JPH0481450A - Decomposable ethylene copolymer composition - Google Patents
Decomposable ethylene copolymer compositionInfo
- Publication number
- JPH0481450A JPH0481450A JP19476390A JP19476390A JPH0481450A JP H0481450 A JPH0481450 A JP H0481450A JP 19476390 A JP19476390 A JP 19476390A JP 19476390 A JP19476390 A JP 19476390A JP H0481450 A JPH0481450 A JP H0481450A
- Authority
- JP
- Japan
- Prior art keywords
- ethylene copolymer
- copolymer
- hydroxybutyrate
- ethylene
- aliphatic polyester
- 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
- 229920001038 ethylene copolymer Polymers 0.000 title claims abstract description 33
- 239000000203 mixture Substances 0.000 title claims abstract description 23
- 229920003232 aliphatic polyester Polymers 0.000 claims abstract description 20
- 229920001577 copolymer Polymers 0.000 claims abstract description 14
- WHBMMWSBFZVSSR-UHFFFAOYSA-M 3-hydroxybutyrate Chemical compound CC(O)CC([O-])=O WHBMMWSBFZVSSR-UHFFFAOYSA-M 0.000 claims abstract description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000005977 Ethylene Substances 0.000 claims abstract description 6
- WHBMMWSBFZVSSR-UHFFFAOYSA-N R3HBA Natural products CC(O)CC(O)=O WHBMMWSBFZVSSR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims abstract description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 3
- AVUFZLGLMCACRE-UHFFFAOYSA-N 2-methylidene-1,3-dioxepane Chemical compound C=C1OCCCCO1 AVUFZLGLMCACRE-UHFFFAOYSA-N 0.000 claims abstract 2
- -1 poly(3-hydroxybutyrate) Polymers 0.000 claims description 17
- 229920001610 polycaprolactone Polymers 0.000 claims description 8
- 239000004632 polycaprolactone Substances 0.000 claims description 8
- 229920000070 poly-3-hydroxybutyrate Polymers 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 244000005700 microbiome Species 0.000 abstract description 6
- 239000000155 melt Substances 0.000 abstract description 3
- REKYPYSUBKSCAT-UHFFFAOYSA-N 3-hydroxypentanoic acid Chemical compound CCC(O)CC(O)=O REKYPYSUBKSCAT-UHFFFAOYSA-N 0.000 abstract 2
- 238000013329 compounding Methods 0.000 abstract 2
- VHMYBWIOLGKSHO-UHFFFAOYSA-N 2-methylidene-1,3-dioxolane Chemical compound C=C1OCCO1 VHMYBWIOLGKSHO-UHFFFAOYSA-N 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000000813 microbial effect Effects 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- SJZRECIVHVDYJC-UHFFFAOYSA-M 4-hydroxybutyrate Chemical compound OCCCC([O-])=O SJZRECIVHVDYJC-UHFFFAOYSA-M 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000010526 radical polymerization reaction Methods 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical group 0.000 description 2
- CCGKOQOJPYTBIH-UHFFFAOYSA-N ethenone Chemical compound C=C=O CCGKOQOJPYTBIH-UHFFFAOYSA-N 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- CZLMRJZAHXYRIX-UHFFFAOYSA-N 1,3-dioxepane Chemical compound C1CCOCOC1 CZLMRJZAHXYRIX-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、微生物分解性、機械的強度及び成形加工性が
優れた分解性エチレン共重合体組成物に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a degradable ethylene copolymer composition that is excellent in microbial degradability, mechanical strength, and moldability.
［従来の技術及び発明が解決しようとする課題］近年、
合成プラスチック廃棄物による環境汚染力） ｒＭ刻な
社会問題になりつつあるなか、土中で自然分解するプラ
スチックに対する要請が高まってきている。[Problems to be solved by conventional techniques and inventions] In recent years,
As the environmental pollution caused by synthetic plastic waste is becoming a pressing social issue, there is an increasing demand for plastics that naturally decompose in the soil.
従来、土中に埋設すると王に微生物により分解されるプ
ラスチックとしては、例えは、ポリカプロラクトン、ポ
リ （３−ヒドロキシブチレート）等の脂肪族ポリエス
テルが知られている。Conventionally, aliphatic polyesters such as polycaprolactone and poly(3-hydroxybutyrate) are known as plastics that are rapidly decomposed by microorganisms when buried in soil.
