Slide fastener having resin injection-molded component

Abstract

The purpose of the present invention is to enable the use of polyethylene terephthalate (PET) resin as a material that is more broadly usable as a material for a resin injection-molded component of a slide fastener. Specifically, this slide fastener has an injected resin component formed by injection-molding a synthetic resin containing PET as a main constituent into a fastener tape. The synthetic resin of the injected resin component contains a crystal nucleating agent, and the crystallinity thereof is at least 12%. Additionally, where the entirety of the synthetic resin of the injected resin component is 100 wt%, the synthetic resin contains at least 50 ppm of phosphorus and at least 20 ppm of calcium.

Description

Slide fasteners with resin injection molded parts

[0001] This invention relates to a slide fastener in which one of its components is manufactured by resin injection molding. In particular, this invention relates to a slide fastener having an injection-molded component using polyethylene terephthalate (PET) as the resin material, which has not been widely used in general-purpose products mass-produced in the field of slide fasteners until now.

[0002] Traditionally, it has been common practice to manufacture components of slide fasteners, such as fastener elements, stoppers, and openers, by resin injection molding. Figures 1 and 2 show a typical configuration of such a slide fastener.

[0003] As shown in Figure 1, the slide fastener 70 has multiple elements 73 integrally attached to one edge of the fastener tapes 71 and 72 by resin injection molding. An upper stopper 74 is attached to the upper end of each element 73, and a lower stopper 75 is attached to the lower end. These upper and lower stoppers 74 and 75 are also integrally attached to the fastener tapes 71 and 72 by resin injection molding. The elements 73 are engaged by the up and down operation of the slider 76, and a pull tab 77 for operation is attached to the slider 76.

[0004] Fig. 2 is another example of a slide fastener having a component manufactured by resin injection molding, and shows a slide fastener of a type provided with an opening device instead of the bottom stop 75 in Fig. 1. Fig. 2 only describes the structure around the opening device, and the opening device includes an insert pin 93 and a box 94. The box 94 has a box body 95 and a box pin 96 provided to extend from the box body 95 toward the element 73. The box body 95 is provided with an insert pin hole 93a as a space into which the insert pin 93 is inserted. The box body 95 is provided with a tape groove 91a, and both sides of the tape groove 91a form flanges 95a. Further, a resin film 97 is provided on the surfaces of the fastener tapes 91 and 92 adjacent to the insert pin 93 and the box 94. The resin film 97 is provided for the purpose of reinforcing the fastener tape to facilitate the operation of combining the opening device of the slide fastener, and is made of, for example, a polyamide-based film, a polyester-based film, a polyolefin-based film or a polyurethane-based film, and is attached to the fastener tapes 91 and 92 by adhesion or heat welding or the like.

[0005] When resin injection molding is performed on such slide fastener components as the fastener element 73, the top stop 74, the bottom stop 75, the insert pin 93, the box 94 and the like, polyacetal (POM) is preferred and used as a useful resin material. Polyacetal is a resin material excellent in strength, abrasion resistance and heat resistance, and is also excellent as a material for injection molding in a mold. Therefore, it is common to use polyacetal as the resin material used for resin injection-molded parts of mass-produced general-purpose slide fasteners.

[0006] Japanese Patent Application Laid-Open No. 10-243805, Chinese Patent Publication No. 111925632, Japanese Patent Application Laid-Open No. 2003-138114

[0007] In recent years, awareness of sustainable development activities has been increasing throughout the industrial sector. In the field of slide fasteners, attempts have long been made to develop environmentally friendly products. For example, Patent Document 1 describes a proposal for a slide fastener product that takes resin material recycling into consideration. The slide fastener described as an embodiment in Patent Document 1 does not relate to resin injection-molded elements, but rather to a coil fastener using extruded monofilament elements. In particular, it focuses on the effective use of recycled PET (polyethylene terephthalate) as a recycled material. PET is a material that is widely available on the market as a recycled resin material, and its recycling is increasingly in demand. Regarding the use of PET as a material for slide fasteners, as described in Patent Document 1, it has already been put into practical use as a general-purpose product when used as an extruded monofilament. However, its use as an injection-molded part for slide fastener elements, fasteners, and openers has not yet been put into practical use as a general-purpose product. The main reason why it has not been put into practical use is that PET is an unsuitable material for resin injection molding in molds.

[0008] To explain in more detail, when PET is injection molded using the same molds used for conventional slide fastener injection molded parts, that is, the same molds used for injection molding of polyacetal resin, problems such as insufficient filling and poor mold release become significant. In addition, the PET resin cools rapidly, resulting in insufficient crystallization. Therefore, when using PET as a material for slide fastener injection molded parts, it is common practice to use molds that have been heated to a high temperature. The use of molds heated to a high temperature is described, for example, in Patent Documents 2 and 3.

[0009] Paragraph 0038 of Patent Document 2 states that the injection molding mold temperature is 80°C, 50°C, or 60°C, and claim 4 of Patent Document 2 states that the injection molding mold temperature is 30 to 85°C. Furthermore, paragraph 0015 of Patent Document 3 states that the injection molding mold temperature is preferably in the range of 30 to 60°C or 120 to 150°C. As described in Patent Documents 2 and 3 above, using a high-temperature mold resolves some of the problems in resin injection molding of PET into the mold. However, using a high-temperature mold creates another new problem: it significantly reduces manufacturing efficiency. Specifically, the time required from injecting the PET resin to opening the mold and removing the product becomes significantly longer than before, resulting in a significant decrease in manufacturing efficiency. Another problem is that if the slide fastener is of the type with an opening mechanism as shown in Figure 2, the resin film 97 is more likely to become cloudy. In other words, when injection molding a butterfly bar 93, a box 94, and a box bar 96 onto fastener tapes 91 and 92 on which a resin film 97 is provided, if the mold temperature becomes high, excessive heat will be applied to the resin film 97 while pressure is being applied by the mold, causing the resin film 97 to become cloudy.

