KR100563479B1 - A Resin Composition For Easy-Fill Film - Google Patents
A Resin Composition For Easy-Fill Film Download PDFInfo
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- KR100563479B1 KR100563479B1 KR1019990060977A KR19990060977A KR100563479B1 KR 100563479 B1 KR100563479 B1 KR 100563479B1 KR 1019990060977 A KR1019990060977 A KR 1019990060977A KR 19990060977 A KR19990060977 A KR 19990060977A KR 100563479 B1 KR100563479 B1 KR 100563479B1
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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Abstract
본 발명은 폴리프로필렌 용기 뿐만 아니라 폴리스티렌 용기에 대해서도 이지필 특성을 가지는 수지 조성물에 관한 것으로써 좀더 상세하게는 비닐아세테이트의 함량이 전체 EVA 수지 대비 22~46중량%인 EVA를 전체 수지조성물에 대해 30~80중량%를 사용하며, LDPE를 전체 수지조성물에 대해 10~40중량%, 코모노머가 C8인 에틸렌 알파올레핀수지가 전체수지조성물에 대해 10~30중량%로 구성된 폴리프로필렌 용기 및 폴리스티렌 용기에 적합한 이지필 필름용 수지조성물에 관한 것이다.The present invention relates to a resin composition having easy-filling properties for not only a polypropylene container but also a polystyrene container. More specifically, the EVA having a vinyl acetate content of 22 to 46 wt% based on the total EVA resin is 30 to 30% of the total resin composition. 80% by weight of LDPE is suitable for polypropylene and polystyrene containers with 10-40% by weight of the total resin composition and 10-30% by weight of ethylene alphaolefin resin with comonomer C8. It relates to a resin composition for easy peel film.
이지필 필름, 폴리프로필렌, 폴리스티렌, 박리강도Easyfill Film, Polypropylene, Polystyrene, Peel Strength
Description
도 1은 박리강도가 지나치게 높아 이지필층이 분리되는 현상을 도시한 것.Figure 1 illustrates the phenomenon that the peel peel strength is too high, the easy peel layer.
본 발명은 폴리프로필렌 용기 뿐만 아니라 폴리스티렌 용기에 대해서도 이지필 특성을 가지는 수지 조성물에 관한 것으로써 보다 상세하게는 에틸렌비닐아세테이트 수지(이하 EVA), 저밀도폴리에틸렌 수지(이하 LDPE), 코모노머가 C8인 에틸렌알파올레핀 수지로 구성되어 폴리프로필렌 용기 뿐만 아니라 폴리스티렌 용기에 적용시 이지필 발현이 가능한 필름용 수지조성물에 관한 것이다.The present invention relates to a resin composition having easy-filling properties for not only a polypropylene container but also a polystyrene container. The present invention relates to a resin composition for film, which is composed of an olefin resin and can be expressed in a polypropylene container as well as a polystyrene container.
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 보존중시 개념에서 디자인 측면과 감각적 측면으로 전환되어 가는 추세이며, 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 packaging concept has been developed along with the development of instant industry, medicine industry, and dessert industry. It is a trend that is shifting from the concept of preservation to the design and sensory aspects, and the one that appeared as an easy peel film is easy to open.
이지필 필름은 상용성이 서로 다른 폴리머들로 구성되어 접착기재에 열융착시 기재와 필름간의 상용특성, 비상용특성의 적절한 균형을 유지시킴을 통해 제조된다. 이지필 필름의 상용특성은 강한 접착력 확보로 내용물을 안전하게 보존시킬 수 있으며, 비상용특성은 개봉시 쉽게 뜯을 수 있도록 이개봉성을 부여한다.The easy-fill film is made of polymers having different compatibility, and are manufactured by maintaining an appropriate balance of compatibility and incompatibility between the substrate and the film when heat-sealing the adhesive base. The commercial property of the easy peel film can securely preserve the contents by securing strong adhesive force, and the non-commercial property gives the easy opening property so that it can be easily opened when opened.
그러므로 이지필 필름의 가장 핵심적인 기술은 상용성이 서로 다른 적절한 폴리머들의 선정 및 이들간의 적절한 혼합비율 확보 및 연속상과 분산상의 모폴러지(morphology)를 안정화시킬 수 있는 적절한 가공조건 확보 기술이다.Therefore, the most essential technology of the easy-fill film is the selection of suitable polymers having different compatibility and the appropriate mixing ratio between them, and the appropriate processing conditions to secure the morphology (morphology) of the continuous phase and the dispersed phase.