しかしながら、ポリカプロラクトン単独では機械的強度
に劣るのでポリエチレン包装フィルムのような用途に用
いることができないという欠点、があり、ポリ（３−ヒ
ドロキシブチレート）単独では、結晶性が高いので成形
し難く、衝撃強度が小さいので実用性に乏しいという欠
点があった。However, polycaprolactone alone has the disadvantage that it cannot be used in applications such as polyethylene packaging films because it has poor mechanical strength, and poly(3-hydroxybutyrate) alone is difficult to mold due to its high crystallinity. The drawback was that the impact strength was low, making it impractical.
また、このような欠点を改良した脂肪族ポリエステルと
して、３−ヒドロキシブチレートと３−ヒドロキシパリ
レートとの共重合体、３−ヒドロキシブチレートと４−
ヒドロキシブチレートとの共重合体も知られてはいるが
、これらの脂肪族ポリエステルは、アルカリ土類金属筒
などの微生物を用いて製造するので生産コストが高くな
り、昨今、最もその分解性が要求されている包装フィル
ムのような汎用品には適さないという欠点があった。In addition, as aliphatic polyesters that have improved such drawbacks, copolymers of 3-hydroxybutyrate and 3-hydroxyparylate, copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate, etc.
Copolymers with hydroxybutyrate are also known, but since these aliphatic polyesters are manufactured using microorganisms such as alkaline earth metal cylinders, production costs are high, and recently their degradability has become the most It has the disadvantage that it is not suitable for general-purpose products such as packaging films, which are in demand.
また、汎用プラスチックであるポリエチレンに、デンプ
ンやポリカプロラクトンを混合して微生物分解性を付与
したものも知られているが、このプラスチックでは、デ
ンプンやポリカプロラクトンがポリエチレンで覆われて
いるので、デンプンやポリカプロラクトンが分解され難
く、たとえデンプンやポリカプロラクトンの全てが分解
されたとしても、ポリエチレン自体が分解されずに土中
に残存するという欠点、があった。It is also known that polyethylene, which is a general-purpose plastic, is mixed with starch or polycaprolactone to give it microbial degradability. Polycaprolactone is difficult to decompose, and even if all of the starch and polycaprolactone are decomposed, the polyethylene itself remains undecomposed in the soil.
さらに、２−メチレン−１，３−ジオキソラン、２−メ
チレン−１，３−ジオキソパン等の環状ケテンアセター
ルとエチレンとを高圧ラジカル共重合させて、主鎖にエ
ステル結合（−Ｃｏ−０−）を導入したエチレン共重合
体が報告されており（Ｗ、Ｊ、Ｂａ１ｉｌｅｙ：Ｐｏｌ
ｙｍｅｒ ＪｏｕｒｎａｌＶｏｌ、１７．Ｐ８５〜９５
）、このエチレン共重合体には、微生物分解性があると
されているが、その分解速度は、非常に遅いという欠、
申があった。Furthermore, ester bonds (-Co-0-) are formed in the main chain by high-pressure radical copolymerization of cyclic ketene acetals such as 2-methylene-1,3-dioxolane and 2-methylene-1,3-dioxopane with ethylene. The introduced ethylene copolymer has been reported (W, J, Baliley: Pol
ymer Journal Vol, 17. P85-95
), this ethylene copolymer is said to be degradable by microorganisms, but its decomposition rate is extremely slow.
There was a problem.
本発明の目的は、極めて良好な微生物分解性を有しなが
らも、通常の高圧法低芭度ポリエチレン（ＨＰＬＤＰＥ
）に匹敵するｐｉ械的強度を有する分解性エチレン共重
合体組成物を提供することにある。The object of the present invention is to use conventional high-pressure low-density polyethylene (HPLDPE) that has extremely good microbial degradability.
The object of the present invention is to provide a degradable ethylene copolymer composition having a pi mechanical strength comparable to that of the present invention.
［課題を解決するための手段］
本発明者は、課題を解決するために鋭意検討を重ねた結
果、特定のエチレン共重合体と特定の脂肪族ポリエステ
ルとは、相渚して非常に細かい均な組成物となり、機械
的強度が高まることを見出し、さらに、そのような組成
物では、該脂肪族ポリエステルが、土中の微生物によっ
て比較的速く分解され、しかも月旨月万族ポリエステＪ
しか抜けた跡が微細なボアを形成し、残った多孔性のエ
チレン共重合体は、速やかに分解されることを見出して
本発明に到達した。[Means for Solving the Problems] As a result of intensive studies to solve the problems, the inventors of the present invention discovered that a specific ethylene copolymer and a specific aliphatic polyester work together to form extremely fine and uniform particles. In addition, in such a composition, the aliphatic polyester is relatively quickly decomposed by microorganisms in the soil, and furthermore,
The present invention was achieved by discovering that the traces of the ethylene copolymer formed by the ethylene copolymer formed fine pores, and that the remaining porous ethylene copolymer was rapidly decomposed.
