JP3728698B2 - Polyester resin composition and polyester resin modifier - Google Patents
Polyester resin composition and polyester resin modifier Download PDFInfo
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- JP3728698B2 JP3728698B2 JP2004225300A JP2004225300A JP3728698B2 JP 3728698 B2 JP3728698 B2 JP 3728698B2 JP 2004225300 A JP2004225300 A JP 2004225300A JP 2004225300 A JP2004225300 A JP 2004225300A JP 3728698 B2 JP3728698 B2 JP 3728698B2
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Description
本発明は溶融粘度が改良されたポリエステル樹脂に関するものである。 The present invention relates to a polyester resin having an improved melt viscosity.
ポリエステル樹脂は溶融粘度が低いので、延伸工程を含まない押出し成形や射出成形では、溶融物が押出し成形機のダイスや射出成形機のノズルから自重で垂れ下がるドローダウン現象が起り、成形が非常に困難であった。そこでポリエステル樹脂は延伸工程が含まれる押出し成形や射出成形、あるいはブロー成形によって成形されており、そのために成形形状がフイルム状、繊維状、容器状に限られてしまうと云う問題がある。即ち延伸工程が含まれゝば、延伸力によってポリエステル樹脂の分子が配向して溶融粘度が高くなり、上記ドローダウン現象が起りにくゝなる。 Polyester resin has a low melt viscosity, so in extrusion molding and injection molding that does not include a drawing process, the melt is dripping down from the die of the extrusion molding machine or the nozzle of the injection molding machine due to its own weight, making molding very difficult. Met. Therefore, the polyester resin is molded by extrusion molding, injection molding or blow molding including a stretching process, and there is a problem that the molding shape is limited to a film shape, a fiber shape, and a container shape. That is, if the stretching step is included, the molecules of the polyester resin are oriented by the stretching force and the melt viscosity is increased, and the drawdown phenomenon is unlikely to occur.
最近では使用済のＰＥＴボトル等のポリエステル樹脂成形品スクラップの再生利用が関心の的となっているが、再生の際の熱処理によってポリエステル樹脂が低分子量化するので、溶融粘度はますます低くなり、上記問題はより深刻な状況となる。そして例え成形物が出来たとしても、低分子量化したポリエステル樹脂による成形物では機械的強度が劣化して、使用の上で大きな問題がある。 Recently, recycling of polyester resin molded product scraps such as used PET bottles has become a focus of interest, but since the polyester resin has a low molecular weight due to heat treatment during recycling, the melt viscosity becomes even lower. The above problem becomes a more serious situation. Even if a molded product can be produced, the molded product made of a polyester resin having a low molecular weight deteriorates the mechanical strength and has a serious problem in use.
〔従来の技術〕
従来、ポリエステル樹脂、特に再生ポリエステル樹脂の溶融粘度を高めるために、エポキシ基等のポリエステル樹脂と反応可能な官能基を有する樹脂を添加して高分子量化を図る手段が提案されている。
[Conventional technology]
Conventionally, in order to increase the melt viscosity of a polyester resin, particularly a recycled polyester resin, means for increasing the molecular weight by adding a resin having a functional group capable of reacting with a polyester resin such as an epoxy group has been proposed.
しかしこのような高分子量化手段では高分子量化に限度があり、特に再生ポリエステル樹脂では押出し成形に充分な溶融粘度が得られない、と云う問題点がある。 However, such a high molecular weight means has a limitation in high molecular weight, and in particular, there is a problem that a regenerated polyester resin cannot obtain a melt viscosity sufficient for extrusion molding.
