JP2010155646A - Lid having rubber stopper and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid having rubber a stopper that has great adhesion strength for a rubber stopper 3 relative to a lid body 2 made of plastic and that enables easy mass production by insert molding, and to provide a method for manufacturing the same. <P>SOLUTION: Using the rubber stopper 3 as an insert, the lid body 2 made of plastic is inserted molded. Thereby, the lid 1 having rubber a stopper, which has the lid body 2 and the rubber stopper 3 joined to the internal surface of the lid body 2, is manufactured. In this case, of the organic components of an addition agent for the rubber of a rubber composition composing the rubber stopper 3, the total of the amount of paraffin oil as a mineral-based softening agent for rubber, naphthene, and aroma oil, and the amount of calcium palmitate as vegetable-based softening agent for rubbers, calcium sterarate, ricinoleate calcium, and calcium laurate, is 1.0 wt.% or less of the rubber composition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a lid with a rubber plug provided with a plastic lid body and a rubber stopper joined to the inner surface of the lid body, and a method for manufacturing the lid, and in particular, a medical container. The present invention also relates to a lid with a rubber stopper that is optimal as a lid for a pharmaceutical container and a method for producing the same.

  2. Description of the Related Art A container having a plastic container body and a lid with a rubber stopper is used as a container for pharmaceuticals such as liquids. Such a lid with a rubber stopper of a pharmaceutical container is composed of a rubber stopper and a plastic lid body to which the rubber stopper is attached, as disclosed in Patent Document 1, for example. In this case, by placing the uncrosslinked rubber sheet and a pair of upper and lower film materials for lamination laminated on the upper and lower outer surfaces between the upper and lower molds, and then heating and pressurizing the rubber stopper, Molded. The rubber plug is composed of a rubber plug main body made of rubber and a plastic laminate film formed on the outer peripheral surface of the rubber plug main body. Further, when attaching the rubber plug to the lid body, the rubber plug is overlaid on the previously formed lid body, and then both are heat-pressed. For this reason, since the laminated film of the rubber plug is fused to the lid body, the rubber plug can be attached to the lid body.

Japanese Patent Laid-Open No. 2-1275

However, in the case of the lid with a rubber stopper of the above-described pharmaceutical container disclosed in Patent Document 1, the rubber stopper is a pair of upper and lower laminates bonded to the uncrosslinked rubber sheet and the upper and lower outer surfaces thereof. The film material is laminated between a pair of upper and lower molds and then heated and pressed to form a laminate. For this reason, in this case, the rubber plug manufacturing process becomes complicated.
Japanese Patent Laid-Open No. 2-1275

  The present invention was invented to remedy the drawbacks of the conventional lid with a rubber stopper and the manufacturing method thereof as described above.

  According to a first aspect of the present invention, in the lid with a rubber plug, comprising the plastic lid body and a rubber stopper joined to the inner surface of the lid body, the rubber plug is configured as described above. Among the organic components of the rubber additive of the rubber composition used, the amount of paraffin oil, naphthene and aroma oil as the mineral softener for rubber, and calcium palmitate and stear as the plant softener for rubber The total amount of calcium phosphate, calcium ricinoleate and calcium laurate is 1.0% by weight or less of the rubber composition, and the lid body is insert-molded using the rubber plug as an insert. The present invention relates to a lid with a rubber stopper, which is characterized in that

According to a second aspect of the present invention, in the lid with a rubber plug provided with a plastic lid body and a rubber plug joined to the inner surface of the lid body, the rubber plug Among the organic components of the rubber additive of the rubber composition constituting the rubber composition, the amount of paraffinic softener, naphthenic softener and aroma softener as the rubber mineral softener, and the plant system for rubber The total amount of calcium palmitate, calcium stearate, calcium ricinoleate and calcium laurate as softeners is 1.0% by weight or less of the rubber composition, and the lid is formed using the rubber plug as an insert. The present invention relates to a lid with a rubber plug, which is constituted by insert molding of a body main body.

  According to a third aspect of the present invention, in the lid with a rubber plug, comprising the plastic lid body and a rubber stopper joined to the inner surface of the lid body. Of the organic components of the rubber additive of the rubber composition constituting the amount of paraffin oil, naphthene and aroma oil as a mineral softener for rubber, and calcium palmitate as a plant softener for rubber The total amount of calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid and lauric acid is 1.0% by weight or less of the rubber composition, and the rubber plug is inserted. It is used as a cover with a rubber stopper, characterized in that it is configured by insert molding the cover body. That.

  According to a fourth aspect of the present invention, in the lid with a rubber plug, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body. Among the organic components of the rubber additive of the rubber composition constituting the rubber composition, the amount of paraffinic softener, naphthenic softener and aroma softener as the rubber mineral softener, and the plant system for rubber The total amount of calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid and lauric acid as a softening agent is 1.0% by weight or less of the rubber composition. A lid with a rubber plug, characterized in that the lid is formed by insert molding the lid body using the rubber plug as an insert. Which relate.

