JP6086329B2 - Barrier film and laminate using the same - Google Patents

Description

  The present invention relates to a barrier film having a base layer composed of a biomass polyester resin composition obtained from a plant-derived raw material and a laminate using the same, and more specifically, biomass-derived ethylene glycol as a diol component It is related with the barrier film which has a base material layer which consists of a resin composition containing used polyester, and a layered product using the same.

  Polyesters are widely used in various industrial applications because they are excellent in mechanical properties, chemical stability, heat resistance, transparency and the like and are inexpensive. Polyester is obtained by polycondensation of a diol unit and a dicarboxylic acid unit. For example, polyethylene terephthalate (hereinafter sometimes abbreviated as PET) is obtained by esterifying ethylene glycol and terephthalic acid as raw materials. After the polycondensation reaction. These raw materials are produced from petroleum, which is a fossil resource, for example, ethylene glycol is produced industrially from ethylene and terephthalic acid is produced industrially from xylene.

  In recent years, with the growing demand for the establishment of a recycling-oriented society, the use of biomass has been attracting attention in the materials field, as it is desired to move away from fossil fuels as well as energy. Biomass is an organic compound photo-synthesized from carbon dioxide and water, and by using it, it is so-called carbon neutral renewable energy that becomes carbon dioxide and water again. In recent years, biomass plastics using these biomass as raw materials have been rapidly put into practical use, and attempts have been made to produce polyester, which is a general-purpose polymer material, from these biomass raw materials.

  For example, as a polyester using a biomass material, a polyester composed of isosorbide, terephthalic acid and ethylene glycol, which is one of biomass materials, has been proposed (Patent Document 1).

  Biomass ethanol obtained by fermenting starch and saccharides obtained from plants such as corn and sugarcane with microorganisms has been put into practical use, and ethylene glycol is industrially produced from this biomass ethanol via ethylene. Has also succeeded.

Special table 2002-512304 gazette

  The present inventors pay attention to ethylene glycol, which is a raw material of polyester, and instead of ethylene glycol obtained from conventional fossil fuel, polyester using plant-derived ethylene glycol as its raw material is obtained from conventional fossil fuel. The inventors obtained knowledge that polyesters produced using ethylene glycol and those inferior in physical properties such as mechanical properties can be obtained. Furthermore, a barrier film having a base material layer made of such biomass-derived polyester and a laminate using the same are also used as a barrier film having a base material layer made of a raw material obtained from a conventional fossil fuel. It was found that a laminated body and a product that is inferior in physical properties such as mechanical properties can be obtained. The present invention is based on this finding.

  Accordingly, an object of the present invention is to provide a barrier film having a base material layer made of a resin composition containing carbon neutral polyester using biomass ethylene glycol, from a raw material obtained from a conventional fossil fuel. It is intended to provide a barrier film having a base material layer comprising a manufactured barrier film having a base material layer and a polyester resin film that is inferior in physical properties such as mechanical properties. Another object of the present invention is to provide a laminate using the barrier film.

The barrier film according to the present invention has a base material layer and a vapor deposition layer formed on at least one surface of the base material layer,
The base material layer is composed of a resin composition comprising a polyester composed of a diol unit and a dicarboxylic acid unit as a main component, the resin composition is ethylene glycol derived from biomass, and the dicarboxylic acid unit is a dicarboxylic acid unit. The polyester which is a dicarboxylic acid derived from fossil fuel comprises 50 to 95% by mass with respect to the entire resin composition,
The vapor deposition layer is composed of a vapor deposition film of an inorganic substance or an inorganic oxide.

  In an embodiment of the present invention, the resin composition is a recycled resin product comprising a polyester in which the diol unit is a diol derived from fossil fuel or ethylene glycol derived from biomass, and the dicarboxylic acid unit is a dicarboxylic acid derived from fossil fuel. It is preferable that the polyester further obtained is obtained.

  In the aspect of this invention, it is preferable that the said resin composition contains 5-45 mass% of polyester obtained by the said recycling with respect to the whole resin composition.

  In the embodiment of the present invention, the dicarboxylic acid derived from the fossil fuel is preferably terephthalic acid.

  In the embodiment of the present invention, it is preferable that the resin composition further comprises an additive.

  In the aspect of this invention, it is preferable to contain the said additive 5-50 mass% with respect to the whole resin composition.

  In an aspect of the present invention, the additive is a plasticizer, an ultraviolet stabilizer, a coloring inhibitor, a matting agent, a deodorant, a flame retardant, a weathering agent, an antistatic agent, a yarn friction reducing agent, a release agent. It is preferable that it is 1 type, or 2 or more selected from the group which consists of an antioxidant, an ion exchanger, and a coloring pigment.

  In the aspect of this invention, it is preferable that content of the carbon derived from biomass by a radioactive carbon (C14) measurement is 10-19% with respect to all the carbon in the said polyester.

  In the aspect of the present invention, the base material layer is preferably a resin film formed by biaxial stretching.

  In the aspect of the present invention, the vapor deposition layer is preferably composed of a vapor deposition film formed by physical vapor deposition or chemical vapor deposition.

  In the aspect of the present invention, the vapor deposition layer is preferably made of a vapor deposition film of aluminum, aluminum oxide, or silicon oxide.

  In the aspect of this invention, it is preferable that it is a laminated body using the said barrier film.

  In the aspect of this invention, it is preferable that a laminated body is a laminated film or a packaging bag.

  According to the present invention, in the barrier film having a base material layer and a vapor deposition layer formed on at least one surface of the base material layer, the base material layer is mainly composed of a polyester composed of a diol unit and a dicarboxylic acid unit. A resin composition comprising a component, wherein the resin composition is a polyester in which the diol unit is biomass-derived ethylene glycol and the dicarboxylic acid unit is a fossil fuel-derived dicarboxylic acid, based on the entire resin composition 50-95 mass%, and the vapor deposition layer consists of a vapor deposition film of an inorganic substance or an inorganic oxide, and can implement | achieve the barrier film which has the base material layer which consists of carbon neutral resin. Therefore, the amount of fossil fuel used can be greatly reduced compared to the conventional case, and the environmental load can be reduced. Further, the barrier film of the polyester resin composition of the present invention is inferior in terms of physical properties such as mechanical properties as compared with the barrier film of the polyester resin composition produced from a raw material obtained from a conventional fossil fuel. Since the polyester resin composition is used, the barrier film of the conventional polyester resin composition can be substituted.

It is a schematic cross section which shows an example of the laminated body using the barrier film by this invention. It is a schematic cross section which shows an example of the laminated body using the barrier film by this invention.

<Barrier film>
In the barrier film according to the present invention, the base material layer is composed of a resin composition containing, as a main component, a polyester composed of a diol unit and a dicarboxylic acid unit, and the resin composition is an ethylene glycol having a diol unit derived from biomass. And a carbon neutral polyester resin comprising 50 to 95% by weight, preferably 50 to 90% by weight, of the polyester whose dicarboxylic acid unit is a dicarboxylic acid derived from fossil fuel, based on the whole resin composition. A barrier film having a base material layer made of can be realized. Biomass-derived ethylene glycol has the same chemical structure as conventional fossil fuel-derived ethylene glycol. Therefore, polyester using biomass-derived ethylene glycol is not a polyester polymerized from a conventional fossil fuel-derived raw material. Therefore, the base material layer of the barrier film of the present invention is not inferior to the conventional polyester film in terms of physical properties such as mechanical properties. Therefore, since the barrier film of the present invention and the laminate using the same have a layer made of a carbon neutral material, the barrier film produced from a raw material obtained from a conventional fossil fuel and the laminate using the same Compared with, the amount of fossil fuel used can be greatly reduced, and the environmental load can be reduced. Moreover, according to a preferable aspect, the laminate may further include a resin layer.

  According to one embodiment of the present invention, a laminate including a base material layer, a vapor deposition layer, and a resin layer and using a barrier film is provided. Specifically, a schematic cross-sectional view of an example of a laminate using the barrier film according to the present invention is shown in FIG. A laminate 10 shown in FIG. 1 includes a base material layer 11, a vapor deposition layer 12 formed on one surface of the base material layer 11, and a resin layer 13 on which a printing layer 15 is formed. The vapor deposition surface of the base material layer 11 and the printing surface of the resin layer 13 are bonded via an adhesive layer 14. Moreover, the resin layer 16 is bonded via the adhesive layer 14 on the other surface (surface opposite to the vapor deposition layer) of the base material layer 11.

  According to one embodiment of the present invention, a laminate including a base material layer, a vapor deposition layer, and a resin layer and using a barrier film is provided. Specifically, FIG. 2 shows a schematic sectional view of an example of a laminate using the barrier film according to the present invention. The laminate 20 shown in FIG. 2 includes a base material layer 21, a vapor deposition layer 22 formed on one surface of the base material layer 21, and a resin layer 23. The surface and the resin layer 23 are bonded through an adhesive layer 24. Furthermore, the resin layer 25 is bonded onto the resin layer 23 via the adhesive layer 24. Hereinafter, each layer structure of this invention is demonstrated.

<Base material layer>
In this invention, a base material layer consists of a resin composition which contains the polyester demonstrated below as a main component.

<Polyester>
The polyester contained in the resin composition forming the base material layer is composed of a diol unit and a dicarboxylic acid unit, using biomass-derived ethylene glycol as the diol unit, and using dicarboxylic acid derived from fossil fuel as the dicarboxylic acid unit. It is obtained by a polycondensation reaction.

  Biomass-derived ethylene glycol uses ethanol (biomass ethanol) produced from biomass as a raw material. For example, biomass-derived ethylene glycol can be obtained from biomass ethanol by a conventionally known method, such as a method of producing ethylene glycol via ethylene oxide. Moreover, you may use commercially available biomass ethylene glycol, for example, the biomass ethylene glycol marketed from India Glycol can be used conveniently.

  The dicarboxylic acid unit of the polyester uses a dicarboxylic acid derived from fossil fuel. As the dicarboxylic acid, aromatic dicarboxylic acid, aliphatic dicarboxylic acid, and derivatives thereof can be used without limitation. Examples of the aromatic dicarboxylic acid include terephthalic acid and isophthalic acid, and examples of the aromatic dicarboxylic acid derivative include lower alkyl esters of aromatic dicarboxylic acid, specifically methyl ester, ethyl ester, propyl ester, and butyl. Examples include esters. Among these, terephthalic acid is preferable, and dimethyl terephthalate is preferable as an aromatic dicarboxylic acid derivative.

  Specific examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, and cyclohexanedicarboxylic acid. And a chain or alicyclic dicarboxylic acid. Examples of the aliphatic dicarboxylic acid derivative include lower alkyl esters such as methyl ester, ethyl ester, propyl ester and butyl ester of aliphatic dicarboxylic acid, and cyclic acid anhydrides of aliphatic dicarboxylic acid such as succinic anhydride. Can be mentioned. Among these, adipic acid, succinic acid, dimer acid or a mixture thereof is preferable, and succinic acid as the main component is particularly preferable. As the derivative of the aliphatic dicarboxylic acid, methyl esters of adipic acid and succinic acid, or a mixture thereof are more preferable.

  These dicarboxylic acids can be used alone or in combination of two or more.

