WO2022004769A1 - Zip fastener tape and packaging with zip fastener tape - Google Patents

Abstract

A zip fastener tape (3) is provided with: first resin portions (41, 51) that are formed from a first resin composition having a first polyester resin as a main component, and include a pair of base section strips (a first base section strip (42) and a second base section strip (52)) and engaging sections (a male engaging section (43) and a female engaging section (53)), the engaging section being capable of engaging each other, and each protruding out from mutually opposing surfaces of the pair of base section strips; and second resin portions (44, 54) that are formed from a second resin composition having a second polyester resin as a main component, and that cover each of the surfaces opposite the engaging sections of the pair of base section strips. The first resin composition contains a first modifying agent at a first content ratio. The second resin composition either contains the first modifying agent at a second content ratio, which is lower than the first content ratio, or does not contain the first modifying agent.

Description

Zipper tape and container with zipper tape

The present invention relates to a zipper tape and a container with a zipper tape.

Conventionally, a bag with a zipper to which a zipper member is welded is known (see, for example, Patent Document 1).
The zipper member described in Patent Document 1 is composed of a female zipper tape welded to one inner surface of a bag with a zipper and a male zipper tape welded to the other inner surface. The zipper member can be welded to the heat-sealing polyethylene terephthalate (HS-PET) resin layer of the bag body, and the polyethylene terephthalate (PET) is intended to have flexibility in order to exert the function of the zipper. ) It is formed of a mixed resin in which another resin is mixed with the resin.
Specifically, in Patent Document 1, as the first mixed resin forming the zipper member, a mixed resin of 30 to 80% by weight of PET resin and 20 to 70% by weight of polyester-based thermoplastic elastomer is mentioned. Further, as the second mixed resin forming the zipper member, a compatibilizer is added to 40 to 80% by weight of PET resin and 20 to 60% by weight of low density polyethylene (LDPE) resin or linear low density polyethylene (LLDPE) resin. The mixed resin to which is added is mentioned.

Japanese Unexamined Patent Publication No. 2017-52551

As in the example of Patent Document 1 above, by setting the content of PET resin in the resin composition to a predetermined ratio or less, it is possible to provide flexibility suitable for a zipper. However, in this case, it is difficult to obtain sufficient sealing strength between the zipper member and the HS-PET sealant. Increasing the content of PET resin in the resin composition can increase the sealing strength between the zipper member and the HS-PET sealant, but it becomes difficult to obtain flexibility suitable for the zipper.

One of the objects of the present invention is to provide a zipper tape and a container with a zipper tape, which can obtain a sufficient sealing strength with an HS-PET sealant while having flexibility suitable for a zipper.

According to a certain aspect of the present invention, it is formed of a first resin composition containing a first polyester resin as a main component, and projects from a pair of base strips and the pair of base strips facing each other and engages with each other. A first resin portion including a possible engaging portion and a second resin composition containing a second polyester resin as a main component are formed, and the surfaces of the pair of base strips opposite to the engaging portion are respectively. The first resin composition comprises a second resin portion for covering, the first resin composition contains the first modifier at a first content, and the second resin composition contains the first modifier. Zipper tapes are provided that contain a second content lower than the content or do not contain the first modifier.

According to another aspect of the present invention, a container with a zipper tape comprising the zipper tape and a container body into which the zipper tape is welded is provided.

The plan view which shows the container with the zipper tape which concerns on one Embodiment of this invention. FIG. 1 is a sectional view taken along line II-II of the container with zipper tape shown in FIG. The figure which shows the angle of the male type engaging part and the dimension of the 2nd member in the container with a zipper tape which concerns on one Embodiment. The graph which shows the measurement result of the tensile elastic modulus of a plurality of test pieces formed by the resin composition containing a modifier in one Example of this invention. The graph which shows the measurement result of the tensile elastic modulus of the resin composition containing the ethylene / methacrylic acid / acrylic acid ester copolymer in one Example of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals, and duplicate description will be omitted.
In the present specification, the main component means the most abundant component among the components of the resin composition. More specifically, when the resin composition is composed of a polymer having n components (n is an integer of 2 or more), it contains 100 / n% or more, preferably 100 / n × 1.2 times or more. The main component is the component. The main component can be analyzed by infrared spectroscopy, NMR, DSC, or the like. Impurities may be contained in the resin composition as long as the effects of the present invention are not lost.

Hereinafter, the container 1 with a zipper tape according to the present embodiment will be described.
FIG. 1 is a plan view showing a container 1 with a zipper tape. FIG. 2 is a diagram showing a cross section of a container 1 with a zipper tape in line II-II shown in FIG.
As shown in FIGS. 1 and 2, the container 1 with a zipper tape includes a container body 2 which is a bag body having a first surface 21 and a second surface 22 facing each other, and a zipper tape 3.

[Container body configuration]
The container body 2 is made of a film 20. The film 20 has at least one layer formed of, for example, a thermoplastic resin.
The film 20 may include a layer made of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). The PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 20 is a multilayer film, biaxially stretched polypropylene (OPP), biaxially stretched polyethylene terephthalate (OPET), or biaxially stretched nylon (ONy) may be used as the surface substrate.
Further, the film 20 may include a layer of an inorganic material formed by vapor deposition of aluminum, lamination of aluminum foil, or the like. In the present embodiment, the portion where the zipper tape 3 is welded on each of the first surface 21 and the second surface 22 is a sealant formed of a resin composition containing heat-sealing polyethylene terephthalate (HS-PET) as a main component. Layers 211,221. That is, the container body 2 has a sealant layer 211,221 formed of a resin composition containing heat-sealable PET as a main component.
The material of the film 20 is not limited to the fossil fuel-derived resin, and an environment-friendly bioplastic may be used, or a mixture of the fossil fuel-derived resin and the bioplastic may be used.

In the present embodiment, the two films 20 are joined to each other at the bottom seal portion 23 and the side seal portion 24 to form a bag having the first surface 21 and the second surface 22. In another embodiment, one film 20 may be folded back at a portion corresponding to the side seal portion 24 to form a bag having the first surface 21 and the second surface 22. Alternatively, a portion in which the film 20 is folded inward, a so-called gusset, may be formed at a portion corresponding to the bottom seal portion 23 or the side seal portion 24 in the example of FIG. In this case, the gusset may be formed by the film 20 or by another film bonded to the film 20.
Further, the container 1 with a zipper tape may be a standing pouch that can be placed upright by forming a gusset on the bottom.

Further, in the present embodiment, the bottom seal portion 23 and the side seal portion 24 are formed, but the top seal portion is not formed, so that the opening 11 of the container 1 with the zipper tape is formed. In another embodiment, a top seal portion is formed in addition to the bottom seal portion 23 and the side seal portion 24, and the opening 11 is formed in the container 1 with the zipper tape by cutting between the top seal portion and the zipper tape 3. It may be possible to form after the fact. In yet another embodiment, the bottom seal portion 23 is not formed, that is, the portion opposite to the zipper tape 3 is not sealed with respect to the accommodation space S formed inside the container 1 with the zipper tape. The bag may be provided in the state. In this case, the bottom seal portion 23 is formed after the contents are filled in the storage space S of the container 1 with the zipper tape. In addition to these, the present invention can be applied to a known bag and a known container other than the bag as long as the zipper tape 3 is welded.

[Zipper tape configuration]
As shown in FIG. 2, the zipper tape 3 includes a first member 4 welded to the first surface 21 of the film 20 and a second member 5 welded to the second surface 22.
The first member 4 includes a first resin portion 41 and a second resin portion 44. The first resin portion 41 has a first base strip piece 42 and a male engaging portion 43 which is an engaging portion. The male engaging portion 43 projects from the surface of the first base strip 42 facing the second base strip 52. The tip portion 431 of the male engaging portion 43 will be described in detail later. On the other hand, the second resin portion 44 covers the surface of the first base strip 42 opposite to the surface on which the male engaging portion 43 is provided. The second resin portion 44 forms a joint portion 4A between the first member 4 and the first surface 21 of the film 20.

