JP3004306B2 - Work gloves - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a working glove that can be used extremely suitably in the production or handling sites of electronic equipment, precision equipment, food, medical equipment, and the like.

(Prior art) In recent years, at manufacturing sites such as IC production factories, in many cases, gloves must be worn to prevent dust and various secretions from hands from adhering to IC products, etc. Conventionally, synthetic resin gloves such as polyethylene, polyvinyl chloride, and polyurethane have been frequently used.

However, among these existing gloves, those made of polyethylene are inexpensive and economical, but on the other hand, because of their poor elasticity, they are poorly fitted to the fingers and are required for precision work that requires fine movement of the hands. Is unsuitable and has a problem of lacking a soft feeling in terms of touch.

In addition, polyvinyl chloride gloves require the addition of multiple plasticizers to improve flexibility, and bleed of this plasticizer adheres to products handled, causing various troubles. However, at present, there are also serious problems in cold resistance, incineration and the like.

Furthermore, although polyurethane gloves have high strength and excellent impact resistance, they are not only expensive but have a limited range of use compared to other resins, and they are not flexible enough. The existing plastic gloves are not always satisfactory because all of the existing synthetic resin gloves have practical advantages and disadvantages. It was.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a very good fit due to its excellent flexibility and elasticity, and to provide a soft touch. Cold resistance,
An object of the present invention is to economically provide working gloves having excellent durability such as chemical resistance.

(Means for Solving the Problems) The present inventors have conducted intensive studies on a film suitable for work gloves from the viewpoint of the material, and as a result, have found that a specific thermoplastic polyolefin-based elastomer and an aromatic vinyl compound-conjugated diene block can be used. A film made of a polymer alloy with a polymer,
Focusing on the point that extremely soft and rich in elasticity, a soft touch can be obtained, if it is a working glove made using such a film, the fit, plasticity as seen in the conventional synthetic resin gloves described above. The present inventors have found that various problems relating to bleed-out of an agent and the like can be solved at once, and have reached the present invention.

That is, the present invention relates to a polyolefin resin and ethylene / α.
-20 to 70% by weight of a thermoplastic polyolefin-based elastomer comprising an olefin-based copolymer rubber and at least one of which is partially crosslinked, and an aromatic vinyl compound having an aromatic vinyl compound content of 10 to 60% by weight- Thickness of 10 to 80 consisting of 80 to 30% by weight of the conjugated diene block copolymer
The present invention relates to a working glove obtained by cutting and welding two films having elasticity of μ into a glove shape.

Hereinafter, the configuration, operation, and effect of the working glove of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an example of the working glove of the present invention, wherein reference numerals 1 and 2 in the figure denote a film made of a polymer alloy of a thermoplastic polyolefin-based elastomer and an aromatic vinyl compound-conjugated diene block copolymer. Reference numeral 3 denotes a peripheral welded portion of the glove, and reference numeral 4 denotes a wrist opening.
FIG. 2 is an enlarged sectional view taken along the line II of FIG.

The thermoplastic polyolefin-based elastomer used in the present invention comprises a polyolefin-based resin and an ethylene / α-olefin-based copolymer rubber as essential components, and at least one of them is partially crosslinked.

Representative examples of such thermoplastic polyolefin-based elastomers include (A) 5 to 40% by weight of a polyolefin-based resin and (B) ethylene-α-olefin-based copolymer rubber 60 to 40% by weight.
95% by weight (C) Partial crosslinking obtained by dynamically heat-treating a mixture of 40 to 150 parts by weight of a softening agent with respect to 100 parts by weight of a resin composed of (A) + (B) in the presence of a crosslinking agent. Mold elastomer.

Here, as the polyolefin resin (A), a homo- or copolymer of α-olefin selected from ethylene, propylene, butene-1, hexene-1, 4-methyl-pentene-1, etc., or the α-olefin And 15 mol%
Copolymers with the following other polymerizable monomers, for example, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and the like are exemplified.

The ethylene / α-olefin copolymer rubber (B) used in the present invention includes ethylene and propylene,
-Random copolymers with α-olefins such as butene, 1-pentene and 1-hexene, comprising 1,4-hexadiene, dicyclopentadiene, cyclooctadiene,
-A random copolymer obtained by copolymerizing a polyene component such as ethylidene-2-norbornene may be used. The ethylene / α-olefin copolymer rubber has an ethylene content of
Those having 60 to 90% by weight are preferred in view of film formability and flexibility of the obtained film.

