JPH0148132B2 - - Google Patents
Info
- Publication number
- JPH0148132B2 JPH0148132B2 JP57182208A JP18220882A JPH0148132B2 JP H0148132 B2 JPH0148132 B2 JP H0148132B2 JP 57182208 A JP57182208 A JP 57182208A JP 18220882 A JP18220882 A JP 18220882A JP H0148132 B2 JPH0148132 B2 JP H0148132B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- ethylene
- present
- density
- 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
Links
- -1 polyethylene Polymers 0.000 claims description 15
- 239000004711 α-olefin Substances 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 13
- 229920000573 polyethylene Polymers 0.000 claims description 13
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 12
- 229920006280 packaging film Polymers 0.000 claims description 12
- 239000012785 packaging film Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011342 resin composition Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 19
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 229920013716 polyethylene resin Polymers 0.000 description 4
- 239000005033 polyvinylidene chloride Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 1
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 1
- 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
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001155 polypropylene 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
- 150000003254 radicals Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
Description
本発明は包装用フイルムの製造方法に関し、詳
しくは自己粘着性にすぐれ、しかもカツト性や透
明性にすぐれた包装用フイルムの製造方法に関す
る。
従来、家庭用、業務用に用いられるいわゆるラ
ツプフイルムとしては、ポリ塩化ビニリデン樹脂
や高圧法ポリエチレン樹脂を製膜してなるフイル
ムが実用化されている。これらラツプフイルムと
しては、自己粘着性（ラツプ性）の他に使用時の
カツト性、強度、透明性、耐熱性などの性能が要
求されている。
しかしながら、ポリ塩化ビニリデン樹脂やポリ
塩化ビニル樹脂は塩素を多量に含んでいるため、
焼却時に塩素ガスを発生したり、多量に含まれる
可塑剤の有害性などが問題となつている。このた
め、このような問題点のない高圧法ポリエチレン
樹脂も使用されているが、これ自身自己粘着性が
非常に低く、種々の粘着付与剤を添加しなければ
ならず、水気の多いものに対してラツプ性が劣る
という欠点を有している。
また、ポリ塩化ビニリデン製ラツプフイルム
は、二軸延伸されているためカツト時に斜めに裂
けやすく、また電子レンジで加熱した場合など著
しく収縮する。一方、ポリエチレン製ラツプフイ
ルムは耐熱性が十分ではなく、従つて近時めざま
しく普及している電子レンジで調理、加熱する場
合に使用すると、フイルムが収縮して破損した
り、あるいはフイルム同士が融着して破れたり溶
融して容器などに付着したりするため、その用途
は大幅に制限されている。
これらの問題点を解消するものとして、高密度
ポリエチレン樹脂、ポリプロピレン樹脂を用いる
ことも提案されているが、これらは耐熱性という
点では満足できるものであるが自己粘着性やカツ
ト性が十分でないという欠点を有している。他
方、エチレン−α−オレフイン共重合体に高圧法
ポリエチレン樹脂を配合する方法（特公昭54−
25952号）や高圧法ポリエチレン樹脂を積層する
方法（特開昭55−41298号）が提案されている。
しかしながら、これらの方法で得られるフイル
ムは必ずしも自己粘着性が十分でなく、高圧法ポ
リエチレンの配合量が多くなるとラツプ性が低下
し、また配合量が少ないとカツト性が悪くなるな
ど、包装用フイルムとしての機能を十分に果たす
ことができないものであつた。
本発明はこれらの欠点を解消した包装用フイル
ムの製造方法を提供することを目的とするもので
ある。
すらわち本発明は、密度0.900ｇ／cm3以上0.928
ｇ／cm3未満の高圧法ポリエチレン85〜45重量％に
密度0.900ｇ／cm3〜0.940ｇ／cm3、α−オレフイン
の含有量が１〜15重量％であるエチレン−α−オ
レフイン共重合体15〜55重量％を配合してなる樹
脂組成物を押出温度230〜330℃で押出成形して製
膜することを特徴とする包装用フイルムの製造方
法を提供するものである。
本発明の方法において用いる高圧法ポリエチレ
ンとしては、密度0.900ｇ／cm3以上0.928ｇ／cm3未
満のものであり、好ましくは0.910ｇ／cm3〜0.928
ｇ／cm3のものである。
密度0.900ｇ／cm3以上0.928ｇ／cm3未満の高圧法
