JPH0423655B2 - - Google Patents
Info
- Publication number
- JPH0423655B2 JPH0423655B2 JP59077184A JP7718484A JPH0423655B2 JP H0423655 B2 JPH0423655 B2 JP H0423655B2 JP 59077184 A JP59077184 A JP 59077184A JP 7718484 A JP7718484 A JP 7718484A JP H0423655 B2 JPH0423655 B2 JP H0423655B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- extruded
- weight
- foaming
- density
- 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 - Lifetime
Links
- 239000006260 foam Substances 0.000 claims description 33
- -1 polyethylene Polymers 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000005187 foaming Methods 0.000 claims description 9
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 9
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 239000004088 foaming agent Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 description 8
- 239000004702 low-density polyethylene Substances 0.000 description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000004604 Blowing Agent Substances 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 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
- 238000005516 engineering process Methods 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000001294 propane Substances 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
- 239000000377 silicon dioxide Substances 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
-
- 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
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
- B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
-
- 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
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0063—Density
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
本発明はポリエチレン押出発泡体の製造方法に
関する。
ポリエチレン押出発泡体は、緩衝材、断熱材、
包装材、建築部材等の各種用途に広く用いられて
いる。この種押出発泡体のうち特に薄肉のシート
状の押出発泡体はダイリツプのクリアランスを狭
くして押出すとともに、押出速度に比して押出発
泡体の引取速度を速くして発泡体を引張り薄肉と
することにより製造されるが、発泡成形性、柔軟
性に優れることから近年広く用いられている低密
度ポリエチレン（多分岐状骨格を有する低密度ポ
リエチレン：以下LDPEと略称する。）を押出発
泡せしめてなる発泡体は伸びが小かく引張強度に
劣るため薄肉にして引張ると切断しやすく、この
ため長尺な薄肉のシート状の押出発泡体を製造し
難い欠点を有していた。
本発明者らは上記従来技術の欠点を解消すべく
鋭意研究した結果特定の密度、メルトフローレイ
トおよび分子量分布を有する、直鎖低密度ポリエ
チレンを押出発泡せしめることにより、従来の
LDPE押出発泡体の長所を有するとともに、
LDPE押出発泡体の欠点であつた伸び、引張強
度、耐候性等を改良でき、特に長尺な薄肉のシー
ト状の押出発泡体を容易に製造し得ることを見い
出し本発明を完成するに至つた。
即ち本発明は、密度0.920〜0.940ｇ／cm3、メル
トフローレイト0.3〜10ｇ／10分を有しかつ重量
平均分子量Mwと数平均分子量Mnとの間に
Mw／Mn４なる関係を有する、直鎖低密度ポ
リエチレンと発泡剤とを溶融混練して押出発泡せ
しめることを特徴とするポリエチレン押出発泡体
の製造方法を要旨とする。
本発明に用いられる直鎖低密度ポリエチレン
（以下LLDPEと略称する）は、エチレンと炭素数
３〜８のα−オレフイン（α−オレフイン0.5〜
10モル％程度）とを共重合せしめてなるポリエチ
レンで通常分岐鎖の炭素数８以下の直鎖状骨格を
有する。上記α−オレフインとしてはプロピレ
ン、ブテン−１、ヘキセン−１、ヘプテン−１、
オクテン−１，４−メチルペンテン−１等が挙げ
られる。
上記LLDPEは密度0.920〜0.940ｇ／cm3、メルト
フローレイト（以下MFRと略称する。）0.3〜10
ｇ／10分を有しかつ重量平均分子量Mwと数平均
分子量Mnとの間にMw／Mn４なる関係を有す
るものが用いられる。密度が0.920ｇ／cm3未満の
ものを用いた場合は得られる発泡体の剛性（腰の
強さ）等に劣り、0.940ｇ／cm3を越えるものを用
いた場合は柔軟性、引張強度、伸び等に劣る。ま
たMFRが0.3ｇ／10分未満のものを用いた場合
は、溶融時の粘度が高く押出発泡が困難となり逆
にMFRが10ｇ／10分を超えるものを用いた場合
は、溶融時の粘度が低下しすぎるため押出発泡体
の発泡倍率が低下したり、連続気泡になり易い等
の問題を生じる。更にLLDPEの分子量分布が狭
