JPH07196903A - Molded article of biodegradable resin - Google Patents
Molded article of biodegradable resinInfo
- Publication number
- JPH07196903A JPH07196903A JP33607093A JP33607093A JPH07196903A JP H07196903 A JPH07196903 A JP H07196903A JP 33607093 A JP33607093 A JP 33607093A JP 33607093 A JP33607093 A JP 33607093A JP H07196903 A JPH07196903 A JP H07196903A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- biodegradable resin
- biodegradable
- molded article
- layer
- 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.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、生分解性樹脂成形物に
関する。本発明は、特に、生分解性樹脂の生分解性を制
御可能にした生分解性樹脂成形物に関する。TECHNICAL FIELD The present invention relates to a biodegradable resin molded product. The present invention particularly relates to a biodegradable resin molded product capable of controlling the biodegradability of the biodegradable resin.
【０００２】[0002]
【従来の技術】生分解性樹脂は、近年、環境保護のため
の材料として、広く利用されるようになってきている。
現在の利用分野は、そのほとんどが使い捨ての分野であ
り、耐久性を要する部分に利用されている例はほとんど
ない。生分解性樹脂は、環境に存在する微生物により分
解され、消化されて自然に帰ることを特徴とした材料で
ある。しかし、その微生物によって分解される性質か
ら、使用中に微生物（例えば黴）によって劣化してしま
うことがあり、従ってその利用分野はごみ袋や使い捨て
用品に限られている。生分解性樹脂を長期間使用するた
めには、微生物による劣化をまず抑えなければならな
い。そこで、樹脂に抗菌剤を添加して微生物による生分
解を遅らせることが試みられている（特開平５−５１０
７３号）。2. Description of the Related Art In recent years, biodegradable resins have come to be widely used as materials for environmental protection.
Most of the current fields of use are disposable fields, and there are few examples in which they are used in parts requiring durability. The biodegradable resin is a material characterized by being decomposed by microorganisms existing in the environment, digested and returning to nature. However, due to its property of being decomposed by microorganisms, it may be deteriorated by microorganisms (for example, mold) during use, and therefore its application field is limited to garbage bags and disposable items. In order to use the biodegradable resin for a long period of time, it is necessary to first suppress deterioration by microorganisms. Therefore, it has been attempted to add an antibacterial agent to the resin to delay biodegradation by microorganisms (JP-A-5-510).
No. 73).
【０００３】[0003]
【発明が解決しようとする課題】しかし、生分解性樹脂
に直接抗菌剤を添加したものは、抗菌剤の放出を制御す
ることが困難であるという問題がある。すなわち、抗菌
剤の放出が早すぎれば、その効果は不十分となる。ま
た、抗菌剤の放出があまりにも遅ければ、生分解を開始
するまでの期間が長くなりすぎるおそれがある。However, a biodegradable resin to which an antibacterial agent is directly added has a problem that it is difficult to control the release of the antibacterial agent. That is, if the antibacterial agent is released too early, its effect will be insufficient. Further, if the release of the antibacterial agent is too slow, the period until biodegradation may start may be too long.
【０００４】従って、本発明は、上記の如き従来技術の
欠点を解消し、生分解性を制御した生分解性樹脂成形物
を提供しようとするものである。Therefore, the present invention is intended to solve the above-mentioned drawbacks of the prior art and to provide a biodegradable resin molded article having controlled biodegradability.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記課題を解
決するため、生分解性を有する樹脂の層と、この樹脂層
を被覆する、抗菌剤を含む光分解可能な樹脂の層とを含
む樹脂成形物を提供する。例えば、生分解性樹脂成形物
を層状構造とし、その最外層のみに抗菌剤を添加するこ
とで樹脂が微生物により劣化することを防ぐ。そして、
この成形物の最外層を光分解性を有する樹脂をコートす
ることにより形成して、光分解性樹脂に抗菌剤を保持さ
せるのである。In order to solve the above problems, the present invention provides a layer of a biodegradable resin and a layer of a photodegradable resin containing an antibacterial agent, which coats the resin layer. A resin molded product containing the same is provided. For example, the biodegradable resin molded product has a layered structure and an antibacterial agent is added only to the outermost layer thereof to prevent the resin from being deteriorated by microorganisms. And
The outermost layer of this molded article is formed by coating a photodegradable resin so that the photodegradable resin holds an antibacterial agent.
【０００６】本発明に有用な生分解性樹脂の代表的な例
としては、ポリ（３−ヒドロキシ酪酸）、３−ヒドロキ
シ酪酸／３−ヒドロキシ吉草酸共重合体、３−ヒドロキ
シ酪酸／４−ヒドロキシ酪酸共重合体、キチン・キトサ
ン、セルロース・キトサン、ポリ乳酸、ポリグリコール
酸、ポリカプロラクトン、アミドエステル共重合体、ポ
リエステルエーテル、ポリビニルアルコール等を挙げる
ことができる。Representative examples of biodegradable resins useful in the present invention include poly (3-hydroxybutyric acid), 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer, 3-hydroxybutyric acid / 4-hydroxyl. Examples thereof include butyric acid copolymer, chitin / chitosan, cellulose / chitosan, polylactic acid, polyglycolic acid, polycaprolactone, amide ester copolymer, polyester ether, and polyvinyl alcohol.