本発明の分解性エチレン共重合体組成物は、主鎖にエス
テル結合を有するエチレン共重合体と次式ＣＩ）
Ｒ０
−Ｏ−ＣＨ＋ＣＨ２＋−Ｔ−Ｃ（Ｉ ）（式中、Ｒは、
水素原子、メチル基又はエチル基を表わし、ｎは、１〜
４の整数を表わす）で示される構造単位を有する脂肪族
ポリエステルとを、前者が１０〜９５重量部に対し、後
者を９０〜５重量部の割合で含有することを特徴とする
。The degradable ethylene copolymer composition of the present invention comprises an ethylene copolymer having an ester bond in the main chain and the following formula CI) R0 -O-CH+CH2+-T-C(I) (wherein, R is
Represents a hydrogen atom, methyl group or ethyl group, and n is 1 to
(representing an integer of 4), the former is characterized by containing 10 to 95 parts by weight of the latter and 90 to 5 parts by weight of the latter.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明で用いる主鎖にエステル結合ｆ−ＣＯ−０−］を
有するエチレン共重合体（以下、単にエチレン共重合体
という）としては、主成分のエチレンと環状ケテンアセ
タールとの共重合体を挙げることができる。Examples of the ethylene copolymer having an ester bond f-CO-0-] in the main chain (hereinafter simply referred to as ethylene copolymer) used in the present invention include copolymers of ethylene and cyclic ketene acetal as main components. be able to.
環状ケテンアセクールとしては、例えば、２メチレン−
１，３−ジオキセパン、２−メチレン−１，３−ジオキ
ソラン等を挙げることができる。中でも好ましいのは、
２−メチレン−１３−ジオキセパンである。As the cyclic ketene acecool, for example, 2 methylene-
Examples include 1,3-dioxepane and 2-methylene-1,3-dioxolane. Among them, the preferred one is
2-methylene-13-dioxepane.
環状ケテンアセクールのエチレン共重合体における含有
量は、０．５〜１０モル％であり、好ましくは、２〜５
モル％である。なお、この含有量が、上記範囲の下限未
満のときには、本発明の組成物の微生物分解性が悪くな
る場合があり、方、上記範囲の上限を超えるときには、
機械的強度が低下する場合がある。The content of cyclic ketene acecool in the ethylene copolymer is 0.5 to 10 mol%, preferably 2 to 5 mol%.
It is mole%. Note that when this content is less than the lower limit of the above range, the microbial degradability of the composition of the present invention may deteriorate, while when it exceeds the upper limit of the above range,
Mechanical strength may decrease.
本発明で用いるエチレン共重合体は、公知の高圧ラジカ
ル重合法を採用して製造することができる。The ethylene copolymer used in the present invention can be produced by employing a known high-pressure radical polymerization method.
エチレン共重合体のメルトインデックス（ＭＩ）は、０
０１〜２０ｇ／１０分てあり、好ましくは、１〜１０ｇ
／ｌ、０分である。ＭＴが、上記範囲の下限未満のとき
には、成形するのに速さない場合があり、上記範囲の上
限を超えるときには、分解速度が遅くなり好ましくない
場合がある。The melt index (MI) of ethylene copolymer is 0
01-20g/10 minutes, preferably 1-10g
/l, 0 minutes. When MT is less than the lower limit of the above range, molding may not be fast, and when it exceeds the upper limit of the above range, the decomposition rate may be slow, which may be undesirable.
本発明で用いる脂肪族ポリエステルとしては、前記式（
Ｉ）で示される構造単位を有する脂肪族ポリエステル（
単独重合体及び／又は共重合体）である（以下、単に脂
肪族ポリエステルという）。The aliphatic polyester used in the present invention has the formula (
Aliphatic polyester having the structural unit represented by I) (
homopolymer and/or copolymer) (hereinafter simply referred to as aliphatic polyester).
