KR102561535B1 - Composition for manufacturing easypeel film, easypeel film formed from the composition and manufacturing method thereof - Google Patents

Abstract

The present disclosure discloses a composition for preparing an easy-peel film, an easy-peel film formed from the composition, and a method for manufacturing the same. The composition may include a base layer composition including a polyolefin resin; and an easy-peel layer composition comprising a polypropylene resin, an adhesive resin, and a polybutylene resin. The composition provides an effect of enabling low-temperature sealing to a polyester-based substrate and improving sealing strength.

Description

Composition for producing easy-peel film, easy-peel film formed from the composition, and method for manufacturing the same

The present disclosure discloses a composition for preparing an easy-peel film, an easy-peel film formed from the composition, and a method for manufacturing the same.

In the past, products with excellent adhesive strength have been in the limelight for food packaging film products, but recently, as the demand for instant foods such as convenience foods increases, the aspect of easy opening is emphasized. As part of this, the easy-to-open Easy-Peel film appeared.

In general, easy-peel films are characterized in that adhesive strength is controlled by appropriate distribution of compatibility-incompatibility characteristics between a substrate and a film to be bonded composed of polymers having different compatibility. At this time, the selection and mixing ratio of the polymer used can be said to be a key technology that determines the characteristics of the easy-peel. If the mixing ratio is not right, the strength may be too high or too low, and the product may not be packaged properly. In other words, if the adhesive strength of the easy-peel film is too low, the contents may come out due to shaking or shock during movement or transportation of the product. There may be.

In general, in order to obtain easy-peel properties for a polyolefin (PE or PP) substrate, a compatible-incompatible blend resin with polyolefin is used so that the compatible resin can adhere to the polyolefin substrate, and the incompatible resin can easily adhere to the polyolefin substrate. make peeling possible.

Meanwhile, in order to obtain easy-peel properties for a polyester-based (PET) substrate, a compounding resin including an adhesive resin such as MA-graft polyolefin, EVA, EMA, EBA, or EAA is used as a sealant layer of the easy-peel film. Examples of polyester-based (PET)-based substrates include ice containers for iced coffee used in real life, drinking water containers for airline in-flight meals, and various jelly containers.

KR 2001-0057618 A

In one aspect, an object of the present disclosure is to provide a composition for preparing an easy-peel film capable of low-temperature sealing to a polyester-based substrate and improving sealing strength.

In another aspect, an object of the present disclosure is to provide an easy-peel film including two or more layers formed from the composition for preparing the easy-peel film.

In another aspect, the present disclosure aims to provide a method for manufacturing an easy-peel film comprising the above two or more layers.

In one aspect, the present disclosure provides a base layer composition comprising a polyolefin resin; and an easypeel layer composition comprising a polypropylene resin, an adhesive resin and a polybutylene resin.

In one exemplary embodiment, the polyolefin resin may be a polyethylene resin.

In one exemplary embodiment, the polyolefin resin may be a linear low density polyethylene resin.

In an exemplary embodiment, the polybutylene resin may have a melt index of 3.0 to 5.0 g/10min and a melting temperature of 53 to 105 °C when measured at 230 °C under a load of 2.16 kg.

In one exemplary embodiment, the easy-peel layer composition includes a commercially available easy-peel film resin mainly containing a polypropylene resin and containing an adhesive resin; And it may be one containing a polybutylene resin.

In an exemplary embodiment, the commercially available easy-peel film resin may be a trade name of MODIC ^TM Z051F manufactured by Mitsubishi Chemical Corporation, Tokyo, Japan.

In an exemplary embodiment, the easy-peel layer composition may include 89 to 99.9% by weight of commercially available easy-peel film resin based on the total weight of the easy-peel layer composition.

In an exemplary embodiment, the easy-peel layer composition may contain 0.1 to 11% by weight of polybutylene resin based on the total weight of the easy-peel layer composition.

