JP5902483B2 - Hinge cap with membrane hinge - Google Patents

Description

  The present invention relates to a cap capable of pouring the contents of a container without removing it from the container, and in particular, a hinge having a membrane hinge integrally formed from a synthetic resin characterized by a hinge mechanism used for the cap. Regarding the cap.

  Containers are usually used for storing or transporting articles or materials. The contents of the container include various things such as viscous liquid materials such as mayonnaise, ketchup, sauce and jelly, liquid materials having relatively high fluidity such as juice and alcoholic beverages, and granular materials. There are a wide variety of container shapes in overall shape and partial shape, and metal, synthetic resin, rubber, paper, ceramics, glass, etc. are used as the material of the container, and these composites and laminates are also used. used.

  For example, as a synthetic resin container, a direct blow molded container obtained by extruding a synthetic resin cylindrical parison and then blow-molding into a container shape in a molding die, or an injection obtained by injection molding Molded containers and the like are known. The layer structure of the synthetic resin container includes a single layer container or a multilayer container, and the synthetic resin material includes polyolefin such as polyethylene and polypropylene, polyester such as polyethylene terephthalate, polyamide such as nylon, and the like. . As a multilayer synthetic resin container, a multi-layer structure having polyolefin as a surface layer (outer layer and / or inner layer) and a barrier layer such as an ethylene / vinyl alcohol copolymer (EVOH) as an intermediate layer is used. Widely used.

  Examples of the metal container include a container formed by winding a thin metal plate such as aluminum or steel into a substantially cylindrical shape, or a metal thick plate formed by deep drawing in a substantially cup shape. In addition, as the paper container, there is a paper container in which a plate-shaped paper material is wound to have a substantially cylindrical shape or a prism shape.

  Among these containers, containers (hereinafter sometimes referred to as “bottles”) having a neck having a smaller diameter than the trunk (hereinafter also referred to as “mouth neck”) are known, and usually the top part. (It means the upper part when the bottle is set upright.) Has an opening for filling or pouring the contents. A lid or cap (hereinafter sometimes collectively referred to as “cap”) having the same diameter as the neck (mouth neck) of the container is attached to the opening. As a material for the cap, metal, synthetic resin, paper, or the like, or a composite material or a laminated material thereof is used.

  As caps attached to the openings, there are a cap that can be removed from the container to pour out the contents of the container and a cap that can pour out the contents of the container without removing it from the container.

  As shown in FIG. 1, the cap body (1) attached to the mouth-and-neck portion of the container and the overcap covering the top of the cap body (as shown in FIG. 1) can be poured out without removing from the container. 2) and a hinge cap provided with a hinge mechanism (3) for connecting the overcap (2) to the cap body (1) so as to be swingable between a closed state and an open state. ing. In general, the inner peripheral surface of the cap body (1) is provided with a screw portion (1a) for screwing with the outer peripheral surface of the mouth neck portion of the container, and the outer peripheral surface is knurled to prevent slipping ( It is also referred to as “notch processing” (not shown).

  The hinge cap swings the overcap (2) about the swing axis of the hinge mechanism (3) to open the cover, as shown in FIG. A spout (4) for pouring the contents can be formed. Such a hinge cap is widely used as a container cap for liquid seasonings and the like in recent years because it is not necessary to remove the entire cap from the container when the contents of the container are poured out. It can be integrally molded from a synthetic resin.

  As the hinge mechanism (3) of the hinge cap, in addition to a so-called three-point hinge mechanism as described in Patent Document 1, a film-like hinge mechanism described in Patent Documents 2 to 5 is known. The widely used three-point hinge mechanism includes a hinge body that rotatably supports the overcap (2) with respect to the cap body (1), and a pair of elastic pieces disposed on both sides of the hinge body. It is a hinge mechanism.

  The hinge mechanism (3) of the membrane hinge (hereinafter also referred to as “membrane hinge (3)”), as shown in an example in FIGS. 1) and an outer cap of the overcap (2) are connected along the outer cap of the cap, and the cap body (1) and the overcap (2) are connected to each other so as to be swingable. A hinge mechanism comprising a film-like body having a shape having a remarkably large area with respect to the thickness of a sheet or sheet (hereinafter, these shapes are collectively referred to as “film-like”) as a main part of the hinge mechanism. is there. In the illustrated example, the film-like hinge (3) is composed only of the film-like hinge body (3a) and does not include the elastic piece provided in the three-point hinge mechanism. The hinge body (3a) for connecting the cap body (1) and the overcap (2) so as to be able to swing has a thick part (3b), from both sides (3c) of the hinge body (3a). It extends to a region sandwiched between the thick portions (3b). The membrane hinge (3) is configured such that an unstable equilibrium position (dead center position), which will be described later, exists when the overcap (2) is opened and closed, and on both sides of the unstable equilibrium state, the overcap (2 The elasticity necessary for the opening and closing of) can be generated.

  That is, in the membrane hinge (3), when the overcap (2) is swung from the open state to the closed state, the overcap (2) is a predetermined position ("dead point" or "thought point"). The film-like hinge (3) is gradually extended until it reaches (), and in this process, an appropriate resistance is felt to swing the overcap (2). When the overcap (2) exceeds the thought point (dead point), the membrane hinge (3) contracts by its own elastic restoring force and pulls the overcap (2) in the direction of the closed state. When the overcap (2) exceeds the thought point (dead point), the resistance (click feeling), when moving from the thought point to the closed state, or from the thought point (dead point) to the open state The operation characteristic (snap property) at the time of performing is determined by the elastic coefficient, size, elongation amount, etc. of the membrane hinge (3). If the tensile force at the thought point (dead point) has a certain level, it is considered that the snapping property or the click feeling is good. If the tensile force at the thought point (dead point) is too small, the overcap (2) may not be clearly opened and closed, and the overcap (2) may not be reliably closed. On the other hand, if the tensile force at the thought point (dead point) is too large, it may be difficult to open and close the overcap (2), and in some cases, the membrane hinge (3) may be damaged, In some cases, the vicinity of the connecting portion between the outer peripheral surface of the cap body (1) and / or the outer peripheral surface of the overcap (2) of the cylindrical hinge (3) may be damaged.

  In order to improve or adjust the snapping property or click feeling of the membrane hinge (3), the thickness of the membrane hinge (3) is made uneven, or a thick portion is provided on a part of the membrane hinge (3). In addition, a refracting part, a thin part, a slit or a slack is provided on a part of the film-like hinge (3). In many cases, the strength of the connecting portion can be increased by using the connecting portion between the outer peripheral surface of the cap body (1) and / or the outer peripheral surface of the overcap (2) as the thick-walled portion. Has been done. Further, the film-like hinge (3) tends to have non-uniform elongation and stress distribution on the side close to the cap body (1) and / or the overcap (2) and other locations. . Further, the membrane hinge (3) is twisted and locally stress concentrated depending on the connection position of the membrane hinge (3) to the cap body (1) and / or the overcap (2) and the shape of the connection portion. Sometimes. The twist, large stress and stress concentration of the membrane hinge (3) may cause early fatigue breakage of the membrane hinge (3) and may shorten the usage period of the hinge cap.

  In order to suppress twisting of the membrane hinge (3), the entire membrane hinge (3) protrudes outward from the side surfaces of the overcap (2) and the cap body (1), or a large stress is generated. However, the thickness and area of the membrane hinge (3) may be increased so that the durability is maintained. However, when the membrane hinge (3) is protruded, or when the thickness or area of the membrane hinge (3) is increased, the fingertip hits the membrane hinge (3) and the operability of the cap is impaired. There is.

  On the other hand, hinge caps, like many other types of lids and caps, use the contents in the containers in the manufacturing process of containers filled with the contents (hereinafter sometimes referred to as “filled containers”). After filling, it is attached to the mouth and neck of the container. As an apparatus for attaching a cap to a container, for example, an apparatus as shown in FIG. 6 is known (Patent Document 6). In this apparatus, caps (c) sequentially fed from a cap supply unit (hereinafter sometimes referred to as “hopper”) not shown are aligned by cap supply means (d) such as an inclined chute. The caps (c) are transferred to the capper (e) one by one through the cap support device (D) that is a transfer device. The capper (e) grips the cap (c) with the gripper (f), moves to above the filling container (b), and then moves the cap (c) gripped by the gripper (f) to the filling container (b). The cap (c) is fitted or screwed to the mouth and neck while being brought into contact with the mouth and neck. Next, usually, the cap (c) held by the gripper (f) is rotated, so that the cap (c) is screwed into the mouth-neck portion of the filling container (b) and attached to the mouth-neck portion, and the gripper (f ) Is released from the cap (c), and the filled container (b) to which the cap (c) is attached is manufactured. As the cap supply means (d), in addition to the inclined one shown in the figure, one that supplies the cap (c) almost vertically, one that supplies the cap (c) by rotating the sprocket or gear, Various devices are known, such as those that transport c) in parallel and those that transport caps (c) stacked one above the other, and have various diameters, shapes, or lengths, such as chutes. Are known.

  In recent years, in order to improve productivity, the speed of manufacturing apparatuses for filling containers has been increased, and the apparatus for attaching the cap (c) to the containers is also required to increase the operation speed. Accordingly, in the cap supply means (d), the cap (c) is required to be transferred while being aligned quickly and reliably.