本発明は上記従来の課題を解決するための手段として、ポリエステル樹脂と、ＪＩＳＫ７２１０表１条件４によるメルトフローレート（ＭＦＲ）が２０ g／１０分以下の増粘剤とからなり、該増粘剤はポリエチレンまたはエチレン−エチルアクリレート共重合体またはスチレン−エチレン−ブタジエンブロック共重合体であるポリエステル樹脂組成物を提供するものである。該増粘剤はポリエステル樹脂１００重量部に対して２〜５０重量部添加されていることが望ましい。特に再生ポリエステル樹脂の場合には、該ポリエステル樹脂と反応可能な官能基を有する高分子化剤を添加することが望ましい。また一般的に該高分子化剤の官能基はエポキシ基であることが望ましい。更に本発明は上記ポリエステル樹脂組成物を得るためのポリエステル樹脂改質剤であって、ＭＦＲが２０ g／１０分以下の増粘剤とポリエステル樹脂と反応可能な官能基を有する高分子化剤とを含有し、該増粘剤はポリエチレンまたはエチレン−エチルアクリレート共重合体またはスチレン−エチレン−ブタジエンブロック共重合体であるポリエステル樹脂改質剤を提供するものである。また該増粘剤と該高分子化剤とは６０：４０〜９０：１０重量比で混合されていることが望ましい。 The present invention as means for solving the conventional problems described above, consists of a polyester resin, melt flow rate according to JISK7210 Table 1 Condition 4 (MFR) is a 20 g / 10 minutes or less thickening agent, the thickening Provides a polyester resin composition which is a polyethylene, ethylene-ethyl acrylate copolymer or styrene-ethylene-butadiene block copolymer . The thickener is desirably added in an amount of 2 to 50 parts by weight with respect to 100 parts by weight of the polyester resin. Particularly in the case of a recycled polyester resin, it is desirable to add a polymerizing agent having a functional group capable of reacting with the polyester resin. In general, the functional group of the polymerizing agent is preferably an epoxy group. The present invention relates to a polyester resin modifier for obtaining the polyester resin composition, a polymerization agent MFR has a functional group capable of reacting with the 20 g / 10 minutes or less thickening agent and a polyester resin And the thickener provides a polyester resin modifier which is polyethylene or ethylene-ethyl acrylate copolymer or styrene-ethylene-butadiene block copolymer . The thickener and the polymerizing agent are desirably mixed in a weight ratio of 60:40 to 90:10.
〔作用・効果〕
ポリエステル樹脂の溶融粘度は上記本発明の増粘剤の添加によって改良される。特に低分子量化した再生ポリエステル樹脂の場合には更に高分子化剤を添加することによって溶融粘度は大巾に増大し、射出成形時におけるノズル先端からのポリエステル樹脂のドローダウン現象や押出成形時の成形品のドローダウン現象が防止され、射出成形性は良好に維持され、成形品の耐衝撃性も改良される。
したがって本発明では従来シート状、繊維状、容器状に限られていたポリエステル樹脂成形物を種々な形状に成形することが可能になる。
[Action / Effect]
The melt viscosity of the polyester resin is improved by the addition of the thickener of the present invention. In particular, in the case of recycled polyester resin having a low molecular weight, the addition of a polymerizing agent greatly increases the melt viscosity, and the polyester resin draw-down phenomenon from the nozzle tip during injection molding or during extrusion molding The drawdown phenomenon of the molded product is prevented, the injection moldability is maintained well, and the impact resistance of the molded product is improved.
Therefore, in the present invention, it is possible to form a polyester resin molded product, which has been conventionally limited to a sheet shape, a fiber shape, and a container shape, into various shapes.
本発明を以下に詳細に説明する。
〔ポリエステル樹脂〕
本発明のポリエステル樹脂とは、二価以上の多価アルコールと二価以上のカルボン酸とのエステル化反応によって得られる樹脂であり、例えばポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート等である。
本発明は特に再生ポリエステル樹脂に対して有用である。
The present invention is described in detail below.
[Polyester resin]
The polyester resin of the present invention is a resin obtained by an esterification reaction between a dihydric or higher polyhydric alcohol and a divalent or higher carboxylic acid, such as polyethylene terephthalate (PET) or polybutylene terephthalate.
The present invention is particularly useful for recycled polyester resins.
〔増粘剤〕
本発明の増粘剤はポリエステル樹脂の溶融粘度を増大せしめるものである。このような増粘剤としては、高溶融粘度を有する樹脂またはエラストマーが選択される。該増粘剤はポリエチレン、エチレン−エチルアクリレート共重合体（ＥＥＡ）、スチレン−エチレン−ブタジエンブロック共重合体（ＳＥＢＳ）である。
[Thickener]
The thickener of the present invention increases the melt viscosity of the polyester resin. As such a thickener, a resin or elastomer having a high melt viscosity is selected. The thickener port Riechire down, et styrene - butadiene block copolymer (SEB S) - ethyl acrylate copolymer (EE A), scan styrene - ethylene.