[0010] Furthermore, while Patent Documents 2 and 3 mention 30 degrees Celsius as the lower limit of the temperature range for high-temperature molds, when injection molding is actually performed at such a relatively low mold temperature range, problems such as insufficient filling and mold release are not adequately improved, and the crystallization of the resin in the extracted product is also insufficient. In particular, the problem of insufficient resin crystallization becomes a significant issue when clothing to which the slide fastener is attached is used in regions where it is customary to wash and dry under high-temperature conditions. For example, in Europe, washing is done at temperatures of 90 degrees Celsius or higher, and washing and drying is done at temperatures of 120 degrees Celsius or higher. If a slide fastener with insufficient resin crystallization is exposed to such high-temperature washing and drying conditions, the injection-molded part may deform, and the slide fastener may not be able to perform its intended opening and closing function.

[0011] This application proposes a slide fastener that solves several such complex and related problems. The aim is to make PET resin a more versatile material for resin injection molded parts of slide fasteners. Achieving this goal will also lead to the wider use of recycled PET resin as a material for slide fasteners, and further contribute to meeting the societal demand for sustainable development activities.

[0012] Furthermore, while the inventors of this application were conducting research to achieve the above objectives, they discovered that when a certain type of antioxidant is used during injection molding, the manufactured resin molded parts become strongly discolored to a gray color. The inventors also discovered that by mixing a certain substance into the PET resin, this gray discoloration can be suppressed. Therefore, one of the objectives of this application is to propose a method that can suppress the graying of PET resin injection molded parts, even when combined with antioxidants. Achieving this additional objective will make the primary objective of using PET material for the practical application of resin injection molded parts for slide fasteners more universally applicable.

[0013] To achieve the above objective, the present invention has the following features.

[0014] The slide fastener in the present invention is a slide fastener in which elements are attached to the edge of a fastener tape, wherein the slide fastener has a resin injection molded part formed by injection molding a synthetic resin mainly composed of polyethylene terephthalate onto the fastener tape, the synthetic resin of the resin injection molded part contains a crystal nucleating agent, and the crystallinity of the resin injection molded part is 12% or more.

[0015] Preferably, the resin injection-molded component is one of the fastener element, bottom fastener, top fastener, butterfly pin, or box, or a combination of several of these.

[0016] Preferably, the resin injection-molded component is a hinge or a box, and a resin film is provided on the fastener tape adjacent to the hinge or box.

[0017] Preferably, the resin injection-molded part is manufactured by injecting it into a mold at a temperature of less than 30°C.

[0018] Preferably, the resin injection-molded part is made from a synthetic resin that does not combine polyethylene terephthalate resin using antimony as a polymerization catalyst, a phosphorus-based antioxidant, and a crystal nucleating agent.

[0019] Furthermore, the slide fastener in the present invention is a slide fastener in which elements are attached to the edge of a fastener tape, and the slide fastener has a resin injection molded part formed by injection molding a synthetic resin mainly composed of polyethylene terephthalate onto the fastener tape, and when the total weight of the synthetic resin of the resin injection molded part is taken as 100%, the synthetic resin contains 50 ppm or more of phosphorus and 20 ppm or more of calcium.

[0020] Preferably, a lubricant containing calcium is included in the synthetic resin.

[0021] Furthermore, preferably, the polyethylene terephthalate in the synthetic resin includes recycled polyethylene terephthalate.

[0022] Furthermore, because the garment uses the slide fastener according to the present invention, it is possible to wash it at high temperatures of 90°C or higher.

[0023] This figure shows a general form of a slide fastener (slide fastener with a bottom stopper) having a part manufactured by resin injection molding, and represents the appearance of the slide fastener in an embodiment of the present invention. This figure shows a general form of a slide fastener (slide fastener with an opening mechanism) having a part manufactured by resin injection molding, and represents the appearance of the slide fastener in an embodiment of the present invention. This figure shows that the upper side of the tape groove 91a of the box 94 has deformed and narrowed after washing at 90°C. This figure shows that the upper side of the tape groove 91a of the box 94 has deformed further after drying at 120°C, and the entire resin has become cloudy. This is a photograph showing the appearance of the injection-molded butterfly rod 93 and box 94 of Reference Example 1. This is a photograph showing the appearance of the injection-molded butterfly rod 93 and box 94 of Reference Example 2. This is a photograph showing the appearance of the injection-molded butterfly rod 93 and box 94 of Reference Example 3. This is a photograph showing the appearance of the injection-molded butterfly rod 93 and box 94 of Reference Example 4. This is a photograph showing the injection-molded butterfly rod 93 and box 94 of Reference Example 5. This is a photograph showing the injection-molded butterfly rod 93 and box 94 of Example 3 in comparison with Reference Example 1. This is a photograph showing the injection-molded butterfly rod 93 and box 94 of Comparative Example 3 in comparison with Reference Example 1.

[0024] The embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the embodiments described below. Furthermore, descriptions of overlapping configurations and functions between embodiments will be omitted in principle.

[0025] Figure 1 is a diagram previously used in the prior art to show a general form of a slide fastener having parts manufactured by resin injection molding, but it also represents the appearance of the slide fastener in the embodiment of the present invention. Figure 2 is also a diagram showing a general form of a slide fastener (slide fastener with a latch) having parts manufactured by resin injection molding, and it represents the appearance of the slide fastener (slide fastener with a latch) in the embodiment of the present invention. Thus, the embodiment of the slide fastener in the present invention is implemented with an appearance similar to that of conventional slide fasteners in terms of the appearance of the parts. Therefore, the names and functions of each part shown in Figures 1 and 2 are the same as the descriptions of the external shape already explained in the prior art, so a further explanation will be omitted. However, although the slide fastener 70 shown in Figure 1 is described as an example in which the elements 73, upper stopper 74, and lower stopper 75 are all molded by resin injection molding, it should be noted that a slide fastener 70 in which only one of the elements 73, upper stopper 74, or lower stopper 75 is molded by resin injection molding is also included in the scope of the embodiment of the present invention. Similarly, although Figure 2 illustrates an example in which the butterfly rod 93, box 94, and element 73 are all molded by resin injection molding, it should be noted that a slide fastener 70 in which only one of the butterfly rod 93, box 94, or element 73 is molded by resin injection molding is also included within the scope of the embodiments of the present invention.

