JP2018044269A - mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mask capable of easily deforming a deformable part such as a nose fitter by a user. A mask of the present invention includes a mask main body including a non-woven fabric and a bent portion formed in a peripheral portion of the mask main body. The bent portion has a shore A hardness value immediately after the start of needle contact and a shore A hardness 15 seconds after the start of needle contact, which is measured in the state of a press sheet having a thickness of 3 mm in accordance with JIS K6253. The main component is a thermoplastic resin composition in which the amount of change ΔHS between the value and the value is 5 or more and 50 or less. [Selection diagram] Fig. 1

Description

  The present invention relates to a mask.

  In recent years, there is an increasing demand for masks to protect the body from pollen, viruses, particulate matter such as dust, and the like. The mask usually has a mask main body that covers the user's nostril and mouth, and an ear hook that holds the mask main body on the user's ear. The mask main body is usually formed from a non-woven fabric formed into a shape capable of covering a nostril and mouth such as a rectangle.

  When a mask is worn, if there is a gap between the mask body and the user's face, the user's breath may leak out. For example, since there is a dent between the user's nose and cheek surface, a gap derived from the dent tends to occur on the upper side of the mask main body. If the user's breath leaks through a gap formed on the upper side of the mask main body, the user's glasses may be fogged.

  For this reason, there is a technology to provide a nose fitter that can be bent on the upper side of the mask and to bend the nose fitter according to the shape of the user's face to make it difficult to create gaps and to suppress breath leakage from the upper side of the mask body. It has been. As described in Patent Document 1 and the like, a metal or polyethylene tape or the like is used as the nose fitter.

JP 2006-053237 A

  It is desired to reduce the gap between the mask body and the user's face. As mentioned above, if the user's breath leaks from the gap generated on the upper side of the mask body, the user's glasses may be clouded, and if a gap occurs on the left and right sides or the lower side of the mask body, External air may enter through these gaps and reach the user's mouth, resulting in insufficient protection from pollen, viruses and particulate matter.

  However, with a metal or polyethylene tape as described in Patent Document 1, the degree of softening against stress is too small and it is not easy to bend into a desired shape (unevenness followability is not good). is there. The nose fitter is desired to be easily deformable by the user in accordance with the shape of his / her face.

  In view of the above problems, an object of the present invention is to provide a mask that allows a user to easily deform a deformable portion such as a nose fitter.

The present invention for solving the above problems relates to the following masks.
[1] A mask main body including a non-woven fabric and a bent portion formed in a peripheral portion of the mask main body, and the bent portion is measured in a state of a press sheet having a thickness of 3 mm according to JIS K6253. A thermoplastic resin composition having a change ΔHS between 5 and 50 or less between the Shore A hardness value immediately after the start of pressing needle contact and the Shore A hardness value 15 seconds after the start of pressing needle contact. Mask as an ingredient.
[2] The temperature at which the loss tangent tan δ obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s of the thermoplastic resin composition has a peak value is 25 ° C. or more and 40 ° C. or less. The described mask.
[3] The peak value of loss tangent tan δ obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s of the thermoplastic resin composition is 1.0 or more and 5.0 or less, [1] or [ 2].
[4] The thermoplastic resin composition is selected from a structural unit (i) derived from 4-methyl-1-pentene and an α-olefin having 2 to 20 carbon atoms excluding 4-methyl-1-pentene. 4-methyl-1-pentene / α-olefin copolymer comprising at least one structural unit (ii) derived from α-olefin and optionally including structural unit (iii) derived from non-conjugated polyene When the total of the structural units (i), (ii) and (iii) is 100 mol%, the structural unit (i) is 55 to 85 mol% and the structural unit (ii) is 15 to 45 mol. 4-methyl-1-pentene / α-olefin copolymer (A) containing 0 to 10 mol% of structural unit (iii) and the 4-methyl-1-pentene / α-olefin copolymer Thermoplastic resin The mask according to any one of [1] to [3], which is a composition containing (B).

  According to the present invention, there is provided a mask that allows a user to easily deform a deformable portion such as a nose fitter.

1A, 1B, and 1C are schematic views showing a mask according to an embodiment of the present invention.

  As shown in FIG. 1, a mask 100 according to an embodiment of the present invention has a mask main body 110 that covers a user's nostril and mouth, and a bent portion 120 is formed around the mask main body 110. Is formed. In addition, the mask body 110 may be formed with an ear hook 130 that holds the mask body on the user's ear.

A. Mask body part Mask body part 110 should just be made into the shape which covers at least the field near the tip of a chin among a nostril, a mouth corner, and a throat of a user's face, for example. The mask main body 110 can be, for example, a three-dimensional shape or a planar shape and a substantially rectangular shape. The mask main body 110 may have a substantially pentagonal shape or a substantially hexagonal shape in which the upper side or the lower side is extended so as to be easily hung on the nose or the throat. The mask main body 110 may be multi-stage processed so as to be able to expand and contract in the vertical direction (the direction connecting the user's nose and chin when worn) so that the mask body 110 can be in close contact with the face when worn. The mask body 110 is formed by joining two substantially rectangular sheet materials by fusion or the like so that the mask body 110 can be in close contact with the face when the user wears it. It may be bendable in the direction of connecting the ears.

  The mask main body 110 is formed from a nonwoven fabric or a woven fabric having flexibility and air permeability. The nonwoven fabric or woven fabric may be formed from natural fibers such as paper, rayon and cotton, olefin polymers such as polyethylene and polypropylene, polyesters such as polyester terephthalate (PET), and ethylene-vinyl acetate copolymer. You may form from the synthetic fiber containing vinyl alcohol-type resin etc., such as coalescence (EVA). The mask main body 110 is preferably formed from a laminate in which sheet materials formed from these materials are laminated. At this time, the mask main body 110 may include side sheets on the left and right sides (sides corresponding to the user's ears when worn) and hold the laminate by the side sheets. In addition, it is preferable that the surface which touches a user's skin at least of the mask main-body part 110 is formed from a nonwoven fabric.