上記増粘剤のメルトフローレート（ＭＦＲ）はＪＩＳＫ７２１０表１条件４（試験温度１９０℃、試験荷重２１．１８（Ｎ））に準拠した測定方法により、０．５〜２０ g／１０分、望ましくは０．５〜１０ g／１０分、更に望ましくは０．５〜５ g／１０分であり、上記増粘剤は通常ポリエステル樹脂１００重量部に対して２〜５０重量部、望ましくは１０〜２０重量部添加される。上記増粘剤の添加量が２重量部に満たない場合には、増粘効果が顕著でなく、また５０重量部を超えると製品の剛性が低下するおそれがある。
本発明においては、上記増粘剤は単にポリエステル樹脂の溶融粘度を増大せしめるのみならず、耐熱性、耐衝撃性、寸法安定性、剛性等を改良するためにも添加されてもよい。
The melt flow rate (MFR) of the above thickener is desirably 0.5 to 20 g / 10 minutes, preferably by a measuring method in accordance with JIS K7210 Table 1 Condition 4 (test temperature 190 ° C., test load 21.18 (N)). Is 0.5 to 10 g / 10 min, more preferably 0.5 to 5 g / 10 min. The above thickener is usually 2 to 50 parts by weight, preferably 10 to 10 parts by weight based on 100 parts by weight of the polyester resin. 20 parts by weight are added. When the addition amount of the thickener is less than 2 parts by weight, the thickening effect is not remarkable, and when it exceeds 50 parts by weight, the rigidity of the product may be lowered.
In the present invention, the above thickener may be added not only to increase the melt viscosity of the polyester resin but also to improve heat resistance, impact resistance, dimensional stability, rigidity and the like.
〔高分子化剤〕
本発明において、特に再生ポリエステル樹脂のような低分子量化により溶融粘度が著しく低くなっている樹脂の場合には、高分子化剤を使用する。上記高分子化剤としてはポリエステル樹脂と反応する官能基を有する樹脂またはエラストマーを使用する。
上記ポリエステル樹脂と反応する官能基としては、例えばエポキシ基、カルボキシル基、イソシアネート基等があり、ポリエステル樹脂と高い反応性を有する点ではエポキシ基が望ましい。このような官能基を有する樹脂またはエラストマーとしてはエチレン−グリシジルメタクリレート（ＧＭＡ）共重合体、エチレン−アクリル酸共重合体、エチレン−ビニルイソシアネート共重合体等のエチレン系共重合体、上記エチレン系共重合体にスチレンをグラフト共重合せしめたポリスチレングラフトエチレン系共重合体、エポキシ基含有ＳＢＳ、エポキシ基含有ＳＥＢＳ、エポキシ基含有ＥＥＡ、カルボキシル基含有ＳＢＳ、カルボキシル基含有ＳＥＢＳ、カルボキシル基含有ＥＥＡ等である。また上記高分子化剤と増粘剤のソルビリティーパラメーターの差は１以内であることが望ましい。
[Polymerization agent]
In the present invention, a polymerizing agent is used particularly in the case of a resin whose melt viscosity is remarkably low due to the low molecular weight, such as a recycled polyester resin. As the polymerizing agent, a resin or elastomer having a functional group that reacts with a polyester resin is used.
Examples of the functional group that reacts with the polyester resin include an epoxy group, a carboxyl group, an isocyanate group, and the like, and an epoxy group is desirable in that it has high reactivity with the polyester resin. Examples of the resin or elastomer having such a functional group include ethylene-glycidyl methacrylate (GMA) copolymers, ethylene-acrylic acid copolymers, ethylene-based copolymers such as ethylene-vinyl isocyanate copolymers, and the above-mentioned ethylene-based copolymers. Polystyrene graft ethylene copolymer obtained by graft copolymerization of styrene with polymer, epoxy group-containing SBS, epoxy group-containing SEBS, epoxy group-containing EEA, carboxyl group-containing SBS, carboxyl group-containing SEBS, carboxyl group-containing EEA, etc. . Further, the difference in solubility parameter between the polymerizing agent and the thickener is desirably within 1 or less.
