Fitting and bag with fitting

Abstract

To provide a fitting tool having low adsorbing ability of medicinal ingredients and flavor ingredients, being weldable to a bag body using a polyester film as an innermost layer and having openable / closable flexibility, and bag body with the fitting tool.SOLUTION: A fitting tool 10 attached to an inner surface of an opening part of a bag body to openably close the opening part, the fitting tool 10 is formed of a resin composition made of an amorphous polyester resin and a styrene elastomer, where a ratio of the amorphous polyester resin to the total mass of the resin composition is more than 80 mass% and 99 mass% or less, and a ratio of the styrene elastomer is 1 mass% or more and less than 20 mass%.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fitting and a bag with a fitting. [Background technology]

[0002] Bags with fittings, in which a fitting for freely closing an opening is attached to the inner surface of a bag body near the opening, are widely used in various fields such as food, medicine, and miscellaneous goods. An example of a fitting is one in which a pair of strip-shaped base materials have a first fitting portion and a second fitting portion that are detachably fitted to each other and are provided along the longitudinal direction of the base materials on the opposing surfaces of the respective base materials.

[0003] Olefin resin is generally used for bags with fittings. However, olefin resin is prone to adsorbing medicinal ingredients and flavor components. For this reason, polyester resin, which is less likely to adsorb medicinal ingredients and flavor components, is increasingly being used as the innermost layer of the bag body. However, it is not possible to weld an olefin resin fitting to a bag body with a polyester film as the innermost layer. Patent Document 1 discloses a bag with a fitting, which uses a fitting made of polyethylene terephthalate and polyester elastomer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-52551 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the fitting of Patent Document 1 is too hard to open and close, making it unsuitable for practical use. Also, if the amount of elastomer added to the fitting of Patent Document 1 is increased to improve its flexibility, the drug adsorption increases.

[0006] The present invention aims to provide a fitting and a bag body with a fitting that have low adsorption properties for medicinal ingredients and flavor ingredients, can be welded to a bag body having a polyester film as the innermost layer, and has flexibility that allows it to be opened and closed. [Means for solving the problem]

[0007] The present invention has the following aspects. [1] A fitting device that is attached to the inner surface of an opening of a bag body to close the opening freely, the fitting device being made of a resin composition consisting of an amorphous polyester resin and a styrene-based elastomer, the proportion of the amorphous polyester resin being more than 80% by mass and not more than 99% by mass, and the proportion of the styrene-based elastomer being 1% by mass or more and less than 20% by mass, relative to the total mass of the resin composition. [2] The fitting according to [1], wherein the dicarboxylic acid component of the amorphous polyester resin is at least one selected from terephthalic acid and isophthalic acid, and the diol component is at least one selected from ethylene glycol, propanediol, butanediol, diethylene glycol, and cyclohexanedimethanol. [3] The fitting according to [1] or [2], wherein the styrene-based elastomer has a styrene unit content of 40 mass% or less. [4] When immersed in a 10% ethanol solution of D-limonene and left at rest for 7 days at 25°C, the amount of D-limonene adsorbed per unit area was 80μg / cm 2 The fitting device according to any one of [1] to [3] below. [5] A bag body with a fitting comprising a bag body for accommodating contents and a fitting according to any one of [1] to [4] attached to the inner surface of the bag body. Effect of the Invention

[0008] According to the present invention, it is possible to provide a fitting and a bag body with a fitting that have low adsorption of medicinal ingredients and flavor ingredients, can be welded to a bag body having a polyester film as the innermost layer, and has flexibility that allows it to be opened and closed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic cross-sectional view of a fitting according to an embodiment. [Diagram 2] 1 is a schematic front view of a bag body with a fitting according to an embodiment; [Diagram 3] 3 is a schematic perspective view showing a state in which the bag with the fitting in FIG. 2 has been opened. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Fitting Tool] The fitting of the present invention is a fitting attached to the inner surface of an opening of a bag body to close the opening in an openable and closable manner. The fitting of the present invention is made of a resin composition containing an amorphous polyester resin and a styrene-based elastomer, and the proportion of the amorphous polyester resin is more than 80% by mass and not more than 99% by mass, and the proportion of the styrene-based elastomer is 1% by mass or more and less than 20% by mass, relative to the total mass of the resin composition.