The upper limit of the thickness of the second resin portion 44 is preferably 100 μm or less, more preferably 50 μm or less, and further preferably 40 μm or less. The lower limit value is not particularly limited, but is usually preferably 0.1 μm or more, and more preferably 1 μm or more. As will be described in detail later, since the content of the modifier in the second resin portion 44 is lower than the content of the modifier in the first resin portion 41, the rigidity of the second resin portion 44 is the rigidity of the first resin. It is higher than the rigidity of the portion 41. However, within this range, it is possible to prevent the zipper tape 3 from becoming too rigid, and thus it is possible to reduce the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3.
The mass ratio of the second resin portion 44 to the first resin portion 41 is preferably 0.1 or more, and more preferably 1% or more. The mass ratio of the second resin portion 44 to the first resin portion 41 is preferably 30% or less, more preferably 20% or less. Since the content of the modifier in the second resin portion 44 is lower than the content of the modifier in the first resin portion 41, the rigidity of the second resin portion 44 is higher than the rigidity of the first resin portion 41. It gets higher. However, within this range, it is possible to prevent the zipper tape 3 from becoming too rigid, and thus it is possible to reduce the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3.

The second member 5 includes a first resin portion 51 and a second resin portion 54. The first resin portion 51 has a second base strip piece 52 and a female engaging portion 53 constituting the engaging portion. The second base strip 52 constitutes a pair of base strips together with the first base strip 42. The female engaging portion 53 protrudes from the surface of the second base strip 52 facing the first base strip 42. The female engaging portion 53 can be engaged with the male engaging portion 43. That is, the female engaging portion 53 has a first hook portion 531 and a second hook portion 532 which are a pair of hook-shaped portions facing each other and capable of receiving the male engaging portion 43. On the other hand, the second resin portion 54 covers the surface of the second base strip 52 opposite to the surface on which the female engaging portion 53 is provided. The second resin portion 54 forms a joint portion 5A between the second member 5 and the second surface 22 of the film 20.

The upper limit of the thickness of the second resin portion 54 is preferably 100 μm or less, more preferably 50 μm or less, and further preferably 40 μm or less. The lower limit value is not particularly limited, but is usually preferably 0.1 μm or more, and more preferably 1 μm or more. As will be described in detail later, since the content of the modifier in the second resin portion 54 is lower than the content of the modifier in the first resin portion 51, the rigidity of the second resin portion 54 is the rigidity of the first resin. It is higher than the rigidity of the portion 41. However, within this range, it is possible to prevent the zipper tape 3 from becoming too rigid, thereby reducing the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3. can.
The mass ratio of the second resin portion 54 to the first resin portion 51 is preferably 0.1 or more, and more preferably 1% or more. The mass ratio of the second resin portion 54 to the first resin portion 51 is preferably 30% or less, more preferably 20% or less. Since the content of the modifier in the second resin portion 54 is lower than the content of the modifier in the first resin portion 41, the rigidity of the second resin portion 54 is higher than the rigidity of the first resin portion 51. It gets higher. However, within this range, it is possible to prevent the zipper tape 3 from becoming too rigid, and thus it is possible to reduce the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3.

In the zipper tape 3 according to the present embodiment, a first base strip including a pair of base strips 42 and a second base strip 52, and a male engaging portion 43 and a female engaging portion 53. The resin portions 41 and 51 are formed of a first resin composition containing a first polyester resin as a main component. On the other hand, in the first base strip 42 and the second base strip 52, the second resin portions 44 and 54 covering the surfaces opposite to the male engaging portion 43 and the female engaging portion 53, respectively, are made of second polyester. It is formed of a second resin composition containing a resin as a main component. Here, examples of the first polyester resin and the second polyester resin include polyethylene terephthalate (PET). Further, the first polyester resin and the second polyester resin may be environmentally friendly biopolyester resins. Examples of the biopolyester resin include "RAMA PET N1B" manufactured by INDORAMA. Further, the first polyester resin and the second polyester resin may be the same type of polyester resin, or may be different types of polyester resins.

The first resin composition constituting the first resin portions 41 and 51 contains a modifier (first modifier) having an effect of lowering the tensile elastic modulus at the first content rate, as will be described later. In the present embodiment, the first content is 10% by mass or more. The first content is preferably 15% by mass or more, more preferably 25% by mass or more. In addition, the first content is preferably 80% by mass or less, more preferably 70% by mass or less, further preferably 60% by mass or less, and particularly preferably 50% by mass or less. On the other hand, the second resin composition constituting the second resin portions 44, 54 contains the same type of modifier as the modifier contained in the first resin composition, which is lower than the first content. Contains or does not contain modifiers. When the second resin composition contains a modifier, the second content is 50% by mass or less. The second content is preferably 30% by mass or less, more preferably 10% by mass or less. When the second resin composition contains the same kind of modifier as the modifier (first modifier) contained in the first resin composition, the second content is a value exceeding 0% by mass. It should be.

Here, from the viewpoint of extrudability during manufacturing of the zipper tape, the content of the modifier contained in the first resin composition is 10% by mass or more and 45% by mass or less, or 55% by mass or more and 80% by mass or less. It is preferable to have. More preferably, the content of the modifier is 25% by mass or more and 40% by mass or less, or 57% by mass or more and 75% by mass or less.
In addition, in this specification, the content ratio of a specific component with respect to a resin composition means the ratio of the specific component with respect to the whole of the resin composition including the specific component.

In another example, the second resin composition replaces the modifier contained in the first resin composition with a modifier of a different type from the modifier contained in the first resin composition (first). 2 Modifier) may be contained in a third content lower than the first content. In this case, the third content is 50% by mass or less of the second resin composition. The third content is preferably 30% by mass or less, more preferably 10% by mass or less. The third content may be a value exceeding 0% by mass.
In addition to the modifier (first modifier) contained in the first resin composition, the second resin composition is a different type of modifier (second modifier) from the first modifier. The total content of the modifier (total of the second content and the third content) is lower than the first content and is 50% by mass or less. The total content of the modifier is preferably 30% by mass or less, more preferably 10% by mass or less. The total content of the modifiers may be a value exceeding 0% by mass.
However, it is preferable that the second resin composition does not contain the modifier as compared with the case where the second resin composition contains the modifier.

The above-mentioned modifiers (first modifier and second modifier) are substances having an effect of lowering the tensile elastic modulus of the polyester resin. Specifically, the modifier is, for example, any one of polyester-based elastomer, ionomer resin, acid-modified polyolefin, styrene-based elastomer, polyethylene, polyolefin-based elastomer, ethylene-vinyl acetate copolymer (EVA), or two of these. It may be a mixture of seeds or more. As the ionomer resin, an ethylene / methacrylic acid / acrylic acid ester copolymer is preferable.
As the polyethylene, linear low density polyethylene (LLDPE) is preferable.
That is, as described above, even if the modifier (first modifier) contained in the first resin composition and the modifier (second modifier) contained in the second resin composition are the same. Well, it may be different. The modifier (first modifier) contained in the first resin composition is the modifier (second modifier) contained in the second resin composition and at least one other modification. It may be a mixture with a pledge agent. Similarly, the modifier (second modifier) contained in the second resin composition includes the modifier (first modifier) contained in the first resin composition and at least one other type. It may be a mixture with a modifier.