【０００７】光分解性樹脂の例としては、エチレン／一
酸化炭素共重合体、ビニルケトン／ビニルモノマー共重
合体、ポリイソブチレンオキシド等を挙げることができ
る。また、抗菌剤の例としては、２−（４−チアゾリ
ル）−ベンズイミダゾール、２−（メトキシカルボニル
アミノ））−ベンズイミダゾール、ビス（２−ビリジル
チオ−１−オキシド）亜鉛、ジヨードメチル−ｐ−トリ
ルスルホン、ゼオライト／銀、ヒドロキシアパタイト／
銀、シリカ／銀等を挙げることができる。Examples of the photodegradable resin include ethylene / carbon monoxide copolymer, vinyl ketone / vinyl monomer copolymer, polyisobutylene oxide and the like. Examples of the antibacterial agent include 2- (4-thiazolyl) -benzimidazole, 2- (methoxycarbonylamino))-benzimidazole, bis (2-pyridylthio-1-oxide) zinc, diiodomethyl-p-tolylsulfone. , Zeolite / silver, hydroxyapatite /
Mention may be made of silver, silica / silver and the like.
【０００８】本発明に係る上記の構造を有する生分解性
樹脂成形物は、その使用中に微生物による劣化を受けず
に、長期間使用可能となる。成形物が不要となったとき
には、成形物に可視光もしくは紫外線を照射し、光分解
性樹脂を分解させ、除去することによって抗菌剤層を除
去する。肉薄成形物の場合にも同様の方法で抗菌剤を除
去できる。The biodegradable resin molded product according to the present invention having the above structure can be used for a long period of time without being deteriorated by microorganisms during its use. When the molded product is no longer needed, the antibacterial agent layer is removed by irradiating the molded product with visible light or ultraviolet light to decompose and remove the photodegradable resin. The antibacterial agent can be removed by the same method in the case of a thin molded product.
【０００９】[0009]
【作用】以上に説明したように、生分解性樹脂の表面に
抗菌剤を含む光分解性樹脂層を配置することによって、
生分解性樹脂の対微生物耐性を向上させ、生分解性樹脂
の耐久性を向上させるのである。樹脂成形物が不要にな
れば、屋外に放置することにより、光分解性樹脂が分解
され、抗菌剤が放出されて抗菌性を失うので、生分解性
樹脂の分解が開始されることとなる。As described above, by disposing the photodegradable resin layer containing the antibacterial agent on the surface of the biodegradable resin,
It improves the microbial resistance of the biodegradable resin and improves the durability of the biodegradable resin. When the resin molded product becomes unnecessary, the photodegradable resin is decomposed by leaving it outdoors, the antibacterial agent is released, and the antibacterial property is lost, so that the decomposition of the biodegradable resin is started.
【００１０】[0010]
【実施例】以下に実施例を挙げ、本発明をさらに説明す
る。 実施例１ 生分解性樹脂としてポリヒドロキシ酪酸−ポリヒドロキ
シ吉草酸共重合体を用い、光分解性樹脂としてエチレン
−一酸化炭素共重合体を用い、また抗菌剤としてヒドロ
キシアパタイトを担体とする銀イオンを用いた。板状に
成形した生分解性樹脂に、抗菌剤を添加した光分解性樹
脂のフィルムを密着させ、内部の生分解性樹脂を保護し
た。このようにして作った板材（１ｃｍ×１ｃｍ、厚さ
３ｍｍ）を生分解性プラスチックを分解することが知ら
れているシュードモナス属の細菌を培養している容器に
入れたところ、図１に示すとおり、時間の経過と共に生
菌数が減少し、試験開始後２０日間で細菌は完全に死滅
した。また、野ざらしの状態で廃棄された場合を想定し
て、同様の試料を黒土の上に放置して分解量を厚さの変
化として記録した。その結果、図２に示すとおり、最初
の１週間で光分解により表層が分解して消失し、次いで
生分解性樹脂の部分が６０日で初期厚さの６６％まで減
少した。EXAMPLES The present invention will be further described with reference to the following examples. Example 1 A silver ion using polyhydroxybutyric acid-polyhydroxyvaleric acid copolymer as a biodegradable resin, ethylene-carbon monoxide copolymer as a photodegradable resin, and hydroxyapatite as a carrier as an antibacterial agent. Was used. A film of photodegradable resin containing an antibacterial agent was adhered to the plate-shaped biodegradable resin to protect the biodegradable resin inside. The plate material (1 cm x 1 cm, thickness 3 mm) thus prepared was placed in a container for culturing Pseudomonas bacteria known to decompose biodegradable plastic. The number of viable bacteria decreased with the passage of time, and the bacteria were completely killed 20 days after the start of the test. Also, assuming that the sample was discarded in the state of being exposed, the same sample was left on black soil and the amount of decomposition was recorded as a change in thickness. As a result, as shown in FIG. 2, the surface layer was decomposed and disappeared by photolysis in the first week, and then the biodegradable resin portion decreased to 66% of the initial thickness in 60 days.