  The hinge cap including the cap body (1), the overcap (2), and the hinge mechanism (3) is normally supplied and transferred in the cap supply means (d) in a closed state. Since the hinge cap is provided with a hinge mechanism (3) for slidably connecting the cap body (1) and the overcap (2) in addition to the cap body (1) and the overcap (2), The cap (c) has a protrusion or protrusion. In the cap supply means (d), the cap (c) may come into contact with or get caught by the inner surface of the cap supply means (d). In addition, the hinge mechanisms (3) of the plurality of hinge caps may come into contact with each other or get caught, and it may be difficult to perform quick and reliable alignment and transfer.

  For the hinge cap in which the hinge mechanism (3) is a membrane hinge, the entire membrane hinge (3) protrudes outward from the side surfaces of the overcap (2) and the cap body (1), or the membrane hinge Since the area of (3) may be increased, it may be more difficult to transfer the cap (c) while aligning it quickly and reliably in the cap supply means (d). Therefore, in the case of a hinge cap in which the hinge mechanism (3) is a membrane hinge, in addition to the problem described above that the fingertip hits the hinge mechanism (3) and impairs the operability of the cap, In addition, it is difficult to reliably align and slide, and the posture and position of the cap (c) delivered to the capper (e) is out of a predetermined range. Clogging or the supply of the cap (c) to the capper (e) is delayed, and the production device for the filling container (b) may be stopped. There is also a need for a solution.

  On the other hand, for synthetic resin containers, a lubricant (slip agent) is added to the raw material resin in order to improve the slipperiness of the inner and outer surfaces of the container at the time of use or manufacture of the container ( Patent Document 7). The lubricant is usually added to a raw material resin by a master batch method or kneaded. When the synthetic resin container is a multilayer container, a lubricant is often added to the surface layer (outermost layer or innermost layer). As the lubricant, for example, fatty acid amide is widely used, and specifically, oleic acid amide, stearic acid amide, behenic acid amide (behenic acid amide) and the like are used. These lubricants have been used in a mixture of two or more.

Japanese Patent Laid-Open No. 9-66955 Japanese Examined Patent Publication No. 63-17707 JP 2005-8209 A JP 2006-89068 A Utility Model Registration No. 2524636 JP-A-8-119386 Japanese Patent Laid-Open No. 6-72422

  An object of the present invention is a film-like shape integrally molded from a synthetic resin, which has good snapping properties, durability and operability, and has good transportability in cap supply in the process of attaching a cap to a container. It is in providing a hinge cap provided with a hinge.

  As a result of diligent research on solving the above-mentioned problems, the inventors of the present invention have a hinge cap formed integrally from a synthetic resin. It has been found that the problem can be solved by making the composition of the material specific, and the present invention has been completed.

That is, according to the present invention, the cap body attached to the neck of the container, the overcap covering the top of the cap body, and the overcap with the cap body in a closed state and an open state A hinge cap integrally formed from a synthetic resin and having a hinge mechanism that is slidably connected between the following: a) to c):
a) The hinge mechanism is a hinge mechanism of a membrane hinge in which both end portions are coupled along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively.
b) The membrane hinge is
b-1) The thickness at the end is greater than the thickness at the center of the membrane hinge,
b-2) A position where the thickness of the membrane hinge is minimized exists between the central portion and the end portion, and
c) The hinge mechanism is composed of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond.
A hinge cap comprising a membrane hinge is provided. In the present invention, “molded integrally from synthetic resin” means molded integrally from a resin material containing additives and compounding agents ordinarily used in molding synthetic resins in addition to synthetic resins. Means that.

Moreover, according to this invention, a hinge cap provided with the membrane hinge of the following (1)-(12) is provided as an embodiment.
(1) A hinge cap comprising the membrane hinge, wherein the cap body, the overcap, and the hinge mechanism are made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond.
(2) The fatty acid amide (A) having the unsaturated cis structure carbon double bond is the following (A ₁ ), (A ₂ ) and (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
A hinge cap comprising the above membrane hinge containing at least one fatty acid amide represented by one formula selected from the group consisting of:
(3) The fatty acid amide (A) having an unsaturated cis structure carbon double bond is the fatty acid amide represented by the formula (A ₁ ), and the (A ₂ ) or (A ₃ ) A hinge cap comprising the membrane hinge as described above, which is a mixture with at least one fatty acid amide represented by the formula.
(4) A hinge cap comprising the membrane hinge described above, wherein m in the fatty acid amide represented by the formula (A ₂ ) is m = n + 1 or m = n−1.
(5) A hinge cap comprising the membrane hinge, wherein k in the fatty acid amide represented by the formula (A ₃ ) is k = n.
(6) The fatty acid amide (A) having an unsaturated cis structure carbon double bond is represented by the above formula (A ₁ ) and the following (A ₁₁ ):
(A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10, j ≠ n.);
A hinge cap comprising the membrane hinge as described above, which is a mixture with a fatty acid amide represented by the formula:
(7) The film-form containing the fatty acid amide (A) having an unsaturated cis structure carbon double bond containing a compound having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure. A hinge cap with a hinge.
(8) A hinge cap, wherein the synthetic resin containing the fatty acid amide (A) having an unsaturated cis-structured carbon double bond further includes the membrane hinge containing the saturated fatty acid amide.
(9) A hinge cap provided with the above-mentioned membrane hinge in which the synthetic resin contains polyolefin.
(10) A hinge cap comprising the membrane hinge, wherein the polyolefin is a propylene resin.
(11) A hinge cap comprising the membrane hinge that is heat-fixed in a closed state.
(12) A hinge cap provided with the membrane hinge, wherein the membrane hinge has a thick portion.

According to the present invention, the cap body attached to the mouth and neck of the container, the overcap covering the top of the cap body, and the overcap between the closed state and the open state with respect to the cap body A hinge cap that is integrally formed from a synthetic resin and includes a hinge mechanism that is pivotably connected, and includes the following a) to c):
a) The hinge mechanism is a hinge mechanism of a membrane hinge in which both end portions are coupled along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively.
b) The membrane hinge is
b-1) The thickness at the end is greater than the thickness at the center of the membrane hinge,
b-2) A position where the thickness of the membrane hinge is minimized exists between the central portion and the end portion, and
c) The hinge mechanism is composed of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond.
By being a hinge cap comprising a film-like hinge characterized by that, the snapping property, durability and operability are good, and in the process of attaching the cap to the container, the transportability in the cap supply is good. There is an effect that it is possible to provide a hinge cap that is integrally formed from a synthetic resin and includes a membrane hinge.

It is a partial cross section side view which shows a hinge cap provided with the membrane hinge of this invention in a closed state. It is a partial cross section side view which shows a hinge cap provided with the film-like hinge of this invention in an open state. It is a top view in the open state of a hinge cap provided with the membrane hinge of this invention. FIG. 4 is an enlarged plan view showing an example of a membrane hinge of the hinge cap of FIG. 3. It is sectional drawing which follows an II line | wire of FIG. 4 which shows an example of a film-like hinge. 1 is a schematic diagram of a specific example of a device for attaching a cap to a container.

I. Hinge Cap A hinge cap provided with the membrane hinge of the present invention includes a cap body (1) attached to the mouth and neck of a container, an overcap (2) covering the top of the cap body (1), and the cap body ( A membrane hinge integrally formed from a synthetic resin, comprising a hinge mechanism (3) for slidably connecting the overcap (2) between a closed state and an open state with respect to 1) It is a hinge cap provided. In describing the present invention with reference to the drawings, the same numbers and symbols in the drawings as those used in the description of the prior art are used.

1. Cap body The cap body (1) attached to the mouth and neck of the container is a cup-like member that is directly attached to the mouth and neck of the container by fitting or screwing. As shown in FIGS. 1 and 2, the cap body (1) usually further includes a substantially cylindrical portion surrounding the mouth and neck portion, and a top plate portion that abuts on the tip surface (upper end) of the mouth and neck portion. Also good. An opening is formed at the center of the top plate portion, and this opening forms a spout (4) for pouring the contents of the container. A substantially cylindrical member may protrude from the top plate portion of the cap body (1) so as to surround the spout (4), thereby facilitating pouring the contents of the container. In addition, from the viewpoint of preventing the contents of the container from being spoiled, an oxygen gas barrier single layer or multilayer sheet or film (not shown) is provided on the inner surface of the top plate portion that is in contact with the contents of the container as necessary. May be provided. A screw part (1a) is provided on the inner peripheral surface of the cap body (1) to be screwed with the outer peripheral surface of the mouth neck of the container, and the outer peripheral surface is subjected to knurling (notching) to prevent slipping. Also good.

  The size of the cap body (1) in the hinge cap provided with the membrane hinge of the present invention is not particularly limited. Usually, the substantially cylindrical portion surrounding the mouth-and-neck portion has a diameter (outer diameter and inner diameter) of 10 to 80 mm, high The size of the overcap (2) and the hinge mechanism (3) can be determined according to the size of the cap body (1).

2. Overcap The overcap (2) that covers the top of the cap body (1) covers the top plate of the cap body (1) and closes the spout (4). And is swingably attached to the cap body (1). As shown in FIGS. 1 and 2, the inner surface of the overcap (2) (the surface on the cap body (1) side in the closed state in FIG. 1) is formed on the top plate portion of the cap body (1) when the lid is closed. A cylindrical member that is fitted in the opened opening and prevents the contents of the container from leaking from the spout (4) may be provided. Further, in order to maintain the overcap (2) in the closed state, a locking means (not shown) may be provided. Although the locking means is not limited, for example, a locking ring is provided on the outer peripheral portion of the top plate portion of the cap body (1), and the inner peripheral surface of the overcap (2) is locked using elastic deformation. You may make it become.

