JP2006052364A - Resin composition, molded product thereof and resin product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition having good ultrasonic adhesiveness to nonwoven fabrics in a wider range; to provide a molded product of the resin composition; and to provide a resin product having the molded product. <P>SOLUTION: The resin composition contains a polyurethane resin and a resin obtained by copolymerizing at least an olefin and a vinyl monomer having a polar group. The molded product is obtained by molding the resin composition. The resin product has the molded product. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin composition, a molded article of the resin composition, and a resin product.

  Polyurethane foam tapes, stretchable films, rubber threads, polyurethane elastic yarns, and the like are used as materials for gathering the waist gathers of disposable diapers and sanitary napkins. In particular, polyurethane elastic yarns are used for disposable diapers (see Patent Document 1). The reason for this is that the elastic yarn made of polyurethane expands and contracts with a weak force, and the elastic strain is also small. It can be ensured and workability is excellent. However, polyurethane elastic yarns have low thermal and ultrasonic adhesive properties with polypropylene nonwoven fabrics, polyethylene nonwoven fabrics, polyester nonwoven fabrics, and composite nonwoven fabrics thereof. It is necessary to use a hot melt adhesive such as. Furthermore, since the elastic yarn made of polyurethane has a circular cross section, there may be a problem in the adhesive strength when the hot melt adhesive is used.

On the other hand, rubber cords, wooly nylon cords, polyurethane cords and the like are used as the ear straps of the nonwoven fabric simple mask. However, since a simple mask for manufacturing semiconductors dislikes dust, it is not possible to use a rubber string to which powder is adhered and a wooly nylon string having fuzz. In addition, polyurethane cords have low ultrasonic adhesion to polypropylene nonwoven fabrics, so they can be handled by making the cords thicker. There was a problem of feeling pain. Therefore, it is known that ear pain can be prevented by fixing a string of plastic films on both sides of a flexible polyurethane foam to a mask by heat fusion (see Patent Document 2). However, this method requires a step of attaching a plastic film, which increases the cost.
JP 2000-289931 A JP 2002-65878 A

  The present invention provides a resin composition having good ultrasonic adhesiveness with a wider range of nonwoven fabrics, a molded article of the resin composition, and a resin product having the molded article, in view of the problems of the above-described conventional techniques. The purpose is to do.

  The invention described in claim 1 is characterized in that the resin composition contains a polyurethane resin and a resin obtained by copolymerizing at least an olefin and a vinyl monomer having a polar group.

  According to the invention described in claim 1, since it contains a polyurethane resin and a resin obtained by copolymerizing at least an olefin and a vinyl monomer having a polar group, the resin has good ultrasonic adhesion with a wider range of nonwoven fabrics. A composition can be provided.

  The invention according to claim 2 is the resin composition according to claim 1, wherein the content of the polyurethane resin is 30 parts by weight or more and 85 parts by weight or less, and the content of the copolymerized resin is: It is 10 parts by weight or more and 50 parts by weight or less.

  According to the invention of claim 2, the content of the polyurethane resin is 30 parts by weight or more and 85 parts by weight or less, and the content of the copolymerized resin is 10 parts by weight or more and 50 parts by weight or less. Therefore, the copolymerized resin can enhance the ultrasonic adhesion between a wider range of nonwoven fabric and polyurethane resin.

  The invention according to claim 3 is the resin composition according to claim 1 or 2, wherein the olefin is one or more olefins selected from the group consisting of ethylene, propylene and 1-butene. To do.

  According to the invention described in claim 3, since the olefin is one or more olefins selected from the group consisting of ethylene, propylene and 1-butene, a copolymerized resin and a wider range of nonwoven fabrics The compatibility of can be improved.

  Invention of Claim 4 is a resin composition as described in any one of Claims 1 thru | or 3. The vinyl monomer which has the said polar group is a group which consists of acrylate ester, methacrylate ester, and vinyl carboxylate. It is one or more monomers selected from the above.

  According to invention of Claim 4, since the vinyl monomer which has the said polar group is 1 or more types of monomers selected from the group which consists of acrylic acid ester, methacrylic acid ester, and vinyl carboxylate, it was copolymerized The compatibility between the resin and the urethane resin can be increased.

