JPH032890B2 - - Google Patents
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- Publication number
- JPH032890B2 JPH032890B2 JP5176582A JP5176582A JPH032890B2 JP H032890 B2 JPH032890 B2 JP H032890B2 JP 5176582 A JP5176582 A JP 5176582A JP 5176582 A JP5176582 A JP 5176582A JP H032890 B2 JPH032890 B2 JP H032890B2
- Authority
- JP
- Japan
- Prior art keywords
- resin particles
- particles
- present
- expanded particles
- weight
- 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.)
- Expired
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- 239000002245 particle Substances 0.000 claims description 75
- 229920005989 resin Polymers 0.000 claims description 54
- 239000011347 resin Substances 0.000 claims description 54
- -1 Polypropylene Polymers 0.000 claims description 19
- 239000004743 Polypropylene Substances 0.000 claims description 17
- 229920001155 polypropylene Polymers 0.000 claims description 17
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000002612 dispersion medium Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 239000000454 talc Substances 0.000 claims description 5
- 229910052623 talc Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
本発明は球状ポリプロピレン系樹脂粒子の製造
方法に関する。
従来より発泡成型体は、ポリスチレン、架橋ポ
リエチレンを材質として例えば予備発泡粒子を用
いるビーズ成型法等により製造されている。一
方、本出願人はポリプロピレン系樹脂が機械的強
度、耐熱性、耐薬品性、耐油性等が優れているこ
とからその発泡成型体の開発の研究を進めた結
果、予備発泡粒子を得る方法およびその予備発泡
粒子を用いて発泡成型体を得る方法の開発に成功
し、すでに堤案している。
しかしながら、ポリスチレンが懸濁重合法によ
り、またポリエチレンが架橋工程により球状の樹
脂粒子を得ることができ、その樹脂粒子を用いて
得られる予備発泡粒子が球状となるのに対し、ポ
リプロピレン系樹脂の場合には、無架橋の樹脂粒
子を用いて予備発泡粒子が得られる反面、得られ
る予備発泡粒子は均一な球状のものが得られ難
く、その予備発泡粒子は成形用金型に効率的に充
填し難いため均一な発泡成型体を得られ難い点で
未だ改良の余地を残しているものである。
本発明は上記従来技術の欠点を解消した球状ポ
リプロピレン系樹脂粒子の製造方法を提供するこ
とを目的とするものであつて、本発明者らは、上
記目的を達成すべく鋭意研究した結果、樹脂粒子
を、塩基性炭酸マグネシウム、タルクまたは酸化
アルミニウムあるいはそれらの混合物からなる分
散剤を用いて分散剤に分散した後樹脂粒子の融点
＋10℃以上の温度に加熱することによつて球状の
ポリプロピレン系樹脂が得られることを見出し、
本発明を完成するに至つた。
すなわち、本発明はポリプロピレン系樹脂粒子
を、該樹脂粒子100重量部に対して塩基性炭酸マ
グネシウム、タルク、酸化アルミニウムの１種ま
たは２種以上からなる分散剤0.4重量部以上を用
いて分散媒に分散し、上記樹脂粒子の融点＋10℃
以上の温度に加熱することを特徴とする球状ポリ
プロピレン系樹脂粒子の製造方法を要旨とするも
のである。
本発明においてポリプロピレン系樹脂粒子の材
質としては、例えばプロピレン単独重合体、エチ
レン−プロピレンランダム共重合体、エチレン−
プロピレンブロツク共重合体等が挙げられ、これ
らは単独または混合して用いることができるが、
エチレン−プロピレンランダム共重合体が特に好
ましい。また、ポリプロピレン系樹脂粒子は押出
機によりペレツト化したもの、粉砕機にて粉砕し
たもの等を用いることができ、その形状はどのよ
うなものでもよいが、この樹脂粒子の重量は６
mg／個以下、好ましくは５mg／個以下が好まし
い。
本発明において、用いることができる分散剤
は、塩基性炭酸マグネシウム、タルクまたは酸化
アルミニウムのうちの１種またはそれらの２種以
上の混合物である。この分散剤はポリプロピレン
系樹脂粒子100重量部に対し0.4重量部以上用い
る。分散剤の添加量が0.4重量部未満の場合には、
本発明の目的である樹脂粒子の球形化が期待でき
ない。また分散剤として、前記したもの以外のも
の例えば、塩基性炭酸亜鉛、リン酸カルシウム、
及び炭酸カルシウム等を使用しても球形化の効果
は全く望めない。但し、これらの分散剤も本発明
の効果を阻害しない範囲で添加することは妨げる
ものでない。また樹脂粒子が分散される分散媒と
しては、例えば水、エチレングリコール、グリセ
リン、メタノール、エタノール等のうちの１種ま
たはそれらの２種以上の混合物等が挙げられるが
通常は水が好ましい。分散媒の使用量は通常樹脂
粒子100重量部に対し100重量部以上である。
本発明において、樹脂粒子は該樹脂粒子の融点
＋10℃以上の温度、好ましくは融点＋12℃以上か
ら融点＋50℃以下の温度に加熱される。加熱温度
が融点＋10℃未満の場合には樹脂粒子の球形化が
困難であり、本発明の目的を達成することができ
ない。また加熱温度が所望の温度に到達した後15
分以上保持することが好ましい。
本発明において、樹脂粒子の融点の測定は示差
走査熱量分析（DSC）によつて行なつた。この
測定法では、試料セツト後窒素雰囲気にて10℃／
分の速度で200℃まで昇温し、その後10℃／分で
50℃まで降温し、再度10℃／分で昇温したときの
融解ピークの頂点を融点とし、ピークが複数の場
合はその平均温度を融点とした。
本発明により得られる球状ポリプロピレン系樹
脂粒子は、例えば当該樹脂の予備発泡粒子の製造
に有効に用いることができる。この予備発泡粒子
