JP2012180491A - Resin composition - Google Patents
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- JP2012180491A JP2012180491A JP2011046105A JP2011046105A JP2012180491A JP 2012180491 A JP2012180491 A JP 2012180491A JP 2011046105 A JP2011046105 A JP 2011046105A JP 2011046105 A JP2011046105 A JP 2011046105A JP 2012180491 A JP2012180491 A JP 2012180491A
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- 239000011342 resin composition Substances 0.000 title claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 20
- 229920001577 copolymer Polymers 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 14
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000005977 Ethylene Substances 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 229920001567 vinyl ester resin Polymers 0.000 claims abstract description 7
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 6
- 229920001038 ethylene copolymer Polymers 0.000 claims description 24
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 14
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 14
- 150000001735 carboxylic acids Chemical class 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 7
- 150000001732 carboxylic acid derivatives Chemical class 0.000 abstract description 3
- 229920002678 cellulose Polymers 0.000 description 20
- 239000001913 cellulose Substances 0.000 description 20
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 5
- 239000005022 packaging material Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 229920006026 co-polymeric resin Polymers 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 2
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000251555 Tunicata Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005903 acid hydrolysis reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
本発明は、樹脂組成物に関するものであり、特に、セルロース系高分子が分散されたエチレン系共重合体からなる樹脂組成物に関する。 The present invention relates to a resin composition, and in particular, to a resin composition made of an ethylene copolymer in which a cellulosic polymer is dispersed.
エチレン系共重合体樹脂は、適度な柔軟性と、優れた機械的特性及び成形性により、各種容器、包装材料に広く使用されている。 Ethylene-based copolymer resins are widely used in various containers and packaging materials due to their moderate flexibility and excellent mechanical properties and moldability.
エチレン系共重合体樹脂の機械的特性を向上させる為、様々な充填剤や添加剤の配合が検討され、利用されているが、環境負荷、リサイクル性などの観点から、共重合体樹脂使用量の低減化、充填剤や添加剤の環境対応が望まれている。 In order to improve the mechanical properties of ethylene-based copolymer resins, various fillers and additives have been studied and used, but from the viewpoint of environmental impact and recyclability, the amount of copolymer resin used It is desired to reduce the environmental impact of fillers and additives.
一方、セルロースは、強度に優れると共に、地上に存在するバイオマスの約５割を占めるほぼ無尽蔵に存在する資源であり、その生産と廃棄過程に環境破壊を伴わずに持続的発展を実現する材料である事からも、エチレン系共重合体樹脂の機械的特性を向上させる充填剤としての利用が検討されている。 Cellulose, on the other hand, has excellent strength and is an almost inexhaustible resource that accounts for about 50% of the biomass on the ground. It is a material that realizes sustainable development without environmental destruction in its production and disposal processes. For some reason, the use as a filler for improving the mechanical properties of the ethylene copolymer resin has been studied.
例えば、特開昭６１−２２５２３４号、及び特公平７−７２２３７号では、繊維化されたセルロースを主体とする植物繊維を配合してなるポリオレフィン系樹脂組成物が提案されている。
しかしながら、上記組成物で用いられた繊維化されたセルロースを主成分とした植物繊維は、古紙、紙屑などを解繊して繊維化したものであり、その平均粒子径が大きいために、機械的特性を向上させるには不十分である。
For example, JP-A-61-225234 and JP-B-7-72237 propose a polyolefin-based resin composition containing a vegetable fiber mainly composed of fiberized cellulose.
However, the plant fiber mainly composed of fiberized cellulose used in the above composition is a fiber obtained by defibrating waste paper, paper waste, etc., and its average particle size is large, so that it is mechanical. It is insufficient to improve the characteristics.
本発明は、上記に鑑み、機械的特性に優れる樹脂組成物を提供することを目的とする。 In view of the above, an object of the present invention is to provide a resin composition having excellent mechanical properties.
本発明者は、エチレン系共重合体に平均粒子径が３μｍ以上２０μｍ以下である、微細なセルロース系高分子を凝集すること無く分散させると、機械的特性が飛躍的に向上する事を発見し、本発明を完成するに至った。 The present inventor has discovered that when a fine cellulose polymer having an average particle diameter of 3 μm or more and 20 μm or less is dispersed in an ethylene copolymer without agglomeration, the mechanical properties are dramatically improved. The present invention has been completed.