3. Hinge mechanism In a hinge cap provided with the membrane hinge of the present invention, a hinge mechanism for connecting the overcap (2) to the cap body (1) so as to be swingable between a closed state and an open state. 3) is a hinge mechanism of a membrane hinge. Both ends of the membrane hinge (3) are connected along the corresponding outer peripheral surface of the cap body and the outer peripheral surface of the overcap.

  As shown schematically in FIGS. 3 and 4, the membrane hinge (3) is connected from the outer peripheral surface of the cap body to the outer peripheral surface of the overcap, to which both ends of the membrane hinge (3) are respectively coupled. It is preferable that the film-like hinge main body (3a) extending over the thickness has the thick part (3b). In the example schematically shown in FIGS. 3 and 4, the thick wall portion (3b) includes the outer peripheral surface of the cap body (1) and the outer periphery of the overcap (2) to which both ends of the membrane hinge (3) are respectively coupled. It is provided along a substantially central portion of the surface (hereinafter sometimes referred to as “the central portion of the coupling portion of the membrane hinge (3)”), but the overcap (2) is closed and opened. It can also be provided in the vicinity of both ends in the swing axis direction between the two. Since the hinge body (3a) has the thick part (3b), the strength of the both ends of the membrane hinge (3) can be secured and the twisting of the both ends can be prevented. The meat part (3b) is not essential. The thickness, area, contour shape, cross-sectional shape, etc. of the hinge body (3a), and the position, thickness, width, length (area), contour shape, cross-sectional shape, etc. of the thick part (3b) should be changed as appropriate. However, the area of the hinge body (3a) is at least 10 times, preferably 12 times or more, more preferably 15 times or more with respect to the area of the thick part (3b). (3a) constitutes the main part of the membrane hinge (3). Therefore, in the present invention, the thickness of the membrane hinge (3) usually means the thickness of the hinge body (3a).

4). Hinge body The hinge body (3a) of the membrane hinge (3) of the hinge cap of the present invention extends from both side portions (3c), and both ends of the membrane hinge (3) are joined to each other. It is a film-like hinge body (3a) extending from the outer peripheral surface of the cap body (1) to the outer peripheral surface of the overcap (2). In FIG. 3, the shape of a sectional view including the axis of the drum used in Japanese music (hereinafter, sometimes referred to as “cross-sectional shape”), which is the simplest contour shape, is used as the hinge body (3 a). Show. Both end portions in the axial direction of the cross-sectional shape of the drum (corresponding to both side portions (3c) of the hinge body (3a)) are substantially linear, and both side surfaces of the cross-sectional shape of the drum are substantially arc-shaped. . Both side surface portions of the cross-sectional shape of the drum are both end portions of the membrane hinge (3), and form arcs along the outer peripheral surface of the cap body (1) and the outer peripheral surface of the overcap (2), respectively. Are connected. However, the shape of the joint portion between the hinge main body (3a) and the outer peripheral surface of the cap main body (1) and / or the outer peripheral surface of the overcap (2) is not required to form an arc, and the cap main body (1 ) Or one or a plurality of linear shapes along the outer peripheral surface of the overcap (2).

  The contour shape of the hinge body (3a) of the membrane hinge (3) is not particularly limited, and various contour shapes can be adopted. For example, both end faces [both side portions (3c)] of the cross-sectional shape of the drum may be concavely curved, or may be convexly curved if desired. Further, in order to improve or adjust the snapping property or click feeling of the membrane hinge (3), or to increase the strength of the connecting portion, the thickness of the hinge body (3a) is made uneven, or the hinge body ( A part of 3a) can be provided with a refracting part, a thin part, a slit or a slack. For example, depending on the position, size, and contour shape of the thin part, the size of the maximum tensile force felt when opening and closing the lid, the position where the maximum tensile force is felt, the time when the tensile force is felt, etc. Snap or click feeling can be adjusted. The same can be said by changing the contour shape, the refracting portion, the slit or the slack of the hinge body (3a).

  Furthermore, the snapping property or the click feeling can also be adjusted by changing the cross-sectional shape of the hinge body (3a) of the membrane hinge (3). FIG. 5 is a cross-sectional view taken along the line II of FIG. 4 showing an example of a membrane hinge. (Note that FIG. 5 is a conceptual diagram for explaining the gist, and dimensions and scales are not actual dimensions.) The hinge main body (3a) has an outer peripheral surface of the cap main body (1) or an overcap (2 ) Is larger than the thickness at the central portion of the hinge body (3a). That is, the thickness of the film hinge (3) at the end is larger than the thickness at the center of the film hinge. Further, the position where the thickness of the hinge main body (3a), that is, the thickness of the membrane hinge (3) is minimized exists between the central portion and the end portion.

  In the thickness of the hinge main body (3a) which is the thickness of the membrane hinge (3), the thickness of the hinge main body (3a) at the end is made larger than the thickness at the central portion, whereby the stress distribution of the hinge main body (3a) is increased. It becomes uniform and the durability of the hinge body (3a) and the membrane hinge (3) is improved. Needless to say, the ratio of the thickness at the end of the hinge body (3a) to the thickness at the center (hereinafter sometimes referred to as “end / center thickness ratio”) is greater than 1, but usually 1. It is appropriate to define the shape of the hinge body (3a) to be in the range of 05 to 5, and the ratio is preferably 1.07 to 4, more preferably 1.1 to 3.5, and still more preferably. It is the range of 1.12-3. If the ratio is too small, the stress applied to the end of the membrane hinge (3) increases, and the durability of the hinge body (3a) and the membrane hinge (3) may be reduced. If the ratio is too large, the central portion of the hinge body (3a) cannot withstand stress, and the durability of the hinge body (3a) and the membrane hinge (3) may be reduced. If the thickness at the end of the membrane hinge (3) is not greater than the thickness at the center of the membrane hinge (3), the snapping property or click feeling will not be pleasant, and the strength of the connecting portion will be insufficient. This may cause early fatigue breakage of the membrane hinge (3) and shorten the usage period of the hinge cap.

  Moreover, since the position where the thickness of the hinge main body (3a), which is the thickness of the membrane hinge (3), is minimum is present between the center and the end of the hinge main body (3a), the overcap (2 ) Has a good snapping or clicking feeling when rocking. That is, by adjusting the position where the thickness of the hinge body (3a) is minimum and / or the ratio of the minimum thickness of the hinge body (3a) to the thickness of the central portion of the hinge body (3a), The tensile force can be adjusted, the snapping property or the click feeling when the overcap (2) is swung can be optimized, and the durability of the hinge cap is improved. Needless to say, the ratio of the minimum thickness of the hinge body (3a) to the thickness of the central portion of the hinge body (3a) (hereinafter sometimes referred to as “minimum portion / central thickness ratio”) is less than 1. It is appropriate to determine the shape of the hinge body (3a) so that it is usually in the range of 0.55 to 0.9, and the ratio is preferably 0.6 to 0.85, more preferably 0. .62 to 0.8, more preferably in the range of 0.65 to 0.75. If the ratio is too small, the change in tensile force when the overcap (2) is swung is not smooth, and a sense of discomfort may be felt. If the ratio is too large, the change in tensile force when the overcap (2) is swung may be monotonous and the snapping property or click feeling may not be good. The ratio of the distance from the center of the hinge body (3a) to the distance between the center and the end of the hinge body (3a) at the position where the thickness of the hinge body (3a) is minimum (hereinafter referred to as “thickness”). It is appropriate to determine the shape of the hinge body (3a) so that it is 0.001 or more and less than 1 and is usually in the range of 0.05 to 0.95. The ratio is preferably in the range of 0.1 to 0.9, more preferably 0.2 to 0.8, and still more preferably 0.3 to 0.7. If the ratio is too small, the position at which the thickness of the hinge body (3a) is minimum is too close to the central portion of the hinge body (3a), so the change in tensile force when the overcap (2) is swung. May be monotonous and have poor snapping or clicking feeling. If the ratio is too large, the position where the thickness of the hinge body (3a) is minimum is too close to the end of the hinge body (3a) where a large stress is generated when the overcap (2) is swung. There exists a possibility that durability of a hinge main body (3a) and a film-like hinge (3) may fall.

5. Thick part As for the membrane hinge (3) in the hinge cap of this invention, it is preferable that the hinge main body (3a) has a thick part (3b). In the present invention, the thick part (3b) means a part having an average thickness of 1.5 times or more with respect to the average thickness of the hinge body (3a), and the cap body (1) and the overcap (2). As long as the hinge mechanism (3) has excellent click feeling, snap feeling and durability, as described above, the position, thickness, and width of the thick part (3b) The length (area), the contour shape, the cross-sectional shape, and the like can be changed as appropriate. That is, as shown in FIG. 3 and FIG. 4, in addition to a substantially rectangular contour shape, a contour shape such as a polygon, an ellipse, or a circle may be used, and the cross-sectional shape may be a plateau with a flat top surface. The shape may be a truncated pyramid, or the top surface may be uneven. Further, the position of the thick portion (3b) is not limited to the central portion of the coupling portion of the illustrated membrane hinge (3), the adjacent portion of the central portion of the coupling portion of the membrane hinge (3), and the membrane shape. The hinge (3) can be positioned in the vicinity of both end portions in the swing axis direction between the closed state and the open state of the overcap (2), an intermediate position thereof, or the like.