  The polyester contained in the resin composition forming the base material layer may be a copolymer polyester obtained by adding a copolymer component as a third component in addition to the diol component and the dicarboxylic acid component. Specific examples of the copolymer component include a bifunctional oxycarboxylic acid, a trifunctional or higher polyhydric alcohol, a trifunctional or higher polyvalent carboxylic acid and / or an anhydride thereof, and 3 Examples include at least one polyfunctional compound selected from the group consisting of functional or higher oxycarboxylic acids. Among these copolymer components, a bifunctional and / or trifunctional or higher functional oxycarboxylic acid is particularly preferably used because a copolymer polyester having a high degree of polymerization tends to be easily produced. Among them, the use of a tri- or higher functional oxycarboxylic acid is most preferable because a polyester having a high degree of polymerization can be easily produced with a very small amount without using a chain extender described later.

  The polyester may be a high molecular weight polyester obtained by chain extending (coupling) these copolyesters. As the chain extender, a chain extender such as a carbonate compound or a diisocyanate compound can also be used. However, the amount of the chain extender is usually 100% by mole of all monomer units constituting the polyester, and a carbonate bond and a urethane bond. Usually, it is 10 mol% or less, preferably 5 mol% or less, more preferably 3 mol% or less.

  Specific examples of the carbonate compound include diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, ethylene carbonate, diamyl carbonate, and dicyclohexyl. Examples include carbonate. In addition, carbonate compounds composed of the same or different hydroxy compounds derived from hydroxy compounds such as phenols and alcohols can be used.

  Specific examples of the diisocyanate compound include 2,4-tolylene diisocyanate, a mixture of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and xylylene. Known diisocyanates such as range isocyanate, hydrogenated xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate can be used.

  The polyester forming the base material layer can be obtained by a conventionally known method in which the above-described diol unit and dicarboxylic acid unit are polycondensed. Specifically, after performing the esterification reaction and / or transesterification reaction of the dicarboxylic acid component and the diol component, a general method of melt polymerization such as a polycondensation reaction under reduced pressure, or an organic solvent It can be produced by a known solution heating dehydration condensation method using

  The amount of the diol used in producing the polyester is substantially equimolar with respect to 100 mol of the dicarboxylic acid or derivative thereof, but in general, during the esterification and / or transesterification reaction and / or the condensation polymerization reaction. Is used in excess of 0.1 to 20 mol%.

  The polycondensation reaction is preferably performed in the presence of a polymerization catalyst. The addition timing of the polymerization catalyst is not particularly limited as long as it is before the polycondensation reaction, and it may be added when the raw materials are charged, or may be added at the start of pressure reduction.

  Examples of the polymerization catalyst include compounds containing a Group 1 to Group 14 metal element excluding hydrogen and carbon in the periodic table. Specifically, at least one metal selected from the group consisting of titanium, zirconium, tin, antimony, cerium, germanium, zinc, cobalt, manganese, iron, aluminum, magnesium, calcium, strontium, sodium, and potassium. And compounds containing an organic group such as carboxylate, alkoxy salt, organic sulfonate, or β-diketonate salt, and inorganic compounds such as metal oxides and halides described above, and mixtures thereof. Of these, metal compounds containing titanium, zirconium, germanium, zinc, aluminum, magnesium and calcium, and mixtures thereof are preferred, and titanium compounds, zirconium compounds and germanium compounds are particularly preferred. In addition, the catalyst is preferably a compound that is liquid at the time of polymerization or that dissolves in an ester low polymer or polyester because the polymerization rate increases when it is melted or dissolved at the time of polymerization.

  The titanium compound is preferably a tetraalkyl titanate, specifically, tetra-n-propyl titanate, tetraisopropyl titanate, tetra-n-butyl titanate, tetra-t-butyl titanate, tetraphenyl titanate, tetracyclohexyl titanate, tetra Examples include benzyl titanate and mixed titanates thereof. In addition, titanium (oxy) acetylacetonate, titanium tetraacetylacetonate, titanium (diisoproxide) acetylacetonate, titanium bis (ammonium lactate) dihydroxide, titanium bis (ethylacetoacetate) diisopropoxide, titanium (triethanolaminate) ) Isopropoxide, polyhydroxytitanium stearate, titanium lactate, titanium triethanolamate, butyl titanate dimer and the like are also preferably used. Furthermore, titanium oxide and composite oxides containing titanium and silicon are also preferably used. Among these, tetra-n-propyl titanate, tetraisopropyl titanate and tetra-n-butyl titanate, titanium (oxy) acetylacetonate, titanium tetraacetylacetonate, titanium bis (ammonium lactate) dihydroxide, polyhydroxytitanium stearate , Titanium lactate, butyl titanate dimer, titanium oxide, titania / silica composite oxide (for example, product name: C-94 manufactured by Acordis Industrial Fibers), particularly tetra-n-butyl titanate, polyhydroxy titanium stearate , Titanium (oxy) acetylacetonate, titanium tetraacetylacetonate, titania / silica composite oxide (for example, Acordis Industrial Fiber) The product name manufactured by s company: C-94) is preferable.

  Specific examples of the zirconium compound include zirconium tetraacetate, zirconium acetylate hydroxide, zirconium tris (butoxy) stearate, zirconyl diacetate, zirconium oxalate, zirconyl oxalate, potassium potassium oxalate, and polyhydroxyzirconium. Examples include stearate, zirconium ethoxide, zirconium tetra-n-propoxide, zirconium tetraisopropoxide, zirconium tetra-n-butoxide, zirconium tetra-t-butoxide, zirconium tributoxyacetylacetonate and mixtures thereof. Further, zirconium oxide or a complex oxide containing, for example, zirconium and silicon may be used. Among these, zirconyl diacetate, zirconium tris (butoxy) stearate, zirconium tetraacetate, zirconium acetate acetate, zirconium ammonium oxalate, zirconium potassium oxalate, polyhydroxyzirconium stearate, zirconium tetra-n-propoxy Zirconium tetraisopropoxide, zirconium tetra-n-butoxide, and zirconium tetra-t-butoxide are preferred.

  Specific examples of the germanium compound include inorganic germanium compounds such as germanium oxide and germanium chloride, and organic germanium compounds such as tetraalkoxygermanium. In view of price and availability, germanium oxide, tetraethoxygermanium, tetrabutoxygermanium, and the like are preferable, and germanium oxide is particularly preferable.

  The amount of the catalyst used in the case of using a metal compound as these polymerization catalysts, the lower limit is usually 5 ppm or more, preferably 10 ppm or more, and the upper limit is usually 30000 ppm or less, preferably 1000 ppm or less, as the amount of metal relative to the produced polyester. More preferably, it is 250 ppm or less, Especially preferably, it is 130 ppm or less. If too much catalyst is used, it is not only economically disadvantageous but also lowers the thermal stability of the polymer. Conversely, if it is too little, the polymerization activity is lowered, and as a result, the polymer decomposes during polymer production. Is more likely to be triggered. The amount of catalyst used here is a preferred embodiment because the amount of terminal carboxyl groups of the polyester produced is reduced as the amount used is reduced.

  The reaction temperature of the esterification reaction and / or transesterification reaction between the dicarboxylic acid component and the diol component is usually in the range of 150 to 260 ° C., and the reaction atmosphere is usually an inert gas atmosphere such as nitrogen or argon. . Further, the reaction pressure is usually normal pressure to 10 kPa. The reaction time is usually about 1 hour to 10 hours.

  In the production process described above, a chain extender (coupling agent) may be added to the reaction system. After the completion of polycondensation, the chain extender is added to the reaction system without solvent in a uniform molten state and reacted with the polyester obtained by polycondensation.

  High molecular weight polyesters using these chain extenders (coupling agents) can be produced using known techniques. After the completion of polycondensation, the chain extender is added to the reaction system without solvent in a uniform molten state and reacted with the polyester obtained by polycondensation. Specifically, a polyester obtained by catalyzing a diol and a dicarboxylic acid and having a terminal group substantially having a hydroxyl group and a weight average molecular weight (Mw) of 20,000 or more, preferably 40,000 or more. By reacting the chain extender with the prepolymer, a polyester resin having a higher molecular weight can be obtained. If the prepolymer has a mass average molecular weight of 20,000 or more, the use of a small amount of a coupling agent does not affect the remaining catalyst even under severe conditions such as a molten state, so that no gel is formed during the reaction. High molecular weight polyester can be produced.

  The obtained polyester may be solidified after solidification as necessary in order to further increase the degree of polymerization and to remove oligomers such as cyclic trimers. Specifically, after the polyester is made into chips and dried, the polyester is pre-crystallized by heating at a temperature of 100 to 180 ° C. for about 1 to 8 hours, and then inactive at a temperature of 190 to 230 ° C. It is carried out by heating for 1 to several tens of hours under gas flow or under reduced pressure.

  The intrinsic viscosity (measured at 35 ° C. with an orthochlorophenol solution) of the polyester obtained as described above is preferably 0.5 dl / g to 1.5 dl / g, more preferably 0.6 dl / g. g to 1.2 dl / g. When the intrinsic viscosity is less than 0.5 dl / g, mechanical properties required for a polyester film as a transflective film substrate, such as tear strength, may be insufficient. On the other hand, when the intrinsic viscosity exceeds 1.5 dl / g, the productivity in the raw material manufacturing process and the film forming process is impaired.

  Various additives may be added to the manufactured polyester or within the range in which the properties are not impaired, for example, plasticizers, UV stabilizers, anti-coloring agents, and matting agents. Deodorizers, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, mold release agents, antioxidants, ion exchange agents, color pigments, and the like can be added. These additives are added in the range of 5 to 50% by mass, preferably 5 to 20% by mass with respect to the entire polyester resin composition.

  The polyester that may be contained in the resin composition forming the base layer in a proportion of 5 to 45% by mass (hereinafter also referred to as recycled polyester) comprises a diol unit and a dicarboxylic acid unit, and the diol unit is a diol unit. Is a polyester obtained by recycling a product comprising a polyester resin obtained by a polycondensation reaction using a fossil fuel-derived diol or biomass-derived ethylene glycol and using a fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit.

  Resin that is the basis of recycled polyester (that is, polyester resin before recycling) is a biomass polyester as described above, even if both diol units and dicarboxylic acid units are made of raw materials derived from fossil fuels. Also good.

  Examples of the diol derived from fossil fuel used for the resin used as the base of the recycled polyester include aliphatic diols, aromatic diols, and derivatives thereof, and those used as diol units of conventional polyesters are preferably used. be able to. The aliphatic diol is not particularly limited as long as it is an aliphatic and alicyclic compound having two OH groups, but the lower limit of the carbon number is 2 or more, and the upper limit is usually 10 or less, preferably 6 The following aliphatic diols are mentioned. Specific examples include ethylene glycol, 1,3-propylene glycol, neopentyl glycol, 1,6-hexamethylene glycol, decamethylene glycol, 1,4-butanediol and 1,4-cyclohexanedimethanol. It is done. These may be used alone or as a mixture of two or more. Among these, ethylene glycol, 1,4-butanediol, 1,3-propylene glycol and 1,4-cyclohexanedimethanol are preferable, and ethylene glycol is particularly preferable.

