KR100252823B1 - White-colored multi layered polyolefin film for wrapping materials - Google Patents

White-colored multi layered polyolefin film for wrapping materials Download PDF

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KR100252823B1
KR100252823B1 KR1019970070515A KR19970070515A KR100252823B1 KR 100252823 B1 KR100252823 B1 KR 100252823B1 KR 1019970070515 A KR1019970070515 A KR 1019970070515A KR 19970070515 A KR19970070515 A KR 19970070515A KR 100252823 B1 KR100252823 B1 KR 100252823B1
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film
white
inorganic particles
ethylene
polyolefin film
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KR1019970070515A
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KR19990051234A (en
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장욱
김문선
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장용균
에스케이씨주식회사
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • 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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • 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
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/16—Ethene-propene or ethene-propene-diene copolymers

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

PURPOSE: A white multilayer polyolefin film for packing materials is provided to have good slip, tensile intensity, heat adhesion and elongation properties, be useful for various packing materials and eliminate deviation of whiteness. CONSTITUTION: The white polyolefin film having two layers or three layers comprises a center layer containing white inorganic particles; and surface layer consisting of ethylene-propylene copolymer positioned in the one side or both sides of the center layer. The white inorganic particles have particle size of 0.01 to 10 micrometer, and are pre-treated with silane coupling agent of 5 to 20 % by weight based on polypropylene resin. The ethylene-propylene copolymer has melting point of 100-160deg.C and melt flow index of 1-15g/10min. The thickness of surface layer is 1/40 to 1/3 based on the total thickness of the film. The polyolefin film has good tensile intensity, heat adhesion and elongation properties.

Description

[발명의 명칭][Name of invention]

포장재용 백색 다층 폴리올레핀 필름White Multilayer Polyolefin Film for Packaging Materials

[발명의 상세한 설명]Detailed description of the invention

[발명의 목적][Purpose of invention]

[발명이 속하는 기술분야 및 그 분야의 종래기술][Technical field to which the invention belongs and the prior art in that field]

본 발명은 다층 폴리올레핀 필름에 관한 것으로, 보다 상세하게는 폴리프로필렌계 수지 및 전처리된 백색 무기입자를 포함하는 중심층, 및 에틸렌-프로필렌 공중합체로 이루어진 표면층을 포함하는 2층 또는 3층 구조에 백색 폴리올레핀 필름에 관한 것이다.The present invention relates to a multilayer polyolefin film, and more particularly, to a two- or three-layer structure comprising a center layer comprising a polypropylene resin and pretreated white inorganic particles, and a surface layer made of an ethylene-propylene copolymer. It relates to a polyolefin film.

점차 사회가 현대화되면서 단순한 의식주 해결 위주의 생활방식에서 벗어나 편의성과 효율성 위주의 생활을 요구하게 되었고, 그 결과, 취급이 편리하고 장기간 내용물 보관이 가능한 포장용기, 문구류, 사무용품, 전기제품, 공구류, 완구류에 걸친 범용 플라스틱 필름의 시장 수요가 점차 증가하고 있으며, 특히 최근에는 내용물을 내용물을 바깥에서 볼 수 없도록 은폐할 수 있는 불투명 플라스틱 필름 제품의 수요가 늘어나는 추세이다. 이러한 용도로 사용할 수 있는 대표적인 불투명 플라스틱 필름으로는 백색 폴리에틸렌테레프탈레이트 필름이 있으나, 이는 백색도는 우수하나 가격이 고가이고 뻣뻣하며, 가공조건이 매우 까다로운 단점이 있다.Increasingly modernized society has led to the demand for convenience and efficiency-oriented lifestyles beyond simple lifestyle solutions. As a result, packaging containers, stationery, office supplies, electrical appliances, tools, toys, etc. The market demand for general-purpose plastic films over time is gradually increasing, and in particular, the demand for opaque plastic film products that can conceal the contents so that they cannot be seen from the outside is increasing recently. Typical opaque plastic films that can be used for this purpose include a white polyethylene terephthalate film, which is excellent in whiteness, but is expensive and stiff, and has very difficult processing conditions.

