JPH0931256A - Ethylene-based resin composition for injection molding and injection molding product - Google Patents
Ethylene-based resin composition for injection molding and injection molding productInfo
- Publication number
- JPH0931256A JPH0931256A JP18705095A JP18705095A JPH0931256A JP H0931256 A JPH0931256 A JP H0931256A JP 18705095 A JP18705095 A JP 18705095A JP 18705095 A JP18705095 A JP 18705095A JP H0931256 A JPH0931256 A JP H0931256A
- Authority
- JP
- Japan
- Prior art keywords
- injection molding
- resin composition
- ethylene
- injection
- density polyethylene
- 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
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、射出成形用エチレ
ン系樹脂組成物及び射出成形体に関するものである。更
に詳しくは、本発明は、射出成形性、耐熱性、強度及び
外観を十分に満足し得る水準に維持し、かつ透明性を大
きく改良した射出成形用エチレン系樹脂組成物及び該樹
脂組成物を射出成形して得られる射出成形体に関するも
のである。TECHNICAL FIELD The present invention relates to an ethylene resin composition for injection molding and an injection molded article. More specifically, the present invention provides an injection-molding ethylene-based resin composition and a resin composition in which injection moldability, heat resistance, strength, and appearance are maintained at sufficiently satisfactory levels and transparency is greatly improved. The present invention relates to an injection molded body obtained by injection molding.
【0002】[0002]
【従来の技術】従来、エチレン−α−オレフィン共重合
体は、寸法精度及び光沢に優れる性質を利用し、バン
ド、電線などの保護カバー、キャップ、パッキン、バケ
ツ、箱などの射出成形品に使用されている。しかしなが
ら、従来のエチレン−α−オレフィン共重合体は透明性
に劣るという問題点があった。2. Description of the Related Art Conventionally, ethylene-α-olefin copolymers have been used for injection molded products such as protective covers for bands and electric wires, caps, packings, buckets, boxes, etc., due to their excellent dimensional accuracy and luster. Has been done. However, the conventional ethylene-α-olefin copolymer has a problem of poor transparency.
【0003】[0003]
【発明が解決しようとする課題】かかる現状に鑑み、本
発明が解決しようとする課題は、射出成形性、耐熱性、
強度及び外観を十分に満足し得る水準に維持し、かつ透
明性を大きく改良した射出成形用エチレン系樹脂組成物
及び該樹脂組成物を射出成形して得られる射出成形体を
提供する点に存するものである。In view of the present situation, the problems to be solved by the present invention include injection moldability, heat resistance,
It is an object to provide an ethylene resin composition for injection molding in which the strength and appearance are maintained at a sufficiently satisfactory level and the transparency is greatly improved, and an injection molded article obtained by injection molding the resin composition. It is a thing.
【0004】[0004]
【課題を解決するための手段】すなわち、本発明のうち
第一の発明は、下記(A)90〜99.5重量%及び
(B)0.5〜10重量%からなる射出成形用エチレン
系樹脂組成物に係るものである。 (A):メルトフローレートが1〜100g/10分で
あり、かつ密度が0.910〜0.950g/cm3 で
あるエチレン−α−オレフィン共重合体 (B):高密度ポリエチレンにガンマー線を照射線量1
0〜80キログレイ照射して得られ、かつゲル分率が1
5重量%以下であるガンマー線照射高密度ポリエチレンThat is, the first invention of the present invention is an injection molding ethylene system comprising the following (A) 90 to 99.5% by weight and (B) 0.5 to 10% by weight. It relates to a resin composition. (A): ethylene-α-olefin copolymer having a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910 to 0.950 g / cm 3 (B): high density polyethylene and gamma rays Irradiation dose 1
Obtained by irradiating from 0 to 80 kilogray and having a gel fraction of 1
Gamma-irradiated high density polyethylene which is less than 5% by weight
【0005】また、本発明のうち第二の発明は上記の樹
脂組成物を射出成形して得られる射出成形体に係るもの
である。A second aspect of the present invention relates to an injection molded article obtained by injection molding the above resin composition.
【0006】本発明の(A)は、メルトフローレートが
1〜100g/10分であり、かつ密度が0.910〜
0.950g/cm3 であるエチレン−α−オレフィン
共重合体である。The (A) of the present invention has a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910.