It is preferable that the resin composition containing the polyester obtained as described above contains 10 to 19% of the biomass-derived carbon content based on the measurement of radioactive carbon (C14) with respect to the total carbon in the polyester. Since carbon dioxide in the atmosphere contains C14 at a constant ratio (105.5 pMC), the C14 content in plants that grow by incorporating carbon dioxide in the atmosphere, for example, corn, is also about 105.5 pMC. It is known. It is also known that fossil fuel contains almost no C14. Therefore, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 contained in all the carbon atoms in the polyester. In the present invention, in the case where the content of C14 in the polyester and P _C14, the content of P _{bio Bio} carbon from biomass, are defined as follows.
P _bio (%) = P _C14 /105.5×100

Taking polyethylene terephthalate as an example, polyethylene terephthalate is a polymer obtained by polymerizing ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1: 1. Is used, the content P _bio of carbon derived from biomass in the polyester is 20%. In this invention, it is preferable that content of carbon derived from biomass by radioactive carbon (C14) measurement is 10 to 19% with respect to the total carbon in the resin composition. When the carbon content derived from biomass in the resin composition is less than 10%, the effect as a carbon offset material becomes poor. On the other hand, as described above, the biomass-derived carbon content in the resin composition is preferably closer to 20%, but from the viewpoint of problems and physical properties in the production process of the film, the recycled polyester or Since it is preferable to include an additive, the actual upper limit is 18%.

<Resin film>
The base material layer of the barrier film is preferably a polyester resin film made of the above resin composition. In order to process the resin composition into a film, a conventional method of forming a film from a polyester resin can be employed. Specifically, after drying the resin composition described above, the resin composition is supplied to a melt extruder heated to a temperature equal to or higher than the melting point of the polyester (Tm) to Tm + 70 ° C. to melt the resin composition, for example, A film can be formed by extruding into a sheet form from a die such as a T die, and rapidly solidifying the extruded sheet with a rotating cooling drum or the like. As the melt extruder, a single screw extruder, a twin screw extruder, a vent extruder, a tandem extruder, or the like can be used depending on the purpose.

  The base material layer of the barrier film is preferably biaxially stretched. Biaxial stretching can be performed by a conventionally known method. For example, the film extruded onto the cooling drum as described above is subsequently heated by roll heating, infrared heating, or the like, and stretched in the longitudinal direction to obtain a longitudinally stretched film. This stretching is preferably performed by utilizing the difference in peripheral speed between two or more rolls. The longitudinal stretching is usually performed in a temperature range of 50 to 100 ° C. Further, the ratio of the longitudinal stretching is preferably 2.5 times or more and 4.2 times or less, although it depends on the required characteristics of the film application. When the draw ratio is less than 2.5, the thickness unevenness of the polyester film becomes large and it is difficult to obtain a good film.

  The longitudinally stretched film is successively subjected to the transverse stretching, heat setting, and thermal relaxation treatment steps to form a biaxially stretched film. The transverse stretching is usually performed in a temperature range of 50 to 100 ° C. The transverse stretching ratio is preferably 2.5 times or more and 5.0 times or less, although it depends on the required characteristics of this application. If it is less than 2.5 times, the thickness unevenness of the film becomes large and it is difficult to obtain a good film, and if it exceeds 5.0 times, breakage tends to occur during film formation.

  A heat setting treatment is subsequently performed after the transverse stretching, and a preferable temperature range for heat setting is Tg + 70 to Tm-10 ° C. of polyester. The heat setting time is preferably 1 to 60 seconds. Furthermore, for applications that require a low thermal shrinkage rate, heat relaxation treatment may be performed as necessary.

In the resin film obtained as described above, the thickness of the stretched film is arbitrary depending on the application, but is usually about 5 to 500 μm. Breaking strength of such a resin film is 5 to 35 kg / mm ² at 5~40kg / ^mm 2, TD direction MD direction, elongation at break from 50 to 350% in MD direction, the TD direction 50-300%. Further, the shrinkage rate when left in a temperature environment of 150 ° C. for 30 minutes is 0.1 to 5%. Thus, the film which consists of a resin composition by this invention is equivalent to the physical property of the polyester film manufactured only from the material derived from the conventional fossil fuel.

<Deposition layer>
In this invention, a vapor deposition layer consists of a vapor deposition film | membrane of an inorganic substance or an inorganic oxide. A vapor deposition film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and its composition and formation method are not particularly limited. When the barrier film has a vapor deposition layer, gas barrier properties that prevent transmission of oxygen gas, water vapor, and the like and light shielding properties that prevent transmission of visible light, ultraviolet light, and the like can be imparted or improved. The barrier film may have two or more vapor deposition layers. When it has two or more vapor deposition layers, each may have the same composition or different compositions.

  Examples of the deposited film include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), and titanium (Ti). ), Lead (Pb), zirconium (Zr), yttrium (Y) and other inorganic or inorganic oxide vapor deposition films can be used. In particular, an aluminum metal vapor-deposited film or a silicon oxide or aluminum metal or aluminum oxide vapor-deposited film is preferably used as a packaging material (bag) or the like.

Representation of the inorganic oxide, for _example, SiO X, as such AlO _X MO _X (In the formula, M represents an inorganic element, the value of X, varies each of an inorganic element range.) In expressed. As a range of the value of X, silicon (Si) is 0 to 2, aluminum (Al) is 0 to 1.5, magnesium (Mg) is 0 to 1, calcium (Ca) is 0 to 1, 0 to 0.5 for potassium (K), 0 to 2 for tin (Sn), 0 to 0.5 for sodium (Na), 0 to 1,5 for boron (B), titanium (Ti) Can take values in the range of 0 to 2, lead (Pb) in the range of 0 to 1, zirconium (Zr) in the range of 0 to 2, and yttrium (Y) in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are suitably used for the packaging material, silicon (Si) is in the range of 1.0 to 2.0, and aluminum (Al) is in the range of 0.5 to 1.5. Can be used.

  In the present invention, the film thickness of the inorganic or inorganic oxide vapor-deposited film as described above varies depending on the type of inorganic or inorganic oxide used, but is, for example, about 50 to 2000 mm, preferably about 100 to 1000 mm. It is desirable to select and form arbitrarily within the range. More specifically, in the case of an aluminum deposited film, a film thickness of about 50 to 600 mm, more preferably about 100 to 450 mm, is desirable, and in the case of an aluminum oxide or silicon oxide deposited film, The film thickness is about 50 to 500 mm, more preferably about 100 to 300 mm.

  As a method for forming a vapor deposition film, for example, a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method, or a plasma chemical vapor deposition method, thermochemistry Examples thereof include a chemical vapor deposition method (chemical vapor deposition method, CVD method) such as a vapor phase growth method and a photochemical vapor deposition method.

  Hereinafter, the deposited film will be described in more detail as one embodiment of the present invention.

  On one side of the substrate layer (substrate film), vapor deposition monomer gas such as organosilicon compound is used as raw material, inert gas such as argon gas and helium gas is used as carrier gas, and oxygen is supplied An oxygen oxide vapor or the like can be used as a gas, and a vapor deposition film of an inorganic oxide such as silicon oxide can be formed using a low temperature plasma chemical vapor deposition method using a low temperature plasma generator or the like. In the above, as a low temperature plasma generator, generators, such as high frequency plasma, pulse wave plasma, and microwave plasma, can be used, for example. In order to obtain highly active and stable plasma, it is desirable to use a high-frequency plasma generator.

A vapor deposition film of silicon oxide formed using a vapor deposition monomer gas such as an organosilicon compound chemically reacts with a vapor deposition monomer gas such as an organosilicon compound and oxygen gas, and the reaction product is formed on the substrate film. It is closely bonded to the surface to form a dense, flexible thin film, and is usually composed mainly of silicon oxide represented by the general formula SiO _x (where X represents a number from 0 to 2). It is a continuous thin film. The deposited film of the silicon oxide, transparency, from the viewpoint of the barrier property and the like, the general formula SiO _X (provided that, X represents represents. A number of 1.3 to 1.9) of silicon oxide represented by A thin film mainly composed of a deposited film is preferable. In the above, the value of X varies depending on the molar ratio of vapor deposition monomer gas to oxygen gas, plasma energy, etc. Generally, the gas permeability decreases as the value of X decreases, but the film itself is yellow. It becomes sexual and becomes less transparent.

In addition, the silicon oxide vapor-deposited film is mainly composed of silicon oxide, and in addition to this, at least one kind of compound composed of one kind of carbon, hydrogen, silicon or oxygen, or two or more kinds of elements is chemically used. It consists of a vapor deposition film contained by bonding or the like. For example, when a compound having a C—H bond, a compound having a Si—H bond, or a carbon unit is in the form of graphite, diamond, fullerene, etc. A derivative may be contained by a chemical bond or the like. Specific examples include hydrocarbon having a CH ₃ site, hydrosilica such as SiH ₃ silyl, SiH ₂ silylene, and hydroxyl derivatives such as SiH ₂ OH silanol. In addition to the above, the type, amount, etc., of the compound contained in the deposited film of silicon oxide can be changed by changing the conditions of the vapor deposition process. And as said content which said compound contains in the vapor deposition film | membrane of a silicon oxide, about 0.1 to 50%, Preferably about 5 to 20% is desirable. In the above, if the content is less than 0.1%, the impact resistance, spreadability, flexibility, etc. of the deposited silicon oxide film become insufficient, and scratches, cracks, etc. easily occur due to bending, It becomes difficult to stably maintain a high barrier property, and if it exceeds 50%, the barrier property is lowered, which is not preferable.

  Further, in the present invention, in the silicon oxide vapor-deposited film, the content of the above compound is preferably decreased from the surface of the silicon oxide vapor-deposited film in the depth direction, whereby the silicon oxide vapor-deposited film is formed. On the surface of the film, the impact resistance and the like can be enhanced by the above compound, etc. On the other hand, since the content of the above compound is small at the interface with the surface of the base film, vapor deposition of the base film and silicon oxide is performed. It has the advantage that the tight adhesion with the film becomes strong.

  In the present invention, for the silicon oxide vapor deposition film, for example, a surface analyzer such as an X-ray photoelectron spectrometer (Xray Photoelectron Spectroscopy, XPS) or a secondary ion mass spectrometer (Secondary Ion Mass Spectroscopy, SIMS) is used. The physical properties as described above can be confirmed by performing elemental analysis of the deposited film of silicon oxide using a method of analysis by ion etching in the depth direction.

  In the present invention, the film thickness of the above-described silicon oxide vapor deposition film is preferably about 50 to 4000 mm, and specifically, about 100 to 1000 mm. If the film thickness is greater than 1000 mm, and more preferably 4000 mm, cracks and the like are likely to occur in the film, which is not preferable. If the film thickness is less than 100 mm, and less than 50 mm, it is difficult to achieve a barrier effect. This is not preferable. In the above, the film thickness can be measured by the fundamental parameter method using, for example, a fluorescent X-ray analyzer (model name, RIX2000 type) manufactured by Rigaku Corporation. In the above, as a means for changing the film thickness of the silicon oxide vapor deposition film, the volume velocity of the vapor deposition film is increased, that is, the method of increasing the amount of monomer gas and oxygen gas and the vapor deposition rate. This can be done by a slowing method.

  Next, in the above, as a monomer gas for vapor deposition of an organic silicon compound or the like that forms a vapor deposition film of an inorganic oxide such as silicon oxide, for example, 1.1.3.3-tetramethyldisiloxane, hexamethyldisiloxane , Vinyltrimethylsilane, methyltrimethylsilane, hexamethyldisilane, methylsilane, dimethylsilane, trimethylsilane, diethylsilane, propylsilane, phenylsilane, vinyltriethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, phenyltri Methoxysilane, methyltriethoxysilane, octamethylcyclotetrasiloxane, etc. can be used.