The invention according to claim 5 is the resin composition according to claim 4, wherein the acrylic ester has the general formula CH ₂ ═CH—COOC ₁ H _{2l + 1.}
Wherein the methacrylic acid ester has the general formula CH ₂ ═C (CH ₃ ) —COOC _m H _{2m + 1}
Wherein the vinyl carboxylate has the general formula CH ₂ ═CH—OCOC _n H _{2n + 1}
Wherein l, m, and n are each an integer of 1 or more and 4 or less.

According to the invention described in claim 5, the acrylate ester has the general formula CH ₂ ═CH—COOC ₁ H _{2l + 1.}
Wherein the methacrylic acid ester has the general formula CH ₂ ═C (CH ₃ ) —COOC _m H _{2m + 1}
Wherein the vinyl carboxylate has the general formula CH ₂ ═CH—OCOC _n H _{2n + 1}
Since l, m, and n are each an integer of 1 or more and 4 or less, the compatibility between the copolymerized resin and the urethane resin can be improved.

  The invention according to claim 6 is the resin composition according to any one of claims 1 to 5, wherein the content of the vinyl monomer having the copolymerized polar group in the copolymerized resin is: 15 wt% or more and 30 wt% or less.

  According to the invention described in claim 6, since the content of the copolymerized vinyl monomer having the polar group in the copolymerized resin is 15 wt% or more and 30 wt% or less, the resin composition It is possible to achieve both the stretchability and the blocking resistance.

  The invention described in claim 7 is characterized in that the resin composition according to any one of claims 1 to 6 further contains an inorganic filler.

  According to the seventh aspect of the invention, since the inorganic filler is further contained, the blocking resistance and the heat resistance can be improved.

  The invention according to claim 8 is the resin composition according to claim 7, wherein the content of the inorganic filler is 2 parts by weight or more and 20 parts by weight or less.

  According to the invention described in claim 8, since the content of the inorganic filler is 2 parts by weight or more and 20 parts by weight or less, blocking resistance and heat resistance are obtained without reducing the strength of the polyurethane resin composition. Can be improved.

  The invention according to claim 9 is an ABA block copolymer having a polymer block A made of styrene and a polymer block B made of a conjugated diene monomer in the resin composition according to claims 1 to 8. It further comprises a resin obtained by adding hydrogen to the coalescence and modifying the maleic acid.

  According to the ninth aspect of the present invention, hydrogen is added to the ABA type block copolymer having the polymer block A made of styrene and the polymer block B made of the conjugated diene monomer, and then modified with maleic acid. Furthermore, the dispersibility of the inorganic filler can be improved.

  The invention described in claim 10 is the resin composition according to claim 9, wherein the conjugated diene monomer is at least one of butadiene and isoprene.

  According to the invention described in claim 10, since the conjugated diene monomer is at least one of butadiene and isoprene, a block copolymer with styrene can be synthesized by a living anionic polymerization method.

  The invention according to claim 11 is the resin composition according to claim 9 or 10, wherein the content of the maleic acid-modified resin is 1 part by weight or more and 10 parts by weight or less.

  According to the invention described in claim 11, since the content of the maleic acid-modified resin is 1 part by weight or more and 10 parts by weight or less, the inorganic filler can be used without reducing the strength of the polyurethane resin composition. The dispersibility of can be improved.

  The invention described in claim 12 is characterized in that in the molded body, the resin composition according to any one of claims 1 to 11 is molded.

  According to invention of Claim 12, since the resin composition as described in any one of Claims 1 thru | or 11 is shape | molded, shaping | molding with favorable ultrasonic adhesiveness with a wider range of nonwoven fabrics The body can be provided.

  The invention as set forth in claim 13 is characterized in that the molded body according to claim 12 is further annealed in a stretched state.

  According to the thirteenth aspect of the present invention, since the annealing is performed in a stretched state, the stretching strain under a low stress can be reduced and the stretchability can be improved.

  According to a fourteenth aspect of the present invention, a resin product includes the molded body according to the twelfth or thirteenth aspect.

  According to the invention of the fourteenth aspect, since the resin molded body according to the twelfth or thirteenth aspect is provided, a resin product having an elastic tape, an elastic string, and the like can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the resin composition which has favorable ultrasonic adhesiveness with a wider range of nonwoven fabric, the molded object of this resin composition, and the resin product which has this molded object can be provided.

  Next, the best mode for carrying out the present invention will be described.