The zipper tape 3 described above is formed, for example, by coextruding the first resin composition and the second resin composition. In the zipper tape 3 after welding to the film 20, it may not be possible to clearly distinguish between the layer of the first resin portion 41 and the layer of the second resin portion 44, and the layer of the first resin portion 51 may not be clearly distinguished. It may not be possible to clearly distinguish between the layer and the layer of the second resin portion 54.

The first resin portions 41, 51 are formed of the first resin composition having a relatively high content of the modifier, and the second resin portions 44, 54 have a relatively low content of the modifier, or By being formed of the second resin composition containing no modifier, the tensile elastic modulus of the first resin portions 41 and 51 is higher than the tensile elastic modulus of the second resin portions 44 and 54. The tensile elastic modulus of the first resin portions 41, 51 is, for example, 100 MPa or more, preferably 200 MPa or more, more preferably 500 MPa or more, still more preferably 710 MPa or more, particularly preferably 770 MPa or more, and even more preferably 860 MPa or more. It is more preferably 1000 MPa or more. The tensile elastic modulus is 1400 MPa or less, preferably 1300 MPa or less, and more preferably 1200 MPa or less. As a result, the male engaging portion 43 and the female engaging portion 53 that engage with each other can be flexibly formed, and the function of the zipper can be fully exerted. Further, when the tensile elastic modulus of the first resin portions 41 and 51 is 100 MPa or more, the engagement strength between the male engagement portion 43 and the female engagement portion 53 is improved, and the male engagement portion 43 and the female The holding of the engaged state with the mold engaging portion 53 is improved.

The shapes of the male type engaging part 43 and the female type engaging part 53, which are the engaging parts, are not limited to the male type and the female type, and may be a known shape in which a claw shape, a hook shape, a knob shape, or the like is combined. It can also be applied to the engaging portion of the first member 4 and the second member 5. Further, two or more sets of engaging portions may be provided on the first member 4 and the second member 5. In either case, the engaging portion is a deformed portion protruding from the first base strip 42 and the second base strip 52 having a substantially rectangular cross section. In order to maintain the shape of such a deformed portion, to securely seal the opening 11 when the engaging portion is engaged, and to develop an appropriate opening feeling when the engaging portion is disengaged. , It is preferable that the elastic modulus of the first resin portions 41 and 51 is a value within the above range.

On the other hand, when the resin composition containing a polyester resin as a main component contains a modifier, the sealing strength of the resin layer formed of the resin composition with respect to the layer containing the heat-sealing PET resin is the modifier. It is lower than the sealing strength of the resin layer formed of the resin composition containing no. That is, when a modifier is added, there is a trade-off relationship between the elastic modulus and the seal strength.
On the other hand, in the present embodiment, even when the modifier is contained in the second resin composition, the content of the modifier is the content of the first modifier in the first resin composition (first content). It is lower than the rate) and less than 30% by mass. As a result, it is possible to suppress a decrease in the sealing strength of the second resin portions 44 and 54. More specifically, the sealing strength of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 can be, for example, 10 N / 15 mm or more, preferably 15 N / 15 mm or more, and more preferably 20 N / 15 mm or more. Further, the sealing strength of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 is, for example, 100 N / 15 mm or less. Therefore, the second resin portions 44 and 54 can be firmly welded to the sealant layers 211 and 221.

On the other hand, when the resin composition containing a polyester resin as a main component does not contain a modifier, the sealing strength of the resin layer formed of the resin composition with respect to the layer containing the heat-sealing PET resin as described above. Tends to be higher than the seal strength of the resin layer formed of the resin composition containing the modifier. The elastic modulus of the resin layer formed of the resin composition containing the polyester resin as the main component and not containing the modifier is higher than the elastic modulus of the resin layer formed of the resin composition containing the modifier. Also tends to be large. Therefore, by using a resin composition containing no modifier for the seal layer, it is possible to form a seal layer having high shape stability and high seal strength. In particular, by adopting a layer formed of a resin composition containing no modifier for the laminate forming the seal layer, high seal strength and high shape stability can be imparted to the seal layer.

[Angle of the tip of the male engaging part]
FIG. 3 is a cross-sectional view showing a container 1 with a zipper tape in a state where the male engaging portion 43 and the female engaging portion 53 are engaged with each other.
As shown in FIG. 3, the tip portion 431 in the protruding direction of the male engaging portion 43 from the first base strip piece 42 is formed in a substantially triangular shape. In the present embodiment, the tip angle of the male engaging portion 43, that is, the angle α of the tip portion 431 is an angle in the range of 60 ° or more and 130 ° or less. More specifically, the angle α is the intersection angle between the tangent line L1 of the portion on the opening 11 side of the tip portion 431 and the tangent line L2 of the portion of the tip portion 431 on the accommodation space S side. According to the findings of the present inventors, the angle α is preferably 75 ° or more, more preferably 90 ° or more. The angle α is preferably 120 ° or less, more preferably 110 ° or less.
This makes it easier to insert the male engaging portion 43 into the concave engaging portion 53, and the elastic modulus of the first resin composition forming the male engaging portion 43 is relatively low. Even if there is, the function of the zipper can be fully exhibited.

[Thickness dimension of the second member in the female engaging part]
Further, as shown in FIG. 3, in the present embodiment, the minimum thickness LE of the portion in the female engaging portion 53 in the second member 5 is 0.1 mm or more and 1.0 mm or less in the present embodiment. More specifically, the minimum thickness LE of the second member 5 is the second member in the region sandwiched between the first hook portion 531 and the second hook portion 532, which are a pair of hook-shaped portions in the width direction of the zipper tape 3. It is a dimension in the direction from 5 toward the first member 4. According to the findings of the present inventors, the minimum thickness LE is preferably 0.2 mm or more, more preferably 0.3 mm or more. The minimum thickness LE is preferably 0.8 mm or less, more preferably 0.6 mm or less.
This makes it possible to easily displace the female engaging portion 53 when the male engaging portion 43 is inserted. Therefore, the male engaging portion 43 can be easily inserted into the female engaging portion 53, and the opening 11 of the container 1 with the zipper tape can be easily sealed.

[Effect of embodiment]
The container 1 with a zipper tape according to the present embodiment described above has the following effects.
The zipper tape 3 was formed by the first resin portions 41 and 51 formed of the first resin composition containing the first polyester resin as a main component and the second resin composition containing the second polyester resin as a main component. The second resin portions 44 and 54 are provided. The first resin portion 41 includes a first base strip 42 constituting a pair of base strips, and a male engaging portion 43 projecting from a surface of the first base strip 42 facing the second base strip 52. , Have. The first resin portion 51 includes a second base strip 52 constituting the pair of base strips, and a female engaging portion 53 protruding from the surface of the second base strip 52 facing the first base strip 42. , Have. The male type engaging portion 43 and the female type engaging portion 53 are engaging portions that can be engaged with each other. The second resin portion 44 covers the surface of the first base strip 42 opposite to the male engaging portion 43. The second resin portion 54 covers the surface of the second base strip 52 opposite to the female engaging portion 53.
The first resin composition contains the first modifier at the first content. The second resin composition contains the first modifier at a second content lower than the first content, or does not contain the first modifier.

According to such a configuration, the first resin portion 41 having the male type engaging portion 43 and the first resin portion 51 having the female type engaging portion 53 contain the first modifier at the first content rate. Contains. According to this, the male type engaging portion 43 and the female type engaging portion 53 that can be engaged with each other can be flexibly formed, and the engagement of the male type engaging portion 43 and the female type engaging portion 53 can be enhanced. can.
As described above, as the content of the modifier in the second resin portions 44 and 54 increases, the first surface 21 and the second surface 22 which are the inner surfaces of the container body 2 containing the heat-sealing PET resin become the first. 2 The sealing strength of the resin portions 44 and 54 decreases. On the other hand, the second resin portions 44 and 54 contain the first modifier at a second content lower than the first content, or do not contain the first modifier. Therefore, it is possible to suppress a decrease in the sealing strength of the second resin portions 44 and 54 with respect to the first surface 21 and the second surface 22.
Therefore, it is possible to configure the zipper tape 3 which is flexible and has high sealing strength.