  According to a fifth aspect of the present invention, in the lid with a rubber plug, comprising: a plastic lid body; and a rubber stopper joined to the inner surface of the lid body. Of the organic components of the rubber additive of the rubber composition constituting the amount of paraffin oil, naphthene and aroma oil as a mineral softener for rubber, and calcium palmitate as a plant softener for rubber , Calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid, lauric acid, cottonseed oil, soybean oil, castor oil, palm oil, pine tar oil, tall oil and factice 1.0% by weight or less of the composition, and using the rubber stopper as an insert, the lid body is an insert component. It relates to a rubber stopper with a lid, characterized in that is constituted by.

  According to a sixth aspect of the present invention, in the lid with a rubber plug, comprising: a plastic lid body; and a rubber stopper joined to the inner surface of the lid body. Among the organic components of the rubber additive of the rubber composition constituting the rubber composition, the amount of paraffinic softener, naphthenic softener and aroma softener as the rubber mineral softener, and the plant system for rubber Calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid, lauric acid, cottonseed oil, soybean oil, castor oil, palm oil, pineapple oil, tall oil and factice as softeners And the total amount of the rubber composition is 1.0% by weight or less of the rubber composition, and the lid body is formed using the rubber stopper as an insert. It relates to a rubber stopper with a lid, characterized in that is constituted by concert molding.

  Further, according to a seventh aspect of the present invention, in the lid with a rubber plug, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body. Of the organic components of the rubber additive of the rubber composition constituting the rubber composition, the sum of the amount of the mineral softener for rubber and the amount of the plant softener for rubber is It is 1.0 weight% or less, It is based on the lid body with a rubber plug characterized by comprising insert-molding the said cover body main body using the said rubber plug as an insert.

  In addition, according to an eighth aspect of the present invention, in the lid with a rubber plug, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body. The amount (in other words, the sum total) of the rubber softeners among the organic components of the rubber additive of the rubber composition constituting the rubber composition is 1.0% by weight or less of the rubber composition, The present invention relates to a lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert.

  Moreover, the present invention, in its ninth aspect, is a method for producing a lid with a rubber plug in the above first to eighth aspects, wherein the rubber plug as an insert is in the cavity of the first mold, The rubber plug is disposed in a state where the upper surface side of the upper plate portion of the rubber plug is exposed to the outside of the cavity. At this time, substantially the entire outer peripheral surface of the upper plate portion of the rubber plug is provided in the first mold. A cover having a rubber plug, wherein the lid is covered with a substantially ring-shaped projecting portion, the second mold is combined with the first mold, and then insert molding is performed. It concerns the method.

  In the first aspect of the first to ninth aspects of the present invention, the lid body can be a cap body configured substantially in a cap shape. Moreover, in the 2nd aspect in the said 1st-9th viewpoint, the said lid with a rubber stopper can be a lid for a bottle.

  In the third embodiment of the first to ninth aspects of the present invention, only the paraffin oil is included in the rubber composition among the mineral softener for rubber and the plant softener for rubber. Can be. Moreover, in the 4th aspect in the said 1st-9th viewpoint, the rubber component of the said rubber composition part can be a butadiene rubber. In the fifth aspect of the first to ninth aspects, the lid with a rubber stopper may be a lid for a medical container and / or a pharmaceutical container. Moreover, in the 6th aspect in the said 1st-9th viewpoint, the said lid with a rubber stopper can be a substantially cap-shaped lid for the bottle for accommodating a sterilized purified water. Moreover, in the 7th aspect in the said 1st-9th viewpoint of this invention, it is preferable that the said sum total is the range of 0.01-0.5 weight% of the said rubber composition. In this case, the total sum is more preferably in the range of 0.02 to 0.1% by weight of the rubber composition. Moreover, in the 9th aspect in the said 1st-9th viewpoint, the quantity of the rubber component of the said rubber composition can be the range of 20-60 weight%. This range is preferably 25 to 55% by weight, more preferably 30 to 50% by weight.

  In the ninth aspect of the first to ninth aspects of the present invention, the amount of inorganic components such as a reinforcing agent and a vulcanization accelerator in the rubber additive of the rubber composition is the rubber composition. In the range of 40 to 80% by weight. This range is preferably 45 to 75% by weight, and more preferably 50 to 70% by weight. In this case, the amount of the reinforcing agent such as carbon black and aluminum silicate in the inorganic component may be in the range of 30 to 70% by weight. This range is preferably 35 to 65% by weight, and more preferably 40 to 60% by weight. Moreover, the quantity of vulcanization accelerators, such as magnesium oxide among the said inorganic components, can be the range of 2-25 weight% of the said rubber composition. This range is preferably 4 to 18% by weight, and more preferably 6 to 16% by weight.