[0026] (Resin injection-molded parts) The resin injection-molded parts according to this embodiment are manufactured from a synthetic resin containing polyethylene terephthalate as the main component. Here, "containing polyethylene terephthalate as the main component" means a resin containing 50% or more polyethylene terephthalate by weight percentage of the total synthetic resin, preferably 80% or more. The resin injection-molded parts according to this embodiment are resin injection-molded parts containing (A) resin, (B) nucleating agent, (C) antioxidant, (D) lubricant, and (E) pigment as the main components. The proportions of (A), (B), (C), (D), and (E) are 85% to 99%, 0.1% to 3.0%, 0.35% to 5.0%, 0.1% to 3.0%, and 0.1% to 10%, respectively. Note that (E) pigment is added for the purpose of coloring, so it may be omitted if coloring is not required. In particular, some of the test examples described below evaluate the physical properties of parts by using them as transparent resin parts without coloring. In addition to the main components (A), (B), (C), (D), and (E) mentioned above, other additives may be added to improve the functionality of the resin material. The main components (A), (B), (C), (D), and (E) mentioned above will be explained individually below.

[0027] ((A) Resin) The (A) resin according to this embodiment is mainly PET resin or recycled PET resin. PET is generally a resin obtained by using terephthalic acid or its ester-forming derivative (e.g., lower alkyl esters such as dimethyl ester and monomethyl ester) and ethylene glycol or its ester-forming derivative as raw materials, heating them in the presence of a catalyst, and then polymerizing the resulting glycol ester of terephthalic acid to a predetermined degree of polymerization in the presence of a catalyst. The recycled PET resin in this invention refers to PET that has been molded into products such as beverage bottles, fibers, films, or large molded products such as containers, and then recovered and processed for reuse. It is usually referred to as recycled PET material or recycled PET. The PET resin used in this invention is not limited to the product form of the recycled PET, but specifically, it can be a resin recycled from beverage bottles, fibers, films, molded products, etc. Furthermore, even if it is not actually used as a product, it may be PET resin such as film scraps, gates and runners of injection molded products that are generated during the manufacturing of products. While other resin materials may be added to PET resin to improve its functionality, the weight percentage of the other resin material will never exceed the weight percentage of the PET resin.

[0028] ((B) Crystallization nucleating agent) The (B) crystallization nucleating agent according to this embodiment is used for the purpose of improving the heat resistance by improving the degree of crystallinity of the (A) resin. As mentioned above, when PET resin is injected into a mold for conventional slide fastener injection molded parts, that is, a mold that has been used at room temperature for injection molding of polyacetal resin, the PET resin cools rapidly and does not crystallize sufficiently. If a part of a slide fastener product is used in such an insufficiently crystallized state, if it is subjected to heat exceeding the glass transition temperature of 70-80°C during use, the crystallization of the part will progress due to the heat, resulting in deformation of the part's shape. Conventionally, attempts have been made to increase the degree of crystallization of injection-molded parts immediately after manufacturing by raising the temperature of the mold to address this problem, but in this embodiment, the degree of crystallinity is increased by adding the (B) crystallization nucleating agent. This makes it possible to continue using existing molds for slide fastener injection molded parts. In other words, molds that are used and managed at room temperature (or, to put it another way, molds that are used and managed under temperature conditions below 30°C, or molds that are used and managed even under temperature conditions below 20°C) can be used continuously. Furthermore, it becomes possible to manufacture slide fasteners with the same level of manufacturing efficiency as before. (B) Examples of nucleating agents include organic nucleating agents and inorganic nucleating agents. These nucleating agents may be used individually or in combination of two or more.

[0029] Examples of organic nucleating agents include sodium benzoate, potassium benzoate, lithium benzoate, calcium benzoate, magnesium benzoate, barium benzoate, lithium terephthalate, sodium terephthalate, potassium terephthalate, sodium toluylate, sodium salicylate, potassium salicylate, zinc salicylate, aluminum dibenzoate, potassium dibenzoate, lithium dibenzoate, organic carboxylic acid metal salts such as sodium β-naphthalate and sodium cyclohexanecarboxylate, organic sulfonates such as sodium p-toluenesulfonate and sodium sulfisophthalate, sorbitol compounds, phenylphosphonate metal salts, and phosphorus compound metal salts such as sodium-2,2'-methylenebis(4,6-di-t-butylphenyl)phosphate. These may be used individually or in combination of two or more.

[0030] As inorganic nucleating agents, for example, talc, calcium carbonate, mica, boron nitride, synthetic silicic acid, silicates, silica, kaolin, carbon black, zinc oxide, montmorillonite, clay minerals, basic magnesium carbonate, quartz powder, glass fiber, glass powder, diatomaceous earth, dolomite powder, titanium dioxide, zinc oxide, antimony oxide, calcium sulfate, barium sulfate, alumina, calcium silicate, boron nitride, etc. can be used. These may be used individually or in combination of two or more.

[0031] (B) The content of the nucleating agent is usually 0.1 to 5 parts by weight, preferably 0.2 to 3 parts by weight, and more preferably 0.3 to 1.5 parts by weight, per 100 parts by weight of resin. If it is less than 0.1 parts by weight, crystallization will not be promoted, which is undesirable, and if it is more than 5 parts by weight, deterioration of the resin and a decrease in physical properties will occur, which is also undesirable.

[0032] (C) Antioxidant) It is standard practice to color slide fasteners. The resin injection-molded parts according to the present invention use PET resin as the base resin. Because PET resin is heated at high temperatures during processing, its molecular structure is prone to thermal decomposition. As a result, oxidation and by-products are formed, causing yellowing. This yellowing can be a contributing factor to the inability to obtain slide fasteners of the desired color. To further reduce this yellowing and thermal decomposition of the molecular structure, the resin injection-molded parts in this embodiment contain an antioxidant. (C) Antioxidant includes, for example, (C1) primary antioxidant and (C2) secondary antioxidant, and it is preferable to use (C1) primary antioxidant and (C2) secondary antioxidant in combination. The form of (C) antioxidant may be solid or liquid. (C1) Primary antioxidant includes, for example, phenolic antioxidants, hindered phenolic antioxidants, or aromatic amine antioxidants.