[0011] An example of a fitting device of the present invention will be described below with reference to the drawings. Note that the dimensions of the drawings shown in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be appropriately modified and implemented without departing from the spirit and scope of the present invention.

[0012] As shown in FIG. 1, a fitting 10 according to the embodiment includes a pair of band-shaped first fitting member 12 and second fitting member 14 . The first fitting member 12 includes a band-shaped first base material 16 and a first fitting portion 18 in the form of a protrusion provided along the longitudinal direction on an opposing surface 16a of the first base material 16. The first base material 16 and the first fitting portion 18 are integrally molded. The second fitting member 14 includes a band-shaped second base material 20 and a second fitting portion 22 that is provided along the longitudinal direction on the opposing surface 20a of the second base material 20 and detachably fits into the first fitting portion 18. The second base material 20 and the second fitting portion 22 are integrally molded.

[0013] The first fitting portion 18 extends in the longitudinal direction of the first base material 16 on the opposing surface 16a of the first base material 16. The first fitting portion 18 includes a stem 18a rising from the opposing surface 16a of the first base material 16, and a head 18b provided at the tip of the stem 18a and having a substantially semicircular cross section larger than that of the stem 18a. That is, the first fitting portion 18 in this example is a male fitting portion.

[0014] The second fitting portion 22 extends in the longitudinal direction of the second base material 20 on the opposing surface 20a of the second base material 20. The second base material 20 is composed of a first arm portion 22a and a second arm portion 22b that rise in an arc shape from the opposing surface 20a so that their tips approach each other in a cross section cut in a direction perpendicular to the longitudinal direction of the second base material 20. A recess 22c that receives the head 18b of the first fitting portion 18 is formed on the inside of the first arm portion 22a and the second arm portion 22b of the second base material 20. That is, the second fitting portion 22 in this example is a female fitting portion.

[0015] The fitting 10 can be detachably fitted by fitting the head 18b of the first fitting portion 18 into the recess 22c of the second fitting portion 22. The cross-sectional shape of the first fitting portion 18 and the second fitting portion 22 when cut in a direction perpendicular to the longitudinal direction may be any shape that allows the opening of the bag body to be repeatedly opened and closed by attaching and detaching the first fitting portion 18 and the second fitting portion 22 to each other, and any known cross-sectional shape may be used without restriction.

[0016] The thickness of the first base material 16 can be set appropriately, and is preferably 0.1 mm to 0.4 mm, and more preferably 0.12 mm to 0.3 mm. If the thickness of the first base material 16 is equal to or greater than the lower limit, sufficient seal strength can be obtained when the fitting 10 is heat-welded to the bag body. If the thickness of the first base material 16 is equal to or less than the upper limit, sufficient flexibility can be obtained. A preferred embodiment of the thickness of the second substrate 20 is the same as that of the first substrate 16. The thicknesses of the first substrate 16 and the second substrate 20 may be the same or different.

[0017] The width of the first base material 16 is preferably 2 mm to 60 mm, more preferably 3 mm to 40 mm. If the width of the first base material 16 is equal to or greater than the lower limit, sufficient seal strength can be obtained when the fitting 10 is heat-sealed to the bag body. If the width of the first base material 16 is equal to or less than the upper limit, handling is easy and the fitting is less likely to deform during distribution and storage. A preferred embodiment of the width of the second substrate 20 is the same as that of the first substrate 16. The width of the first substrate 16 and the width of the second substrate 20 may be the same or different.

[0018] The material constituting the fitting 10 is a resin composition consisting of an amorphous polyester resin and a styrene-based elastomer. Note that "amorphous" means that there is no melting peak when the temperature is raised from -100°C to 300°C at a rate of 20°C / min using a differential scanning calorimeter (DSC).

[0019] An example of the amorphous polyester resin is an amorphous polyester resin obtained by polymerizing a dicarboxylic acid component and a diol component. Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, orthophthalic acid, adipic acid, azelaic acid, and sebacic acid. Among them, terephthalic acid and isophthalic acid are preferable. As the dicarboxylic acid component, one type may be used alone, or two or more types may be used in combination.