  In the tenth aspect of the first to ninth aspects of the present invention, among the rubber additives of the rubber composition, a rubber softener (in other words, a hexane-soluble component), an antioxidant ( In other words, the amount of organic components such as THF-soluble component and methanol-soluble component can be in the range of 0.3 to 8% by weight. This range is preferably 0.6 to 6% by weight, and more preferably 1 to 4% by weight.

  In the eleventh aspect of the first to ninth aspects of the present invention, the lid body is integrally extended downward from the upper plate portion and the outer periphery of the upper plate portion. An annular side plate portion that is substantially ring-shaped as a whole, and the rubber plug is configured to have a diameter smaller than the inner diameter of the annular side plate portion, and is joined to the inner side surface of the upper plate portion. A substantially ring-shaped groove is provided on the inner surface of the upper plate portion of the lid body corresponding substantially between the outer peripheral surface of the upper plate portion of the rubber plug and the inner peripheral surface of the annular side plate portion. It is preferable.

  In a twelfth aspect of the ninth aspect of the present invention, the substantially ring-shaped protruding portion protrudes outward from the upper surface of the upper plate portion of the rubber plug toward the opening side of the cavity. Is preferred. In this case, the height of the protrusion of the substantially ring-shaped protrusion is 2 mm or less. Further, the height of the protrusion of the substantially ring-shaped protrusion is preferably in the range of 0.1 to 1.5 mm, and more preferably in the range of 0.2 to 1 mm. . In the thirteenth aspect of the ninth aspect, the insert molding is preferably insert molding by injection molding.

  According to the inventions according to claims 1 to 8, 11, 12, 18 and 23, a lid with a rubber plug comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body. The body can be easily mass-produced by insert molding using a pre-formed rubber plug as an insert.

  In addition, according to the inventions according to claims 1 to 10, 13 to 16, and 18, medical and pharmaceutical bottles containing sterilized purified water and the like that have a high adhesive strength of the rubber plug to the plastic lid body. It is possible to provide a lid with a rubber stopper having a substantially cap shape or the like.

  Furthermore, according to the inventions according to claims 17 to 22, even when the amount of the rubber softening agent is small, when the plastic lid body is insert-molded using a pre-molded rubber stopper as an insert, the rubber There is no possibility that the rubber composition present on the upper surface of the stopper will flow radially outward by the heat fluidized plastic and adversely affect the color tone of the plastic lid body.

It is the perspective view seen from diagonally upward of the cap with a rubber stopper by one Example of this invention. (Example 1) It is a longitudinal cross-sectional view which shows the state which mounted | wore the container body with the cap with a rubber stopper shown in FIG. (Example 1) It is a top view of the rubber stopper used for the cap with a rubber stopper shown in FIG. (Example 1) It is sectional drawing in the AA of FIG. (Example 1) It is the perspective view seen from diagonally upward of the rubber stopper shown in FIG. (Example 1) It is the perspective view seen from diagonally downward of the rubber stopper shown in FIG. (Example 1) It is a perspective view similar to FIG. 1 in the modification of the cap with a rubber stopper shown in FIG. (Example 2) It is a longitudinal cross-sectional view which shows the 1st process in one Example of the method of manufacturing the cap with a rubber stopper shown in FIG. (Example 1) It is a longitudinal cross-sectional view which shows the 2nd process in the cap manufacturing method shown in FIG. (Example 1) It is a longitudinal cross-sectional view which shows the 3rd process in the cap manufacturing method shown in FIG. (Example 1) It is a longitudinal cross-sectional view which shows the 4th process in the cap manufacturing method shown in FIG. (Example 1) It is an enlarged view of the area | region I in FIG. (Example 1) It is a longitudinal cross-sectional view which shows an example which measures the adhesive strength of the rubber stopper with respect to a plastic cap main body. (Reference Example 1)

  Next, embodiments of the lid with a rubber plug and the manufacturing method thereof according to the present invention are described in “1, Structure of the lid with rubber plug”, “2, Manufacturing method of the lid with rubber plug” and “3, Rubber plug” The composition will be divided into “compositions” and described with reference to the drawings.

1. Structure of lid with rubber plug As shown in FIGS. 1 and 2, a cap 1 with a rubber plug as a lid with a rubber plug according to one embodiment of the present invention is a plastic cap body as a lid body. 2 and a rubber plug 3 made of rubber attached to the inner side surface of the cap main body 2. The cap body 2 can be manufactured from polypropylene resin, polyethylene resin, polystyrene resin, and other various plastics, but it is particularly preferable that the cap body 2 is manufactured from polypropylene resin. The rubber plug 3 may be constituted by a rubber composition comprising a rubber component and a rubber additive. In particular, the rubber plug 3 has one feature that it does not include the laminate film as described above. As the rubber component of the rubber plug 3, butadiene rubber, styrene-butadiene rubber, natural rubber, and other various rubbers can be used, and it is particularly preferable to use butadiene rubber. The rubber additive added to the rubber component of the rubber plug 3 will be described in detail in the section “3. Composition of the rubber plug” below.