く、Mw／Mn＜４となるものを用いた場合は押
出発泡に適した粘度となる温度範囲が狭くなり、
僅かな温度の違いにより溶融時の粘度が大幅に変
化して押出発泡成形性が低下するため押出発泡適
正温度の調節が困難となる。
本発明においては上記LLDPEを、発泡剤とと
もに通常用いられる押出機で加圧下に溶融混練し
た後押出機内より低圧の雰囲気に押出発泡せしめ
る。このとき用いられる発泡剤としては二酸化炭
素等の無機ガス、プロパン、ブタン、ペンタン、
ヘキサン、ブタジエン、メチレンクロライド、ジ
クロロジフロロメタン、トリクロロモノフロロメ
タン、モノクロロトリフロロメタン等の揮発性発
泡剤、アゾジカルボンアミド、ジニトロソペンタ
メチレンテトラミン、アゾビスイソブチロニトリ
ル、Ｐ，P′−オキシビスベンゼンスルホニルヒド
ラジド、重炭酸ナトリウム等の分解型発泡剤等が
挙げられる。また発泡に際し発泡体の気泡調整剤
として少量のタルク、シリカ等の無機質粉末また
は多価カルボン酸と重炭酸ナトリウムの混合物、
反応生成物等が用いられる。上記発泡剤、気泡調
整剤の添加量は通常樹脂100重量部に対して各々
５〜40重量部、0.05〜2.0重量部である。
本発明によれば発泡倍率５〜50倍、厚さ0.3〜
５mmのポリエチレン押出発泡体を製造することが
できるが、特に厚さ0.3〜３mmの長尺な薄肉のシ
ート状ポリエチレン押出発泡体を容易かつ良好に
製造することができる。
尚、本発明の目的をさまたげない範囲において
他の樹脂、例えばLDPEを適宜量混合することが
できるが通常他の樹脂の混合量は60重量％未満、
好ましくは30重量％以下である。
以上説明したように本発明によれば、従来の
LDPE押出発泡体の長所を維持するとともに
LDPE押出発泡体の欠点であつた伸び、引張強度
等を改良したポリエチレン押出発泡体を容易に製
造することができ、特に薄肉の押出発泡体の製造
の際に押出速度に対して引取速度を大きくして該
発泡体を引張つた場合でも押出発泡体が途中で切
断する虞れがなく、容易に長尺な薄肉のシート状
ポリエチレン押出発泡体を製造することができる
等の効果を有する。
以下実施例を挙げて本発明を更に詳細に説明す
る。
実施例１〜３、比較例１〜３
第１表に示す直鎖低密度ポリエチレン樹脂100
重量部にブタン20重量部およびタルク1.5重量部
を添加して押出機内で溶融混練した後押出機より
押出して発泡せしめて薄肉の発泡シートの製造を
行なつた。押出発泡に際しての押出発泡成形性お
よび得られた発泡シートの性状を第１表にあわせ
て示す。
The present invention relates to a method for manufacturing extruded polyethylene foam. Polyethylene extruded foam can be used as cushioning material, insulation material,
It is widely used for various purposes such as packaging materials and building materials. Among these types of extruded foams, particularly thin-walled sheet-like extruded foams are extruded by narrowing the clearance of the die lip, and at the same time, the take-up speed of the extruded foam is increased compared to the extrusion speed to pull the foam and make it thin. It is manufactured by extruding and foaming low-density polyethylene (low-density polyethylene with a multi-branched skeleton: hereinafter abbreviated as LDPE), which has been widely used in recent years due to its excellent foam moldability and flexibility. Since the foam has low elongation and poor tensile strength, it is easy to cut when stretched thin and has the disadvantage that it is difficult to produce a long thin-walled extruded foam in the form of a sheet. The present inventors conducted intensive research to solve the above-mentioned drawbacks of the conventional technology, and as a result, by extruding and foaming linear low-density polyethylene having a specific density, melt flow rate, and molecular weight distribution,
With the advantages of LDPE extruded foam,
It was discovered that the elongation, tensile strength, weather resistance, etc., which were disadvantages of extruded LDPE foam, could be improved, and in particular, it was possible to easily produce long, thin-walled extruded foam in the form of a sheet, leading to the completion of the present invention. . That is, the present invention has a density of 0.920 to 0.940 g/cm 3 , a melt flow rate of 0.3 to 10 g/10 min, and has a weight average molecular weight Mw and a number average molecular weight Mn.