종래의 기술을 살펴 보면, 대한민국 특허출원 97-72630의 경우 조성물이 폴리프로필렌/폴리에틸렌/폴리스티렌(PP/PE/PS)으로 구성되어 폴리프로필렌 용기에 대해 1.0~1.5kg/15mm의 박리강도를 확보할 수 있으나 폴리스티렌 용기에는 열접착이 되지 않는다.Looking at the prior art, the Korean patent application 97-72630 is composed of polypropylene / polyethylene / polystyrene (PP / PE / PS) composition to ensure a peel strength of 1.0 ~ 1.5kg / 15mm for the polypropylene container However, the polystyrene container is not heat bonded.
대한민국 특허출원 99-22276도 폴리프로필렌에 대해 이지필 필름으로써 내열성을 확보할 수 있지만 폴리스티렌 용기에는 마찬가지로 열접착 자체가 되질 않는다.Korean Patent Application No. 99-22276 can also secure heat resistance as an easy-fill film for polypropylene, but the polystyrene container does not become thermally bonded itself as well.
미국특허 US 5,620,802의 경우 폴리스티렌과 에틸렌-아크릴계 공중합체로 구성되어 폴리스티렌 용기에 대해 이지필 특성을 갖는 필름을 제공하고 있으나 폴리프로필렌 용기에는 히트실링이 되지 않는다.US Pat. No. 5,620,802 is composed of polystyrene and an ethylene-acrylic copolymer to provide a film having easy-fill properties for a polystyrene container, but the polypropylene container is not heat sealed.
또한 미국특허 US 5,597,865의 경우 에틸렌/에스터 코폴리머와 폴리스티렌, SEBS로 구성되어 폴리스티렌에 접착성을 부여하였으나 이것도 폴리프로필렌에 대해서는 히트실링성이 매우 약하다.In addition, US Pat. No. 5,597,865 is composed of ethylene / ester copolymer, polystyrene, and SEBS to impart adhesiveness to polystyrene, but this is also very poor in heat sealing for polypropylene.
따라서, 본 발명의 목적은 상기 문제점을 극복하고 포장용기로서 널리 사용되는 폴리프로필렌 용기와 폴리스티렌 용기에 동시에 적용할 수 있는 이지필 필름용 수지 조성물을 제공하려는 것이다.Accordingly, it is an object of the present invention to overcome the above problems and to provide a resin composition for easy-fill film that can be simultaneously applied to a polypropylene container and a polystyrene container which are widely used as packaging containers.
본 발명자는 상기 문제점을 개선하기 위해 노력한 결과 폴리프로필렌 수지 및 폴리스티렌 수지를 사용하지 않고도 각각의 용기에 대해서 이지필 특성을 발현할 수 있는 이지필 필름용 수지 조성물을 개발하게 되었다.The present inventors have made efforts to improve the above problems and have developed a resin composition for easy peel film that can express easy peel properties for each container without using polypropylene resin and polystyrene resin.
본 발명의 이지필 필름 수지조성물은 비닐아세테이트의 함량이 전체 EVA 수지 대비 22~46중량%인 EVA를 전체 수지조성물에 대해 30~80중량%를 사용하며, LDPE를 전체 수지조성물에 대해 10~40중량%, 코모노머가 C8인 에틸렌 알파올레핀수지가 전체수지조성물에 대해 10~30중량%로 구성된 폴리프로필렌 용기 및 폴리스티렌 용기에 적합한 이지필 필름용 수지조성물에 관한 것이다.The easy-fill film resin composition of the present invention is 30 to 80% by weight of the total resin composition of EVA, the vinyl acetate content of 22 to 46% by weight of the total EVA resin, 10 to 40% by weight of LDPE to the total resin composition %, And the resin composition for easy-fill film suitable for the polypropylene container and polystyrene container which the ethylene alpha olefin resin whose comonomer is C8 is 10-30 weight% with respect to the whole resin composition.
아래에서 좀더 구체적으로 본 발명의 구성을 설명한다.Hereinafter, the configuration of the present invention in more detail.