[0033] Examples of phenolic antioxidants include 2,4-dimethyl-6-t-butylphenol, 2,6-di-t-butylphenol, 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-ethylphenol, 4,4'-butylidenebis(6-t-butyl-3-methylphenol), 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), and octadecyl-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propyl Pionate, pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 1,1,3-tris(2-methyl-4-hydroxy-5-di-t-butylphenyl)butane, tris(3,5-di-t-butyl-4-hydroxybenzyl)isocyanurate, triethylene glycol-bis[3-(3-t-butyl-4-hydroxy-5-methylphenyl)propionate], 1,6-hexanediol bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] ], 2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5-di-t-butylanilino)-1,3,5-triazine, 2,2-thio-diethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], N,N'-hexamethylenebis(3,5-di-t-butyl-4-hydroxyhydrocinnamide), 3,5-di-t-butyl-4-hydroxybenzylphospho Examples include ionate-diethyl ester, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-t-butyl-4-hydroxybenzyl)-isocyanurate, 2,4-bis[(octylthio)methyl]-o-cresol, or isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate. These may be used individually or in combination of two or more.

[0034] Examples of hindered phenol antioxidants include N,N'-hexamethylene-bis-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide, bis(3,3-bis-(4'-hydroxy-3'-tert-butylphenyl)butanoic acid) glycol ester, 2,1'-thioethylbis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 4,4'-butylidene-bis(3-methyl-6-tert-butylphenol), and triethylene glycol-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate ("SONGNOX2450", molecular weight 633). These may be used individually or in combination of two or more.

[0035] Examples of aromatic amine antioxidants include N-phenyl-1-naphthylamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N,N-diethyl-p-phenylenediamine, N-phenyl-N'-ethyl-2-methyl-p-phenylenediamine, N-ethyl-N-hydroxyethyl-p-phenylenediamine, alkylated diphenylamine, N,N'-diphenyl-p-phenylenediamine, N,N'-diallyl-p-phenylenediamine, N-phenyl-1,3-dimethylbutyl-p-phenylenediamine, 4,4'-dioctyl-diphenylamine, 4,4'-dioctyl-diphenylamine, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, 2,2,4-trimethyl-1,2-dihydroquinoline, N-phenyl-β-naphthylamine, and N,N'-di-2-naphthyl-p-phenylenediamine. These may be used individually, or two or more may be used together.

[0036] (C2) Examples of secondary antioxidants include phosphorus-based antioxidants and sulfur-based antioxidants.

[0037] Examples of phosphorus-based antioxidants include triphenyl phosphite, triisodecyl phosphite, isodecyl diphenyl phosphite, 2-ethylhexyl diphenyl phosphite, 4,4'-isopropylidenediphenolalkyl (C12-C15) phosphite, tris(nonylphenyl) phosphite (Adekastab 1178), tris(2,4-di-t-butylphenyl) phosphite, 2,2'-methylenebis(4,6-di-t-butylphenyl)2-ethylhexyl phosphite, 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, and 3,9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane. These may be used individually, or two or more may be used together.

[0038] Examples of sulfur-based antioxidants include dilauryl 3,3'-thiodipropionate, tridecyl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, lauryl stearyl 3,3'-thiodipropionate, and neopentanetetrayltetrakis (3-laurylthiopropionate). These may be used individually or in combination of two or more.

[0039] (C1) The content of the primary antioxidant is usually 0.1 to 3 parts by weight, preferably 0.15 to 2 parts by weight, and more preferably 0.2 to 1 part by weight, per 100 parts by weight of resin. (C2) The content of the secondary antioxidant is usually 0.1 to 5 parts by weight, preferably 0.2 to 3 parts by weight, and more preferably 0.3 to 1 part by weight, per 100 parts by weight of resin. The combined content of the primary antioxidant (C1) and the secondary antioxidant (C2) is usually 0.2 to 8 parts by weight, preferably 0.35 to 5 parts by weight, and more preferably 0.5 to 2 parts by weight, per 100 parts by weight of resin.

[0040] (D) Lubricants Examples of lubricants include metal soap-based lubricants, higher fatty acid-based lubricants, ester-based lubricants, and higher alcohol-based lubricants. By using such lubricants, the viscosity of the composition containing (A) resin, (B) nucleating agent, and (C) antioxidant can be reduced, thereby improving moldability. It is also effective in controlling the adhesion state between the composition and metal surfaces such as screws, cylinders, and dies inside the extruder. Lubricants may be used individually or in combination of two or more types.

[0041] Examples of metal soap lubricants include metal soaps such as stearates, laurates, oleates, and palmitates of Na, Mg, Al, Ca, and Ba. Examples of higher fatty acid lubricants include saturated fatty acids such as stearic acid, palmitic acid, myristic acid, lauric acid, and capric acid, unsaturated fatty acids such as oleic acid, or mixtures thereof. Examples of ester lubricants include ester lubricants composed of alcohols and fatty acids, pentaerythritol lubricants such as monoesters, diesters, triesters, tetraesters, or mixtures thereof of pentaerythritol or dipentaerythritol and higher fatty acids, and montanic acid wax lubricants such as esters of montanic acid and higher alcohols such as stearyl alcohol, palmityl alcohol, myristyl alcohol, lauryl alcohol, and oleyl alcohol. Examples of higher alcohol lubricants include stearyl alcohol, palmityl alcohol, myristyl alcohol, lauryl alcohol, and oleyl alcohol.

[0042] (D) The lubricant content is usually 0.1 to 5 parts by weight, preferably 0.2 to 3 parts by weight, and more preferably 0.3 to 2 parts by weight, per 100 parts by weight of resin.

[0043] ((E) Pigment) The pigment may be appropriately selected according to the desired hue, and examples thereof include organic and inorganic pigments. Examples of the inorganic pigment include silicic acid, silicic anhydride, magnesium silicate, talc, sericite, mica, kaolin, red iron oxide, clay, bentonite, titanium-coated mica, bismuth oxychloride, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, iron oxide, ultramarine blue, chromium oxide, chromium hydroxide, calamine and complexes thereof. Examples of the organic pigment include polyamide, polyester, polypropylene, polystyrene, polyurethane, vinyl resin, urea resin, phenol resin, fluororesin, silicon resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene-styrene copolymer, silk powder, cellulose, CI Pigment Yellow, CI Pigment Orange, etc. It is also possible to use a composite pigment of an inorganic pigment and an organic pigment.