In another aspect, the present disclosure provides an easy-peel film including two or more layers formed from the composition for preparing the two-component easy-peel film, the base layer formed from a base layer composition including a polyolefin resin; and an easy-peel layer formed from an easy-peel layer composition containing a polypropylene resin, an adhesive resin, and a polybutylene resin.

In an exemplary embodiment, the base layer and the easy peel layer may each have a thickness of 20 to 30 μm.

In an exemplary embodiment, the easy-peel film may seal with an adhesive force of 400 to 1100 gf/15 mm to a polyester-based substrate at 150 to 200 °C.

In another aspect, the present disclosure provides a method for manufacturing an easy-peel film including the two or more layers, the base layer formed from a base layer composition including a polyolefin resin; and preparing an easy-peel film comprising two or more layers including an easy-peel layer formed from an easy-peel layer composition comprising a polypropylene resin, an adhesive resin, and a polybutylene resin. A method for manufacturing an easy-peel film is provided.

In an exemplary embodiment, the method may be to prepare an easy-peel film including two or more layers using a co-extruder.

In one aspect, the technology disclosed in the present disclosure has an effect of providing a composition for preparing an easy-peel film capable of low-temperature sealing to a polyester-based substrate and improving sealing strength.

In another aspect, the technology disclosed in the present disclosure has an effect of providing an easy-peel film including two or more layers formed from the composition for preparing the easy-peel film.

In another aspect, the technology disclosed in the present disclosure has an effect of providing a method for manufacturing an easy-peel film including the two or more layers.

Hereinafter, the present disclosure will be described in detail.

In one aspect, the present disclosure provides a base layer composition comprising a polyolefin resin; and an easypeel layer composition comprising a polypropylene resin, an adhesive resin and a polybutylene resin.

The composition for producing a two-component easy-peel film provides an easy-peel film including two layers: a base layer formed from a base layer composition and an easy-peel layer formed from the easy-peel layer composition, wherein the easy-peel film includes a polyester-based substrate such as PET. Low-temperature sealing is possible on sheets or PET containers, and the effect of improved sealing strength is provided.

When the easy-peel film is formed as a single layer by compounding the polyolefin resin, the polypropylene resin, the adhesive resin, and the polybutylene resin into one non-two-component composition, the polyester substrate is not sealed. Therefore, a composition for preparing an easy-peel film for having easy-peel properties for a polyester-based substrate includes a base layer composition containing a polyolefin resin as described above; and an easy-to-peel layer composition containing a polypropylene resin, an adhesive resin, and a polybutylene resin.

In addition, when the polybutylene resin is compounded with a polyethylene resin other than the polypropylene resin in the easy-peel layer composition, the compatibility is good, but the heat resistance of the easy-peel film is deteriorated by the polyethylene resin, and the polybutylene resin is polystyrene instead of the polypropylene resin. In the case of compounding with a resin, since the ductility of the easy-peel film is poor due to the basic rigidity of polystyrene, it is preferable to compound the polybutylene resin with the polypropylene resin in the easy-peel layer composition.

In one exemplary embodiment, the polyolefin resin may be a polyethylene resin.

In one exemplary embodiment, the polyolefin resin may be a linear low density polyethylene resin.

In an exemplary embodiment, the adhesive resin is ionomer, maleic anhydride grafted polyolefin, ethylene vinyl acetate (EVA), ethylene butyl acetate (EBA), ethylene methyl acetate (EMA) and ethylene acrylic acid (EAA). It can be used by appropriately selecting those known in the art.

In an exemplary embodiment, the polybutylene resin may have a melt index of 3.0 to 5.0 g/10min and a melting temperature of 53 to 105 °C when measured at 230 °C under a load of 2.16 kg.

In an exemplary embodiment, the polybutylene resin may be prepared according to the method described in Korean Patent Registration No. 10-1924121, the entire contents of which are incorporated herein by reference.

In an exemplary embodiment, the polybutylene resin is a monomer molar ratio (X) such that the DSC melting point (Y) calculated by Equation 1 below satisfies the range of 53 to 105 ° C. 1-butene unit part and propylene unit As the copolymer containing moieties, it may be a 1-butene-based copolymer having improved elongation at break, tensile strength at break, and modulus of elasticity at break compared to homopolybutene-1.