이러한 문제점이 없으면서, 불투명 필름으로서의 요구조건을 만족할 수 있는 대체수지로서 백색 폴리올레핀계 수지는 가격이 저렴하여 각광받고 있으며, 사용범위와 용도는 급속도로 다양해지고 있는 추세이다.Without such a problem, white polyolefin-based resins are attracting attention because of their low price, and the range of use and usage are rapidly diversified as alternative resins that can satisfy the requirements of an opaque film.

그러나, 백색 폴리올레핀계 수지는 일반 폴리올레핀계 수지에 비해 연신 등의 가공성이 떨어지고, 일반 포장용과 같이 필름과 필름을 라미네이트 가공하는 경우 열접착 강도가 떨어지며 백색 무기입자가 충분히 혼련되지 못한 경우에는 부위별 백색도가 차이나는 문제점이 있다.However, white polyolefin-based resins have poor processability, such as stretching, compared to general polyolefin-based resins, and have low thermal adhesive strength when laminating films and films as in general packaging, and whiteness by part when white inorganic particles are not sufficiently kneaded. There is a difference.

종래의 백색 폴레올레핀 필름을 제조하기 위한 기술문헌을 살펴보면 다음과 같다. 미합중국 특허 제 4,931,327 호에서는 폴리올레핀 수지내에 무기입자를 첨가하여 백색 필름을 제조하는 방법에 대하여 기술하였으나, 수지내에 부기입자를 첨가할 경우 연신성이 떨어져 연신과정에서 파단이 자주 일어나는 문제가 있다. 한편, 미합중국 특허 제 5,134,173 호에서는 열가소성 수지에 가교된 폴리스티렌 고체 입자를 첨가하여 연신과정에서 기공을 형성함으로써 필름을 백화시키는 방법이 기술되어 있으나 폴리스티렌 고체입자의 열가소성 수지에 대한 분산이 어렵다. 또한, 미합중국 특허 제 4,615,942 호에서는 폴리프로필렌계 수지에 연신 후 기공을 형성할 수 있는 고체물질로 나일론을 첨가하고 나일론의 폴리프로필렌에 대한 분산성을 향상시키기 위하여 상용화제를 함께 첨가하는 방법이 기술되어 있다. 이 방법을 사용하면, 무기입자의 분산성이 향상되고, 필름에 무기입자를 첨가사키는 방법보다 연신성이 우수하여 연신 공정에서의 파단 등의 문제가 발생하지 않지만 일반 포장용과 같이 필름과 필름을 라미네이트 가공할 필요가 있을 때 그 접착강도가 매우 낮은 단점이 있다.Looking at the technical literature for producing a conventional white polyolefin film is as follows. In US Pat. No. 4,931,327, a method of preparing a white film by adding inorganic particles to a polyolefin resin is described. However, when adding auxiliary particles to the resin, there is a problem in that breakage occurs frequently in the stretching process. Meanwhile, US Pat. No. 5,134,173 describes a method of whitening a film by adding crosslinked polystyrene solid particles to a thermoplastic resin to form pores in the stretching process, but it is difficult to disperse the polystyrene solid particles into the thermoplastic resin. In addition, U.S. Patent No. 4,615,942 describes a method of adding nylon as a solid material capable of forming pores after stretching to a polypropylene resin and adding a compatibilizer together to improve the dispersibility of the polypropylene into the polypropylene resin. have. When this method is used, dispersibility of inorganic particles is improved, and the stretching property is superior to the method of adding inorganic particles to the film, so that problems such as fracture in the stretching process do not occur. When the laminate needs to be processed, the adhesive strength is very low.

[발명이 이루고자 하는 기술적 과제][Technical problem to be achieved]

따라서, 본 발명은 상기 단점을 해소하여 연신성 및 열접착성이 향상되고, 무기입자를 수지내에 원활히 분산시킴으로써 필름 부위별 백색도의 편차를 없앤 다층 폴리올레핀 필름을 제공하는 것을 목적으로 한다.Accordingly, an object of the present invention is to provide a multi-layered polyolefin film which eliminates the above-mentioned drawbacks and improves stretchability and thermal adhesiveness, and smoothly disperses the inorganic particles in the resin, thereby eliminating the variation in whiteness for each film part.

