JPS6329702B2 - - Google Patents
Info
- Publication number
- JPS6329702B2 JPS6329702B2 JP15010980A JP15010980A JPS6329702B2 JP S6329702 B2 JPS6329702 B2 JP S6329702B2 JP 15010980 A JP15010980 A JP 15010980A JP 15010980 A JP15010980 A JP 15010980A JP S6329702 B2 JPS6329702 B2 JP S6329702B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- film
- paper
- stiffness
- making
- 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
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 239000011342 resin composition Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】
本発明は特に角底袋製造に好適な紙状フイルム
を製造するための樹脂組成物に関する。
従来角底袋は紙を使用して種々の分野に使用さ
れており、又合成樹脂フイルムによる角底袋製造
も試みられているが、合成樹脂フイルムは紙に比
較してこし（スチフネス）が小さいため製袋工程
で把み具へのかかりが悪く、折りたたみ適性が不
足して折りたたんでも元に戻りシワも発生し、伸
びが大きくて引裂強度（TD）が高いため鋸歯状
切断が困難であり、すべり易くて二重の折縁が不
揃になる等問題が多くて実用化されていないのが
実状である。
本発明はこれらの問題を解決すべく種々検討の
結果到達したものであり、その要旨は、高密度ポ
リエチレン30〜80重量％、アイソタクチツクポリ
プロピレン10〜40重量％、エチレン酢ビコポリマ
ー５〜30重量％、タルク５〜40重量％よりなる紙
状フイルム製造用樹脂組成物、である。
本発明の組成物においては密度0.945ｇ／cm3以
上の高密度ポリエチレンを主成分として30〜80重
量％好ましくは50〜70重量％を使用して高結晶性
によるフイルム製造の安定性及びフイルムのこし
が得られるが、密度0.945ｇ／cm3未満ではフイル
ムのこしが不足し30重量％未満では前記安定性を
欠き80重量％を越えると伸びが大きく引裂強度
（TD）が高いため鋸歯状切断が困難となる。
アイソタクチツクポリプロピレン10〜40重量％
好ましくは20〜30重量％の添加により高密度ポリ
エチレンとの相乗作用からフイルムのこしが得ら
れるが、10重量％未満ではフイルムのこしが不足
し40重量％を越えるとフイルムの引裂強度
（TD）が高くなつて鋸歯状切断が困難となる。
又好ましくは酢ビ濃度３〜15重量％のエチレン
酢ビコポリマー５〜30重量％好ましくは10〜20重
量％を添加することによりフイルムに適度のすべ
りを与えて二重の折縁の揃をもたらせるが、５重
量％未満ではフイルムがすべり過ぎ30重量％を越
えるとフイルムのこしが低下し一方粘着性を帯び
て二重の折縁が不揃となり易い。
さらにタルクはフイルムの表面を粗にして紙状
の風合を出しこしを高めるが５〜40重量％好まし
くは10〜20重量％が適当であり、５重量％未満で
はフイルムのこしが不足し40重量％を越えると引
裂強度（TD）が低下しすぎて製袋しても実用に
耐えられない。
本発明の組成物により通常のインフレーシヨン
法、Ｔダイ法等で紙状フイルムが製造できる。又
必要に応じて帯電防止剤、着色剤等を添加しても
よい。
以下に本発明を実施例、比較例を挙げてさらに
詳細に説明する。
実施例１〜３、比較例１〜６
種々の樹脂組成物について80μ厚インフレーシ
ヨンフイルムを製造し、フイルム特性を測定し製
袋特性を調べた。その結果を第１表に示す。本発
明の組成物を用いると、スチフネスが高くて把み
具へのかかりが良く、引裂強度が低くてカツテイ
ング性が良好で、適度のすべりのため二重の折縁
の揃いが優れ、本発明の組成比を外れると諸特性
が劣る。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition for producing a paper-like film particularly suitable for producing square bottom bags. Conventionally, square bottom bags have been made of paper and used in various fields, and attempts have been made to manufacture square bottom bags using synthetic resin films, but synthetic resin films have less stiffness than paper. As a result, it is difficult to grip the bag during the bag-making process, and it is not suitable for folding, so it returns to its original shape even after folding, causing wrinkles.It also has high elongation and high tear strength (TD), making it difficult to cut into serrations. The reality is that it is slippery and has many problems such as uneven double folded edges, so it has not been put to practical use. The present invention was arrived at as a result of various studies to solve these problems, and its gist is that high-density polyethylene is 30 to 80% by weight, isotactic polypropylene is 10 to 40% by weight, and ethylene acetate copolymer is 5 to 30% by weight. This is a resin composition for producing a paper-like film comprising 5 to 40% by weight of talc. In the composition of the present invention, high-density polyethylene with a density of 0.945 g/cm 3 or more is used as the main component in an amount of 30 to 80% by weight, preferably 50 to 70% by weight, to improve film production stability and film straining due to high crystallinity. However, if the density is less than 0.945 g/ cm3 , the film will not have enough stiffness, if it is less than 30% by weight, it will lack the above stability, and if it exceeds 80% by weight, it will elongate and have a high tear strength (TD), making serration cutting difficult. becomes. Isotactic polypropylene 10-40% by weight