の製造方法は例えば、密閉容器内に樹脂粒子、揮
発性発泡剤、分散媒を入れ、撹拌下、所定温度に
昇温し、容器内の圧力を揮発性発泡剤の蒸気圧以
上または以下の圧力に保持しながら容器の一端を
開放し、樹脂粒子と分散媒とを同時に容器内より
低圧の雰囲気に放出することにより行なわれる。
このようにして得られる予備発泡粒子は粒子形状
のバラツキが少なく、また気泡性（気泡数）のバ
ラツキも少ないものである。また予備発泡粒子製
造時には、通常、分散剤が用いられ、予備発泡粒
子を得た後そこに付着した分散剤を洗浄除去して
いるが、本発明により得られる樹脂粒子を用いれ
ば、予備発泡粒子を洗浄する必要はなく、また予
備発泡粒子製造時、密閉容器内に残留する樹脂粒
子も非常に少なくなる。
また上記のようにして得られた予備発泡粒子を
用いて発泡成型体を得ることができ、この予備発
泡粒子の形状は均一なので成型用金型に効率的に
充填でき、また気泡径のバラツキも少ないので均
一な優れた物性を有する発泡成型体を得ることが
できる。
以上説明したように本発明によれば、塩基性炭
酸マグネシウム、タルク、酸化アルミニウムの１
種または２種以上からなる分散剤を樹脂粒子100
重量部に対して0.4重量部以上を用いて樹脂粒子
の融点＋10℃以上の温度に樹脂粒子を加熱するこ
とにより球状の樹脂粒子を得ることができ、この
球状の樹脂粒子を例えば予備発泡粒子の製造に用
いた場合、形状、気泡径等が均一な予備発泡粒子
を得ることができ、さらにはこの予備発泡粒子を
用いて得られる発泡成型体は優れた物性を有する
ものである等の利点を有するものである。
以下、実施例および比較例を掲げて本発明をさ
らに詳細に説明する。
実施例１〜９および比較例１〜３
５のオートクレーブに第１表に示すポリプロ
ピレン系樹脂粒子、分散剤および水を入れ、撹拌
下、153〜180℃の温度に加熱して１時間保持し
た。得られた樹脂粒子の形状を観察した。尚、本
実施例及び比較例で使用するポリプロピレン系樹
脂の融点は以下の通りである。
ポリプロピレン系樹脂 融点（℃）
プロピレン単独重合体 165
エチレン−プロピレンランダム共重合体 145
エチレン−プロピレンブロツク共重合体 163
結果を第１表に示す。
更に、実施例３で得られた球状粒子を第１図
に、比較例１及び２で得られた粒子をそれぞれ第
２図及び第３図に示す。
The present invention relates to a method for producing spherical polypropylene resin particles. BACKGROUND ART Foam molded bodies have conventionally been manufactured using polystyrene or crosslinked polyethylene as a material, for example, by a bead molding method using pre-expanded particles. On the other hand, since polypropylene resin has excellent mechanical strength, heat resistance, chemical resistance, oil resistance, etc., the applicant has conducted research on the development of foam molded products using polypropylene resin, and has developed a method for obtaining pre-expanded particles. We have succeeded in developing a method to obtain a foamed molded product using the pre-expanded particles, and we are already working on a method. However, spherical resin particles can be obtained for polystyrene by a suspension polymerization method and for polyethylene by a crosslinking process, and the pre-expanded particles obtained using these resin particles are spherical, whereas in the case of polypropylene resins. Although pre-expanded particles can be obtained using non-crosslinked resin particles, it is difficult to obtain uniform spherical pre-expanded particles, and the pre-expanded particles cannot be efficiently filled into a mold. However, there is still room for improvement in that it is difficult to obtain a uniform foamed molded product. The purpose of the present invention is to provide a method for producing spherical polypropylene resin particles that eliminates the drawbacks of the prior art, and as a result of intensive research to achieve the above object, the present inventors have A spherical polypropylene resin is obtained by dispersing the particles in a dispersant made of basic magnesium carbonate, talc, aluminum oxide, or a mixture thereof, and then heating the resin particles to a temperature higher than the melting point of the resin particles by 10°C or higher. It was found that it was possible to obtain