ポリエチレンは通常、酸素、ベンゾイルバーオキ
サイド、ラウロイルパーオキサイドなどの遊離基
開始剤を用いて公知の方法で製造されるものであ
る。この高圧法ポリエチレンとしてはエチレンの
単独重合体のみならず他の少量の重合性単量体、
たとえば酢酸ビニル、アクリル酸エステルなどの
共重合体あるいはこれらの混合物であつてもよ
い。ここで高圧法ポリエチレンのメルトインデツ
クス（MI）としては、0.1〜100ｇ／10分、好ま
しくは0.3〜50ｇ／10分の範囲のものが用いられ
る。
次に本発明の方法において用いる第二成分とし
てのエチレン−α−オレフイン共重合体は、エチ
レンと炭素数３〜20個、好ましくは炭素数４〜12
個のα−オレフインとの共重合体であり、低圧法
あるいは中圧法によつて得られる直鎖状ポリエチ
レン共重合体である。
ここでα−オレフインとしては、プロピレン、
ブテン−１、ペンテン−１、ヘキセン−１、４−
メチルペンテン−１、オクテン−１、デセン−
１、ドデセン−１などがあり、これらは単独で用
いてもよく、あるいは２種以上を組合せて用いて
もよい。エチレン−α−オレフイン共重合体中に
おけるこれらα−オレフインの含有量は１〜15重
量％である。
またエチレン−α−オレフイン共重合体の密度
は0.900〜0.940ｇ／cm3、好ましくは0.915〜0.935
ｇ／cm3で、MIは0.1〜100ｇ／10分、好ましくは
0.5〜50ｇ／10分、特に好ましくは２〜50ｇ／10
分である。密度が0.940ｇ／cm3を越えると透明性
が低下し、弾性が過多となるとともに自己粘着性
も低下するので好ましくない。また0.900ｇ／cm3
未満だと粘着性が過多となり好ましくない。
本発明にあつては、エチレン−α−オレフイン
共重合体は、密度0.900〜0.940ｇ／cm3のものを主
成分とするものであれば、単独で用いてもよいし
二種以上の混合物を用いてもよい。また使用目的
によつては、さらに必要により上記密度外のエチ
レン−α−オレフイン共重合体を加えることを制
限するものではない。
本発明の方法に用いる樹脂組成物における高圧
法ポリエチレンとエチレン−α−オレフイン共重
合体との配合比は、高圧法ポリエチレン85〜45重
量％とエチレン−α−オレフイン共重合体15〜55
重量％である。高圧法ポリエチレンが85重量％を
超えると押出温度300℃以上で高温成形しても十
分な自己粘着性が得られず、またエチレン−α−
オレフイン共重合体が55重量％を超えるとカツト
性が悪く、ラツプフイルムとして不適当である。
このようにしてなる樹脂組成物をＴ−ダイ法あ
るいはインフレーシヨン法によつて溶融押出製膜
して包装用フイルムを得る。ここで押出温度は
230〜330℃、好ましくは240〜320℃である。230
℃未満では自己粘着性が小さく、また330℃を超
えるとフイルムの強度および腰の強さが著しく低
下しラツプフイルムとして不適当である。このよ
うに本発明の方法においては比較的高い温度で押
出すので、カツト性を維持したまま、自己粘着性
の高められたフイルムを得ることが可能である。
なお、本発明の方法においては、高圧法ポリエ
チレンとエチレン−α−オレフイン共重合体の配
合比、用途などによつては最適の自己粘着性、フ
イルム引出性、カツト性、成形性などを得るため
に樹脂組成物中に滑剤やアンチブロツキング剤な
どの添加剤を適宜加えることもできる。これら添
加剤としてはステアリン酸カルシウム、ステアリ
ン酸バリウムなどの金属石けん、ステアリン酸ア
ミド、パルミチン酸アミドなどの脂肪酸アミド、
ステアリン酸モノグリセライドや粉末シリカ、ケ
イ藻土、カオリン、タルクなどが挙げられる。こ
のような添加剤の配合量はフイルムのラツプ性等
を考慮して０〜0.5重量％の範囲とすることが好
ましい。また、必要に応じて防曇剤、帯電防止剤
などを添加してもよい。
本発明の方法によつて得られる包装用フイルム
は通常厚み５〜50μ、好適には８〜30μの範囲で
ある。
本発明の方法により得られる包装用フイルムは
自己粘着性にすぐれたものであり、水気の多い食
品などに対しても良好なラツプ性を示すと同時に
良好なカツト性を示すものである。しかも、本発
明の方法によれば、高温、高速成形が可能とな
り、耐熱性、透明性にすぐれた包装用フイルムを
生産性良く得ることが可能である。
また、本発明の方法においては原則として粘着
付与剤や非イオン性界面活性剤、さらには滑剤、
アンチブロツキング剤などの添加剤を用いないた
め無色、無臭の包装用フイルムを得ることができ
る。しかも、本発明の方法により得られる包装用
フイルムはポリ塩化ビニル樹脂やポリ塩化ビニリ
デン樹脂製のラツプフイルムよりも食品衛性上な
らびに焼却時の安全性にすぐれたものである。
したがつて、本発明の方法は家庭用、業務用ラ
ツプフイルムや各種ストレツチ包装用フイルムの
製造方法として有用である。
次に本発明を実施例により説明する。
実施例１〜９および比較例１〜７
第１表に示す配合組成物を、Ｔ−ダイ方式フイ
ルム成形機（押出機50mmφ、Ｌ／Ｄ＝26、ダイス
500ｍ巾、ダイリツプ0.8mm）を用いて押出した
後、20℃の水を通したチルロールを介して急冷固
化し、厚み11〜13μのフイルムを得た。得られた
フイルムの物性、ラツプフイルムとしての性能を
成形性の評価と共に第１表に示す。
The present invention relates to a method for producing a packaging film, and more particularly to a method for producing a packaging film that has excellent self-adhesiveness, cutting properties, and transparency. Conventionally, films made from polyvinylidene chloride resin or high-pressure polyethylene resin have been put into practical use as so-called wrap films used for household and commercial purposes. In addition to self-adhesiveness (wrappability), these wrap films are required to have such properties as cutability, strength, transparency, and heat resistance during use. However, since polyvinylidene chloride resin and polyvinyl chloride resin contain large amounts of chlorine,