B. Bending part
1. The folding part 120 is formed in a line shape around the mask main body part 110, and is configured to be deformable by application of stress. The bent portion 120 may be formed on the outermost peripheral portion of the mask main body portion 110, may be formed inside by a certain width from the outer peripheral portion of the mask main body portion 110, or may be partially formed on the outermost peripheral portion. Alternatively, it may be partially formed in the inner region by a certain width from the outer peripheral portion.

  Further, the bent part 120 may be formed on the upper side of the mask main body part 110 as shown in FIG. 1A, or may be formed on either the left or right side of the mask main body part 110, or the mask main body part. 110 may be formed on the lower side. Moreover, the bending part 120 may be formed in all the peripheral parts of the mask main-body part 110, as shown to FIG. 1B.

  Further, the bent portion 120 may be formed on the front side (the side that does not contact the user) of the mask main body 110 or may be formed on the back side (the side that contacts the user) of the mask main body 110. . When the mask main body 110 is the above-described laminated body, the bent portion 120 may be formed so as to be sandwiched between layers constituting the mask main body 110.

  Further, the bent part 120 may be formed in one continuous line shape on each side of the mask main body part 110, or may be formed in two or more discontinuous lines as shown in FIG. 1C. May be. When the bent portion 120 is formed in two or more discontinuous lines, it may be composed of a plurality of different members. At this time, the plurality of members may be members having different values of ΔHS, which will be described later, according to the shape of the user's face that comes into contact with the plurality of members. For example, in FIG. 1C, in a region where the amount of bending increases because of contact with the vicinity of the user's nose, ΔHS of the bending portion 120-1 is increased and the amount of bending decreases because of contact with the vicinity of the user's cheek. In the region, ΔHS of the bent portion 120-2 may be further reduced.

  When the bent portion 120 is formed on the upper side of the mask main body 110, the user deforms and wears the bent portion 120 according to the shape from his nose to the cheek surface, so that the upper side of the mask main body 110 is placed. It is possible to suppress the leakage of breath from the gap generated in the lens and to suppress fogging of the glasses.

  When the bent part 120 is formed on the left or right side or the lower side of the mask main body 110, the user deforms the bent part 120 according to the shape of his cheek or chin and wears it. Intrusion of external air from the gaps formed on the left and right sides or the lower side can be suppressed. Therefore, such a mask 100 makes it difficult for external air to reach the inside of the user's mouth, and can further enhance the user's protective effect from pollen, viruses, particulate matter, and the like.

  Further, when the end portion (or the vicinity thereof) of the mask is bent in accordance with the shape of the user's face by the bent portion 120, the mask is more easily adhered to the face.

2. The thermoplastic resin composition bent portion 120 is measured in the state of a press sheet having a thickness of 3 mm in accordance with JIS K6253, and the Shore A hardness value immediately after the start of pressing needle contact and 15 seconds from the start of pressing needle contact. The main component is a thermoplastic resin composition having a change amount ΔHS between 5 and 50 or less between the Shore A hardness value later. A thermoplastic resin composition having ΔHS of 5 or more is easily deformed by application of stress. Further, the thermoplastic resin composition having ΔHS of 50 or less is not excessively deformed even when stress is applied, and can be easily adapted to the shape of the user's face. Therefore, a thermoplastic resin composition having ΔHS in the above range is excellent in unevenness followability when the bent portion 120 is used. From the above viewpoint, ΔHS of the thermoplastic resin composition is preferably 10 or more and 40 or less, and more preferably 15 or more and 40 or less.

  The Shore A hardness can be obtained by measuring with a Shore A hardness meter in accordance with JIS K6253 using a 3 mm thick press sheet as a measurement sample. However, if it is difficult to measure the Shore A hardness of the thermoplastic resin composition, the Shore D hardness measured using a Shore D hardness meter instead is estimated as the Shore A hardness of the thermoplastic resin composition. Also good.

  The thermoplastic resin composition preferably has a temperature at which the loss tangent tan δ obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s has a peak value of 25 ° C. or more and 40 ° C. or less. The thermoplastic resin composition having a temperature of 25 ° C. or higher and 40 ° C. or lower is likely to be deformed by pressurization near the human body temperature. Therefore, the thermoplastic resin composition in which the temperature at which tan δ reaches the peak value is in the above range is easily deformed by human hands when the bent portion 120 is used. From the above viewpoint, the temperature at which tan δ of the thermoplastic resin composition has a peak value is preferably 28 ° C. or higher and 40 ° C. or lower, and more preferably 29 ° C. or higher and 38 ° C. or lower.

