded by polyhydroxy acid resins |
| JPH0539227A (en) * | 1990-12-19 | 1993-02-19 | Takeda Chem Ind Ltd | Drink agent |
| JPH04304244A (en) * | 1991-04-01 | 1992-10-27 | Mitsui Toatsu Chem Inc | Degradable foam |
| JPH04335060A (en) * | 1991-05-10 | 1992-11-24 | Mitsui Toatsu Chem Inc | Degradable thermoplastic polymer composition |
| JPH0539381A (en) * | 1991-08-08 | 1993-02-19 | Mitsui Toatsu Chem Inc | Biodegradable polymer composition |
| JPH0551051A (en) * | 1991-08-13 | 1993-03-02 | Dainippon Printing Co Ltd | Disposable lunch container |
| JPH0551073A (en) * | 1991-08-21 | 1993-03-02 | Toppan Printing Co Ltd | Plastic container |
| JPH06340753A (en) * | 1993-06-02 | 1994-12-13 | Mitsui Toatsu Chem Inc | Degradable card |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045801A2 (en) * | 2001-11-21 | 2003-06-05 | 3M Innovative Properties Company | Plastic transport and storage pallet comprising a polymeric composition |
| WO2003045801A3 (en) * | 2001-11-21 | 2003-12-04 | 3M Innovative Properties Co | Plastic transport and storage pallet comprising a polymeric composition |
| US7216592B2 (en) | 2001-11-21 | 2007-05-15 | 3M Innovative Properties Company | Plastic shipping and storage containers and composition and method therefore |
| JP2003276078A (en) * | 2002-03-22 | 2003-09-30 | Yoshimura Kasei Kk | Thermoforming method for polylactic acid biodegradable resin sheet |
| JP2006328368A (en) * | 2005-04-28 | 2006-12-07 | Toray Ind Inc | Sheet containing polylactic acid resin, method for producing the same and container |
| JP2008063502A (en) * | 2006-09-09 | 2008-03-21 | Tohcello Co Ltd | Polylactic acid based thermoformed product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3375369B2 (en) | 2003-02-10 |
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