[발명의 구성 및 작용][Configuration and Function of Invention]

상기 목적을 달성하기 위하여, 본 발명에서는 융점 160 내지 170℃ 및 용융흐름지구 1 내지 15g/10분의 폴리프로필렌계 수지 및 상기 폴리프로필렌계 수지에 대해 5 내지 20 중량%의 실란 커플링제로 전처리된 0.01 내지 10㎛ 입경의 백색 무기입자를 포함하는 중심층, 및 상기 중심층의 한 면 또는 양면에 위치한, 융점 100 내지 160℃ 및 용융흐름지수 1 내지 15g/10분의 에틸렌-프로필렌 공중합체로 이루어진 표면층을 포함하며, 상기 표면층의 두께가 필름 전체 두께에 대하여 1/40 내지 1/3 범위인, 2층 또는 3층 구조의 백색 폴리올레핀 필름을 제공한다.In order to achieve the above object, the present invention is pretreated with a polypropylene resin having a melting point of 160 to 170 ° C. and a melt flow region of 1 to 15 g / 10 minutes and a silane coupling agent of 5 to 20 wt% with respect to the polypropylene resin. A central layer comprising white inorganic particles having a particle size of 0.01 to 10 μm, and an ethylene-propylene copolymer having a melting point of 100 to 160 ° C. and a melt flow index of 1 to 15 g / 10 minutes, located on one or both surfaces of the central layer. A white polyolefin film comprising a surface layer, wherein the thickness of the surface layer ranges from 1/40 to 1/3 with respect to the overall thickness of the film.

이하 본 발명에 대하여 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명의 2층 또는 3층 구조의 폴리올레핀 필름의 중심층을 이루는 폴리프로필린계 수지의 예로는 아택틱(atactic) 폴리프로필렌 수지, 신디오택틱(syndiotactic) 폴리프로필렌 수지 및 아이소택틱(isotactic) 폴리프로필렌 수지가 있고, 바람직하게는 아이소택틱 폴리프로필렌 수지가 사용된다. 이들은 융점이 160 내지 170℃이고, 용융흐름지수(Melting Flow Index)가 1 내지 15g/10분, 밀도가 0.9 내지 0.91g/cm3이며, 아이소택틱 지수(isotactic index)가 95% 이상인 것이 바람직하다.Examples of polypropylene resins that form the center layer of the polyolefin film of the two-layer or three-layer structure of the present invention include atactic polypropylene resins, syndiotactic polypropylene resins, and isotactic polypropylenes. Propylene resins, preferably isotactic polypropylene resins. They have a melting point of 160 to 170 ° C, a melting flow index of 1 to 15 g / 10 minutes, a density of 0.9 to 0.91 g / cm 3 , and an isotactic index of 95% or more. Do.

상기 폴리프로필렌계 수지에 첨가되는 백색 무기입자는 본 발명의 필름에 백색을 부여하기 위한 용도로 사용되며, 황산바륨, 이산화티탄, 티탄 화합물, 이산화규소, 탄산칼슘, 산화마그네슘, 실리카, 카올린, 제올라이트 및 탈크로 이루어진 군에서 선택된 적어도 하나가 사용된다.The white inorganic particles added to the polypropylene resin are used to impart white color to the film of the present invention, and include barium sulfate, titanium dioxide, titanium compounds, silicon dioxide, calcium carbonate, magnesium oxide, silica, kaolin, and zeolite. And at least one selected from the group consisting of talc.

상기 백색무기입자의 입경은 0.01 내지 10㎛인 것이 바람직하다. 입경이 0.01㎛ 미만인 경우에는 필름의 백화 효과가 미미하며, 10㎛를 초과하는 경우에는 중심층의 표면이 지나치게 거칠어져 표면층과 라미네이트되는 면이 분리되기 쉽고, 연신성 또한 저하된다.The particle size of the white inorganic particles is preferably 0.01 to 10㎛. When the particle size is less than 0.01 μm, the whitening effect of the film is insignificant. When the particle size exceeds 10 μm, the surface of the center layer becomes too rough, and the surface layer and the surface to be laminated are easily separated, and the stretchability is also lowered.