  In the present invention, among the organic silicon compounds as described above, use of 1.1.3.3-tetramethyldisiloxane or hexamethyldisiloxane as a raw material is easy to handle and formed continuous film. In view of the above characteristics and the like, it is a particularly preferable raw material. Moreover, in the above, as an inert gas, argon gas, helium gas, etc. can be used, for example.

  Next, in the present invention, the inorganic oxide vapor-deposited film by physical vapor deposition described above will be described in more detail. Examples of the inorganic oxide vapor-deposited film by physical vapor deposition include, for example, vacuum vapor deposition and sputtering. A vapor deposition film of an inorganic oxide can be formed using a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a method, an ion plating method, or an ion cluster beam method.

  In the present invention, specifically, a metal or a metal oxide is used as a raw material, this is heated and vaporized, and this is vapor-deposited on the surface of the base film, or a metal or metal oxidation as a raw material. Using an oxidation product, oxygen is introduced to oxidize and deposit on the surface of the base film, and a deposition film is formed using a plasma-assisted oxidation reaction deposition method in which the oxidation reaction is supported by plasma. can do. In the above, as a heating method of the vapor deposition material, for example, a resistance heating method, a high frequency induction heating method, an electron beam heating method (EB), or the like can be used.

As the inorganic oxide vapor-deposited film formed by the physical vapor deposition method, for example, an amorphous thin film of aluminum oxide is preferably used, and more specifically, the formula AlO _X ( In the formula, X represents a number in the range of 0.5 to 1.5.) And an amorphous thin film of aluminum oxide represented by It is possible to use a non-crystalline thin film of aluminum oxide in which the value of X decreases in the depth direction from the thin film surface toward the inner surface. Alternatively, in the present invention, as the amorphous thin film of aluminum oxide, the non-aluminum oxide represented by the formula AlO _X (wherein X represents a number in the range of 0.5 to 1.5) is used. A non-crystalline thin film of aluminum oxide, the non-crystalline thin film of aluminum oxide having an X value increasing in the depth direction from the thin film surface toward the inner surface. Can be used. In the present invention, the value of X in the above formula can basically be X = 0.5 or more, but in the present invention, X is less than 1.0. Then, since the coloring is intense and the transparency is poor, it is desirable to use X = 1.0 or more, and when X = 1.5, aluminum and oxygen are completely oxidized. Since it is a thing of a state, a thing to X = 1.5 can be used as an upper limit.

  Next, in the present invention, the film thickness of the amorphous thin film of aluminum oxide is desirably selected and formed within a range of, for example, 10 to 3000 mm, preferably 60 to 1000 mm.

In the present invention, a non-crystalline thin film of aluminum oxide can be formed using a take-up vacuum deposition apparatus. In the above vapor deposition, the degree of vacuum in the vacuum chamber is about 10 ⁰ to 10 ⁻⁵ mbar, preferably about 10 ⁻¹ to 10 ⁻⁴ mbar. Further, the degree of vacuum of the deposition chamber is preferably about 10 ⁻² to 10 ⁻⁸ mbar, preferably about 10 ⁻³ to 10 ⁻⁷ mbar before introducing oxygen, and is preferably about 10 ⁻³ to 10 ⁻⁷ mbar. ^-1 to 10 ^-6 mbar position, ^preferably, is desirable 10 ^-2 to 10 -5 mbar position. Next, as a conveyance speed of a base film, about 10-800 m / min, Preferably about 50-600 m / min is desirable. The amount of oxygen introduced varies depending on the size of the vapor deposition machine.

  In the present invention, in the thin film layer made of an inorganic oxide by the physical vapor deposition method described above, as the vapor deposition layer made of aluminum oxide, if the degree of oxidation is too high, the formed film quality becomes hard and cracks are likely to occur. In addition, if the degree of oxidation is too low, the transparency is lowered, so that the transmittance of ultraviolet rays (wavelength 366 nm) during or immediately after the deposition is 85 to 96%, more preferably 87 to 94%. It is preferable to use an aluminum oxide vapor deposition film having a thickness in the range of 150 to 600 mm in consideration of post-processing suitability, and from silicon oxide. As the vapor deposition layer, a silicon vapor oxide layer formed by physical vapor deposition using a mixture of silicon monoxide and silicon as a raw material and having a thickness in the range of 50 to 300 mm in consideration of post-processing suitability. It is intended is preferable to use a film deposition.

  In the present invention, when an inorganic oxide vapor-deposited film is formed on the base film, the close adhesion between the surface of the base film and the inorganic oxide vapor-deposited film is improved, and finally In order to make the both firmly adhere to each other and prevent the occurrence of delamination, etc., the surface of the base film is preliminarily subjected to plasma treatment with an inert gas to form a plasma treatment surface or the like. It is preferable to provide it.

  In the present invention, the plasma-treated surface with an inert gas will be described. As such a plasma-treated surface, a surface using a plasma gas generated by ionizing gas by arc discharge on one surface of a base film is used. A plasma-treated surface can be formed using a plasma surface treatment method or the like for performing modification. That is, in the present invention, the plasma processing surface can be formed by performing plasma processing by a plasma surface processing method using an inert gas such as nitrogen gas, argon gas, helium gas or the like as the plasma gas. In the present invention, as the plasma gas, a mixed gas obtained by adding oxygen gas to the above inert gas can also be used.

  In the present invention, when forming a plasma treatment surface with an inert gas, for example, in-line plasma treatment is performed immediately before forming an inorganic oxide vapor deposition film by physical vapor deposition or chemical vapor deposition. This is desirable because it allows removal of moisture, dust, and the like on the surface of the base film, and enables surface treatment such as smoothing, activation, and the like of the surface.

  Furthermore, in the present invention, it is preferable to perform the plasma discharge treatment in consideration of conditions such as plasma output, plasma gas type, plasma gas supply amount, treatment time, and the like. In the present invention, as a method for generating plasma, for example, a direct current glow discharge, a high frequency discharge, a microwave discharge, or the like can be used. In the present invention, the plasma processing surface can also be formed using an atmospheric pressure plasma processing method or the like.

As the gas barrier coating film, a general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence of M.), a polyvinyl alcohol-based resin, and at least one alkoxide represented by A process for preparing a gas barrier composition containing an ethylene / vinyl alcohol copolymer and polycondensing by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water and an organic solvent, On the barrier thin film layer made of an inorganic oxide provided on one surface of the material film, if necessary, a gas barrier composition that undergoes polycondensation by the sol-gel method is applied via a plasma-treated surface with oxygen gas. To provide a coating film The substrate film provided with the coating film is heated at 20 ° C. to 180 ° C. and at a temperature not higher than the melting point of the substrate film for 10 seconds to 10 minutes, A step of forming a gas barrier coating film of the above gas barrier composition on the barrier thin film layer made of an inorganic oxide provided on one surface of the film, if necessary, via a plasma treatment surface of oxygen gas It can be manufactured by a manufacturing process including the like.

In the present invention, the gas barrier coating film for forming the barrier film according to the present invention has a general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ^{2 each} have 1 carbon atom) -8 represents an organic group, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence of M. In the presence of a sol-gel process catalyst, an acid, water, and an organic solvent, at least one alkoxide, and a polyvinyl alcohol-based resin and / or an ethylene / vinyl alcohol copolymer. A gas barrier composition that is polycondensed by a sol-gel method is prepared, and two or more layers are stacked on the barrier thin film layer made of an inorganic oxide provided on one surface of the base film, Gas barrier by gas barrier composition It is also possible to manufacture by forming a composite polymer layer in which two or more layers of the conductive coating film are laminated.

In the above, as the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m forming the gas barrier coating film constituting the gas barrier film according to the present invention, a partial hydrolyzate of alkoxide, hydrolysis of alkoxide At least one or more of the condensates can be used, and as the partial hydrolyzate of the above alkoxide, it is not necessary that all of the alkoxy groups are hydrolyzed, and at least one is hydrolyzed. In addition, the hydrolysis condensate may be a dimer or more of a partially hydrolyzed alkoxide, specifically, a 2 to 6 mer.

In the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , as the metal atom represented by M, silicon, zirconium, titanium, aluminum, and the like can be used. In the present invention, examples of preferable metals include silicon and titanium. In the present invention, the alkoxide can be used alone or in combination of two or more different metal atom alkoxides in the same solution.

In the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , specific examples of the organic group represented by R ¹ include, for example, a methyl group, an ethyl group, an n-propyl group, i Examples thereof include alkyl groups such as -propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group and others. In the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m , specific examples of the organic group represented by R ² include, for example, a methyl group, an ethyl group, an n-propyl group, i -Propyl group, n-butyl group, sec-butyl group, and the like. In the present invention, these alkyl groups may be the same or different in the same molecule.

In the present invention, as the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , for example, it is preferable to use an alkoxysilane in which M is Si. The alkoxysilane is represented by the general formula Si (ORa) ₄ (wherein Ra represents a lower alkyl group). In the above, Ra includes a methyl group, an ethyl group, an n-propyl group, an n-butyl group, and the like. Specific examples of the above alkoxysilane include, for example, tetramethoxysilane Si (OCH ₃ ) ₄ , tetraethoxysilane Si (OC ₂ H ₅ ) ₄ , tetrapropoxysilane Si (OC ₃ H ₇ ) ₄ , tetrabutoxysilane Si (OC ₄ H ₉ ) ₄ , etc. can be used.

In the present invention, examples of the alkoxide represented by the general formula R ¹ _n M (OR ² ) _m include, for example, the general formula Rb _n Si (ORc) _4-m (where, n is 0 The above-mentioned integer is represented, m represents an integer of 1, 2, and 3, and Rb and Rc represent a methyl group, an ethyl group, an n-propyl group, an n-butyl group, and the like. Alkoxysilanes can be used. Specific examples of the above alkylalkoxysilane include, for example, methyltrimethoxysilane CH ₃ Si (OCH ₃ ) ₃ , methyltriethoxysilane CH ₃ Si (OC ₂ H ₅ ) ₃ , dimethyldimethoxysilane (CH ₃ ) ₂ Si _{(OCH 3) 2,} dimethyl diethoxy silane _{(CH 3) 2 Si (OC} 2 H 5) 2, may use other like. Said alkoxysilane, alkylalkoxysilane, etc. can be used individually or in mixture of 2 or more types. In the present invention, a polycondensation product of the above alkoxysilane can also be used, and specifically, for example, polytetramethoxysilane, polytetraemethoxysilane, and the like can be used.

Next, in the present invention, as the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , for example, a zirconium alkoxide in which M is Zr can be used. Specific examples of the zirconium alkoxide include, for example, tetramethoxyzirconium Zr (OCH ₃ ) ₄ , tetraethoxyzirconium Zr (OC ₂ H ₅ ) ₄ , tetra ipropoxyzirconium Zr (iso-OC ₃ H ₇ ) ₄ , tetra nButoxyzirconium Zr (OC ₄ H ₉ ) ₄ , etc. can be used.