[Equation 1]

Y = 199.9X ² - 238.5X + 123.4

(In Equation 1, X represents the monomer molar ratio of propylene/1-butene, and Y represents the DSC melting point (° C.))

In an exemplary embodiment, the polybutylene resin is a 1- It may be a 1-butene-based copolymer prepared by bulk polymerization of 60 to 92 mol% of butene and 8 to 40 mol% of propylene. The (A) Ziegler-Natta type main catalyst has a Ti content in the range of 0.1 to 10 ppm based on the total weight of the propylene/1-butene monomer, and the (B) aluminum-based cocatalyst has a Ti content relative to It is included in the range of 50 to 500 molar ratio, and the (C) silane-based cocatalyst is included in the range of 1 to 100 molar ratio relative to the Ti content, and the (B) aluminum-based cocatalyst and the (C) silane-based cocatalyst are ( The molar ratio of B)/(C) is maintained in the range of 5 to 18.

In an exemplary embodiment, the polybutylene resin contains 60 to 92 mol% of units derived from 1-butene and 8 to 40 mol% of units derived from propylene, has a DSC melting point of 53 to 105 ° C, and breaks It may be a 1-butene-based copolymer having an elongation of 400 to 800%, a tensile strength at break of 400 to 500 kgf/cm 2 , and an elastic modulus at break of 2000 to 3500 kgf/cm 2 .

In one exemplary embodiment, the easy-peel layer composition includes a commercially available easy-peel film resin mainly containing a polypropylene resin and containing an adhesive resin; And it may be one containing a polybutylene resin.

In the present application, the commercialized easy-peel film resin refers to a resin for easy-peel films that is commercialized in the art, and refers to a resin for easy-peel films in which a polypropylene resin is mainly used and an adhesive resin is compounded.

In an exemplary embodiment, the commercially available easy-peel film resin may be a trade name of MODIC ^TM Z051F manufactured by Mitsubishi Chemical Corporation, Tokyo, Japan. When the commercialized easy-peel film resin is blended with a polybutylene resin, the easy-peel property is further improved.

The MODIC ^TM Z051F has a melt flow rate (MFR) of 2.4 g/10 min under a load of 190 °C and 21.2 N when measured according to ISO R-1133, a density of 0.93 g/cm ³ when measured according to ISO R-1133, and a density of 100 Melting point in °C, Tensile Strength at break measured according to ISO R-527 of 7 MPa, Tensile Elongation at break greater than 500% measured according to ISO R-527 .

In an exemplary embodiment, the easy-peel layer composition may include 89 to 99.9% by weight of commercially available easy-peel film resin based on the total weight of the easy-peel layer composition. In another exemplary embodiment, the easy-peel layer composition contains 89% by weight or more, 90% by weight or more, 91% by weight or more, 92% by weight or more, 93% by weight or more, or 94% by weight or more based on the total weight of the easy-peel layer composition. , 95% by weight or more, 96% by weight or more, 97% by weight or more, 98% by weight or more or 99% by weight or more, and 99.9% by weight or less, 99% by weight or less, 98% by weight or less, 97% by weight or less, 96% by weight Hereinafter, the commercially available easy-peel film resin may be included in an amount of 95% by weight or less, 94% by weight or less, 93% by weight or less, 92% by weight or less, or 91% by weight or less.

In an exemplary embodiment, the easy-peel layer composition may preferably contain 95 to 99% by weight of a commercially available easy-peel film resin based on the total weight of the easy-peel layer composition.

In an exemplary embodiment, the easy-peel layer composition may contain 0.1 to 11% by weight of polybutylene resin based on the total weight of the easy-peel layer composition. In another exemplary embodiment, the easy-peel layer composition is present in an amount of 0.1% by weight or more, 1% by weight or more, 2% by weight or more, 3% by weight or more, 4% by weight or more, or 5% by weight or more based on the total weight of the easy-peel layer composition. , 6 wt% or more, 7 wt% or more, 8 wt% or more, 9 wt% or more or 10 wt% or more, and 11 wt% or less, 10 wt% or less, 9 wt% or less, 8 wt% or less, 7 wt% Or less, 6 wt% or less, 5 wt% or less, 4 wt% or less, 3 wt% or less, 2 wt% or less, or 1 wt% or less may include the polybutylene resin.

