JP2601509C - - Google Patents
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- Publication number
- JP2601509C JP2601509C JP2601509C JP 2601509 C JP2601509 C JP 2601509C JP 2601509 C JP2601509 C JP 2601509C
- Authority
- JP
- Japan
- Prior art keywords
- film
- average molecular
- molecular weight
- density
- antifogging
- 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
- -1 fatty acid esters Chemical class 0.000 claims description 15
- 239000004698 Polyethylene (PE) Substances 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 239000011342 resin composition Substances 0.000 claims description 8
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 7
- 239000000194 fatty acid Substances 0.000 claims description 7
- 235000012055 fruits and vegetables Nutrition 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 claims 1
- 239000004700 high-density polyethylene Substances 0.000 claims 1
- 229920001684 low density polyethylene Polymers 0.000 description 15
- 239000004702 low-density polyethylene Substances 0.000 description 15
- 239000003795 chemical substances by application Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 2
- 230000000903 blocking Effects 0.000 description 2
- 230000001771 impaired Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 206010018987 Haemorrhage Diseases 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N Oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 230000000740 bleeding Effects 0.000 description 1
- 231100000319 bleeding Toxicity 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 230000001953 sensory Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、防曇性能に優れるとともに、フィルムの開口性、透明性に優れた防
曇性フィルム用ポリエチレン樹脂組成物に関する。Description: TECHNICAL FIELD [Industrial application field] The present invention relates to a polyethylene resin composition for an antifogging film, which is excellent in antifogging performance and also excellent in film openness and transparency.
ポリエチレンフィルムは、青果物等の包装に使用された場合、低温貯蔵中、或
いは輸送中に青果物から発生する水蒸気が凝縮し、包装物の内面に曇り現象を生
じ青果物の外観的商品イメージを著しく損う欠点がある。これらの問題を改良す
るため、ポリエチレン樹脂に種々の防曇剤を添加し防曇性を付与することが知ら
れている。（特開昭５４−５５０４４号公報）
しかしながら、防曇剤を添加することにより防曇性は付与されるものの、フィ
ルム表面にブリードした防曇剤がフイルムの開口性を著しく低下させるために防
曇剤の添加量を多くして高度な防曇性能を得ることが出来ないという欠点があっ
た。When polyethylene film is used for packaging fruits and vegetables, water vapor generated from fruits and vegetables condenses during low-temperature storage or transportation, causing a clouding phenomenon on the inner surface of the package and significantly impairing the appearance of the fruits and vegetables. There are drawbacks. In order to improve these problems, it is known that various antifogging agents are added to the polyethylene resin to impart antifogging properties. (Japanese Patent Laid-Open No. 54-55044) However, although the antifogging property is imparted by adding the antifogging agent, the antifogging agent bleeding on the film surface significantly reduces the openness of the film, so that the antifogging property is significantly reduced. There is a drawback that it is not possible to obtain a high degree of antifogging performance by increasing the amount of the agent added.
このような問題点を解決する方法として、フィルムの表面を粗面にすることに
より開口性を保持することが行なわれている。しかしながらフィルムの表面を粗
面にすることにより開口性は保持されるものの防曇性フィルムの透明性をそこな
うことになり、商品としての価値が低下する。As a method for solving such a problem, the openness is maintained by roughening the surface of the film. However, by making the surface of the film rough, the openness is maintained, but the transparency of the antifogging film is impaired, and the value as a commercial product is reduced.
以上のことから本発明はこれらの問題点、すなわち防曇性能に優れるとともに
フィルムの開口性、透明性に優れた防曇性フィルム用ポリエチレン樹脂組成物を
提供することにある。From the above, it is an object of the present invention to provide a polyethylene resin composition for an antifogging film, which is excellent in antifogging performance and also excellent in openness and transparency of the film.
本発明は、密度が０.９２７〜０.９３５ｇ／ｃｍ3で、重量平均分子量と数平
均分子量の比であるＭｗ／Ｍｎが７以下の高圧法低密度ポリエチレンと多価アル
コールの脂肪酸エステル類と高級脂肪酸のアマイド類とからなる防曇性開口性透
明性に優れた青果物包装フィルム用ポリエチレン樹脂組成物に係わる。In the present invention, high-pressure low-density polyethylene having a density of 0.927 to 0.935 g / cm 3 and a Mw / Mn ratio of 7 or less, which is the ratio of the weight average molecular weight to the number average molecular weight, and polyvalent al-polyethylene.
Anti-fog open permeability consisting of fatty acid esters of Cole and amides of higher fatty acids
It relates to a polyethylene resin composition for a fruit and vegetable packaging film having excellent clarity .
本発明において用いる高圧法低密度ポリエチレンは、密度が０.９２７〜０.９
３５ｇ／ｃｍ3で、重量平均分子量と数平均分子量の比であるＭｗ／Ｍｎが７以
下、好ましくは、３〜５の高圧法低密度ポリエチレンである。The high-pressure low-density polyethylene used in the present invention has a density of 0.927 to 0.9.
At 35 g / cm 3 , Mw / Mn, which is the ratio of the weight average molecular weight to the number average molecular weight, is 7 or less, preferably 3 to 5 high-pressure low-density polyethylene.