  As shown in FIGS. 1 and 2, the cap body 2 is integrally formed with an upper plate portion 4 that may have a substantially plate shape such as a substantially disk shape, and downward from the outer periphery of the upper plate portion 4. The annular side plate portion 5 is extended and may be substantially ring-shaped such as a substantially ring shape as a whole. A female screw portion 7 is formed on the inner peripheral surface of the annular side plate portion 5 by a protruding ridge portion 6 extending in a spiral shape. An annular lower end portion 9 is integrally connected to the lower end side of the annular side plate portion 5 via a plurality of narrow connecting portions 8. In other words, a substantially annular slit 31 is formed between the annular side plate portion 5 and the annular lower end portion 9. The connecting portion 8 exists in the slit 31. A plurality of spacer portions 32 and a plurality of cutting assisting portions 33 are integrally connected to the lower end side of the annular side plate portion 5. Further, a plurality of cutting aids 34 are integrally connected to the upper end side of the annular lower end 9 so as to correspond to the plurality of cutting aids 33, respectively. The plurality of spacer portions 32 and the plurality of cutting assisting portions 33 and 34 are also present in the slit 31. In addition, since the structure of these connection part 8, the spacer part 32, and the cutting assistance parts 33 and 34 is known, the detailed description is abbreviate | omitted.

  Near the outer periphery of the inner surface of the upper plate portion 4, a substantially ring-shaped groove 10 such as a substantially annular shape is provided substantially along the inner surface of the annular side plate portion 5. And this groove | channel 10 is adjacent to the outer peripheral surface of the upper-plate part 11 of the rubber stopper 3 in radial direction outward. Therefore, the groove 10 is formed on the inner surface of the upper plate portion 4 between the outer peripheral surface of the upper plate portion 11 and the inner surface of the annular side plate portion 5. The reason why the groove 10 is provided will be described in detail in the section of “2. Manufacturing method of lid with rubber stopper” below.

  As shown in FIGS. 2 to 6, the rubber plug 3 has an upper plate portion 11 as a rubber packing body that may have a substantially plate shape such as a substantially disk shape, and downward from the lower surface of the upper plate portion 11. And an annular side plate portion 12 which may be substantially ring-shaped such as a ring shape as a whole. The annular side plate portion 12 is considerably smaller in diameter than the upper plate portion 11 and has a shape retaining function and a reinforcing function of the upper plate portion 11. Further, a shallow concave portion 13 that substantially corresponds to the shape of the inner peripheral surface of the annular side plate portion 12 is formed on the upper surface of the upper plate portion 11. And the low protrusion part 14 which has a shape substantially corresponding to the shape of this shallow recessed part 13 is formed in the lower surface of the upper-plate part 4 of the cap main body 2. As shown in FIG. Further, a plurality of substantially annular protrusions 15 are formed on the outer peripheral surface of the annular side plate portion 12.

  A plurality of short projecting portions 16 projecting radially inward toward the shallow recessed portion 13 are also formed on the upper surface of the upper plate portion 11. A plurality of small-diameter projections are provided at substantially equal intervals on a portion further outside the shallow concave portion 13 (in other words, an annular portion in the outer periphery) in the upper surface of the upper plate portion 11 of the rubber plug 3. 17 is integrally projected. Similarly, a plurality of small-diameter projections 18 are integrally projected on the lower surface of the annular side plate portion 12 of the rubber plug 3 at substantially equal intervals. The small-diameter projections 17 and 18 have a function of preventing the rubber plugs 3 from unnecessarily sticking when the plurality of rubber plugs 3 are overlapped with each other in the manufacturing process of the rubber plug 3. is doing. The rubber plug 3 is attached to the inner side surface of the upper plate portion 4 of the cap body 2. In this regard, “2, manufacturing method of lid with rubber plug” and “3, rubber plug” will be described later. This is described in detail in the section “Composition of