It is an ethylene-α-olefin copolymer having 0.950 g / cm 3 .
【0007】(A)のα−オレフィンとしては、プロピ
レン、ブテン−1、4−メチルペンテン−1、ヘキセン
−1、オクテン−1、デセン−1などが用いられるが、
炭素数3〜10のものが好ましい。なお、これらのα−
オレフィンは、その一種を単独で用いても、二種以上を
併用してもよい。As the α-olefin of (A), propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1 and the like are used.
Those having 3 to 10 carbon atoms are preferable. Note that these α-
The olefins may be used alone or in combination of two or more.
【0008】(A)のメルトフローレートは1〜100
g/10分、好ましくは2〜70g/10分である。メ
ルトフローレートが過小であると射出成形性に劣り、一
方メルトフローレートが過大であると強度に劣る。な
お、メルトフローレートは、JIS−K7210に従
い、温度190℃、荷重2.16kgで測定した値であ
る。The melt flow rate of (A) is 1-100.
g / 10 minutes, preferably 2-70 g / 10 minutes. If the melt flow rate is too low, the injection moldability will be poor, while if the melt flow rate is too high, the strength will be poor. The melt flow rate is a value measured at a temperature of 190 ° C. and a load of 2.16 kg according to JIS-K7210.
【0009】(A)の密度は0.910〜0.950g
/cm3 、好ましくは0.910〜0.940g/cm
3 である。密度が過小であると耐熱性に劣り、一方密度
が過大であると透明性に対する改良効果が不十分とな
る。The density of (A) is 0.910 to 0.950 g.
/ Cm 3 , preferably 0.910 to 0.940 g / cm
Is 3 . If the density is too low, the heat resistance will be poor, while if the density is too high, the effect of improving transparency will be insufficient.
【0010】(A)は、遷移金属触媒を用い、溶媒の存
在下又は不存在下、気−固、液−固又は均一液相下、エ
チレンとα−オレフィンとを重合させることにより得ら
れる。通常の重合反応条件は、温度30〜300℃、圧
力常圧〜3000kg/cm 2 である。(A) uses a transition metal catalyst and uses a solvent.
In the presence or absence of gas-solid, liquid-solid or homogeneous liquid phase,
Obtained by polymerizing ethylene and α-olefin.
It is. Normal polymerization reaction conditions include a temperature of 30 to 300 ° C. and a pressure.
Normal pressure ~ 3000 kg / cm TwoIt is.
【0011】本発明の(B)は、高密度ポリエチレンに
ガンマー線を照射線量10〜80キログレイ照射して得
られ、かつゲル分率が15重量%以下であるガンマー線
照射高密度ポリエチレンである。(B) of the present invention is a gamma-ray-irradiated high-density polyethylene obtained by irradiating a high-density polyethylene with a gamma-ray irradiation dose of 10 to 80 kilograys and having a gel fraction of 15% by weight or less.
【0012】ガンマー線照射に付される高密度ポリエチ
レンは、エチレンの単独重合体又はエチレンとα−オレ
フィンの共重合体である。α−オレフィンとしては、プ
ロピレン、ブテン−1、4−メチルペンテン−1、ヘキ
セン−1、オクテン−1、デセン−1などが用いられる
が、炭素数3〜10のものが好ましい。なお、これらの
α−オレフィンは、その一種を単独で用いても、二種以
上を併用してもよい。The high-density polyethylene subjected to gamma irradiation is a homopolymer of ethylene or a copolymer of ethylene and α-olefin. As the α-olefin, propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1 and the like are used, but those having 3 to 10 carbon atoms are preferable. These α-olefins may be used alone or in combination of two or more.
【0013】高密度ポリエチレンの密度は、通常0.9
42〜0.970g/cm3 、好ましくは0.945〜
0.965g/cm3 である。該密度が過小であると透
明性に対する改良効果が不十分となる。The density of high density polyethylene is usually 0.9.
42 to 0.970 g / cm 3 , preferably 0.945 to
It is 0.965 g / cm 3 . If the density is too low, the effect of improving transparency becomes insufficient.