본 발명의 이지필 필름용 수지조성물은 기초수지로 비닐아세테이트의 함량이 전체 EVA 수지 대비 22~46중량%인 EVA를 사용하였다. EVA는 전체 수지 조성물에 대해 30~80중량%가 사용된다. 첨가되는 수지로는 LDPE 10~40중량%, 코모노머가 C8인 에틸렌 알파올레핀 수지 10~30중량%로 구성되며, 이것을 용융블렌딩하여 펠렛화한 후 필름을 성형하였을 때 폴리프로필렌 용기 뿐만 아니라 폴리스티렌 용기에도 이지필 필름으로써 적용이 가능한 것이 그 특징이다.In the resin composition for easy peel film of the present invention, EVA was used as the base resin, in which the content of vinyl acetate was 22 to 46% by weight relative to the total EVA resin. EVA is used in an amount of 30 to 80% by weight based on the total resin composition. The resin to be added is composed of 10 to 40% by weight of LDPE and 10 to 30% by weight of ethylene alpha olefin resin having a comonomer of C8, which is melt blended and pelletized to form a film, and then a polystyrene container as well as a polystyrene container. The feature is that it can be applied as an easy peel film.
본 발명의 수지조성물에서 EVA는 비닐아세테이트의 함량이 전체 EVA 수지 대비 22~46중량%인 것을 전체수지에 대해 30~80중량%를 사용하였는데, 이 중 EVA 수지는 비닐아세테이트의 함량이 28~40중량%인 것이 더욱 바람직하다. 또한 EVA 수지는 전체 수지 조성물 대비 50~70중량%인 것이 더욱 바람직하다.In the resin composition of the present invention, the amount of vinyl acetate was 22 to 46% by weight relative to the total EVA resin, and 30 to 80% by weight of the total resin was used. Among them, the EVA resin was 28 to 40%. It is more preferable that it is weight%. In addition, the EVA resin is more preferably 50 to 70% by weight relative to the total resin composition.
EVA의 비닐아세테이트의 함량이 22% 미만일 경우 폴리프로필렌 용기 뿐만 아니라 폴리스티렌 용기에도 열접착력이 매우 약해 베이스 수지로 사용할 수가 없으며, 비닐아세테이트의 함량이 46%를 초과할 경우 수지 자체가 매우 끈적끈적거려 베이스 수지 자체를 공장에서 생산하기가 매우 어렵다.If the vinyl acetate content of EVA is less than 22%, the thermal adhesive strength is very weak in the polypropylene container as well as the polypropylene container, and it can not be used as a base resin. The resin itself is very difficult to produce at the factory.
한편, 이러한 EVA가 전체수지 대비 30% 미만일 경우에는 비닐아세테이트의 함량이 20% 미만일 때와 마찬가지로 폴리프로필렌 용기 및 폴리스티렌 용기에 대해 박리강도가 약하며, EVA가 80중량%가 넘을 경우 박리강도가 너무강해 박리시 필름이 연신되거나 끊어지는 현상이 발생할 수가 있다.On the other hand, when the EVA is less than 30% of the total resin, the peel strength is weak for the polypropylene container and the polystyrene container as in the case where the vinyl acetate content is less than 20%, and the peel strength is too strong when the EVA exceeds 80% by weight. When peeling, the film may be stretched or broken.
LDPE는 상기필름이 폴리프로필렌 용기와 폴리스티렌 용기에 열접착시 박리성을 부여하는 요소로써, 전체수지 대비 10~40중량%를 사용하며, 이중 20~30중량%일때가 가장 적합하다. 사용한 LDPE의 함량이 10중량% 미만일 경우에는 박리강도가 너무 강해 이지필 특성이 나빠질 수 있으며, LDPE의 함량이 40%를 넘어갈 경우, 박리강도가 너무 약해 포장용 필름으로 사용하기가 어렵다.LDPE is a factor that imparts peelability when the film is heat-bonded to a polypropylene container and a polystyrene container, using 10 to 40% by weight relative to the total resin, of which 20 to 30% by weight is most suitable. If the content of the used LDPE is less than 10% by weight, the peel strength is too strong, the easy peel characteristics may be worse. If the content of the LDPE exceeds 40%, the peel strength is too weak to use as a packaging film.