본 발명에서 백색 무기입자의 함유량은 상기 폴리프로필린계 수지의 중량을 기준으로 5 내지 20 중량%가 바람직하다. 5중량% 미만으로 첨가되는 경우에는 백색 무기입자의 첨가 효과가 미미하고, 20 중량%를 초과하여 첨가되는 경우에는 필름 제조 공정 중 압출기의 필터가 무기입자에 의하여 막히거나, 최종 필름의 연신성이 저하되어 파단이 발생하고, 표면층과의 접착력이 떨어져서 층분리가 일어나기 쉽다.In the present invention, the content of the white inorganic particles is preferably 5 to 20% by weight based on the weight of the polypropylene resin. When added in less than 5% by weight, the addition effect of the white inorganic particles is insignificant, and when added in excess of 20% by weight, the filter of the extruder is blocked by the inorganic particles during the film manufacturing process, or the stretchability of the final film The breakage occurs and breakage occurs, and the adhesion to the surface layer is poor, and layer separation is likely to occur.

본 발명의 백색 무기입자는 폴리프로필렌계 수지에서의 분산성을 향상시키기 위하여 전처리되는 것이 바람직하다. 전처리 공정은 에틸렌 글리콜과 같은 글리콜에 백색 무기입자를 분산시킨 후, 백색 무기입자의 중량을 기준으로 0.05 내지 5 중량%의 실란 커플링제를 첨가함으로써 수행된다. 상기 실란 커플링제는 모노-실란 성분이 90% 이상인 것이 바람직하다.It is preferable that the white inorganic particle of this invention is pretreated in order to improve the dispersibility in polypropylene resin. The pretreatment process is carried out by dispersing the white inorganic particles in a glycol such as ethylene glycol and then adding 0.05 to 5% by weight of the silane coupling agent based on the weight of the white inorganic particles. The silane coupling agent preferably has a mono-silane component of at least 90%.

한편, 본 발명의 2층 또는 3층 구조의 폴리올레핀 필름의 표면층을 이루는 에틸렌-프로필렌 공중합체는 융점이 100 내지 160℃이고, 용융흐름지수가 1 내지 15g/10분, 바람직하게는 1 내지 5g/10분인 것이 좋다. 에티렌-프로필렌 공중합체의 요융흐름지수가 15g/10분을 초과하는 경우에는 수지의 분자량이 너무 작아 기계적 물성이 떨어지며 용융흐름지수가 1g/10분 미만인 경우에는 수지의 분자량이 너무 높고, 필름 성형시 균일한 표면층의 두께를 얻기 어렵다. 또한, 용융 온도가 100℃ 미만인 경우에는 역시 기계적 강도가 떨어지고 용융온도가 160℃를 초과하는 경우에는 역시 필름 성형시 균일한 표면층의 두께를 얻기 어렵다.On the other hand, the ethylene-propylene copolymer forming the surface layer of the polyolefin film of the two-layer or three-layer structure of the present invention has a melting point of 100 to 160 ℃, melt flow index of 1 to 15g / 10 minutes, preferably 1 to 5g / 10 minutes is good. When the melt flow index of the ethylene-propylene copolymer exceeds 15 g / 10 minutes, the molecular weight of the resin is too small to degrade the mechanical properties. When the melt flow index is less than 1 g / 10 minutes, the molecular weight of the resin is too high. It is difficult to obtain a uniform surface layer thickness at the time. In addition, when the melting temperature is less than 100 ℃ also the mechanical strength is lowered, and when the melting temperature exceeds 160 ℃ it is also difficult to obtain a uniform thickness of the surface layer during film molding.

상기 에틸렌-프로필렌 공중합체 중의 에틸렌 함량은 0.5 내지 50 중량%인 것이 바람직하다. 에틸렌 함량이 0.5 중량% 미만이면, 열접착성 및 증착강도가 떨어지고, 에틸렌 함량이 50 중량%를 초과하면, 필름의 슬립성이 불량해 진다.The ethylene content in the ethylene-propylene copolymer is preferably 0.5 to 50% by weight. If the ethylene content is less than 0.5% by weight, the thermal adhesiveness and the deposition strength are lowered, and if the ethylene content is more than 50% by weight, the slipperiness of the film becomes poor.

상기 에틸렌-프로필렌 공중합체로 이루어진 표면층 전체의 두께는 필름 전체 두께에 대하여 1/40 내지 1/3, 더욱 바람직하게는 1/40 내지 1/7이다. 이때, 표면층 전체의 두께가 1/40 이하일 경우에는 본 발명의 효과를 얻기 어렵고, 1/3 이상인 경우에는 기계적 강도가 현저히 떨어진다.The thickness of the entire surface layer made of the ethylene-propylene copolymer is 1/40 to 1/3, more preferably 1/40 to 1/7, based on the total film thickness. At this time, when the thickness of the whole surface layer is 1/40 or less, the effect of this invention is hard to be acquired, and when 1/3 or more, mechanical strength falls remarkably.