  The resin composition of the present invention contains a polyurethane resin and a resin obtained by copolymerizing at least an olefin and a vinyl monomer having a polar group. In addition, it is preferable that content of a polyurethane resin is 30 to 85 weight part, and content of copolymerized resin is 10 to 50 weight part. The polyurethane resin has low ultrasonic adhesiveness with a nonwoven fabric made of polypropylene or the like, which is considered to be due to low compatibility between the two resins. Therefore, by forming a resin composition containing a resin obtained by copolymerizing a vinyl monomer having a polar group having good compatibility with an olefin and polyurethane resin having good compatibility with a nonwoven fabric made of polypropylene, etc. The ultrasonic adhesiveness with a wide range of nonwoven fabrics becomes good. Here, as an advantage of the ultrasonic adhesiveness of the resin composition being good, since it is not cured when the resin composition is bonded, the bonded resin composition is easy to recycle and the resin composition is bonded. It is possible to reduce the cost to be generated. Specific examples of the recycling include batch melting and re-pelletizing a completely plastic supporting member for shape retention, a stretchable tape obtained by molding a resin composition, or a flat mask having an elastic string.

  In view of polymerizability, the olefin used in the present invention is usually an α-olefin, and is preferably one or more olefins selected from the group consisting of ethylene, propylene and 1-butene. Thereby, the compatibility of the copolymerized resin and a wider range of nonwoven fabric can be improved.

The vinyl monomer having a polar group used in the present invention is usually a monomer having an ester group, and is preferably one or more monomers selected from the group consisting of acrylic acid esters, methacrylic acid esters, and vinyl carboxylates. Thereby, the compatibility of copolymerized resin and urethane resin can be improved. Here, the acrylic acid ester has the general formula CH ₂ ═CH—COOC ₁ H _{2l + 1}
In which the methacrylic acid ester has the general formula CH ₂ ═C (CH ₃ ) —COOC _m H _{2m + 1}
The vinyl carboxylate has the general formula CH ₂ ═CH—OCOC _n H _{2n + 1}
It is preferable that l, m, and n are each an integer of 1 or more and 4 or less. When l, m and n are each an integer of 5 or more, the effect of increasing the compatibility between the copolymerized resin and the urethane resin is lowered, which is not preferable.

  The content of the vinyl monomer having a copolymerized polar group in the copolymerized resin used in the present invention is preferably 15% by weight or more and 30% by weight or less. Thereby, the elasticity and blocking resistance of a resin composition can be made compatible. In addition, when this content rate is less than 15 weight%, the elasticity of a resin composition will become inadequate, and when it exceeds 30 weight%, it will become easy to block.

  The resin composition of the present invention preferably further contains an inorganic filler. Thereby, blocking resistance and heat resistance can be improved. Examples of the inorganic filler include talc, calcium carbonate, zeolite, gypsum, carbon black, mica, clay, kaolin, silica, diatomaceous earth and the like, and calcium carbonate is particularly preferable. The inorganic filler preferably has an average particle size of 0.5 μm or more and 5 μm or less, and a surface treated with a fatty acid or the like can also be used.

  These inorganic fillers can be used alone or in combination. Moreover, it is preferable that the addition amount of an inorganic filler is 2 to 20 weight part. When the addition amount is less than 2 parts by weight, the effect of the inorganic filler becomes insufficient, and when it is more than 20 parts by weight, the strength of the resin composition may be lowered.

  The resin composition of the present invention is obtained by adding a hydrogen to an ABA type block copolymer having a polymer block A made of styrene and a polymer block B made of a conjugated diene monomer, and a resin modified with maleic acid. Furthermore, it is preferable to contain. Thereby, the dispersibility of the inorganic filler in a resin composition can be improved. The maleic acid-modified resin means a resin grafted with maleic anhydride, and the grafting method includes a method of melt-kneading the resin with a radical initiator and maleic anhydride using an extruder or the like. Can be mentioned. Here, the conjugated diene monomer is preferably at least one of butadiene and isoprene. Specifically, living anionic polymerization using styrene and butadiene (or isoprene) is performed to produce poly (styrene-b-butadiene-b-styrene) (or poly (styrene) as an ABA type block copolymer. Styrene-b-isoprene-b-styrene)). Furthermore, by adding hydrogen to the ABA type block copolymer and modifying it with maleic acid, maleic acid-modified poly [styrene-b- (ethylene-co-butylene) -b-styrene] (hereinafter referred to as maleic). Acid-modified SEBS) (or maleic acid-modified poly [styrene-b- (ethylene-co-propylene) -b-styrene]). The content of the resin modified with maleic acid is preferably 1 part by weight or more and 10 parts by weight or less. If the content is less than 1 part by weight, the molded product may become cloudy during stretching due to poor dispersion of the inorganic filler. If it is larger than 10 parts by weight, the strength and heat resistance of the resin composition may be lowered.

