JP4974538B2 - EPDM foam and method for producing the same - Google Patents
EPDM foam and method for producing the same Download PDFInfo
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本発明は、白色系又はカラーＥＰＤＭ発泡体及びその製造方法に関するものである。 The present invention relates to a white or color EPDM foam and a method for producing the same.
従来から知られたゴム発泡体製品は、その使用目的に応じていくつかのゴム原料を混ぜ合わせ、これに配合剤を加え、加硫工程を経て製造されている。その中のエチレンプロピレンジエン共重合体ゴム（ＥＰＤＭ）は、耐熱性、耐トラッキング性や反発弾性がよい為その用途は極めて広く、一般ゴム製品、工業用ゴム製品、自動車用ゴム製品、建築用ゴム製品等に使用されている。例えば、ＥＰＤＭ発泡性組成物を金型内で加熱して1次加熱段階の予備処理を施した後、大型の金型枠内で加熱して２次加熱段階により製造する方法（特許第３１８１５４９号公報）が提案されている。 Conventionally known rubber foam products are manufactured through a vulcanization process by mixing several rubber raw materials according to the purpose of use and adding a compounding agent thereto. Among them, ethylene propylene diene copolymer rubber (EPDM) has excellent heat resistance, tracking resistance and rebound resilience, so its use is very wide. General rubber products, industrial rubber products, automotive rubber products, building rubber Used in products. For example, the EPDM foamable composition is heated in a mold and pretreated in the primary heating stage, and then heated in a large mold frame and manufactured in the secondary heating stage (Japanese Patent No. 3181549). Publication).
しかし、従来のＥＰＤＭ発泡体は補強剤にカーボンブラックを使用している為、発泡体の色を黒以外にすることができなかった。 However, since the conventional EPDM foam uses carbon black as a reinforcing agent, the color of the foam could not be other than black.
従来、白色のＥＰＤＭゴム組成物を得る方法としては、酸化けい素、炭酸カルシウム、タルク、クレイなどの白色フィラーを配合したり（特開平１１−３１０６７３号公報）、シリカおよび活性化炭酸カルシウムを配合する方法（特開２０００−３０２２６８号公報）が知られている。
しかしながら、上記特許はＥＰＤＭの固形物の特許であり、白色フィラーを既存のＥＰＤＭ発泡体に単純に配合するだけでは、発泡時にガス抜けや割れが生じ、正常な発泡体が得られなかった。 However, the above-mentioned patent is a patent for EPDM solids, and simply adding a white filler to an existing EPDM foam resulted in outgassing and cracking during foaming, and a normal foam could not be obtained.
本発明者らは、高エチレンタイプのＥＰＤＭ樹脂と、高ムーニー粘度のＥＰＤＭ樹脂をブレンドし、さらに表面処理をした炭酸カルシウムを添加することにより、発泡時にガス抜けや割れが生じない、白色系又はカラーＥＰＤＭ発泡体およびその製造方法を開発した。 The present inventors blended a high ethylene type EPDM resin and a high Mooney viscosity EPDM resin, and further added surface-treated calcium carbonate to prevent outgassing and cracking during foaming. A color EPDM foam and its manufacturing method have been developed.
本発明に係るＥＰＤＭ発泡体は、高エチレンタイプのＥＰＤＭ樹脂と、高ムーニー粘度のＥＰＤＭ樹脂に表面処理をした炭酸カルシウムを添加し、軟化剤、充填剤、加硫促進剤、発泡剤及び加硫剤を添加混練して加熱、発泡して得られるものである。 The EPDM foam according to the present invention comprises a high ethylene type EPDM resin and a calcium carbonate surface-treated with a high Mooney viscosity EPDM resin, a softener, a filler, a vulcanization accelerator, a foaming agent, and a vulcanization It is obtained by adding and kneading the agent, heating and foaming.
上記発泡体において、高エチレンタイプのＥＰＤＭ樹脂のエチレン含有量は、６０〜７５重量％であることが好ましい。この条件を満たすと、発泡時のガス抜けや割れがなくなる。エチレン含有量が、６０重量％未満の場合は、ガス抜けが生じやすい。エチレン含有量が、７５重量％を超える場合は、割れが発生しやすい。
In the foam, the ethylene content of the high ethylene type EPDM resin is preferably 60 to 75 % by weight. When this condition is satisfied, gas escape and cracking during foaming are eliminated. When the ethylene content is less than 60 % by weight, outgassing tends to occur. If the ethylene content exceeds 75% by weight, cracks are likely to occur.