In the present invention, as the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , for example, a titanium alkoxide in which M is Ti can be used. Specific examples of the titanium alkoxide include, for example, tetramethoxytitanium Ti (OCH ₃ ) ₄ , tetraethoxytitanium Ti (OC ₂ H ₅ ) ₄ , tetraisopropoxytitanium Ti (iso-OC ₃ H ₇ ) ₄ , tetra n-butoxy titanium Ti (OC ₄ H ₉ ) ₄ , etc. can be used.

Furthermore, in the present invention, as the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , for example, an aluminum alkoxide in which M is Al can be used. Specific examples of the aluminum alkoxide include, for example, tetramethoxyaluminum Al (OCH ₃ ) ₄ , tetraethoxyaluminum Al (OC ₂ H ₅ ) ₄ , tetraisopropoxyaluminum Al (iso-OC ₃ H ₇ ) ₄ , tetra n-butoxyaluminum Al (OC ₄ H ₉ ) ₄ , etc. can be used.

  In the present invention, the above alkoxides may be used as a mixture of two or more thereof. In the present invention, in particular, by using a mixture of alkoxysilane and zirconium alkoxide, it is possible to improve the toughness, heat resistance, etc. of the resulting barrier film, and to reduce the retort resistance of the film during stretching. Is to be avoided. The amount of the zirconium alkoxide used is in the range of 10 parts by weight or less with respect to 100 parts by weight of the alkoxysilane, preferably about 5 parts by weight. In the above, when the amount exceeds 10 parts by weight, the formed gas barrier coating film is easily gelled, and the brittleness of the film is increased, so that the gas barrier coating film is easily peeled off when the base film is coated. This is not preferable.

  In the present invention, in particular, by using a mixture of alkoxysilane and titanium alkoxide, there is an advantage that the thermal conductivity of the obtained gas barrier coating film is lowered and the heat resistance of the barrier film is remarkably improved. In the above, the amount of titanium alkoxide used is in the range of 5 parts by weight or less with respect to 100 parts by weight of the alkoxysilane, and preferably about 3 parts by weight. In the above, if it exceeds 5 parts by weight, the gas barrier coating film to be formed becomes more brittle, and when the base film is coated, the gas barrier coating film tends to peel off, which is not preferable. is there.

  Next, as the polyvinyl alcohol resin and / or ethylene / vinyl alcohol copolymer forming the gas barrier coating film constituting the barrier film according to the present invention, polyvinyl alcohol resin or ethylene A vinyl alcohol copolymer can be used alone, respectively, or a polyvinyl alcohol-based resin and an ethylene / vinyl alcohol copolymer can be used in combination, and in the present invention, By using a polyvinyl alcohol-based resin and / or an ethylene / vinyl alcohol copolymer, the gas barrier properties, water resistance, weather resistance, and other physical properties of the gas barrier coating film can be remarkably improved. is there. In particular, in the present invention, by using a combination of a polyvinyl alcohol resin and an ethylene / vinyl alcohol copolymer, in addition to the above physical properties such as gas barrier properties, water resistance, and weather resistance, hot water resistance and heat resistance A gas barrier coating film remarkably excellent in gas barrier properties after water treatment can be formed.

  In the present invention, when a polyvinyl alcohol-based resin and an ethylene / vinyl alcohol copolymer are used in combination, the blending ratio of each is, as a weight ratio, polyvinyl alcohol-based resin: ethylene / vinyl alcohol. The copolymer is preferably in the 10: 0.05 to 10: 6 position, and more preferably in a blending ratio of about 10: 1.

  In the present invention, the content of the polyvinyl alcohol-based resin and / or the ethylene / vinyl alcohol copolymer is in the range of 5 to 500 parts by weight with respect to 100 parts by weight of the total amount of the alkoxide, Preferably, it is preferable to prepare the gas barrier composition at a blending ratio of about 20 to 200 parts by weight. In the above, exceeding 500 parts by weight is not preferable because the brittleness of the gas barrier coating film is increased, and the water resistance and weather resistance of the resulting gas barrier laminated film tend to decrease. If it is below, the gas barrier property is lowered, which is not preferable.

  In the present invention, as the polyvinyl alcohol-based resin and / or ethylene / vinyl alcohol copolymer, first, as the polyvinyl alcohol-based resin, generally obtained by saponifying polyvinyl acetate is used. be able to. As the above-mentioned polyvinyl alcohol-based resin, partially saponified polyvinyl alcohol resin in which several tens of percent of acetic acid groups remain, or completely saponified polyvinyl alcohol in which acetic acid groups do not remain, or OH groups have been modified. A modified polyvinyl alcohol resin may be used and is not particularly limited. Specific examples of the polyvinyl alcohol resin include RS-110 (saponification degree = 99%, polymerization degree = 1,000), an RS polymer manufactured by Kuraray Co., Ltd., and Kuraray Poval LM-20SO (saponification) manufactured by the same company. Degree = 40%, degree of polymerization = 2,000), Gohsenol NM-14 (degree of saponification = 99%, degree of polymerization = 1,400) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. can be used.

  In the present invention, as the ethylene-vinyl alcohol copolymer, a saponified product of a copolymer of ethylene and vinyl acetate, that is, a product obtained by saponifying an ethylene-vinyl acetate random copolymer should be used. Can do. Specific examples include partial saponification products in which several tens mol% of acetic acid groups remain to complete saponification products in which acetic acid groups remain only a few mol% or no acetic acid groups remain. However, it is desirable to use a saponification degree that is preferably 80 mol% or more, more preferably 90 mol% or more, and still more preferably 95 mol% or more from the viewpoint of gas barrier properties. The content of repeating units derived from ethylene in the ethylene / vinyl alcohol copolymer (hereinafter also referred to as “ethylene content”) is usually 0 to 50 mol%, preferably 20 to 45 mol%. Is preferably used. Specific examples of the ethylene / vinyl alcohol copolymer include Kuraray Co., Ltd., Eval EP-F101 (ethylene content: 32 mol%), Nippon Synthetic Chemical Industry Co., Ltd., Soarnol D2908 (ethylene content: 29 mol%). ) Etc. can be used.

Next, in the present invention, the gas barrier composition for forming the gas barrier coating film constituting the barrier film according to the present invention will be described. As the gas barrier composition, the general formula R ¹ _n M as described above is used. (OR ² ) _m (wherein, R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, and m represents An integer of 1 or more, and n + m represents the valence of M.) and at least one alkoxide represented by the following formula: polyvinyl alcohol resin and / or ethylene / vinyl alcohol copolymer In addition, a gas barrier composition that contains a coalescence and is polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water, and an organic solvent is prepared.

  In preparing the gas barrier composition, for example, a silane coupling agent or the like can be added. And as said silane coupling agent, known organic reactive group containing organoalkoxysilane can be used. In the present invention, an organoalkoxysilane having an epoxy group is particularly suitable. For example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β- ( 3,4-epoxycyclohexyl) ethyltrimethoxysilane or the like can be used. The above silane coupling agents may be used alone or in combination of two or more. In this invention, the usage-amount of the above silane coupling agents can be used within the range of 1-20 weight part with respect to 100 weight part of said alkoxysilane. In the above, use of 20 parts by weight or more is not preferable because the gas barrier coating film to be formed has increased rigidity and brittleness, and the insulating property and workability of the gas barrier coating film tend to be lowered. It is.

  Next, as the sol-gel method catalyst, mainly the polycondensation catalyst, used in the gas barrier composition, a tertiary amine that is substantially insoluble in water and soluble in an organic solvent is used. Specifically, for example, N, N-dimethylbenzylamine, tripropylamine, tributylamine, tripentylamine, and the like can be used. In the present invention, N, N-dimethylbenzylamine is particularly preferred. The amount used is 0.01 to 1.0 part by weight, preferably about 0.03 parts by weight per 100 parts by weight of the total amount of alkoxide and silane coupling agent. The acid used in the gas barrier composition is used as a catalyst for the sol-gel method, mainly as a catalyst for hydrolysis of an alkoxide, a silane coupling agent, or the like. Examples of the acid include mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid, organic acids such as acetic acid and tartaric acid, and the like. The amount of the acid used is about 0.001 to 0.05 mol, preferably about 0.01 mol, relative to the total molar amount of the alkoxide and the alkoxide content of the silane coupling agent (for example, silicate moiety). Is preferred.

  Further, in the gas barrier composition, water can be used in an amount of 0.1 to 100 mol, preferably 0.8 to 2 mol, relative to 1 mol of the total molar amount of the alkoxide. When the amount of water exceeds 2 mol, the polymer obtained from the alkoxysilane and the metal alkoxide becomes spherical particles, and the spherical particles crosslink three-dimensionally, resulting in low density and porosity. Such a porous polymer is not preferable because the gas barrier property of the barrier film cannot be improved. On the other hand, if the amount of water is less than 0.8 mol, the hydrolysis reaction tends to hardly proceed, which is not preferable.

  Furthermore, as the organic solvent used in the gas barrier composition, for example, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butanol, and the like can be used. Furthermore, in the gas barrier composition, the polyvinyl alcohol-based resin and / or the ethylene / vinyl alcohol copolymer is in a state of being dissolved in a coating solution containing the alkoxide, the silane coupling agent, or the like. Therefore, the type of the organic solvent is appropriately selected. When a polyvinyl alcohol resin and an ethylene / vinyl alcohol copolymer are used in combination, it is preferable to use n-butanol. In the present invention, as the ethylene / vinyl alcohol copolymer solubilized in a solvent, for example, those commercially available as Soarnol (trade name) can be used. The amount of the organic solvent used is usually 30 per 100 parts by weight of the total amount of the alkoxide, silane coupling agent, polyvinyl alcohol resin and / or ethylene / vinyl alcohol copolymer, acid and sol-gel catalyst. ~ 500 parts by weight.

  Next, according to one aspect of the present invention, the barrier film according to the present invention can be specifically produced, for example, as follows. First, an alkoxide such as alkoxysilane, a silane coupling agent, a polyvinyl alcohol resin and / or an ethylene / vinyl alcohol copolymer, a sol-gel catalyst, an acid, water, an organic solvent, and, if necessary, A metal alkoxide or the like is mixed to prepare a gas barrier composition (coating liquid). Next, a polycondensation reaction gradually proceeds in the gas barrier composition (coating liquid). Next, the above gas barrier composition (coating liquid) is applied by a conventional method on the barrier thin film layer made of an inorganic oxide provided on one surface of the base film and dried. . Then, by the above drying, polycondensation of the alkoxide such as alkoxysilane, metal alkoxide, silane coupling agent, polyvinyl alcohol resin and / or ethylene / vinyl alcohol copolymer proceeds, and a coating film is formed. Is done. Further, preferably, the above coating operation is repeated to stack a plurality of coating films composed of two or more layers. Finally, the base film coated with the above coating liquid is at a temperature of about 20 ° C. to 180 ° C. and a temperature below the melting point of the base film, preferably at a temperature in the range of about 50 ° C. to 160 ° C. A gas barrier coating film made of the above gas barrier composition (coating liquid) is formed on the barrier thin film layer made of an inorganic oxide formed on one surface of the base film by heat treatment for 10 seconds to 10 minutes. The barrier film according to the present invention can be produced by forming one or more layers. The barrier film according to the present invention thus obtained is excellent in gas barrier properties.

  In the present invention, in place of the polyvinyl alcohol resin, an ethylene / vinyl alcohol copolymer, or both a polyvinyl alcohol resin and an ethylene / vinyl alcohol copolymer are used in the same manner as described above. The barrier film according to the present invention produced by performing drying and heat treatment has an advantage that the gas barrier property after hot water treatment such as boil treatment and retort treatment is further improved.