본 발명의 3층구조의 필름은 다음과 같이 제조할 수 있다.The film of the three-layer structure of this invention can be manufactured as follows.

먼저, 전처리된 백색 무기입자가 첨가된 폴리프로필렌계 수지를 중심층으로 하고, 미세한 실리카가 첨가된 에틸렌-프로필렌 공중합체를 표면층으로 하여 공압출기를 사용하여 250 내지 300℃의 온도에서 공압출시켜 2층 또는 3층 구조의 시이트를 제조한후 수득한 시이트를 냉각드럼에서 성형하면서 10 내지 50℃로 급냉시키고, 이축연신기를 사용하여 140 내지 190℃에서 세로방향으로 2 내지 5배 연신하고, 140 내지 200℃에서 가로방향으로 3 내지 8배 연신한 후, 150 내지 200℃에서 열고정시켜 3층 구조의 이축배향 필름을 얻는다.First, the polypropylene-based resin to which the pre-treated white inorganic particles are added is used as the main layer, and the fine silica-added ethylene-propylene copolymer is used as the surface layer and coextruded at a temperature of 250 to 300 ° C. using a coextruder. After preparing a sheet having a layer or three-layer structure, the sheet obtained was quenched at 10 to 50 ° C. while being molded in a cooling drum, stretched 2 to 5 times in a longitudinal direction at 140 to 190 ° C. using a biaxial stretching machine, and 140 to After stretching 3 to 8 times in the transverse direction at 200 ° C., heat setting is performed at 150 to 200 ° C. to obtain a biaxially oriented film having a three-layer structure.

이하, 실시예를 통하여 본 발명을 더욱 상세히 설명한다. 단 본 발명의 범위가 하기 실시예만으로 한정되는 것은 아니다. 본 발명의 실시예 및 비교예에서 제조된 필름의 각종 성능 평가는 다음 방법으로 실시하였다 :Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited only to the following examples. Various performance evaluations of the films produced in Examples and Comparative Examples of the present invention were carried out by the following method:

(1) 백색도의 R차(1) R degree of whiteness

필름의 폭방향으로 10개의 부위를 선정하여 백색도를 측정하고 최고값과 최소값의 차이를 "백색도의 R차"로 정의하였다.Ten portions were selected in the width direction of the film to measure whiteness, and the difference between the highest value and the minimum value was defined as "R difference of whiteness".

백색도는, JIS-L-1015에 의해 450nm에서의 반사율(B%)과 550nm에서의 반사율(G%)을 측정한 후, 이로부터 다음 식에 의해 계산하였다 : 백색도=4B-3GWhiteness was measured by the following formula after measuring the reflectance (B%) at 450 nm and reflectance (G%) at 550 nm by JIS-L-1015: Whiteness = 4B-3G

(2) 열접착강도(2) heat adhesive strength

도요세키(toyokeiki) 사(일본)의 열구배 시험기(Model: HG-100)를 이용하여 150℃에서 3kg/cm2의 압력으로 2초 동안 눌러 폴리에틸렌 필름과 본 발명의 폴리올레핀 필름의 코로나처리되지 않은 표면층을 봉합한 후 헤이돈(Heidon)사의 박리시험기(Peeling Tester)를 사용하여 25mm폭의 봉합 필름을 100mm/분의 속도로 당기면서 그 열접착 강도를 측정하였다.Uncorona treated polyethylene film and polyolefin film of the present invention by pressing for 2 seconds at a pressure of 3kg / cm 2 at 150 ℃ using a heat gradient tester (Model: HG-100) of Toyokeiki (Japan) After sealing the surface layer, the heat-bonding strength was measured while pulling a 25 mm wide sealing film at a rate of 100 mm / min using a Peeling Tester manufactured by Heidon.

(3) 연신성(3) extensibility

제막의 연신상태로부터 다음과 같이 판단하였다.It judged as follows from the extending | stretching state of a film forming.

○ : 파단이 전혀발생하지 않고 연신 얼룩이 없는 균질한 필름을 얻는 경우(Circle): When a homogeneous film which does not generate | occur | produce break at all and does not have extending | stretching stain is obtained.