上記発泡体において、高ムーニー粘度タイプのＥＰＤＭ樹脂のムーニー粘度は、５５〜６５ＭＬ（１＋４）１００℃であることが好ましい。この条件を満たすと、発泡時のガス抜けや割れがなくなる。ムーニー粘度が５５ML（１＋４）１００℃未満の場合はガス抜けが生じやすい。ムーニー粘度が６５ML（１＋４）１００℃を超える場合は割れが発生しやすい。 In the foam, the Mooney viscosity of the high Mooney viscosity type EPDM resin is preferably 55 to 65 ML (1 + 4) 100 ° C. When this condition is satisfied, gas escape and cracking during foaming are eliminated. When the Mooney viscosity is less than 55 ML (1 + 4) 100 ° C., outgassing tends to occur. When the Mooney viscosity exceeds 65 ML (1 + 4) 100 ° C., cracking is likely to occur.
本発明に係るＥＰＤＭ発泡体の製造方法は、高エチレンタイプのＥＰＤＭ樹脂７０〜９０重量部と、高ムーニー粘度のＥＰＤＭ樹脂３０〜１０重量部からなるゴム組成物に補強剤として表面処理をした炭酸カルシウム１０〜３０重量部を添加し、軟化剤、充填剤、加硫促進剤、発泡剤及び加硫剤を添加混練して加熱、発泡させるものである。 The method for producing an EPDM foam according to the present invention comprises a carbon composition obtained by subjecting a rubber composition comprising 70 to 90 parts by weight of a high ethylene type EPDM resin and 30 to 10 parts by weight of a high Mooney viscosity EPDM resin to a surface treatment as a reinforcing agent. 10 to 30 parts by weight of calcium is added, and a softener, a filler, a vulcanization accelerator, a foaming agent and a vulcanizing agent are added and kneaded, and heated and foamed.
上記本発明の製造方法において、高エチレンタイプのＥＰＤＭ樹脂のエチレン含有量は、６０〜７５重量％であることが好ましい。この条件を満たすと、発泡時のガス抜けや割れがなくなる。エチレン含有量が、６０重量％未満の場合は、ガス抜けが生じやすい。エチレン含有量が、７５重量％を超える場合は、割れが発生しやすい。 In the production method of the present invention, the ethylene content of the high ethylene type EPDM resin is preferably 60 to 75% by weight. When this condition is satisfied, gas escape and cracking during foaming are eliminated. When the ethylene content is less than 60% by weight, outgassing tends to occur. If the ethylene content exceeds 75% by weight, cracks are likely to occur.
上記本発明の製造方法において、高ムーニー粘度タイプのＥＰＤＭ樹脂のムーニー粘度は、５５〜６５ＭＬ（１＋４）１００℃であることが好ましい。この条件を満たすと、発泡時のガス抜けや割れがなくなる。ムーニー粘度が５５ML（１＋４）１００℃未満の場合はガス抜けが生じやすい。ムーニー粘度が６５ML（１＋４）１００℃を超える場合は割れが発生しやすい。 In the production method of the present invention, the Mooney viscosity of the high Mooney viscosity type EPDM resin is preferably 55 to 65 ML (1 + 4) 100 ° C. When this condition is satisfied, gas escape and cracking during foaming are eliminated. When the Mooney viscosity is less than 55 ML (1 + 4) 100 ° C., outgassing tends to occur. When the Mooney viscosity exceeds 65 ML (1 + 4) 100 ° C., cracking is likely to occur.
本発明の方法によれば、発泡体の色が黒色以外の、白色系ＥＰＤＭ発泡体が得られ、黄色や赤色等の顔料を添加すれば、黄色や赤色等のカラーＥＰＤＭ発泡体を得ることが出来る。 According to the method of the present invention, a white EPDM foam having a foam color other than black can be obtained. When a pigment such as yellow or red is added, a color EPDM foam such as yellow or red can be obtained. I can do it.
本発明でいうＥＰＤＭ樹脂とは、エチレンプロピレンジエン共重合体ゴムであり、エチレン含有量６０〜７５重量％およびムーニー粘度５５〜６５ＭＬ（１＋４）１００℃のものが好ましい。 The EPDM resin referred to in the present invention is an ethylene propylene diene copolymer rubber, preferably having an ethylene content of 60 to 75% by weight and a Mooney viscosity of 55 to 65 ML (1 + 4) 100 ° C.