코모노머가 C8인 에틸렌 알파올레핀 수지는 폴리프로필렌 용기에 대해 강한 접착특성을 나타내며, 폴리스티렌 용기에 대해서는 박리특성을 나타낸다. 본 수지는 상기전체 조성에 대해 10~30중량%를 사용하는데, 그 함량이 10중량% 미만일 때 에는 폴리스티렌 용기에 대해 강한 접착력을 나타내어 이지필 특성이 떨어지며, 그 함량이 30중량%를 초과하면 반대로 폴리프로필렌 용기에 대해 강한 접착력을 나타내어 이지필 특성이 떨어지게 된다.Ethylene alphaolefin resins having a comonomer of C8 exhibit strong adhesion to polypropylene vessels and exfoliation to polystyrene vessels. The resin uses 10 to 30% by weight based on the total composition, when the content is less than 10% by weight exhibits a strong adhesion to the polystyrene container, the easy peel properties are lower, if the content exceeds 30% by weight poly It shows strong adhesion to the propylene container, resulting in poor easy-filling properties.
본 발명은 이하 실시예와 비교예를 통해 좀더 구체적으로 이해될 수 있으며, 이하 실시예와 비교예는 본 발명의 범위를 한정하고자 하는 것이 아니라 예시적인 목적으로 기재하는 것으로 실시예와 비교예에 따른 필름의 요구특성인 박리강도 시험을 다음과 같이 평가하였다.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 to be described for illustrative purposes according to the examples and comparative examples The peel strength test, which is a required characteristic of the film, was evaluated as follows.
1. 박리강도 시험1. Peel strength test
필링강도는 25mm x 10mm 크기의 필름을 두께가 250㎛인 폴리프로필렌 시트와 폴리스티렌 시트에 히트실링시킨 후 이것을 15mm x 10mm 크기로 잘라 UTM에서 세로방향으로 박리시킨다. 이때 측정되는 강도의 최고값을 박리강도로 선정하였다. 박리속도는 200mm/min이었다.Peeling strength is 25mm x 10mm film heat-sealed in a polypropylene sheet and a polystyrene sheet having a thickness of 250㎛ and then cut to 15mm x 10mm in a longitudinal direction peeled from the UTM. The maximum value of the strength measured at this time was selected as the peel strength. Peeling rate was 200 mm / min.
박리강도가 너무 강할 경우에는 필름이 연신되거나 찢어지는 현상이 발생된다. 물론 박리강도가 너무 약할 경우에는 포장의 역할을 상실하게 되므로 적정 수준의 필링강도 유지가 중요하다. 통상적으로 성인이 개봉할 수 있는 박리강도는 2.0kg/15mm 이하로 일반적으로 필름의 박리강도는 0.5~1.6kg/15mm가 적합하다. 그러나 본 발명의 수지조성물로 필름을 성형할 경우 박리강도가 1.2kg/15mm를 넘으면, 박리시 실링층인 이지필층 자체가 깨지면서(도 1 참조) 히트실링부위 뿐만아니라 실링안한부분까지도 전이되기 때문에 박리부위가 매우 지저분하게 된다. 그러 므로 본 필름의 박리강도 목표 수준을 0.5~1.2kg/15mm 수준으로 선정하였다.If the peel strength is too strong, the film may be stretched or torn. Of course, if the peel strength is too weak, the role of the packaging will be lost, so maintaining the proper level of peeling strength is important. Usually peeling strength that can be opened by adults is 2.0kg / 15mm or less in general, peeling strength of the film is 0.5 ~ 1.6kg / 15mm is suitable. However, when the film is formed from the resin composition of the present invention, when the peel strength exceeds 1.2 kg / 15 mm, the peeling of the easy peel layer itself, which is a sealing layer during peeling, is broken (see FIG. 1). The site is very messy. Therefore, the target peel strength of the film was selected to be 0.5 ~ 1.2kg / 15mm.
(실시예 1~4, 비교예 1~4)(Examples 1-4, Comparative Examples 1-4)
표 1의 수지조성물은 30ψ 이축스쿠루 압출기에서 160℃로 용융브렌딩하여 펠렛화한 후 이것을 블로운 필름 성형기에서 40㎛의 두께로 이층필름을 성형하였다. 이때, 이층필름 중 내층은 이지필 수지로, 외층은 코모노머가 부텐인 선형저밀도폴리에틸렌(MI 0.9, S사 4220F)을 사용하였다. 각각의 필름의 두께는 이지필층이 20㎛, 4220F가 20㎛이었다. 또한, 필름성형시 외층인 선형저밀도 폴리에틸렌 층에 코로나를 42다인 처리하였다.The resin composition of Table 1 was melt blended and pelletized at 160 ° C. in a 30ψ twin screw extruder, and then formed into a double layer film with a thickness of 40 μm in a blown film molding machine. At this time, the inner layer of the bilayer film was an easy-fill resin, the outer layer was used a linear low density polyethylene (MI 0.9, S220 4220F) butene comonomer. The thickness of each film was 20 micrometers in the easy peel layer, and 20 micrometers in 4220F. In addition, corona was treated with 42 dynes in the linear low density polyethylene layer which is the outer layer during film forming.