△ : 약간의 파단이 있고 연신 얼룩이 없는 균질한 필름을 얻는 경우(Triangle | delta): When obtaining the homogeneous film which has a little fracture and does not have extending | stretching smudges.

× : 파단이 많이 발생하고, 연신한 경우에도 연신 얼룩이 있는 경우X: When a lot of breaks generate | occur | produce and there exists extending | stretching stain also when extending | stretching

[실시예 1]Example 1

입경 2㎛의 이산화티탄을 에틸렌 글리콜에 슬러리화 시킨 후, 티탄의 중량을 기준으로 2중량%의 실란 커플링제를 투입하여 티탄을 에틸렌 글리콜 중에서 상기 실란커플링제와 반응시켜 전처리된 티탄을 수득하였다. 용융흐름지수 4.0 g/분, 용융온도 155℃, 밀도 0.901g/cm3, 아이소택틱 지수 96%인 폴리프로필렌 수지에 전처리된 티탄을 상기 폴리프로필렌 수지의 중량을 기준으로 20 중량%의 양으로 첨가하여 혼합한다. 상기 혼합수지를 중심층으로 하고, 에틸렌-프로필렌 공중합체(에틸렌 함량 1.2 몰%)를 표면층으로 하여 250℃의 온도에서 다이를 통해 공압출시키고, 상기 수득한 시이트를 냉각드럼에서 성형하면서 30℃로 급냉시켜 850㎛ 두께의 시이트를 수득하였다.After titanium dioxide having a particle diameter of 2 μm was slurried in ethylene glycol, 2 wt% of a silane coupling agent was added based on the weight of titanium, and titanium was reacted with the silane coupling agent in ethylene glycol to obtain pretreated titanium. Titanium pretreated in a polypropylene resin having a melt flow index of 4.0 g / min, a melting temperature of 155 ° C., a density of 0.901 g / cm 3 , and an isotactic index of 96% was added in an amount of 20% by weight based on the weight of the polypropylene resin. Add and mix. The mixed resin was used as the center layer, and the ethylene-propylene copolymer (ethylene content 1.2 mol%) was used as the surface layer and coextruded through a die at a temperature of 250 ° C., and the sheet thus obtained was formed at 30 ° C. in a cooling drum. Rapid cooling gave a sheet of 850 μm thickness.

상기 시이트를 140℃의 온도로 재가열하면서 종연신 장치에서 5배 연신하고, 140℃에서 횡방향으로 8배 연신하고, 160℃에서 열고정시켜 20㎛ 두께의 필름을 얻었다.The sheet was stretched five times in the longitudinal stretching apparatus while being reheated to a temperature of 140 ° C., stretched eight times in the transverse direction at 140 ° C., and heat-set at 160 ° C. to obtain a 20 μm thick film.

상기 제조한 3층 구조의 폴리올레핀 필름의 성능평가를 실시하여 표 1에 나타내었다. 표 1에 나타낸 바와 같이 실시예 1에 의해 제조된 필름은 백색도의 R차, 열접착성, 연신성이 모두 우수하였다.The performance evaluation of the polyolefin film of the 3-layered structure produced above was performed, and is shown in Table 1. As shown in Table 1, the film produced in Example 1 was excellent in all of the R degree, thermal adhesiveness, and stretchability of whiteness.

[실시예 2 내지 10][Examples 2 to 10]

필름의 제조 조건을 표 1에서와 같이 변화시킴을 제외하고는 실시예 1과 동일한 방법으로 실시하여 본 발명의 3층 구조의 필름을 제조하였다.Except for changing the manufacturing conditions of the film as shown in Table 1 was carried out in the same manner as in Example 1 to prepare a three-layer film of the present invention.

상기 제조한 3층 구조의 폴리올레핀 필름의 성능평가를 실시하여 표 1에 나타내었다. 표 1에 나타낸 바와 같이 실시예 1에 의해 제조된 필름은 슬립성, 인장강도, 열접착강도, 증착강도가 우수하였다.The performance evaluation of the polyolefin film of the 3-layered structure produced above was performed, and is shown in Table 1. As shown in Table 1, the film prepared in Example 1 was excellent in slip property, tensile strength, thermal adhesive strength, and deposition strength.