本発明でいう補強剤には、表面処理をした炭酸カルシウムが用いられ、その表面処理剤には脂肪酸等がある。また、その粒子径は１００ｎｍ以下であることが好ましい。１００ｎｍを越える粒子径を添加すると、発泡体のホールの原因になる。その添加量はＥＰＤＭ樹脂１００重量部に対して１０〜３０重量部添加することが好ましい。炭酸カルシウムの添加量が上記範囲未満である場合、補強効果に劣り、上記範囲を越えて添加する場合、発泡成形を阻害し、満足な発泡体が得られない。 As the reinforcing agent in the present invention, surface-treated calcium carbonate is used, and examples of the surface treating agent include fatty acids. Moreover, it is preferable that the particle diameter is 100 nm or less. Addition of a particle size exceeding 100 nm causes holes in the foam. The addition amount is preferably 10 to 30 parts by weight with respect to 100 parts by weight of EPDM resin. When the addition amount of calcium carbonate is less than the above range, the reinforcing effect is inferior. When the addition amount exceeds the above range, foam molding is inhibited, and a satisfactory foam cannot be obtained.
本発明でいう軟化剤とは、プロセスオイル、可塑剤、パラフィンワックス、流動性パラフィン等のゴムとの相溶性が良いものであり、ゴム成分１００重量部に対して、１０〜２００重量部、好ましくは３０〜１００重量部含むことが望ましい。軟化剤の添加量が上記範囲未満である場合、発泡体の柔軟性が乏しくなり、上記範囲を越えて添加する場合、発泡成形を阻害し、満足な発泡体が得られない。 The softener as used in the present invention has good compatibility with rubber such as process oil, plasticizer, paraffin wax, fluid paraffin and the like, and preferably 10 to 200 parts by weight, preferably 100 parts by weight of rubber component. It is desirable to contain 30 to 100 parts by weight. When the addition amount of the softening agent is less than the above range, the flexibility of the foam becomes poor. When the addition amount exceeds the above range, the foam molding is inhibited and a satisfactory foam cannot be obtained.
本発明でいう充填剤とは、クレー、タルク、酸化チタン、水酸化アルミニウム、水酸化マグネシウム、シリカ等である。 The filler referred to in the present invention includes clay, talc, titanium oxide, aluminum hydroxide, magnesium hydroxide, silica and the like.
本発明でいう加硫促進剤とは、チアゾール系の２−メルカプトベンゾチアゾール等；グアニジン系のジフェニルグアニジン等；チウラム系のテトラメチルチウラムジスルフィドまたはジペンタメチレンチウラムテトラスルフィド等；ジチオカルバメート系のジブチルジチオカルバミン酸亜鉛等のゴムに常用されるものである。 The vulcanization accelerator used in the present invention includes thiazole-based 2-mercaptobenzothiazole, etc .; guanidine-based diphenylguanidine, etc .; thiuram-based tetramethylthiuram disulfide or dipentamethylenethiuram tetrasulfide, etc .; dithiocarbamate-based dibutyldithiocarbamine It is commonly used for rubber such as zinc acid.
本発明でいう発泡剤とは、アゾ系化合物のアゾジカルボンアミド、バリウムアゾジカルボキシレート等；ニトロソ系化合物のジニトロソペンタメチレンテトラミン、トリニトロトリメチルトリアミン等；ヒドラジッド系化合物のｐ，ｐ‘−オキシビスベンゼンスルホニルヒドラジッド等；スルホニルセミカルバジッド系化合物のｐ，ｐ‘−オキシビスベンゼンスルホニルセミカルバジッド、トルエンスルホニルセミカルバジッド等である。 The foaming agent used in the present invention refers to azo compounds such as azodicarbonamide and barium azodicarboxylate; nitroso compounds such as dinitrosopentamethylenetetramine and trinitrotrimethyltriamine; and hydrazide compounds such as p, p′-oxy. Bisbenzenesulfonyl hydrazide and the like; p, p'-oxybisbenzenesulfonyl semicarbazide, toluenesulfonyl semicarbazide and the like of sulfonyl semicarbazide compounds.