The mixing ratio of the polyolefin resin and the ethylene / α-olefin copolymer rubber is such that the ethylene / α-olefin copolymer rubber is 60 to 95% by weight based on the former polyolefin resin of 5 to 40% by weight. Preferably, the polyolefin resin is less than 5% by weight, that is, ethylene.
If the content of the α-olefin copolymer rubber is more than 95% by weight, the drawdown property is lowered and not only the stable molding of the film becomes difficult, but also the problem that the rubber odor becomes severe occurs, while the polyolefin resin is 40% by weight. If it is larger, both the flexibility and the elasticity are reduced, and it is difficult to obtain a soft and good-touch product.

The thermoplastic polyolefin-based elastomer used in the present invention, the polyolefin-based resin and ethylene-α-
It is preferable to further add a softening agent (C) to the olefin-based copolymer rubber.
Among mineral oils called process oils or extender oils used for improving processability and the like, paraffinic or naphthenic hydrocarbon oils having 30% or less aromatic hydrocarbons.

The blending ratio of the softener is a resin 10 composed of the polyolefin resin and the ethylene / α-olefin copolymer rubber.
It is preferable to blend 40 to 150 parts by weight with respect to 0 parts by weight.If the blending ratio of the softener is less than 40 parts by weight, it becomes difficult to obtain a soft touch, while if it exceeds 150 parts by weight, it is included in the resin. The softener that cannot be removed easily bleeds out and causes problems such as blocking.

The film constituting the working glove according to the present invention is such that the thermoplastic polyolefin-based elastomer is 20 to 70% by weight, and the aromatic vinyl compound-conjugated diene block copolymer is 80 to 30% by weight, preferably the thermoplastic polyolefin-based elastomer. The composition comprises a composition obtained by adding 70 to 40% by weight of an aromatic vinyl compound-conjugated diene block copolymer to 30 to 60% by weight of an elastomer, and the amount of the thermoplastic polyolefin-based elastomer in 100% by weight of the composition is 20%. If the content is less than 10% by weight, durability such as chemical resistance and heat resistance is reduced, slipperiness is poor, and it is difficult to put on and take off gloves. In addition, a soft touch cannot be obtained, and the texture as work gloves is deteriorated. . On the other hand, if the amount of the thermoplastic polyolefin-based elastomer is more than 70% by weight, the texture of the obtained film is poor in addition to the decrease in elasticity, and even in this case, a soft touch cannot be obtained.

In the present invention, the aromatic vinyl compound-conjugated diene block copolymer includes at least one polymer block of an aromatic vinyl compound and at least one polymer block of a conjugated diene compound. AB) n type, (AB) nA type, (AB) n
-C type or the like, wherein A is a polymer block of an aromatic vinyl compound, B is a polymer block of a conjugated diene compound, C is a residue of a coupling agent, and n is an integer of 1 or more. These may be linear or radial.

Here, styrene, α-
Methyl styrene, o-methyl styrene, m-methyl styrene, p-methyl styrene and the like can be used, and among them, styrene is particularly preferable, and as the conjugated diene, 1,3-butadiene, isoprene and the like are used.
1,3-butadiene is preferred.

The aromatic vinyl compound-conjugated diene block copolymer used in the present invention is, in principle, one in which the conjugated diene portion is not hydrogenated from the viewpoint of economic advantage. In this case, a partially hydrogenated product may be used in combination, or a block copolymer obtained by copolymerizing a small amount of another copolymerizable compound may be used.

The content of the aromatic vinyl compound in the aromatic vinyl compound-conjugated diene block copolymer is 10 to 60% by weight, preferably 15 to 50% by weight, and the content of the aromatic vinyl compound is less than 10% by weight. In the case of (1), not only the film strength is lowered, but also the obtained glove has poor slipperiness and is easily broken when the glove is put on and taken off. On the other hand, when the content of the aromatic vinyl compound is more than 60% by weight, the stretchability is impaired, and a glove having an excellent fit cannot be obtained.

The film constituting the working glove of the present invention has a thickness of 10
To 80μ, preferably 20 to 60μ.