[비교예 1 내지 5][Comparative Examples 1 to 5]

필름의 제조 조건을 표 1에서와 같이 변화시킴을 제외하고는 실시예 1과 동일한 방법으로 실시하여 3층 구조의 필름을 제조하였다.Except for changing the production conditions of the film as shown in Table 1 was carried out in the same manner as in Example 1 to prepare a three-layer film.

상기 제조한 3층 구조의 열가소성 필름의 성능평가를 실시하여 표 1에 나타내었다.The performance evaluation of the thermoplastic film of the three-layer structure manufactured above was performed, and is shown in Table 1.

Figure kpo00001
Figure kpo00001

[발명의 효과][Effects of the Invention]

이상에서 살펴본 바와 같이 본 발명의 2층 또는 3층 구조의 폴리올레핀 필름은 슬립성, 인장강도, 열접착강도, 증착강도가 우수하여 포장재 등으로 널리 사용할 수 있다.As described above, the polyolefin film having a two-layer or three-layer structure of the present invention can be widely used as a packaging material because of excellent slip property, tensile strength, thermal adhesive strength, and deposition strength.

Claims (6)

폴리프로필렌계 수지에 대해 5 내지 20 중량%의 실란 커플링제로 전처리된 0.01 내지 10㎛ 입경의 백색 무기입자를 포함하는 중심층, 및 상기 중심층의 한 면 또는 양면에 위치한, 융점 100 내지 160℃ 및 용융흐름지수 1 내지 15g/10분의 에틸렌-프로필렌 공중합체로 이루어진 표면층을 포함하며, 상기 표면층의 두께가 필름 전체 두께에 대하여 1/40 내지 1/3 범위인, 2층 또는 3층 구조의 백색 폴리올레핀 필름.A central layer comprising white inorganic particles having a particle size of 0.01 to 10 μm pretreated with 5 to 20 wt% of a silane coupling agent relative to the polypropylene resin, and a melting point of 100 to 160 ° C., located on one or both sides of the central layer And a surface layer composed of an ethylene-propylene copolymer having a melt flow index of 1 to 15 g / 10 minutes, wherein the thickness of the surface layer is in the range of 1/40 to 1/3 of the total thickness of the film. White polyolefin film. 제1항에 있어서, 상기 폴리프로필렌계 수지가, 밀도가 0.9 내지 0.91g/cm3, 아이소택틱 지수가 95% 이상인 아이소택틱 폴리프로필렌계 수지인 것을 특징으로 하는 필름.The film according to claim 1, wherein the polypropylene resin is an isotactic polypropylene resin having a density of 0.9 to 0.91 g / cm 3 and an isotactic index of 95% or more. 제1항에 있어서, 상기 에틸렌-프로필렌 공중합체의 에틸렌 함량이 0.5 내지 50%인 것을 특징으로 하는 필름.The film according to claim 1, wherein the ethylene content of the ethylene-propylene copolymer is 0.5 to 50%. 제1항에 있어서, 상기 백색 무기 입자가 황산바륨, 이산화티탄, 티탄 화합물, 이산화규소, 탄산칼슘, 산화마그네슘, 실리카, 카올린, 제올라이트 및 탈크로 이루어진 군에서 선택된 적어도 하나인 것을 특징으로 하는 필름.The film of claim 1, wherein the white inorganic particles are at least one selected from the group consisting of barium sulfate, titanium dioxide, titanium compounds, silicon dioxide, calcium carbonate, magnesium oxide, silica, kaolin, zeolite and talc. 상기 백색 무기 입자가, 무기 입자의 에틸렌 글리콜 분산액에 무기입자의 중량을 기준으로 0.05 내지 5 중량%의 실란 커플링제를 첨가함으로써 전처리된 것을 특징으로 하는 필름.The white inorganic particles are pretreated by adding 0.05 to 5% by weight of a silane coupling agent based on the weight of the inorganic particles to the ethylene glycol dispersion of the inorganic particles. 상기 실란 커플링제가 모노 실란 성분이 90%이상인 것을 특징으로 하는 필름.The said silane coupling agent is 90% or more of monosilane components, The film characterized by the above-mentioned.
KR1019970070515A 1997-12-19 1997-12-19 White-colored multi layered polyolefin film for wrapping materials KR100252823B1 (en)

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