JPS625455B2 - - Google Patents
Info
- Publication number
- JPS625455B2 JPS625455B2 JP56175989A JP17598981A JPS625455B2 JP S625455 B2 JPS625455 B2 JP S625455B2 JP 56175989 A JP56175989 A JP 56175989A JP 17598981 A JP17598981 A JP 17598981A JP S625455 B2 JPS625455 B2 JP S625455B2
- Authority
- JP
- Japan
- Prior art keywords
- particles
- polymer particles
- blowing agent
- present
- expanded
- 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
Links
- 239000002245 particle Substances 0.000 claims description 63
- 229920000642 polymer Polymers 0.000 claims description 29
- 239000004604 Blowing Agent Substances 0.000 claims description 22
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000002612 dispersion medium Substances 0.000 claims description 11
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 claims description 9
- 229940029284 trichlorofluoromethane Drugs 0.000 claims description 9
- 239000004338 Dichlorodifluoromethane Substances 0.000 claims description 8
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 claims description 8
- 235000019404 dichlorodifluoromethane Nutrition 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000005187 foaming Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910001872 inorganic gas Inorganic materials 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
- 239000000463 material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 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
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000005070 ripening Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material 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
- 229920005630 polypropylene random copolymer Polymers 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
本発明はエチレン−プロピレン共重合体予備発
泡粒子の製造方法に関する。
本出願人は重合体粒子の予備発泡方法について
すでに提案している（特公昭56−1344号）。この
方法では、揮発性発泡剤を含有する重合体粒子を
密閉容器内で水に分散させ容器内の圧力を該発泡
剤の蒸気圧或いはそれ以上の圧力に保持しながら
該重合体の軟化温度以上に加熱した後、容器内の
水面下の１端を開放し、重合体粒子と水とを同時
に容器内よりも低圧の雰囲気に放出することによ
り予備発泡が行なわれている。この方法により得
られた予備発泡粒子は高発泡の画期的なものであ
るが、気泡径が小さい（気泡数が多い）ことによ
る成型時の収縮、得られる発泡成形体の柔軟性等
に末だ起良の余地を残しているものである。
本発明は、上記従来技術の予備発泡粒子をさら
に改良したエチレン−プロピレン共重合体予備発
泡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、本発明者らは優れた性質を有する予
備発泡粒子を得るべく鋭意研究した結果、ジクロ
ロジフロロメタンとトリクロロフロロメタンとよ
りなる揮発性発泡剤を用いることにより平均気泡
径（以下気泡径と言う）が大きい（平均気泡数
（以下気泡数と言う）が少ない）優れた性質を有
するエチレン−プロピレン共重合体予備発泡粒子
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、ジクロロジフロロメタン
のトリクロロフロロメタンに対するモル比が1.40
〜0.25であるジクロロジフロロメタンとトリクロ
ロフロロメタンとを含有する揮発性発泡剤をエチ
レン−プロピレン共重合体粒子に含有させる工
程、前記重合体粒子を分散媒に分散させ加熱する
工程、前記重合体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工程よりなることを
特徴とするエチレン−プロピレン共重合体予備発
泡粒子の製造方法を要旨とするものである。
本発明に用いられるエチレン−プロピレン共重
合体としては、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、架橋しもの或いは無架橋のものい
ずれでもよいが無架橋のものが有益である。この
共重合体はポリプロピレン系ランダム共重合体が
好ましく、エチレン成分10重量％以下、好ましく
は５重量％以下のものが特に好ましい。尚、プロ
ピレン単独重合体の場合には気泡径が大きい予備
発泡粒子は得られないため用いることはできな
い。
本発明に用いられる揮発性発泡剤はジクロロジ
フロロメタンとトリクロロフロロメタンとを含有
し、ジクロロジフロロメタンのトリクロロフロロ
メタンに対するモル比が1.40〜0.25である。モル
比が1.40を超えると気泡径は大きくならず、成型
時の収縮が大きく発泡成型体の柔軟性は小さく本
発明の目的を達成することができない。またモル