Problems include the generation of chlorine gas during incineration and the toxicity of large amounts of plasticizers. For this reason, high-pressure polyethylene resins that do not have these problems are also used, but these resins themselves have very low self-adhesiveness and require the addition of various tackifiers, making them difficult to use for wet materials. However, it has the disadvantage of poor wrapability. In addition, polyvinylidene chloride wrap film is biaxially stretched, so it tends to tear diagonally when cut, and also shrinks significantly when heated in a microwave oven. On the other hand, polyethylene wrap film does not have sufficient heat resistance, so if it is used for cooking or heating in microwave ovens, which are becoming increasingly popular these days, the film may shrink and break, or the films may fuse together. Its use is severely limited because it can tear or melt and adhere to containers, etc. To solve these problems, it has been proposed to use high-density polyethylene resin and polypropylene resin, but although these are satisfactory in terms of heat resistance, they do not have sufficient self-adhesion or cutting properties. It has drawbacks. On the other hand, a method of blending a high-pressure polyethylene resin with an ethylene-α-olefin copolymer (Japanese Patent Publication No. 1973-
25952) and a method of laminating high-pressure polyethylene resin (Japanese Patent Application Laid-Open No. 55-41298). However, the films obtained by these methods do not necessarily have sufficient self-adhesiveness, and when the amount of high-pressure polyethylene blended is large, the wrapping properties decrease, and when the blended amount is small, the cutting properties are poor. It was not possible to fully fulfill its functions. The object of the present invention is to provide a method for producing a packaging film that eliminates these drawbacks. The present invention has a density of 0.900 g/cm 3 or more, 0.928
Ethylene-α-olefin copolymer having a density of 0.900 g/cm 3 to 0.940 g/cm 3 and an α-olefin content of 1 to 15% by weight in high-pressure polyethylene of less than 85 to 45% by weight of g/cm 3 The present invention provides a method for producing a packaging film, which comprises forming a film by extrusion molding a resin composition containing 15 to 55% by weight at an extrusion temperature of 230 to 330°C. The high-pressure polyethylene used in the method of the present invention has a density of 0.900 g/cm 3 or more and less than 0.928 g/cm 3 , preferably 0.910 g/cm 3 to 0.928 g/cm 3 .