In an exemplary embodiment, the easy-peel layer composition may preferably contain 1 to 5% by weight of polybutylene resin based on the total weight of the easy-peel layer composition.

In an exemplary embodiment, the easy-peel layer composition may include 0.2 to 0.5 parts by weight of an additive based on 100 parts by weight of the total ease-peel layer composition.

In an exemplary embodiment, the additive may include a heat-resistant stabilizer, an antioxidant, a catalyst neutralizer, a reinforcing agent, a filler, a weathering stabilizer, an antistatic agent, a lubricant, a slip agent, a nucleating agent, a flame retardant, a pigment, a dye, and the like, and preferably may contain an anti-blocking agent to prevent blocking between films due to the adhesive resin.

In another aspect, the present disclosure provides an easy-peel film including two or more layers formed from the composition for preparing the two-component easy-peel film, the base layer formed from a base layer composition including a polyolefin resin; and an easy-peel layer formed from an easy-peel layer composition containing a polypropylene resin, an adhesive resin, and a polybutylene resin.

In an exemplary embodiment, the base layer and the easy peel layer may each have a thickness of 20 to 30 μm. In an exemplary embodiment, each of the base layer and the easy-peel layer has a thickness of 20 μm or more, 22 μm or more, 24 μm or more, 26 μm or more, or 28 μm or more, and 30 μm or less, 28 μm or less, 26 μm or less, or 24 μm or less, respectively. It may have a thickness of less than or equal to 22 μm.

In an exemplary embodiment, each of the base layer and the easy-peel layer may have a thickness of 24 to 26 μm.

In an exemplary embodiment, the easy-peel film may include a base layer and an easy-peel layer and have a thickness of 45 to 55 μm, 47 to 53 μm, or 49 to 51 μm.

In an exemplary embodiment, the easy-peel film may have improved sealing strength with a polyester-based substrate. Therefore, the easy-peel film is suitable for use in packaging food containers based on polyester.

In the conventional composition for preparing an easy-peel film for imparting easy-peel properties to a polyester-based substrate, excessive pressure is applied during film extrusion due to the sticky property of the adhesive resin or blocking often occurs after film production. On the other hand, the composition for producing an easy-peel film according to the present disclosure can relieve excessive pressure during film extrusion and prevent blocking from occurring after film production.

In an exemplary embodiment, the easy-peel film may seal with an adhesive force of 400 to 1100 gf/15 mm to a polyester-based substrate at 150 to 200 °C.

In another aspect, the present disclosure provides a method for manufacturing an easy-peel film including the two or more layers, the base layer formed from a base layer composition including a polyolefin resin; and preparing an easy-peel film comprising two or more layers including an easy-peel layer formed from an easy-peel layer composition comprising a polypropylene resin, an adhesive resin, and a polybutylene resin. A method for manufacturing an easy-peel film is provided.

In an exemplary embodiment, the method may be to prepare an easy-peel film including two or more layers using a co-extruder.

In an exemplary embodiment, the easy-peel film is a film extruded by an extrusion process of three extrusion zones of 150 ° C, 155 ° C, and 165 ° C and three T-Die zones of 165 ° C, 165 ° C, and 180 ° C It may be manufactured through room temperature cooling.

Hereinafter, the present disclosure will be described in more detail through examples. These examples are only for exemplifying the present disclosure, and it will be apparent to those skilled in the art that the scope of the present disclosure is not to be construed as being limited by these examples.

Example 1.