  The thermoplastic resin composition preferably has a tan δ peak value of 1.0 or more and 5.0 or less. A thermoplastic resin composition having a tan δ peak value of 5.0 or less is easily deformed by application of stress. Further, the thermoplastic resin composition having a tan δ peak value of 1.0 or more is not excessively deformed even when stress is applied, and can be easily adapted to the shape of the user's face. Therefore, the thermoplastic resin composition having a peak value of tan δ in the above range is excellent in unevenness followability when the bent portion 120 is used. Further, since the thermoplastic resin composition having a peak value of tan δ of 1.0 or more has high stress absorbability, the user does not feel uncomfortable when the bent portion 120 is used. From the above viewpoint, the tan δ peak value of the thermoplastic resin composition is preferably 0.5 or more and 4.0 or less, and more preferably 0.8 or more and 3.5 or less.

  tan δ is a dynamic viscoelasticity up to −40 to 150 ° C. at a frequency of 10 rad / s using a strip of 45 mm × 10 mm × 3 mm as a measurement sample and using a viscoelasticity measuring device (for example, MCR301 manufactured by ANTONPaar). It can be determined by measuring the temperature dependence of Specifically, the ratio (G ″ / G ′: loss tangent) between the storage elastic modulus (G ′) and loss elastic modulus (G ″) obtained by the above measurement is tan δ. The temperature at which tan δ reaches the peak value (maximum value) in the range of 0 to 30 ° C. is the temperature at which tan δ becomes the peak value, and the value of tan δ at that time is the peak value of tan δ. In addition, it is thought that the said peak originates in the glass transition temperature of a thermoplastic resin composition.

  Moreover, although the said thermoplastic resin composition may be a foam or an unfoamed body, it is preferable that it is a foam from a viewpoint of improving uneven | corrugated followable | trackability more.

  The thermoplastic resin composition is not limited as long as it satisfies the above-mentioned physical properties. For example, 4-methyl-1-pentene / α-olefin copolymer (A) and 4-methyl-1-pentene are used. -It can be set as the composition containing thermoplastic resins (B) other than an alpha olefin copolymer.

2-1.4-Methyl-1-pentene / α-olefin copolymer (A)
Configuration of 2-1-1.4-methyl-1-pentene / α-olefin copolymer (A) 4-methyl-1-pentene / α-olefin copolymer (A) is 4-methyl-1- A structural unit (ii) derived from at least one α-olefin selected from a structural unit (i) derived from pentene and an α-olefin having 2 to 20 carbon atoms excluding 4-methyl-1-pentene . The 4-methyl-1-pentene / α-olefin copolymer (A) may optionally contain a structural unit (iii) derived from a non-conjugated polyene. The 4-methyl-1-pentene / α-olefin copolymer (A) can be used alone or in combination of two or more.

  The 4-methyl-1-pentene / α-olefin copolymer (A) has a structural unit (i), a structural unit (ii), and a structural unit (iii) of 100% by mole. i) is 55 mol% or more and 85 mol% or less, the structural unit (ii) is 15 mol% or more and 45 mol% or less, and the structural unit (iii) is 0 mol% or more and 10 mol% or less.

  In addition, although the lower limit of the ratio of structural unit (i) is 55 mol%, it is preferable that it is 60 mol%, and it is more preferable that it is 68 mol%. On the other hand, the upper limit value of the proportion of the structural unit (ii) is 85 mol%, preferably 80 mol%, and more preferably 77 mol%. When the proportion of the structural unit (ii) contained in the 4-methyl-1-pentene / α-olefin copolymer (A) is not less than the above lower limit value, the 4-methyl-1-pentene / α-olefin copolymer ( Since the temperature at which tan δ of A) reaches its peak value is around room temperature, the temperature at which tan δ of the thermoplastic resin composition reaches its peak value can be easily adjusted to the above-described range. When the proportion of the structural unit (i) contained in the 4-methyl-1-pentene / α-olefin copolymer (A) is not more than the above upper limit, 4-methyl-1-pentene / α-olefin copolymer Since the coalescence (A) has an appropriate flexibility, it is easy to adjust ΔHS of the thermoplastic resin composition to the above-described range.

  Of course, at this time, the upper limit value of the proportion of the structural unit (ii) is 45 mol%, preferably 40 mol%, and more preferably 32 mol%. On the other hand, the lower limit of the proportion of the structural unit (ii) is 15 mol%, preferably 20 mol%, and more preferably 23 mol%.

  Examples of α-olefins leading to the structural unit (ii) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene. , 1-hexadecene, 1-octadecene, 1-eicosene and the like, a linear α-olefin having 2 to 20 carbon atoms (preferably 2 to 15 carbon atoms, more preferably 2 to 10 carbon atoms) And 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4,4-dimethyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl Branched α-oles having 5 to 20 carbon atoms (preferably 5 to 15 carbon atoms), including -1-hexene, 4-ethyl-1-hexene, 3-ethyl-1-hexene and the like Fin, and the like. Among these, ethylene, propylene, 1-butene, 1-pentene, 1-hexene and 1-octene are preferable, and ethylene and propylene are particularly preferable. The structural unit (ii) may be derived from one of these compounds, or may be derived from two or more compounds.

  Examples of non-conjugated polyenes leading to structural unit (iii) include 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene 4,5-dimethyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 8-methyl-4-ethylidene-1,7-nonadiene, 4-ethylidene-1,7-undecadiene and the like Chain non-conjugated dienes, methyltetrahydroindene, 5-ethylidene-2-norbornene (ENB), 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 5-vinylidene-2-norbornene, 6-chloromethyl -5-isopropenyl-2-norbornene, 5-vinyl-2-norbornene (VNB), 5-isopropenyl-2-no Cyclic non-conjugated dienes including bornene, 5-isobutenyl-2-norbornene, cyclopentadiene, norbornadiene and the like, and 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, Examples include triene including 2-propenyl-2,2-norbornadiene, 4-ethylidene-8-methyl-1,7-nanodiene, and the like. Among these, when the α-olefin leading to the structural unit (ii) is propylene, 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) are used from the viewpoint of increasing the crosslinking efficiency. ) Is preferred. The structural unit (iii) may be derived from one of these compounds, or may be derived from two or more compounds.

  However, the 4-methyl-1-pentene / α-olefin copolymer (A) is preferably substantially composed of the structural unit (i) and the structural unit (ii).

