JPH0586528U - Handbag - Google Patents

Abstract

(57) [Summary] [Structure] Ethylene-propylene-diene copolymer (a) 30-70% by weight, vinyl acetate content 5-30% by weight, ethylene-vinyl acetate copolymer having a melt index of 0.2-25 g / 10 min. A biaxially stretched elastomer film (2) obtained by forming a thermoplastic elastomer composition containing a polymer (b) in an amount of 70 to 30% by weight by an air-cooling inflation method, and a moisture-permeable fiber substrate ( 3)
A glove (1) made of a laminated sheet having a large number of fine holes in an elastomer film formed by heating and pressing. [Effect] Hygienic gloves with excellent breathability, waterproofness, slip resistance, stretchability, dust resistance, and touch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hygienic handbag having breathability, waterproofness, slip resistance, stretchability and dust resistance. More specifically, the present invention relates to a highly productive glove suitable for work in a clean room where precision instrument parts are manufactured, and for medical personnel who need to maintain a strict hygienic environment.

[0002]

[Prior art and its problems]

 Conventionally, a simple glove using a nonwoven fabric which is a breathable material has been known. Although gloves made of non-woven fabric are breathable, they lack waterproofness, anti-slip properties, and stretchability. They do not fit your hands when worn, and they tend to slip when you carry them. Since the fibers that make up the woven fabric are scattered, there is a problem that it cannot be used as it is as work gloves in clean rooms in IC factories and biotechnology-related factories. Therefore, treatment with a soft vinyl chloride resin or an acrylic resin is performed in order to impart dustproofness and slip resistance, but there is a drawback in that the touch feel becomes poor. In addition, gloves with excellent productivity made of rubber and plastic materials such as soft vinyl chloride resin have problems with breathability and detachability, and are not suitable for long-time work in a clean room. Therefore, an object of the present invention is to provide a glove that solves the above problems, that is, a glove excellent in breathability, waterproofness, slip resistance, stretchability, dust resistance and tactile sensation.

[0003]

[Means for Solving the Problems]

 The inventors of the present invention have developed a thermoplastic elastomer composition obtained by blending a specific amount of an ethylene-propylene-diene copolymer and a specific ethylene-vinyl acetate copolymer in a biaxial direction (MD) by an air cooling inflation method. Direction and TD direction), a laminated sheet obtained by thermocompression bonding an elastomer film obtained by stretching and film formation with a moisture-permeable fiber substrate such as a nonwoven fabric has many fine pores in the elastomer film, We have confirmed that the above problems can be solved by forming gloves so that they are waterproof, slip-proof, stretchable and dust-proof, and the elastomer film surface of this laminated sheet is the outer surface, and completed the present invention. did.

That is, the present invention relates to 1) ethylene-propylene-diene copolymer (a) 30 to 70% by weight, vinyl acetate content 5 to 30% by weight, and melt index 0.2 to 25 g / 10 min of ethylene- A biaxially stretched elastomer film (A) obtained by forming a thermoplastic elastomer composition containing 70 to 30% by weight of a vinyl acetate copolymer (b) by an air-cooled inflation method, and moisture permeability A laminated sheet obtained by thermocompression bonding a fiber base material (B), comprising a sheet having a large number of fine holes in an elastomer film, 2) a sheet (B) comprising two layers of (A) and (B) ) The glove according to 1 above, which has the surface as a wearing side, and 3) the glove according to 1 above, which comprises a sheet having a three-layer structure in which both surfaces of (B) are sandwiched by (A).

[0005]

[Device configuration]

Hereinafter, the present invention will be described in detail. In the raw material composition of the elastomer film (A) constituting the glove of the present invention, the ethylene-propylene-diene copolymer (EPDM) as the component (a) is a copolymer containing ethylene, propylene and a diene compound. . Examples of the diene compound include ethylidene norbornene, 1,4-hexadiene, dicyclopentadiene and the like. The EPDM preferably has an ethylene content of 60 to 70 mol%, a propylene content of 30 to 40 mol%, and a diene compound content of 1 to 10 mol%. A more preferable range is 62 to 66 mol% of ethylene, 33 to 37 mol% of propylene, and 3 to 6 mol% of diene compound. The number average molecular weight of EPDM is preferably 400,000 to 600,000, and the density is preferably 0.87 g / cm ^{3 or} less. Further, the melt index of EPDM (190 ° C., 2.16 kg load) is preferably in the range of 0.1 to 5.0 g / 10 minutes, more preferably 0.3 to 1.0 g / 10 minutes.