高圧法低密度ポリエチレンの密度が０.９２７ｇ／ｃｍ3より小さいとフィルム
の開口性が低下し、０.９３５ｇ／ｃｍ3をこえるとフィルムの透明性が損なわれ
る。The density of the high-pressure low density polyethylene decreases the opening of 0.927 g / cm 3 less than the film, the transparency of the film is impaired exceeds 0.935 g / cm 3.
また、高圧法低密度ポリエチレンの重量平均量と数平均分子量の比であるＭｗ
／Ｍｎが７をこえると、フィルムの透明性が低下する。Ｍｗ／Ｍｎが３より小さ
い高圧法低密度ポリエチレンも使用できるが、実用的にはコストアップとなる。In addition, Mw, which is the ratio of the weight average amount and the number average molecular weight of the high-pressure method low-density polyethylene.
When / Mn exceeds 7, the transparency of the film decreases. High-pressure low-density polyethylene with Mw / Mn smaller than 3 can also be used, but the cost is practically increased.
本発明においては、防曇剤として多価アルコールの脂肪酸エステル類と、高級
脂肪酸のアマイド類とを２種以上混合するとよい。In the present invention, a polyhydric alcohol fatty acid esters as anti-fogging agent, mixed result may more and amides of higher fatty acids.
前記高圧法低密度ポリエチレンに対する防曇剤の添加量はその種類によっても
異るが、本発明の目的を達成し得る限り、任意の範囲に設定し得る。通常その量
は、０.０１〜５ｗｔ％が適当である。The amount of the antifogging agent added to the high-pressure low-density polyethylene varies depending on the type thereof, but can be set in any range as long as the object of the present invention can be achieved. Usually, the amount is 0.01 to 5 wt%.
本発明の樹脂組成物を製造するにあたり、一般にポリエチレン樹脂の分野にお
いて実施されている混合方法によって前記高圧法低密度ポリエチレンと防曇剤を
均一に混合させる。混合方法としては、ロールミル、コニーダー、バンバリーミ
キサー、混練押出機等を用いて溶融混合する方法、あるいは、防曇剤を高濃度に
含有するマスターバッチを調製し、これをフィルム成形時に前記高圧法低密度ポ
リエチレンと混合する方法があげられる。In producing the resin composition of the present invention, the high-pressure method low-density polyethylene and the antifogging agent are uniformly mixed by a mixing method generally practiced in the field of polyethylene resin. As a mixing method, a method of melt-mixing using a roll mill, a conider, a Banbury mixer, a kneading extruder, etc., or a master batch containing a high concentration of an antifogging agent is prepared, and this is subjected to the high-pressure method at the time of film molding. A method of mixing with density polyethylene can be mentioned.
このようにして得られる本発明のポリエチレン樹脂組成物は、ポリエチレン樹
脂の分野において一般に行われているインフレーション法あるいはＴダイ法によ
ってフィルムに成形され各種包装用フィルム等に使用される。The polyethylene resin composition of the present invention thus obtained is formed into a film by an inflation method or a T-die method generally used in the field of polyethylene resin, and is used for various packaging films and the like.
以下、本発明を実施例で詳細に説明する。なお試験方法は以下の通りである。 Hereinafter, the present invention will be described in detail with reference to Examples. The test method is as follows.
(1) 密度 ＡＳＴＭＤ−１５０５に準拠し測定した。(1) Density Measured according to ASTMD-1505.
(2) Ｍｗ／Ｍｎ
ＨＬＣ−８１１型ＧＰＣ（東洋ソーダ製）により、重量平均分子量と数平均分
子量を求め、その比をＭｗ／Ｍｎとした。(2) Mw / Mn HLC-811 type GPC (manufactured by Toyo Soda) was used to determine the weight average molecular weight and the number average molecular weight, and the ratio was defined as Mw / Mn.
(3) 防曇性
２００ｃｃの上部開口容器に５０℃の温水を１５０ｃｃ入れ、フィルムで容器
開口部を密閉し、５０℃の恒温水槽に入れ、フィルム内面に付着する水滴を観察
した。(3) Anti-fog property 150 cc of hot water at 50 ° C was put in a 200 cc upper opening container, the opening of the container was sealed with a film, and the container was placed in a constant temperature water tank at 50 ° C, and water droplets adhering to the inner surface of the film were observed.
○：全面が均一に濡れ、フィルムが透明である。 ◯: The entire surface is uniformly wet and the film is transparent.
△：径２〜３ｍｍの水滴が全面に付着し、フィルムがやや不透明
×：全面に微小水滴が付着し、フィルムが不透明
(4) 開口性
フィルムに５００Ｋｇ／ｍ2の荷重をかけ、５０℃で２４時間静置、更に荷重
を加えたまま２３℃で２４時間静置後、フィルムの開口性を官能テストにより判
定した。△: adhered water droplet diameter 2~3mm is on the entire surface, the film is somewhat opaque ×: entire surface adhered water drops, a load of 500 Kg / m 2 film is opaque (4) opening film, at 50 ° C. After standing for 24 hours and further standing at 23 ° C. for 24 hours with a load applied, the openness of the film was judged by a sensory test.