II. Hinge cap integrally molded from synthetic resin A hinge cap comprising the membrane hinge of the present invention comprises a cap body (1), an overcap (2), and a hinge mechanism (3), and is integrally molded from a synthetic resin. Hinge cap. As described above, “synthetic resin” means a resin material containing an additive, a compounding agent and the like in addition to the synthetic resin.

  The composition of the resin material forming the cap body (1), the overcap (2), and the hinge mechanism (3) may be the same or different, but is the same from the viewpoints of moldability and handleability. Preferably, the composition is In addition, the composition of the resin material may be the same or uniform for each of the cap body (1), the overcap (2), and / or the hinge mechanism (3), and each of them may be non-uniform. It may be of a simple composition. A so-called gradient material in which the composition of the resin continuously changes may be used. For example, the composition of the hinge body (3a) and the thick part (3b) of the hinge mechanism (3) may be the same or different. The cap body (1), the overcap (2), or the hinge mechanism (3) may be a single layer or a laminated layer. For example, an oxygen gas barrier sheet or film, a reinforcing sheet, a film, or the like is laminated. It may be a thing.

1. Synthetic Resin A hinge cap including the membrane hinge of the present invention is a hinge cap integrally formed from a synthetic resin, including a cap body (1), an overcap (2), and a hinge mechanism (3). As the synthetic resin, a synthetic resin conventionally used in a synthetic resin cap, particularly a hinge cap or a synthetic resin molded container, can be employed. Specifically, synthetic resins containing, as main resin components, polyolefins such as ethylene resins and propylene resins; polyesters such as polyethylene terephthalate, polyglycolic acid and polylactic acid; polyamides such as nylon 66 and nylon 612; Can be adopted. Preferably, the synthetic resin contains polyolefin as a main resin component.

  In addition to the main resin component described above, the hinge cap provided with the membrane hinge of the present invention, as long as it does not impair the object of the present invention, an ethylene / vinyl acetate copolymer, an ethylene / acrylic acid copolymer, if desired, Other resin components such as ethylene / methyl acrylate copolymer and maleic anhydride-modified polyolefin can be contained as a modifier or moldability improver. The content of these other resin components is usually 20% by mass or less, preferably 10% by mass or less, more preferably 5% by mass or less in the resin component in the resin material.

[Polyolefin]
As a synthetic resin for forming a hinge cap having the membrane hinge of the present invention, a polyolefin preferably used may be referred to as an olefin monomer such as ethylene, propylene, butene, or pentene (hereinafter simply referred to as “olefin”). ) Homopolymer or copolymer. Preferably, it is an ethylene-based resin or a propylene-based resin, and when importance is attached to repeated fatigue resistance, a propylene-based resin can be used.

[Ethylene resin]
The ethylene-based resin is an ethylene homopolymer or an ethylene copolymer containing ethylene as a main component, and the copolymer is a copolymer of ethylene with another olefin and / or another unsaturated monomer. It is a polymer. Preferred ethylene resins include low density polyethylene, high density polyethylene, metallocene catalyzed ethylene polyolefin, and the like.

The low density polyethylene is generally a polyethylene having a density of 0.910 to 0.930 g / cm ³ , preferably 0.912 to 0.928 g / cm ³ . In addition, the density of polyethylene is measured based on JIS K6922-2. As the low density polyethylene, one having an MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. In addition, those having a polydispersity (Mw / Mn), which is an index of molecular weight distribution, in the range of usually from 1.2 to 6, preferably from 1.5 to 4 are effective in improving moldability. In addition, MFR of polyethylene is measured based on JIS K6922-2, and polydispersity (Mw / Mn) which is an index of molecular weight distribution is measured based on JIS K7252.

  As low-density polyethylene, in addition to so-called Ziegler-Natta catalyst, high-pressure polyethylene (soft polyethylene), copolymers of ethylene and other olefins such as linear low-density polyethylene (LLDPE) are also used. can do. A synthetic product can be used as the low density polyethylene, but a commercially available product may be used. Commercially available products include Novatec LD (registered trademark) manufactured by Nippon Polyethylene Co., Ltd., and low density polyethylene manufactured by Mitsui DuPont Polychemical Co., Ltd.

High density polyethylene is generally polyethylene having a density of 0.942 g / cm ³ or more. Usually, it is polyethylene with a density of 0.980 g / cm ³ or less, preferably 0.945 to 0.970 g / cm ³ , more preferably 0.948 to 0.965 g / cm ³ . As the high density polyethylene, one having an MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. The high-density polyethylene can be a synthetic product, but can also be selected from commercially available products. A commercially available product is a low-pressure high-density polyethylene obtained using a so-called Ziegler-Natta catalyst (hereinafter sometimes referred to as “Ziegler catalyst”), which is well known as a catalyst for stereoregular polymerization of α-olefins. There are Novatec HD (registered trademark) manufactured by Nippon Polyethylene Co., Ltd. and Hi-Zex (registered trademark) manufactured by Prime Polymer Co., Ltd.

  Metallocene-catalyzed ethylene-based polyolefin means an ethylene-based resin obtained by using a metallocene catalyst. Ethylene or a mixed monomer containing ethylene as a main component and α-olefin as a subcomponent is present in the presence of a metallocene catalyst. It is an ethylene-based resin obtained by polymerizing below. Therefore, the metallocene-catalyzed ethylene-based polyolefin contains polyethylene or an ethylene / α-olefin copolymer obtained by performing a polymerization reaction in the presence of a metallocene catalyst. As the α-olefin, those having 3 to 10 carbon atoms are preferable, and propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, heptene-1, octene-1, and the like are preferable. Can be mentioned. These α-olefins are preferably present in the copolymer in an amount of 3 to 15 mol%.

Metallocene-catalyzed ethylene-based polyolefins are characterized by a narrow molecular weight distribution, and in the present invention, those having a polydispersity (Mw / Mn) of usually 1.2 to 6, preferably 1.5 to 4 are used. Is done. For the purpose of improving moldability, those having relatively long chain branches introduced during polymerization or in subsequent steps are also preferably used. The metallocene-catalyzed ethylene-based polyolefin usually has a density of about 0.890 to 0.920 g / cm ³ , preferably about 0.892 to 0.918 g / cm ³ , and MFR (temperature 190 ° C., load 21.18 N). ) Is usually 1 to 100 g / 10 min, preferably about 10 to 50 g / 10 min. As the metallocene-catalyzed ethylene-based polyolefin, a synthetic product can be used, but it can also be selected from commercially available products. Examples of commercially available products include Exelen (registered trademark) manufactured by Sumitomo Chemical Co., Ltd. and Harmolex (registered trademark) manufactured by Nippon Polyethylene Co., Ltd.

[Propylene resin]
In the present invention, the propylene-based resin particularly preferably used is a propylene homopolymer or a propylene copolymer containing propylene as a main component, and the copolymer includes propylene and other olefins such as ethylene. (Α-olefin) and / or copolymers with other unsaturated monomers. Preferred propylene-based resins include Ziegler-catalyzed propylene homopolymers or Ziegler-catalyzed propylene random copolymers, metallocene-catalyzed propylene homopolymers or metallocene-catalyzed propylene random copolymers, metallocene-catalyzed propylene-based block copolymers, and the like.

  The Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer is a propylene homopolymer or propylene random copolymer obtained using a Ziegler-Natta catalyst. The Ziegler-catalyzed propylene random copolymer has a propylene monomer unit content in the copolymer of 100 to 94% by mass (excluding 100% by mass), preferably 99.7 to 95% by mass, more preferably 99.5 to 95.5% by mass, and the content of α-olefin monomer units is 0 to 6% by mass (excluding 0% by mass), preferably 0.3 to 5% by mass, more preferably 0. A random copolymer having a ratio of 0.5 to 4.5% by mass. Examples of the α-olefin copolymerized with propylene include ethylene and / or an α-olefin having 4 to 20 carbon atoms, specifically, ethylene, butene-1, pentene-1, hexene-1, octene. -1,4-methylpentene-1 and the like. Two or more of the α-olefins can be used in combination.

The Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer has a density in the range of usually 0.880 to 0.930 g / cm ³ , preferably 0.885 to 0.925 g / cm ³ , An MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. The polydispersity (Mw / Mn) is usually in the range of 1.2 to 6, preferably 1.5 to 4, and is effective in terms of improving moldability. As the Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer, a synthetic product can be used, but a commercially available product may be used. Examples of commercially available products include Novatec PP (registered trademark) manufactured by Nippon Polypro Co., Ltd., Sumitomo Nobren (registered trademark) manufactured by Sumitomo Chemical Co., Ltd., Sun Allomer (registered trademark) manufactured by Sun Allomer Co., Ltd., and Prime Polymer Co., Ltd. Prime Polypro (registered trademark).

  The metallocene-catalyzed propylene homopolymer or metallocene-catalyzed propylene random copolymer is a propylene homopolymer or propylene random copolymer obtained using a metallocene catalyst. In the metallocene-catalyzed propylene random copolymer, the content of propylene monomer units in the copolymer is 100 to 94% by mass (excluding 100% by mass), preferably 99.7 to 95% by mass, more preferably. 99.5 to 95.5% by mass, and the content of α-olefin monomer units is 0 to 6% by mass (excluding 0% by mass), preferably 0.3 to 5% by mass, more preferably 0. A random copolymer having a ratio of 0.5 to 4.5% by mass. Examples of the α-olefin copolymerized with propylene include ethylene and / or an α-olefin having 4 to 20 carbon atoms, specifically, ethylene, butene-1, pentene-1, hexene-1, octene. -1,4-methylpentene-1 and the like. Two or more of the α-olefins can be used in combination.