[0020] Examples of the diol component include ethylene glycol, propanediol, butanediol, pentanediol, neopentyl glycol, hexanediol, diethylene glycol, and cyclohexanedimethanol. Among them, ethylene glycol, propanediol, butanediol, diethylene glycol, and cyclohexanedimethanol are preferred, and ethylene glycol, 1,3-propanediol, 1,4-butanediol, diethylene glycol, and 1,4-cyclohexanedimethanol are more preferred. As the diol component, one type may be used alone, or two or more types may be used in combination.

[0021] From the viewpoint of moldability, the amorphous polyester resin is preferably an amorphous polyester resin in which the dicarboxylic acid component is at least one selected from terephthalic acid and isophthalic acid, and the diol component is at least one selected from ethylene glycol, propanediol, butanediol, diethylene glycol, and cyclohexanedimethanol, and more preferably glycol-modified polyethylene terephthalate. As the amorphous polyester resin, one type may be used alone, or two or more types may be used in combination.

[0022] As the styrene-based elastomer, an elastomer containing a structural unit (styrene unit) obtained by polymerizing styrene can be used. As the styrene-based elastomer, for example, a copolymer obtained by copolymerizing styrene with a monomer other than styrene can be exemplified. The copolymer may be a block copolymer or a random copolymer, and is preferably a block copolymer in that the effects of the present invention can be easily obtained.

[0023] The content of the styrene unit in the styrene elastomer is preferably 40% by mass or less, more preferably 5% by mass or more and 35% by mass or less, and even more preferably 10% by mass or more and 30% by mass or less, based on the total mass of all the constituent units of the styrene elastomer. If the content of the styrene unit is equal to or less than the upper limit, the flexibility is excellent and the bending is large, so that the fitting portion is unlikely to break or chip when the fitting tool is fitted or released. If the content of the styrene unit is equal to or more than the lower limit, the chemical resistance and heat fusion property are high.

[0024] Examples of styrene-based elastomers include styrene-butadiene-styrene copolymers (SBS), styrene-isoprene-styrene block copolymers (SIS), styrene-(ethylene / propylene) block copolymers (SEP), hydrogenated styrene-isoprene-styrene block copolymers (SEPS), styrene-(ethylene / butylene)-styrene block copolymers (SEBS), acid-modified hydrogenated styrene-(ethylene / butylene)-styrene block copolymers (A-SEBS), styrene-(ethylene-ethylene / propylene)-styrene block copolymers (SEEPS), styrene-isobutylene-styrene block copolymers (SIBS), hydrogenated styrene-butadiene rubber (HSBR), styrene-(ethylene / butylene)-pseudo polyethylene block copolymers (SEBC), partially hydrogenated styrene-butadiene-styrene block copolymers (SBBS), and styrene-butadiene copolymer resins (SBC). As the styrene-based elastomer, general purpose polystyrene (GPPS), high impact polystyrene (HIPS), etc. may be used. Among them, SEPS, SEBS, or SBBS is preferable from the viewpoint of flexibility. As the styrene-based elastomer, one type may be used alone, or two or more types may be used in combination.

[0025] The melt flow rate (MFR) of the styrene elastomer is preferably 1 g / 10 min to 20 g / 10 min, more preferably 2 g / 10 min to 18 g / 10 min. If the MFR of the styrene elastomer is equal to or higher than the lower limit, the base film is less likely to crack during the point sealing process. If the MFR of the styrene elastomer is equal to or lower than the upper limit, drawdown is less likely to occur during T-die extrusion molding. The MFR is measured in accordance with JIS K 6924-1 at a temperature of 190°C and a load of 2.16N.

[0026] The Shore A hardness of the styrene-based elastomer is preferably 30 or more and 80 or less, more preferably 30 or more and 70 or less. If the Shore A hardness of the styrene-based elastomer is equal to or more than the lower limit, the softening temperature is sufficiently high, the elastomer is stable to heat, and the elastomer can maintain its shape. If the Shore A hardness of the styrene-based elastomer is equal to or less than the upper limit, the elastomer has good point sealability and is less likely to crack the base film. The Shore A hardness is measured using a durometer type A in accordance with JIS K 6253.