The 4-methyl-1-pentene / α-olefin copolymer (A) preferably satisfies one or more requirements selected from the following requirements (a), (b) and (c).
Requirement (a) ;
The intrinsic viscosity [η] of 4-methyl-1-pentene / α-olefin copolymer (A) measured at 135 ° C. in decalin is preferably 0.1 dL / g or more and 5.0 dL / g or less. 0.5 dL / g or more and 4.0 dL / g or less is more preferable, and 0.5 dL / g or more and 3.5 dL / g or less is more preferable. The 4-methyl-1-pentene / α-olefin copolymer (A) having the intrinsic viscosity [η] in the above range can be easily molded into a sheet-like thermoplastic resin composition.

  The intrinsic viscosity [η] of the 4-methyl-1-pentene / α-olefin copolymer (A) is adjusted to the above range by adding hydrogen during the production by polymerization to control the molecular weight and polymerization activity. be able to.

Requirement (b) ;
Ratio (molecular weight distribution) of weight average molecular weight (Mw) and number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of 4-methyl-1-pentene / α-olefin copolymer (A) : Mw / Mn) is preferably 1.0 or more, 3.5, more preferably 1.2 or more and 3.0 or less, and further preferably 1.5 or more and 2.8 or less. The 4-methyl-1-pentene / α-olefin copolymer (A) in which Mw / Mn is in the above range is less susceptible to lowering of moldability due to low molecular weight and low stereoregular polymer, and is sheet-like thermoplastic. Molding into a resin composition is easy.

  The weight average molecular weight (Mw) of the 4-methyl-1-pentene / α-olefin copolymer (A) measured by gel permeation chromatography (GPC) is 500 or more and 10,000 in terms of polystyrene. It is preferably 1,000 or more, more preferably 1,000 or more and 5,000,000 or less, and further preferably 1,000 or more and 2,500,000 or less.

  Mw / Mn and Mw of the 4-methyl-1-pentene / α-olefin copolymer (A) can be adjusted to the above range by using, for example, a metallocene catalyst.

Requirement (c) ;
Density is measured according to ASTM D 1505 of 4-methyl-1-pentene · alpha-olefin copolymer (A) is preferably at most 870 kg / m ³ or more 830kg / m ^3, 865kg / m more preferably ³ or more 830 kg / m ³ or less, and more preferably not more than 855kg / m ³ or more 830 kg / m ^3. Since the 4-methyl-1-pentene / α-olefin copolymer (A) having the above density in the above range is lightweight, it is easy to produce a bent portion 120 that is less burdensome on the user and less likely to cause discomfort. .

  The density of the 4-methyl-1-pentene / α-olefin copolymer (A) can be appropriately adjusted according to the composition ratio of the structural unit (i) to the structural unit (iii).

  In addition, the intrinsic viscosity [η], Mw / Mn, Mw, and density according to the requirements (a) to (c) can be obtained by the same measurement as that of the thermoplastic resin composition described above.

2-1-2.4-Methyl-1-pentene / α-olefin copolymer (A) production method 4-Methyl-1-pentene / α-olefin copolymer (A) is composed of the above structural unit (i ) To monomer (iii) can be produced by polymerizing in the presence of a suitable catalyst such as a magnesium-supported titanium catalyst or a metallocene catalyst. The polymerization can be carried out by appropriately selecting from liquid phase polymerization methods including solution polymerization and suspension polymerization, and gas phase polymerization methods.

  In the liquid phase polymerization method, an inert hydrocarbon solvent can be used as a solvent constituting the liquid phase. Examples of the inert hydrocarbon include aliphatic hydrocarbons including propane, butane, pentane, hexane, heptane, octane, decane, dodecane, and kerosene, cyclopentane, cyclohexane, methylcyclopentane, and methylcyclohexane. Including alicyclic hydrocarbons, aromatic hydrocarbons including benzene, toluene, and xylene, and halogenated hydrocarbons including ethylene chloride, chlorobenzene, dichloromethane, trichloromethane, and tetrachloromethane, and mixtures thereof. included.

  Further, in the liquid phase polymerization method, bulk polymerization using the monomer itself that leads to the structural unit (i) to the structural unit (iii) as a solvent can be used.

  The structural unit constituting the 4-methyl-1-pentene / α-olefin copolymer (A) by stepwise copolymerization of the monomers leading to the structural unit (i) to the structural unit (iii). It is also possible to appropriately control the composition distribution of (i) to the structural unit (iii).

  The polymerization temperature is preferably −50 ° C. or higher and 200 ° C. or lower, more preferably 0 ° C. or higher and 100 ° C. or lower, and further preferably 20 ° C. or higher and 100 ° C. or lower.

  The polymerization pressure is preferably normal pressure or higher and 10 MPa gauge pressure, and more preferably normal pressure or higher and 5 MPa gauge pressure.

  In the polymerization, hydrogen may be added for the purpose of controlling the molecular weight and polymerization activity of the polymer produced. The amount of hydrogen added is suitably about 0.001 NL or more and 100 NL or less with respect to 1 kg of the total amount of monomers leading to the structural units (i) to (iii).

2-2. Thermoplastic resin (B)
2-2-1. The thermoplastic resin (B) constituting the thermoplastic resin (B) may be any thermoplastic resin other than the 4-methyl-1-pentene / α-olefin copolymer (A).

  The temperature at which the loss tangent tan δ obtained by measuring dynamic viscoelasticity at a frequency of 10 rad / s is a peak value of the thermoplastic resin (B) is preferably less than 0 ° C., and less than −5 ° C. Is more preferable, it is more preferable that it is less than -10 degreeC, and it is especially preferable that it is less than -30 degreeC. The lower limit of the temperature at which tan δ reaches the peak value is not particularly limited, but can be, for example, −60 ° C. From such a thermoplastic resin, it is easy to produce a thermoplastic resin composition having a temperature at which tan δ reaches a peak value of 25 ° C. or more and 40 ° C. or less.