  Furthermore, in the present invention, as described above, when ethylene vinyl alcohol copolymer or polyvinyl alcohol resin and ethylene vinyl alcohol copolymer are not used in combination, that is, only polyvinyl alcohol resin is used. And when manufacturing the barrier film which concerns on this invention, in order to improve the gas barrier property after a hot-water process, for example, the gas barrier composition which used polyvinyl alcohol-type resin beforehand is applied. A first coating layer is formed, and then a gas barrier composition containing an ethylene / vinyl alcohol copolymer is applied on the coating layer to form a second coating layer. By forming the composite layer, it is possible to improve the gas barrier property of the barrier film according to the present invention.

  Furthermore, the coating layer formed by the gas barrier composition containing the above-mentioned ethylene / vinyl alcohol copolymer, or the gas barrier composition containing a combination of a polyvinyl alcohol-based resin and an ethylene / vinyl alcohol copolymer. Forming a plurality of coating layers formed of an object as a plurality of layers is also an effective means for improving the gas barrier properties of the barrier film according to the present invention.

  Next, as an embodiment of the present invention, the operation of the barrier film production method according to the present invention will be described with reference to the case where alkoxysilane is used as the alkoxide. First, the alkoxysilane and the metal alkoxide are hydrolyzed by the added water. At that time, the acid serves as a catalyst for hydrolysis. Next, protons are taken from the generated hydroxyl groups by the action of the sol-gel catalyst, and hydrolyzed products are dehydrated and polycondensed. At this time, the silane coupling agent is simultaneously hydrolyzed by the acid catalyst, and the alkoxy group becomes a hydroxyl group. In addition, due to the action of the base catalyst, ring opening of the epoxy group also occurs and a hydroxyl group is generated. A polycondensation reaction between the hydrolyzed silane coupling agent and the hydrolyzed alkoxide also proceeds. Furthermore, since the reaction system contains a polyvinyl alcohol resin, an ethylene / vinyl alcohol copolymer, or a polyvinyl alcohol resin and an ethylene / vinyl alcohol copolymer, the polyvinyl alcohol resin and the ethylene / vinyl alcohol Reaction with the hydroxyl group of the copolymer also occurs. The resulting polycondensate contains, for example, an inorganic part composed of bonds such as Si—O—Si, Si—O—Zr, Si—O—Ti, and the like, and an organic part derived from the silane coupling agent. In the above-described reaction constituting the composite polymer, for example, a linear polymer having a partial structural formula represented by the following formula (III) and further having a portion derived from a silane coupling agent is first generated. . This polymer has an OR group (an alkoxy group such as an ethoxy group) branched from a linear polymer. The OR group is hydrolyzed to become an OH group using an existing acid as a catalyst, and the OH group is first deprotonated by the action of a sol-gel catalyst (base catalyst), and then polycondensation proceeds. That is, this OH group undergoes a polycondensation reaction with a polyvinyl alcohol-based resin represented by the following formula (I) or an ethylene / vinyl alcohol copolymer represented by the following formula (II) to form Si—O—Si. It is considered that a composite polymer having a bond, for example, represented by the following formula (IV) or a copolymerized composite polymer represented by the following formulas (V) and (VI) is formed.

  The above reaction proceeds at room temperature, and the viscosity of the gas barrier composition (coating liquid) increases during preparation. When this gas barrier composition (coating liquid) is provided on one surface of a base film, it is applied onto a barrier thin film layer made of an inorganic oxide, heated to produce a solvent and an alcohol produced by a polycondensation reaction. When removed, the polycondensation reaction is completed, and a transparent coating layer is formed on the barrier thin film layer made of an inorganic oxide provided on one surface of the base film. In the case of laminating a plurality of the above-mentioned coating layers, the composite polymers in the coating layers between layers are also condensed, and the layers are firmly bonded to each other. Further, since the organic reactive group of the silane coupling agent or the hydroxyl group generated by hydrolysis is bonded to the hydroxyl group on the surface of the barrier thin film layer made of an inorganic oxide provided on one surface of the base film, Adhesiveness and adhesion between the surface of the barrier thin film layer made of an inorganic oxide provided on one surface of the material film and the coating layer are also good.

  In the method of the present invention, the amount of water added is adjusted to 0.8 to 2 moles, preferably 1.5 moles relative to 1 mole of alkoxides. Is formed. Such a linear polymer has crystallinity and has a structure in which a large number of minute crystals are embedded in an amorphous part. Such a crystal structure is the same as that of a crystalline organic polymer (for example, vinylidene chloride or polyvinyl alcohol), and a polar group (OH group) is partially present in the molecule, and the molecular aggregation energy is high. Excellent gas barrier properties due to high rigidity.

Since the barrier film according to the present invention has the above-described excellent characteristics, it is useful as a packaging material, and in particular, has a gas barrier property (permeation of gas barrier properties (O ₂ , N ₂ , H ₂ O, CO ₂ , etc.). Therefore, it is preferably used as a barrier substrate constituting a food packaging film. In particular, when used for so-called gas-filled packaging filled with N ₂ or CO ₂ gas, the excellent gas barrier property is extremely effective for holding the filled gas. Furthermore, the barrier film according to the present invention is excellent in hot water treatment, particularly high-pressure hot water treatment (retort treatment), and exhibits extremely excellent gas barrier properties.

  In the present invention, the barrier thin film layer made of an inorganic oxide and the gas barrier coating film form, for example, a chemical bond, a hydrogen bond, or a coordinate bond by hydrolysis / co-condensation reaction, and the inorganic oxide The adhesion between the barrier thin film layer and the gas barrier coating film is improved, and a better gas barrier effect can be exhibited by the synergistic effect of the two layers. As a method of applying the gas barrier composition of the present invention, for example, a roll coating such as a gravure roll coater, a spray coating, a spin coating, a dipping, a brush, a barcode, an applicator, etc. Alternatively, a coating film having a dry film thickness of 0.01 to 30 μm, preferably about 0.1 to 10 μm, can be formed by applying a plurality of times, and further, under a normal environment, 50 to 300 ° C., Preferably, the condensation is carried out by heating and drying at a temperature of 70 to 200 ° C. for 0.005 to 60 minutes, preferably 0.01 to 10 minutes, and the first or second of the present invention. A gas barrier coating film can be formed. Further, if necessary, when applying the gas barrier composition of the present invention, a primer agent or the like can be applied on the barrier thin film layer made of an inorganic oxide in advance. A pretreatment such as a discharge treatment or a plasma treatment can be optionally performed.

  As described above, the barrier film according to the present invention is formed on one surface of the base film, if necessary, a plasma-treated surface with an inert gas, a barrier thin film layer made of an inorganic oxide, and if necessary. A plasma-treated surface or primer agent layer with an oxygen gas to be provided, and a gas barrier coating film may be sequentially laminated.

<Resin layer>
The laminate using the barrier film according to the present invention may further include at least one resin layer. Examples of the resin layer include a layer made of a resin material containing a biomass-derived raw material and a layer made of a resin material containing a conventional fossil fuel-derived raw material. When two or more resin layers are provided, each may have the same composition or a different composition. The resin layer can be formed directly or via an adhesive layer on the base material layer or the vapor deposition layer.

  According to one aspect of the present invention, the resin layer is preferably made of a resin material containing a biomass-derived raw material. A carbon neutral resin layer can be formed by forming the resin layer from a resin material containing a biomass-derived raw material. Therefore, the amount of fossil fuel used can be greatly reduced, and the environmental load can be reduced.

  Examples of the resin layer made of biomass-derived materials include one or more resin materials selected from the group consisting of cellophane, starch, polylactic acid, polyethylene, polypropylene, nylon, polymethylene terephthalate, polyethylene terephthalate, and cellulose. Can be mentioned. It is preferable that a biomass material is used for at least a part of the resin material forming the resin layer. Moreover, a resin layer can be formed by a conventionally well-known method, and is not specifically limited. In the present invention, the base material layer and the resin layer may be formed from the same biomass-derived raw material (for example, biomass ethanol). Furthermore, you may synthesize | combine the resin material for forming a resin layer using commercially available biomass ethylene glycol similarly to a base material layer. The composition of the resin layer may be the same composition as the composition of the base material layer.

  In the laminate of the present invention, a laminate having two or more layers made of carbon neutral resin can be produced by laminating a conventional resin layer made of biomass-derived resin on the barrier film. . As the resin layer, a commercially available polylactic acid film may be used. For example, a polylactic acid film commercially available from Mitsui Chemical Tosero Co., Ltd. can be suitably used.

  According to another aspect, the resin layer may be a resin layer made of a resin material containing a raw material derived from a conventional fossil fuel. In the laminate of the present invention, a resin layer made of a resin derived from a conventional fossil fuel is laminated on a barrier film, so that heat resistance, pressure resistance, water resistance, heat sealability, pinhole resistance, pinhole resistance, The piercing property and other physical properties can be imparted or improved.

  As a resin layer made of a fossil fuel-derived raw material, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, Resins such as ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, or ionomer can be used. These resins may be formed by an extrusion laminating method, or may be laminated in advance as a film formed by a T-die method or an inflation method by a heat-resistant substrate layer and a dry laminating or extrusion laminating method. .

  Also, stretched polyethylene terephthalate film, silica-deposited stretched polyethylene terephthalate film, alumina-deposited stretched polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film, nylon 6 / Metaxylylenediamine nylon 6 co-extrusion co-stretched film or polypropylene / ethylene-vinyl alcohol copolymer co-extrusion co-stretched film or the like, or a composite film obtained by laminating two or more of these films may be used.

<Other layers>
According to one aspect of the present invention, the laminate according to the present invention may further include at least one other layer in addition to the base material layer, the vapor deposition layer, and the resin layer. Examples of the other layer include a layer made of a metal foil obtained by rolling a metal, an adhesive layer, and a printed layer. When two or more other layers are included, each may have the same composition or a different composition. Other layers can be formed on a base material layer or a vapor deposition layer.

  A conventionally known metal foil can be used as the metal foil. Aluminum foil or the like is preferable from the viewpoint of gas barrier properties that prevent the transmission of oxygen gas, water vapor, and the like, and light shielding properties that prevent the transmission of visible light, ultraviolet light, and the like.

A printing layer can be formed using a conventionally well-known pigment and dye, The formation method is not specifically limited. Further, the adhesive layer is an adhesive layer or an adhesive resin layer formed in order to bond any two layers by lamination. As an adhesive for laminating, for example, one or two-component cured or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, Other adhesives such as solvent type, aqueous type, and emulsion type can be used. Examples of the coating method for the adhesive include a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a fountain method, a transfer roll coating method, and other methods. As the coating ^{amount, 0.1g / m 2 ~10g / m} 2 ( dry state) position are ^{preferred, 1g / m 2 ~5g / m} 2 ( dry state) position is more preferred.

  In addition, a resin layer made of a thermoplastic resin layer is used as the adhesive resin layer. Specifically, the material of the adhesive resin layer includes a low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, a linear low density polyethylene resin, and ethylene / α-olefin polymerized using a metallocene catalyst. Copolymer resin, ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, Graft polymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to ethylene / methyl methacrylate copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, polyolefin resin, Or graft copolymerized resin, maleic anhydride to polyolefin resin It can be used sexual resin or the like. These materials can be used alone or in combination.