比が0.25未満ではトリクロロフロロメタンによる
予備発泡粒子の可塑化が大き過ぎ粒子が予備発泡
時に融着し、良好な発泡成形体は得られない。こ
の発泡剤の添加量は所望する発泡の程度によつて
異なるが共重合体粒子100重量部に対し通常10〜
40重量部である。尚、本発明において揮発性発泡
剤は基本的にジクロロジフロロメタンとトリクロ
ロフロロメタンとよりなるが、本発明の効果を損
なわない範囲で他の発泡剤を添加してもよい。
本発明において、発泡剤を重合体粒子に含有さ
せる時期は特に限定されない、従つて予め重合体
粒子に発泡剤を含有させておき、この発泡剤を含
有した重合体粒子を密閉容器内に入れて該密閉容
器内で分散媒に分散させてもよく、或いは重合体
粒子と発泡剤を密閉容器内に入れて該密閉容器内
でそれらを分散媒に分散させつつ重合体粒子に発
泡剤を含有させてもよい（後者の場合でも発泡剤
を含有した重合体粒子が分散媒に分散されること
はいうまでもない）。または密閉容器内で前記粒
子をそれが軟化する温度以上の温度に加熱する過
程において或いは加熱した後において発泡剤を前
記密閉容器内に入れて前記粒子と発泡剤を分散さ
せつつ前記粒子に発泡剤を含有させてもよい。
尚、前記粒子に発泡剤を含有させる時の温度も
任意であり特に限定されない。
本発明において重合体粒子と発泡剤を別々に或
いは発泡剤を重合体粒子に含有させた後分散媒に
分散させるが、このとき要すれば分散剤例えば微
粒状の酸化アルミニウムおよび酸化チタン、塩基
性炭酸マグネシウム、塩基性炭酸亜鉛、炭酸カル
シウム等を用いることができる。この分散剤の添
加量は重合体粒子100重量部に対し通常0.01〜10
重量部である。本発明において用いられる分散媒
は重合体粒子を溶解させない溶媒であればよく、
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種又はそれら
の２種以上の混合物が例示されるが通常は水が好
ましい。
本発明において、密閉容器中で重合体粒子分散
後、重合体粒子を該粒子が軟化する温度以上の温
度に加熱するが、この加熱温度は気泡が破壊され
ず、好適に発泡される範囲内において適宜選択さ
れ、重合体粒子の種類によつて異なるが通常90〜
170℃である。
本発明において、重合体粒子加熱後、容器の一
端を開放して重合体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が、このときの容
器内の温度は特に制限はないが通常は重合体粒子
の熱変形温度以上であり、また圧力は発泡剤の蒸
気圧以上または以下のいずれでもよく、特に制限
はない。重合体粒子と水とを放出する雰囲気は通
常常圧の雰囲気が選ばれる。
上記のようにして得られる本発明の予備発泡粒
子は通常３〜60倍の見掛け発泡倍率、100個／mm2
以下の気泡数（気泡径が大きい）を有する。
上記の予備発泡粒子は次いで常温常圧下にて所
定時間熟成した後、必要に応じて無機ガスまたは
無機ガスと揮発性発泡剤との混合ガスにより所定
温度、所定圧力にて加圧熟成され、粒子内に内圧
が付与される。無機ガスとしては空気、窒素、ア
ルゴン、ヘリウム等が挙げられるが通常は空気が
用いられる。
内圧を付与された予備発泡粒子を次いで金型に
充填し、２〜５Kg／cm2(G)の水蒸気を用いて加熱膨
張させることにより型通りの発泡成型体を得るこ
とができる。
得られる発泡成型体は例えば包装材、緩衝材、
建築資材、車輌部材、断熱材、浮揚材、食品容器
等に用いることができる。
以上説明したように、本発明により得られる予
備発泡粒子は気泡径が大きい（気泡数が少ない）
ので、これを用いて得られる発泡成型体は収縮が
なく柔軟性が大きい（腰が強い）良好な性質を有
するものである。また、予備発泡粒子は成型に先
立つて通常加圧熟成されるが、本発明の予備発泡
粒子は無機ガスを粒子内に導入し易く加圧熟成工
程を短縮できる利点を有するものである。
以下、実施例および比較例を揚げて本発明をさ
らに詳細に説明する。
実施例１〜４および比較例１〜３
第１表に示す配合および量で重合体粒子、水、
揮発性発泡剤および微粒状酸化アルミニウムを密
閉容器内に入れ、撹拌下135〜160℃まで昇温した
後、容器内を第１表に示す温度および圧力に保持
しながら容器の一端を開放して重合体粒子と水と
を同時に大気下へ放出して予備発泡を行ない第１
表に示す発泡倍率および気泡数を有する予備発泡
粒子を得た。得られた予備発泡粒子は融着がな
く、気泡径が大きい（気泡数が少ない）優れた性
質を有するものであつた。尚、予備発泡時の融着
状態を第１表に併せて示す。
尚、気泡数の測定は切断面を顕微鏡にて観察す
ることにより行なつた。
The present invention relates to a method for producing pre-expanded ethylene-propylene copolymer particles. The present applicant has already proposed a method for pre-foaming polymer particles (Japanese Patent Publication No. 1344/1983). In this method, polymer particles containing a volatile blowing agent are dispersed in water in a closed container, and while the pressure inside the container is maintained at the vapor pressure of the blowing agent or higher, the temperature is increased to a temperature higher than the softening temperature of the polymer. Pre-foaming is performed by opening one end of the container below the water surface and simultaneously releasing the polymer particles and water into an atmosphere at a lower pressure than the inside of the container. Although the pre-expanded particles obtained by this method are highly foamable, they suffer from shrinkage during molding due to the small cell diameter (large number of cells) and flexibility of the resulting foamed product. This