The ethylene-vinyl acetate copolymer (EVA) as the component (b), which is the other raw material of the elastomer film (A), has a vinyl acetate content of 5 to 30% by weight, and is a melt. It is a copolymer having an index (190 ° C, 2.16 kg load) of 0.2 to 25 g / 10 min. If the content of vinyl acetate is less than 5% by weight, the rubber elasticity is poor, while if it exceeds 30% by weight, the film is blocked and film formation becomes difficult. The preferred vinyl acetate content is 15 to 30% by weight. Regarding the melt index, if it is less than 0.2 g / 10 min, the film forming processability is poor, and if it exceeds 25 g / 10 min, film formation by the air-cooled inflation method becomes difficult. The preferred melt index is 15-25 g / 10 minutes.

The blending ratio of EPDM in the raw material thermoplastic composition of the elastomer film (A) is 30 to 70% by weight based on the resin component (100% by weight), and particularly preferably 50 to 60% by weight. .. When the blending ratio of the EPDM is lower than 30% by weight, the stretch ratio of the obtained elastomer film is lowered, and when it is formed into a composite film, the microporosification due to heat shrinkage becomes insufficient. On the other hand, if the blending ratio of EPDM is higher than 70% by weight, the moldability of the obtained elastomer film is deteriorated. On the other hand, the blending ratio of EVA is 70 to 30% by weight based on the resin component (100% by weight), and particularly preferably 50 to 40% by weight. The reason for limiting the blending ratio of EVA is exactly opposite to the reason for limiting the EPDM. When it is lower than 30% by weight, moldability is lowered, and when it is higher than 70% by weight, the stretch ratio of the elastomer film is lowered.

The thermoplastic elastomer composition used in the present invention may contain other components in addition to the essential components, EPDM and EVA, in order to improve the properties as a glove depending on the application. .. Other components include polyolefins that improve the blocking resistance and moldability of the elastomer film, powder-like inorganics that improve blocking resistance and heat resistance, and facilitate microporosification when used as a composite film. Examples include fillers, heat stabilizers, ultraviolet absorbers, antistatic agents, antioxidants, pigments and coloring agents.

Here, as the above-mentioned polyolefins, ethylene and homopolymers of α-olefins such as propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1 and ethylene, Examples thereof include a copolymer with propylene or another α-olefin, or a copolymer of two or more kinds of these α-olefins. Among these, polyethylene such as low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene is preferable. The polyethylene preferably has a density of 0.945 g / cm ³ or less, and a melt index of 0.1 to 10 g / 10 min. The amount of the above polyolefins added is preferably 1 to 30 parts by weight, and particularly preferably 5 to 20 parts by weight, based on the weight of EP DM + EVA (100 parts by weight). The amount of polyolefin added is preferably set so that the melt index of the composition to which the polyolefin is added is 0.5 to 20 g / 10 minutes. If the amount of the polyolefin added is less than 1 part by weight, there is no effect in improving the blocking resistance and moldability, and if it exceeds 30 parts by weight, the rubber elasticity of the obtained composition decreases.

Further, as the powdery inorganic filler, talc, calcium carbonate, gypsum, carbon black, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, phosphoric acid Calcium, aluminum hydroxide, zinc oxide, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, alumina, mica, shirasu balloon, zeolite, silicate clay, cement, silica fume, etc. can be used. , Titanium oxide, calcium carbonate, silica and the like are particularly preferable. The average particle size of the inorganic filler is 5 μm or less, preferably 1 to 3 μm. These powdery inorganic fillers can be used alone or in combination. The addition amount of the above powdery inorganic filler is preferably 2 to 15 parts by weight based on the weight of EPDM + EVA (100 parts by weight). If it is less than 2 parts by weight, the effect of adding the powdery inorganic filler may not be remarkable, and if it exceeds 15 parts by weight, the strength of the obtained composition may be rather deteriorated. However, when the above-mentioned inorganic filler is added, the film-forming property and the stretch processability of the obtained composition deteriorate, so the amount of the inorganic filler is appropriately selected within the above range depending on the use of the elastomer film.

The elastomer film (A) constituting the glove of the present invention is preferably melt-kneaded at a temperature of 150 to 175 ° C., for example, with the above EPDM, EVA, and other optional components, and then preferably mixed. It can be obtained by forming a film on a biaxially stretched film by an air-cooled inflation molding method developed by the applicant (Japanese Patent Publication No. 3-49930). In film formation by the air-cooled inflation molding method, the thermoplastic film is stretched from the neck portion of the elastomer film bubble to the frost line so that it can be sufficiently stretched not only in the longitudinal direction (MD direction) but also in the transverse direction (TD direction) of the inflation device. Biaxial stretching is performed by providing a cooling means capable of adjusting the melt tension of the elastomer composition to an optimum level and lengthening the neck part to lower the temperature in the stretching region so that sufficient stretching in the TD direction can be achieved. An elastomer film can be obtained. That is, the temperature of the elastomer composition extruded from the annular die, the take-up of the bubbles in the elastomer film, the setting of the relationship between the length of the bubble neck and the annular die and the aperture ratio, and the use of multiple cooling rings. By adjusting the setting of the cooling temperature at each position of the valve, it is possible to manufacture a uniform and thin film that is biaxially stretched in the expansion portion between the neck portion and the frost line of the valve.