すなわち、本発明は、
［１］ エチレン由来の重合単位と、ビニルエステル、不飽和カルボン酸、及びそれらの誘導体からなる群から選ばれる少なくとも１種の共重合化合物由来の重合単位とを含むエチレン系共重合体であって、エチレン系共重合体に対する共重合化合物由来の重合単位の割合が５〜５０重量％であるエチレン系共重合体に、平均粒子径が３μｍ以上２０μｍ以下であるセルロース系高分子が、エチレン系共重合体１００重量部に対して１０〜４００重量部の割合で分散されている樹脂組成物、
［２］ エチレン系共重合体がエチレン−酢酸ビニル共重合体である、上記［１］に記載の樹脂組成物、
である。
That is, the present invention
[1] An ethylene-based copolymer comprising a polymerized unit derived from ethylene and a polymerized unit derived from at least one copolymer compound selected from the group consisting of vinyl esters, unsaturated carboxylic acids, and derivatives thereof. The cellulose polymer having an average particle diameter of 3 μm or more and 20 μm or less is added to the ethylene copolymer in which the ratio of the polymerization unit derived from the copolymer compound to the ethylene copolymer is 5 to 50% by weight. A resin composition dispersed in a proportion of 10 to 400 parts by weight with respect to 100 parts by weight of the polymer;
[2] The resin composition according to the above [1], wherein the ethylene copolymer is an ethylene-vinyl acetate copolymer,
It is.
本発明によれば、加重時の変形により中身が損なわれる恐れのある各種容器、及び加重時の伸び変形が生じない高い剛性が求められる包装材に好適に用いられる樹脂組成物を提供することができる。 According to the present invention, it is possible to provide a resin composition that can be suitably used for various containers whose contents may be damaged due to deformation under load, and packaging materials that require high rigidity without causing elongation deformation under load. it can.
以下、本発明を詳細に説明する。
本発明の樹脂組成物は、エチレンと、５〜５０重量％の、ビニルエステル、不飽和カルボン及びそれらの誘導体からなる群から選ばれる少なくとも１種とを共重合して得られるエチレン系共重合体に、平均粒子径が３μｍ以上２０μｍ以下のセルロース系高分子が、エチレン系共重合体１００重量部に対して１０〜４００重量部の割合で分散されている樹脂組成物である。
本発明のエチレン系共重合体は、エチレンと、ビニルエステル、不飽和カルボン酸又はそれらの誘導体から選ばれる少なくとも１種とを共重合した共重合体である。ここで、ビニルエステル、不飽和カルボン酸及びそれらの誘導体のことを共重合化合物と称することにする。エチレン系共重合体の例としては、エチレン−酢酸ビニル共重合体（以下、ＥＶＡと記す。）、エチレン−アクリル酸共重合体（以下、ＥＡＡと記す。）、エチレン−メタクリル酸共重合体（以下、ＥＭＡＡと記す。）、エチレン−アクリル酸メチル共重合体（以下、ＥＭＡと記す。）、エチレン−アクリル酸エチル共重合体（以下、ＥＥＡと記す。）、エチレン−メタクリル酸エチル共重合体（以下、ＥＭＭＡと記す。）が挙げられる。この中でもＥＶＡがセルロースの分散性と発現する物性の観点から、好ましい。共重合化合物であるビニルエステル、不飽和カルボン酸及びそれらの誘導体由来の重合単位が、エチレン系共重合体に含まれる割合（含有率）は５〜５０重量％が好ましく、１０〜３５重量％であるとより好ましい。５重量％以上であればセルロースの分散が良好になり、５０重量％以下であれば樹脂が過度に柔軟にならず、材料として好ましい。
Hereinafter, the present invention will be described in detail.
The resin composition of the present invention is an ethylene copolymer obtained by copolymerizing ethylene and 5 to 50% by weight of at least one selected from the group consisting of vinyl esters, unsaturated carboxylic acids and derivatives thereof. In addition, a cellulose polymer having an average particle size of 3 μm or more and 20 μm or less is dispersed in a ratio of 10 to 400 parts by weight with respect to 100 parts by weight of the ethylene copolymer.