leaves room for improvement. An object of the present invention is to provide a method for producing ethylene-propylene copolymer pre-expanded particles which are further improved over the pre-expanded particles of the prior art, and which the present inventors have discovered have excellent properties. As a result of intensive research to obtain pre-expanded particles, we found that by using a volatile blowing agent consisting of dichlorodifluoromethane and trichlorofluoromethane, the average cell diameter (hereinafter referred to as cell diameter) is large (average cell number (hereinafter referred to as cell number)). The present inventors have discovered that pre-expanded ethylene-propylene copolymer particles can be obtained that have excellent properties (with a small amount of ethylene-propylene copolymer particles), and have completed the present invention. That is, in the present invention, the molar ratio of dichlorodifluoromethane to trichlorofluoromethane is 1.40.
A step of incorporating a volatile blowing agent containing dichlorodifluoromethane and trichlorofluoromethane of ~0.25 into ethylene-propylene copolymer particles, a step of dispersing the polymer particles in a dispersion medium and heating the polymer particles, and a step of dispersing the polymer particles in a dispersion medium and heating the polymer particles. The gist of the present invention is a method for producing pre-expanded ethylene-propylene copolymer particles, which comprises a step of simultaneously releasing particles and a dispersion medium from a container into a low-pressure atmosphere. Examples of the ethylene-propylene copolymer used in the present invention include ethylene-propylene random copolymers, ethylene-propylene block copolymers, etc., and they may be crosslinked or non-crosslinked, but non-crosslinked copolymers may be used. is beneficial. This copolymer is preferably a polypropylene random copolymer, and an ethylene component of 10% by weight or less, preferably 5% by weight or less is particularly preferred. Note that propylene homopolymer cannot be used because pre-expanded particles with large cell diameters cannot be obtained. The volatile blowing agent used in the present invention contains dichlorodifluoromethane and trichlorofluoromethane, and the molar ratio of dichlorodifluoromethane to trichlorofluoromethane is 1.40 to 0.25. If the molar ratio exceeds 1.40, the cell diameter will not be large, and the shrinkage during molding will be large and the flexibility of the foam molded product will be low, making it impossible to achieve the object of the present invention. If the molar ratio is less than 0.25, the plasticization of the pre-expanded particles by trichlorofluoromethane will be too large and the particles will fuse during pre-expanding, making it impossible to obtain a good foamed molded product. The amount of this foaming agent added varies depending on the desired degree of foaming, but is usually 10 to 10 parts by weight per 100 parts by weight of the copolymer particles.