[0044] The content of the (E) pigment is usually 0.01 to 15 parts by weight, preferably 0.1 to 10 parts by weight, more preferably 0.5 to 7 parts by weight, relative to 100 parts by weight of the resin.

[0045] (Method for Manufacturing Resin Injection Parts) The method for manufacturing the slide fastener in this embodiment involves heating and melting the resin pellets that will be used as the material, injecting the molten resin into a mold, and integrally molding it onto a fastener tape that has been placed in the mold beforehand. This method for manufacturing slide fasteners is the same as the conventional method for manufacturing resin injection slide fasteners, and the method itself is already known from various prior art documents (for example, one example is International Publication No. 2013 / 088561). Therefore, a detailed explanation of the method for manufacturing slide fasteners itself will be omitted. However, a feature of the manufacturing method in this embodiment is that when the resin pellets that will be used as the material are heated and melted, the main components described above—(A) resin, (B) nucleating agent, (C) antioxidant, (D) lubricant, and (E) pigment—are mixed in. It is preferable that these components be mixed into the resin pellets that will be used as the material beforehand. Therefore, it is preferable to pre-mix the main components, (A) resin, (B) nucleating agent, (C) antioxidant, (D) lubricant, and (E) pigment, during the resin pellet manufacturing stage to produce resin pellets in advance. Other manufacturing methods according to this embodiment include (i) a method using a masterbatch containing (E) pigment and a compound consisting of (A) resin, (B) nucleating agent, (C) antioxidant, and (D) lubricant, or (ii) a method using a masterbatch containing (E) pigment and (B) nucleating agent and a compound consisting of (A) resin, (C) antioxidant, and (D) lubricant.

[0046] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these.

[0047] (Method for measuring crystallinity) Crystallinity is measured based on the method described in JIS K7122:2012 "Method for Measuring Transition Temperature of Plastics". As a differential scanning calorimeter, DSC200 manufactured by Hitachi High-Tech Science Corporation is used. A measurement sample container is filled with approximately 5 mg of the measurement sample, and a DSC curve is obtained when the temperature is increased from 20°C to 300°C at a rate of 10°C / min. Crystallinity is obtained by dividing the difference between the heat of fusion (J / g) determined from the area of the melting peak and the heat of crystallization (J / g) determined from the area of the crystallization peak by the theoretical heat of fusion of a perfect crystal of polyethylene terephthalate ("140.0 J / g" in the case of polyethylene terephthalate). The heat of fusion and the heat of crystallization are calculated using analysis software attached to the apparatus. From the above, the crystallinity can be obtained from the following formula. Crystallinity (%) = ((Heat of fusion (J / g) - Heat of crystallization (J / g)) / 140 (J / g)) × 100

[0048] (Method for measuring calcium) -Preparation method of test solution- Accurately weigh 0.05 g of a sample, add 2 mL of sulfuric acid, and let stand for about 20 minutes. Add 2 mL of nitric acid and 1 mL of ultrapure water, and let stand for about 10 minutes. Thereafter, the sample is decomposed with microwaves, the solution adjusted to a constant volume of 25 mL is appropriately diluted, and the calcium content is measured using inductively coupled plasma optical emission spectrometry ICP-OES (ICP-OES, manufactured by Thermo Fisher Scientific).

[0049] (Method for measuring phosphorus) -Preparation method of test solution- Accurately weigh 0.05 g of a sample, add 2 mL of sulfuric acid, and let stand for about 20 minutes. Add 2 mL of nitric acid and 1 mL of ultrapure water, and let stand for about 10 minutes. Thereafter, the sample is decomposed with microwaves, the solution adjusted to a constant volume of 25 mL is appropriately diluted, and the calcium content is measured using inductively coupled plasma optical emission spectrometry ICP-OES (ICP-OES, manufactured by Thermo Fisher Scientific).

[0050] (Example 1) To PET resin (SD-R: Zhejiang Jianxin Jiaren New Materials Co., Ltd.), 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of PET resin, 0.2 parts by weight of an antioxidant (AO-80: ADEKA Corporation) was added per PET resin, 0.3 parts by weight of an antioxidant (PEP-36: ADEKA Corporation) was added per PET resin, and 0.3 parts by weight of a lubricant (LicocareRBW360: Clariant Japan Co., Ltd.) was added per PET resin. Furthermore, 1 part by weight of a pigment (MONARCH800 Carbon Black: Cabot Corporation) was added per PET resin. Next, the butterfly bar 93 and box 94, which are the opening parts of a slide fastener, were injection molded onto the fastener tape. Then, according to the method for measuring the degree of crystallinity, the degree of crystallinity of the box 94 manufactured by injection molding and before the high-temperature washing test was measured. The measurement results are shown in Table 1.

[0051] (Example 2) To PET resin (KP-123: Pet Refine Technology Co., Ltd.), 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of PET resin, 0.2 parts by weight of an antioxidant (AO-80: ADEKA Corporation) was added per PET resin, 0.3 parts by weight of an antioxidant (PEP-36: ADEKA Corporation) was added per PET resin, and 0.5 parts by weight of a lubricant (LicocareRBW360: Clariant Japan Co., Ltd.) was added per PET resin. Furthermore, 2 parts by weight of a pigment (MONARCH800 Carbon Black: Cabot Corporation) was added per PET resin. Next, the degree of crystallinity was measured in the same manner as in Example 1. The measurement results are shown in Table 1.

[0052] (Comparative Example 1) Using PET resin (KP-123: Pet Refine Technology Co., Ltd.), a butterfly rod 93 and a box 94 were prepared in the same manner as in Example 1, and the degree of crystallinity was measured. The measurement results are shown in Table 1. No pigments were added for coloring, and the material is transparent.