上記高分子化剤は使用される上記増粘剤と同種の骨格を有するものを選択することが望ましい。例えば増粘剤がポリエチレン、ＥＥＡの場合には、高分子化剤としてエチレン−グリシジルメタクリレート共重合体、エチレン−アクリル酸共重合体、エチレン−ビニルイソシアネート共重合体等のオレフィン系高分子化剤が選択され、増粘剤がＳＥＢＳの場合には、エポキシ基含有ＳＢＳあるいはＳＥＢＳ、カルボキシル基含有ＳＢＳあるいはＳＥＢＳ等のＳＢＳあるいはＳＥＢＳ系高分子化剤が選択される。上記高分子化剤はポリエステル樹脂１００重量部に対して通常０．１〜２０重量部好ましくは０．１〜１０重量部添加される。 The polymerizing agent is preferably selected from those having the same type of skeleton as the thickener used. For example thickeners polyethylene, in the case of EE A is ethylene as a polymer agent - glycidyl methacrylate copolymer, ethylene - acrylic acid copolymer, ethylene - vinyl isocyanate copolymer such as olefin polymerization agent is selected, and the thickener is in the case of S EBS is an epoxy group-containing SBS or SEBS, SBS or SEBS polymer agent such as a carboxyl group-containing SBS or SEBS is selected. The polymerizing agent is usually added in an amount of 0.1 to 20 parts by weight, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of the polyester resin.
〔ポリエステル樹脂改質剤〕
上記増粘剤と上記高分子化剤とを混合してポリエステル樹脂改質剤を調製しておいてもよい。この場合該増粘剤と該高分子化剤との混合比率は通常６０：４０〜９０：１０重量比とする。
[Polyester resin modifier]
A polyester resin modifier may be prepared by mixing the thickener and the polymerizing agent. In this case, the mixing ratio of the thickener and the polymerizing agent is usually 60:40 to 90:10 by weight.
〔その他の成分〕
本発明においては、更にポリエステル樹脂組成物の耐熱性、耐衝撃性、寸法安定性、剛性等を改良するために、例えばスチレン−イソプレンゴム（ＳＩＲ）、スチレン−エチレン共重合体、ポリ（α−メチルスチレン）−ポリブタジエン−ポリ（αメチルスチレン）共重合体（α−ＭｅＳ−Ｂ−α−ＭｅＳ）、ポリ（αメチルスチレン）−ポリイソプレン−ポリ（α−メチルスチレン）、ブタジエン−スチレン共重合体（ＢＳ）、エチレン−プロピレン−エチリデン共重合体、エチレン−酢酸ビニル共重合体、エチレン−ブテン−１共重合体、エチレン−プロピレン−エチルデンノルボルネン共重合体、エチレン−プロピレン−ジシクロペンタジエン共重合体、エチレン−プロピレン−１，４ヘキサジエン共重合体、エチレン−ブテン−１−エチリデンノルボルネン共重合体、エチレン−ブテン−１−ジシクロペンタジエン共重合体、エチレン−ブテン−１−１，４ヘキサジエン共重合体、アクリロニトリル−クロロプレン共重合体（ＮＣＲ）、スチレン−クロロプレン共重合体（ＳＣＲ）等の樹脂またはエラストマー、炭酸カルシウム、炭酸マグネシウム、硫酸バリウム、硫酸カルシウム、亜硫酸カルシウム、燐酸カルシウム、水酸化カルシウム、水酸化マグネシウム、水酸化アルミニウム、酸化マグネシウム、酸化チタン、酸化鉄、酸化亜鉛、アルミナ、シリカ、ケイ藻土、ドロマイト、石膏、タルク、クレー、アスベスト、マイカ、ガラス繊維、ケイ酸カルシウム、ベントナイト、ホワイトカーボン、カーボンブラック、鉄粉、アルミニウム粉、石粉、高炉スラグ、フライアッシュ、セメント、ジルコニア粉等の充填剤、難燃剤、酸化防止剤、老化防止剤、紫外線吸収剤、帯電防止剤、結晶化促進剤、発泡剤、染料、顔料等の着色剤等が添加されてもよい。上記成分は上記ポリエステル樹脂改質剤に添加しておいてもよい。
[Other ingredients]
In the present invention, in order to further improve the heat resistance, impact resistance, dimensional stability, rigidity and the like of the polyester resin composition, for example, styrene-isoprene rubber (SIR), styrene-ethylene copolymer, poly (α- Methylstyrene) -polybutadiene-poly (α-methylstyrene) copolymer (α-MeS-B-α-MeS), poly (α-methylstyrene) -polyisoprene-poly (α-methylstyrene), butadiene-styrene copolymer Copolymer (BS), ethylene-propylene-ethylidene copolymer, ethylene-vinyl acetate copolymer, ethylene-butene-1 copolymer, ethylene-propylene-ethyldennorbornene copolymer, ethylene-propylene-dicyclopentadiene copolymer Polymer, ethylene-propylene-1,4 hexadiene copolymer, ethylene-butene-1-ethyl