The present invention has now been completed. That is, in the present invention, polypropylene resin particles are made into a dispersion medium by using 0.4 parts by weight or more of a dispersant consisting of one or more of basic magnesium carbonate, talc, and aluminum oxide based on 100 parts by weight of the resin particles. Dispersed, the melting point of the above resin particles +10℃
The gist of the present invention is a method for producing spherical polypropylene resin particles, which is characterized by heating to a temperature above. In the present invention, the material of the polypropylene resin particles includes, for example, propylene homopolymer, ethylene-propylene random copolymer, ethylene-propylene random copolymer,
Examples include propylene block copolymers, which can be used alone or in combination, but
Ethylene-propylene random copolymers are particularly preferred. In addition, the polypropylene resin particles can be pelletized by an extruder or crushed by a crusher, etc., and may have any shape, but the weight of the resin particles is 6.
The amount is preferably 5 mg/piece or less, preferably 5 mg/piece or less. In the present invention, the dispersant that can be used is one of basic magnesium carbonate, talc, or aluminum oxide, or a mixture of two or more thereof. This dispersant is used in an amount of 0.4 parts by weight or more per 100 parts by weight of the polypropylene resin particles. If the amount of dispersant added is less than 0.4 parts by weight,
Spheroidization of resin particles, which is the object of the present invention, cannot be expected. Dispersants other than those mentioned above may also be used, such as basic zinc carbonate, calcium phosphate,
Even if calcium carbonate or the like is used, no spheroidizing effect can be expected at all. However, these dispersants may also be added to the extent that they do not impede the effects of the present invention. Examples of the dispersion medium in which the resin particles are dispersed include water, ethylene glycol, glycerin, methanol, ethanol, etc., or a mixture of two or more thereof, but water is usually preferred. The amount of the dispersion medium used is usually 100 parts by weight or more per 100 parts by weight of the resin particles. In the present invention, the resin particles are heated to a temperature above the melting point of the resin particles +10°C, preferably from above the melting point +12°C to below the melting point +50°C. If the heating temperature is lower than the melting point +10° C., it is difficult to make the resin particles spherical, and the object of the present invention cannot be achieved. Also after the heating temperature reaches the desired temperature 15
It is preferable to hold the temperature for more than a minute. In the present invention, the melting point of the resin particles was measured by differential scanning calorimetry (DSC). In this measurement method, the sample is set at 10°C/10°C in a nitrogen atmosphere.
Raise the temperature to 200℃ at a rate of 10℃/min, then increase the temperature to 200℃ at a rate of 10℃/min.