The ethylene-based copolymer of the present invention is a copolymer obtained by copolymerizing ethylene and at least one selected from vinyl esters, unsaturated carboxylic acids or derivatives thereof. Here, vinyl ester, unsaturated carboxylic acid, and derivatives thereof will be referred to as a copolymer compound. Examples of the ethylene copolymer include an ethylene-vinyl acetate copolymer (hereinafter referred to as EVA), an ethylene-acrylic acid copolymer (hereinafter referred to as EAA), an ethylene-methacrylic acid copolymer ( Hereafter referred to as EMAA), ethylene-methyl acrylate copolymer (hereinafter referred to as EMA), ethylene-ethyl acrylate copolymer (hereinafter referred to as EEA), ethylene-ethyl methacrylate copolymer (Hereinafter referred to as EMMA). Among these, EVA is preferable from the viewpoint of the dispersibility of cellulose and the physical properties to be expressed. The proportion (content) of the copolymerized compound derived from vinyl ester, unsaturated carboxylic acid and derivatives thereof in the ethylene copolymer is preferably 5 to 50% by weight, and 10 to 35% by weight. More preferably. If it is 5% by weight or more, the dispersion of cellulose is good, and if it is 50% by weight or less, the resin is not excessively flexible and is preferable as a material.
また、本発明で使用されるエチレン系共重合体のメルトマスフローレイト（ＭＦＲ、ＪＩＳ−Ｋ−７２１０：１９９９、１９０℃、荷重２．１６ｋｇ）は、０．１〜１００ｇ／１０ｍｉｎが好ましく、より好ましくは１．０〜１００ｇ／１０ｍｉｎである。０．１ｇ／１０ｍｉｎ以上では、セルロースの混合分散がしやすくなると共に、良好な流動性により成形加工がしやすくなる。１００ｇ／１０ｍｉｎ以下では、分子量が小さくなりすぎず、良好な機械的特性が得られる。 Further, the melt mass flow rate (MFR, JIS-K-7210: 1999, 190 ° C., load 2.16 kg) of the ethylene copolymer used in the present invention is preferably 0.1 to 100 g / 10 min, more preferably. Is 1.0 to 100 g / 10 min. If it is 0.1 g / 10 min or more, it becomes easy to mix and disperse cellulose, and it becomes easy to perform molding processing due to good fluidity. If it is 100 g / 10 min or less, the molecular weight does not become too small, and good mechanical properties can be obtained.
エチレン系共重合体の重合方法は、高圧法、中低圧法等の公知の方法により行なうことができる。また、エチレン系共重合体の一次構造はランダム、ブロックなど、いずれの構造の共重合体も使用することができる。 The polymerization method of the ethylene copolymer can be performed by a known method such as a high-pressure method or a medium-low pressure method. The primary structure of the ethylene copolymer may be a copolymer having any structure such as random or block.
本発明のセルロース系高分子は、ホモポリマー、その誘導体又はそれらの混合物からなり、具体的には、木材パルプおよび／または非木材パルプおよび／またはバクテリアおよび／または藻類および／またはホヤ由来のセルロースからなる。セルロース系高分子は通常、硫酸や塩酸などの酸を用いた酸加水分解による化学的方法、もしくは高圧ホモジナイザー、リファイナー、グラインダー、ボールミル、ロッドミル、石臼などの機械的エネルギーを与えて、セルロースの解繊や微細化を行う物理的方法によって得られるが、これらに限定されるものではない。また、化学的、物理的方法による処理を施した市販のセルロース系高分子を利用することもできる。上記の処理によって、セルロース系高分子は最終的に平均粒子径が通常３μｍ以上２０μｍ以下に調整される。平均粒子径が２０μｍ以下であれば、得られる樹脂組成物の機械的強伸度が改良され、３μｍ以上では粉砕に多くのエネルギーが必要になることはなく、また再凝集が起こりにくいため実用的である。 The cellulosic polymer of the present invention is composed of a homopolymer, a derivative thereof or a mixture thereof, specifically, wood pulp and / or non-wood pulp and / or bacteria and / or algae and / or sea squirt-derived cellulose. Become. Cellulosic polymers are usually subjected to chemical methods by acid hydrolysis using acids such as sulfuric acid and hydrochloric acid, or mechanical energy such as high-pressure homogenizers, refiners, grinders, ball mills, rod mills, stone mills, etc. However, the present invention is not limited to these. Commercially available cellulosic polymers that have been treated by chemical and physical methods can also be used. By the above treatment, the cellulosic polymer is finally adjusted to an average particle size of usually 3 μm or more and 20 μm or less. If the average particle size is 20 μm or less, the mechanical strength of the resulting resin composition is improved, and if it is 3 μm or more, a large amount of energy is not required for pulverization, and reaggregation hardly occurs. It is.