  As shown in FIG. 2, the cap 1 with a rubber stopper can be attached to a mouth portion 22 of a bottle 21 as a container body. For this purpose, a male screw portion 23 is formed on the outer periphery of the mouth portion 22. Then, the female screw portion 7 of the cap body 2 can be screwed into the male screw portion 23 so as to be able to be screwed back. In this case, although the details are omitted, the annular lower end portion 9 is press-fitted into the outer peripheral surface of the lower portion of the mouth portion 22 of the container body 21 so as not to rotate in the screw-back direction as is well known. For this reason, at the time of the unscrewing, the annular lower end portion 9 is separated from the annular side plate portion 5 by cutting the connecting portion 8. Further, at the time of screwing, the lower surface near the outer periphery of the upper plate portion 11 of the rubber plug 3 is pressure-bonded in an airtight manner near the upper end of the mouth portion 22. Therefore, the rubber plug 3 functions as a rubber packing with respect to the mouth portion 22 of the container body 21. The container main body 21 can be manufactured from polypropylene resin, polyethylene resin, polystyrene resin, and other various plastics in the same manner as the cap main body 2, but is manufactured from substantially the same plastic as the cap main body 2. More specifically, it is preferably produced from a polypropylene resin.

  FIG. 7 shows a modification of the cap 1 with a rubber stopper shown in FIGS. 1 and 2. In FIG. 7, parts common to those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted as necessary.

  The cap 1 with a rubber stopper shown in FIG. 7 is substantially different from the cap 1 with a rubber stopper shown in FIGS. 1 and 2 in that the cap body 2 of the cap 1 with a rubber stopper shown in FIGS. The upper plate portion 4 does not have a central through hole, whereas the upper plate portion 4 of the cap body 2 of the cap 1 with a rubber plug shown in FIG. For this reason, in the case of the cap 1 with a rubber plug shown in FIG. 7, the upper surface of the upper plate portion 11 of the rubber plug 3 is exposed to the outside through the central through hole 24. Therefore, when a liquid such as a medicine stored in the container body 21 is taken out, an injection needle of a syringe (not shown) is inserted into the upper plate portion 11 of the rubber stopper 3 through the central through hole 24 and this upper plate portion. By penetrating 11, a liquid such as a medicine can be injected into the syringe through the injection needle.

  1 to 6 and a container 25 having the container main body 21 shown in FIG. 2, a container 25 having the rubber stopper cap 1 shown in FIG. 7 and the container main body 21 shown in FIG. Can be used as a container (in other words, a bottle) for medical use or pharmaceutical use. Especially the container 25 provided with the cap 1 with a rubber stopper shown in FIGS. 1-6 can be used suitably as a container which accommodates liquids, such as sterilized purified water and other various pharmaceuticals. Moreover, the container 25 provided with the cap 1 with a rubber stopper shown in FIG. 7 can be used suitably as a container which accommodates an injection solution.

2. Manufacturing method of cover with rubber plug When manufacturing the cap 1 with a rubber plug as a cover with a rubber plug, first, the rubber plug 3 made of the rubber composition is manufactured. In manufacturing the rubber plug 3, the rubber plug 3 can be manufactured from a molding material composed of a rubber component, a rubber additive, and a crosslinking agent by various molds such as injection molding. The rubber composition constituting the rubber plug 3 will be described in detail in the section “3. Composition of rubber plug” below.

  Next, as shown in FIGS. 8 to 12, the cap body 2 with the rubber stopper is insert-molded by injection-molding the cap body 2 with the rubber stopper 3 being placed in the mold as an insert.

  In this insert molding, first, as shown in FIGS. 8 and 9, a rubber plug 3 as an insert is inserted into a cavity 42 of a lower main mold (in other words, a male mold) 41 as a first mold. Are fitted in a state where the upper surface side of the upper plate portion 11 is exposed to the outside.

  Next, as shown in FIGS. 9 and 10, an upper main mold (in other words, a female mold) 43 serving as a second mold is placed on the lower main mold 41 from above, so that The pair of lands 41a and 43a of the main molds 41 and 43 are abutted with each other via auxiliary molds 47a and 47b described later. As a result of this butting, the lower main mold 41 and the rubber plug 3 and the upper main mold 43 are substantially the same shape as the cap main body 2 shown in FIGS. 1 and 2, as shown in FIG. A plastic molding cavity 45 is formed.

  In the above, only the lower main mold 41 and the upper main mold 43 have been mainly described as the mold. However, in practice, as is well known, a plurality of auxiliary molds for forming the connecting portion 8, the slit 31, the spacer portion 32, and the cutting assisting portions 33 and 34 of the cap body 2 shown in FIGS. 1 and 2. 47a and 47b need to be used.

  Next, as shown in FIGS. 11 and 12, the heated and fluidized plastic is pushed into the plastic molding cavity 45 by an injection ram (not shown), and is insert-molded. As a result, the cap 1 with a rubber stopper shown in FIGS. 1 and 2 is insert-molded by injection molding.