脂肪族ポリエステルとしては、例えば、ポリカプロラク
トン、ポリ（３−ヒドロキシブチレート）、３−ヒドロ
キシブチレートと３−ヒドロキシパリレートとの共重合
体、３−ヒドロキシブチレートと４−ヒドロキシブチレ
ートとの共重合体等を挙げることができる。この脂肪族
ポリエステルの平均分子量は、通常３，０００〜３００
０．０００程度であり、分解性の点て、１０．０００〜
１．５００．０００が好ましい。Examples of aliphatic polyesters include polycaprolactone, poly(3-hydroxybutyrate), copolymers of 3-hydroxybutyrate and 3-hydroxyparylate, and copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate. Copolymers and the like can be mentioned. The average molecular weight of this aliphatic polyester is usually 3,000 to 300.
It is about 0.000, and in terms of degradability, it is about 10.000~
1.500.000 is preferred.
本発明の組成物は、前記エチレン共重合体が１０〜９５
重量部に対して、前記脂肪族ポリエステルを９０〜５重
量部の割合で含有する。In the composition of the present invention, the ethylene copolymer contains 10 to 95
The aliphatic polyester is contained in a ratio of 90 to 5 parts by weight based on the weight part.
本発明の組成物には、エチレン共重合体及び脂肪族ポリ
エステルのほか、本発明の目的を阻害しない限り、例え
ば、他の樹脂、ゴム、充填剤、着色剤、安定剤、分解促
進剤、香料、滑剤、ブロッキング防止剤、透明化剤、帯
電防止剤、接着性改良剤、印刷性改良剤等を含有させる
ことができる。In addition to the ethylene copolymer and aliphatic polyester, the composition of the present invention may contain, for example, other resins, rubbers, fillers, colorants, stabilizers, decomposition accelerators, and fragrances, as long as they do not impede the purpose of the present invention. , a lubricant, an antiblocking agent, a clarifying agent, an antistatic agent, an adhesion improver, a printability improver, and the like.
本発明の組成物は、このようなエチレン共重合体、脂肪
族ポリエステル等の所定量を、例えば、ロール、バンバ
リーミキサ−、ブラベンダープラストグラフ、押出し機
等の溶融混線機を使用し、常法により洛融混練して製造
することができる。The composition of the present invention can be prepared by adding a predetermined amount of such ethylene copolymer, aliphatic polyester, etc. using a melt mixing machine such as a roll, a Banbury mixer, a Brabender plastograph, or an extruder, using a conventional method. It can be produced by kneading and kneading.
また、本発明の組成物は、エチレン共重合体、脂肪族ポ
リエステル等の所定量を、成形機に投入−１直接、成形
体として得ることもてきる。The composition of the present invention can also be obtained as a molded article by directly charging a predetermined amount of ethylene copolymer, aliphatic polyester, etc. into a molding machine.
［発明の効果］ 本発明によると、以下に示す効果を奏する。[Effect of the invention] According to the present invention, the following effects are achieved.
↓エチレン共重合体と脂肪族ポリエステルとが相溶し、
非常に細かい均一な分散構造を形成するので、脂肪族ポ
リエステルが、土中の微生物によって比較的速（分解さ
れ、しかも脂肪族ポリエステルが抜けた跡が微細なボア
となるので、残ったエチレン共重合体の分解を促進する
ことができる。↓Ethylene copolymer and aliphatic polyester are compatible,
Because it forms a very fine and uniformly dispersed structure, the aliphatic polyester is decomposed relatively quickly (decomposed) by microorganisms in the soil, and the traces of the aliphatic polyester that have fallen out form minute pores, so the remaining ethylene copolymer It can promote the decomposition of coalescence.
■組成物は、一種のアロイであり、機械的強度が高い。■The composition is a type of alloy and has high mechanical strength.
［実施例］
エチレンと２−メチレン−１，３−ジオキソランまたは
２−メチレン−１，３−ジオキソランとを高圧ラジカル
重合させて下記のエチレン共重合体１及び２を得た。[Example] Ethylene and 2-methylene-1,3-dioxolane or 2-methylene-1,3-dioxolane were subjected to high-pressure radical polymerization to obtain the following ethylene copolymers 1 and 2.