【0014】高密度ポリエチレンは、遷移金属触媒を用
い、溶媒の存在下又は不存在下、気−固、液−固又は均
一液相下、エチレン又はエチレンとα−オレフィンを重
合させることにより得られる。通常の重合反応条件は、
温度30〜300℃、圧力常圧〜300kg/cm2 で
ある。The high-density polyethylene is obtained by polymerizing ethylene or ethylene and an α-olefin in the presence or absence of a solvent and in a gas-solid, liquid-solid or homogeneous liquid phase using a transition metal catalyst. . Normal polymerization reaction conditions are:
The temperature is 30 to 300 ° C. and the pressure is normal pressure to 300 kg / cm 2 .
【0015】本発明の(B)は、上記の高密度ポリエチ
レンにガンマー線を照射線量10〜80キログレイ、好
ましくは15〜70キログレイ照射して得られる。照射
線量が過少であると透明性に対する改良効果が不十分と
なり、一方照射線量が過多であると成形品の表面にスジ
やブツが発生し、その外観を悪化させる。(B) of the present invention can be obtained by irradiating the above-mentioned high-density polyethylene with gamma rays at an irradiation dose of 10 to 80 kilogray, preferably 15 to 70 kilogray. If the irradiation dose is too low, the effect of improving transparency will be insufficient, while if the irradiation dose is too high, streaks or spots will be generated on the surface of the molded product and the appearance will be deteriorated.
【0016】ガンマー線源としては、通常コバルト60
が使用される。ポリエチレンなどのポリオレフィンにガ
ンマー線を照射することにより架橋を行う技術は公知
(たとえば、篠原、柏原共著「新物理学進歩シリーズ1
0 放射線と高分子」槙書店1968、及び、A.チャ
ルスビー著「放射線と高分子」朝倉書店 1962)で
あり、本発明においても公知の方法を用いることができ
る。As a gamma ray source, usually cobalt 60
Is used. Techniques for cross-linking polyolefins such as polyethylene by irradiating them with gamma rays are known (see Shinohara and Kashihara “New Physics Advancement Series 1”).
0 Radiation and Polymers, ”Maki Shoten 1968, and A. Charsby, "Radiation and Polymer", Asakura Shoten 1962), and known methods can be used in the present invention.
【0017】(B)は、そのゲル分率が15重量%以
下、好ましくは10重量%以下である必要がある。ゲル
分率が過多であると成形品の表面にスジやブツが発生
し、外観に劣る。なお、ゲル分率の測定法は、実施例の
項で説明する。The gel fraction of (B) must be 15% by weight or less, preferably 10% by weight or less. If the gel fraction is too high, streaks or spots will be generated on the surface of the molded product, resulting in poor appearance. The method for measuring the gel fraction will be described in the section of Examples.
【0018】本発明においては、(A)と(B)のメル
トフローレートの比((A)/(B))が50未満であ
ることが良好な分散性を得る観点から好ましい。該比が
過大であると分散性が悪化し、成形品の表面にスジやブ
ツなどが発生し、外観に劣る場合がある。なお、メルト
フローレートは、温度190℃、荷重2.16kgで測
定される。In the present invention, the ratio ((A) / (B)) of the melt flow rates of (A) and (B) is preferably less than 50 from the viewpoint of obtaining good dispersibility. If the ratio is too large, the dispersibility may be deteriorated, and streaks or spots may be generated on the surface of the molded product, resulting in poor appearance. The melt flow rate is measured at a temperature of 190 ° C. and a load of 2.16 kg.
【0019】本発明の樹脂組成物は、(A)90〜9
9.5重量%及び(B)0.5〜10重量%からなり、
好ましくは(A)92〜99.5重量%及び(B)0.
5〜8重量%からなる。(A)が過少(すなわち、
(B)が過多)であると強度に劣る。一方、(A)が過
多(すなわち、(B)が過少)であると透明性の改良効
果が不十分となる。なお、樹脂組成物には、必須成分で
ある(A)及び(B)に加えて、適宜使用し得る成分と
して、中和剤、分散剤、酸化防止剤、滑剤、耐候性改良
剤、帯電防止剤、顔料、フィラーなどを含有させてもよ
い。The resin composition of the present invention comprises (A) 90-9
9.5 wt% and (B) 0.5-10 wt%,
Preferably (A) 92-99.5% by weight and (B) 0.