  A substantially ring-shaped portion 46 adjacent to the outer periphery of the upper surface of the rubber plug 3 in the lower main mold 41 is located above the upper surface of the rubber plug 3 as shown in FIGS. It protrudes to form a substantially ring-shaped protrusion. For this reason, the heat fluidized plastic that has flowed into the plastic molding cavity 45 flows radially outward along the upper surface of the rubber plug 3 in order to be blocked from reaching the substantially annular projection 46. There is hardly anything. Therefore, there is no possibility that the rubber composition existing on the upper surface of the rubber plug 3 will flow radially outward by the heat fluidized plastic and adversely affect the color tone of the cap body 2. This is the same in the case of Experimental Examples 1 and 2 shown in Table 1 below. In other words, in the case of Experimental Examples 1 and 2 shown in Table 1 to be described later, the amount of the paraffinic softening agent in the organic component of the rubber additive in the rubber composition is such that this kind of rubber plug 3 is used. Compared with a rubber composition conventionally used as a rubber composition (that is, 4.08% by weight in the case of the reference example in Table 1 described later), it is extremely small, 0.06% by weight and 0.01% by weight. However, even in the case of Experimental Examples 1 and 2 in which the amount of the paraffin softener is extremely small, the radial direction of the rubber composition as described above can be obtained by using the mold structure shown in FIGS. The outward flow can be effectively prevented.

  In the illustrated embodiment, as shown in FIG. 12, the protrusion height H of the substantially ring-shaped protrusion 46 is about 0.35 mm, and the protrusion width (in other words, the radial length) W is about 1.25 mm. However, the protrusion height H (in other words, the depth of the groove 10) is generally preferably in the range of 0 to 2 mm from the viewpoint of practicality, preferably 0.1 to 1.5 mm. More preferably, it is in the range, and most preferably in the range of 0.2 to 1 mm. In general, the protrusion width W is preferably in the range of 0.4 to 6 mm, more preferably in the range of 0.6 to 4.5 mm, from the viewpoint of practicality. Most preferably, it is in the range of 8-3 mm. In other words, it is preferable that the entire side surface (in other words, the outer peripheral surface) of the upper plate portion 11 of the rubber plug 3 is covered with the substantially ring-shaped protrusion 46 and not exposed to the plastic molding cavity 45. . In other words, the upper surface of the rubber plug 3 (specifically, the upper surface of the upper plate portion 11) is closer to the plastic molding cavity 45 than the annular protrusion 46 (in other words, the lower main mold). It is preferable that it does not protrude toward the outside of the opening side of the cavity 42 of 41.

3. Composition of rubber plug As described in the sections of “1, Structure of lid with rubber plug” and “2, Manufacturing method of lid with rubber plug”, rubber plug 3 manufactured by molding or the like The rubber composition that constitutes is substantially composed of a rubber component such as butadiene rubber and various rubber additives added to the rubber component. The rubber additive may be both an inorganic component and an organic component. The inorganic component may be, for example, about 60% by weight of the rubber composition. The inorganic component includes, for example, about 30% by weight of carbon black as a reinforcing agent, 20% by weight of kaolin clay (that is, aluminum silicate) as a reinforcing agent, and about 10% by weight of magnesium oxide as a vulcanization accelerator. Can be used. Moreover, an organic component can be about 2 weight% of the said rubber composition, for example. The organic component includes, for example, about 0.06% by weight of paraffin oil as a paraffinic softener for rubber, about 1.90% by weight of Irganox 1076 (registered trademark) as an antioxidant for rubber, and methanol. About 0.01% by weight of a soluble component (ie, a component dissolved in methanol) can be used. Therefore, the rubber component in the rubber composition may be about 38% by weight, for example. Experimental Example 1 in Table 1 below shows the rubber composition described above.

In Experimental Example 2 in Table 1, the amount of paraffin oil as a paraffin softener for rubber is further reduced. In this case, the paraffin oil is added at 0.01% by weight or less of the rubber composition. Moreover, the reference example in the said Table 1 has shown what was generally used conventionally as a rubber composition of the rubber plug main body in the case of having a laminate film like the rubber plug shown in patent document 1.
Japanese Patent Laid-Open No. 2-1275

  The adhesiveness of the rubber plug 3 with the cap body 2 in Table 1 was measured as shown in FIG. In FIG. 13, a cap body 2 is a cap body shown in FIGS. 1 and 2 provided with a central through hole 24 as shown in FIG. Therefore, the cap body 2 in FIG. 13 may have substantially the same structure as the cap body shown in FIG. Further, the rubber plug 3 shown in FIG. 13 may have substantially the same shape as the rubber plug shown in FIGS. 1 and 2 (in other words, FIG. 7). Furthermore, the code | symbol 51 in FIG. 13 has shown the metal rods made from steel, such as an elongate cylindrical shape.