The metallocene-catalyzed propylene homopolymer or metallocene-catalyzed propylene random copolymer usually has a density of about 0.880 to 0.930 g / cm ³ , preferably about 0.885 to 0.925 g / cm ³ , and MFR (Measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. As the metallocene-catalyzed propylene homopolymer or the metallocene-catalyzed propylene random copolymer, a synthetic product can be used, but it can also be selected from commercially available products. Examples of commercially available products include Wintec (registered trademark) manufactured by Nippon Polypro Co., Ltd.

  The metallocene-catalyzed propylene-based block copolymer is a block copolymer obtained by using a metallocene catalyst and comprising a polymer block made of polypropylene and a polymer block made of ethylene / propylene copolymer. . Specifically, a polymer block made of polypropylene (hereinafter sometimes referred to as “PP block”) and a polymer block made of propylene / ethylene copolymer (hereinafter sometimes referred to as “EP block”). Are block copolymers obtained by using a metallocene catalyst, each of which is bonded to one or more blocks, and the cyclic fatigue resistance is improved by propylene / ethylene copolymer while maintaining the rigidity of polypropylene. It is a block copolymer known per se that exhibits a high balance of rigidity and impact resistance.

The metallocene-catalyzed propylene-based block copolymer usually has a density of about 0.880 to 0.930 g / cm ³ , preferably about 0.885 to 0.925 g / cm ³ , and MFR (temperature 190 ° C., load 21. 18N) is usually 1 to 100 g / 10 min, preferably about 10 to 50 g / 10 min. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. A synthetic product can be used as the metallocene-catalyzed propylene-based block copolymer, but it can also be selected from commercially available products. Examples of commercially available products include Novatec PP (registered trademark) manufactured by Nippon Polypro Co., Ltd., Sumitomo Nobren (registered trademark) manufactured by Sumitomo Chemical Co., Ltd., Sun Allomer (registered trademark) manufactured by Sun Allomer Co., Ltd., and Prime Polymer Co., Ltd. Examples include Prime Polypro (registered trademark) and Kernel (registered trademark) manufactured by Nippon Polyethylene Corporation.

  The hinge cap integrally molded from synthetic resin is a synthetic resin obtained by using a Ziegler catalyst or a metallocene catalyst. The energy dispersive X-ray detection is performed on the resin pellet specimen scraped from the hinge cap. Qualitative analysis is performed using a scanning electron microscope equipped with a detector to detect a trace amount of elemental species of the catalyst remaining in the specimen, and the group IVa Ti, which is a transition metal in the fourth period of the periodic table, Appearance peak corresponding to the energy of the group Va which is the transition metal of the periodicity or the energy of the Cr of the group VIa which is the transition metal of the fourth period is confirmed (Ziegler catalyst), or the transition metal of the fifth period of the periodic table This is confirmed by confirming the presence of a peak corresponding to the energy of Zr of Group IVa or Hf of Group IVa which is a transition metal of the sixth period (metallocene catalyst). It is possible.

2. Fatty acid amide having unsaturated cis structure carbon double bond In the hinge cap provided with the membrane hinge of the present invention, the hinge mechanism (3) converts fatty acid amide (A) having unsaturated cis structure carbon double bond to 100 to 4500 ppm. It consists of a synthetic resin. That is, at least the hinge mechanism (3) of the hinge cap provided with the membrane hinge of the present invention is obtained by adding a fatty acid amide (A) having an unsaturated cis structure carbon double bond to the hinge mechanism ( It contains 100-4500 ppm with respect to the total mass of the synthetic resin which forms 3). It is preferable that the cap body (1), the overcap (2) and the hinge mechanism (3) are made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. . The fatty acid amide (A) having an unsaturated cis-structured carbon double bond (hereinafter sometimes referred to as “unsaturated fatty acid amide of (A)”) means at least one bond of carbon diamide in the molecular structure of the fatty acid amide. An unsaturated fatty amide having a heavy bond, wherein all of the carbon double bonds are unsaturated cis-structured carbon double bonds.

  The hinge cap provided with the membrane hinge of the present invention has a snap property when at least the hinge mechanism (3) is made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. A hinge cap integrally formed from a synthetic resin, which has good durability and operability, and has good transportability in cap supply in the step of attaching the cap to the container, can be provided. The content of the unsaturated fatty acid amide (A) is preferably 110 to 4400 ppm, more preferably 115 to 4300 ppm, still more preferably 120 to 4200 ppm, and particularly preferably 125 to 4100 ppm. In addition, when the unsaturated fatty acid amide (A) is a mixture of fatty acid amides having two or more types of unsaturated cis structure carbon double bonds as described later, the total content of fatty acid amides is within the above range. Need to be included.

  When the content of the unsaturated fatty acid amide in (A) is in the above range, in the step of attaching the cap to the container, the transportability in supplying the cap can be improved. When the content of the unsaturated fatty acid amide in (A) is out of the above range, in the step of attaching the cap to the container, the hinge cap provided with the membrane hinge is clogged in the cap supply means, or the membrane shape to the capper If the supply of the hinge cap provided with the hinge is delayed, there is a possibility that troubles such as stopping of the filling container manufacturing apparatus may occur.

  Fatty acid amides, particularly fatty acid amides having unsaturated bonds are known to function as lubricants for synthetic resins, but if unsaturated fatty acid amides have carbon double bonds with a trans structure, resin materials The unsaturated fatty acid amide having the trans structure is insufficient in the uniform blending of the hinge structure (3) and, in some cases, the outer surface of the hinge cap including the cap body (1) and the overcap (2) In some cases, the resin may come off or precipitate due to local foaming. As a result, the surface gloss and touch of the outer surface of the hinge cap such as the hinge mechanism (3) deteriorate, the hinge mechanism (3), etc. The slipperiness of the hinge cap may deteriorate, and in the process of attaching the cap to the container, the transportability in supplying the cap may not be good.

  The unsaturated fatty acid amide of (A) is preferably an unsaturated fatty acid amide having one bond of a carbon double bond having an unsaturated cis structure in the molecular structure. In addition, the unsaturated fatty acid amide of (A) may be an unsaturated fatty acid amide having a plurality of unsaturated cis-structured carbon double bonds in the molecular structure, and an unsaturated cis-structured carbon double bond in the molecular structure. , Preferably 6 bonds or less, more preferably 5 bonds or less, and still more preferably 4 bonds or less. Therefore, the unsaturated fatty acid amide (A) may contain a compound having an unsaturated cis structure carbon double bond having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure. .

[Unsaturated fatty acid amide having one carbon double bond of unsaturated cis structure in the molecular structure]
Examples of the unsaturated fatty acid amide (A) having one bond of a carbon double bond having an unsaturated cis structure include the following formulas (A ₁ ) to (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
And at least one fatty acid amide compound represented by one formula selected from the group consisting of: (Hereinafter, (the fatty acid amide of the formula of _{A 1),} there may be referred to as "Formula _{(A 1} fatty acid amides)", further may be simply referred to as "Formula _{(A 1)". (A} 2) The same applies to the fatty acid amide represented by the formula (A ₃ ).)

Examples of the unsaturated fatty acid amide (A) having a preferred unsaturated cis-structured carbon double bond include compounds represented by the following formulas (A ₁ ) to (A ₃ ).

Formula (A ₁ ): H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10)
cis-8,9-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ] (corresponding to n = 6)
cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to n = 7)
cis-10, 11-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₈ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (corresponding to n = 8)
cis-11,12-ethaeicosenoamide [H ₂ N—CO — (— CH ₂ —) ₉ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to n = 9)
cis-12, 13- tetraeicosenoamide (corresponding to n = 10) _{[H 2 N-CO - (-} CH 2 -) 10 -CH = CH - (- - CH 2) 10 -CH 3 ]

Formula (A ₂ ): H ₂ N—CO — (— CH ₂ —) _{m− 2} —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is in the range of 6 ≦ m ≦ 10) integer)
cis-6,7-tetradecenoamide _{[H 2 N-CO - (-} CH 2 -) 4 -CH = CH - (- CH 2 -) 6 -CH 3 ] (corresponding to m = 6)
cis-7,8-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₅ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to m = 7)
cis-8,9-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (corresponding to m = 8)
cis-9,10-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to m = 9)
cis-10, 11- ethaeicosenoamide (corresponding to m = 10) _{[H 2 N-CO - (-} CH 2 -) 8 -CH = CH - (- - CH 2) 10 -CH 3 ]

Formula (A ₃ ): H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10)
cis-12,13-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₀ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ] (corresponding to k = 6)
cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to k = 7)
cis-14,15- tetracosenoamide (corresponding to k = 8) _{[H 2 N-CO - (-} CH 2 -) 12 -CH = CH - 8 -CH 3 (- - CH 2) ]
cis-15,16-hexacosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₃ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to k = 9)
cis-16,17- octacosenoamide (corresponding to k = 10) _{[H 2 N-CO - (-} CH 2 -) 14 -CH = CH - (- - CH 2) 10 -CH 3 ]

[Unsaturated fatty acid amide having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure]
The unsaturated fatty acid amide of (A), which is a compound having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure, includes, for example, an unsaturated cis structure carbon double bond in the molecular structure. The following compounds having 4 bonds are exemplified.

cis-5,6-8,9-11,12-14,15-arachidonic acid amide [H ₂ N—CO — (— CH ₂ —) ₃ —CH═CH—CH ₂ —CH═CH—CH ₂ — _{CH = CH-CH 2 -CH =} CH - (- CH 2 -) 4 -CH 3 ]

  The unsaturated fatty acid amide of (A), which is a compound having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure, can be used alone or with other unsaturated fatty acid amides of (A) It can also be used as a mixture.