The thickness of the elastomer film (A) used in the present invention is preferably 10 to 150 μm. When the thickness is less than 10 μm, the film strength is reduced, and when the thickness is more than 150 μm, the workability of the glove is reduced, the cost is increased, the glove becomes hard and the touch is deteriorated, and the moisture-permeable fiber base material (B) described later is heated. When pressure-bonded, the fine porosity is incomplete and the air permeability decreases. The more preferable thickness of the film is 10 to 40 μm. Specifically, the film is formed by the air-cooled inflation molding method at a resin temperature of 120 to 165 ° C. so that the blow ratio (diameter of bubble / diameter of die slit) is in the range of 2.0 to 5.0. It is possible to obtain a biaxially stretched elastomer film having a size of -40 μm.

In the present invention, various materials such as non-woven fabrics and woven fabrics made of various fiber base materials can be used as the moisture-permeable fiber base material (B). As the woven cloth, in addition to natural fibers such as cotton gauze, plain woven cloth of synthetic fibers such as polyester and nylon is used, and as the non-woven cloth, synthetic fiber materials such as polyolefin, polyamide and polyurethane are used, and spun lace method and Various materials such as non-woven fabric manufactured by the melt blow method can be used. The non-woven fabric does not have to be made of long fibers, but may be made of short fibers that are engaged or spot-welded. It is necessary that the fibrous base material does not substantially melt or heat-shrink in the interlaminar pressure bonding step by heating with the elastomer film. Therefore, it is generally necessary that the melting point or the second-order transition point of the fiber base material is higher than the elastomer film (A) by at least 20 ° C. or more. The moisture permeable fiber base material (B) may have a normal thickness. That is, 50 to 200 μm is preferable. When the thickness is less than 50 μm, the strength is reduced, and when the thickness is more than 200 μm, the feel is poor.

In the present invention, the biaxially stretched elastomer film (A) and the moisture-permeable fiber base material (B) are heat-pressed to process a laminated sheet into a glove, and the elastomer film (A) is a nonwoven fabric. When heat-pressed to a moisture permeable fiber substrate (B) such as, the elastomer film causes minute cracks at the crossing points of the fibers of the moisture permeable fiber substrate, and the elastomer film causes heat shrinkage to expand the cracks. In addition, a large number of fine holes are formed, and stretchability and high slip resistance are imparted. Further, in addition to the air permeability of the moisture permeable fiber base material (B), the waterproof property of the elastomer film can be imparted. Compared with conventional anti-slip layers made of acrylic resins, this elastomer film can provide excellent anti-slip properties even with a thin film thickness, which improves workability when manufacturing gloves and reduces costs. It can be reduced. In addition, there is a problem of wearability and operability in gloves using conventional non-woven fabrics, the problem that fibers constituting non-woven fabrics are scattered as dust, or when treated with soft vinyl chloride resin to impart anti-slip properties. Can solve the problem that the feeling of touch becomes poor. Further, the moisture permeable fiber base material is strongly reinforced by the elastomer film integrally fixed to the moisture permeable fiber base material, and has a large mechanical strength. Furthermore, since no adhesive is used when integrating the elastomer film and the breathable fiber base material, even if it is worn as a glove, there is little effect on the human body such as a rash, and it is easy and hygienic especially for medical use and clean rooms. It is extremely useful as a basic glove base material.

In the present invention, various methods can be adopted to bond the elastomer film (A) to the moisture permeable fiber base material (B). For example, in thermal lamination, it is preferable that the elastomer film side is 75 to 95 ° C., the moisture permeable fiber substrate (nonwoven fabric) side is 80 to 150 ° C., and the pressure is 1.0 to 10 kg / cm ² . Extrusion lamination can be used as another bonding method.

The laminated sheet used in the glove of the present invention has a two-layer structure in which an elastomer film (1) and a moisture-permeable fiber substrate (2) are heat-pressed as shown in the sectional view of FIG. , And a three-layer (sandwich) structure in which a moisture-permeable fiber substrate (2) is sandwiched between two elastomer films (1) and (1) and thermocompression-bonded as shown in the sectional view in FIG. is there. For applications requiring high dust resistance such as in a clean room, those having a three-layer structure are preferable. When processing the above-mentioned two-layer structure base material into gloves, in consideration of the scattering of the fiber base material into the environment in which it is used, the elastomer film is on the outside and the moisture permeable fiber base material (nonwoven fabric) is on the inside ( (Mounting side) is preferable.