[0027] As the styrene-based elastomer, commercially available products may be used. Specific examples include SEPS such as Septon 2063 and 2104 (manufactured by Kuraray Co., Ltd.), SBS such as Tufprene 126S (manufactured by Asahi Kasei Co., Ltd.), SBBS such as Tuftec P1500 (manufactured by Asahi Kasei Co., Ltd.), SEBS such as Tuftec H1221 and H1043 (manufactured by Asahi Kasei Co., Ltd.), A-SEBS such as Tuftec M1943 and M1911 (manufactured by Asahi Kasei Co., Ltd.), SBC such as Clearene MB910 and 880L (manufactured by Denka Co., Ltd.), GPPS such as Toyo Styrol G210C (manufactured by Toyo Styrene Co., Ltd.), and HIPS such as Toyo Styrol E640N (manufactured by Toyo Styrene Co., Ltd.).

[0028] The resin composition constituting the fitting 10 has a ratio of amorphous polyester resin of more than 80% by mass to 99% by mass or less and a ratio of styrene-based elastomer of 1% by mass or more to less than 20% by mass relative to the total mass of the resin composition. This reduces the adsorption of medicinal ingredients and flavor ingredients, while allowing the bag body having a polyester film as the innermost layer to be welded, and also provides sufficient flexibility to open and close the opening of the bag body.

[0029] The proportion of the amorphous polyester resin in the resin composition is preferably from 81% by mass to 97% by mass, and more preferably from 85% by mass to 95% by mass, based on the total mass of the resin composition. The proportion of the styrene-based elastomer in the resin composition is preferably from 3 mass % to 17 mass %, and more preferably from 5 mass % to 15 mass %, based on the total mass of the resin composition.

[0030] When the fitting 10 was immersed in a 10% D-limonene ethanol solution and left to stand at 25°C for 7 days, the amount of D-limonene adsorbed per unit area was 80 μg / cm 2 Less than 60 μg / cm is preferred 2 Less than 50 μg / cm is more preferable. 2 The following is even more preferred: The adsorption amount of D-limonene per unit area is measured by the method described in the Examples.

[0031] (Manufacturing method) The method for manufacturing the fitting 10 is not particularly limited, and for example, any known method can be used except for using the above-mentioned resin composition as the material for forming the first base material 16, the first fitting portion 18, the second base material 20, and the second fitting portion 22. For example, a method in which an amorphous polyester resin and a styrene-based elastomer are melt-kneaded, and the obtained resin composition is molded to obtain the first fitting member 12 or the second fitting member 14 can be exemplified.

[0032] Examples of the melt-kneading method include a method in which the raw materials are supplied to a melt-kneading machine such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader, or a mixing roll, and melt-kneaded. Examples of the molding method include extrusion molding, injection molding, inflation molding, and vacuum molding. It should be noted that the fitting of the present invention is not limited to the above-described fitting 10. For example, the fitting 10 may have the first base material 16 and the second base material 20 formed of multiple layers.

[0033] [Bag with fitting] The bag with a fitting of the present invention comprises a bag body that contains contents, and the fitting of the present invention attached to the inner surface of the bag body. The bag with a fitting of the present invention can adopt any known embodiment other than the inclusion of the fitting of the present invention.

[0034] As an example of the bag with a fitting of the present invention, a bag with a fitting 1 (hereinafter referred to as "bag 1") equipped with the above-mentioned fitting 10 will be described below. 2, the bag body 1 of this embodiment comprises a bag body 50 in a sealed state for accommodating contents, and a fitting 10 attached along the lateral direction to the inner surface of the upper part of the bag body 50. Note that the "lateral direction" of the bag body 1 means a direction parallel to the horizontal direction and parallel to the surface direction of the first film material 52 and the second film material 54 of the bag body 50 in the bag body 1 in a flat state with the side of the bag body 1 forming the opening facing up and the side opposite to the side forming the opening facing down, and coincides with the lateral direction of the paper in FIG. 2.

[0035] The bag body 50 is formed by overlapping a first film material 52 and a second film material 54 and heat sealing their entire peripheral edges 56 to form a sealed state. A cutting assistance line 58 is provided along the horizontal direction on the bag body 50 above the fitting 10, and a notch 60 is formed at the end of the line.

[0036] The fitting 10 has an outer surface 16d of the first base material 16 of the fitting 10 welded to the first film material 52 of the bag body 50, and an outer surface 20d of the second base material 20 of the fitting 10 welded to the second film material 54 of the bag body 50. The fitting 10 is attached such that the first side edge 16b of the first base material 16 and the first side edge 20b of the second base material 20 face the opening side, and the second side edge 16c of the first base material 16 and the second side edge 20c of the second base material 20 face the contents side.