本発明の樹脂組成物は、エチレン系共重合体に対し、セルロース系高分子を分散させた組成物である。エチレン系共重合体とセルロース系高分子の割合は、エチレン系共重合体１００重量部に対し、通常１０重量部〜４００重量部であり、好ましくは３０重量部〜３００重量部である。１０重量部以上では機械的強度が改良され、４００重量部以下では、良好な分散状態を得ることができ、好ましい。 The resin composition of the present invention is a composition in which a cellulosic polymer is dispersed in an ethylene copolymer. The ratio of the ethylene copolymer and the cellulose polymer is usually 10 parts by weight to 400 parts by weight, preferably 30 parts by weight to 300 parts by weight with respect to 100 parts by weight of the ethylene copolymer. If it is 10 parts by weight or more, the mechanical strength is improved, and if it is 400 parts by weight or less, a good dispersion state can be obtained, which is preferable.
本発明は、エチレン系共重合体に平均粒子径が通常３μｍ以上２０μｍ以下、好ましくは５〜１５μｍのセルロース系高分子を凝集すること無く分散させる。分散方法は、ＥＶＡ等のエチレン系共重合体をミキサー、二軸押出機等を用いて溶融混練しながらセルロース系高分子を添加する方法や、エチレン系共重合体を溶解した溶液を撹拌しながらセルロース系高分子を加える方法等が適用できるが、分散性を向上させる為に、セルロース系高分子をトルエンなどの有機溶剤と接触させ、ボールミルで破砕する等の力学的処理を施した後で、エチレン系共重合体と混合することが望ましい。 In the present invention, a cellulose polymer having an average particle size of usually 3 μm or more and 20 μm or less, preferably 5 to 15 μm, is dispersed in an ethylene copolymer without agglomeration. A dispersion method includes a method of adding a cellulose polymer while melt-kneading an ethylene copolymer such as EVA using a mixer, a twin screw extruder, or the like, while stirring a solution in which the ethylene copolymer is dissolved. A method of adding a cellulosic polymer can be applied, but in order to improve dispersibility, the cellulosic polymer is brought into contact with an organic solvent such as toluene and subjected to a mechanical treatment such as crushing with a ball mill. It is desirable to mix with an ethylene copolymer.
また、本発明の樹脂組成物には必要に応じて酸化防止剤、耐光安定剤、紫外線吸収剤、帯電防止剤、滑剤、アンチブロッキング剤、難燃剤、防曇剤、顔料、染料、オイル、ワックス、分散剤、発泡剤等を本発明の目的を損なわない範囲で適時配合することができる。 In addition, the resin composition of the present invention includes an antioxidant, a light stabilizer, an ultraviolet absorber, an antistatic agent, a lubricant, an antiblocking agent, a flame retardant, an antifogging agent, a pigment, a dye, an oil, and a wax as necessary. In addition, a dispersant, a foaming agent, and the like can be blended in a timely manner as long as the object of the present invention is not impaired.
本発明について、以下実施例を用いて具体的に説明する。尚、物性測定方法、評価方法は以下の通りである。
（１）平均粒子径測定
（株）島津製作所製、レーザー回折式粒度分布測定装置：ＳＡＬＤ２０００Ｊを用いて、セルロース微粒子を水に分散させた状態で測定し、積算値５０％の粒度を平均粒子径とした。
（２）セルロース分散状態
日立製作所（株）製、走査型電子顕微鏡：Ｓ−４８００を用いてセルロースの分散状態を観察した。
（３）弾性率、破断強度、破断伸び
島津製作所製、引張・圧縮材料試験機：ＥＺ Ｔｅｓｔ ＳＭ−５００Ｎ−１６８を用いて、引張試験を実施した時の応力−歪み曲線から算出した。
The present invention will be specifically described below with reference to examples. The physical property measurement method and evaluation method are as follows.
(1) Average particle diameter measurement Laser diffraction particle size distribution measuring device manufactured by Shimadzu Corporation: measured with SALD2000J in a state where cellulose fine particles are dispersed in water, and an average particle diameter of 50% of integrated value is measured. It was.
(2) Cellulose dispersion state The dispersion state of cellulose was observed using a scanning electron microscope: S-4800 manufactured by Hitachi, Ltd.