【００１１】実施例２ 生分解性樹脂としてセルロース・キトサンを用い、光分
解性樹脂としてポリイソブチレンオキシドを用い、また
抗菌剤として２−（４−チアゾリル）−ベンズイミダゾ
ールを用いた。板状に押出成形した生分解性樹脂の両面
に、抗菌剤を含む光分解性樹脂のフィルムを成形した。
光分解性樹脂の量は、生分解性樹脂の重量に対して５重
量％であった。この板状成形物をそのまま山林に埋設し
たところ、３箇月経過後においても、重量および引張強
度ともに初期の値を保持していた。これに対して、上記
と同じ成形物に波長３００ｎｍの紫外線を３昼夜照射
し、次いで山林に埋設した場合には、埋設３箇月後、重
量で２０％、引張強度で４０％の低下が認められた。Example 2 Cellulose chitosan was used as a biodegradable resin, polyisobutylene oxide was used as a photodegradable resin, and 2- (4-thiazolyl) -benzimidazole was used as an antibacterial agent. A film of a photodegradable resin containing an antibacterial agent was formed on both sides of the biodegradable resin extruded into a plate shape.
The amount of photodegradable resin was 5% by weight, based on the weight of biodegradable resin. When this plate-shaped molded product was directly embedded in a forest, the initial values of weight and tensile strength were maintained even after 3 months. On the other hand, when the same molded product as described above was irradiated with ultraviolet rays having a wavelength of 300 nm for 3 days and night and then buried in a forest, a decrease of 20% in weight and a decrease of 40% in tensile strength were observed after 3 months of burying. It was
【００１２】[0012]
【発明の効果】以上説明したように、本発明によれば、
使用中の耐久性が高く、使用後には任意に生分解を生起
させることのできる樹脂成形物を提供することができ、
生分解性樹脂の利便性を高めることに大きく寄与するこ
とができる。As described above, according to the present invention,
Durability during use is high, and it is possible to provide a resin molded product that can optionally undergo biodegradation after use,
It can greatly contribute to improving the convenience of the biodegradable resin.
【図１】本発明の実施例で得られた生分解性樹脂成形物
の抗菌性を示すグラフである。FIG. 1 is a graph showing the antibacterial properties of the biodegradable resin moldings obtained in the examples of the present invention.
【図２】本発明の実施例で得られた生分解性樹脂成形物
を屋外に放置したときの分解性を示すグラフである。あ
る。FIG. 2 is a graph showing the degradability of the biodegradable resin moldings obtained in the examples of the present invention when left outdoors. is there.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｋ 5/3477 ＫＪＺ Ｃ０８Ｌ 5/08 ＬＡＸ 29/04 ＬＧＷ 73/00 ＬＱＱ 77/12 ＬＱＲ // Ｃ０８Ｌ 101/00 ＬＳＹ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location C08K 5/3477 KJZ C08L 5/08 LAX 29/04 LGW 73/00 LQQ 77/12 LQR // C08L 101/00 LSY
Claims (1)
層を被覆する、抗菌剤を含む光分解可能な樹脂の層とを
含む樹脂成形物。1. A resin molded article comprising a biodegradable resin layer and a photodegradable resin layer containing an antibacterial agent, which coats the resin layer.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33607093A JPH07196903A (en) | 1993-12-28 | 1993-12-28 | Molded article of biodegradable resin |
| DE4418634A DE4418634C2 (en) | 1993-09-14 | 1994-05-27 | A biodegradable resin molded article, a modification method of a resin, a resin composition, and a molded resin article |
| GB9719393A GB2315453B (en) | 1993-09-14 | 1994-05-27 | Biodegradable moulded article |
| GB9410667A GB2281709B (en) | 1993-09-14 | 1994-05-27 | Biodegradable resin moulded article |
| US08/443,573 US5545485A (en) | 1993-09-14 | 1995-05-17 | Biodegradable resin molded article |
| US08/712,113 US5744516A (en) | 1993-09-14 | 1996-09-11 | Biodegradable resin molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33607093A JPH07196903A (en) | 1993-12-28 | 1993-12-28 | Molded article of biodegradable resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07196903A true JPH07196903A (en) | 1995-08-01 |
Family
ID=18295388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33607093A Pending JPH07196903A (en) | 1993-09-14 | 1993-12-28 | Molded article of biodegradable resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07196903A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199334A (en) * | 2015-09-17 | 2015-12-30 | 苏州新区佳合塑胶有限公司 | Antibacterial high-filled degradable plastic |
-
1993
- 1993-12-28 JP JP33607093A patent/JPH07196903A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199334A (en) * | 2015-09-17 | 2015-12-30 | 苏州新区佳合塑胶有限公司 | Antibacterial high-filled degradable plastic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20020219 |