In the section of “Adhesiveness with the cap body 2” in Table 1, “good” means that even if a force of 60 to 80 N is applied to the metal bar 51 downward in the length direction in FIG. This means that the stopper 3 does not peel from the cap body 2. Further, “defective” means that the rubber plug 3 is peeled off from the cap body 2 only by applying a force of 4 to 6 N to the metal rod 51 in the downward direction in the length direction. Here, “N (Newton)” is a unit of force of the MKS system and means a force that gives an acceleration of 1 m / sec ² to a universal mass of kg.

  “Elemental analysis of rubber composition” in Table 1 indicates numerical values obtained by elemental analysis of the entire rubber composition constituting the rubber plug 3 (in other words, the entire rubber plug 3). On the other hand, a surface layer (in other words, the surface of the rubber plug 3) of about 0.05 mm thick on the upper surface of the upper plate portion 11 of the rubber plug 3 (in other words, the surface bonded to the upper plate portion 4 of the cap body 2). The numerical value obtained by elemental analysis of the portion that substantially contributes to the adhesion to the cap body 2 is substantially the same as the numerical value obtained by elemental analysis of the entire rubber composition (in other words, the numerical value shown in Table 1). Met. Therefore, it has been found that the adhesiveness of the rubber plug 3 with the cap body 2 in Table 1 is substantially determined according to the composition of the entire rubber composition.

  First, in the case of the rubber plug 3 having the rubber composition shown as a reference example (in other words, a conventional example) in Table 1, the inventor described in “2. Production of a lid with a rubber plug”. It has been found that the rubber plug 3 cannot be firmly bonded to the cap body 2 by insert molding such as injection molding as described in the section “Method”. Therefore, the present inventor has repeated trial and error with respect to the types of components of the molding material for molding the cap 1 with a rubber stopper by insert molding such as injection molding, the contents of these components, and various molding conditions. . And this inventor is the process of this trial and error and the result shown in Table 1. Of the organic component of the rubber additive of the rubber composition which comprises the rubber stopper 3, the paraffin type softener for rubber | gum is used. By adjusting the amount, the inventors have found that the rubber plug 3 can be firmly bonded to the cap body 2 even by insert molding such as injection molding as described above, and have arrived at the present invention.

  In the present invention, among the organic components of the rubber additive of the rubber composition of the rubber plug 3, a paraffinic softener for rubber (in other words, a hexane-soluble component, and in other words, the above organic component) The upper limit of the rubber softener) is preferably 1.0% by weight of the rubber composition, more preferably 0.5% by weight, and 0.1% by weight. Most preferred. The lower limit of the paraffin softening agent is preferably greater than 0% by weight of the rubber composition, more preferably 0.01% by weight, and most preferably 0.02% by weight. . In these preferred cases, further preferred cases and most preferred cases, the reason why the lower limit of the paraffinic softener is larger than 0% by weight is that the dispersibility of carbon black or the like and the processability of the rubber composition are so lowered. This is because it may be better not to.

  In the present invention, as the rubber softener among the organic components of the rubber additive of the rubber composition of the rubber plug 3, as described above, the mineral softener for rubber (in other words, the mineral oil softener for rubber) ) As a paraffinic softener (specifically, paraffin oil) or in addition to using a paraffinic softener as described above, A group of naphthenic softeners such as naphthene (in other words cycloalkane) and aroma softeners such as aroma oil, and calcium palmitate, calcium stearate, calcium ricinoleate and calcium laurate as plant softeners for rubber At least one selected from among them can be used. In this case as well, the total weight (in other words,% by weight) of the mineral-based and plant-based softeners combined with the at least one softener and the paraffinic softener is the preceding paragraph. The description relating to the numerical values described in the above applies similarly. In addition, when at least one selected from the group of palmitic acid, stearic acid, ricinoleic acid and lauric acid is further added to the group of plant softeners for rubber, the total of all mineral and plant softeners Regarding the weight, it can be estimated very easily that the description relating to the numerical values described in the previous paragraph applies almost similarly. In addition, when at least one selected from the group of cottonseed oil, soybean oil, castor oil, palm oil, pineapple oil, tall oil and factice is further added to the group of plant softeners for rubber, Regarding the total weight of the total softener of the system, it can be easily estimated that the description relating to the numerical values described in the previous paragraph applies almost similarly.

1 Cap with rubber stopper (lid with rubber stopper)
2 Cap body (lid body)
3 Rubber stopper 4 Upper plate portion 5 of cap body Ring-shaped side plate portion 10 Ring-shaped groove 11 Upper plate portion 21 of rubber plug Container body (bin)
41 Lower main mold (first mold and male mold)
42 Cavity 43 Upper main mold (second mold and female mold)
46 Projection H of almost ring shape Projection height

Claims (23)