In the zipper tape 3, the first polyester resin and the second polyester resin may be the same type of polyester resin.
According to such a configuration, it is not necessary to significantly change the polyester resin constituting the zipper tape 3 between the first resin portions 41 and 51 and the second resin portions 44 and 54. Therefore, the zipper tape 3 can be easily manufactured.

In the zipper tape 3, when the first polyester resin and the second polyester resin are the same type of polyester resin, the same type of polyester resin may be polyethylene terephthalate (PET).
According to such a configuration, the zipper tape 3 having excellent strength, chemical resistance and transparency can be configured.

In the zipper tape 3, the first modifier is composed of at least one of polyester-based elastomer, ionomer resin, acid-modified polyolefin, styrene-based elastomer, polyethylene, polyolefin-based elastomer, and ethylene-vinyl acetate copolymer (EVA). May be.
By containing such a modifier as the first modifier in the first resin composition, the zipper tape 3 exhibiting the above effect can be formed.

In the zipper tape 3, the first content may be 10% by mass or more.
According to such a configuration, the tensile elastic modulus of the first resin composition containing the first polyester resin and the first modifier can be lowered. Therefore, the male engagement portion 43 and the female engagement portion 53, which are the engagement portions, can be flexibly displaced, and the engagement between the male engagement portion 43 and the female engagement portion 53 can be enhanced. can.

In the zipper tape 3, the second resin composition contains the first modifier at the second content, and the second content may be 50% by mass or less.
According to such a configuration, the content of the first modifier contained in the second resin portions 44 and 54 can be reduced. Thereby, for example, it is possible to suppress a decrease in the sealing strength of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 on the inner surface of the container body 2. Further, since the second resin composition contains the same first modifier as the first resin composition, it is possible to facilitate the production of the zipper tape.

In the zipper tape 3, the second resin composition may not contain the first modifier.
According to such a configuration, the composition of the first resin composition and the composition of the second resin composition can be simplified, the manufacturing cost of the zipper tape 3 can be reduced, and the first surface which is the inner surface of the container body 2 can be reduced. The sealing strength of the second resin portions 44 and 54 with respect to the 21 and the second surface 22 can be increased.

In the zipper tape 3, the second resin composition does not contain the first modifier and contains a second modifier different from the first modifier at a third content lower than the first content. You may.
According to such a configuration, the content of the second modifier contained in the second resin composition can be lowered, so that, for example, the seals of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 of the container body 2 are sealed. It is possible to suppress a decrease in strength.

In the zipper tape 3, the third content may be 50% by mass or less.
According to such a configuration, the second resin composition does not contain the first modifier, but contains the second modifier in a third content of 50% by mass or less. As a result, the content of the modifier contained in the second resin portions 44 and 54 can be lowered, so that it is possible to suppress a decrease in the sealing strength of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 of the container body 2, for example. ..

In the zipper tape 3, the second resin composition may contain the first modifier at the second content and also contain the second modifier different from the first modifier at the third content. good. In this case, the total of the second content and the third content may be lower than the first content and may be 50% by mass or less.
According to such a configuration, even when the second resin composition contains the first modifier and the second modifier, the content of the modifier contained in the second resin portions 44 and 54 can be reduced. .. Therefore, for example, it is possible to suppress a decrease in the sealing strength of the second resin portion with respect to the sealant layers 211 and 221 of the container body 2.

In the zipper tape 3, the second modifier may consist of at least one of polyester-based elastomer, ionomer resin, acid-modified polyolefin, styrene-based elastomer, polyethylene, polyolefin-based elastomer, and EVA.
By containing such a modifier as the second modifier in the second resin composition, the zipper tape 3 exhibiting the above effect can be formed.

In the zipper tape 3, the pair of base strips of the first resin portions 41 and 51 is possessed by the first base strip 42 of the first resin portion 41 and the first resin portion 51, and the first base portion. It may consist of a second base strip 52 facing the strip 42. In this case, the engaging portion of the first resin portions 41, 51 may include the male engaging portion 43 and the female engaging portion 53. The male engaging portion 43 may be provided on the first base strip 42 and may protrude from the first base strip 42 toward the second base strip 52. The female engaging portion 53 may be provided on the second base strip 52 and may protrude from the second base strip 52 toward the first base strip 42.
According to such a configuration, the male engaging portion 43 is inserted into the female engaging portion 53, so that the engaged state between the first base strip 42 and the second base strip 52 is, by extension,. The engaged state of the zipper tape 3 can be maintained.

In the zipper tape 3, the tip angle of the male engaging portion 43 may be 60 ° or more and 130 ° or less. That is, the angle α of the tip portion 431 in the protruding direction of the male engaging portion 43 from the first base strip piece 42 may be 60 ° or more and 130 ° or less. In this case, the angle α may be preferably 75 ° or more, more preferably 90 ° or more. Further, the angle α is preferably 120 ° or less, and more preferably 110 ° or less.
According to such a configuration, the male engaging portion 43 can be easily inserted into the female engaging portion 53. Further, the male engaging portion 43 inserted into the female engaging portion 53 can be made difficult to disengage from the female engaging portion 53.

The zipper tape 3 may include a first member 4 and a second member 5. The first member 4 has a first base strip 42, a male engaging portion 43, and a second resin portion 44 covering a surface of the first base strip 42 opposite to the male engaging portion 43. .. The second member 5 has a second base strip 52, a female engaging portion 53, and a second resin portion 54 covering the surface of the second base strip 52 opposite to the female engaging portion 53. .. The female engaging portion 53 has a first hook portion 531 and a second hook portion 532 facing each other. The first hook portion 531 and the second hook portion 532 correspond to a pair of hook-shaped portions. In the region sandwiched between the first hook portion 531 and the second hook portion 532 in the width direction of the zipper tape 3, the minimum thickness LE of the second member 5 may be 0.1 mm or more and 1.0 mm or less. The minimum thickness LE may be preferably 0.2 mm or more, more preferably 0.3 mm or more. The minimum thickness LE is preferably 0.8 mm or less, and more preferably 0.6 mm or less.
According to such a configuration, the female engaging portion 53 can be easily displaced when the male engaging portion 43 is inserted, so that the male engaging portion 43 can be easily inserted into the female engaging portion 53. can do.

The zipper tape 3 may include a first member 4 and a second member 5. The first member 4 has a first base strip 42, a male engaging portion 43, and a second resin portion 44 covering a surface of the first base strip 42 opposite to the male engaging portion 43. .. The second member 5 has a second base strip 52, a female engaging portion 53, and a second resin portion 54 covering the surface of the second base strip 52 opposite to the female engaging portion 53. .. The thickness of the second resin portion 44 may be 100 μm or less, and the thickness of the second resin portion 54 may be 100 μm or less.
According to such a configuration, it is possible to prevent the zipper tape 3 from becoming too rigid, so that it is possible to reduce the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3.

The zipper tape 3 may include a first member 4 and a second member 5. The first member 4 has a first base strip 42, a male engaging portion 43, and a second resin portion 44 covering a surface of the first base strip 42 opposite to the male engaging portion 43. .. The second member 5 has a second base strip 52, a female engaging portion 53, and a second resin portion 54 covering the surface of the second base strip 52 opposite to the female engaging portion 53. .. The mass ratio of the second resin portion 44 to the first resin portion 41 may be 0.1% or more and 30% or less. The mass ratio of the second resin portion 54 to the first resin portion 51 may be 0.1% or more and 30% or less.
According to such a configuration, it is possible to prevent the zipper tape 3 from becoming too rigid, so that it is possible to reduce the breakage and disengagement of the zipper tape 3 during manufacturing and bag making of the zipper tape 3.