It is 40 parts by weight. In the present invention, the volatile blowing agent basically consists of dichlorodifluoromethane and trichlorofluoromethane, but other blowing agents may be added as long as the effects of the present invention are not impaired. In the present invention, there is no particular limitation on when the blowing agent is added to the polymer particles. Therefore, the blowing agent is added to the polymer particles in advance, and the polymer particles containing the blowing agent are placed in a closed container. The polymer particles may be dispersed in a dispersion medium in the closed container, or the polymer particles and the blowing agent may be placed in a closed container and the blowing agent may be contained in the polymer particles while being dispersed in the dispersion medium in the closed container. (It goes without saying that even in the latter case, the polymer particles containing the blowing agent are dispersed in the dispersion medium). Alternatively, during the process of heating the particles to a temperature higher than the temperature at which they soften in a closed container, or after heating, a blowing agent is introduced into the closed container to disperse the particles and the blowing agent, and the blowing agent is applied to the particles. may be included. Note that the temperature at which the foaming agent is incorporated into the particles is also arbitrary and not particularly limited. In the present invention, the polymer particles and the blowing agent are dispersed in a dispersion medium either separately or after the blowing agent is contained in the polymer particles. Magnesium carbonate, basic zinc carbonate, calcium carbonate, etc. can be used. The amount of this dispersant added is usually 0.01 to 10 parts by weight per 100 parts by weight of the polymer particles.
Parts by weight. The dispersion medium used in the present invention may be any solvent that does not dissolve the polymer particles,
Examples include water, ethylene glycol, glycerin, methanol, ethanol, etc., or a mixture of two or more thereof, but water is usually preferred. In the present invention, after dispersing the polymer particles in a closed container, the polymer particles are heated to a temperature higher than the temperature at which the particles soften, but the heating temperature is within a range that does not destroy bubbles and allows suitable foaming. Appropriately selected, depending on the type of polymer particles, but usually 90~
The temperature is 170℃. In the present invention, after heating the polymer particles, one end of the container is opened and the polymer particles and dispersion medium are simultaneously released into a lower pressure atmosphere from inside the container, although there is no particular restriction on the temperature inside the container at this time. The pressure is usually higher than the heat deformation temperature of the polymer particles, and the pressure may be higher than or lower than the vapor pressure of the blowing agent, and is not particularly limited. The atmosphere in which the polymer particles and water are released is usually an atmosphere at normal pressure. The pre-expanded particles of the present invention obtained as described above usually have an apparent expansion ratio of 3 to 60 times and 100 particles/mm 2
It has the following number of bubbles (large bubble diameter): The above-mentioned pre-expanded particles are then aged at room temperature and normal pressure for a predetermined period of time, and then pressure-ripened at a predetermined temperature and pressure using an inorganic gas or a mixed gas of an inorganic gas and a volatile blowing agent as needed. Internal pressure is applied inside. Examples of the inorganic gas include air, nitrogen, argon, helium, etc., but air is usually used. The pre-expanded particles to which internal pressure has been applied are then filled into a mold and heated and expanded using 2 to 5 kg/cm 2 (G) of water vapor to obtain a foam molded article according to the mold. The resulting foam molded product can be used, for example, as a packaging material, a cushioning material,
It can be used for construction materials, vehicle parts, insulation materials, flotation materials, food containers, etc. As explained above, the pre-expanded particles obtained by the present invention have a large cell diameter (a small number of cells).
Therefore, the foamed molded product obtained using this material has good properties such as no shrinkage and high flexibility (strong stiffness). Further, pre-expanded particles are usually subjected to pressure ripening prior to molding, but the pre-expanded particles of the present invention have the advantage that inorganic gas can be easily introduced into the particles, thereby shortening the pressure ripening process. Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Examples 1 to 4 and Comparative Examples 1 to 3 Polymer particles, water,
A volatile blowing agent and finely divided aluminum oxide are placed in a closed container, and the temperature is raised to 135 to 160°C under stirring. One end of the container is opened while maintaining the temperature and pressure in the container as shown in Table 1. The polymer particles and water are released into the atmosphere at the same time to perform preliminary foaming.
Pre-expanded particles having the expansion ratio and number of cells shown in the table were obtained. The obtained pre-expanded particles had excellent properties such as no fusion and large cell diameter (small number of cells). The fused state during preliminary foaming is also shown in Table 1. Note that the number of bubbles was measured by observing the cut surface with a microscope.