The gist of the present invention is a method for producing an extruded polyethylene foam, which is characterized by melt-kneading linear low-density polyethylene and a foaming agent, which have a relationship of Mw/Mn4, to form extruded foam. The linear low density polyethylene (hereinafter abbreviated as LLDPE) used in the present invention consists of ethylene and α-olefin having 3 to 8 carbon atoms (α-olefin 0.5 to
It is a polyethylene made by copolymerizing about 10% by mole) and usually has a branched linear skeleton with 8 or less carbon atoms. The above α-olefins include propylene, butene-1, hexene-1, heptene-1,
Examples include octene-1,4-methylpentene-1. The above LLDPE has a density of 0.920 to 0.940 g/cm 3 and a melt flow rate (hereinafter abbreviated as MFR) of 0.3 to 10.
g/10 min and a relationship between the weight average molecular weight Mw and the number average molecular weight Mn of Mw/Mn4 is used. If a foam with a density of less than 0.920 g/cm 3 is used, the resulting foam will have poor rigidity (strength), and if a density exceeds 0.940 g/cm 3 , the resulting foam will have poor flexibility, tensile strength, etc. Poor elongation, etc. Furthermore, if a material with an MFR of less than 0.3 g/10 minutes is used, the viscosity during melting will be high and extrusion foaming will be difficult; This decreases too much, resulting in problems such as a decrease in the expansion ratio of the extruded foam and a tendency to form open cells. Furthermore, when LLDPE has a narrow molecular weight distribution and Mw/Mn < 4, the temperature range at which the viscosity is suitable for extrusion foaming becomes narrower.
A slight difference in temperature significantly changes the viscosity at the time of melting, reducing extrusion foam moldability, making it difficult to adjust the appropriate temperature for extrusion foaming. In the present invention, the above-mentioned LLDPE is melt-kneaded together with a foaming agent under pressure in a commonly used extruder, and then extruded and foamed in a low-pressure atmosphere from inside the extruder. The blowing agents used at this time include inorganic gases such as carbon dioxide, propane, butane, pentane,
Volatile blowing agents such as hexane, butadiene, methylene chloride, dichlorodifluoromethane, trichloromonofluoromethane, monochlorotrifluoromethane, azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutyronitrile, P,P'- Examples include decomposable blowing agents such as oxybisbenzenesulfonyl hydrazide and sodium bicarbonate. In addition, a small amount of inorganic powder such as talc or silica or a mixture of polyhydric carboxylic acid and sodium bicarbonate may be used as a foam regulator during foaming.
Reaction products etc. are used. The amount of the above-mentioned foaming agent and cell regulator added is usually 5 to 40 parts by weight and 0.05 to 2.0 parts by weight, respectively, per 100 parts by weight of the resin. According to the present invention, the foaming ratio is 5 to 50 times, and the thickness is 0.3 to 50 times.