In the zipper tape 3, the tensile elastic modulus of the first resin portions 41 and 51 may be 100 MPa or more and 1400 MPa or less. The tensile elastic modulus of the first resin portions 41, 51 may be preferably 200 MPa or more, more preferably 500 MPa or more, still more preferably 710 MPa or more, and particularly preferably 860 MPa or more. Further, the tensile elastic modulus of the first resin portions 41 and 51 may be 1400 MPa or less, preferably 1300 MPa or less, and more preferably 1200 MPa or less.
According to such a configuration, the male type engaging portion 43 and the female type engaging portion 53 that engage with each other can be flexibly formed. Therefore, the male engaging portion 43 and the female engaging portion 53 can be easily engaged with each other. For example, as described above, when the tensile elastic modulus of the first resin portions 41 and 51 is 100 MPa or more, the engagement strength between the male type engaging portion 43 and the female type engaging portion 53 is improved, and the male type engaging portion is engaged. The holding of the engaged state between the joint portion 43 and the female engaging portion 53 is improved.

The container 1 with a zipper tape includes a zipper tape 3 and a container body 2 to which the zipper tape 3 is welded.
According to such a configuration, a container 1 with a zipper tape having the same effect as that of the zipper tape 3 can be configured.

In the container 1 with a zipper tape, the container body 2 is formed of a resin composition containing heat-sealing polyethylene terephthalate (PET) as a main component, and has a sealant layer 211,221 to which the second resin portions 44 and 54 are welded. You may be doing it. In this case, the sealing strength of the second resin portions 44, 54 with respect to the sealant layer 211,221 may be higher than the sealing strength of the first resin portions 41,51 with respect to the sealant layer 211,221.
According to such a configuration, the zipper tape 3 is welded to the sealant layers 211 and 221 of the container body 2 to form the container 1 with the zipper tape, whereby the functionality of the PET layer and the functionality of the zipper tape 3 can be obtained. It can be compatible.
Further, since the sealing strength of the second resin portions 44,54 with respect to the sealant layer 211,221 is higher than the sealing strength of the first resin portions 41,51 with respect to the sealant layer 211,221, the sealant layer 211,221 is the first. 2 Resin portions 44 and 54 can be stably welded. Therefore, the zipper tape 3 can be stably fixed to the container body 2.

In the container 1 with a zipper tape, the sealing strength of the second resin portions 44, 54 with respect to the sealant layers 211 and 221 may be 10 N / 15 mm or more. The sealing strength of the second resin portions 44 and 54 can be 100 N / 15 mm or less.
According to such a configuration, the second resin portions 44 and 54 can be firmly welded to the container body 2. Therefore, the zipper tape 3 can be stably fixed to the container body 2.

In the container 1 with a zipper tape, the container body 2 may be a bag body.
According to such a configuration, a bag-shaped container that can be opened and closed can be configured.

[Modification example]
The present invention is not limited to the above-described embodiment, and modifications and improvements within the range in which the object of the present invention can be achieved are included in the present invention.
The first resin composition contained the first modifier at the first content rate, and the first content rate was set to a value of 10% by mass or more. However, depending on the composition of the first modifier, the first content may be a value larger than 0% by mass, and may not necessarily be a value of 10% by mass or more.

When the second resin composition contains the first modifier, the second content of the first modifier is lower than the first content and is 50% by mass or less. When the second resin composition contains the second modifier, the third content of the second modifier is lower than the first content and is 50% by mass or less. When the second resin composition contains the first modifier and the second modifier, the total of the second content of the first modifier and the third content of the second modifier is the first content. It was assumed that the value was lower than the rate and was 50% by mass or less. However, the content of the modifier in the second resin composition does not necessarily have to be 50% by mass or less as long as it is lower than the content of the modifier in the first resin composition. When the second resin composition contains the first modifier, the second content of the first modifier is preferably lower than the first content and preferably 40% by mass or less. When the second resin composition contains the second modifier, the third content of the second modifier is preferably lower than the first content and preferably 40% by mass or less. When the second resin composition contains the first modifier and the second modifier, the total of the second content of the first modifier and the third content of the second modifier is the first content. It is preferably a value lower than the rate and 40% by mass or less.

The first modifier and the second modifier are exemplified above. However, if it reduces the tensile elastic modulus of the first resin composition containing the first polyester resin as a main component and the tensile elastic modulus of the second resin composition containing the second polyester resin as a main component, the first The composition of the 1 modifier and the composition of the 2nd modifier are not limited to the above.

The angle α of the tip portion 431 of the male engaging portion 43 is not limited to the above range and can be changed.
In the region sandwiched between the first hook portion 531 and the second hook portion 532, which are a pair of hook-shaped portions, the minimum thickness LE of the second member 5 is not limited to the above range and can be changed.
The tensile elastic modulus of the first resin portions 41 and 51 is not limited to the above range and can be changed.
The sealing strength of the second resin portions 44 and 54 with respect to the sealant layers 211 and 221 is not limited to the above range and can be changed.

[Example]
Regarding the container 1 with the zipper tape described above, the sealing strength of the second resin composition with respect to the sealant layer formed by the resin composition containing heat-sealing PET as a main component, and the first resin composition depending on the type of modifier. The elastic modulus of the above and the ease of engagement between the male engaging portion 43 and the female engaging portion 53 based on the values of the angle α and the minimum thickness LE were evaluated.

[Heat sealability]
Using a "heat tilt tester" manufactured by Toyo Seiki Seisakusho Co., Ltd., a modifier containing polyethylene terephthalate (PET) (extreme viscosity: 0.88 dl / g, melting point 225 ° C.) as a main component as a polyester resin and the modifier shown below was used. A sample film formed of the contained resin composition and a target film formed of a resin composition containing heat-sealing PET as a main component are sealed with a sealing time of 1.0 second, a sealing pressure of 0.2 MPa, and a sealing temperature of 220 ° C. Sealed with, and an evaluation sample was obtained. For the evaluation sample, the heat seal strength (N / 15 mm) between the sample film and the target film per 15 mm width was measured using a “digital force gauge” manufactured by Imada. The tensile speed at the time of measuring the seal strength was set to 300 mm / min.

In Table 1 shown below, the sample film of Example 1 is a film containing 100% by mass of a PES (polyether sulphon) resin and not containing a modifier.
The sample film of Example 2 contains 30% by mass of a PES-based elastomer as a modifier.
The sample film of Example 3 contains 50% by mass of a PES-based elastomer as a modifier.
The sample film of Example 4 contains an ionomer resin, an ethylene / methacrylic acid / acrylic acid ester copolymer, in an amount of 15% by mass as a modifier.
The sample film of Example 5 contains an ionomer resin, an ethylene / methacrylic acid / acrylic acid ester copolymer, in an amount of 30% by mass as a modifier.
The sample film of Example 6 contains 60% by mass of an ionomer resin ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier.

As shown in Table 1, PET is the main component of the evaluation sample of Example 1 in which the sample film containing 100% by mass of PES resin and the target film are sealed without containing a modifier. The evaluation sample of Example 2 in which the sample film formed of the resin composition containing 30% by mass of the PES-based elastomer as the modifier and the target film are sealed, and the modifier whose main component is PET. In the evaluation sample of Example 3 in which the sample film formed of the resin composition containing 50% by mass of the PES-based elastomer and the target film were sealed, the sealing strength was lowered. Such a tendency is found in, for example, a sample film containing the ethylene / methacrylic acid / acrylic acid ester copolymer shown in Examples 4 to 6 as a modifier, or a sample film containing another modifier. The same can be seen in the evaluation sample sealed with the target film.
On the other hand, when the content of the modifier contained in the resin composition forming the sample film is 50% by mass or less, the sample film for the target film formed of the resin composition containing heat-sealable PET as a main component. It was found that the seal strength of the above can secure the seal strength that can be used as the zipper tape 3 welded to the sealant layers 211 and 221.
That is, by setting the content of the modifier contained in the second resin composition to 50% by mass or less, the zipper tape 3 could be firmly welded to the sealant layers 211 and 221.