  In the present invention, a heat stabilizer, an ultraviolet absorber, an antistatic agent, an antioxidant, a colorant and the like can be appropriately blended with the resin composition.

  The resin composition of the present invention may be used in a state where the raw material composition is dry blended using a Henschel mixer, a high speed mixer or the like. Further, the resin composition may be used in a state in which the dry blended raw material composition is melt kneaded and extruded using an extruder or the like while being heated at 180 ° C. or higher and 230 ° C. or lower and pelletized.

  The molded article of the present invention is molded from the above resin composition. Thereby, the molded object with favorable thermal adhesiveness and ultrasonic adhesiveness with a wider range of nonwoven fabric can be provided. Examples of such a molded body include a stretchable film, a stretchable tape, and an elastic string.

  In order to produce a stretchable film by molding a resin composition, it is possible to mold using a T-die extruder, but considering the strength balance between the length and width of the film, high-speed moldability, etc. It is preferable to use an air-cooled inflation molding method for molding a tubular film. The air-cooled inflation molding is preferably performed at a resin temperature of 180 ° C. or higher and 220 ° C. or lower and a blow ratio of 1.5 or higher and 5 or lower. At this time, the thickness of the stretchable film is appropriately selected depending on various applications, but is usually preferably 200 μm or less, and more preferably 30 μm or more and 150 μm or less. If the thickness of the stretchable film is larger than 200 μm, there is a possibility that the film formation stability of the film may be hindered, which is not preferable. In addition, it can be set as a stretchable tape by cutting a stretchable film into the width | variety of about 15 mm or more and about 60 mm or less, and making it a roll wound product, or hanging down as it is to a receiving box. Further, the roll wound product is further cut into a narrow width of 1 mm or more and 15 mm or less to form a traverse wound product, or it is dropped into a receiving box as it is, so that a stretchable narrow tape can be obtained.

  It is preferable that the molded body of the present invention is further annealed in a stretched state. Thereby, the stretch distortion under a low stress can be reduced and the stretchability can be improved. When stretching the stretchable tape, the stretching direction may be any of the longitudinal uniaxial direction (MD), the lateral uniaxial direction (TD), and the longitudinal and lateral biaxial directions. Although the draw ratio is arbitrary, it is usually about 1.5 to 6 times in any direction, and preferably 1.5 to 3.5 times. The stretchable tape may be stretched under heating. Next, when the stretched elastic tape is annealed, it is preferably performed at a temperature equal to or higher than the temperature at the time of stretching, specifically, at a normal temperature or higher and 90 ° C. or lower. At this time, the annealing may be performed using either a high-temperature roll or a hot water bath.

  Furthermore, in this invention, an elastic string can be obtained by extending | stretching and annealing an elastic tape, or cutting after extending | stretching after cutting an elastic tape, and annealing. The width of the elastic string is usually 1 mm or more and 15 mm or less, and preferably about 1.5 mm or more and 10 mm or less. The stretchable tape is stretched in the longitudinal uniaxial direction (MD), and the stretch ratio is arbitrary, but is usually about 1.5 to 6 times, and about 1.5 to 3.5 times. preferable. The stretching may be performed under heating. Annealing can be performed in the same manner as described above.

  In the resin product of the present invention, the above molded product is bonded. Specifically, a waist gather of paper diapers obtained by thermally bonding or ultrasonically bonding a non-woven fabric, a woven fabric, a plastic film, a plastic sheet or a laminate thereof with the stretchable tape stretched and relaxing the tape stretch Examples include a non-woven fabric simple mask for semiconductor production obtained by ultrasonically bonding an elastic string to a non-woven fabric, such as gathers in the wing portion of a sanitary napkin, a base material for a compress.