[Mixture of (A) unsaturated fatty acid amide]
As the unsaturated fatty acid amide of (A), a fatty acid amide of the above formulas (A ₁ ) to (A ₃ ), or a carbon double bond of an unsaturated cis structure of 2 to 4 bonds in the molecular structure. The use of one type of unsaturated fatty acid amide selected from fatty acid amides can provide the desired effect, but even if a mixture of two or more types of unsaturated fatty acid amides (A) is used. Good. The mixture of unsaturated fatty acid amides (A) preferably contains the fatty acid amide of the above formula (A ₁ ).

Accordingly, a preferred mixture of unsaturated fatty acid amides of (A) includes the fatty acid amide of the above formula (A ₁ ) and at least one fatty acid amide represented by the above formula of (A ₂ ) or (A ₃ ) And a mixture. The proportion of the fatty acid amide of the formula (A ₁ ) in the mixture is 0.05 to 99.95% by mass, preferably 0.1 to 99.9% by mass, more preferably 0.15 to 99.85% by mass. It is. Therefore, the ratio of the fatty acid amide of the formula (A ₂ ) or the fatty acid amide of the formula (A ₃ ) is 99.95 to 0.05% by mass, preferably 99.9 to 0.1% by mass, Preferably it is 99.85-0.15 mass%.

In particular, the mixture of unsaturated fatty acid amides of (A) is a fatty acid amide of formula (A ₁ ), ie H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ — ) _N —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) and the fatty acid amide of the above formula (A ₂ ), that is, H ₂ N—CO — (— CH ₂ —) _{m— 2} -CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10), and m = n + 1 or m = n−1 And a mixture thereof.

Specifically, the formula (A ₁ ) is cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] ( n = 7), and
Formula _{(A 2)} is, cis-6,7-tetradecenoamide _{[H 2 N-CO - (-} CH 2 -) 4 -CH = CH - (- CH 2 -) 6 -CH 3 ] (m = 6 = n -1) or cis-8,9-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (m = 8 = (equivalent to n + 1) can be preferably used, and cis-10, 11-ethaeicosenoamide [H ₂ N—CO — (— CH ₂ —) ₈ —CH═CH — (— CH ₂ —) ₁₀ Mixtures of combinations with —CH ₃ ] (m = 10) can also be used.

In addition, the mixture of unsaturated fatty acid amides of (A) is a fatty acid amide of the above formula (A ₁ ), that is, H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ — ) _N- CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) and the fatty acid amide of the above formula (A ₃ ), that is, H ₂ N—CO — (— CH ₂ —) _{k + 4} − CH = CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10), and is preferably a mixture with the fatty acid amide in which k = n. .

Specifically, the formula (A ₁ ) is cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] ( n = 7), and the formula (A ₃ ) is cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ —CH═CH — (— CH ₂ —) ₇ — CH ₃ ] (corresponding to k = 7 = n) is preferably used.

Furthermore, as the mixture of unsaturated fatty acid amides of (A), a mixture of two or more compounds belonging to the fatty acid amides of formula (A ₁ ) and having different values of n can be used. That is, (A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) And (A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10) , J ≠ n)).

Specifically, for example, as formula (A ₁ ), cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (Corresponding to n = 7) and formula (A ₁₁ ), cis-8,9-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ A mixture with —CH ₃ ] (corresponding to j = 6) can be preferably used.

Furthermore, the unsaturated fatty acid amide of (A) which is a compound having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure is mixed with other unsaturated fatty acid amides of (A). It can also be used. As the other unsaturated fatty acid amides (A), the fatty acid amides of the above formulas (A ₁ ) to (A ₃ ) are preferably used, and the fatty acid amides of the formula (A ₁ ) are particularly preferable. Specifically, cis-5,6-8,9-11,12-14,15-arachidonic acid amide [H ₂ N—CO — (— CH ₂ —) ₃ —CH═CH—CH ₂ —CH═ _{CH-CH 2 -CH = CH-} CH 2 -CH = CH - (- CH 2 -) and 4 -CH _3], a mixture of cis-9,10-octadecenoamide represented by the formula _{(a 1)} and It can be preferably used.

[Method for producing unsaturated fatty acid amide (A)]
As the unsaturated fatty acid amide of (A) contained in at least the hinge mechanism (3) of the hinge cap provided with the membrane hinge of the present invention, a commercially available product may be used, or the commercially available product may be a mixture or an impurity. May be obtained by separating the desired unsaturated fatty acid amide by an operation such as extraction. Also, for example, the fatty acid amide of the above formula (A ₂ ), that is, (A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) can be produced by the following method, and may be obtained as a synthetic product.

The following (formula a) having a CH ₃ O—CO— terminal group and a hydroxyl group terminal or a carboxylic acid terminal at the α, ω positions and a (m−1) -linked methylene group (—CH ₂ —) _m−1 ) As a starting material. ((Formula a) illustrates a compound having a hydroxyl terminal.)
(Formula _{a) CH 3 O-CO -} (- CH 2 -) m-1 -OH

The hydroxyl group terminal of the compound represented by formula (a) is bromine-substituted using carbon tetrabromide (CBr ₄ ), and then methyl cyanide (CH ₃ ) using triphenylphosphine (PPh ₃ , triphenylphosphine). CN) Bromine is reacted with PPh ₃ in a solvent to obtain an ionic intermediate of formula (b).
(Formula b) [CH ₃ O—CO — (— CH ₂ —) _m−1 -PPh ₃ ] ⁺ + Br ⁻

The ionic intermediate (formula b) is reacted with decyl aldehyde, and the PPh ₃ group is terminated with an alkyl group having an unsaturated cis-structured carbon double bond. , ω structure compound.
(Formula _{c) CH 3 O-CO -} (- CH 2 -) m-2 -CH = CH - (- CH 2 -) m -CH 3

Next, lithium hydroxide is reacted with the CH ₃ O—CO— terminal group of the α, ω structure compound of the formula (c) to form a hydroxyl terminal, which is saturated with ammonium in a solvent of oxalyl chrolide and methylene chloride. The fatty acid amide having an unsaturated cis structure carbon double bond represented by the following (formula d), that is, a fatty acid amide of (A ₂ ) is synthesized.
(Wherein _{d) H 2 N-CO -} (- CH 2 -) m-2 -CH = CH - (- CH 2 -) m -CH 3
By changing m (where m is an integer in the range of 6 ≦ m ≦ 10), a fatty acid amide having an unsaturated cis structure carbon double bond having a desired carbon number is obtained using this synthetic route. Can do.

In the synthesis of fatty acid amide having an unsaturated carbon double bond, as is well known, a compound having an unsaturated cis structure carbon double bond and a compound having an unsaturated trans structure carbon double bond are simultaneously prepared. As a result, chromatographic development is performed using a mixed solvent having a concentration gradient of 100% by mass (initial development) to 40% by mass of ethyl acetate and hexane, and isomerism of unsaturated cis structure and unsaturated trans structure is achieved. Separate the body. At that time, using a proton ¹ H-NMR nuclear magnetic resonance apparatus, identification according to the chemical shift value is performed based on a standard substance made by Aldorich for the fraction solution at each chromatography development time. Identify the fluid. The fraction solution is dried under reduced pressure to recover the desired fatty acid amide having an unsaturated cis structure carbon double bond.

3. Other compounding agents At least the hinge mechanism (3) in the cap body (1), the overcap (2), and the hinge mechanism (3) of the hinge cap including the membrane hinge integrally formed from the synthetic resin of the present invention. ), It is essential that the unsaturated fatty acid amide of (A) is contained in an amount of 100 to 4500 ppm, and, if necessary, as other compounding agents, reinforcing materials, fillers, antioxidants, photodegradation prevention An additive such as an agent, an antistatic agent, an ultraviolet absorber, or a nucleating agent can be blended. As the reinforcing material or filler, talc, calcium carbonate, titanium oxide, carbon black, mica and the like can be used. What is necessary is just to select the quantity of the optimal range according to the objective of an additive in the range of 0.01-100 mass parts normally with respect to 100 mass parts of synthetic resins. For example, the reinforcing material or filler can be blended in an amount of usually 10 to 100 parts by mass, preferably 15 to 80 parts by mass, and more preferably 20 to 60 parts by mass. Depending on the type of the additive, it may be usually 0.01 to 10 parts by mass, preferably 0.05 to 5 parts by mass, more preferably 0.1 to 2 parts by mass.