(3) Elastic modulus, rupture strength, rupture elongation Using a tensile / compressed material tester manufactured by Shimadzu Corporation: EZ Test SM-500N-168, calculation was performed from a stress-strain curve when a tensile test was performed.
［実施例１〜４］
エチレン系共重合体として、酢酸ビニル含有量１５重量％、ＭＦＲ＝３のエチレン−酢酸ビニル共重合体（ＥＶＡ−１）、酢酸ビニル含有量３０重量％、ＭＦＲ＝３０エチレン−酢酸ビニル共重合体（ＥＶＡ−２）、及びセルロース系高分子として、平均粒子径５．９μｍのＷｈａｔｍａｎ社製のＣＦ１１（Ｃｅｌｌ−１）を用いて、表１に示す配合で調製した樹脂組成物によりフィルムを作製し、物性を評価した。樹脂組成物の調製は、トルエンを含浸させた状態でボールミルにより微細化したセルロース系高分子を、トルエンにＥＶＡを１００℃で溶解した溶液に加え、攪拌し、セルロース／ＥＶＡ混合溶液を得た後、得られた混合溶液を常温まで冷却した。その後、アセトンを加えて析出した沈殿物をろ過分離し、真空乾燥して樹脂組成物を得た。得られた樹脂組成物を（株）東洋精機製作所製ラボプラストミルμを用いて１６０℃で溶融混練した後、（株）東洋精機製作所製ミニテストプレスＭＰ−２Ｆを用いてフィルムを作製し、弾性率を測定した。評価結果を表１に併せて示す。
[Examples 1 to 4]
As an ethylene-based copolymer, an ethylene-vinyl acetate copolymer (EVA-1) having a vinyl acetate content of 15% by weight and MFR = 3, a vinyl acetate content of 30% by weight, and an MFR = 30 ethylene-vinyl acetate copolymer (EVA-2) and as a cellulose polymer, using CF11 (Cell-1) manufactured by Whatman having an average particle diameter of 5.9 μm, a film was prepared using a resin composition prepared with the formulation shown in Table 1. The physical properties were evaluated. The resin composition was prepared by adding a cellulose polymer refined by a ball mill in a state impregnated with toluene to a solution of EVA dissolved in toluene at 100 ° C. and stirring to obtain a cellulose / EVA mixed solution. The obtained mixed solution was cooled to room temperature. Thereafter, acetone was added and the deposited precipitate was separated by filtration and dried in vacuo to obtain a resin composition. After melt-kneading the obtained resin composition at 160 ° C. using a lab plast mill μ manufactured by Toyo Seiki Seisakusho, a film was prepared using a mini test press MP-2F manufactured by Toyo Seiki Seisakusho, The elastic modulus was measured. The evaluation results are also shown in Table 1.
［比較例１］
エチレン系共重合体として、酢酸ビニル含有量３重量％のエチレン−酢酸ビニル共重合体（ＥＶＡ−３）を用いた以外は実施例１と同様にして樹脂組成物を作製し、物性を評価した。配合と評価結果を表２に併せて示す。
[Comparative Example 1]
A resin composition was prepared in the same manner as in Example 1 except that an ethylene-vinyl acetate copolymer (EVA-3) having a vinyl acetate content of 3% by weight was used as the ethylene copolymer, and the physical properties were evaluated. . The formulation and evaluation results are also shown in Table 2.
［比較例２］
セルロース系高分子として、新聞紙をミキサーで解繊した植物繊維（平均粒子径５２μｍ、Ｃｅｌｌ−２）を用いた以外は実施例１と同様にして樹脂組成物を作製し、物性を評価した。配合と評価結果を表２に併せて示す。
Resin compositions were prepared and evaluated for physical properties in the same manner as in Example 1 except that plant fibers (average particle size 52 μm, Cell-2) obtained by defibrating newspaper with a mixer were used as the cellulose polymer. The formulation and evaluation results are also shown in Table 2.
本発明の樹脂組成物は、各種容器、包装材料、例えば、射出成形容器、ブロー成形容器、インフレフィルムからなる包装材料、キャストフィルムからなる包装材料に好適に用いることができる。 The resin composition of the present invention can be suitably used for various containers and packaging materials, for example, injection molded containers, blow molded containers, packaging materials composed of inflation films, and packaging materials composed of cast films.
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