Dennorbornene copolymer, ethylene-butene-1-dicyclopentadiene copolymer, ethylene-butene-1-1,4 hexadiene copolymer, acrylonitrile-chloroprene copolymer (NCR), styrene-chloroprene copolymer ( SCR) resin or elastomer, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, Alumina, silica, diatomaceous earth, dolomite, gypsum, talc, clay, asbestos, mica, glass fiber, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, fly assy Even if fillers such as cement and zirconia powder, flame retardants, antioxidants, anti-aging agents, UV absorbers, antistatic agents, crystallization accelerators, foaming agents, dyes, pigments, etc. are added. Good. The above components may be added to the polyester resin modifier.
〔配合〕
上記成分の混合方法はドライブレンドが望ましく、特に増粘剤と高分子化剤との混合物をペレット化し、該ペレットにポリエステル樹脂の粉砕物、特にフレーク状の粉砕物を混合して射出成形することが望ましい。
[Combination]
The blending method of the above components is preferably dry blending. In particular, a mixture of a thickener and a polymerizing agent is pelletized, and a polyester resin pulverized product, particularly a flaky pulverized product, is mixed with the pellet and injection molded. Is desirable.
〔実施例１〕（新規ポリエステル樹脂）
ジカルボン酸単位がテレフタル酸１００モル％、ジオール単位がエチレングリコール９８モル％、ジエチレングリコール２モル％から得られ、エチレンテレフタレート単位が全構成繰返し単位の９８モル％を占めるポリエチレンテレフタレート樹脂（ＰＥＴ）を使用し、表１の配合で増粘剤Ａ（低密度ポリエチレン（ＬＤＰＥ）：ＭＦＲ４．０ g／１０分）、をドライブレンドし、東洋精機社製キャピログラフを使用し、ダイス径１mm、測定温度２７０℃、予熱時間３００秒の条件で溶融粘度を測定し、更にバレル温度２６０〜２７０℃、金型温度：型面２５〜３５℃、射出圧力約１０００ kgf／cm2 の条件で射出成形して１７５mm×１２．７mm、肉厚４mmのプレートを作成し、更に該プレートを加工して６４mm×１２．７mm、ノッチ深さ２．５４mmの試験片（ＪＩＳＫ７１１０）を作成し、耐衝撃性を測定した。その結果を表１に示す。
[Example 1] (New polyester resin)
A polyethylene terephthalate resin (PET) is used in which the dicarboxylic acid unit is 100 mol% of terephthalic acid, the diol unit is 98 mol% of ethylene glycol, and 2 mol% of diethylene glycol. In Table 1, the thickener A (low density polyethylene (LDPE): MFR 4.0 g / 10 min) was dry blended, using a Capillograph manufactured by Toyo Seiki Co., Ltd., with a die diameter of 1 mm, a measurement temperature of 270 ° C., The melt viscosity was measured under a preheating time of 300 seconds, and injection molded under the conditions of a barrel temperature of 260 to 270 ° C., a mold temperature of 25 to 35 ° C., and an injection pressure of about 1000 kgf / cm 2 175 mm × 12 A plate with a thickness of 7 mm and a wall thickness of 4 mm was prepared, and the plate was further processed to have a size of 64 mm × 12.7 mm and a notch depth of 2.54 mm. A test piece (JISK7110) was prepared and the impact resistance was measured. The results are shown in Table 1.
表１をみると、増粘剤の添加によってＰＥＴの溶融粘度Ａは押出成形時にドローダウン現象を起さない５０００Ｐoise以上に増大し、耐衝撃性も向上していることが認められる。 Table 1 shows that the addition of a thickener increases the melt viscosity A of PET to 5000 Poise or higher, which does not cause a drawdown phenomenon during extrusion molding, and also improves the impact resistance.