  In particular, as other compounding agents, other compounds known as lubricants can be used. The lubricant is preferably a saturated fatty acid amide, and at least the hinge mechanism (3) in the hinge cap provided with the membrane-like hinge of the present invention contains a predetermined amount of the unsaturated fatty acid amide (A) and the saturated fatty acid. By containing an amide, effects such as further improvement of transportability in cap supply can be achieved. As the saturated fatty acid amide, a compound usually used as a lubricant can be used, for example, butyramide, valeric acid amide, caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, Examples include palmitic acid amide, stearic acid amide, arachidic acid amide, and behenic acid amide, and stearic acid amide and behenic acid amide are preferable. The content in the case of containing a saturated fatty acid amide is preferably 10% by mass or less, more preferably 8% by mass or less, and still more preferably, with respect to the total amount of the unsaturated fatty acid amide (A) and the saturated fatty acid amide. The lower limit of the content is about 0.5% by mass, and if it is 1% by mass, a sufficient effect can be realized.

III. Evaluation of hinge cap provided with membrane hinge The hinge cap provided with the membrane hinge of the present invention has good snapping property, durability and operability, and has a transferability in cap supply in the step of attaching the cap to the container. It is a hinge cap with a membrane-like hinge that is molded from a synthetic resin and is good.

[Evaluation of transportability in cap supply (chute clogging evaluation)]
It can be evaluated by the following method that the hinge cap provided with the membrane hinge has good transportability of cap supply in the step of attaching the cap to the container, for example, as schematically shown in FIG. . That is, 10,000 hinge caps (c) that have been previously closed are put into a hopper (not shown), and the square shape of a square of 40 mm in length and 40 mm in width and 500 mm in length is formed from the hopper. The hinge cap (c) in the closed state is continuously put into the conduit (chute) at a supply rate of 2 pieces / second and transferred to the capper device using the delivery device (D). In this series of transfer steps, the number of times (out of 10,000) that the chute is clogged with the chute is counted. The measurement is performed three times, and the average value is used as the number of times of shoot clogging, and shoot clogging is evaluated according to the following criteria. If the chute clogging evaluation is “◯”, it can be said that the cap supply transportability is good in the process of attaching the cap to the container.
<Shoot clogging evaluation>
Choke clogging evaluation ○: Shoot clogging times 0-2 times Chute clogging evaluation ×: Shoot clogging times 3 times or more

[Evaluation of snap properties]
The snapping property of a hinge cap provided with a membrane hinge can be determined by the following evaluation by clicking feeling evaluation. That is, a test in which the hinge mechanism (3) of the integrally formed hinge cap is swung from the closed state to the open state and then swung from the open state to the closed state is repeated 50 times. A test subject (age 18-60) performs a sensibility evaluation as to whether or not a pleasant click feeling is felt. A majority of subjects determine that the click feeling is good for the hinge cap provided with the membrane hinge evaluated that the pleasant click feeling is sustained.

IV. Manufacturing method of hinge cap integrally formed from synthetic resin Although the manufacturing method of a hinge cap provided with the membrane hinge of the present invention is not particularly limited, for example, a synthetic resin and a fatty acid amide having an unsaturated cis structure carbon double bond (A) A cavity-shaped mold corresponding to a hinge cap including a cap body (1), an overcap (2), and a hinge mechanism (3), if necessary, by using a resin material containing other materials. Can be produced by injection molding, compression molding, cast molding, vacuum molding, pressure molding, powder molding and other resin molding methods.

  The hinge cap provided with the membrane hinge of the present invention includes a so-called hinge mechanism of the membrane hinge, that is, the membrane hinge (3), and the membrane hinge (3) has a thickness at the end thereof. A position where the thickness of the membrane hinge (3) is minimum and the thickness of the membrane hinge (3) is minimum exists between the center portion and the end of the membrane hinge (3). The membranous hinge (3) which is a mechanism is characterized by comprising a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. Therefore, in manufacturing a hinge cap including the membrane hinge of the present invention, a cavity-shaped mold corresponding to the membrane hinge (3) is used, and a fatty acid having an unsaturated cis structure carbon double bond. It is required to reliably supply a synthetic resin containing 100 to 4500 ppm of amide (A) to a cavity-shaped mold corresponding to the membrane hinge (3).

  In order to manufacture a hinge cap provided with the membrane hinge of the present invention from the viewpoint of shape accuracy, ease of molding, etc., the cap body (1), overcap (2 ) And a cavity-shaped mold corresponding to the hinge cap provided with the hinge mechanism (3), and the cap body (1), the overcap (2), and the hinge mechanism (3) are integrally formed. It is preferable. In particular, it is preferable to integrally mold a hinge cap having a membrane hinge by injection molding.

  Further, after the hinge cap integrally molded from the synthetic resin is taken out of the mold by the molding method described above, the hinge mechanism (3) is usually swung to close the hinge cap provided with the membrane hinge. When the cap is closed and heat-fixed in the closed state, the shape and dimensions of the hinge cap provided with the membrane hinge are adjusted and stable. The property is further improved. In the heat setting, heat treatment is performed at a temperature of 30 to 80 ° C., preferably 35 to 75 ° C., more preferably 40 to 70 ° C. by a method known per se such as storage in a constant temperature room or hot air blowing. The time for performing the heat setting can be appropriately selected according to the temperature of the heat treatment and other conditions, but is usually 0.5 hours to 3 months, preferably 5 hours to 1 month, more preferably 1 day to 2 weeks. do it.

  EXAMPLES The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to the examples. The measuring method of the characteristic or physical property of a hinge cap provided with the resin raw material and film-like hinge in an Example and a comparative example is as follows.

[Density, MFR and polydispersity]
The density and MFR (temperature 190 ° C., load 21.18 N) of the synthetic resin were measured according to JIS K6922-2. The polydispersity (Mw / Mn) was measured according to JIS K7252.

[Shoot clogging evaluation]
It was evaluated by the following method that the hinge cap provided with the membrane hinge had good cap supply transportability in the step of attaching the cap to the container. That is, a hinge cap (c) having 10,000 membrane-like hinges that have been previously closed is put into the hopper, and has a square cross section of 40 mm in length and 40 mm in width and 500 mm in length. A hinge cap (c) having a closed membrane hinge is put into a columnar conduit (chute) continuously at a supply speed of 2 pieces / second, and transferred to a capper device using a delivery device (D). . In this series of transfer steps, the number of times of chute clogging in the chute (out of 10,000) was counted. Measurement was performed three times, and the average value was taken as the number of times of shoot clogging, and shoot clogging was evaluated according to the following criteria.
<Shoot clogging evaluation>
Choke clogging evaluation ○: Shoot clogging times 0-2 times Chute clogging evaluation ×: Shoot clogging times 3 times or more

[Click feeling evaluation]
The test of repeating the operation of swinging the hinge mechanism (3) of the integrally formed hinge cap from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. The subjects (aged 18 to 60 years old) performed a sensibility evaluation as to whether or not a pleasant click feeling can be felt, and the majority of the subjects evaluated the click on the hinge cap provided with the membrane hinge evaluated that the pleasant click feeling persisted. Was determined to be good.

[Example 1]
Ziegler-catalyzed propylene homopolymer [Prime Polypro (registered trademark) manufactured by Prime Polymer Co., Ltd., density 0.90 g / cm ³ , MFR (measured at 190 ° C. temperature, load 21.18 N) 33 g / 10 min, polydispersity ( Mw / Mn) = 3], cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ − as a fatty acid amide (A) having an unsaturated cis structure carbon double bond CH = CH — (— CH ₂ —) ₇ —CH ₃ ; unsaturated fatty acid amide of formula (A ₃ )] (98.0% by mass) and cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ; a mixture of unsaturated fatty acid amides of formula (A ₁ )] (2.0% by mass) into a Ziegler-catalyzed propylene homopolymer. On the other hand, it is blended so that it becomes 4000 ppm. To give a resin composition containing an unsaturated fatty acid amide.

  The obtained resin composition containing the unsaturated fatty acid amide of (A) is supplied to an injection molding machine, and the cap body (1), the overcap (2), and the hinge that are in the open state of 180 degrees are provided. Using a cavity-shaped mold corresponding to the hinge cap provided with the mechanism (3), a hinge cap provided with a membrane hinge was integrally formed by injection molding.

The shape and size of the cap body (1), the overcap (2), and the hinge mechanism (3) of the hinge cap provided with the membrane hinge (3) were as follows.
1) Cap body (1): A substantially cylindrical shape having an outer diameter of 37 mm, an inner diameter of 32 mm, and a height of 27 mm. Outlet diameter 10mm
2) Overcap (2): substantially cylindrical shape with an outer diameter of 37 mm, an inner diameter of 33 mm, and a height of 9 mm 3) Hinge mechanism (3)
Hinge body (3a): cross section of drum with length (oscillation axis direction) 10 mm and maximum width (orthogonal direction of oscillation axis) 4 mm, center thickness 0.2 mm, end thickness 0.3 mm
Edge / center thickness ratio: 1.50
Minimum part / center part thickness ratio: 0.687
Minimum thickness distance ratio: 0.45
Thick part (3b): A rectangular cross section with a width of 1.5 mm and a length of 5 mm at the central part (cap body (1) side and overcap (2) side) of the coupling part of the membrane hinge (3), thickness 1 mm

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Example 2]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [unsaturated fatty acid amide of the formula (A ₁ )] (85.0% by mass) and cis-8,9- hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ; unsaturated fatty acid amide of formula (A ₁₁ )] (15.0 mass%) Except for the change to the mixture, blended to be 130 ppm, and the change in the thickness structure of the membrane hinge (3) with the minimum thickness / center thickness ratio in the membrane hinge (3) of 0.662 In the same manner as in Example 1, a hinge cap provided with a membrane hinge was integrally formed by injection molding.