That is, the working glove of the present invention is not only a function as a mere finger protector, but rather has a feature in emphasizing functionality such as soft touch and excellent fit to fingers, and the like, The requirement relating to the film thickness is indispensable together with the fact that a film made of a specific polymer alloy of a thermoplastic polyolefin-based elastomer and an aromatic vinyl compound-conjugated diene block copolymer is used as a glove material. Specifically, if the film thickness is less than 10μ, the fingers when attaching and detaching the gloves are likely to be caught on the film and easily torn because the flexibility is too good, while on the other hand the fit becomes worse when the film thickness is more than 80μ, This causes a problem in that the restraining force against the movement of the fingers is increased and the fatigue of the fingers is increased in a long operation.

Further, the film constituting the working glove of the present invention is obtained by adding at least one lubricant selected from a petroleum-based or amide-based wax and an inorganic filler such as silica, calcium carbonate, and magnesium silicate. In addition to adjusting the slipperiness of the film and improving the glove detachability, additives such as coloring agents, antistatic agents, weathering agents, antibacterial agents, and resins such as polyolefins, polyvinyl chlorides, and polyurethanes Alternatively, an elastomer may be appropriately compounded as long as the object of the present invention is not impaired.

In the present invention, as a method for producing a stretchable film, the thermoplastic polyolefin-based elastomer and the aromatic vinyl compound-conjugated diene block copolymer are kneaded at a specific compounding ratio, and then a T-die or an inflation is performed. Generally, a method of forming a film so as to have a thickness of 10 to 80 μm by using a forming machine such as the one described above. The work glove of the present invention is obtained by laminating two such films and cutting and welding them into a glove shape. The cutting and welding at that time are cut with a cutter or the like, and then, a heat bar, high frequency, ultrasonic wave, etc. May be welded with a heated glove, but it is more efficient to perform cutting and welding at the same time by a method such as a fusing seal.

Further, in the present invention, the shape of the gloves is excellent in the fit property and slightly better than the size of the fingers because of the use of a flexible and highly stretchable film as a material, but is particularly limited. No, even a standardized shape can be used.

(Examples) Hereinafter, the working gloves of the present invention will be described in more detail with reference to examples in order to further facilitate understanding, but the present invention is not limited to these examples. The methods for measuring and evaluating the properties of the working gloves of the present invention are as follows.

(1) 100% modulus stress (unit: g / cm) A tensile test was performed according to the method specified in JISK6301, and the stress at 100% elongation was measured. The 100% modulus stress serves as an index of the flexibility of the film. The smaller the stress, the smaller the force for restraining the movement of the fingers, and the more preferable the working glove.

(2) Permanent elongation (unit:%) This is an index of the extensibility of the film. A strip-shaped film is held at 100% elongation for 1 minute by the method specified in JISK6301, and 3 minutes have passed since the elongation was released. The length (L) of the test piece at that time was measured. Permanent elongation was calculated by the following equation.

(3) Glove attachment / detachment Glove attachment / detachment was performed smoothly (○), and film that was difficult to attach / detach to fingers due to poor slipperiness or too good flexibility (×). did.

(4) Fitting property Evaluation of the feeling of fitting when gloves were worn. Those with soft touch and good fit to the shape of fingers due to their excellent elasticity (good), and those not so good (poor) ).

(5) Comprehensive evaluation Based on the measurement results of 100% modulus stress, permanent elongation, glove attachment / detachment, fit, etc., the quality of work gloves was comprehensively evaluated. Defective ones were marked (x).

Examples 1 to 4 and Comparative Examples 1 to 2 Pellets made of a thermoplastic polyolefin-based elastomer and pellets made of an aromatic vinyl compound-conjugated diene block copolymer shown below are dry-blended at various mixing ratios, and then the blend is prepared. The composition was fed to an inflation extruder to provide a resin temperature of 170 to 190, respectively.
° C, extrusion rate 9.1kg / hr, blow-up ratio 2.4, take-off speed about 5
A film was formed under each condition of m / min so that the thickness became 40 μm.

(Thermoplastic polyolefin elastomer) 100 parts by weight of a resin composed of 25% by weight of isotactic polypropylene and 75% by weight of a partially crosslinked ethylene-propylene-dicyclopentadiene terpolymer rubber having an ethylene content of 70% by weight A thermoplastic polyolefin-based elastomer obtained by adding and kneading 80 parts by weight of a paraffin-based process oil as a softener and having a melt index of 2.9 g / 10 minutes.