It consists of 5 to 8% by weight. (A) is too small (that is,
If (B) is too large, the strength is poor. On the other hand, if the amount of (A) is too large (that is, the amount of (B) is too small), the effect of improving transparency becomes insufficient. In the resin composition, in addition to the essential components (A) and (B), components that can be used appropriately include neutralizing agents, dispersants, antioxidants, lubricants, weather resistance improvers, and antistatic agents. Agents, pigments, fillers, etc. may be contained.
【0020】樹脂組成物を得るためのブレンド方法とし
ては、通常の混合操作、たとえばタンブラーブレンダー
法、ヘンシェルミキサー法、バンバリーミキサー法、押
出造粒法などをあげることができる。Examples of the blending method for obtaining the resin composition include ordinary mixing operations such as a tumbler blender method, a Henschel mixer method, a Banbury mixer method and an extrusion granulation method.
【0021】本発明の樹脂組成物は、射出成形性、耐熱
性、強度及び外観を十分に満足し得る水準に維持し、か
つ透明性を大きく改良したものであり、射出成形用途に
最適に使用し得る。The resin composition of the present invention maintains the injection moldability, heat resistance, strength and appearance at a level that can be sufficiently satisfied, and has greatly improved transparency, and is optimally used for injection molding applications. You can
【0022】射出成形の方法としては、特に制限はな
く、シリンダー内で樹脂組成物を溶融可塑化し、金型内
に射出、冷却することにより成形される成形法であれば
どのような成形法でもよい。可塑化方式はプランジャー
式及びインラインスクリュー式のいずれでもよく、型締
め方式としては直圧式、トグル式、ウエッジ式及びそれ
らの複合型のいずれでもよい。通常のスプルーランナー
システムの他にホットランナーシステム、ランナレスシ
ステムといった特殊なシステムを用いてもよい。ゲート
は一点式、多点式、スリット状のものでもよく、又、ピ
ンポイントノズルを用いて成形してもよい。製品形状か
らは、大型成形、小型成形、原肉成形、薄肉成形いずれ
でもよい。また、多色成形、サンドイッチ成形、ガスア
シスト射出成形といった特殊な成形法を用いてもよい。
更に、予め金属など他の材質、ラベルや装触材を金型内
にセットしておいて成形するインモールド成形やインサ
ート成形、射出成形後、連続的にブロー成形を行なうイ
ンジェクションブロー成形、射出時あるいは射出完了後
に金型を移動、圧縮するいわゆるプレスモールド法によ
り成形してもよい。The injection molding method is not particularly limited, and any molding method can be used as long as it is a method in which the resin composition is melted and plasticized in a cylinder, injected into a mold and cooled to be molded. Good. The plasticizing method may be a plunger type or an in-line screw type, and the mold clamping method may be a direct pressure type, a toggle type, a wedge type or a combination type thereof. In addition to the normal sprue runner system, a special system such as a hot runner system or a runnerless system may be used. The gate may be a one-point type, a multi-point type, a slit type, or may be formed by using a pinpoint nozzle. Depending on the product shape, any of large-sized molding, small-sized molding, raw-wall molding, and thin-wall molding may be used. Further, a special molding method such as multicolor molding, sandwich molding, gas-assisted injection molding may be used.
In addition, other materials such as metal, labels and touch materials are set in the mold and molded in-mold or insert-molded, injection-molded and then continuously blow-molded. Alternatively, it may be molded by a so-called press molding method in which the mold is moved and compressed after the injection is completed.
【0023】本発明の射出成形品の具体例としては、束
ねバンド、電線などの保護カバー、ヒンジ付キャップ、
プルタブ付キャップ、ノズルキャップなどのキャップ、
シール蓋、パッキン、バケツ、箱などをあげることがで
きる。Specific examples of the injection-molded article of the present invention include a binding band, a protective cover for electric wires, a cap with a hinge,
Cap with pull tab, cap such as nozzle cap,
Examples include seal lids, packing, buckets, boxes, etc.