エチレン共電ＡＩ
ＭＩ ： ５．６ｇ／１０分
数平均分子量（Ｍゎ）： １．５４Ｘ１０’重量平均分
子量（Ｍ、）： ５．４０Ｘ １０’工ステル結合して
いる２−メチレン−１，３−ジオキソランの濃度・３．
５モル％
エチレン共電Ａ体２
ＭＩ ： ６．０ｇ／ｌ、０分
数平均分子量（Ｍ、）：１．６６Ｘ１０’重量平均分子
量（Ｍ、）、５．５２ｘｌＯ’工ステル結合している２
−メチレン−１，３−ジオキソランの濃度 ２６モル％
（実施例１〜７）
エチレン共重合体１又は２と、第】表に示す脂肪酸ポリ
エステルの各々とをブラベンダープラストグラフを使用
して、第１表に示す割合で溶融混練し、本発明の組成物
を製造した。なお、第１表中、Ｅｌは、エチレン共重合
体１を示し、Ｅ２は、エチレン共重合体２を示し、ＰＣ
Ｌは、ポリカプロラクトン［平均分子量： ｔｏｏ、ｏ
ｏｏ、Ａｌｄｒｉｃｈ社製］を示し、Ｐ（３８Ｂ）は、
ポリ（３−ヒドロキシブチレート）［平均分子量８００
．０００、 （Ａｌｄｒｉｃｈ社製）］を示口重Ｐ（３
）−ｉ Ｂ ／ ３ ＨＶ ）は、３−ヒトロキシブチ
レトと３−ヒドロキシパリレートとの共重合体［３−ヒ
ドロキシパリレート濃度 ２０重量％平均分刊ｉ：８０
０．ｏｏｏ、（Ａｌｄｒｉｃｈ社製）］を示す。Ethylene Kyodo AI MI: 5.6g/10 fractional average molecular weight (Mゎ): 1.54X10' Weight average molecular weight (M,): 5.40X 10' ester bonded 2-methylene-1,3- Concentration of dioxolane・3.
5 mol% Ethylene co-electric A form 2 MI: 6.0 g/l, 0 fractional average molecular weight (M,): 1.66 x 10' weight average molecular weight (M, ), 5.52 x lO' ester bonded 2
- Concentration of methylene-1,3-dioxolane: 26 mol% (Examples 1 to 7) Ethylene copolymer 1 or 2 and each of the fatty acid polyesters shown in Table 1 were mixed using a Brabender plastograph. The compositions of the present invention were manufactured by melt-kneading them in the proportions shown in Table 1. In Table 1, El indicates ethylene copolymer 1, E2 indicates ethylene copolymer 2, and PC
L is polycaprolactone [average molecular weight: too, o
oo, manufactured by Aldrich], and P (38B) is
Poly(3-hydroxybutyrate) [average molecular weight 800
．． 000, (manufactured by Aldrich)]
)-i B/3 HV) is a copolymer of 3-hydroxybutyreto and 3-hydroxyparylate [3-hydroxyparylate concentration 20% by weight average fractional i: 80
0. ooo, (manufactured by Aldrich)].
次に、各実施例で得られた組成物のそれぞれを小型イン
フレーション成形機を使用して、厚みが約３０ｕｍのイ
ンフレーションフィルムを作製した。Next, a blown film having a thickness of about 30 um was produced from each of the compositions obtained in each example using a small-sized inflation molding machine.
得られたインフレーションフィルムについて、引張破断
点伸び試験（ＡＳＴＭ、Ｄ６３８）を行なって、本発明
の組成物の機械的強度を評価するとともに、以下にしめ
す土中埋設試験を行なって、本発明の組成物の分解性を
評価した。The obtained blown film was subjected to a tensile elongation at break test (ASTM, D638) to evaluate the mechanical strength of the composition of the present invention, and the following underground burial test was conducted to evaluate the composition of the present invention. The degradability of the material was evaluated.
その結果を第１表に示す。The results are shown in Table 1.
二上土星２■
得られたインフレーションフィルムを、畑の地表から３
０ｃｍの深さに埋設し、埋設時から３力月、６力月及び
１２力月後のフィルムの経時変化を観察した。なお組成
物の分解性の評価は、下記の基準で行なった。Nijo Saturn 2■ The obtained blown film was removed from the ground surface of the field.
The film was buried at a depth of 0 cm, and changes over time of the film were observed after 3 months, 6 months, and 12 months from the time of burial. Note that the degradability of the composition was evaluated based on the following criteria.
フィルムがバラバラに崩壊した・・・Ａフィルムにクラ
ックが発生した・・・Ｂフィルムの白濁化が進行した・
・・・Ｃフィルムに変化がなかった・・・・・Ｄ（七ヒ
較例 １〜６ ）
第１表に示す組成のプラスチックを実施例と同様にして
、厚みが約３０ｕｍのインフレーションフィルムを作製
し、実施例と同様にして、機械的強度及び分解性を評価
した。The film disintegrated into pieces... Cracks occurred in film A... Film B became cloudy.
