KR19990053060A - Resin composition for easy peel film and easy peel film using same - Google Patents
Resin composition for easy peel film and easy peel film using same Download PDFInfo
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- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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Abstract
본 발명은 특정 용융지수를 갖는 선형저밀도 폴리에틸렌, 저밀도 폴리에틸렌, 폴리스티렌수지 및 폴리프로필렌이 적정비율로 구성된 이지필 필름용 수지조성물 및 이를 이용한 이지필 필름에 관한 것이다.The present invention relates to a resin composition for an easy-fill film comprising a linear low density polyethylene, a low density polyethylene, a polystyrene resin and a polypropylene in an appropriate ratio having a specific melt index, and an easy-fill film using the same.
본 발명에 따른 이지필 필름은 투명성과 접착특성이 우수하며, 특히 폴리프로필렌용기에 적합하다.The easy-fill film according to the present invention has excellent transparency and adhesive properties, and is particularly suitable for polypropylene containers.
Description
본 발명은 폴리프로필렌 용기에 대해 이지필(easy peel) 특성을 가지는 캐스트필름용 수지 조성물 및 이를 이용하여 제조되는 이지필 필름에 관한 것으로, 보다 상세하게는 선형저밀도 폴리에틸렌, 저밀도 폴리에틸렌, 폴리프로필렌 및 폴리스티렌으로 구성되어 필름 성형시 필름의 투명성이 우수하고 접착특성이 우수하며, 특히 폴리프로필렌 용기에 적합한 이지필 필름용 수지 조성물 및 이를 이용한 이지필 필름에 관한 것이다.The present invention relates to a resin composition for cast film having an easy peel property for a polypropylene container, and to an easy peel film prepared by using the same, and more particularly, to linear low density polyethylene, low density polyethylene, polypropylene and polystyrene. The present invention relates to a resin composition for easy-fill film suitable for a polypropylene container, and an easy-fill film using the same, which is excellent in transparency and excellent adhesive properties in film forming.
90년대 초반까지의 식품포장에 대한 개념은 식품의 장기 보존성에 대한 것이 매우 중요하게 강조되었으나, 최근들어 산업구조의 고도화에 따라 인스턴트 산업의 발달, 의약 산업의 발달, 디저트 산업의 발달과 더불어 포장 개념이 단위포장, 개봉 용이성 등의 측면이 특히 강조되는 추세로서, 그 일환으로 등장한 것이 개봉이 용이한 이지필 필름이다.The concept of food packaging until the early 90s was very important for the long-term preservation of food, but recently, with the advancement of the industrial structure, the concept of packaging with the development of instant industry, the development of medicine industry, and the dessert industry This aspect of unit packing, ease of opening, and the like are particularly emphasized, and it is easy-opening film that has emerged as part of the trend.
이지필 필름은 상용성이 서로 다른 폴리머들로 구성되어, 접착기재에 열융착시 기재와 필름간의 상용성, 비상용 특성의 적절한 분포에 의해 적당한 접착력을 가지면서 이지필 특성을 발현시키는 것으로서 가장 핵심적인 기술은 상용성이 서로 다른 폴리머들의 선정 및 이들간의 브렌드 비율, 연속상과 분산성의 모폴러지 제어 기술이다. 특히, 용도가 식품포장용 필름일 경우 포장내의 음식물이 보여야 함으로 필름의 투명성 확보가 매우 중요하다.The easy peel film is composed of polymers with different compatibility, and the core technology is to express the easy peel property with proper adhesion by proper distribution of compatibility and incompatibility between the substrate and the film when heat-sealing the adhesive base. It is the morphology control technology of the selection of polymers with different compatibility and blend ratio between them, continuous phase and dispersibility. In particular, when the use is a film for food packaging, it is very important to ensure the transparency of the film because the food in the package should be visible.