【0024】[0024]
【実施例】以下、実施例により本発明を説明する。 実施例1〜7及び比較例1〜7 表1〜2に示す成分を30mm径のスクリューを有する
押出機にて200℃で造粒し、評価を行なった。結果を
表1〜2に示した。The present invention will be described below with reference to examples. Examples 1 to 7 and Comparative Examples 1 to 7 The components shown in Tables 1 and 2 were granulated at 200 ° C. with an extruder having a screw with a diameter of 30 mm, and evaluated. The results are shown in Tables 1 and 2.
【0025】測定・評価方法は次の通りである。 (1)メルトフローレート(MFR) JIS−K7210に従い、温度190℃、荷重2.1
6kgで測定した。 (2)密度 150℃で厚さ1mmにプレス成形したシートを使用
し、JIS−K6760により測定した。 (3)ゲル分率 測定試料を100メッシュの網篭に入れ、その状態で沸
騰キシレン中に投入し、6時間還流操作を行った。網篭
中に残存したゲルは風乾した後、真空乾燥させた。そし
て抽出したゲルの重量を測定し、以下の式に基づきゲル
分率(重量%)を算出した。 ゲル分率=(ゲル重量/全試料重量)×100 (4)Haze(透明性) 射出成形機(東芝機械社製 商品名「IS−100E
N」)を使用し、射出圧力800kg/cm2 、シリン
ダー温度200℃、金型温度40℃、成形サイクル40
秒の条件下、15cm角×1.5cm厚さの射出成形品
を得た。該成形品について、ASTM D1003に準
拠してHazeを測定した。 (5)表面外観 Haze測定用に得た射出成形品について、その表面の
ブツの存在について目視観察し、○(ブツやスジがな
く、表面外観に優れる。)と×(ブツやスジがあり、表
面外観に劣る。)で評価した。The measurement / evaluation methods are as follows. (1) Melt Flow Rate (MFR) According to JIS-K7210, temperature 190 ° C., load 2.1.
It was measured at 6 kg. (2) Density Using a sheet press-molded to a thickness of 1 mm at 150 ° C., the sheet was measured according to JIS-K6760. (3) Gel Fraction A measurement sample was placed in a 100-mesh basket, and in that state, it was placed in boiling xylene and refluxed for 6 hours. The gel remaining in the basket was air dried and then vacuum dried. Then, the weight of the extracted gel was measured, and the gel fraction (% by weight) was calculated based on the following formula. Gel fraction = (gel weight / total sample weight) × 100 (4) Haze (transparency) injection molding machine (manufactured by Toshiba Machine Co., Ltd., trade name “IS-100E”)
N ”), injection pressure 800 kg / cm 2 , cylinder temperature 200 ° C., mold temperature 40 ° C., molding cycle 40
Under the condition of seconds, an injection molded product of 15 cm square × 1.5 cm thickness was obtained. Haze of the molded product was measured according to ASTM D1003. (5) Surface Appearance The injection-molded product obtained for Haze measurement was visually observed for the presence of spots on the surface, and ○ (no spots or streaks, excellent surface appearance) and × (spots or streaks were observed, The surface appearance is inferior.)
【0026】結果から次のことがわかる。本発明の条件
を充足するすべての実施例は、すべての評価項目におい
て満足すべき結果を示している。一方、(B)を用いな
かった比較例1〜3及び6は透明性に劣る。また、ゲル
分率が過多の(B)を用いた比較例4及び5は表面外観
に劣る。更に、密度が過大な(A)を用いた比較例7は
透明性に劣る。The results show the following. All examples satisfying the conditions of the present invention show satisfactory results in all evaluation items. On the other hand, Comparative Examples 1 to 3 and 6 not using (B) are inferior in transparency. Further, Comparative Examples 4 and 5 using (B) having an excessive gel fraction are inferior in surface appearance. Furthermore, Comparative Example 7 using (A) having an excessively high density is inferior in transparency.