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Example 3]
The fatty acid amide (A) having an unsaturated cis-structured carbon double bond was changed to single use of cis-13,14-docosenoamide [unsaturated fatty acid amide of formula (A ₃ )] and blended so as to be 3500 ppm. Except for changes, a hinge cap having a membrane hinge was integrally formed by injection molding in the same manner as in Example 2.

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Example 4]
Instead of the Ziegler-catalyzed propylene homopolymer of Example 1, a Ziegler-catalyzed propylene random copolymer (manufactured by Sun Allomer Co., Ltd., density 0.90 g / cm ³ , MFR (measured at a temperature of 190 ° C. and a load of 21.18 N)) 30 g / 10 min, change of synthetic resin using polydispersity (Mw / Mn) = 3], change of blending of fatty acid amide (A) having an unsaturated cis structure carbon double bond to 3500 ppm, and Except for the change in the thickness structure of the membrane hinge (3) with the minimum thickness / center thickness ratio of 0.714 in the membrane hinge (3) being changed to the membrane shape by injection molding in the same manner as in Example 1. A hinge cap provided with a hinge was integrally molded.

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Example 5]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [formula (A ₁ )] (50.0 mass%) and cis-10,11-ethaeicosenoamide [H ₂ N _{-CO - (- CH 2 -)} 8 -CH = CH - (- CH 2 -) 10 -CH 3 ]; changed to a mixture of formula _{(a 2)} of the unsaturated fatty acid amide] (50.0 wt%) Except for the change of the composition so as to be 500 ppm and the change of the thickness structure of the membrane hinge (3) in which the thickness ratio of the minimum part / center part of the membrane hinge (3) is 0.688 In the same manner as in No. 4, a hinge cap having a membrane hinge was integrally formed by injection molding.

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

  For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Example 6]
Unsaturated cis structure fatty acid amide having a carbon double bond (A), to change to a single use of cis-13,14-docosenoamide [unsaturated fatty acid amide of formula (A _3)], was set to be 2000ppm formulation The hinge cap provided with the membrane hinge formed by injection molding is removed from the mold, and then the hinge mechanism (3) is swung so that the hinge cap provided with the membrane hinge is closed. A hinge cap having a membrane hinge was integrally formed by injection molding in the same manner as in Example 5 except that the heat setting performed by heat treatment at a temperature of 40 ° C. for 1 week was not performed.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the molded membrane hinge, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Comparative Example 1]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [unsaturated fatty acid amide of the formula (A ₁ )] (85.0% by mass) and cis-8,9- Change to a mixture of hexadecenoamide [unsaturated fatty acid amide of formula (A ₁₁ )] (15.0% by mass) and change to 5500 ppm, and the thickness of the membrane hinge (3) is minimized The position does not exist between the central part and the end part of the membrane hinge (3), that is, the position where the thickness of the membrane hinge (3) is minimum is the central part of the membrane hinge (3). Yes, therefore, by injection molding in the same manner as in Example 4 except for the change in the thickness structure of the membrane hinge (3) where the minimum thickness / center thickness ratio in the membrane hinge (3) is 1.000. A hinge cap provided with a membrane hinge was integrally formed.

  After the hinge cap provided with the film-like hinge formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung so that the hinge cap provided with the film-like hinge is closed and the temperature is 40 ° C. Heat-fixed by heat treatment for 1 week.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the film-like hinge after heat setting, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state is repeated 50 times. As a result, a slightly stronger click feeling was felt. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

[Comparative Example 2]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond corresponds to the trans-9,10-octadecenoamide [trans structure of the unsaturated fatty acid amide of the formula (A ₁ ). ) Change to (single use), change the formulation to 2000 ppm, and after removing the hinge cap with the membrane hinge formed by injection molding from the mold, swing the hinge mechanism (3) A film-like hinge is provided by injection molding in the same manner as in Comparative Example 1 except that the hinge cap is closed and the heat setting performed by heat treatment at a temperature of 40 ° C. for one week is not performed. A hinge cap was integrally formed.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the molded membrane hinge, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, a slightly stronger click feeling was felt. In addition, Table 1 shows the results of performing chute clogging evaluation on the hinge cap provided with this membrane hinge.

  From the results of Table 1, the cap body (1), the overcap (2), and the film-like shape formed from a synthetic resin containing 130 to 4000 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond A hinge cap having a hinge mechanism (3) of a hinge and comprising a membrane hinge integrally formed from a synthetic resin, wherein the thickness at the end of the membrane hinge (3) is greater than the thickness at the center portion, And the hinge cap provided with the film-like hinges of Examples 1 to 6 where the position where the thickness of the film-like hinge (3) is the minimum exists between the central part and the end part maintains a pleasant click feeling. As a result, it was excellent in snapping property, and the evaluation of clogging of the chute was “◯”, suggesting that the cap supply transportability was good in the step of attaching the cap to the container.

  On the other hand, although the thickness at the end of the membrane hinge (3) is larger than the thickness at the center, the position where the thickness of the membrane hinge (3) is the smallest is the center and the end. And the hinge cap of Comparative Example 1 containing a large amount of fatty acid amide (A) having an unsaturated cis structure carbon double bond in an amount of 5500 ppm, and further, an unsaturated cis structure The hinge cap of Comparative Example 2 that does not contain the fatty acid amide (A) having a carbon double bond has a strong click feeling and a shoot clogging evaluation of “x”, and the cap is supplied in the step of attaching the cap to the container. It was suggested that the transportability of this was not good.

The present invention relates to a cap main body attached to the mouth and neck of a container, an overcap covering the top of the cap main body, and the overcap swinging between a closed state and an open state with respect to the cap main body A hinge cap integrally formed from a synthetic resin, having a hinge mechanism that can be connected, and includes the following a) to c):
a) The hinge mechanism is a hinge mechanism of a membrane hinge in which both end portions are coupled along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively.
b) The membrane hinge is
b-1) The thickness at the end is greater than the thickness at the center of the membrane hinge,
b-2) A position where the thickness of the membrane hinge is minimized exists between the central portion and the end portion, and
c) The hinge mechanism is composed of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond.
By being a hinge cap comprising a membrane hinge characterized by
Since it is possible to provide a hinge cap provided with a membrane hinge integrally molded from a synthetic resin, which has good snap property, durability and operability, and good transportability in cap supply, it is industrially High availability.

1: Cap body 1a: Screw part 2: Overcap 3: Hinge mechanism (membrane hinge)
3a: Hinge body 3b: Thick part 3c: Both side parts 4: Outlet D: Cap support device (delivery device)
b: container c: cap d: cap supply means e: capper f: gripper

Claims (13)

A cap main body attached to the mouth and neck of the container, an overcap covering the top of the cap main body, and the overcap connected to the cap main body so as to be swingable between a closed state and an open state A hinge cap integrally formed from a synthetic resin and having a hinge mechanism, which includes the following a) to c):
a) The hinge mechanism is a hinge mechanism of a membrane hinge in which both end portions are coupled along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively.
b) The membrane hinge is
b-1) The thickness at the end is greater than the thickness at the center of the membrane hinge,
b-2) A position where the thickness of the membrane hinge is minimized exists between the central portion and the end portion, and
c) The hinge mechanism is composed of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond.
A hinge cap comprising a membrane hinge characterized by the above.   The hinge cap provided with the membrane hinge according to claim 1, wherein the cap body, the overcap and the hinge mechanism are made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. The fatty acid amide (A) having an unsaturated cis structure carbon double bond is the following (A ₁ ), (A ₂ ) and (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
A hinge cap comprising a membrane hinge according to claim 1 or 2, which contains at least one fatty acid amide represented by one formula selected from the group consisting of: The fatty acid amide (A) having an unsaturated cis structure carbon double bond is represented by the fatty acid amide represented by the formula (A ₁ ) and the formula (A ₂ ) or (A ₃ ). A hinge cap comprising a membrane hinge according to claim 3, which is a mixture with at least one fatty acid amide. It said (A ₂₎ m in fatty acid amide of the formula of, m = n + 1 or m = n-1 hinge cap comprising a film-like hinge according to claim 4, wherein. The hinge cap provided with the membrane hinge according to claim 4, wherein k in the fatty acid amide represented by the formula (A ₃ ) is k = n. The fatty acid amide (A) having an unsaturated cis-structure carbon double bond is a fatty acid amide represented by the above formula (A ₁ ), and the following (A ₁₁ ):
(A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10, j ≠ n.);
A hinge cap comprising a membrane hinge according to claim 4, which is a mixture with a fatty acid amide represented by the formula:   The fatty acid amide (A) having an unsaturated cis structure carbon double bond contains a compound having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure. A hinge cap comprising the membrane hinge according to claim 1.   The hinge comprising the membrane hinge according to any one of claims 1 to 8, wherein the synthetic resin containing the fatty acid amide (A) having an unsaturated cis structure carbon double bond further contains a saturated fatty acid amide. cap.   A hinge cap comprising the membrane hinge according to any one of claims 1 to 9, wherein the synthetic resin contains polyolefin.   The hinge cap provided with the membrane hinge according to claim 10, wherein the polyolefin is a propylene resin. The hinge cap provided with the membrane hinge according to any one of claims 1 to 11, wherein the membrane hinge has a thick portion. A step of closing a hinge cap comprising the membrane hinge according to any one of claims 1 to 12;
Heat-fixing a hinge cap comprising the membrane hinge in a closed state;
A method for manufacturing a hinge cap including a membrane hinge.

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