이렇게 성형된 필름을, 두께가 16㎛ PET 필름으로 드라이라미네이션시킨 다음 폴리프로필렌 시트와 폴리스티렌 시트에 히트실링시켜 박리강도를 측정하였다. 각각의 측정 결과는 표 1에 나타내었다.The thus formed film was dry laminated with a 16 μm PET film, and then heat-sealed in a polypropylene sheet and a polystyrene sheet to measure peel strength. Each measurement result is shown in Table 1.
( 박리강도 측정을 위한 히트실링 방법 )(Heat sealing method for measuring peel strength)
1. 시편제막: 필름과 피접착재(폴리프로필렌/폴리스티렌 시트)의 크기를 각각 5cm x 30cm의 크기로 자른다.1. Specimen Formation: Cut the size of the film and the adhesive (polypropylene / polystyrene sheet) into 5 cm x 30 cm, respectively.
2. 히트실링: 각각의 시트위에 필름을 25mm x 10mm의 크기로 히트실링시켰으며, 실링온도는 140℃∼200℃ 범위에서 20℃ 간격으로 실시하였다. 이때 히트실링 압력은 2kgf/㎠이었으며, 시간은 1초였다.2. Heat sealing: Films were heat sealed on each sheet in a size of 25 mm × 10 mm, and the sealing temperature was performed at intervals of 20 ° C. in a range of 140 ° C. to 200 ° C. At this time, the heat sealing pressure was 2kgf / cm 2, and the time was 1 second.
상기와 같이 본 발명의 수지 조성물은 폴리프로필렌 수지 및 폴리스티렌 수지를 사용하지 않고도 150℃ 이하에서 폴리프로필렌 용기 및 폴리스티렌 용기에 대해 히트실링이 가능하고 히트실링온도 200℃ 이하의 범위에서 0.5~1.2kg/15mm의 박리강도를 나타내어 이지필 필름용으로 적합하다.As described above, the resin composition of the present invention can heat seal the polypropylene container and the polystyrene container at 150 ° C. or lower without using the polypropylene resin and the polystyrene resin, and 0.5 to 1.2 kg / in the heat sealing temperature of 200 ° C. or lower. It has a peel strength of 15 mm and is suitable for easy peel film.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5516583A (en) * | 1994-08-29 | 1996-05-14 | E. I. Du Pont De Nemours And Company | Adhesive for tamper evident seals |
| KR19980070811A (en) * | 1997-01-30 | 1998-10-26 | 사또아끼오 | Multilayer film for packaging |
| KR19990016442A (en) * | 1997-08-14 | 1999-03-05 | 유현식 | Resin composition for low voltage power cable insulation |
| KR20000008188A (en) * | 1998-07-10 | 2000-02-07 | 유현식 | Resin composition for easy peel film |
| KR20000019435A (en) * | 1998-09-11 | 2000-04-15 | 유현식 | Resin composition for easy peel film |
| KR20000055102A (en) * | 1999-02-03 | 2000-09-05 | 유현식 | High-speed packaging enabled resin composition for snack-packaging and easy-peel film |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5516583A (en) * | 1994-08-29 | 1996-05-14 | E. I. Du Pont De Nemours And Company | Adhesive for tamper evident seals |
| KR19980070811A (en) * | 1997-01-30 | 1998-10-26 | 사또아끼오 | Multilayer film for packaging |
| KR19990016442A (en) * | 1997-08-14 | 1999-03-05 | 유현식 | Resin composition for low voltage power cable insulation |
| KR20000008188A (en) * | 1998-07-10 | 2000-02-07 | 유현식 | Resin composition for easy peel film |
| KR20000019435A (en) * | 1998-09-11 | 2000-04-15 | 유현식 | Resin composition for easy peel film |
| KR20000055102A (en) * | 1999-02-03 | 2000-09-05 | 유현식 | High-speed packaging enabled resin composition for snack-packaging and easy-peel film |
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