【0027】[0027]
【表1】 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 実 施 例 1 2 3 4 5 6 7 配合 (A) 種類 *1 A1 ← ← A2 A3 A1 ← MFR g/10分 20 ← ← 3 20 20 ← 密度 g/cm 3 0.920 ← ← 0.935 0.920 0.920 ← 量 wt% 99 97 94 97 97 97 97 (B) γ線照射前 種類 *2 B1 ← ← ← ← ← B2 MFR g/10分 40 ← ← ← ← ← 7 密度 g/cm 3 0.962 ← ← ← ← ← 0.951 γ線照射量 kGy *3 50 ← ← ← ← 25 25 γ線照射後 ゲル分率 wt% 0 0 0 0 0 0 7 MFR g/10分 4.3 ← ← ← ← 13 0.6 量 wt% 1 3 6 3 3 3 3 MFR(A)/MFR(B) 4.7 ← ← 0.7 4.7 1.5 33 評価 Haze % 79 69 64 70 68 80 75 表面外観 ○ ○ ○ ○ ○ ○ ○ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−[Table 1] ----------------------- Example 1 2 3 4 5 6 7 Formulation (A) Type * 1 A1 ← ← A2 A3 A1 ← MFR g / 10 min 20 ← ← 3 20 20 ← density g / cm 3 0.920 ← ← 0.935 0.920 0.920 ← amount wt% 99 97 94 97 97 97 97 (B) Before γ-ray irradiation * 2 B1 ← ← ← ← ← B2 MFR g / 10 min 40 ← ← ← ← ← 7 Density g / cm 3 0.962 ← ← ← ← ← 0.951 γ-ray dose kGy * 3 50 ← ← ← ← ← 25 25 After gamma irradiation Gel fraction wt% 0 0 0 0 0 0 7 MFR g / 10 min 4.3 ← ← ← ← 13 0.6 Amount wt% 1 3 6 3 3 3 3 MFR (A) / MFR (B) 4.7 ← ← 0.7 4.7 1.5 33 Evaluation Haze% 79 69 64 70 68 80 75 Surface appearance ○ ○ ○ ○ ○ ○ ○ −−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−
【0028】[0028]
【表2】 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 比 較 例 1 2 3 4 5 6 7 配合 (A) 種類 *1 A1 A2 A3 A1 ← A4 ← MFR g/10分 20 3 20 20 ← 5 ← 密度 g/cm 3 0.919 0.935 0.920 0.920 ← 0.964 ← 量 wt% 100 100 100 97 ← 100 97 (B) γ線照射前 種類 *2 - - - B1 B2 - B1 MFR g/10分 - - - 40 7 - 40 密度 g/cm 3 - - - 0.962 0.951 - 0.962 γ線照射量 kGy *3 - - - 100 50 - 50 γ線照射後 ゲル分率 wt% - - - 30 33 - 0 MFR g/10分 - - - 0.043 0.055 - 4.3 量 wt% - - - 3 3 - 3 MFR(A)/MFR(B) - - - 465 364 - 1.2 評価 Haze % 89 92 89 82 79 96 95 表面外観 ○ ○ ○ × × ○ ○ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−[Table 2] ------------------------------------------ Ratio Comparative Example 1 2 3 4 5 6 7 Formulation (A) Type * 1 A1 A2 A3 A1 ← A4 ← MFR g / 10 min 20 3 20 20 ← 5 ← Density g / cm 3 0.919 0.935 0.920 0.920 ← 0.964 ← Amount wt% 100 100 100 97 ← 100 97 (B ) Before gamma irradiation * 2---B1 B2-B1 MFR g / 10 min---40 7-40 Density g / cm 3 ---0.962 0.951-0.962 Gamma irradiation dose kGy * 3---100 50-50 Gel fraction after gamma irradiation wt%---30 33-0 MFR g / 10 min---0.043 0.055-4.3 Amount wt%---3 3-3 MFR (A) / MFR (B) ---465 364-1.2 Evaluation Haze% 89 92 89 82 79 96 95 Surface appearance ○ ○ ○ × × ○ ○ −−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−
【0029】*1 (A)の種類 A1:エチレン−ブテン−1共重合体(ブテン−1含量
=7重量%) A2:エチレン−ブテン−1共重合体(ブテン−1含量
=3重量%) A3:エチレン−ヘキセン−1共重合体(ヘキセン−1
含量=10重量%) A4:高密度ポリエチレン(丸善ポリマー社製 ケミレ
ッツ−HD 2050) *2 (B)の高密度ポリエチレンの種類 B1:旭化成工業社製 サンテック J300 B2:丸善ポリマー社製 ケミレッツ−HD 1070 *3 γ線(ガンマー線)の照射方法:コバルト60の
ガンマー線照射室内において、照射する高密度ポリエチ
レンペレットの荷姿が25kgの紙袋に対し、室温、空
気雰囲気下で照射した。照射量の単位「kGy」はキロ
グレイを意味する。* 1 Type of (A) A1: ethylene-butene-1 copolymer (butene-1 content = 7% by weight) A2: ethylene-butene-1 copolymer (butene-1 content = 3% by weight) A3: ethylene-hexene-1 copolymer (hexene-1
Content = 10% by weight) A4: High-density polyethylene (Chemilets-HD 2050 manufactured by Maruzen Polymer Co., Ltd.) * 2 Type of high-density polyethylene of (B) B1: Suntech J300 B2 manufactured by Asahi Kasei Kogyo Co., Ltd. Chemillets-HD 1070 manufactured by Maruzen Polymer Co., Ltd. * 3 γ-ray (gamma-ray) irradiation method: In a gamma-ray irradiation chamber of Cobalt 60, a paper bag of high-density polyethylene pellets to be irradiated was irradiated at room temperature and in an air atmosphere. The unit of dose "kGy" means kilogray.