Here, the seal strength of the sample film shown in Example 4, that is, the sample film containing 15% by mass of an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier is shown in Example 1. The sample film, that is, the sample film shown in Examples 2, 3, 5 and 6 is lower than the seal strength of the sample film which does not contain a modifier and contains 100% by mass of PES resin. It was higher than the seal strength. Therefore, it was confirmed that the seal layer having the composition shown in Example 4 is more useful as the seal layer when the laminated structure is formed.
From this, for example, a laminate of a layer containing an ethylene / methacrylic acid / acrylic acid ester copolymer and a PET-only layer (a layer not containing an ethylene / methacrylic acid / acrylic acid ester copolymer) is formed into a film. By sealing to, a better sealing layer for the film can be constructed.

[Tension modulus]
FIG. 4 is a graph showing the measurement results of the tensile elastic modulus of a plurality of test pieces formed of the resin composition containing the modifier.
Next, the tensile elastic modulus of the test piece containing each modifier was measured. An autograph AGSH-500N (Shimadzu Corporation) was used for the measurement.
The target for measuring the tensile elastic modulus is a test piece having a width of 3.5 mm and a length of 150 mm cut out from a base strip of a zipper tape formed of a resin composition having the composition shown below. The chuck distance of the tensile tester was set to 100 mm, the test piece was pulled under the condition of a tensile speed of 500 mm / min, and the tensile load was measured until the elongation amount reached 0.8 mm. The stress (MPa) was obtained by dividing the measured tensile load by the cross-sectional area obtained from the width and thickness of the test piece. Further, the elongation amount (mm) was divided by the inter-chuck distance (mm) to obtain the strain ε, and the stress σ (MPa) was divided by the strain ε to obtain the tensile elastic modulus (MPa). The measurement atmosphere is a temperature of 23 ° C. and the relative humidity is 50%.

The test pieces to be measured are a test piece formed of a resin composition containing 100% by mass of PES resin as in Example 1 above, and a resin composition containing 30% by mass of PES-based elastomer as a modifier. A test formed from a resin composition containing 15% by mass, 30% by mass, 45% by mass, and 60% by mass of a saponified EVA resin classified as an ethylene vinyl acetate copolymer (EVA). Piece, a test piece formed of a resin composition containing 30% by mass of a styrene-based elastomer (SEBS type), 15% by mass, 30% by mass, 45 of an ionomer resin, an ethylene / methacrylic acid / acrylic acid ester copolymer. A test piece formed of a resin composition containing mass% and 60% by mass, a test piece formed of a resin composition containing 30% by mass and 45% by mass of an olefin-based elastomer classified as a polyolefin-based elastomer, and A test piece formed of a resin composition containing 30% by mass of an olefin-based elastomer and 5% by mass of a compatibilizer.
The main component of each resin composition is PET.

As shown in FIG. 4, the tensile elastic modulus of the test piece formed of the resin composition containing 100% by mass of PES resin was approximately 1600 MPa. Since the resin composition having such a composition is relatively hard, when the first resin portions 41 and 51 having such a composition are formed, the engagement between the male engaging portion 43 and the female engaging portion 53 is possible. Is not good.
On the other hand, when the first resin portions 41 and 51 are formed of a resin composition having a tensile elastic modulus of less than 100 MPa, the first resin portions 41 and 51 are too soft and the male engaging portion 43 and the female engaging portion 43 are formed. The engagement with 53 is not good.
From these facts, in order to impart appropriate flexibility to the male type engaging portion 43 and the female type engaging portion 53, the tensile elastic modulus of the first resin composition forming the first resin portions 41, 51 is determined. , 100 MPa or more, preferably 1400 MPa or less.

FIG. 5 is a graph showing the measurement results of the tensile elastic modulus of the resin composition containing an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier.
On the other hand, in the case of a resin composition containing an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier, the ethylene / methacrylic acid / acrylic acid ester copolymer when the tensile elasticity is 100 MPa or more and 1400 MPa or less. As shown in FIG. 5, the content of ethylene is about 15% by mass or more. Further, since the tensile elasticity of the resin composition containing 30% by mass of the PES-based elastomer is lower than the tensile elasticity of the resin composition containing 30% by mass of the ethylene / methacrylic acid / acrylic acid ester copolymer. When the tensile elasticity of the resin composition containing the PES-based elastomer is 1400 MPa or less, the content of the PES-based elastomer is estimated to be 10% by mass or more. This also applies to the resin composition containing an olefin-based elastomer.
As described above, depending on the type of the modifier to be added, the content of the modifier in the resin composition is 10% by mass or more, so that the tensile elastic modulus of the resin composition is 100 MPa or more and 1400 MPa or less. Can be done.

In addition, in order to improve the engagement between the male engaging portion 43 and the female engaging portion 53, it is also necessary to impart appropriate hardness to the male engaging portion 43 and the female engaging portion 53. be. From this, the tensile elastic modulus of the resin composition forming the first resin portion 41 on which the male engaging portion 43 is formed and the first resin portion 51 on which the female engaging portion 53 is formed is preferable. Is 200 MPa or more, more preferably 500 MPa or more, further preferably 710 MPa or more, particularly preferably 770 MPa or more, still more preferably 860 MPa or more, still particularly preferably 1000 MPa or more. The tensile elastic modulus of the resin composition forming the first resin portions 41 and 51 is preferably 1300 MPa or less, more preferably 1200 MPa or less.
For example, when the first resin composition forming the first resin portions 41, 51 contains an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier, as shown in FIG. 5, ethylene / methacrylic acid / By setting the content of the acrylic acid ester copolymer to 30% by mass or more and 45% by mass or less, the tensile elasticity of the first resin portions 41 and 51 can be set to 1000 MPa or more and 1200 MPa or less.

[Angle of the tip of the male engaging part]
Next, the ease of engagement between the male engaging portion 43 and the female engaging portion 53 due to the angle α of the tip portion 431 was evaluated. The evaluation targets are Examples 7 and 8 shown below.
Example 7 is a zipper tape having first resin portions 41, 51 formed of a resin composition containing PET as a main component and an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier in an amount of 30% by mass. The angle α of the tip portion 431 of the male engaging portion 43 is 99 °.
Example 8 is a zipper tape 3 having first resin portions 41, 51 formed of a resin composition containing PET as a main component and EVA as a modifier in an amount of 30% by mass, and the male engaging portion 43. The angle α of the tip portion 431 of the above is 109 °.

With each of the zipper tape 3 of Example 7 and the zipper tape 3 of Example 8, the male type engaging portion 43 and the female type engaging portion 53 could be easily engaged with each other. That is, it was found that the male engaging portion 43 and the female engaging portion 53 can be easily engaged when the angle α is 99 ° or 109 °.

[Minimum thickness of the second member in the female engaging part]
Next, the ease of engagement between the male engaging portion 43 and the female engaging portion 53 based on the value of the minimum thickness LE was evaluated. The evaluation targets are Examples 9 and 10 shown below.
Example 9 is a zipper tape having first resin portions 41, 51 formed of a resin composition containing PET as a main component and an ethylene / methacrylic acid / acrylic acid ester copolymer as a modifier in an amount of 30% by mass. 3 is the zipper tape 3 having the above-mentioned minimum thickness LE of 0.307 mm.
Example 10 was the zipper tape 3 having the first resin portions 41 and 51 formed of a resin composition containing PET as a main component and EVA as a modifier in an amount of 30% by mass, which was the above-mentioned minimum thickness LE. Is a zipper tape 3 having a size of 0.433 mm.