本発明でいう加硫剤とは、硫黄粉、硫黄化合物のアルキルフェノールジスルフィド等；有機過酸化物のジクミルパーオキサイド等である。 The vulcanizing agent referred to in the present invention includes sulfur powder, sulfur compound alkylphenol disulfide and the like; organic peroxide dicumyl peroxide and the like.
本発明において、発泡助剤を発泡剤の種類に応じて添加することができる。発泡助剤としては尿素を主成分とした化合物、酸化亜鉛、酸化鉛等の金属酸化物、サリチル酸、ステアリン酸等を主成分とする化合物、即ち高級脂肪酸あるいは高級脂肪酸の金属化合物などがある。 In the present invention, a foaming aid can be added depending on the type of foaming agent. Examples of the foaming aid include compounds mainly composed of urea, metal oxides such as zinc oxide and lead oxide, compounds mainly composed of salicylic acid and stearic acid, that is, higher fatty acids or higher fatty acid metal compounds.
本発明のＥＰＤＭ発泡体の製造方法は、用いた発泡剤や加硫剤などによる発泡温度や加硫開始温度などにより、従来公知の方法及び適宜の条件で行うことができる。特に好ましい方法及び条件を下記に記述する。 The production method of the EPDM foam of the present invention can be carried out by a conventionally known method and appropriate conditions depending on the foaming temperature, the vulcanization start temperature, and the like by the used foaming agent or vulcanizing agent. Particularly preferred methods and conditions are described below.
高エチレンタイプのＥＰＤＭ樹脂７５重量部と、高ムーニー粘度のＥＰＤＭ樹脂２５重量部からなるゴム組成物に表面処理をした炭酸カルシウム１５重量部を添加し、周知の軟化剤、充填剤、加硫促進剤、発泡剤、発泡助剤及び加硫剤を添加し、これをミキシングロール、加圧式ニーダー、押出機等によって練和する。次いで、得られた発泡性樹脂組成物をプレス中の金型に充填し、一定時間加圧下に９０〜１１５℃で加熱し、未加硫ゴムをスコーチ状態にし、かつ、発泡剤を部分的に分解し、好ましくは、発泡倍率１．０〜１．２の中間発泡体を生成させる。次いで、該中間発泡体を常圧下にて密閉系でない直方体型などの所望の形状の型内に入れ、１２０〜１４０℃で加熱し、発泡剤及び加硫剤を完全に分解させて発泡体を得る。 15 parts by weight of surface-treated calcium carbonate is added to a rubber composition consisting of 75 parts by weight of high ethylene type EPDM resin and 25 parts by weight of EPDM resin with high Mooney viscosity, and well-known softeners, fillers and vulcanization accelerators are added. An agent, a foaming agent, a foaming aid and a vulcanizing agent are added and kneaded with a mixing roll, a pressure kneader, an extruder or the like. Next, the obtained foamable resin composition is filled in a mold during pressing, heated at 90 to 115 ° C. under pressure for a certain period of time, the unvulcanized rubber is brought into a scorch state, and the foaming agent is partially added. It decomposes, and preferably produces an intermediate foam having a foaming ratio of 1.0 to 1.2. Next, the intermediate foam is put into a mold having a desired shape such as a rectangular parallelepiped mold that is not a closed system under normal pressure, and heated at 120 to 140 ° C. to completely decompose the foaming agent and the vulcanizing agent to obtain the foam. obtain.
以上のようにして得られた気泡体（いわゆる独立気泡体）は、次いで例えば等速二本ロール等により圧縮変形を加えることによって気泡膜は破壊され、気泡が連通化されて連続気泡体が得られる。等速二本ロールの表面に無数の小さい針を設けるか、又は等速二本ロールの前及び／又は後に無数の小さい針を設けたロールを配置して、該気泡体の表面に無数の小孔を開けることによって、気泡の連通化を促進させることができる。 The foam obtained as described above (so-called closed-cell foam) is then subjected to compressive deformation by, for example, a constant-velocity two-roll or the like, so that the foam film is broken and the bubbles are connected to obtain an open-cell foam. It is done. An infinite number of small needles are provided on the surface of the constant-velocity two-roll, or a roll provided with innumerable small needles is arranged before and / or after the constant-speed two-roll, and an infinite number of small needles are placed on the surface of the foam. By making the holes, the communication of the bubbles can be promoted.