【0030】[0030]
【発明の効果】以上説明したとおり、本発明により、射
出成形性、耐熱性、強度及び外観を十分に満足し得る水
準に維持し、かつ透明性を大きく改良した射出成形用エ
チレン系樹脂組成物及び該樹脂組成物を射出成形して得
られる射出成形体を提供することができた。Industrial Applicability As described above, according to the present invention, an ethylene resin composition for injection molding, in which the injection moldability, heat resistance, strength and appearance are maintained at sufficiently satisfactory levels and the transparency is greatly improved. It was possible to provide an injection-molded article obtained by injection-molding the resin composition.
Claims (2)
(B)0.5〜10重量%からなる射出成形用エチレン
系樹脂組成物。 (A):メルトフローレートが1〜100g/10分で
あり、かつ密度が0.910〜0.950g/cm3 で
あるエチレン−α−オレフィン共重合体 (B):高密度ポリエチレンにガンマー線を照射線量1
0〜80キログレイ照射して得られ、かつゲル分率が1
5重量%以下であるガンマー線照射高密度ポリエチレン1. An ethylene resin composition for injection molding comprising 90 to 99.5% by weight of the following (A) and 0.5 to 10% by weight of (B). (A): ethylene-α-olefin copolymer having a melt flow rate of 1 to 100 g / 10 minutes and a density of 0.910 to 0.950 g / cm 3 (B): high density polyethylene and gamma rays Irradiation dose 1
Obtained by irradiating from 0 to 80 kilogray and having a gel fraction of 1
Gamma-irradiated high density polyethylene which is less than 5% by weight
て得られる射出成形体。2. An injection-molded article obtained by injection-molding the resin composition according to claim 1.
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JP18705095A JP3557731B2 (en) | 1995-07-24 | 1995-07-24 | Ethylene resin composition for injection molding and injection molded article |
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JP18705095A JP3557731B2 (en) | 1995-07-24 | 1995-07-24 | Ethylene resin composition for injection molding and injection molded article |
Publications (2)
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JPH0931256A true JPH0931256A (en) | 1997-02-04 |
JP3557731B2 JP3557731B2 (en) | 2004-08-25 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013100552A (en) * | 2013-02-26 | 2013-05-23 | Mitsubishi Chemicals Corp | Method for producing crystalline thermoplastic resin composition |
JP2017513777A (en) * | 2014-03-06 | 2017-06-01 | ノヴァ ケミカルズ(アンテルナショナル)ソシエテ アノニム | Radiation-crosslinked polyethylene hinge |
-
1995
- 1995-07-24 JP JP18705095A patent/JP3557731B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013100552A (en) * | 2013-02-26 | 2013-05-23 | Mitsubishi Chemicals Corp | Method for producing crystalline thermoplastic resin composition |
JP2017513777A (en) * | 2014-03-06 | 2017-06-01 | ノヴァ ケミカルズ(アンテルナショナル)ソシエテ アノニム | Radiation-crosslinked polyethylene hinge |
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JP3557731B2 (en) | 2004-08-25 |
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