The manufacture of gloves is carried out using conventional equipment which is normally used. That is, for example, in the case of a laminated sheet having a two-layer structure, two laminated sheets having an elastomer film on the outside and a moisture permeable fiber substrate on the inside are laminated using a high-frequency velder with a glove mold attached. It is preferable to perform the fusion and cutting by melting at the same time, and then form the insertion portion of the hand by cutting. FIG. 3 shows a perspective view of the glove of the present invention using the base material of the two-layer structure, and FIG. 4 shows a perspective view of the glove of the present invention using the base material of the three-layer structure. The glove of the present invention thus obtained is composed of a laminated sheet of an elastomer film (A) and a moisture-permeable fiber base material (B), has high slip resistance and stretchability, is hard to slip, and has a comfortable hand fit. Is an excellent one.

[0018]

[Effect of the device]

 As explained above, the glove of the present invention has breathability, waterproofness, slip resistance, stretchability and dust resistance, which improves operability and provides a good fit and soft feeling, and long-term wearing. Also suitable for. In addition, since the adhesive is not used when the elastomer film and the moisture-permeable fiber base material are integrated, wearing the gloves directly on the human body has little effect on the human body such as rashes, especially for medical and clean room applications. It is useful as a simple and hygienic glove.

[0019]

[Reference Examples and Examples]

The present invention will be described with reference to examples and examples. Reference Example 1 EPDM (Vistalon 3708, manufactured by Exxon Chemical Co., Ltd.) 55.5% by weight, EVA (DQDJ-3269, manufactured by Nippon Unicar Co., Ltd.) 37% by weight, and linear low-density polyethylene (TFU-2060, A composition comprising 7.5% by weight of Nippon Unicar Co., Ltd. was melt-kneaded by an extruder at 160 ° C., and a film was formed by the air cooling inflation method under the following conditions. Die diameter: 150 mm, blow ratio: 3.5 Extruder cylinder temperature: 160 to 175 ° C Resin temperature at die outlet: 145 to 165 ° C (?) Resin pressure at die outlet: 360 kg / cm ² Extrusion rate …… 65 kg / hour Collection speed ………… 10-20 m / min The obtained elastomer film had a thickness of 40 μm.

Example 1 The elastomer film produced in Reference Example 1 was used as an anti-slip layer, and this was thermocompression-bonded to a nonwoven fabric (viscose rayon) by a thermal lamination method. The thermocompression bonding conditions were 80 ° C. on the elastomer film side, 150 ° C. on the nonwoven fabric side, and the pressure was 6.0 kg / cm ² . Next, the obtained laminated sheet was placed with an elastomer film layer on the outside and a non-woven fabric layer on the inside using a high-frequency velder equipped with a glove mold, and bonding by fusion and cutting by fusion were performed at the same time. The insertion portion was cut to obtain a glove having the structure shown in FIG.

Example 2 The same non-woven fabric used in Example 1 was sandwiched between the elastomer films obtained in Reference Example 1 and heat-laminated by thermal lamination. The thermocompression bonding conditions were a temperature of 100 ° C. and a pressure of 6.0 kg / cm ² . Next, the laminated sheet with the three-layer structure obtained was placed in a high-frequency velder equipped with a glove mold, cutting by melting and joining by fusion were performed at the same time, and then the insertion part of the hand was cut. A glove having the configuration shown in 4 was obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of a laminated sheet used in a glove of the present invention.

FIG. 2 is a cross-sectional view of another laminated sheet example used in the glove of the present invention.

FIG. 3 is a perspective view showing the construction of an embodiment of the glove according to the present invention.

FIG. 4 is a perspective view showing the construction of another embodiment of the glove according to the present invention.

[Explanation of symbols]

 1 Gloves 2 Elastomer film 3 Breathable fiber base material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masahiko Yoshikawa 3-1, Chidoricho, Kawasaki-ku, Kawasaki-shi, Kanagawa Tonen Kagaku Co., Ltd. Technology Development Center

Claims (3)

[Scope of utility model registration request] 1. Ethylene-propylene-diene copolymer (a) 30-70% by weight, vinyl acetate content 5-30% by weight, melt index 0.2-25 g / 10 min ethylene-vinyl acetate copolymer (b). ) A biaxially stretched elastomer film (A) obtained by forming a thermoplastic elastomer composition containing 70 to 30% by weight by an air-cooled inflation method, and a moisture-permeable fiber base material (B).
A glove comprising a laminated sheet obtained by heat-pressing and with an elastomer film having a large number of fine holes. 2. The glove according to claim 1, wherein the (B) surface of a sheet composed of two layers (A) and (B) is the wearing side. 3. The glove according to claim 1, which comprises a sheet having a three-layer structure in which both sides of (B) are sandwiched by (A).