[0037] The shape of the bag body 50 is rectangular in this embodiment. However, the shape of the bag body 50 is not limited to a rectangle. The size of the bag body 50 is also not particularly limited, and may be appropriately selected depending on the contents to be accommodated in the bag body 50.

[0038] The first film material 52 and the second film material 54 forming the bag body 50 may be any material capable of welding the fitting 10 by heat sealing, and may be, for example, a monolayer film made of polyester film, or a laminated film in which a base layer is laminated on the outside of a polyester film that is the innermost layer. The laminated film may further have a functional layer such as a barrier layer.

[0039] Examples of the polyester film include a polyethylene terephthalate film and a polyethylene naphthalate film. The thickness of the polyester film is preferably 5 μm to 50 μm, more preferably 10 μm to 40 μm. If the thickness of the polyester film is equal to or greater than the lower limit, the bag body is less likely to wrinkle. If the thickness of the polyester film is equal to or less than the upper limit, heat sealing is easy.

[0040] Examples of the base material layer include paper, biaxially oriented nylon, and biaxially oriented polypropylene. Paper containing pulp is preferable as the base material layer from the viewpoint of reducing the synthetic resin content of the bag body 1. Examples of papers containing pulp include fine paper, art paper, coated paper, pure white roll paper, one-sided gloss bleached kraft paper, special double-sided bleached kraft paper, and bleached kraft paper. The paper weight is 40g / m 2 More than 100g / m 2 Less than 50 g / m is preferable. 2 More than 70g / m 2 The following is more preferred: An example of a laminated film having a paper substrate layer is laminated paper.

[0041] The cutting assist line 58 is a line that assists in cutting the bag body 50 above the fitting 10 to open the bag. Examples of the cutting assist line 58 include a weakened line in which the first film material 52 and the second film material 54 of the bag body 50 are made thinner at the portion of the cutting assist line 58 than the other portions, a weakened line made of perforations, and a weakened line made of small holes formed in a row. Furthermore, the cutting assist line 58 is not limited to the weakened line described above, and may be a line formed by printing or the like that indicates the position to cut with scissors, a cutter, or the like. In this embodiment, the cutting assistance line 58 is formed along the lateral direction of the bag body 50, but is not limited to this form and may be provided at an angle to the lateral direction of the bag body 50.

[0042] The shape of the notch 60 is triangular in this example, but is not particularly limited thereto, and may be semicircular, linear, or the like. The bag body 1 can be manufactured by a known method except for using the fitting 10.

[0043] When opening the bag body 1, the upper part of the bag body 50 is cut and removed from the notch 60 along the cutting assist line 58, forming an opening 62 at the upper part, as shown in Fig. 3, and the bag can be opened. The opening 62 formed in the bag body 1 can be repeatedly opened and closed by attaching and detaching the first fitting portion 18 and the second fitting portion 22 of the fitting tool 10.

[0044] The bag with a fitting of the present invention is not limited to the above-mentioned bag 1. For example, the bag with a fitting of the present invention may be a bag with a fitting provided with a fitting of the present invention other than the fitting 10 as described above. The bag body of the bag with a fitting is not particularly limited, and various forms of bag bodies known as bag bodies of bags with a fitting can be used. For example, the bag body 1 is a sealed bag until it is opened using the cutting assist line 58, but it may be a bag with a fitting having a bag body with an opening formed in advance. In addition, it is possible to appropriately replace the components in the above embodiment with well-known components without departing from the spirit of the present invention, and the above-mentioned modified examples may be appropriately combined. EXAMPLES

[0045] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following description.