g/ cm3 . High-pressure polyethylene having a density of 0.900 g/cm 3 or more and less than 0.928 g/cm 3 is usually produced by a known method using oxygen and a free radical initiator such as benzoyl peroxide or lauroyl peroxide. This high-pressure polyethylene contains not only ethylene homopolymer but also small amounts of other polymerizable monomers,
For example, it may be a copolymer of vinyl acetate, acrylic ester, etc., or a mixture thereof. Here, the melt index (MI) of the high-pressure polyethylene used is in the range of 0.1 to 100 g/10 minutes, preferably 0.3 to 50 g/10 minutes. Next, the ethylene-α-olefin copolymer as the second component used in the method of the present invention contains ethylene and 3 to 20 carbon atoms, preferably 4 to 12 carbon atoms.
It is a linear polyethylene copolymer obtained by a low-pressure method or a medium-pressure method. Here, as α-olefin, propylene,
Butene-1, Pentene-1, Hexene-1, 4-
Methylpentene-1, octene-1, decene-
1, dodecene-1, etc., and these may be used alone or in combination of two or more. The content of these α-olefins in the ethylene-α-olefin copolymer is 1 to 15% by weight. The density of the ethylene-α-olefin copolymer is 0.900 to 0.940 g/cm 3 , preferably 0.915 to 0.935.
g/ cm3 , MI is 0.1-100g/10min, preferably
0.5-50g/10 min, particularly preferably 2-50g/10
It's a minute. If the density exceeds 0.940 g/cm 3 , transparency decreases, elasticity becomes excessive, and self-adhesiveness decreases, which is not preferable. Also 0.900g/ cm3
If it is less than that, it becomes too sticky, which is not preferable. In the present invention, the ethylene-α-olefin copolymer may be used alone or as a mixture of two or more, as long as it has a density of 0.900 to 0.940 g/cm 3 as the main component. May be used. Further, depending on the purpose of use, it is not limited to adding an ethylene-α-olefin copolymer having a density other than the above-mentioned density if necessary. The blending ratio of high-pressure polyethylene and ethylene-α-olefin copolymer in the resin composition used in the method of the present invention is 85 to 45% by weight of high-pressure polyethylene and 15 to 55% by weight of ethylene-α-olefin copolymer.