  When the total amount of the 4-methyl-1-pentene / α-olefin copolymer (A) and the thermoplastic resin (B) contained in the thermoplastic resin composition is 100 parts by mass, 4-methyl-1- The upper limit of the content of the pentene / α-olefin copolymer (A) is preferably 90 parts by mass, more preferably 75 parts by mass, still more preferably 60 parts by mass, and 50 parts by mass. Part is particularly preferred. Further, the lower limit of the content of the 4-methyl-1-pentene / α-olefin copolymer (A) is preferably 10 parts by mass, more preferably 15 parts by mass, and 25 parts by mass. More preferably, it is particularly preferably 30 parts by mass. If it is such a composition ratio, the softness | flexibility of a thermoplastic resin composition, stress relaxation property, and uneven | corrugated followable | trackability can be improved more.

  In other words, the lower limit value of the thermoplastic resin (B) content is preferably 10 parts by mass, more preferably 25 parts by mass, further preferably 40 parts by mass, and 50 parts by mass. The upper limit is preferably 90 parts by mass, more preferably 85 parts by mass, further preferably 75 parts by mass, and particularly preferably 70 parts by mass.

  The thermoplastic resin (B) may be an olefin resin (B-1), an olefin elastomer (B-2), a styrene elastomer (B-3), or a thermoplastic elastomer composition (B-4). preferable. Further, the thermoplastic resin (B) may be a thermoplastic resin (B-5) other than the above. One type of these thermoplastic resins (B) may be used alone, or a plurality of types may be used in combination.

2-2-1-1. Olefin resin (B-1)
Examples of the olefin resin (B-1) include a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms, a copolymer of ethylene, an α-olefin having 3 to 20 carbon atoms and a cyclic olefin, Ethylene copolymer having various vinyl compounds such as styrene, vinyl acetate, (meth) acrylic acid and (meth) acrylic acid ester as a comonomer, copolymer of propylene and α-olefin having 4 to 20 carbon atoms, propylene Copolymer of α-olefin having 4 to 20 carbon atoms and cyclic olefin, and propylene copolymer having various vinyl compounds such as styrene, vinyl acetate, (meth) acrylic acid, (meth) acrylic acid ester as a comonomer Etc. are included. The olefin resin (B-1) is low density polyethylene, medium density polyethylene, high density polyethylene, high pressure method low density polyethylene, isotactic polypropylene, syndiotactic polypropylene, poly 1-butene, poly 4-methyl-1- Pentene, poly-3-methyl-1-butene, cyclic olefin copolymer, chlorinated polyolefin and the like are preferable.

2-2-1-2. Olefin elastomer (B-2)
As an example of the olefin-based elastomer (B-2), an elastomer formed from an olefin-based block copolymer can be used. For example, a block copolymer of a polyolefin block that forms a polymer with high crystallinity such as polypropylene that becomes a hard part and a monomer copolymer that shows amorphousness that becomes a soft part can be mentioned. Specifically, an olefin ( Crystalline) / ethylene / butylene / olefin block copolymer, polypropylene / polyolefin (amorphous) / polypropylene block copolymer, and the like. Examples of commercially available olefin-based elastomers (B-2) include DYNARON manufactured by JSR Corporation ("DYNARON" is a registered trademark of the company), Tafmer manufactured by Mitsui Chemicals, Inc. ("Tuffmer" is a registered trademark of the company), Notio ("Notio" is a registered trademark of the company), ENGAGE manufactured by Dow Chemical Co., Ltd. ("ENGAGE" is a registered trademark of the company), VERSIFY ("VERSIFY" is a registered trademark of the company), Vistamaxx ("Vistamaxx" manufactured by ExxonMobil Chemical Co., Ltd.) "Is a registered trademark of the company).

2-2-1-3. Styrene elastomer (B-3)
Examples of the styrene elastomer (B-3) include block copolymers (SBS) of a polystyrene block that becomes a hard part (crystal part) and a diene monomer block that becomes a soft part, hydrogenated styrene / butadiene / styrene. Block copolymer (HSBR), styrene / ethylene / propylene / styrene block copolymer (SEPS), styrene / ethylene / butene / styrene block copolymer (SEBS), styrene / isoprene / styrene block copolymer (SIS) Styrene / isobutylene / styrene copolymer (SIBS), styrene / isobutylene copolymer (SIB), and the like.

  Examples of commercially available products of hydrogenated styrene / butadiene / styrene block copolymer (HSBR) include Dynaron manufactured by JSR Corporation (“DYNARON” is a registered trademark of the company).

  Styrene / ethylene / propylene / styrene block copolymer (SEPS) is obtained by hydrogenating styrene / isoprene / styrene block copolymer (SIS). Examples of SIS commercial products include JSR SIS manufactured by JSR Corporation ("JSR SIS" is a registered trademark of Kuraray Co., Ltd.), Hibler manufactured by Kuraray Co., Ltd. ("Hibler" is a registered trademark of the company), and Clayton D manufactured by Shell Co., Ltd. ("Clayton" is a registered trademark of the company).

  Examples of commercially available products of SEPS include Kuraray Co., Ltd. Septon (“Septon” is a registered trademark of the company), Shell Co., Ltd. Clayton, and the like.

  Examples of commercially available products of SEBS include Asahi Kasei's Tuftec ("Tuftec" is a registered trademark of the company), Shell Inc.'s Clayton, and the like.