In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin oil, naphthene and aroma oil as the mineral softener for rubber, and the plant softener as rubber The sum of the amount of calcium palmitate, calcium stearate, calcium ricinoleate and calcium laurate is 1.0% by weight or less of the rubber composition;
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin softener, naphthene softener and aroma softener as the mineral softener for rubber, and rubber The sum of the amount of calcium palmitate, calcium stearate, calcium ricinoleate and calcium laurate as a plant softener is 1.0% by weight or less of the rubber composition,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin oil, naphthene and aroma oil as the mineral softener for rubber, and the plant softener as rubber The total amount of calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid and lauric acid is 1.0% by weight or less of the rubber composition,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin softener, naphthene softener and aroma softener as the mineral softener for rubber, and rubber The total amount of calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid and lauric acid as a plant softener is 1.0 weight of the rubber composition. % Or less,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin oil, naphthene and aroma oil as the mineral softener for rubber, and the plant softener as rubber The sum of the amount of calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid, lauric acid, cottonseed oil, soybean oil, castor oil, palm oil, pine tar oil, tall oil and factice , 1.0% by weight or less of the rubber composition,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the amount of paraffin softener, naphthene softener and aroma softener as the mineral softener for rubber, and rubber Calcium palmitate, calcium stearate, calcium ricinoleate, calcium laurate, palmitic acid, stearic acid, ricinoleic acid, lauric acid, cottonseed oil, soybean oil, castor oil, palm oil, pineapple oil, tall oil and The sum of the amount of factices is 1.0% by weight or less of the rubber composition,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
Of the organic components of the rubber additive of the rubber composition constituting the rubber plug, the sum of the amount of the mineral softener for rubber and the amount of the plant softener for rubber is the rubber composition. 1.0% by weight or less of
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert. In a lid with a rubber stopper, comprising a plastic lid body and a rubber stopper joined to the inner surface of the lid body,
The sum total of the rubber softeners among the organic components of the rubber additive of the rubber composition constituting the rubber plug is 1.0% by weight or less of the rubber composition,
A lid with a rubber plug, wherein the lid body is formed by insert molding using the rubber plug as an insert.   The lid body with a rubber plug according to any one of claims 1 to 8, wherein the lid body is a cap body configured substantially in a cap shape.   The lid with a rubber stopper according to any one of claims 1 to 9, wherein the lid is for a bottle.   The paraffin oil alone is included in the rubber composition among the mineral softener for rubber and the plant softener for rubber. The rubber composition according to any one of claims 1 to 10, A lid with a rubber stopper.   12. The lid with a rubber plug according to claim 1, wherein the rubber component of the rubber composition part is butadiene rubber.   The lid with a rubber stopper according to any one of claims 1 to 12, which is a lid for a medical container and / or a pharmaceutical container.   14. The lid with a rubber stopper according to claim 1, wherein the lid is a substantially cap-shaped lid for a bottle for containing sterilized purified water.   The said sum total is 0.01 to 0.5 weight% of the said rubber composition, The lid | cover with a rubber stopper as described in any one of Claims 1-14 characterized by the above-mentioned.   The said sum total is the range of 0.02 to 0.1 weight% of the said rubber composition, The cover body with a rubber stopper as described in any one of Claims 1-15 characterized by the above-mentioned. The lid body includes an upper plate portion, and an annular side plate portion that extends integrally downward from the outer periphery of the upper plate portion and has a substantially ring shape as a whole,
The rubber plug is configured to have a diameter smaller than the inner diameter of the annular side plate portion, and is joined to the inner surface of the upper plate portion,
A substantially ring-shaped groove is provided on the inner surface of the upper plate portion of the lid body that substantially corresponds between the outer peripheral surface of the upper plate portion of the rubber plug and the inner peripheral surface of the annular side plate portion. The lid with a rubber stopper according to any one of claims 1 to 16. A method for producing a lid with a rubber stopper according to any one of claims 1 to 17,
The rubber plug as the insert is disposed in the cavity of the first mold, and the upper surface side of the upper plate portion of the rubber plug is exposed to the outside of the cavity.
At this time, substantially the entire outer peripheral surface of the upper plate portion of the rubber plug is covered with a substantially ring-shaped protrusion provided in the first mold,
Then, the second mold is combined with the first mold,
Next, a method for producing a lid with a rubber plug, wherein insert molding is performed.   The manufacturing method according to claim 18, wherein the substantially ring-shaped protruding portion protrudes from the upper surface of the upper plate portion of the rubber plug toward the outside of the opening side of the cavity.   The manufacturing method according to claim 19, wherein a height of the protrusion of the substantially ring-shaped protrusion is 2 mm or less.   The manufacturing method according to claim 19, wherein a height of the protrusion of the substantially ring-shaped protrusion is in a range of 0.1 to 1.5 mm.   The manufacturing method according to claim 19, wherein a height of the protrusion of the substantially ring-shaped protrusion is in a range of 0.2 to 1 mm.   The manufacturing method according to any one of claims 17 to 22, wherein the insert molding is insert molding by injection molding.

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