The apex of the melting peak when the temperature was lowered to 50°C and then raised again at a rate of 10°C/min was taken as the melting point, and when there were multiple peaks, the average temperature was taken as the melting point. The spherical polypropylene resin particles obtained by the present invention can be effectively used, for example, in the production of pre-expanded particles of the resin. The method for producing pre-expanded particles includes, for example, placing resin particles, a volatile blowing agent, and a dispersion medium in a closed container, raising the temperature to a predetermined temperature while stirring, and raising the pressure inside the container to a level higher than the vapor pressure of the volatile blowing agent. Alternatively, it may be carried out by opening one end of the container while maintaining the pressure below, and simultaneously releasing the resin particles and dispersion medium from the inside of the container into a low-pressure atmosphere.
The pre-expanded particles thus obtained have less variation in particle shape and also less variation in cellularity (number of cells). Furthermore, when producing pre-expanded particles, a dispersant is usually used and the dispersant adhering to the pre-expanded particles is washed and removed, but if the resin particles obtained by the present invention are used, the pre-expanded particles It is not necessary to wash the resin particles, and the amount of resin particles remaining in the closed container during the production of pre-expanded particles is also very small. In addition, a foamed molded article can be obtained using the pre-expanded particles obtained as described above, and since the shape of the pre-expanded particles is uniform, it can be efficiently filled into a mold for molding, and variations in cell diameter can be avoided. Since the amount is small, a foamed molded article having uniform and excellent physical properties can be obtained. As explained above, according to the present invention, one of basic magnesium carbonate, talc, and aluminum oxide
100 resin particles with a dispersant consisting of a species or two or more species
Spherical resin particles can be obtained by heating the resin particles to a temperature higher than the melting point of the resin particles + 10°C using 0.4 parts by weight or more based on the weight part, and these spherical resin particles can be used, for example, as pre-expanded particles. When used in manufacturing, it is possible to obtain pre-expanded particles with uniform shape, cell diameter, etc., and furthermore, the foam molded product obtained using these pre-expanded particles has excellent physical properties. It is something that you have. Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Examples 1 to 9 and Comparative Examples 1 to 3 The polypropylene resin particles shown in Table 1, a dispersant, and water were placed in the autoclave of 5, and heated to a temperature of 153 to 180°C with stirring and held for 1 hour. The shape of the obtained resin particles was observed. The melting points of the polypropylene resins used in the Examples and Comparative Examples are as follows. Polypropylene resin Melting point (°C) Propylene homopolymer 165 Ethylene-propylene random copolymer 145 Ethylene-propylene block copolymer 163 The results are shown in Table 1. Furthermore, the spherical particles obtained in Example 3 are shown in FIG. 1, and the particles obtained in Comparative Examples 1 and 2 are shown in FIG. 2 and FIG. 3, respectively.
【表】
実施例10および比較例６〜７
５のオートクレープに実施例３で得られた樹
脂粒子または熱処理していない樹脂粒子1000g、
ジクロロジフロロメタン200g、塩基性炭酸マグ
ネシウム15g（実施例10は使用せず）および水
3000gを入れ、容器の一端を開放し、容器内の圧
力を35Kg／cm2、温度を145℃に保持しながら予備
発泡を行なつた。得られた予備発泡粒子の形状、
気泡径、形状のバラツキを測定し、またオートク
レーブ中に残留する樹脂粒子の量を測定した。結
果を第２表に示す。
また得られた予備発泡粒子を成型用金型に充填
し、加熱、発泡させて発泡成型体を得た。成型時
の成型性を調べた。結果を第２表に併せて示す。
尚、実施例10で得られた予備発泡粒子を第４図
に並びに比較例６及び７で得られた予備発泡粒子
をそれぞれ第５図及び第６図に示す。[Table] Example 10 and Comparative Examples 6 to 7 1000 g of the resin particles obtained in Example 3 or non-heat-treated resin particles were placed in the autoclave of 5.