  Further, examples of commercially available products of SIBS and SIB include Kaneka's Shibustar (“Sibustar” includes its registered trademark and the like).

2-2-1-4. Thermoplastic elastomer composition (B-4)
The thermoplastic elastomer composition (B-4) is a composition obtained by dynamically crosslinking a mixture containing an ethylene / α-olefin / non-conjugated polyene copolymer [I] and a polyolefin resin [II].

2-2-1-4-1. Ethylene / α-olefin / non-conjugated polyene copolymer [I]
The ethylene / α-olefin / non-conjugated polyene copolymer [I] comprises a structural unit (Ia) derived from ethylene and a structural unit (Ib) derived from an α-olefin. ) / (Ib) is preferably from 50/50 to 95/5, more preferably from 60/40 to 80/20, and even more preferably from 65/35 to 75/25. preferable.

  The content of the structural unit (Ic) derived from the amount of non-conjugated polyene contained in the ethylene / α-olefin / non-conjugated polyene copolymer [I] is the same as that of ethylene / α-olefin / non-conjugated polyene. It is preferable that they are 2 mass% or more and 20 mass% or less with respect to the total mass of polymer [I].

  The α-olefin is preferably an α-olefin having 3 to 20 carbon atoms. Examples of such α-olefins include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1 -Dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-nonadecene, 1-eicocene, 9-methyl-1-decene, 11-methyl-1-dodecene, and 12- Ethyl-1-tetradecene and the like are included. The α-olefin is preferably propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene, and more preferably propylene. These α-olefins may be used alone or in combination of two or more.

  Examples of the non-conjugated polyene include 1,4-hexadiene, 3-methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 4,5-dimethyl. Chain unconjugated dienes such as -1,4-hexadiene, 7-methyl-1,6-octadiene, 8-methyl-4-ethylidene-1,7-nonadiene, and 4-ethylidene-1,7-undecadiene, methyl Tetrahydroindene, 5-ethylidene-2-norbornene (ENB), 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 5-vinylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2 -Norbornene, 5-vinyl-2-norbornene (VNB), 5-isopropenyl-2-norbornene, 5-isobuteni Cyclic non-conjugated dienes such as 2-norbornene, cyclopentadiene, and norbornadiene, and 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2-propenyl-2, Trienes such as 2-norbornadiene and 4-ethylidene-8-methyl-1,7-nanodiene are included. The non-conjugated polyene is preferably 5-ethylidene-2-norbornene (ENB) or 5-vinyl-2-norbornene (VNB).

  The ethylene / α-olefin / non-conjugated polyene copolymer [I] preferably has an iodine value of 1 or more and 50 or less as an index of the content of the structural unit (Ic) derived from the non-conjugated polyene. It is more preferably 5 or more and 40 or less, and further preferably 10 or more and 30 or less.

  The ethylene / α-olefin / non-conjugated polyene copolymer [I] preferably has an intrinsic viscosity [η] measured in decalin at 135 ° C. of 1 dl / g or more and 10 dl / g or less, and 1.5 dl / g or more. More preferably, it is 8 dl / g or less.

  The ethylene / α-olefin / non-conjugated polyene copolymer [I] may be a so-called oil-extended rubber in which a softener, preferably a mineral oil softener, is blended during the production. Examples of the mineral oil-based softener include known mineral oil-based softeners such as paraffinic process oil.

The Mooney viscosity [ML _{1 + 4} (100 ° C.)] of the ethylene / α-olefin / non-conjugated polyene copolymer [I] is preferably 10 or more and 250 or less, and more preferably 30 or more and 150 or less. The ethylene / α-olefin / non-conjugated polyene copolymer [I] may be used alone or in combination of two or more ethylene / α-olefin / non-conjugated polyene copolymers. The ethylene / α-olefin / non-conjugated polyene copolymer [I] can be produced by a conventionally known method.

2-2-1-4-2. Polyolefin resin [II]
Is the polyolefin resin [II] a homopolymer of an α-olefin such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene? Or a copolymer of two or more of the above-mentioned α-olefins, wherein the main α-olefin content is 90 mol% or more. The polyolefin resin [II] preferably has a melting point (Tm) of 70 ° C. or higher and 200 ° C. or lower, and preferably 80 ° C. or higher and 170 ° C. or lower.

  The polyolefin resin [II] preferably has substantially no unsaturated bond in the main chain.

  The polyolefin resin [II] may be used alone or in combination of two or more olefin polymers.

  Among these polyolefin resins [II], propylene polymer (II-1) and ethylene polymer (II-2) are preferable.

2-2-1-4-2-1. Propylene polymer (II-1)
The propylene-based polymer (II-1) is a homopolymer of propylene, a random copolymer of propylene and an α-olefin having 2 to 10 carbon atoms of 10 mol% or less, or a propylene homopolymer and an amorphous polymer. Block copolymer with a propylene / ethylene random copolymer having low or low crystallinity. Examples of the α-olefin having 2 to 10 carbon atoms include ethylene, 1-butene, 1-pentene, and 4-methyl-1-pentene. The propylene polymer (II-1) preferably has a melting point (Tm) of 120 ° C. or higher and 170 ° C. or lower, and more preferably 145 ° C. or higher and 165 ° C. or lower.

  Propylene polymer (II-1) can be commercially available as a polypropylene resin.

  The propylene polymer (II-1) preferably has an isotactic structure, but has a syndiotactic structure, a mixture of these structures, or a part containing an atactic structure. There may be.

  The propylene polymer (II-1) preferably has a melt flow rate (MFR) of 0.05 g / 10 min to 100 g / 10 min measured at a temperature of 230 ° C. and a load of 21.18 N, and 0.1 g More preferably, it is 10 minutes or more and 50 g / 10 minutes or less.