종래의 기술을 살펴보면, 일본국 특허 공개 소63-28639호에 의하면 폴리부텐/폴리에틸렌/폴리프로필렌으로 이지필 필름을 구성하여 폴리프로필렌 용기용에 적용하였는데, 이 경우 투명성확보 및 저온접착측면에서 우수한 특성을 나타내었다. 그러나 폴리부텐의 단가가 매우 고가인 점 때문에 경제적 측면에서 상대적으로 저가인 제품 사용을 통한 이지필 필름 개발이 적극적으로 진행되었다. 일본국 특허 공개 평6-287417호에서는 폴리부텐에 비해 경제적으로 매우 저렴한 폴리스티렌을 사용하여 이지필 필름을 제조하였다. 이렇게 제조된 필름을 폴리프로필렌 용기에 적용시 폴리스티렌이 폴리프로필렌에 대해 상용성이 전혀 없기 때문에 포장재가 이지필 특성을 발현하게 된다. 반면 접착력 측면에서 폴리프로필렌과 브렌딩하여 사용해야 하며, 이 경우 폴리스티렌과 폴리프로필렌의 용해도 파라미터 차이가 매우 커(폴리프로필렌 : 7.83, 폴리스티렌 : 9.00) 가공성 안정화 측면에서 폴리에틸렌수지(용해도 파라미터 8.5 수준)를 포함하여야 한다. 폴리스티렌을 사용하여 이지필 필름을 제조할 경우 이지필 특성은 매우 우수한 반면, 가공성 측면 및 필름의 투명성 문제가 발생할 수 있어 식품 포장용 포장재로 적용하기가 매우 어렵다. 이지필 필름의 투명성 저하 원인은 도 1에서와 같이 모폴러지를 관찰하면 연속상으로 작용하는 폴리에틸렌 위에 분산상으로 작용하는 폴리스티렌이 구슬을 얻어 놓은 모양으로 분포되어 있어 광산란을 증대시키기 때문이다.Looking at the prior art, Japanese Patent Laid-Open No. 63-28639 has been made of polybutene / polyethylene / polypropylene for an easy-fill film and applied to a polypropylene container, in which case excellent properties in terms of securing transparency and low temperature adhesion Indicated. However, since polybutene's unit price is very high, the development of easy peel film through active use of relatively inexpensive product in terms of economics has been actively carried out. In Japanese Patent Laid-Open No. 6-287417, an easy-fill film was manufactured using polystyrene which is very economically cheap compared to polybutene. When the film thus prepared is applied to a polypropylene container, the packaging material exhibits easy-filling properties because the polystyrene has no compatibility with the polypropylene. On the other hand, in terms of adhesive strength, it should be blended with polypropylene, and in this case, the difference in solubility parameter between polystyrene and polypropylene is very large (polypropylene: 7.83, polystyrene: 9.00). shall. When the easy-fill film is manufactured using polystyrene, the easy-fill property is very excellent, but the processability and transparency of the film may occur, so it is very difficult to apply the packaging material for food packaging. The reason for the decrease in transparency of the easy peel film is that when morphology is observed as shown in FIG. 1, polystyrene acting as a dispersed phase is distributed in the shape of beads obtained on the polyethylene acting as a continuous phase, thereby increasing light scattering.
본 발명의 목적은 폴리스티렌을 이용한 이지필 필름 수지 조성물에 있어서 접착특성과 이지필 특성이 조화를 이루게하면서, 동시에 분산상으로 작용하는 폴리스티렌의 입자크기를 최소화하며 분산을 균일하게 시켜 빛의 난반사를 최소화시킴으로써 필름의 투명성을 획기적으로 증대시킨 폴리프로필렌 용기용 이지필 필름 수지조성물 및 이를 이용한 이지필 필름을 제공하는 것이다.It is an object of the present invention to minimize the particle size of polystyrene acting as a disperse phase and to uniformly disperse the light to minimize the diffuse reflection of light in the easy-fill film resin composition using polystyrene, while at the same time balancing the adhesive properties and easy-fill properties It is to provide an easy-fill film resin composition for a polypropylene container that significantly increases transparency and an easy-fill film using the same.