<Layer structure>
About the layer structure of the laminated body of this invention, if it has a base material layer and a vapor deposition layer, it will not specifically limit, The same layer structure as the conventional laminated film may be sufficient. For example, PET / deposition layer / PE (PEF), PET / deposition layer / CPP, PET / deposition layer / CNY, PET / deposition layer / PET / PE, PET / deposition layer / PET / CPP, PET / deposition layer / AL / PE, PET / deposition layer / AL / CPP, PET / deposition layer / ONY / PE, PET / deposition layer / ONY / CPP, ONY / deposition layer / PET / PE, ONY / deposition / PET / CPP, PET / deposition Layer / PVA / PE, PET / deposition layer / PVA / CPP, PET / deposition layer / PVC / PE, PET / deposition layer / PVC / CPP, PET / deposition layer / AL / ONY / PE, PET / deposition layer / AL / ONY / CPP, PET / deposition layer / ONY / AL / PE, PET / deposition layer / ONY / AL / CPP, PET / deposition layer / paper / PE, PET / deposition layer / paper / CPP, paper / AL / ET / vapor deposited layer / PE, paper / AL / PET / vapor deposition layer / CPP, and OPP / PET / vapor deposition layer / AL / OPP and the like. In addition, the name of each abbreviation is as follows. PET: polyethylene terephthalate, PE: polyethylene, PEF: polyethylene film, CNY: unstretched nylon, ONY: stretched nylon, AL: aluminum foil, CPP: unstretched polypropylene, OPP: biaxially stretched polypropylene, PVA: polyvinyl alcohol, PVC: PVC.

<Processing>
The laminate according to the present invention is provided with chemical functions, electrical functions, magnetic functions, mechanical functions, friction / abrasion / lubrication functions, optical functions, thermal functions, surface functions such as biocompatibility, etc. For the purpose, it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metalizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, Coating, etc.). Further, the laminate according to the present invention can be subjected to laminating processing (dry laminating or extrusion laminating), bag making processing, and other post-processing processing to produce a molded product.

<Application>
The laminate using the barrier film according to the present invention can be suitably used for packaging products, various label materials, lid materials, sheet molded products, laminated tubes and the like, and in particular, laminated films or packaging bags ( For example, a pillow bag, a pouch such as a standing pouch or a four-way pouch) is preferable. The thickness of the laminate can be appropriately determined according to the application. For example, it is used in the form of a film or sheet having a thickness of about 5 to 500 μm, preferably about 10 to 300 μm.

  Hereinafter, although the present invention is explained based on an example, the present invention is not limited to these.

<Synthesis of biomass-derived polyester>
83 parts by mass of terephthalic acid and 62 parts by mass of biomass ethylene glycol (manufactured by India Glycol) were supplied as a slurry to the reaction vessel, and the esterification reaction was carried out at 240 ° C. for 5 hours by a conventional direct weight method. Thereafter, 0.013 parts by mass of trimethyl phosphate (manufactured by Aldrich) was added (15 mmol% with respect to the acid component), and then the polymerization reaction was performed under a high-temperature vacuum condition. First, in 40 minutes, the degree of vacuum was raised to 4000 Pa and the polymerization temperature was 280 ° C., and then the degree of vacuum was lowered to 200 Pa while maintaining the polymerization temperature at 280 ° C. to carry out a melt polymerization reaction. The reaction time was 3 hours. The synthesized polymer was discharged into running water in the form of strands and pelletized by a pelletizer. The pellets were dried at 160 ° C. for 5 hours and then subjected to solid phase polymerization at 205 ° C. under a vacuum of 50 Pa in a nitrogen atmosphere to obtain a polymer having an intrinsic viscosity of 0.8 dl / g. The intrinsic viscosity was calculated from the melt viscosity measured at 35 ° C. using a phenol / tetrachloroethane (component ratio: 3/2) solvent. When the obtained polymer was subjected to differential thermal analysis (apparatus: Shimadzu DSC-60, measurement condition: helium gas, heated at 6 ° C./min), the glass transition temperature was 69 ° C., which was derived from fossil fuel. It was equivalent to the known polyethylene terephthalate obtained from the raw material. Moreover, when the carbon-made measurement of the obtained biomass-derived polyethylene terephthalate was performed, the content of biomass-derived carbon as measured by radioactive carbon (C14) was 16%.

<Production of film 1>
After drying 90 parts by mass of the polyethylene terephthalate pellets obtained as described above and 10 parts by mass of a polyethylene terephthalate masterbatch derived from a fossil fuel containing 200 ppm of porous silica having an average particle size of 0.9 μm as a lubricant, it is fed into an extruder. It was fed, melted at 285 ° C., extruded into a sheet form from a T die, and cooled and solidified with a cooling roll to obtain an unstretched sheet. Next, this unstretched sheet was stretched at a magnification of 3.5 times in the longitudinal direction at a speed of the low speed drive roll of 6.5 m / min and a speed of the high speed drive roll of 22 m / min. A biaxially stretched polyester film 1 having a thickness of 12.02 μm was obtained by stretching in the transverse direction at a magnification of 3.5 times.

<Production of film 2>
60 parts by mass of the polyethylene terephthalate pellets obtained as described above, 30 parts by mass of recycled PET (re-pelleted in-process loss parts such as ear loss during film formation), and the polyethylene terephthalate master used above After drying 10 parts by mass of the batch, it was supplied to an extruder, melted at 285 ° C., extruded into a sheet form from a T die, and cooled and solidified with a cooling roll to obtain an unstretched sheet. Next, this unstretched sheet was stretched at a magnification of 3.5 times in the longitudinal direction at a speed of the low speed drive roll of 6.5 m / min and a speed of the high speed drive roll of 22 m / min. A biaxially stretched polyester film 2 having a thickness of 12.13 μm was obtained by stretching in the transverse direction at a magnification of 3.5 times.

<Production of film 3>
60 parts by mass of polyethylene terephthalate (inherent viscosity: 0.83 dl / g) manufactured from raw materials derived from conventional fossil fuels, and recycled PET (re-pelletized loss parts in the manufacturing process such as ear loss during film formation) 30 parts by mass and 10 parts by mass of the polyethylene terephthalate masterbatch used above are dried and then supplied to an extruder, melted at 285 ° C., extruded into a sheet form from a T-die, and cooled and solidified by a cooling roll. A stretched sheet was obtained. Next, this unstretched sheet was stretched at a magnification of 3.5 times in the longitudinal direction at a speed of the low speed drive roll of 6.5 m / min and a speed of the high speed drive roll of 22 m / min. A biaxially stretched polyester film 3 having a thickness of 12.06 μm was obtained by stretching in the transverse direction at a magnification of 3.5 times.

<Radiated carbon measurement>
When the obtained film 1 was subjected to radiation carbon measurement, the content of biomass-derived carbon as measured by radioactive carbon (C14) was 14%. Moreover, when the radiation carbon measurement was similarly performed about the films 2 and 3, the content of carbon derived from biomass was 10% and 0%, respectively.

<Evaluation of film>
From each of the obtained film in the MD direction (winding direction) and the TD direction (direction made by an angle of 90 degrees with the MD direction), a test piece was cut into a width of 15 mm and a length of 200 mm, and a tensile tester (Tensilon). Using RTC-125A (Orientec Co., Ltd.), the tensile strength of the test piece was measured in an environment of a temperature of 23 ° C. and a humidity of 50 RH%. In addition, F5 values in MD and TD directions (tensile strength when the film was stretched 5%) were measured. Table 1 shows the tensile strength (kg / mm ² ) and elongation at break (%), and F5 value (kg / mm ² ) in the MD direction and TD direction, respectively.

  Moreover, the test piece cut out from each of MD direction and TD direction was put into a 150 degreeC heating oven, and the heat shrink rate when heat-treating for 30 minutes at 150 degreeC based on JIS / C-2318 was measured. The results were as shown in Table 1.

  Each film obtained above was cut into a width of 50 mm and a length of 50 mm to obtain a test piece. Using this test piece, a haze meter (NDH4000, manufactured by Nippon Denshoku Industries Co., Ltd.) was used at 23 ° C. and a humidity of 50 RH%. The haze measurement of the film was performed under the environment. The measurement was performed according to JIS K7136: 2000. The measurement results were as shown in Table 1 below.

  In addition, for each of the film surfaces subjected to corona treatment and those not subjected to the corona treatment, a wet tension test mixed solution (manufactured by Wako Pure Chemical Industries, Ltd.) is used for a test piece cut to a width of 50 mm and a length of 50 mm. Then, the wetting tension was measured in an environment of 23 ° C. and humidity of 50 RH%. The measurement was performed according to JIS K6768: 1999. The measurement results were as shown in Table 1 below.

  Further, the friction coefficient between the test pieces subjected to the corona treatment on the surface obtained above and the friction coefficient between the test pieces not subjected to the corona treatment were measured using a friction coefficient measuring device (AFT-200, Daiei Scientific Instruments Co., Ltd.). The measurement was performed in an environment of 23 ° C. and humidity of 50 RH%. The measurement was performed according to JIS K7125: 1999. The measurement results were as shown in Table 1 below.

  Further, as a comparative control, a general polyester film 4 (E-5100, manufactured by Toyobo Co., Ltd.) was prepared, and the film properties were measured in the same manner as described above. The measurement results are also shown in Table 1.

  As is clear from Table 1, polyethylene terephthalate films (biomass PET films) 1 and 2 synthesized using biomass-derived ethylene glycol are polyester films (PET films) manufactured from raw materials obtained from conventional fossil fuels. ) It can be seen that even if compared with 3 and 4, it has comparable physical properties.

Example 1
<Preparation 1 of laminated body>
Aluminum vapor deposition was performed on one surface of the biomass PET film 1 (thickness 12 μm) obtained as described above (deposition condition: deposition source: aluminum, degree of vacuum in the deposition chamber: 2 × 10 ⁻³ mbar, The degree of vacuum in the winding chamber: 3 × 10 ⁻² mbar, the film conveyance speed: 350 m / min, and the film thickness: 450 mm. Further, another biomass PET film 1 (thickness 12 μm) obtained as described above is further prepared (referred to as biomass PET film 1 ′), subjected to corona treatment on one surface, and printed on the corona-treated surface. Layers (picture and white hold) were formed. And the vapor deposition surface of biomass PET film 1 and the printing surface of biomass PET film 1 'were bonded by dry lamination. Furthermore, the other surface of the biomass PET film 1 (surface opposite to the vapor deposition surface) and a general linear low-density polyethylene film (Mitsui Chemicals Tosero Co., Ltd .: TUX FC-D, thickness 80 μm) Were laminated by dry lamination to obtain a laminated film. The printing ink used was New LP Super manufactured by Toyo Ink. A urethane-based adhesive (Mitsui Chemicals Co., Ltd .: Takerak A-515V / Takenate A-5) was used for bonding by dry lamination, and the coating amount during drying was adjusted to 3.5 g / m ² . After pasting, aging was performed at 40 ° C. for 48 hours. This laminated film had a layer structure as shown in FIG. Using this laminated film, a standing pouch having an outer dimension of 120 mm × 190 mm, a folding width of 35 mm, and an outer peripheral seal width of 5 mm was prepared.