[0046] [Abbreviation] PETG-1: glycol-modified polyethylene terephthalate (product name "SKYGREEN P-SF", manufactured by SK Chemicals Corporation, dicarboxylic acid component: 100 mol% terephthalic acid, diol component: 68 mol% ethylene glycol, 22 mol% 1,4-cyclohexanedimethanol, 10 mol% diethylene glycol) PET-1: Polyethylene terephthalate (product name "A-12", manufactured by Eastman Chemical Company) SBBS-1: styrene-based thermoplastic elastomer (product name "Tuftec P1500", Asahi Kasei Corporation, styrene-butadiene / butylene-styrene block copolymer (partially hydrogenated styrene-butadiene-styrene block copolymer), density: 0.94 g / cm 3 , styrene unit content: 30 mass%, MFR (temperature 190°C, load 2.16 kg): 4.0 g / 10 min, Shore A hardness: 69, tensile strength: 3.3 MPa, tensile elongation: 780%, tensile stress: 2.1 MPa, solution viscosity (15 mass% toluene): 35 mPa s) TPEE-1: Thermoplastic polyester elastomer (product name "Pelprene P-30B", manufactured by Toyobo Co., Ltd.)

[0047] [Example 1] A composite irregular die was prepared for molding a fitting having the same aspect as the fitting 10 illustrated in Fig. 1. Using an extruder with a bore of 50 mm and L / D of 30, PETG-1 and SBBS-1 were melt-kneaded in a mass ratio of 99:1 at a molding temperature of 180 to 250°C to obtain a resin composition, which was then introduced into the composite irregular die for extrusion molding. The resin composition was then introduced into a cooling water tank for cooling and solidification, to obtain a fitting having a first substrate and a second substrate with a width of 6 mm and a thickness of 0.1 mm.

[0048] [Examples 2 to 5] A fitting was obtained in the same manner as in Example 1, except that the formulation of the resin composition was changed as shown in Table 1.

[0049] [Comparative Examples 1 to 7] A fitting was obtained in the same manner as in Example 1, except that the formulation of the resin composition was changed as shown in Table 2.

[0050] [Moldability] The moldability in extrusion molding of each example was evaluated according to the following criteria. <Evaluation criteria> ◯: The shape of the fitting was stably formed. Δ: The shape of the fitting was unstable or the thickness of the base material was uneven. ×: The shape of the fitting was unstable and the base material was torn.

[0051] [Thermal adhesiveness] <Heat fusion method> The first fitting portion (male fitting portion) was cut out from the first substrate of the first fitting member of each fitting device, and a sample piece 6 mm wide and 25 cm long was cut out from the first substrate. The sample piece and a polyester film 6 mm wide and 27 cm long (DE046, 30 μm thick, manufactured by Flex Co., Ltd.) were overlapped so that the surface of the sample piece opposite to the side where the male fitting portion was provided was in contact with the polyester film. Next, a thermal gradient tester manufactured by Toyo Seiki Seisakusho was used to fuse the sample piece and the polyester film in an area 6 mm wide and 10 cm long, leaving 8.5 cm on one end side in the longitudinal direction, to obtain a test piece. The fusion conditions of the thermal gradient tester were a fusion temperature of 130° C. and a fusion pressure of 1.0 kgf / cm. 2 (98 kPa) and fusion time of 1.0 seconds. The same procedure was repeated to obtain 20 test pieces. <Fusion strength measurement> The fusion strength was measured by clamping the unfused portion of the polyester film and the substrate of the test piece in a Strograph tensile tester manufactured by Toyo Seiki Seisakusho Co., Ltd., and conducting a T-peel test at a tensile speed of 200 mm / min. The maximum peel force (gf / 6 mm) was determined for each of the 20 test pieces, and the arithmetic average of the maximum peel force (gf / 6 mm) was taken as the fusion strength. Based on the fusion strength measured in each example, the heat fusion property to the polyester film was evaluated according to the following evaluation criteria. <Evaluation criteria> 〇: 300gf / 6mm or more. ×:Less than 300gf / 6mm.

[0052] [Flexibility] A sample of 120 mm in length was cut out from the first fitting member of each fitting example along the longitudinal direction of the first substrate, and pulled using a tensile tester manufactured by Toyo Seiki Seisakusho, with the chuck distance of 50 mm and a pulling speed of 1 mm / min until the elongation reached 1.0 mm, and the tensile load during this period was measured. The measured tensile load was divided by the cross-sectional area of ​​the sample to determine the stress σ (MPa). The cross-sectional area was calculated by measuring the cross-sectional area (cm2) of the first fitting member using an optical microscope. 2 In addition, the amount of elongation ΔL (mm) was divided by the chuck distance L (mm) to obtain the strain ε, and the stress σ (MPa) was divided by the strain ε to obtain the tensile modulus E (MPa). Based on the tensile modulus E measured for each example, flexibility was evaluated according to the following criteria. <Evaluation criteria> Good: Moderate flexibility and rigidity, easy to handle. (100 MPa or more, but less than 2000 MPa) ×: High rigidity, not suitable for use as a fitting member (over 2000 MPa).