With each of the zipper tape 3 of Example 9 and the zipper tape 3 of Example 10, the male type engaging portion 43 and the female type engaging portion 53 could be easily engaged with each other. That is, it was found that when the minimum thickness LE is 0.307 mm or 0.433 mm, the male type engaging portion 43 and the female type engaging portion 53 can be easily engaged with each other.

[Summary of the present invention]
Hereinafter, a summary of the present invention will be added.
[1] The zipper tape is formed of a first resin composition containing a first polyester resin as a main component, and projects from a pair of base strips and the pair of base strips facing each other and can engage with each other. A first resin portion including an engaging portion and a second resin composition containing a second polyester resin as a main component, each covering a surface of the pair of base strips opposite to the engaging portion. The first resin composition comprises two resin portions, the first resin composition contains the first modifier at the first content, and the second resin composition contains the first modifier at the first content. It contains a lower second content or does not contain the first modifier.

According to such a configuration, since the first resin portion having the engaging portion contains the first modifier at the first content rate, the engaging portion capable of engaging with each other can be flexibly formed. The engagement of the engaging portion can be enhanced.
Here, when the second resin portion is welded to the inner surface of the container body containing the heat-sealing PET resin, the second resin with respect to the inner surface of the container body as the content of the modifier in the second resin portion increases. The sealing strength of the portion is reduced. On the other hand, the second resin portion contains the first modifier at a second content lower than the first content, or does not contain the first modifier, so that the second resin portion has a second content with respect to the inner surface of the container body. It is possible to suppress a decrease in the sealing strength of the resin portion.
Therefore, it is possible to construct a zipper tape that is flexible and has high sealing strength.

[2] In the zipper tape according to [1], the first polyester resin and the second polyester resin may be the same type of polyester resin.
According to such a configuration, it is not necessary to significantly change the polyester resin constituting the zipper tape between the first resin portion and the second resin portion. Therefore, the zipper tape can be easily manufactured.

[3] In the zipper tape according to [2], the polyester resin of the same type may be polyethylene terephthalate (PET).
According to such a configuration, since the first resin composition and the second resin composition are resin compositions containing polyethylene terephthalate (PET) as a main component, the zipper tape is excellent in strength, chemical resistance and transparency. Can be configured.

[4] In the zipper tape according to any one of [1] to [3], the first modifier is a polyester elastomer, an ionomer resin, an acid-modified polyolefin, a styrene elastomer, polyethylene, or a polyolefin elastomer. , Ethylene-vinyl acetate copolymer (EVA) may consist of at least one or more.
By containing such a modifier as the first modifier in the first resin composition, a zipper tape exhibiting the above effect can be formed.

[5] In the zipper tape according to any one of [1] to [4], the first content may be 10% by mass or more.
According to such a configuration, the tensile elastic modulus of the first resin composition containing the first polyester resin and the first modifier can be lowered. Therefore, the engaging portion can be flexibly and displaceably configured, and the engagement of the engaging portion can be improved.

[6] In the zipper tape according to any one of [1] to [5], the second resin composition contains the first modifier at the second content and the second content. The rate may be 50% by mass or less.
According to such a configuration, the content of the first modifier contained in the second resin portion can be lowered. Thereby, for example, it is possible to suppress a decrease in the sealing strength of the second resin portion with respect to the inner surface of the container body. Further, since the second resin composition contains the same first modifier as the first resin composition, it is possible to facilitate the production of the zipper tape.

[7] In the zipper tape according to any one of [1] to [5], the second resin composition may not contain the first modifier.
With such a configuration, the composition of the second resin composition can be simplified, the manufacturing cost of the zipper tape can be reduced, and the sealing strength of the second resin portion with respect to the inner surface of the container body can be increased. Further, since the elastic modulus of the second resin composition can be made larger, the shape stability of the second resin portion can be improved.

[8] In the zipper tape according to any one of [1] to [5], the second resin composition does not contain the first modifier and is different from the first modifier. The second modifier may be contained in a third content lower than the first content.
According to such a configuration, the content of the second modifier contained in the second resin composition can be lowered, so that the decrease in the sealing strength of the second resin portion with respect to the container body can be suppressed, for example.

[9] In the zipper tape according to [8], the third content may be 50% by mass or less.
According to such a configuration, the second resin portion does not contain the first modifier and contains the second modifier in a third content of 50% by mass or less. As a result, similarly to the above, the content of the modifier contained in the second resin portion can be lowered, so that it is possible to suppress, for example, a decrease in the sealing strength of the second resin portion with respect to the inner surface of the container body.

[10] In the zipper tape according to any one of [1] to [5], the second resin composition contains the first modifier at the second content and the first. A second modifier different from the modifier is contained in the third content rate, and the total of the second content rate and the third content rate is lower than the first content rate and is 50% by mass or less. May be.
According to such a configuration, even when the second resin composition contains the first modifier and the second modifier, the content of the modifier contained in the second resin portion can be reduced. Therefore, for example, it is possible to suppress a decrease in the sealing strength of the second resin portion with respect to the container body.

[11] In the zipper tape according to any one of [8] to [10], the second modifier is a polyester elastomer, an ionomer resin, an acid-modified polyolefin, a styrene elastomer, polyethylene, or a polyolefin elastomer. , Ethylene-vinyl acetate copolymer (EVA) may consist of at least one or more.
By containing such a modifier as the second modifier in the second resin composition, a zipper tape exhibiting the above effect can be formed.

[12] In the zipper tape according to any one of [1] to [11], the pair of base strips includes a first base strip and a second base strip facing the first base strip. The engaging portion is composed of a piece, and the engaging portion is provided on the first base strip, and a male engaging portion that protrudes from the first base strip toward the second base strip and the second base strip. It may include a female engaging portion provided on the base strip, protruding from the second base strip toward the first base strip and engaging with the male engaging portion.
According to such a configuration, by inserting the male engaging portion into the female engaging portion, it is possible to maintain the engaged state of the pair of base strips, and thus the engaged state of the zipper tape.

[13] In the zipper tape according to [12], the tip angle of the male engaging portion may be 60 ° or more and 130 ° or less.
According to such a configuration, it is possible to easily insert the male engaging portion into the female engaging portion. Further, the male engaging portion inserted into the female engaging portion can be made difficult to disengage from the female engaging portion.

[14] In the zipper tape according to [12] or [13], the first base strip, the male engaging portion, and the first base strip opposite the male engaging portion. The first member having the second resin portion covering the surface of the surface, the second base strip, the female engaging portion, and the second base strip on the opposite side of the female engaging portion. A second member having the second resin portion covering the surface, the female engaging portion includes a pair of hook-shaped portions facing each other, and the pair of hook-shaped portions in the width direction of the zipper tape. The minimum thickness of the second member may be 0.1 mm or more and 1.0 mm or less in the region sandwiched between the two members.
According to such a configuration, the female engaging portion can be easily displaced when the male engaging portion is inserted, so that the male engaging portion can be easily inserted into the female engaging portion. ..

[15] In the zipper tape according to any one of [12] to [14], the male engaging portion in the first base strip, the male engaging portion, and the first base strip. The first member having the second resin portion covering the surface opposite to the portion, the second base strip, the female engaging portion, and the female engaging portion in the second base strip. A second member having the second resin portion covering the surface opposite to the surface thereof is provided, and the thickness of the second resin portion may be 100 μm or less.
According to such a configuration, it is possible to prevent the zipper tape from becoming too rigid, so that it is possible to reduce the breakage and disengagement of the zipper tape during the manufacturing and bag making of the zipper tape.