본 발명의 폴리프로필렌 용기용 이지필 필름 수지조성물은 용융지수가 2∼4(190℃, 2.16kg)인 선형저밀도 폴리에틸렌을 전체 수지 조성물에 대하여 40∼80중량%로 사용하며, 용융지수가 4∼7(230℃, 2.16kg)인 폴리스티렌이 5∼15중량%, 용융지수가 2∼4(190℃, 2.16kg)인 저밀도 폴리에틸렌 5∼15중량%, 용융지수가 4∼7(230℃, 2.16kg)인 폴리프로필렌 10∼30중량%로 구성되며, 본 발명의 이지필 필름은 상기 수지조성물을 이용하여 용융 브렌딩 및 캐스트 필름 제조시 가공온도를 240∼260℃로 유지시킴으로써 필름의 투명성을 최적화시키는 방법에 의해 제조되는 것을 특징으로 한다.The easy-fill film resin composition for a polypropylene container of the present invention uses linear low-density polyethylene having a melt index of 2 to 4 (190 ° C, 2.16 kg) at 40 to 80 wt% based on the total resin composition, and has a melt index of 4 to 7 5-15% by weight of polystyrene (230 ° C, 2.16kg), 5-15% by weight of low density polyethylene having a melt index of 2-4 (190 ° C, 2.16kg), 4-7% of melt index (230 ° C, 2.16kg) ) Is composed of 10 to 30% by weight of polypropylene, the method for optimizing the transparency of the easy-fill film of the present invention by maintaining the processing temperature at 240 to 260 ℃ during melt blending and cast film production using the resin composition It is characterized by being manufactured by.
본 발명의 수지 조성물에서 선형저밀도폴리에틸렌(LLDPE) 사용량은 40∼80중량%이며, 65∼70중량%일 때 가장 적합하다. 선형저밀도폴리에틸렌의 사용량이 40중량% 미만일때에는 저밀도 폴리에틸렌, 폴리프로필렌 및 폴리스티렌 수지의 함량이 증가하여 모폴러지상에서 상전이가 일어날 가능성이 있으며, 이로인해 비상용 수지들의 분포 불균일에 따른 필름의 열접착성 저하 및 접착부위 불균일도가 증가될 염려가 있다. 또한 사용량이 80중량%를 초과할 때에는 수지압 및 부하상승으로 인한 가공성 저하가 예상된다.The linear low density polyethylene (LLDPE) is used in the resin composition of the present invention is 40 to 80% by weight, most suitable when 65 to 70% by weight. When the amount of linear low density polyethylene is less than 40% by weight, the content of low density polyethylene, polypropylene, and polystyrene resin may increase, resulting in phase transition on morphology, resulting in a decrease in thermal adhesiveness of the film due to uneven distribution of incompatible resins. There is a fear that the adhesion nonuniformity is increased. In addition, when the amount of use exceeds 80% by weight, workability deterioration due to resin pressure and load increase is expected.
저밀도 폴리에틸렌(LDPE)은 장쇄분지를 많이 함유하고 있어 압출가공성 영역을 넓혀 줄 수 있으며, 특히 상용성이 전혀 없는 폴리프로필렌, 폴리스티렌의 가교역할을 해 압출시 서징현상 방지 및 압출흐름성을 안정하게 유지시켜 준다. 저밀도폴리에틸렌의 사용량이 5중량% 미만일 때에는 가공성 개선의 역할을 기대할 수 없으며, 사용량이 15중량%를 초과할 때에는 저밀도 폴리에틸렌이 폴리프로필렌 용기에 대해 열접착성이 없기 때문에 접착강도 저하의 원인이 된다.Low-density polyethylene (LDPE) contains a lot of long chain branches, which can widen the extrudability area. Especially, it prevents surging during extrusion and maintains extrusion flow stability by exchanging the role of crosslinking of polypropylene and polystyrene which are not compatible at all. Let it be. If the amount of the low density polyethylene is less than 5% by weight can not be expected to improve the processability, when the amount of use of the low density polyethylene exceeds 15% by weight because the low density polyethylene is not heat-adhesive to the polypropylene container, it causes a decrease in adhesive strength.