Extruded polyethylene foam with a thickness of 5 mm can be produced, and in particular, long thin-walled extruded polyethylene foam with a thickness of 0.3 to 3 mm can be easily and satisfactorily produced. In addition, other resins such as LDPE can be mixed in an appropriate amount within a range that does not impede the purpose of the present invention, but the amount of other resins usually mixed is less than 60% by weight.
Preferably it is 30% by weight or less. As explained above, according to the present invention, the conventional
While maintaining the advantages of LDPE extruded foam
It is possible to easily produce extruded polyethylene foam with improved elongation, tensile strength, etc., which were disadvantages of extruded LDPE foam, and especially when producing thin extruded foam, it is possible to increase the take-off speed relative to the extrusion speed. Even when the foam is stretched, there is no risk of the extruded foam being cut in the middle, and there are advantages such as being able to easily produce a long, thin, sheet-like extruded polyethylene foam. EXAMPLES The present invention will be explained in more detail with reference to Examples below. Examples 1 to 3, Comparative Examples 1 to 3 Linear low density polyethylene resin 100 shown in Table 1
20 parts by weight of butane and 1.5 parts by weight of talc were added to the parts by weight, melted and kneaded in an extruder, and then extruded from the extruder to foam to produce a thin foam sheet. Table 1 also shows the extrusion foam moldability during extrusion foaming and the properties of the obtained foamed sheet.
【表】【table】
Claims (1)
ト0.3〜10ｇ／10分を有しかつ重量平均分子量
Mwと数平均分子量Mnとの間にMw／Mn４な
る関係を有する、直鎖低密度ポリエチレンと発泡
剤とを溶融混練して押出発泡せしめることを特徴
とするポリエチレン押出発泡体の製造方法。1 having a density of 0.920 to 0.940 g/cm 3 , a melt flow rate of 0.3 to 10 g/10 min, and a weight average molecular weight
A method for producing an extruded polyethylene foam, which comprises melt-kneading linear low-density polyethylene and a foaming agent, which have a relationship of Mw/Mn4 between Mw and number average molecular weight Mn, and extrusion foaming.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59077184A JPS60220725A (en) | 1984-04-17 | 1984-04-17 | Preparation of polyethylene extruded foam |
| US06/723,835 US4649001A (en) | 1984-04-17 | 1985-04-16 | Process for producing polyethylene extruded foams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59077184A JPS60220725A (en) | 1984-04-17 | 1984-04-17 | Preparation of polyethylene extruded foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60220725A JPS60220725A (en) | 1985-11-05 |
| JPH0423655B2 true JPH0423655B2 (en) | 1992-04-22 |
Family
ID=13626724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59077184A Granted JPS60220725A (en) | 1984-04-17 | 1984-04-17 | Preparation of polyethylene extruded foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60220725A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6183211A (en) * | 1984-09-29 | 1986-04-26 | Toray Ind Inc | Ethylene copolymer for cellular material |
| US4692269A (en) * | 1985-09-25 | 1987-09-08 | Pennwalt Corporation | Gas-releasing composition for tailoring gas evolution of system |
| EP0254705A3 (en) * | 1986-07-25 | 1990-03-14 | Fina Research S.A. | Process for the manufacture of reticulated polyolefine foam as well as the product thus obtained |
| LU86529A1 (en) * | 1986-07-25 | 1988-02-02 | Labofina Sa | PROCESS FOR PRODUCING CROSSLINKED POLYOLEFIN FOAM AND FOAM THUS OBTAINED |
| JP2005255988A (en) * | 2004-02-10 | 2005-09-22 | Sumitomo Chemical Co Ltd | ETHYLENE-alpha-OLEFIN COPOLYMER FOR EXTRUSIVE EXPANSION MOLDING AND EXTRUSIVE EXPANSION MOLDED PRODUCT |
-
1984
- 1984-04-17 JP JP59077184A patent/JPS60220725A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60220725A (en) | 1985-11-05 |
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