[0053] [Adsorption (chemical resistance)] Three test pieces, each 3 cm long, were cut out from the first fitting member having the male fitting portion of each fitting device along the longitudinal direction of the first substrate. A 10% ethanol solution of D-limonene was placed in a 20 mL sample bottle as a chemical, and the test piece was immersed in the chemical and allowed to stand at 25°C for 7 days. The test piece was removed, the excess solution was wiped off with a paper wiper (manufactured by Nippon Paper Crecia, product name Kimwipe), and the test piece was immersed in 10 mL of ethanol in another test tube, and the chemical adhering to the surface of the test piece was extracted into ethanol using a 40 kHz ultrasonic generator. Next, D-limonene in the extract was identified by GC / MS (Thermo Fisher "ITQ-1100"), and the amount of D-limonene was determined by an FID detector. The amount of D-limonene in the extract (μg) was calculated based on the surface area (cm2) of the test piece. 2 The amount of adsorption per unit area was calculated by dividing the surface area of ​​the test piece by the surface area (cm 2 ) = perimeter of test piece (cm) × length of test piece (cm) Note that a cross section perpendicular to the longitudinal direction of the test piece was observed using an optical microscope, and the length of the outline was measured and used as the perimeter of the test piece (cm). Based on the amount of D-limonene adsorbed per unit area measured in each example, the adsorption was evaluated according to the following criteria. <Evaluation criteria> 〇: Adsorption amount per unit area is 80μg / cm 2 below. ×: Adsorption amount per unit area 80μg / cm 2 Super.

[0054] The composition of the resin composition and the evaluation results of each example are shown in Tables 1 and 2.

[0055] [Table 1]

[0056] [Table 2]

[0057] As shown in Tables 1 and 2, Examples 1 to 5, which used resin compositions combining amorphous polyester resin and styrene-based elastomer in specific ratios, had excellent moldability, heat fusion properties with polyester film, and flexibility, and had low adsorption of D-limonene. On the other hand, in Comparative Example 1, in which only PET-1 was used, a fitting could not be molded. In Comparative Example 2, in which only amorphous polyester resin was used, flexibility was poor. In Comparative Examples 3, 4, 6, and 7, in which the ratio of amorphous polyester resin to styrene-based elastomer was outside the range of the present invention, the amount of D-limonene adsorbed was large. Furthermore, in Comparative Examples 3 and 4, the heat fusion property to polyester film was poor, and in Comparative Examples 5 to 7, the moldability was poor. [Explanation of symbols]

[0058] 1...bag body with fitting, 10...fitting, 12...first fitting member, 14...second fitting member, 16...first base material, 18...first fitting portion, 20...second base material, 22...second fitting portion, 50...bag body.

Claims

1. A fitting that is attached to the inner surface of an opening of a bag body and closes the opening freely, the fitting is made of a resin composition comprising an amorphous polyester resin and a styrene-based elastomer, The fitting has a proportion of the amorphous polyester resin greater than 80% by mass and less than 99% by mass, and a proportion of the styrene-based elastomer greater than or equal to 1% by mass and less than 20% by mass, relative to the total mass of the resin composition.

2. 2. The fitting according to claim 1, wherein the dicarboxylic acid component of the amorphous polyester resin is at least one selected from terephthalic acid and isophthalic acid, and the diol component is at least one selected from ethylene glycol, propanediol, butanediol, diethylene glycol, and cyclohexanedimethanol.

3. 3. The fitting according to claim 1, wherein the styrene-based elastomer has a styrene unit content of 40 mass % or less.

4. When immersed in a 10% D-limonene ethanol solution and left at rest for 7 days at 25°C, the amount of D-limonene adsorbed per unit area was 80 μg / cm ２ The fitting according to any one of claims 1 to 3, wherein:

5. A bag body with a fitting comprising: a bag body for accommodating contents; and the fitting according to any one of claims 1 to 4 attached to an inner surface of the bag body.

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