○：ブロッキングしない。 ◯: Do not block.
△：僅かにブロッキングする。 Δ: Slightly blocking.
×：完全にブロッキングする。 X: Completely blocking.
(5) ヘイズ ＡＳＴＭＤ−１００３に準拠し測定した。(5) Hayes Measured according to ASTMD-1003.
実施例１
密度が０.９２７ｇ／ｃｍ3、重量平均分子量と数平均分子量の比であるＭｗ／
Ｍｎが４の高圧法低密度ポリエチレンに、防曇剤としてグリセリン脂肪酸エステ
ルを０.４ｗｔ％、滑剤としてオレイン酸アミドを０.１ｗｔ％、アンチブロッキ
ング剤としてシリカを０.１ｗｔ％添加したものを、インフレーション成形機に
依ってフィルム厚み３０μのフィルムとした。Example 1 Density is 0.927 g / cm 3 , which is the ratio of weight average molecular weight to number average molecular weight Mw /
High-pressure low-density polyethylene with Mn of 4, glycerin fatty acid ester 0.4 wt% as antifogging agent, oleic acid amide 0.1 wt% as lubricant, and silica 0.1 wt% as antiblocking agent added. A film having a film thickness of 30 μm was prepared by an inflation molding machine.
得られたフィルムの評価結果を表−１に示す。 The evaluation results of the obtained film are shown in Table-1.
実施例２
高圧法低密度ポリエチレンを、密度が０.９３０ｇ／ｃｍ3、重量平均分量と数
平均分子量の比であるＭｗ／Ｍｎが５である高圧法低密度ポリエチレンとする他
は、実施例１と同様にして表−１の結果を得た。Example 2 Example 1 except that the high-pressure method low-density polyethylene is a high-pressure method low-density polyethylene having a density of 0.930 g / cm 3 and Mw / Mn of 5, which is the ratio of the weight average amount to the number average molecular weight. The results shown in Table 1 were obtained in the same manner as in Table 1.
比較例１
高圧法低密度ポリエチレンを、密度が０.９２３ｇ／ｃｍ3、重量平均分量と数
平均分子量の比であるＭｗ／Ｍｎが５である高圧法低密度ポリエチレンとする他
は、実施例１と同様にして表−１の結果を得た。Comparative Example 1 Example 1 except that the high-pressure method low-density polyethylene is a high-pressure method low-density polyethylene having a density of 0.923 g / cm 3 and Mw / Mn of 5, which is the ratio of the weight average amount to the number average molecular weight. The results shown in Table 1 were obtained in the same manner as in Table 1.
比較例２
高圧法低密度ポリエチレンを、密度が０.９１８ｇ／ｃｍ3、重量平均分量と数
平均分子量の比であるＭｗ／Ｍｎが１２である高圧法低密度ポリエチレンとする
他は、実施例１と同様にして表−１の結果を得た。Comparative Example 2 Example 1 except that the high-pressure method low-density polyethylene is a high-pressure method low-density polyethylene having a density of 0.918 g / cm 3 and a Mw / Mn ratio of the weight average amount to the number average molecular weight of 12. The results shown in Table 1 were obtained in the same manner as in Table 1.
表−１の結果から明らかなように、本発明の樹脂組成物は開口性、透明性の優
れたフィルムを得ることができる。 As is clear from the results in Table 1, the resin composition of the present invention can obtain a film having excellent openness and transparency.
比較例１のごとく、密度が０.９２７ｇ／ｃｍ3より小さい場合は、開口性に問
題があった、また比較例２のごとく重量平均分子量と数平均量の比であるＭｗ／
Ｍｎが７より大きい場合は、開口性は良いものの、光学特性が著しく劣る欠点が
あった。When the density is smaller than 0.927 g / cm 3 as in Comparative Example 1, there is a problem in openness, and as in Comparative Example 2, the ratio of the weight average molecular weight to the number average amount is Mw /.
When Mn is larger than 7, the openness is good, but there is a drawback that the optical characteristics are remarkably inferior.
本発明の防曇性フィルム用ポリエチレン樹脂組成物は、開口性、透明性の優れ
た防曇性フィルムを得ることができる。したがって青果物等の包装材として好適
である。The polyethylene resin composition for an antifogging film of the present invention can obtain an antifogging film having excellent openness and transparency. Therefore, it is suitable as a packaging material for fruits and vegetables.
Claims (1)
比であるＭｗ／Ｍｎが７以下の高圧法低密度ポリエチレンと多価アルコールの脂
肪酸エステル類と高級脂肪酸のアマイド類とからなる防曇性開口性透明性に優れ
た青果物包装フィルム用ポリエチレン樹脂組成物。 High-density polyethylene and polyhydric alcohol fat with a density of 0.927 to 0.935 g / cm 3 and a Mw / Mn ratio of 7 or less, which is the ratio of the weight average molecular weight to the number average molecular weight.
Excellent anti-fog and open transparency consisting of fatty acid esters and higher fatty acid amides
Polyethylene resin composition for fruit and vegetable packaging film.
Family
ID=
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