(Aromatic vinyl compound-conjugated diene block copolymer) Styrene and 1,3-butadiene are copolymerized at a weight ratio of 40:60, weight average molecular weight of about 200,000, melt index
Aromatic vinyl compound-conjugated diene block copolymer at 24.5 g / 10 min.

Successively, the obtained films are superposed two by two,
Working gloves were produced by cutting and welding into a glove shape. Table 1 shows the removability and fit of these gloves, and the 100% modulus and permanent elongation of the film used for the gloves.

Table 1 shows commercially available polyethylene for reference.
The same measurement was performed for gloves made of polyvinyl chloride and polyurethane, and the results are described.

Examples 5 to 7 and Comparative Examples 3 to 4 A film having a thickness of 50 μm was obtained in the same manner as in Example 3 except that the copolymerization ratio of styrene and butadiene in the aromatic vinyl compound-conjugated diene block copolymer was variously changed. Was molded.

Next, two sheets of the obtained films were superposed and fused and sealed in the form of a glove, thereby producing a working glove. Table 2 shows the detachability and fit of these gloves, and the 100% modulus stress and permanent elongation of the film used for the gloves.

Examples 8-11, Comparative Examples 5-6 The blow-up ratio during inflation extrusion was 2.0
To 3.2, and different films having a thickness of 8 μm to 90 μm were formed in the same manner as in Example 3 except that the take-off speed was changed in the range of 3 to 8 m / min.

Subsequently, two sheets of each of these films were superposed and melt-sealed in the form of a glove to prepare a working glove. Table 3 shows the detachability and fit of the glove obtained, and the 100% modulus stress and permanent elongation of the film used for the glove.

From the data on each of these Examples and Comparative Examples, the mixing ratio of the thermoplastic polyolefin-based elastomer and the aromatic vinyl compound-conjugated diene block copolymer, and the aromatic vinyl compound in the aromatic vinyl compound-conjugated diene block copolymer It was confirmed that all of the compounds having a compound content and a film thickness within the range of the present invention had a soft touch, were excellent in detachability and fit, and were extremely suitable as work gloves.

(Effects of the Invention) As described above, the working glove of the present invention provides flexibility, stretchability, and weather resistance obtained by a polymer alloy of a specific thermoplastic polyolefin-based elastomer and an aromatic vinyl compound-conjugated diene block copolymer. In addition, because it is made of a film with excellent economic efficiency, in addition to the soft touch and excellent fit that are not seen in conventional synthetic resin gloves such as polyethylene and polyvinyl chloride,
It has many features such as no bleeding problem of plasticizers and the like.

In addition, the work glove of the present invention is excellent in flexibility and elasticity, so that it has a small restraining force against the movement of a finger, and also has an excellent fit property in addition to an advantage that a feeling of fatigue does not remain even when working for a long time. Particularly suitable for working gloves in various food manufacturing plants, IC manufacturing plants, precision equipment manufacturing plants, etc., or surgical gloves in medical facilities, where fine movement of hands is required, and greatly contributes to improvement of working efficiency Can be done.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a working glove according to the present invention, and FIG. 2 is an enlarged sectional view taken along line II of FIG. 1 ... front side film, 2 ... back side film, 3 ...
Peripheral weld, 4 ... Wrist opening

Claims (2)

(57) [Claims] 1. A thermoplastic polyolefin-based elastomer comprising a polyolefin-based resin and an ethylene / α-olefin-based copolymer rubber and at least one of which is partially crosslinked, and an aromatic vinyl compound content. But
For work obtained by cutting and welding two films having a thickness of 10 to 80 μ and a stretchability of 10 to 60% by weight of an aromatic vinyl compound-conjugated diene block copolymer of 80 to 30% by weight into a glove shape. gloves. 2. The thermoplastic polyolefin-based elastomer comprising the polyolefin-based resin according to claim 1 and an ethylene / α-olefin-based copolymer rubber, and at least one of which is partially crosslinked, is a polyolefin-based resin 5 to
40% by weight of ethylene / α-olefin copolymer rubber 95
The working glove according to claim 1, wherein a softening agent is blended in an amount of 40 to 150 parts by weight with respect to 100 parts by weight of the resin consisting of 1 to 60% by weight.