[0053] (Comparative Example 2) To PET resin (SD-R: Zhejiang Jianxin Jiaren New Materials Co., Ltd.), 0.5 parts by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) per 100 parts by weight of PET resin, 0.2 parts by weight of an antioxidant (AO-80: ADEKA Corporation) per PET resin, 0.3 parts by weight of an antioxidant (PEP-36: ADEKA Corporation) per PET resin, and 0.3 parts by weight of a lubricant (LicocareRBW360: Clariant Japan Co., Ltd.) per PET resin were added. Then, the degree of crystallinity was measured in the same manner as in Example 1. The measurement results are shown in Table 1.

[0054]

[0055] (Heat Deformability Evaluation) For Examples 1 and 2 and Comparative Examples 1 and 2, washing and drying were performed under the following series of processing conditions. In addition, the heat deformability of the butterfly rod 93 and box 94 after washing and after drying was confirmed. The results are shown in Table 2. Note that the following conditions are based on high-temperature washing in Europe.

[0056] - Processing conditions - 1. Wash at 90°C for 15 minutes 2. Rinse for 3 minutes 3. Spin dry for 1 minute 4. Dry at 120°C for 10 minutes

[0057] - Confirmation of Heat Deformability - For Examples 1 and 2 and Comparative Examples 1 and 2, the insertion feel of the butterfly rod 93 into the box 94 after washing and drying was confirmed. In Comparative Example 1, after washing at 90°C, the upper part of the tape groove 91a of the box 94 deformed and narrowed, as shown in Figure 3. Furthermore, after drying at 120°C, the upper part of the tape groove 91a of the box 94 deformed even further, as shown in Figure 4, to the point where there was almost no gap, and the entire resin became cloudy. When the tape groove 91a deforms to the point of narrowing as shown in Figures 3 and 4, it becomes impossible to insert the tape into the tape groove 91a, and the opening and closing operation of the slide fastener becomes impossible. On the other hand, although there was some deformation in Examples 1 and 2, it did not become impossible to insert the tape into the tape groove 91a, and the opening and closing function of the slide fastener was maintained. From the results of the crystallinity measurement and the confirmation of heat deformability, it became clear that if the crystallinity is 12% or higher, the opening and closing operation of the slide fastener can be performed even after washing and drying.

[0058] As described in the embodiments and examples above, using slide fastener components with high crystallinity immediately after manufacturing (before high-temperature washing and drying) using a crystal nucleating agent is a very important technique for utilizing PET material. However, while the inventors were testing numerous combinations of additives as described in the embodiments above, they discovered that in the case of certain additive combinations, injection-molded components would turn gray. This discoloration prevents the components from being colored to the intended color for the slide fastener product. While this does not have much impact when the slide fastener is black, it results in defective products when it is white or light-colored, and even with other color systems, the overall color of the slide fastener is not unified, resulting in defective products. Therefore, the inventors investigated the cause and conducted further tests and verifications to prevent such defects. The details of these tests and verifications will be explained later, but the conclusion was that the graying is caused by the coexistence of PET resin in which antimony is used as a polymerization catalyst during the manufacturing of the PET resin material, a phosphorus-based antioxidant, and a crystal nucleating agent. It is presumed that graying occurs due to the action of antimony and phosphorus-based antioxidants, and that the nucleating agent promotes the graying. The phosphorus content in the resin composition derived from the phosphorus-based antioxidant can be calculated from the content of the (C2) secondary antioxidant and the proportion of phosphorus in the phosphorus-based antioxidant mentioned above. Specifically, the phosphorus content in the resin composition is presumed to be in the range of 50 to 5000 ppm. For example, when using a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) as the (C2) secondary antioxidant, its content is generally in the range of 0.1 to 5 parts by weight per 100 parts by weight of resin. In this case, the phosphorus content in the resin composition would be approximately 93 ppm to 4650 ppm. Furthermore, when the phosphorus-based antioxidant (PEP-36: ADEKA Corporation) is used in an amount typically ranging from 0.3 to 1 part by weight per 100 parts by weight of resin, the phosphorus content in the resin composition will be approximately 280 ppm to 933 ppm.

[0059] Based on the above inferences, one possible solution is to manufacture slide fasteners while avoiding the specific additive combinations mentioned above. However, this solution would limit the freedom of material selection during the manufacture of slide fasteners. Therefore, it is more desirable to be able to suppress graying of PET resin injection-molded parts regardless of the antioxidant combination. In this regard, the inventors succeeded in obtaining knowledge that can be used as a countermeasure through numerous tests and verifications. Specifically, they found that adding a lubricant containing calcium suppresses the aforementioned graying problem. With this knowledge, the objective of using PET resin for resin injection-molded parts of slide fasteners can be achieved more generally. The following describes the tests and verifications that led to the discovery of the cause of graying and its countermeasures.

[0060] The causes of graying after injection molding of PET resin are explained in Reference Examples 1 to 5. (Reference Example 1) In a PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst, 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of the PET resin, 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) was added per PET resin, and 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) was added per PET resin. Next, the fastener tape was injection molded as a hinge 93 and a box 94, which are the opening parts of a slide fastener. Photographs of the resulting hinge 93 and box 94 are shown in Figure 5.

[0061] (Reference Example 2) In a PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst, 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) and 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) were added to the PET resin (100 parts by weight). Next, the butterfly bar 93 and box 94, which are the opening parts of a slide fastener, were injection molded onto the fastener tape. Photographs of the resulting butterfly bar 93 and box 94 are shown in Figure 6.

[0062] (Reference Example 3) Antimony was used as a polymerization catalyst in PET resin (KP-123: Pet Refine Technology Co., Ltd.). One part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) and 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) were added to the PET resin (100 parts by weight). These were then injection molded onto a fastener tape as a hinge 93 and a box 94, which are the opening mechanisms of a slide fastener. Photographs of the resulting hinge 93 and box 94 are shown in Figure 7.

[0063] (Reference Example 4) Antimony was used as a polymerization catalyst in PET resin (KP-123: Pet Refine Technology Co., Ltd.). 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) and 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) were added to the PET resin (100 parts by weight). These were then injection-molded into a fastener tape as a hinge 93 and a box 94, which are the opening mechanisms of a slide fastener. Figure 8 shows photographs of the resulting hinge 93 and box 94.