  The propylene polymer (II-1) is polymerized by various known polymerization methods.

2-2-1-4-2-2. Ethylene polymer (II-2)
The ethylene polymer (II-2) is a homopolymer of ethylene or a random copolymer of ethylene and an α-olefin having 2 to 10 carbon atoms of 10 to 10 mol%. Examples of the α-olefin having 2 to 10 carbon atoms include propylene, ethylene, 1-butene, 1-pentene, and 4-methyl-1-pentene. The ethylene polymer (II-2) preferably has a melting point (Tm) of 80 ° C. or higher and 150 ° C. or lower, and more preferably 90 ° C. or higher and 130 ° C. or lower.

  The ethylene-based polymer (II-2) may be commercially available as high-pressure method low-density polyethylene, linear low-density polyethylene, or high-density polyethylene.

  The ethylene polymer (II-2) preferably has a melt flow rate (MFR) measured at a temperature of 230 ° C. and a load of 21.18 N of 0.05 g / 10 min to 100 g / 10 min, 0.1 g More preferably, it is 10 minutes or more and 50 g / 10 minutes or less.

  The ethylene polymer (II-2) is polymerized by various known polymerization methods.

2-2-1-5. Other thermoplastic resins (B-5)
The thermoplastic resin (B) may be a thermoplastic resin (B-5) other than the above. Examples of such thermoplastic resins (B-%) include polyamide resins, including aliphatic polyamides (nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, and nylon 612), polyethylene terephthalate and polybutylene. Polyester elastomers such as terephthalate, vinyl aromatic resins, polystyrene resins including polystyrene, ABS resins, and AS resins, thermoplastic polyurethanes, vinyl chloride resins, vinylidene chloride resins, acrylic resins, ethylene / vinyl acetate copolymers, Ethylene / methacrylic acid acrylate copolymer, known ionomer, ethylene / vinyl alcohol copolymer, polyvinyl alcohol, fluororesin polycarbonate, polyacetal, polyphenylene oxide, polyphenylene Alpha Id polyimide, polyarylate, polysulfone, and polyethersulfone are.

2-2-2. Production method of thermoplastic resin (B) The olefin resin (B-1), olefin elastomer (B-2), styrene elastomer (B-3), and other thermoplastic resins (B-5) described above are: It can be obtained by polymerizing monomers that lead to the structural units constituting them by a known polymerization method.

  The thermoplastic elastomer composition (B-4) is a mixture containing the above-mentioned ethylene / α-olefin / non-conjugated polyene copolymer [I] and polyolefin resin [II], preferably ethylene / α-olefin / non-conjugated. The polyene copolymer [I] and the polyolefin resin [II] are in the range of [I] / [II] (mass ratio) of 90/10 to 5/95, more preferably 70/30 to 10/90. It can be obtained by dynamically crosslinking a mixture containing a predetermined amount of a mixture containing a known softener or the like, if necessary. When dynamic crosslinking is performed, it is preferable to dynamically heat-treat in the presence of a known crosslinking agent or in the presence of the above-described crosslinking agent and a known crosslinking aid. Here, “dynamically heat-treating” means kneading in a molten state.

The dynamic heat treatment is preferably performed in a non-open type apparatus. The dynamic heat treatment is preferably performed in an atmosphere of an inert gas such as nitrogen or carbon dioxide. The temperature of the heat treatment is in the range from the melting point of the polyolefin resin [II] to 300 ° C., preferably 150 ° C. to 270 ° C., more preferably 170 ° C. to 250 ° C. The kneading time is preferably 1 minute or more and 20 minutes or less, and more preferably 1 minute or more and 10 minutes or less. At this time, 10 sec ^-1 or more 50,000Sec ^-1 or less at a shear rate, preferably 100 sec ^-1 or more 10,000Sec ^-1 less shear force is preferably applied.

  As a kneading apparatus, a mixing roll, an intensive mixer (for example, a Banbury mixer, a kneader), a uniaxial or biaxial extruder can be used, and a non-open type apparatus is preferable.

2-3. The other component thermoplastic resin composition may further contain additives other than those described above, if necessary.

  For example, the thermoplastic resin composition is a weather resistance stabilizer, heat resistance stabilizer, antistatic agent, anti-slip agent, anti-blocking agent, anti-fogging agent, lubricant, pigment, dye, as long as the object of the present invention is not impaired. Contains additives such as plasticizers, anti-aging agents, hydrochloric acid absorbers, antioxidants, crystal nucleating agents, antifungal agents, antibacterial agents, flame retardants, fillers (inorganic fillers, organic fillers), and softeners But you can.

  Examples of the softening agent include process oil, lubricating oil, paraffin, liquid paraffin, polyethylene wax, polypropylene wax, petroleum-based substances including petroleum asphalt and petroleum jelly, coal tars including coal tar and coal tar pitch, castor Oils, linseed oil, rapeseed oil, fatty oils including soybean oil and coconut oil, waxes including tall oil, beeswax, carnauba wax and lanolin, ricinoleic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, Fatty acids or their metal salts including montanic acid, oleic acid and erucic acid, synthetic polymers including petroleum resin, coumarone indene resin and atactic polypropylene, dioctyl phthalate, dioctyl adipate and dioctyl sebacate Le plasticizer, microcrystalline wax, liquid polybutadiene or its modified product or hydrogenated product, as well as known softeners including liquid Thiokol.

  Examples of the filler include powder fillers such as mica, carbon black, silica, calcium carbonate, talc, graphite, stainless steel, and aluminum; fibrous fillers including glass fibers and metal fibers, and hydrophilic layered clay minerals. , And hydrophilic inorganic compounds having a known specific shape (excluding layered shape).