...C There was no change in the film ...D (7 Comparative Examples 1 to 6) A blown film with a thickness of about 30 um was produced using plastic having the composition shown in Table 1 in the same manner as in the example. The mechanical strength and degradability were evaluated in the same manner as in the examples.
その結果を第１表に示す。The results are shown in Table 1.
なお、第１表中、ＨＰＬＤＰＥは、高圧ラジカル重合に
より得られたホモの低密度ポリエチレン［ＭＩ・５．３
ｇ／１０分、数平均分子量（Ｍ、）： １．７４Ｘ１０
’ 、重量平均分子量（ＩＶＬｗ）：５．８３ｘｌＯ’
］を示す。In Table 1, HPLDPE refers to homogeneous low-density polyethylene [MI 5.3] obtained by high-pressure radical polymerization.
g/10 min, number average molecular weight (M, ): 1.74X10
', Weight average molecular weight (IVLw): 5.83xlO'
].
（評価）
実施例で得られた組成物は、比較例で得られた組成物よ
り、破断点伸びが大きく、また分解（崩壊）が著しく速
かった。(Evaluation) The compositions obtained in the Examples had a larger elongation at break and decomposed (disintegrated) much faster than the compositions obtained in the Comparative Examples.
Claims (2)
次式（ I ）； ▲数式、化学式、表等があります▼（ I ） （式中、Ｒは、水素原子、メチル基又はエチル基を表わ
し、ｎは、１〜４の整数を表わす）で示される構造単位
を有する脂肪族ポリエステルとを、前者が１０〜９５重
量部に対し、後者を９０〜５重量部の割合で含有するこ
とを特徴とする分解性エチレン共重合体組成物。(1) Ethylene copolymer having an ester bond in the main chain and the following formula (I); ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, R is a hydrogen atom, a methyl group, or an ethyl group. and n represents an integer of 1 to 4), and the former contains 10 to 95 parts by weight, and the latter contains 90 to 5 parts by weight Characteristic degradable ethylene copolymer composition.
、エチレンと２−メチレン−１，３−ジオキセパンとの
共重合体であり、脂肪族ポリエステルが、３−ヒドロキ
シブチレートと３−ヒドロキシパリレートとの共重合体
、ポリカプロラクトン又はポリ（３−ヒドロキシブチレ
ート）である請求項１に記載の分解性エチレン共重合体
組成物。(2) The ethylene copolymer having an ester bond in the main chain is a copolymer of ethylene and 2-methylene-1,3-dioxepane, and the aliphatic polyester is a copolymer of 3-hydroxybutyrate and 3-hydroxyparylate. 2. The degradable ethylene copolymer composition according to claim 1, which is a copolymer with poly(3-hydroxybutyrate), polycaprolactone, or poly(3-hydroxybutyrate).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19476390A JPH0481450A (en) | 1990-07-25 | 1990-07-25 | Decomposable ethylene copolymer composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19476390A JPH0481450A (en) | 1990-07-25 | 1990-07-25 | Decomposable ethylene copolymer composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0481450A true JPH0481450A (en) | 1992-03-16 |
Family
ID=16329835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19476390A Pending JPH0481450A (en) | 1990-07-25 | 1990-07-25 | Decomposable ethylene copolymer composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0481450A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270411A (en) * | 1992-04-09 | 1993-12-14 | Quantum Chemical Corporation | Process for making an aliphatic polyester by copolymerizing a cyclic ketene acetal and an olefin and the polyester product thereof |
| US6041128A (en) * | 1994-01-31 | 2000-03-21 | Rion Kabushiki Kaisha | Battery receiving chamber and hearing aid |
| CN111303326A (en) * | 2020-04-09 | 2020-06-19 | 中国科学技术大学 | Polyolefin material with controllable degradation units and high monomer utilization rate and preparation method thereof |
-
1990
- 1990-07-25 JP JP19476390A patent/JPH0481450A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270411A (en) * | 1992-04-09 | 1993-12-14 | Quantum Chemical Corporation | Process for making an aliphatic polyester by copolymerizing a cyclic ketene acetal and an olefin and the polyester product thereof |
| US6041128A (en) * | 1994-01-31 | 2000-03-21 | Rion Kabushiki Kaisha | Battery receiving chamber and hearing aid |
| CN111303326A (en) * | 2020-04-09 | 2020-06-19 | 中国科学技术大学 | Polyolefin material with controllable degradation units and high monomer utilization rate and preparation method thereof |
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