An easy-peel film having two layers, a base layer and an easy-peel layer, was manufactured using a 2-layer blown type coextrusion facility. The first extruder uses polyolefin resin (Hanwha Chemical LLDPE 4200) to form a base layer with a thickness of 25 μm, and the second extruder mainly contains polypropylene resin and contains 89.6% by weight of commercially available easy-peel film resin containing an adhesive resin. (Mitsubishi Chemical Co., Ltd. MODIC ^TM Z051F), 10 wt% of polybutylene resin (PB, Ilem Technology Co., Ltd.) and 0.4 wt% of antiblocking agent were used to form an easy-peel layer with a thickness of 25 μm, but the temperature condition of the extruder was 180 ° C. Thus, an easy-peel film was prepared.

Example 2.

An easy-peel film was prepared in the same manner as in Example 1, but in the second extruder, the easy-peel layer composition was composed of 98.6% by weight of a commercialized easy-peel film resin, 1% by weight of a polybutylene resin, and 0.4% by weight of an antiblocking agent to have a thickness of 25 μm. An easy-peel film was prepared by forming an easy-peel layer of.

Example 3.

An easy-peel film was prepared in the same manner as in Example 1, but in the second extruder, the easy-peel layer composition was composed of 94.6% by weight of a commercialized easy-peel film resin, 5% by weight of a polybutylene resin, and 0.4% by weight of an antiblocking agent to have a thickness of 25 μm. An easy-peel film was prepared by forming an easy-peel layer of.

comparative example One.

An easy-peel film was prepared in the same manner as in Example 1, but a polyethylene resin (PE, DOW Chemical) was used instead of the polybutylene resin in the second extruder.

Comparative Example 2.

An easy-peel film was prepared in the same manner as in Example 1, but a polystyrene resin (PS, Kumho Petrochemical) was used instead of the polybutylene resin in the second extruder.

comparative example 3.

An easy-peel film was prepared in the same manner as in Example 1, but in the second extruder, without using a polybutylene resin, 99.6% by weight of a commercialized easy-peel film resin and 0.4% by weight of an anti-blocking agent were used to form an easy-peel layer composition to have a thickness of 25 μm. An easy-peel film was prepared by forming an easy-peel layer of.

Experimental example One.

Using the easy-peel films prepared in Examples 1 to 3 and Comparative Examples 1 to 3, the 250 μm PET sheet (Jinyoung Chemical) and the easy-peel layer of the easy-peel film were brought face to face at temperatures of 160, 170, and 180 ° C. for 1 s, After heat-sealing at 0.2 MPa, the sample was sampled with a width of 15 mm, and the sealing strength (adhesive force) when peeled at a speed of 200 m/min was measured using a tensile tester (SHIMADZU TCE-N300) at room temperature. 1 and 2 are shown.

division Adhesion (gf/15mm) 160℃ 170℃ 180℃ Example 1 500 540 550 Comparative Example 1 200 210 210 Comparative Example 2 176 184 190 Comparative Example 3 150 340 400

It was confirmed that the easy-peel films of Example 1 and Comparative Example 3 had adhesive strength of 340 gf/15mm or more to the polyester-based substrate and thus had sealing strength usable for the polyester-based substrate. In the easy-peel film of Example 1, sealing is possible at a lower temperature by forming an easy-peel layer by compounding a polybutylene resin in a commercially available easy-peel film resin containing a polypropylene resin as a main material and compounding an adhesive resin. It was confirmed that the sealing strength of the easy-peel film can be further improved. The polybutylene resin also had excellent compatibility with the commercially available easy-peel film resin when compounded.

On the other hand, in the case of the easy-peel films of Comparative Examples 1 and 2 in which a polyolefin resin such as polyethylene or polystyrene is compounded in a commercially available easy-peel film resin containing a polypropylene resin as a main material and compounding an adhesive resin, a polyester-based substrate It was confirmed that the sealing strength was lowered. The easy-peel film of Comparative Example 1 using a polyethylene resin was capable of sealing at a low temperature, but had low sealing strength, and the easy-peel film of Comparative Example 2 using a polystyrene resin showed poor film ductility during film extrusion. In addition, it was confirmed that the easy-peel film of Comparative Example 1 using a polyethylene resin had poor film transparency, whereas the easy-peel film of Example 1 using a polybutylene resin did not have a film transparency.