본 발명에서 폴리프로필렌(PP)은 10∼30중량%를 사용하는데 사용량이 30중량%를 초과할 때에는 폴리프로필렌용기에 대해 접착력이 너무 강해 이지필 특성 발현이 어렵고, 개봉시 포장재가 찢어질 염려가 있으며, 사용량이 10중량% 미만일 때에는 접착강도 저하로, 포장시 고온 살균공정이나 완제품의 이동과정에서 외부충격에 의해 쉽게 파손될 가능성이 있다. 폴리스티렌(PS)의 경우 5∼15중량%를 사용하며, 사용량이 15중량%를 초과할 경우 폴리프로필렌용기에 대해 접착강도 저하 및 투명성 확보가 어렵고, 사용량이 5중량% 미만일 때에는 이지필 특성 발현이 어렵다.In the present invention, polypropylene (PP) uses 10 to 30% by weight, when the amount of use exceeds 30% by weight, the adhesive force is too strong for the polypropylene container, it is difficult to express the easy-fill characteristics, there is a fear that the packaging material is torn when opened. When the amount is less than 10% by weight, the adhesive strength may be reduced, and may be easily damaged by external impact during the high temperature sterilization process or the movement of the finished product during packaging. In the case of polystyrene (PS), 5 to 15% by weight is used, and when the amount of use exceeds 15% by weight, it is difficult to reduce the adhesive strength and to secure transparency to the polypropylene container, and when the amount is less than 5% by weight, it is difficult to express easy peeling characteristics. .
본 발명의 이지필 필름은 상기한 조성의 수지조성물을 용융브렌딩 및 필름 제조시 가공온도를 240∼270℃로 유지하는 것이 바람직하며, 특히 250℃ 가공이 가장 적합하다. 가공온도가 240℃ 이하이거나 270℃ 이상일 때, 도 2에서 보는 바와 같이 선형저밀도폴리에틸렌의 점도비 대비 폴리스티렌, 폴리프로필렌, 저밀도폴리에틸렌의 점도비가 각각 1에서 더 멀리 벗어나기 때문에 폴리스티렌을 포함한 분산상 수지의 입자 크기가 증가되어 필름 성형시 투명성 저하가 예상된다.In the easy-fill film of the present invention, it is preferable to maintain a processing temperature of 240 to 270 ° C during melt blending and film production of the resin composition having the above-mentioned composition, and particularly, 250 ° C processing is most suitable. When the processing temperature is less than 240 ℃ or more than 270 ℃, as shown in Figure 2, the viscosity ratio of the polystyrene, polypropylene, low-density polyethylene compared to the viscosity ratio of linear low-density polyethylene deviates farther from 1, respectively, the particle size of the dispersed phase resin including polystyrene Is increased to decrease transparency in film forming.
본 발명은 이하 실시예와 비교예를 통해 좀더 구체적으로 이해될 수 있으며, 이하 실시예와 비교예들은 본 발명의 범위를 한정하고자 하는 것이 아니라 예시적인 목적으로 기재하는 것이다.The present invention can be understood in more detail through the following examples and comparative examples, the following examples and comparative examples are not intended to limit the scope of the present invention but are described for illustrative purposes.
이하 본 발명을 실시예에 의거하여 설명한다. 실시예 및 비교예에 따른 필름의 특성에 대해 필링강도, 필링시간, 흐림도, 보일링시험 및 압출가공성을 다음과 같이 평가하였다.Hereinafter, the present invention will be described based on Examples. The peeling strength, peeling time, cloudiness, boiling test and extrusion processability were evaluated for the properties of the films according to Examples and Comparative Examples as follows.