高エチレンタイプのＥＰＤＭ樹脂（商品名：エスプレン５１２Ｆ、エチレン含有量６５重量％、住友化学株式会社製）７５重量部と、高ムーニー粘度のＥＰＤＭ樹脂（商品名：エスプレン６００Ｆ、ムーニー粘度６３ＭＬ（１＋４）１００℃、５０％油展、住友化学株式会社製）２５重量部、脂肪酸の表面処理を施したコロイド炭酸カルシウム（平均粒子径５０ｎｍ）１５重量部、プロセスオイル５５重量部、タルク３５重量部、充填剤（物質名：重質炭酸カルシウム）６５重量部、アゾジカルボンアミド２５重量部、硫黄粉３重量部、発泡助剤（物質名：尿素系複合剤）６重量部及び加硫促進剤（２−メルカプトベンゾチアゾール）５重量部からなる組成物を１１０℃に加熱された、プレス内の金型（３０×１５０×１５０ｍｍ）に充填し、１００ｋｇ／ｃｍ２の圧力で４５分間加熱し、中間発泡体（３２×１５５×１５５ｍｍ）を生成した。 75 parts by weight of high ethylene type EPDM resin (trade name: Esprene 512F, ethylene content 65% by weight, manufactured by Sumitomo Chemical Co., Ltd.) and high Mooney viscosity EPDM resin (trade name: Esprene 600F, Mooney viscosity 63ML (1 + 4) 100 ° C, 50% oil exhibition, Sumitomo Chemical Co., Ltd.) 25 parts by weight, fatty acid surface-treated colloidal calcium carbonate (average particle size 50 nm) 15 parts by weight, process oil 55 parts by weight, talc 35 parts by weight, filling 65 parts by weight of agent (substance name: heavy calcium carbonate), 25 parts by weight of azodicarbonamide, 3 parts by weight of sulfur powder, 6 parts by weight of foaming aid (substance name: urea complex) and vulcanization accelerator (2- A composition consisting of 5 parts by weight of a mercaptobenzothiazole) was charged into a mold (30 × 150 × 150 mm) in a press heated to 110 ° C., Heated at a pressure of 100 kg / cm 2 for 45 minutes to produce an intermediate foam (32 × 155 × 155 mm).
次いで、中間発泡体を気密でない金型（８０×４７０×４７０ｍｍ）の略中央に載置し、１２５℃で８０分間加熱して取り出し、発泡体（８０×５００×５００ｍｍ）を得た。 Next, the intermediate foam was placed in the approximate center of a mold (80 × 470 × 470 mm) that was not airtight, heated at 125 ° C. for 80 minutes, and taken out to obtain a foam (80 × 500 × 500 mm).
得られた発泡体をロール間隔２０ｍｍに設定した等速二本ロールの間を５回通化させて気泡膜を破壊させ、気泡の連通化を行った。 The obtained foam was passed 5 times between two constant-velocity rolls set at a roll interval of 20 mm to break the cell membrane and to connect the cells.
得られた発泡体の見掛け密度は７３ｋｇ／ｍ３、連続気泡率８０〜１００％であり、白色の弾力性のあるＥＰＤＭ発泡体が得られた。 The apparent density of the obtained foam was 73 kg / m 3 , the open cell ratio was 80 to 100%, and a white elastic EPDM foam was obtained.
ＥＰＤＭ樹脂の比率を高エチレンタイプ９０重量部と、高ムーニー粘度タイプ１０重量部に変えた以外は実施例１と同じ配合及び条件で発泡させ、発泡体を得た。 Foam was obtained by foaming under the same composition and conditions as in Example 1 except that the ratio of the EPDM resin was changed to 90 parts by weight of the high ethylene type and 10 parts by weight of the high Mooney viscosity type.
得られた発泡体の見掛け密度は７５ｋｇ／ｍ３であり、白色の弾力性のあるＥＰＤＭ発泡体が得られた。 The apparent density of the obtained foam was 75 kg / m 3 , and a white elastic EPDM foam was obtained.
ＥＰＤＭ樹脂の比率を高エチレンタイプ７０重量部と、高ムーニー粘度タイプ３０重量部に変えた以外は実施例１と同じ配合及び条件で発泡させ、発泡体を得た。 Foam was obtained by foaming under the same composition and conditions as in Example 1 except that the ratio of the EPDM resin was changed to 70 parts by weight of the high ethylene type and 30 parts by weight of the high Mooney viscosity type.