【表】【table】
【表】
得られた予備発泡粒子を常温、常圧下50時間熟
成した後、20℃、４Kg／cm2(G)の空気により100時
間加圧熟成を行なつた。この後予備発泡粒子を金
型に充填し、各々、2.5Kg／cm2(G)（ランダム共重
合体）、5.3Kg／cm2(G)（ブロツク共重合体）、６
Kg／cm2(G)（単独重合体）の水蒸気圧により加熱膨
張させて第１表に示す発泡倍率を有する発泡成型
体を得た。得られた発泡成型体の外観を観察し、
また収縮率および柔軟性を測定した。結果を第２
表に示す。[Table] The obtained pre-expanded particles were aged at room temperature and pressure for 50 hours, and then pressure aged at 20°C in air at 4 kg/cm 2 (G) for 100 hours. After this, the pre-expanded particles were filled into a mold, and the particles were respectively 2.5Kg/cm 2 (G) (random copolymer), 5.3Kg/cm 2 (G) (block copolymer), and 6
Kg/cm 2 (G) (homopolymer) was heated and expanded under water vapor pressure to obtain a foamed molded product having the expansion ratio shown in Table 1. Observing the appearance of the obtained foam molding,
The shrinkage rate and flexibility were also measured. Second result
Shown in the table.
【表】【table】
Claims (1)
メタンに対するモル比が1.40〜0.25であるジクロ
ロジフロロメタンとトリクロロフロロメタンとを
含有する揮発性発泡剤をエチレン−プロピレン共
重合体粒子に含有させる工程、前記重合体粒子を
分散媒に分散させ加熱する工程および容器の一端
を開放し、前記重合体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工程よりなるこ
とを特徴とするエチレン−プロピレン共重合体予
備発泡粒子の製造方法。1. A step of incorporating into ethylene-propylene copolymer particles a volatile blowing agent containing dichlorodifluoromethane and trichlorofluoromethane in which the molar ratio of dichlorodifluoromethane to trichlorofluoromethane is 1.40 to 0.25; An ethylene-propylene copolymer comprising the steps of dispersing the particles in a dispersion medium and heating them, and opening one end of the container and simultaneously releasing the polymer particles and the dispersion medium from inside the container into a low-pressure atmosphere. Method for producing coalesced pre-expanded particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56175989A JPS5876233A (en) | 1981-11-02 | 1981-11-02 | Manufacture of ethylene/propylene copolymer prefoamed particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56175989A JPS5876233A (en) | 1981-11-02 | 1981-11-02 | Manufacture of ethylene/propylene copolymer prefoamed particle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5876233A JPS5876233A (en) | 1983-05-09 |
| JPS625455B2 true JPS625455B2 (en) | 1987-02-05 |
Family
ID=16005749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56175989A Granted JPS5876233A (en) | 1981-11-02 | 1981-11-02 | Manufacture of ethylene/propylene copolymer prefoamed particle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5876233A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0686544B2 (en) * | 1985-07-12 | 1994-11-02 | 鐘淵化学工業株式会社 | Non-crosslinked linear low density polyethylene pre-expanded particles and molding method thereof |
| JPS62115042A (en) * | 1985-11-14 | 1987-05-26 | Kanegafuchi Chem Ind Co Ltd | Pre-expanded polyolefin resin particle and production thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2107683A1 (en) * | 1971-02-18 | 1972-08-31 | Basf Ag | Particulate foamed polyolefin prodn - by expansion with opt halogenated hydrocarbons in presence of water |
| JPS561344A (en) * | 1979-06-18 | 1981-01-09 | Nishimu Denshi Kogyo Kk | Controlling method for optimum wet-quantity in wet-type insulator stain measurement |
-
1981
- 1981-11-02 JP JP56175989A patent/JPS5876233A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2107683A1 (en) * | 1971-02-18 | 1972-08-31 | Basf Ag | Particulate foamed polyolefin prodn - by expansion with opt halogenated hydrocarbons in presence of water |
| JPS561344A (en) * | 1979-06-18 | 1981-01-09 | Nishimu Denshi Kogyo Kk | Controlling method for optimum wet-quantity in wet-type insulator stain measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5876233A (en) | 1983-05-09 |
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