200g dichlorodifluoromethane, 15g basic magnesium carbonate (Example 10 not used) and water
3000 g was added, one end of the container was opened, and preliminary foaming was carried out while maintaining the pressure inside the container at 35 Kg/cm 2 and the temperature at 145°C. The shape of the obtained pre-expanded particles,
Variations in bubble diameter and shape were measured, and the amount of resin particles remaining in the autoclave was also measured. The results are shown in Table 2. Further, the obtained pre-expanded particles were filled into a mold for molding, heated and foamed to obtain a foamed molded article. The moldability during molding was investigated. The results are also shown in Table 2. The pre-expanded particles obtained in Example 10 are shown in FIG. 4, and the pre-expanded particles obtained in Comparative Examples 6 and 7 are shown in FIG. 5 and FIG. 6, respectively.
第１図は本発明により得られた樹脂粒子を示す
斜視図、第２図および第３図は本発明以外の方法
により得られた樹脂粒子を示す斜視図、第４図は
本発明により得られた樹脂粒子を用いて製造され
た予備発泡粒子を示す斜視図、第５図および第６
図は本発明以外の方法により得られた樹脂粒子を
用いて製造された予備発泡粒子を示す斜視図であ
る。
FIG. 1 is a perspective view showing resin particles obtained by the present invention, FIGS. 2 and 3 are perspective views showing resin particles obtained by a method other than the present invention, and FIG. 4 is a perspective view showing resin particles obtained by the present invention. FIGS. 5 and 6 are perspective views showing pre-expanded particles manufactured using resin particles prepared by
The figure is a perspective view showing pre-expanded particles manufactured using resin particles obtained by a method other than the present invention.
Claims (1)
100重量部に対して塩基性炭酸マグネシウム、タ
ルク、酸化アルミニウムの１種または２種以上か
らなる分散剤0.4重量部以上を用いて分散媒に分
散し、上記樹脂粒子の融点＋10℃以上の温度に加
熱することを特徴とする球状ポリプロピレン系樹
脂粒子の製造方法。1 Polypropylene resin particles, the resin particles
Dispersed in a dispersion medium using 0.4 parts by weight or more of a dispersant consisting of one or more of basic magnesium carbonate, talc, and aluminum oxide per 100 parts by weight, and heated to a temperature higher than the melting point of the resin particles + 10 ° C. A method for producing spherical polypropylene resin particles, which comprises heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5176582A JPS58168626A (en) | 1982-03-30 | 1982-03-30 | Production of spherical polypropylene resin particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5176582A JPS58168626A (en) | 1982-03-30 | 1982-03-30 | Production of spherical polypropylene resin particle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58168626A JPS58168626A (en) | 1983-10-05 |
| JPH032890B2 true JPH032890B2 (en) | 1991-01-17 |
Family
ID=12896040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5176582A Granted JPS58168626A (en) | 1982-03-30 | 1982-03-30 | Production of spherical polypropylene resin particle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58168626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1983590A2 (en) | 2007-04-20 | 2008-10-22 | Mitsumi Electric Co., Ltd. | Method of driving a driving device |
| JP2015131907A (en) * | 2014-01-14 | 2015-07-23 | 株式会社ジェイエスピー | Polyolefin based resin particle, polyolefin based resin foamed particle and method for manufacturing polyolefin based resin foamed particle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221440A (en) * | 1984-04-19 | 1985-11-06 | Badische Yuka Co Ltd | Production of foamed particles of propylene resin |
| JPS60245649A (en) * | 1984-05-19 | 1985-12-05 | Japan Styrene Paper Co Ltd | Preparation of foamed particle of crosslinked polyolefin resin |
-
1982
- 1982-03-30 JP JP5176582A patent/JPS58168626A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1983590A2 (en) | 2007-04-20 | 2008-10-22 | Mitsumi Electric Co., Ltd. | Method of driving a driving device |
| JP2015131907A (en) * | 2014-01-14 | 2015-07-23 | 株式会社ジェイエスピー | Polyolefin based resin particle, polyolefin based resin foamed particle and method for manufacturing polyolefin based resin foamed particle |
| WO2015108040A1 (en) * | 2014-01-14 | 2015-07-23 | 株式会社ジェイエスピー | Polyolefin resin particles, polyolefin resin foamed particles, and method for producing polyolefin resin foamed particles |
| US9650486B2 (en) | 2014-01-14 | 2017-05-16 | Jsp Corporation | Polyolefin resin particles, polyolefin resin foamed particles, and method for producing polyolefin resin foamed particles |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58168626A (en) | 1983-10-05 |
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