得られた発泡体の見掛け密度は７６ｋｇ／ｍ３であり、白色の弾力性のあるＥＰＤＭ発泡体が得られた。 The apparent density of the obtained foam was 76 kg / m 3 , and a white elastic EPDM foam was obtained.
表面処理をされた炭酸カルシウムを３０重量部に変えた以外は実施例１と同じ配合及び条件で発泡させ、発泡体を得た。 Foam was obtained by foaming under the same composition and conditions as in Example 1 except that the surface-treated calcium carbonate was changed to 30 parts by weight.
得られた発泡体の見掛け密度は７６ｋｇ／ｍ３であり、白色の弾力性のあるＥＰＤＭ発泡体が得られた。
比較例１
The apparent density of the obtained foam was 76 kg / m 3 , and a white elastic EPDM foam was obtained.
Comparative Example 1
ＥＰＤＭ樹脂の比率を高エチレンタイプ９５重量部と、高ムーニー粘度タイプ５重量部に変えた以外は実施例１と同じ配合及び条件で発泡させたが、ガス抜けがひどく、満足な発泡体を得ることが出来なかった。
比較例２
Except that the ratio of the EPDM resin was changed to 95 parts by weight of the high ethylene type and 5 parts by weight of the high Mooney viscosity type, foaming was performed under the same composition and conditions as in Example 1, but the gas escape was severe and a satisfactory foam was obtained. I couldn't.
Comparative Example 2
ＥＰＤＭ樹脂の比率を高エチレンタイプ６５重量部と、高ムーニー粘度タイプ３５重量部に変えた以外は実施例１と同じ配合及び条件で発泡させたが、割れがひどく、満足な発泡体を得ることが出来なかった。
比較例３
Except for changing the ratio of EPDM resin to 65 parts by weight of high ethylene type and 35 parts by weight of high Mooney viscosity type, foaming was carried out under the same composition and conditions as in Example 1, but cracking was severe and a satisfactory foam was obtained. I couldn't.
Comparative Example 3
表面処理をされた炭酸カルシウムを５重量部に変えた以外は実施例１と同じ配合及び条件で発泡させたが、収縮がひどく、満足な発泡体を得ることが出来なかった。
比較例４
Except for changing the surface-treated calcium carbonate to 5 parts by weight, foaming was carried out under the same composition and conditions as in Example 1, but the shrinkage was severe and a satisfactory foam could not be obtained.
Comparative Example 4
表面処理をされた炭酸カルシウムを４０重量部に変えた以外は実施例１と同じ配合及び条件で発泡させたが、割れがひどく、満足な発泡体を得ることが出来なかった。
比較例５
Except for changing the surface-treated calcium carbonate to 40 parts by weight, foaming was carried out under the same composition and conditions as in Example 1, but cracking was severe and a satisfactory foam could not be obtained.
Comparative Example 5
表面処理をされた炭酸カルシウムの粒子径を１５０ｎｍ（商品名：Ｖｉｇｏｔ−１５、表面脂肪酸処理、白石工業株式会社製）１５重量部に変えた以外は実施例１と同じ配合及び条件で発泡させたが、収縮がひどく、満足な発泡体を得ることが出来なかった。 The particle diameter of the surface treated calcium carbonate was changed to 15 parts by weight of 150 nm (trade name: Vigot-15, surface fatty acid treatment, manufactured by Shiraishi Kogyo Co., Ltd.), and foamed under the same composition and conditions as in Example 1. However, the shrinkage was severe and a satisfactory foam could not be obtained.
以上のように、本発明の方法によれば、白色系ＥＰＤＭ発泡体を製造できる。また、黄色や赤色等の顔料を添加すれば、黄色や赤色等のＥＰＤＭ発泡体を得ることが出来る。本発明の方法によって製造された白色系ＥＰＤＭ発泡体は、断熱材やクッション材等の工業用途以外に、多様な色を作ることができることから、雑貨等の用途に適用できる。
As described above, according to the method of the present invention, a white EPDM foam can be produced. Moreover, if pigments, such as yellow and red, are added, EPDM foams, such as yellow and red, can be obtained. The white EPDM foam produced by the method of the present invention can be used for various kinds of goods such as a heat insulating material and a cushion material because it can produce various colors.
Claims (4)
The method for producing a foam according to claim 3, wherein the surface treatment agent for calcium carbonate is a fatty acid and the particle diameter is 100 nm or less.
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