Preferably, by adding 20 to 30% by weight, film stiffness can be obtained due to the synergistic effect with high-density polyethylene, but if it is less than 10% by weight, the film will not have sufficient stiffness, and if it exceeds 40% by weight, the tear strength (TD) of the film will be high. This makes serration cutting difficult. Further, by adding 5 to 30% by weight, preferably 10 to 20% by weight of an ethylene acetate copolymer with a vinyl acetate concentration of 3 to 15% by weight, the film can be given appropriate slippage and the double folded edges can be aligned. However, if it is less than 5% by weight, the film will be too slippery, and if it exceeds 30% by weight, the stiffness of the film will decrease and it will become sticky, making the double folded edges likely to be uneven. Furthermore, talc roughens the surface of the film, gives it a paper-like texture, and increases stiffness, but the appropriate amount is 5 to 40% by weight, preferably 10 to 20% by weight. If it exceeds %, the tear strength (TD) will be too low to be practical even when making bags. A paper-like film can be produced from the composition of the present invention by a conventional inflation method, T-die method, or the like. Further, an antistatic agent, a coloring agent, etc. may be added as necessary. The present invention will be explained in more detail below by giving Examples and Comparative Examples. Examples 1 to 3, Comparative Examples 1 to 6 Inflation films with a thickness of 80 μm were produced using various resin compositions, and the film properties were measured and the bag making properties were investigated. The results are shown in Table 1. When the composition of the present invention is used, the stiffness is high and the gripping tool is good, the tear strength is low and the cutting property is good, and the double folded edges are excellently aligned due to moderate sliding. If the composition ratio is outside of this range, various properties will be deteriorated. 【table】
Claims (1)
クチツクポリプロピレン10〜40重量％、エチレン
酢ビコポリマー５〜30重量％、タルク５〜40重量
％よりなる紙状フイルム製造用樹脂組成物。1. A resin composition for producing a paper-like film comprising 30-80% by weight of high-density polyethylene, 10-40% by weight of isotactic polypropylene, 5-30% by weight of ethylene acetate copolymer, and 5-40% by weight of talc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15010980A JPS5774343A (en) | 1980-10-28 | 1980-10-28 | Resin composition for preparing paper-like film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15010980A JPS5774343A (en) | 1980-10-28 | 1980-10-28 | Resin composition for preparing paper-like film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5774343A JPS5774343A (en) | 1982-05-10 |
| JPS6329702B2 true JPS6329702B2 (en) | 1988-06-15 |
Family
ID=15489683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15010980A Granted JPS5774343A (en) | 1980-10-28 | 1980-10-28 | Resin composition for preparing paper-like film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5774343A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59157136A (en) * | 1983-02-28 | 1984-09-06 | Idemitsu Petrochem Co Ltd | Polyolefin resin sheet |
| JPH02138348A (en) * | 1988-11-18 | 1990-05-28 | Okamoto Ind Inc | Resin composition |
| ATE117340T1 (en) * | 1989-11-16 | 1995-02-15 | Mitsui Petrochemical Ind | RESIN MIXTURE FOR FILMS AND METHOD FOR PRODUCING FILMS USING THE RESIN MIXTURE. |
| EP3390525B1 (en) * | 2016-08-31 | 2019-07-03 | Total Research & Technology Feluy | Polyolefin blends comprising single-site catalyst produced isotactic polypropylene and polyethylene, process and articles made from these blends |
-
1980
- 1980-10-28 JP JP15010980A patent/JPS5774343A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5774343A (en) | 1982-05-10 |
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