[0064] (Reference Example 5) In a PET resin (TRN-8550FF: Teijin Limited) in which titanium was used as a polymerization catalyst (antimony was not used as a polymerization catalyst), 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of the PET resin, 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) was added per PET resin, and 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) was added per PET resin. Next, the butterfly bar 93 and box 94, which are the opening parts of a slide fastener, were injection molded onto the fastener tape. Photographs of the resulting butterfly bar 93 and box 94 are shown in Figure 9.

[0065] In Reference Examples 1 to 5, no pigment was added to make the graying more visible. Therefore, the injected butterfly rod 93 and box 94 are injected in a transparent state unless there is a particular abnormality. In addition, white fastener tape was used. Furthermore, no lubricant was added in Reference Examples 1 to 5.

[0066] As can be seen from Figures 5 to 9, the hinge rods 93 and boxes 94 in Reference Examples 3, 4, and 5 are transparent and the resin has not turned gray. On the other hand, the tip and edges of the hinge rod 93 in Reference Example 1, and the entire box body and the edges of the box rod of box 94 are discolored black. In Reference Example 2, although it is not as grayed as in Reference Example 1, as is clear when compared with Reference Examples 3 to 5, the tip and edges of the hinge rod 93, and the entire box body and the edges of the box rod of box 94 are slightly discolored black.

[0067] In the case of Reference Example 2, the resin was injected in a colorless and transparent state immediately after the start of injection molding. However, after repeating the injection of the butterfly rod 93 and box 94 about five times, it gradually became darker. This is presumed to be because the synthetic resin stored in the injection cylinder of the injection molding machine was heated over time, causing it to turn gray. This trend was also observed in Reference Example 1 shown in Figure 5, and the longer the residence time in the injection cylinder, the darker the gray color tends to become. The photograph of Reference Example 2 in Figure 6 shows the state after the eighth injection molding. On the other hand, in Reference Examples 3 to 5, no signs of graying were observed even after repeated injection molding. In particular, since Reference Example 3 differs from Reference Example 1 only in that a phosphorus-based antioxidant was not added, it can be understood that the presence or absence of a phosphorus-based antioxidant affects the occurrence of graying. Furthermore, since Reference Example 4 differs from Reference Example 1 only in that it does not contain a nucleating agent, it can be understood that the presence or absence of a nucleating agent affects the occurrence of graying. Also, since Reference Example 5 differs from Reference Example 1 in that the PET resin used does not use antimony as a polymerization catalyst, it can be understood that the use of antimony as a polymerization catalyst affects the occurrence of graying.

[0068] From the results of the above reference examples 1 to 5, it was found that the graying is caused by the coexistence of PET resin in which antimony was used as a polymerization catalyst during the manufacturing of the PET resin material, a phosphorus-based antioxidant, and a crystal nucleating agent.

[0069] As described above, a certain conclusion was reached regarding the cause of graying, leading to the conclusion that one solution would be to avoid the combination of specific resins and additives (PET resin using antimony as a polymerization catalyst, a phosphorus-based antioxidant, and a crystal nucleating agent) when manufacturing slide fasteners. However, through numerous tests and verifications, it was possible to find countermeasures that could suppress graying even when such specific resin and additive combinations were used. Specifically, it was found that adding a calcium-containing additive (for example, a calcium salt-based lubricant) suppressed the graying problem described above.

[0070] The following will be explained using Example 3 and Comparative Example 3. Example 3 is obtained by adding a calcium-containing lubricant to the aforementioned Reference Example 1. On the other hand, Comparative Example 3 is obtained by adding a calcium-free lubricant to Reference Example 1.

[0071] (Example 3) In a PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst, 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of the PET resin, 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) was added per PET resin, 0.3 parts by weight of a phosphorus antioxidant (PEP-36: ADEKA Corporation) was added per PET resin, and 0.5 parts by weight of a calcium-containing lubricant (Licocare RBW360: Clariant) was added per PET resin. Next, the butterfly bar 93 and box 94, which are the opening parts of a slide fastener, were injection molded onto the fastener tape. Photographs of the resulting butterfly bar 93 and box 94 are shown on the left side of Figure 10. In addition, to make it easier to see the changes before and after the lubricant is added, photographs related to Reference Example 1 are shown side by side on the right side of Figure 10.

[0072] Next, the calcium content of box 94 was measured according to the calcium measurement method. The calcium measurement result was 180 ppm.

[0073] (Comparative Example 3) In a PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst, 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.), 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation), 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation), and 0.5 parts by weight of a calcium-free lubricant (LicomontNAV101: Clariant Co., Ltd.) were added to the PET resin. Next, the butterfly bar 93 and box 94, which are the opening mechanisms of a slide fastener, were injection molded onto the fastener tape. Photographs of the resulting butterfly bar 93 and box 94 are shown on the left side of Figure 11. In addition, in the same figure, a photograph of Reference Example 1 is shown on the right side of Figure 11 to make it easier to see the changes before and after the addition of the lubricant.

[0074] Similar to Reference Examples 1 to 5, no pigment was added to make the graying more visible. Therefore, the injected butterfly rod 93 and box 94 are transparent unless there is a particular abnormality. Also, white fastener tape was used.

[0075] As shown in Figure 10, the butterfly rod 93 and box 94 containing a calcium-containing lubricant do not show graying and are molded in a transparent state. Also, as shown in Figure 11, when a calcium-free lubricant (sodium-based lubricant) is used, graying still occurs in the butterfly rod 93 and box 94, but it is a slightly lighter gray than when no lubricant is used (reference example 1 on the right side of Figure 11).

[0076] Next, in order to further investigate the graying effect when the amount of calcium-containing lubricant (Licocare RBW360: Clariant) added was varied, the following tests were conducted: Examples 4 and 5, and Reference Examples 6, 7, and 8.

[0077] (Example 4) In this Example 4, PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst was mixed with 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) per 100 parts by weight of PET resin, 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) per PET resin, 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) per PET resin, and 0.2 parts by weight of a calcium-containing lubricant (Licocare RBW360: Clariant Co., Ltd.) per PET resin. Next, resin injection molding was performed to create a resin composition. The calcium content of the obtained resin composition was measured according to the calcium measurement method. The calcium measurement result was 78 ppm. When the resin composition of this Example 4 was visually inspected, no graying occurred. The molecular formula of PEP-36 (ADEKA Stab), manufactured by ADEKA Corporation and used as a phosphorus-based antioxidant, is C35H54O6P2, and its molecular weight is 633. Therefore, the phosphorus concentration in the above resin composition is approximately 280 ppm.