Example 2
<Preparation of laminate 2>
(1) A biomass PET film 1 (thickness: 12 μm) obtained as described above was prepared, and one surface was subjected to corona treatment. The biomass PET film 1 that has been subjected to corona treatment is mounted on a take-out roll of a take-up vacuum deposition apparatus, and then this is fed out, and aluminum is used as a vapor deposition source on the corona-treated surface of the biomass PET film 1 so that oxygen While supplying the gas, an aluminum oxide vapor deposition film having a thickness of 200 mm was formed under the following vapor deposition conditions by a vacuum vapor deposition method using an electron beam (EB) heating method.
(Deposition conditions)
Degree of vacuum in the deposition chamber: 2 × 10 ⁻⁴ mbar
Degree of vacuum in the take-up chamber: 2 × 10 ⁻² mbar
Electron beam power: 25kW
Film transport speed: 240 m / min
Deposition surface: Corona-treated surface
(2) Next, to a mixed solution composed of polyvinyl alcohol, isopropyl alcohol and ion-exchanged water of composition a prepared according to the composition table shown below, ethyl silicate, silane coupling agent, isopropyl alcohol of composition b, Hydrolysis solution composed of hydrochloric acid and ion-exchanged water was added and stirred to obtain a colorless and transparent barrier coating solution.
Composition table a
Polyvinyl alcohol 2.30
Isopropyl alcohol 2.70
H ₂ O 51.20
b
Ethyl silicate 16.60
Silane coupling agent 0.20
Isopropyl alcohol 3.90
0.5N hydrochloric acid aqueous solution 0.50
H ₂ O 22.60
Total 100.00 (wt%)
(3) Next, the aluminum oxide deposition surface is coated with the gas barrier composition (barrier coating solution) produced above, and then heat-treated at a drying temperature of 180 ° C. and a line speed of 100 m / min. A gas barrier coat layer having a thickness of 0.3 μm (in the dry operation state) was formed to produce a gas barrier laminate film. The vapor-deposited surface of the aluminum oxide vapor-deposited PET film thus obtained and a general nylon film (manufactured by Toyobo Co., Ltd .: Harden N1200, thickness 15 μm) were bonded together by dry lamination. Furthermore, a general linear low-density polyethylene film (manufactured by Mitsui Chemical Tosero Co., Ltd .: TUX FC-D, thickness 80 μm) was bonded to the nylon film by dry lamination to obtain a laminated film. . A urethane-based adhesive (Mitsui Chemicals Co., Ltd .: Takerak A-515V / Takenate A-5) was used for bonding by dry lamination, and the coating amount during drying was adjusted to 3.5 g / m ² . After pasting, aging was performed at 40 ° C. for 48 hours. This laminated film had a layer structure as shown in FIG. Using this laminated film, a standing pouch having an outer dimension of 120 mm × 190 mm, a folding width of 35 mm, and an outer peripheral seal width of 5 mm was prepared.

Comparative Example 1
<Production 3 of Laminate>
One side of the general PET film 4 (thickness 12 μm) prepared above was subjected to corona treatment, and a printing layer (pattern and white press) was formed on the corona treatment surface. And the printing surface of PET film 4 and the vapor deposition surface of the general aluminum vapor deposition PET film 5 (thickness 12 micrometers) prepared above were bonded by dry lamination. Furthermore, the surface opposite to the vapor deposition surface of the aluminum vapor-deposited PET film 5 and a general linear low-density polyethylene film (Mitsui Chemicals Tosero Co., Ltd .: TUX FC-D, thickness 80 μm) are dry laminated. Bonding was performed to obtain a laminated film. The printing ink used was New LP Super manufactured by Toyo Ink. A urethane-based adhesive (Mitsui Chemicals Co., Ltd .: Takerak A-515V / Takenate A-5) was used for bonding by dry lamination, and the coating amount during drying was adjusted to 3.5 g / m ² . After pasting, aging was performed at 40 ° C. for 48 hours. This laminated film had a layer structure as shown in FIG. Using this laminated film, a standing pouch having an outer dimension of 120 mm × 190 mm, a folding width of 35 mm, and an outer peripheral seal width of 5 mm was prepared.

Comparative Example 2
<Fabrication 4>
Aluminum oxide was vapor-deposited and a gas barrier coat layer was formed on a general PET film (Toyobo Co., Ltd .: E-5100, thickness 12 μm) in the same manner as in Example 2 above. The vapor-deposited surface of the aluminum oxide vapor-deposited PET film thus obtained and a general nylon film (manufactured by Toyobo Co., Ltd .: Harden N1200, thickness 15 μm) were bonded together by dry lamination. Furthermore, a general linear low-density polyethylene film (manufactured by Mitsui Chemical Tosero Co., Ltd .: TUX FC-D, thickness 80 μm) was bonded to the nylon film by dry lamination to obtain a laminated film. . A urethane-based adhesive (Mitsui Chemicals Co., Ltd .: Takerak A-515V / Takenate A-5) was used for bonding by dry lamination, and the coating amount during drying was adjusted to 3.5 g / m ² . After pasting, aging was performed at 40 ° C. for 48 hours. This laminated film had a layer structure as shown in FIG. Using this laminated film, a standing pouch having an outer dimension of 120 mm × 190 mm, a folding width of 35 mm, and an outer peripheral seal width of 5 mm was prepared.

<Evaluation of laminate>
Each laminated film obtained in Example 1 and Comparative Example 1 was cut into a width of 15 mm and a length of 200 mm to obtain a test piece. The PET film and the polyethylene film were peeled off, and the peel strength at T was measured using a tensile tester (Tensilon RTC-125A, manufactured by Orientec Corp.). The tensile speed in this measurement was 50 mm / min. The measurement results were as shown in Table 2 below.

Each laminated film obtained in Example 1 and Comparative Example 1 was cut into a width of 15 mm and a length of 200 mm to obtain a test piece. The seal layer surfaces of the test pieces were bonded together by heat sealing. The peeled strength at the time of T was measured using a tensile tester (Tensilon RTC-125A, manufactured by Orientec Co., Ltd.). The sealing pressure in this measurement was 30 N / cm ² , the sealing time was 1 second, the sealing temperature was 170 ° C., and the tensile speed was 300 mm / min. The measurement was performed according to JIS Z1707. The measurement results were as shown in Table 2 below.

  Each laminated film obtained in Example 1 and Comparative Example 1 was used in an environment having a temperature of 23 ° C. and a humidity of 60 RH% using an oxygen permeability measuring device (OX-TRAN, manufactured by MOCON). Then, the oxygen permeability was measured. The measurement results were as shown in Table 2 below.

  Each laminated film obtained in Example 1 and Comparative Example 1 was subjected to a water vapor transmission rate measuring device (Permatran, manufactured by MOCON) in an environment of a temperature of 40 ° C. and a humidity of 90 RH%. The water vapor permeability was measured. The measurement results were as shown in Table 2 below.

Each standing pouch obtained in Example 1 and Comparative Example 1 was filled with 80 cc of water, and then the opening (upper edge) was sealed to prepare a standing pouch with water. The produced standing pouch with water was dropped upright from a height of 50 cm, and a drop impact test was performed. The measurement results were as shown in Table 2 below.

For each laminated film obtained in Example 2 and Comparative Example 2, the laminate strength, seal strength, and barrier values (oxygen permeability and water vapor permeability) were measured under the same conditions as described above, and a drop impact test was performed. . The measurement results were as shown in Table 3 below.

  As is clear from Tables 2 and 3, the barrier film having a base material layer made of polyethylene terephthalate film synthesized using biomass-derived ethylene glycol has a barrier property having a base material layer made of an existing polyester film. It turns out that it has the physical property which is inferior even if compared with a film.

DESCRIPTION OF SYMBOLS 10 Laminated body 11 Base material layer 12 Evaporation layer 13 Resin layer 14 Adhesive layer 15 Print layer 16 Resin layer 20 Laminate 21 Base material layer 22 Deposition layer 23 Resin layer 24 Adhesion layer 25 Resin layer

Claims (10)

A barrier film for packaging products having a base material layer, a vapor deposition layer formed on at least one surface of the base material layer, and a gas barrier coating film provided on the surface of the vapor deposition layer,
The base material layer is made of a resin film,
The resin film is
Biomass polyester resin with ethylene glycol derived from biomass as diol unit and terephthalic acid derived from fossil fuel as dicarboxylic acid unit , ethylene glycol derived from fossil fuel as diol unit, and terephthalic acid derived from fossil fuel as dicarboxylic acid unit And a polyester resin made of a fossil fuel-derived raw material ,
In the resin film, the biomass polyester resin is contained 50 to 95% by mass,
The deposited layer is made of a deposited film of silicon, aluminum, magnesium, calcium, potassium, tin, sodium, boron, titanium, lead, zirconium, yttrium, or an oxide thereof.
The gas barrier coating film has a general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence of M.), a polyvinyl alcohol-based resin, and at least one alkoxide represented by A barrier film for packaging products , comprising: an ethylene / vinyl alcohol copolymer. 2. The resin film according to claim 1, wherein the resin film further comprises a recycled polyester resin made of a fossil fuel-derived raw material having ethylene glycol derived from fossil fuel as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. Barrier film for packaging products . The barrier film for packaged products according to claim 1 or 2 , wherein the content of biomass-derived carbon as measured by radioactive carbon (C14) is 10 to 19% with respect to the total carbon in the resin composition. The barrier film for packaged products according to any one of claims 1 to 3 , wherein the base material layer is a biaxially stretched resin film. The barrier film for packaging products according to any one of claims 1 to 4 , wherein the vapor deposition layer is formed of a vapor deposition film of aluminum, aluminum oxide, or silicon oxide. The laminated film using the barrier film for packaged products as described in any one of Claims 1-5 . A packaging bag comprising the laminated film according to claim 6 . A method for producing a barrier film for packaging products , comprising: a base material layer; a vapor deposition layer formed on at least one surface of the base material layer; and a gas barrier coating film provided on the surface of the vapor deposition layer. ,
The base material layer is made of a resin film,
The resin film is
Biomass polyester resin with ethylene glycol derived from biomass as diol unit and terephthalic acid derived from fossil fuel as dicarboxylic acid unit, ethylene glycol derived from fossil fuel as diol unit, and terephthalic acid derived from fossil fuel as dicarboxylic acid unit And a polyester resin made of a fossil fuel-derived raw material,
In the resin film, 50 to 95% by mass of biomass polyester resin is contained,
The deposited layer is made of a deposited film of silicon, aluminum, magnesium, calcium, potassium, tin, sodium, boron, titanium, lead, zirconium, yttrium, or an oxide thereof.
The gas barrier coating film has a general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents a valence of M.), a polyvinyl alcohol-based resin, and at least one alkoxide represented by / Or ethylene vinyl alcohol copolymer,
The resin film,
The biomass polyester resin;
A polyester masterbatch comprising a polyester resin and porous silica;
A method for producing a barrier film for a packaged product, wherein the film is formed by melt extrusion molding. The method for producing a barrier film for packaged products according to claim 8 , wherein the deposited film is formed on at least one surface of the base material layer by physical vapor deposition or chemical vapor deposition. The resin film further includes a recycled polyester resin obtained by recycling a polyester resin made of a fossil fuel-derived raw material having ethylene glycol derived from fossil fuel as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. The manufacturing method of the barrier film for packaged products of Claim 8 or 9 which becomes.

Images