Weight%. If the content of high-pressure polyethylene exceeds 85% by weight, sufficient self-adhesiveness cannot be obtained even when molded at an extrusion temperature of 300°C or higher, and ethylene-α-
If the olefin copolymer content exceeds 55% by weight, the cuttability will be poor and the film will be unsuitable as a wrap film. The resin composition thus obtained is melt-extruded into a film by a T-die method or an inflation method to obtain a packaging film. Here the extrusion temperature is
The temperature is 230-330°C, preferably 240-320°C. 230
If the temperature is less than 330°C, the self-adhesiveness will be low, and if the temperature exceeds 330°C, the strength and elasticity of the film will drop significantly, making it unsuitable for use as a wrap film. As described above, in the method of the present invention, since extrusion is performed at a relatively high temperature, it is possible to obtain a film with improved self-adhesiveness while maintaining cuttability. In addition, in the method of the present invention, depending on the blending ratio of high-pressure polyethylene and ethylene-α-olefin copolymer, the use, etc., in order to obtain optimal self-adhesiveness, film drawability, cuttability, moldability, etc. Additives such as lubricants and antiblocking agents can also be added to the resin composition as appropriate. These additives include metal soaps such as calcium stearate and barium stearate, fatty acid amides such as stearic acid amide and palmitic acid amide,
Examples include stearic acid monoglyceride, powdered silica, diatomaceous earth, kaolin, and talc. The amount of such additives to be added is preferably in the range of 0 to 0.5% by weight, taking into account the film's wrapping properties. Further, an antifogging agent, an antistatic agent, etc. may be added as necessary. The packaging film obtained by the method of the present invention usually has a thickness in the range of 5 to 50 microns, preferably 8 to 30 microns. The packaging film obtained by the method of the present invention has excellent self-adhesiveness and exhibits good wrapping properties even for moist foods, as well as good cutting properties. Moreover, according to the method of the present invention, high-temperature, high-speed molding is possible, and packaging films with excellent heat resistance and transparency can be obtained with high productivity. In addition, in the method of the present invention, in principle, tackifiers, nonionic surfactants, lubricants,
Since additives such as anti-blocking agents are not used, a colorless and odorless packaging film can be obtained. Moreover, the packaging film obtained by the method of the present invention is superior in terms of food hygiene and safety during incineration than wrap films made of polyvinyl chloride resin or polyvinylidene chloride resin. Therefore, the method of the present invention is useful as a method for producing wrap films for home and commercial use and various stretch packaging films. Next, the present invention will be explained by examples. Examples 1 to 9 and Comparative Examples 1 to 7 The blended compositions shown in Table 1 were processed using a T-die type film forming machine (extruder 50 mmφ, L/D = 26, die
After extrusion using a 500 m width die lip 0.8 mm), the film was rapidly cooled and solidified via a chill roll through which water at 20° C. was passed, to obtain a film with a thickness of 11 to 13 μm. The physical properties of the obtained film and its performance as a wrap film are shown in Table 1 along with evaluation of moldability.
【表】【table】
Claims (1)
法ポリエチレン85〜45重量％に密度0.900ｇ／cm3
〜0.940ｇ／cm3、α−オレフインの含有量が１〜
15重量％であるエチレン−α−オレフイン共重合
体15〜55重量％を配合してなる樹脂組成物を押出
温度230〜330℃で押出成形して製膜することを特
徴とする包装用フイルムの製造方法。1 High-pressure polyethylene with a density of 0.900 g/cm 3 or more and less than 0.928 g/cm 3 and a density of 0.900 g/cm 3 to 85 to 45% by weight
〜0.940g/cm 3 , α-olefin content is 1〜
A packaging film characterized in that it is produced by extruding a resin composition containing 15 to 55% by weight of an ethylene-α-olefin copolymer at an extrusion temperature of 230 to 330°C. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57182208A JPS5971824A (en) | 1982-10-19 | 1982-10-19 | Manufacture of packaging film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57182208A JPS5971824A (en) | 1982-10-19 | 1982-10-19 | Manufacture of packaging film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5971824A JPS5971824A (en) | 1984-04-23 |
| JPH0148132B2 true JPH0148132B2 (en) | 1989-10-18 |
Family
ID=16114240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57182208A Granted JPS5971824A (en) | 1982-10-19 | 1982-10-19 | Manufacture of packaging film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5971824A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5331751A (en) * | 1976-09-03 | 1978-03-25 | Jujo Paper Co Ltd | Packaging film |
| JPS5597928A (en) * | 1979-01-20 | 1980-07-25 | Jujo Paper Co Ltd | Production of packing film |
| JPS58122826A (en) * | 1982-01-16 | 1983-07-21 | Mitsubishi Chem Ind Ltd | Manufacture of polyethylene film |
-
1982
- 1982-10-19 JP JP57182208A patent/JPS5971824A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5331751A (en) * | 1976-09-03 | 1978-03-25 | Jujo Paper Co Ltd | Packaging film |
| JPS5597928A (en) * | 1979-01-20 | 1980-07-25 | Jujo Paper Co Ltd | Production of packing film |
| JPS58122826A (en) * | 1982-01-16 | 1983-07-21 | Mitsubishi Chem Ind Ltd | Manufacture of polyethylene film |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5971824A (en) | 1984-04-23 |
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