  Examples of the hydrophilic layered clay mineral include a phyllosilicate mineral in which a plurality of two-dimensional layers are laminated, for example, smectite. Smectite is a montmorillonite mineral. Examples of smectites include: montmorillonite (montmorillonite), magnesia montmorillonite, tetsu montmorillonite, tetsumagnesian montmorillonite, beidellite, aluminian beidelite, nontronite, aluminian nontronite, saponite (saponite) ), Aluminian support stone, hectorite, soconite, stevensite, and bentonite.

  Examples of the hydrophilic layered clay mineral include vermiculite (vermiculite), halloysite, swellable mica, and graphite. Examples of such commercial products of hydrophilic layered clay minerals include Kunimine Industries Co., Ltd. Kunipia series (Montmorillonite), Hojun Co., Ltd. Wengel series (Bentonite), and Co-op Chemical Co., Ltd. Somasif ME series (swelling mica). And synthetic products such as smecton (saponite) manufactured by Kunimine Kogyo Co., Ltd., Lucentite SWN series (hectorite) manufactured by Corp Chemical, and laponite (hectorite) manufactured by Rockwood Holdings. In general, since the synthetic product has a smaller maximum length than that of the natural product and small oil droplets can be obtained, the hydrophilic layered clay mineral is preferably a synthetic product.

  Examples of the flame retardant include inorganic compounds such as antimony flame retardant, aluminum hydroxide, magnesium hydroxide, zinc borate, guanidine flame retardant, zirconium flame retardant, ammonium polyphosphate, ethylenebistris (2-cyanoethyl) Phosphonium chloride, tris (tribromophenyl) phosphate, tris (tribromophenyl) phosphate, phosphate esters such as tris (3-hydroxypropyl) phosphine oxide and other phosphorus compounds, chlorinated paraffin, chlorinated polyolefin, Chlorinated flame retardants such as chlorocyclopentadecane, hexabromobenzene, ethylene bisdibromonorbornane dicarboximide, ethylene bistetrabromophthalimide, tetrabromobisphenol A derivatives, tetrabromobisphenol Le S, and tetrabromobisphenol dipentaerythritol brominated flame retardants, and the like, and mixtures thereof.

  The total amount of these additives used is a thermoplastic resin other than 4-methyl-1-pentene / α-olefin copolymer (A) and the 4-methyl-1-pentene / α-olefin copolymer. The total of (B) and 100 parts by mass is preferably 0.001 to 50 parts by mass.

2-4. Production method of thermoplastic resin composition The thermoplastic resin composition can be produced by a known method. For example, the 4-methyl-1-pentene / α-olefin copolymer (A) described above, and a thermoplastic resin (B) other than the 4-methyl-1-pentene / α-olefin copolymer, and optionally The above-mentioned other components contained can be mixed to obtain a thermoplastic resin composition. At this time, you may heat and mix above the melting temperature of each said resin.

C. Ear hook 130
The ear hooks 130 are string-like or belt-like members provided at the left and right ends of the mask main body 110, and are configured to be able to hold the mask 100 by being hung on both ears of the user. The ear hook 130 can be formed of the same material as the mask main body 110. The ear hook 130 and the mask main body 110 are preferably made of the same material.

  Alternatively, the mask body 110 may be cut into the mask body 110 so that the left and right ends of the mask body 110 are formed in an annular shape, and formed integrally with the ear hook 130 and the mask body 110.

D. Mask Manufacturing Method The mask 100 can be manufactured by bonding the bent portion 120 and the ear hook 130 to the mask main body 110. These adhesion methods are not particularly limited, and can be appropriately selected depending on the material of the bent portion 120 and the ear hook portion 130. Examples of the bonding method include bonding with an adhesive, thermal fusion, ultrasonic fusion, and stitching.

  Further, the ear hook 130 may be formed by cutting the mask body 110 so that the left and right ends of the mask body 110 are formed in an annular shape.

DESCRIPTION OF SYMBOLS 100 Mask 110 Mask main-body part 120, 120-1, 120-2 Bending part 130 Ear hook part

Claims (4)

A mask body including a nonwoven fabric;
A bent portion formed in the peripheral portion of the mask body,
The bent portion is
According to JIS K6253, the Shore A hardness value immediately after the start of the contact with the press needle and the Shore A hardness value 15 seconds after the start of the contact with the press needle, measured in a state of a press sheet having a thickness of 3 mm. The main component is a thermoplastic resin composition having a change amount ΔHS between 5 and 50.
mask.   2. The mask according to claim 1, wherein a temperature at which a loss tangent tan δ obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s of the thermoplastic resin composition reaches a peak value is 25 ° C. or more and 40 ° C. or less. .   The peak value of loss tangent tanδ obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s of the thermoplastic resin composition is 1.0 or more and 5.0 or less, according to claim 1 or 2. mask. The thermoplastic resin composition is
Configuration derived from at least one α-olefin selected from the structural unit (i) derived from 4-methyl-1-pentene and the α-olefin having 2 to 20 carbon atoms excluding 4-methyl-1-pentene Including unit (ii),
A 4-methyl-1-pentene / α-olefin copolymer which may optionally contain structural units (iii) derived from non-conjugated polyenes,
When the total of the structural units (i), (ii) and (iii) is 100 mol%,
The structural unit (i) is 55 to 85 mol%,
15 to 45 mol% of the structural unit (ii),
Containing 0 to 10 mol% of the structural unit (iii),
4-methyl-1-pentene / α-olefin copolymer (A),
A thermoplastic resin (B) other than the 4-methyl-1-pentene / α-olefin copolymer;
The mask of any one of Claims 1-3 which is a composition containing this.

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