[0078] (Example 5) A resin composition was prepared in the same manner as in Example 4, except that 0.1 parts by weight of a calcium-containing lubricant (Licocare RBW360: Clariant) was added to the PET resin. The calcium content of the obtained resin composition was measured according to the calcium measurement method. The calcium measurement result was 39 ppm. When the resin composition of Example 5 was visually inspected, no graying occurred.

[0079] (Reference Example 6) A resin composition was prepared in the same manner as in Example 4, except that 0.05 parts by weight of a calcium-containing lubricant (Licocare RBW360: Clariant) was added to PET resin (100 parts by weight). The calcium content of the obtained resin composition was measured according to the calcium measurement method. The calcium measurement result was 19.5 ppm. When the resin composition of Reference Example 6 was visually inspected, a slight graying was observed, although it was a light gray color.

[0080] (Reference Example 7) A resin composition was prepared in the same manner as in Example 4, except that 0.01 parts by weight of a calcium-containing lubricant (Licocare RBW360: Clariant) was added to PET resin (100 parts by weight). The calcium content of the obtained resin composition was measured according to the calcium measurement method. The calcium measurement result was 3.9 ppm. When the resin composition of Reference Example 7 was visually inspected, a slightly darker gray color had occurred compared to Reference Example 6.

[0081] (Reference Example 8) In a PET resin (KP-123: Pet Refine Technology Co., Ltd.) using antimony as a polymerization catalyst, 1 part by weight of a crystal nucleating agent (Hymiran 1707: Mitsui Dow Polychemical Co., Ltd.) was added per 100 parts by weight of the PET resin, 0.2 parts by weight of a phenolic antioxidant (AO-80: ADEKA Corporation) was added per PET resin, and 0.3 parts by weight of a phosphorus-based antioxidant (PEP-36: ADEKA Corporation) was added per PET resin. (No calcium-containing lubricant was added.) Next, resin injection molding was performed to create a resin composition. When the resin composition of Reference Example 8 was visually inspected, it was found to be even darker in color than Reference Example 7, with a gray coloration closer to black occurring.

[0082] From the test results of Examples 4 and 5, and Reference Examples 6, 7, and 8 described above, it was confirmed that even with the aforementioned combination of specific resins and specific additives, the occurrence of graying cannot be suppressed unless the calcium content is at least 20 ppm, and that if it is 20 ppm or more, the degree of graying will remain light gray. It was also confirmed that the calcium content is more preferably 39 ppm or more, and even more preferably 78 ppm or more.

[0083] From the results of all the tests and verifications described above, it can be understood that the graying phenomenon of injection-molded resin, which occurs when antimony is used as a polymerization catalyst during the manufacturing of the PET resin material, and when phosphorus-based antioxidants and nucleating agents coexist, can be suppressed by adding a calcium-containing additive. Note that the calcium-containing additive does not necessarily have to be a lubricant; other additives may also be used. A mixture of a calcium-free lubricant and another calcium-containing additive may also be used. However, since lubricants have various effects in injection molding in addition to suppressing the graying mentioned above, it is preferable to select a calcium-containing lubricant.

[0084] When manufacturing clothing using the slide fasteners of the present invention, the clothing can be sold as an environmentally friendly product that reuses recycled PET resin, and can also be labeled with features that will attract consumer interest, such as being washable at temperatures of 90°C or higher. This is beneficial for both sellers and buyers.

[0085] It should be noted that the present invention is not limited to the embodiments described above, and it is also possible to appropriately utilize, use as a substitute for, or add to technologies that are substantially the same as or have similar effects as those described in the embodiments of the present invention, as recognized by those skilled in the art.

[0086] 70 Slide fastener 71, 72 Fastener tape 73 Element 74 Upper stopper 75 Lower stopper 76 Slider 77 Pull tab 91, 92 Fastener tape 91a Tape groove 93 Butterfly pin 93a Butterfly pin hole 94 Box 95 Box body 95a Box body flange 96 Box bar

Claims

1. A slide fastener having elements attached to the edge of a fastener tape, wherein the slide fastener has a resin injection molded part formed by injection molding a synthetic resin mainly composed of polyethylene terephthalate onto the fastener tape, the synthetic resin of the resin injection molded part contains a crystal nucleating agent, and the crystallinity of the resin injection molded part is 12% or more.

2. The slide fastener according to claim 1, characterized in that the resin injection-molded component is one of the fastener element, bottom stopper, top stopper, butterfly pin, or box, or a combination of several of these.

3. The slide fastener according to claim 2, characterized in that the resin injection-molded component is a hinge or a box, and a resin film is provided on the fastener tape adjacent to the hinge or box.

4. The slide fastener according to claim 1 or 2, characterized in that the resin injection-molded part is a part manufactured by injection into a mold at a temperature of less than 30°C.

5. The slide fastener according to claim 1 or 2, characterized in that the resin injection-molded part is a part manufactured from a synthetic resin that does not consist of a polyethylene terephthalate resin in which antimony is used as a polymerization catalyst, a phosphorus-based antioxidant, and a crystal nucleating agent.

6. A slide fastener having elements attached to the edge of a fastener tape, wherein the slide fastener has a resin injection molded part formed by injection molding a synthetic resin mainly composed of polyethylene terephthalate onto the fastener tape, and the synthetic resin contains 50 ppm or more of phosphorus and 20 ppm or more of calcium when the total weight of the synthetic resin of the resin injection molded part is 100%.

7. The slide fastener according to claim 6, characterized in that a lubricant containing calcium as an ingredient is included in the synthetic resin.

8. The slide fastener according to claim 1 or 6, characterized in that the polyethylene terephthalate of the synthetic resin contains recycled polyethylene terephthalate.

9. Clothing that, by using the slide fastener described in claim 1 or claim 6, is capable of being washed at a high temperature of 90°C or higher.

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