1. 흐림도 : ASTM D 1003에 의거하여 흐림도를 측정하였다.1. Cloudiness: The cloudiness was measured according to ASTM D 1003.
2. 필링강도 및 필링시간 :2. Peeling strength and peeling time:
필링강도는 15mm × 10mm 크기로 폴리프로필렌 시트에 융착시킨 필름을 UTM에서 세로방향으로 필링시킬 때 측정되는 강도의 최고값을 선정하였다.The peeling strength was selected as the maximum value of the strength measured when the film fused to the polypropylene sheet in the size of 15 mm x 10 mm in the longitudinal direction in the UTM.
이때, 접착기재인 폴리프로필렌 시트는 아래 그립에 물리고, 필링되는 필름은 윗쪽 그립에 물린 후 200mm/min의 속도로 필링시켰다.At this time, the polypropylene sheet as an adhesive base was bitten on the lower grip, and the peeled film was bitten on the upper grip and then peeled at a speed of 200 mm / min.
또한 필링시간은 폴리프로필렌 시트에 접착된 필름이 시트로부터 분리될때부터 완전히 분리될때까지의 시간으로, 접착강도가 너무 약하면 필링시간이 짧아지거나 보일링시험시 완전히 벗겨지거나 부분필이 발생되며, 필링강도가 너무 강할 경우에는 필링되는 필름이 연신되거나 찢어지는(파단) 현상이 발생됨으로 적정수준의 필링강도를 유지시켜 주어야 한다. 통상적으로 어묵용, 햄포장용, 젤리포장용 등의 포장시 요구되는 필링강도 및 필링시간은 각각 1.2∼1.8Kg/15mm, 20∼25초 정도 이다.In addition, the peeling time is the time from when the film bonded to the polypropylene sheet is separated from the sheet to the complete separation. If the adhesive strength is too weak, the peeling time is shortened, or peeling completely or partial peeling occurs during the boiling test. If is too strong, the peeling film is stretched or torn (breaking) occurs to maintain an appropriate level of peeling strength. In general, the peeling strength and peeling time required for packaging such as fish paste, ham packaging, and jelly packaging are about 1.2 to 1.8 Kg / 15 mm and 20 to 25 seconds, respectively.
3. 보일링 시험3. Boiling test
이지필 필름을 PET와 나일론으로 합지(이지필/PET/나일론)시켜 레토르토 파우치용 봉지를 만든 후, 각각의 봉지에 물을 10g씩 주입하고 열융착시켜 밀봉하였다. 이렇게 제조된 각각의 봉지를 90℃로 유지된 드라이 오븐에서 120분간 방치한 후 접착부위가 필링되는지에 대한 평가를 실시하였다. 이때 평가는 육안으로 하였다.The easy-fill film was laminated with PET and nylon (Easy-Peel / PET / Nylon) to make a bag for a retorto pouch, and then 10 g of water was injected into each bag and sealed by heat fusion. Each bag thus prepared was left to stand in a dry oven maintained at 90 ° C. for 120 minutes, and then evaluated for adhesive bonding. At this time, evaluation was made with the naked eye.
4. 압출가공성4. Extrudeability
압출가공성은 캐스팅용 필름성형기에서 필름 제조시 압출기내 서징 발생 유무 및 발생되는 부하의 크기로 평가하였다. 압출기내 수지의 흐름이 균일하지 못하고 서징이 발생될 경우 단위시간당 압출되는 수지의 양에 차이가 있어 성형되는 필름의 두께가 불균일하게 되어 필름 제조가 매우 어려우며, 부하가 많이 걸릴 경우에는 필름 성형을 저속으로 하여야 함으로 경제적 측면에서 손실이 크게 된다.Extrusion processability was evaluated by the presence of surging in the extruder and the magnitude of the load generated during the film production in the casting film forming machine. If the flow of resin in the extruder is not uniform and surging occurs, there is a difference in the amount of resin extruded per unit time, resulting in uneven thickness of the film to be formed, making the film very difficult. The loss in terms of economics is great.