division Adhesion (gf/15mm) 160℃ 170℃ 180℃ Example 1 500 540 550 Example 2 600 700 770 Example 3 600 800 1000

In addition, as a result of comparing the sealing strength according to the polybutylene resin content in the easy-peel layer, when low-temperature sealing is performed at 150 to 200 ° C. for a polyester-based substrate, the adhesive resin is composed of a polypropylene resin as a main component. It was confirmed that the easy-peel film including the easy-peel layer in which the polybutylene resin was compounded in an amount of 1 to 5% by weight to the commercially available easy-peel film resin that was pounded showed excellent sealing strength.

As above, specific parts of the present disclosure have been described in detail, and for those skilled in the art, it is clear that these specific descriptions are only preferred embodiments, and the scope of the present disclosure is not limited thereby. something to do. Accordingly, the substantial scope of the disclosure will be defined by the appended claims and their equivalents.

Claims (13)

A base layer composition comprising a polyolefin resin; and
Including an easypeel layer composition comprising a polypropylene resin, an adhesive resin and a polybutylene resin,
The easy-peel layer composition includes a commercially available easy-peel film resin containing a polypropylene resin as a main material and containing an adhesive resin; and a polybutylene resin;
The easy-peel layer composition comprises 0.1 to 11% by weight of a polybutylene resin based on the total weight of the easy-peel layer composition.
According to claim 1,
The polyolefin resin is a polyethylene resin, a composition for preparing a two-component easy-peel film.
According to claim 1,
The polyolefin resin is a linear low-density polyethylene resin, a composition for preparing a two-component easy-peel film.
According to claim 1,
The polybutylene resin has a melt index of 3.0 to 5.0 g/10min and a melting temperature of 53 to 105 °C when measured at 230 ° C. with a load of 2.16 kg.
delete delete According to claim 1,
The easy-peel layer composition comprises 89 to 99.9% by weight of a commercially available easy-peel film resin based on the total weight of the easy-peel layer composition.
According to claim 1,
The easy-peel layer composition comprises 1 to 5% by weight of a polybutylene resin based on the total weight of the easy-peel layer composition.
An easy-peel film comprising two or more layers formed from the composition for preparing a two-component easy-peel film according to any one of claims 1 to 4, 7 and 8,
A base layer formed from a base layer composition containing a polyolefin resin; and
An easy-to-peel layer formed from an easy-to-peel layer composition containing a polypropylene resin, an adhesive resin, and a polybutylene resin,
The easy-peel layer composition includes a commercially available easy-peel film resin containing a polypropylene resin as a main material and containing an adhesive resin; and a polybutylene resin;
The easy-peel layer composition comprises 0.1 to 11% by weight of a polybutylene resin based on the total weight of the easy-peel layer composition.
According to claim 9,
The easy-peel film comprising two or more layers, wherein the base layer and the easy-peel layer each have a thickness of 20 to 30 μm.
According to claim 9,
The easy-peel film is an easy-peel film comprising two or more layers, which seals with an adhesive strength of 400 to 1100 gf / 15mm to a polyester-based substrate at 150 to 200 ° C.
A method for producing an easy-peel film comprising two or more layers according to claim 9,
A base layer formed from a base layer composition containing a polyolefin resin; and preparing an easy-peel film comprising two or more layers including an easy-peel layer formed from an easy-peel layer composition including a polypropylene resin, an adhesive resin, and a polybutylene resin,
The easy-peel layer composition includes a commercially available easy-peel film resin containing a polypropylene resin as a main material and containing an adhesive resin; and a polybutylene resin;
The method of manufacturing an easy-peel film comprising two or more layers, wherein the easy-peel layer composition contains 0.1 to 11% by weight of a polybutylene resin based on the total weight of the easy-peel layer composition.
According to claim 12,
The method of manufacturing an easy-peel film comprising two or more layers, wherein the method comprises manufacturing an easy-peel film comprising two or more layers with a co-extruder.