[16] In the zipper tape according to any one of [12] to [15], the male engaging portion in the first base strip, the male engaging portion, and the first base strip. The first member having the second resin portion covering the surface opposite to the portion, the second base strip, the female engaging portion, and the female engaging portion in the second base strip. The second member having the second resin portion covering the surface opposite to the first resin portion is provided, and the mass ratio of the second resin portion to the first resin portion is 0.1% or more and 30% or less. You may.
According to such a configuration, it is possible to prevent the zipper tape from becoming too rigid, so that it is possible to reduce the breakage and disengagement of the zipper tape during the manufacturing and bag making of the zipper tape.

[17] In the zipper tape according to any one of [1] to [16], the tensile elastic modulus of the first resin portion may be 100 MPa or more and 1400 MPa or less.
According to such a configuration, the male type engaging portion and the female type engaging portion that engage with each other can be flexibly formed. Therefore, the male engaging portion and the female engaging portion can be easily engaged.

[18] A container with a zipper tape, comprising the zipper tape according to any one of [1] to [17], and a container body into which the zipper tape is welded.
According to such a configuration, a container with a zipper tape having the same effect as the above zipper tape can be configured.

[19] In the container with zipper tape according to [18], the container body is formed of a resin composition containing heat-sealing polyethylene terephthalate (PET) as a main component, and the second resin portion is welded to the sealant. It has a layer, and the sealing strength of the second resin portion with respect to the sealant layer may be higher than the sealing strength of the first resin portion with respect to the sealant layer.
According to such a configuration, the function of the PET layer is obtained by welding the zipper tape to the sealant layer formed of the resin composition containing the heat-sealing PET as the main component in the container body to form the container with the zipper tape. It is possible to achieve both the sex and the functionality of the zipper tape.
Further, since the sealing strength of the second resin portion with respect to the sealant layer is higher than the sealing strength of the first resin portion with respect to the sealant layer, the second resin portion can be stably welded to the sealant layer. Therefore, the zipper tape can be stably fixed to the container body.

[20] In the container with the zipper tape according to [19], the sealing strength of the second resin portion with respect to the sealant layer may be 10 N / 15 mm or more.
According to such a configuration, the second resin portion can be firmly welded to the container body. Therefore, the zipper tape can be stably fixed to the container body.

[21] In the container with a zipper tape according to any one of [18] to [20], the container body may be a bag body.
According to such a configuration, a bag-shaped container that can be opened and closed can be configured.

1 ... Container with zipper tape, 2 ... Container body, 3 ... Zipper tape, 4 ... First member, 41 ... First resin part, 42 ... First base strip, 43 ... Male engaging part, 44 ... Second Resin part, 5 ... 2nd member, 51 ... 1st resin part, 52 ... 2nd base strip, 53 ... female type engaging part, 531: 1st hook part (hook-shaped part), 532 ... 2nd hook part (Hook-shaped part), 54 ... Second resin part.

Claims (21)

1. A first resin composition containing a first polyester resin as a main component, including a pair of base strips and engaging portions that project from the facing surfaces of the pair of base strips and engage with each other. With the resin part,
   A second resin portion formed of a second resin composition containing a second polyester resin as a main component and covering the surfaces of the pair of base strips opposite to the engaging portion, respectively.
   Equipped with
   The first resin composition contains the first modifier at the first content.
   The second resin composition is a zipper tape containing the first modifier at a second content lower than the first content, or containing no first modifier.
2. The zipper tape according to claim 1, wherein the first polyester resin and the second polyester resin are the same type of polyester resin.
3. The zipper tape according to claim 2, wherein the polyester resin of the same type is polyethylene terephthalate (PET).
4. The first modifier comprises at least one of a polyester elastomer, an ionomer resin, an acid-modified polyolefin, a styrene elastomer, polyethylene, a polyolefin elastomer, and an ethylene-vinyl acetate copolymer (EVA), according to claim 1. The zipper tape according to any one of claims 3.
5. The zipper tape according to any one of claims 1 to 4, wherein the first content is 10% by mass or more.
6. The second resin composition contains the first modifier at the second content.
   The zipper tape according to any one of claims 1 to 5, wherein the second content is 50% by mass or less.
7. The zipper tape according to any one of claims 1 to 5, wherein the second resin composition does not contain the first modifier.
8. The second resin composition does not contain the first modifier, but contains a second modifier different from the first modifier at a third content lower than the first content. The zipper tape according to any one of claims 1 to 5.
9. The zipper tape according to claim 8, wherein the third content is 50% by mass or less.
10. The second resin composition contains the first modifier at the second content and also contains a second modifier different from the first modifier at the third content.
    The zipper tape according to any one of claims 1 to 5, wherein the total of the second content and the third content is lower than the first content and is 50% by mass or less. ..
11. The second modifier comprises at least one of a polyester elastomer, an ionomer resin, an acid-modified polyolefin, a styrene elastomer, polyethylene, a polyolefin elastomer, and an ethylene-vinyl acetate copolymer (EVA), according to claim 8. The zipper tape according to any one of claim 10.
12. The pair of base strips
    1st base strip and
    It consists of a second base strip facing the first base strip.
    The engaging portion is
    A male engaging portion provided on the first base strip and protruding from the first base strip toward the second base strip,
    A claim comprising a female engaging portion provided on the second base strip, protruding from the second base strip toward the first base strip and engaging with the male engaging portion. The zipper tape according to any one of claims 1 to 11.
13. The zipper tape according to claim 12, wherein the tip angle of the male engaging portion is 60 ° or more and 130 ° or less.
14. The first member having the first base strip, the male engaging portion, and the second resin portion covering the surface of the first base strip opposite to the male engaging portion.
    The second base strip, the female engaging portion, and the second member having the second resin portion covering the surface of the second base strip opposite to the female engaging portion. Prepare,
    The female engaging portion comprises a pair of hook-shaped portions facing each other.
    12. According to claim 12, the minimum thickness of the second member is 0.1 mm or more and 1.0 mm or less in the region sandwiched between the pair of hook-shaped portions in the width direction of the zipper tape. Zipper tape.
15. The first member having the first base strip, the male engaging portion, and the second resin portion covering the surface of the first base strip opposite to the male engaging portion.
    The second base strip, the female engaging portion, and the second member having the second resin portion covering the surface of the second base strip opposite to the female engaging portion. Prepare,
    The zipper tape according to any one of claims 12 to 14, wherein the thickness of the second resin portion is 100 μm or less.
16. The first member having the first base strip, the male engaging portion, and the second resin portion covering the surface of the first base strip opposite to the male engaging portion.
    The second base strip, the female engaging portion, and the second member having the second resin portion covering the surface of the second base strip opposite to the female engaging portion. Prepare,
    The zipper tape according to any one of claims 12 to 15, wherein the mass ratio of the second resin portion to the first resin portion is 0.1% or more and 30% or less.
17. The zipper tape according to any one of claims 1 to 16, wherein the tensile elastic modulus of the first resin portion is 100 MPa or more and 1400 MPa or less.
18. The zipper tape according to any one of claims 1 to 17, and the zipper tape.
    A container with a zipper tape, comprising a container body into which the zipper tape is welded.
19. The container body is formed of a resin composition containing heat-sealing polyethylene terephthalate (PET) as a main component, and has a sealant layer to which the second resin portion is welded.
    The container with a zipper tape according to claim 18, wherein the sealing strength of the second resin portion with respect to the sealant layer is higher than the sealing strength of the first resin portion with respect to the sealant layer.
20. The container with a zipper tape according to claim 19, wherein the sealing strength of the second resin portion with respect to the sealant layer is 10 N / 15 mm or more.
21. The container with a zipper tape according to any one of claims 18 to 20, wherein the container body is a bag body.

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