(실시예 1∼9, 비교예 1∼8)(Examples 1-9, Comparative Examples 1-8)
표 1의 수지조성물을 30ψ 이축스크루 압출기에서 표 1의 압출온도(용융수지의 온도)로 용융브렌딩하여 펠렛화한 후 이것을 캐스팅용 필름기에서 30㎛의 두께로 필름을 성형하였다. 성형된 필름은 각각 두께가 16㎛인 PET와 나일론으로 합지시킨 후, 보일링시험과 필름의 흐림도를 측정하였으며, 또한 필름을 일정크기로 잘라 폴리프로필렌에 열융착시킨 후 필링강도와 필링시간을 측정하였다. 각각에 대한 시험 결과는 표 1에 나타내었다.The resin composition of Table 1 was melt-blended and pelletized in a 30ψ twin screw extruder at the extrusion temperature (melt resin temperature) of Table 1, and then molded into a film having a thickness of 30 μm in a casting film machine. The molded film was laminated with PET and nylon having a thickness of 16 μm, respectively, and the boiling test and the cloudiness of the film were measured. Also, the film was cut into a predetermined size and thermally fused to polypropylene, and then peeling strength and peeling time were measured. Measured. The test results for each are shown in Table 1.
(열융착 방법)(Thermal Fusion Method)
1. 필름의 크기 : 5㎝ × 30㎝1.Size of film: 5cm × 30cm
2. 접착기재 : 사용한 폴리프로필렌시트는 230℃, 2.16kg에서 용융지수가 0.5인 블록코폴리머를 사용하였으며, 두께는 0.5t, 크기는 5㎝×30㎝ 이다.2. Adhesive Substrate: The polypropylene sheet used was a block copolymer having a melt index of 0.5 at 230 ° C. and 2.16 kg, 0.5t thick and 5cm × 30cm in size.
3. 열융착 온도 : 180℃∼220℃ 범위에서 온도는 10℃간격으로 하였다.3. Heat Fusion Temperature: The temperature was set at 10 ° C interval in the range of 180 ° C to 220 ° C.
4. 열융착 면적 : 15㎜ × 10㎜4. Heat Fusion Area: 15㎜ × 10㎜
5. 열융착 시간 : 1초5. Heat Fusion Time: 1 second
6. 열융착 압력 : 2Bar6. Heat Fusion Pressure: 2Bar
본 발명에 의하면 접착특성 및 이지필 특성이 우수하며, 동시에 투명성도 우수한 이지필 필름이 제공된다.According to the present invention, there is provided an easy-fill film which is excellent in adhesive properties and easy-fill properties, and also excellent in transparency.
Claims (4)
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| KR1019970072630A KR100450386B1 (en) | 1997-12-23 | 1997-12-23 | Resin composition for easy peel film with desirable melting index and easy peel film using the same |
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| KR1019970072630A KR100450386B1 (en) | 1997-12-23 | 1997-12-23 | Resin composition for easy peel film with desirable melting index and easy peel film using the same |
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| US4666778A (en) * | 1984-08-31 | 1987-05-19 | Shell Oil Company | Packaging film and sheet capable of forming peelable seals with good optics |
| CA1270975A (en) * | 1985-12-30 | 1990-06-26 | Surinder K. Bahl | Blends of linear low density polyethylene, polypropylene and aromatic polymers and high modulus films thereof |
| EP0359847B1 (en) * | 1987-03-23 | 1993-12-15 | Sumitomo Bakelite Company Limited | Container |
| US5375698A (en) * | 1993-05-07 | 1994-12-27 | Allergan, Inc. | Prefilled, resealable contact lens container |
| JPH0873615A (en) * | 1994-09-09 | 1996-03-19 | Dainippon Printing Co Ltd | Heat sealant layer |
| US5651462A (en) * | 1995-08-23 | 1997-07-29 | Reynolds Consumer Products Inc. | Rigid reclosable packaging |
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