〔実施例２〕（再生ポリエステル樹脂）
ペットボトル廃品粉砕物を使用し、表２の配合で増粘剤Ａ、増粘剤Ｂ（ＥＥＡ，ＭＦＲ０．６ g／１０分）、増粘剤Ｃ（ＳＥＢＳ，ＭＦＲ２．３ g／１０分）および高分子化剤Ａ（エポキシ基含有ＳＢＳ）、高分子化剤Ｂ（スチレングラフトエチレン−ＧＭＡ共重合体）、高分子化剤Ｃ（エチレン−ＧＭＡ共重合体）をドライブレンドし、実施例１と同様な条件で射出成形して同様な試験片を作成し、実施例１と同様に物性を測定した。その結果を表２に示す。
[Example 2] (Recycled polyester resin)
Thickener A, Thickener B (EEA, MFR 0.6 g / 10 min), Thickener C (SEBS, MFR 2.3 g / 10 min) with the composition of Table 2 using crushed plastic bottles And a polymerizing agent A (epoxy group-containing SBS), a polymerizing agent B (styrene-grafted ethylene-GMA copolymer), and a polymerizing agent C (ethylene-GMA copolymer) were dry-blended. The same test piece was prepared by injection molding under the same conditions as in Example 1, and the physical properties were measured in the same manner as in Example 1. The results are shown in Table 2.
表２をみると、増粘剤と高分子化剤の添加によって、低分子量化している再生ポリエステル樹脂であっても溶融粘度Ａは増大し、かつ耐衝撃性も大巾に向上していることが認められる。
上記試料１，２，４について剪断速度を種々に変更して溶融粘度を測定した。その結果を表３および図１に示す。
Table 2 shows that the melt viscosity A is increased and the impact resistance is greatly improved even with a recycled polyester resin having a low molecular weight due to the addition of a thickener and a polymerizing agent. Is recognized.
The melt viscosity was measured for the
表３および図１に示す結果によれば、本発明の試料Ｎｏ２，４は剪断速度が０に近い状態で無添加再生ＰＥＴである試料Ｎｏ１よりもいづれもはるかに高い溶融粘度を示し、射出成形時におけるノズル先端からのポリエステル樹脂のドローダウン現象が防止される。
また押出成形時の剪断速度に対応する１０2 Ｓec-1近辺の剪断速度の場合でも、試料Ｎｏ２，４は試料Ｎｏ１よりもいづれも高く、押出成形時の成形品のドローダウン現象が防止され、異形成形が可能であることが予測される。
即ち試料Ｎｏ２，４の場合は押出成形機によって押出した際、径が安定してストランドが順調に得られるが、試料Ｎｏ１ではストランド径が一定せず、小径部分でちぎれてしまう。
According to the results shown in Table 3 and FIG. 1, Samples Nos. 2 and 4 of the present invention showed a much higher melt viscosity than Sample No. 1 which is additive-free recycled PET with a shear rate close to 0, and injection molding. The drawdown phenomenon of the polyester resin from the nozzle tip at the time is prevented.
Further, even in the case of a shear rate in the vicinity of 10 2 Sec −1 corresponding to the shear rate at the time of extrusion molding, Sample Nos. 2 and 4 are both higher than Sample No. 1, and the drawdown phenomenon of the molded product at the time of extrusion molding is prevented. It is expected that dysmorphism is possible.
That is, in the case of sample Nos. 2 and 4, when extruded by an extruder, the diameter is stabilized and the strand is obtained smoothly, but in sample No. 1, the strand diameter is not constant and the small diameter part is broken.
一方射出成形時の剪断速度に対応する１０3 Ｓec-1以上の剪断速度では、試料Ｎｏ２，４の溶融粘度はいづれも試料Ｎｏ１の溶融粘度に近づき、射出成形性が良好であることが予測される。 On the other hand, at a shear rate of 10 3 Sec −1 or higher corresponding to the shear rate at the time of injection molding, the melt viscosities of Samples Nos. 2 and 4 are both close to the melt viscosity of Sample No. 1 and it is predicted that the injection moldability is good. The
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