All parts in this example are parts by weight, and this example is merely illustrative of the present invention, and the present invention is not limited by these examples.
Example 1
70 parts of thermoplastic polyurethane resin Rezamin P-6185 (manufactured by Dainichi Seika Kogyo Co., Ltd.), ethylene-methyl acrylate copolymer OPTEMA TC-110 (Made by ExxonMobil Chemical Co.) having a methyl acrylate content of 21.5% by weight From 25 parts of masterbatch consisting of 30% by weight of 70% by weight of calcium carbonate PO filler 150B fatty acid treated product (manufactured by Shiraishi Calcium Co., Ltd.) having an average particle size of 3.2 μm and 5 parts of maleic acid-modified SEBS Tuftec M1913 (manufactured by Asahi Kasei) A film having a folding diameter of 600 mm and a thickness of 100 μm was produced from the mixed raw material using an air-cooled inflation film forming apparatus. At this time, about Rezamin P-6185, what was previously dried at 85 degreeC for 24 hours using the challenger dehumidification dryer (made by Kawata Corp.) was used. Extrusion was carried out with a 55 mm diameter extruder YEI-55HDR-W130S-LRW (manufactured by Yoshii Tekko Co., Ltd.) using a 150 mm diameter spiral die and a screw having an effective length of 26 with full-flight single type tip mixing. . Extrusion conditions are as follows: C1, C2, C3, H, D1 and D2 temperatures of 195 ° C., 215 ° C., 220 ° C., 220 ° C., 221 ° C. and 220 ° C., screw rotation speed of 40 rpm to 70 rpm, extrusion amount Of 35 kg / hour or more and 65 kg / hour or less. The film forming conditions were a width of 600 mm and a take-up speed of 4 m / min to 20 m / min. After cutting both ears of the film, the film was divided into two sheets and wound into a sheet to produce a stretchable film having a width of 500 mm.

  Next, the elastic film was cut into a width of 40 mm using a rotary blade type good slitter 531K (manufactured by Gordo Kiko Co., Ltd.). An elastic tape having a width of 40 mm was produced.

Furthermore, the elastic tape is cut and wound with a traverse winder BTW type (manufactured by Shinwa Iron Works Co., Ltd.) using a leather blade as a slit blade, and has a thickness of 100 μm, a width of 4.5 mm, and a linear density of 0.52 g / m. A tape was prepared.
(Example 2)
Using a mixed raw material consisting of 50 parts of Rezamin P-6185, 45 parts of masterbatch and 5 parts of Tuftec M1913, it was processed in the same manner as in Example 1 and was 100 μm thick, 4.5 mm wide, and 0.51 g / m in linear density. An elastic tape was prepared.
(Example 3)
Using a mixed raw material consisting of 30 parts of Rezamin P-6185, 65 parts of masterbatch and 5 parts of Tuftec M1913, it was processed in the same manner as in Example 1 and was 100 μm thick, 4.5 mm wide, and 0.5 g / m linear density. An elastic tape was prepared.
Example 4
Using the same mixed raw material as in Example 1, it was processed in the same manner to produce an elastic tape having a thickness of 145 μm and a width of 60 mm. Further, by cutting with a traverse winder BTW type, an elastic tape having a thickness of 145 μm, a width of 6 mm, and a linear density of 0.93 g / m was produced and hung in a cardboard box.
(Example 5)
After processing in the same manner as in Example 1 and stretching the obtained elastic tape having a thickness of 100 μm, a width of 4.5 mm, and a linear density of 0.52 g / m at room temperature, it was annealed in a 50 ° C. water bath, An elastic string having a thickness of 100 μm, a width of 4.5 mm, and a linear density of 0.45 g / m was produced by hanging on a cardboard box with a roll at room temperature.
(Example 6)
Using the same mixed raw material as in Example 1, it was processed in the same manner to produce an elastic tape having a thickness of 100 μm and a width of 20 mm. Furthermore, an elastic tape having a thickness of 100 μm and a width of 2 mm was produced by cutting with a traverse winder BTW type. The resulting stretchable tape was stretched twice at room temperature, then annealed in a 50 ° C. water bath, suspended in a cardboard box with a roll at room temperature, and elastic having a thickness of 100 μm, a width of 2 mm, and a linear density of 0.2 g / m. A string was made.
(Example 7)
Using the same mixed raw material as in Example 1, it was processed in the same manner to produce an elastic tape having a thickness of 100 μm and a width of 50 mm. Furthermore, an elastic tape having a thickness of 100 μm and a width of 10 mm was produced by cutting with a traverse winder BTW type. The resulting elastic tape was folded at the center to make the width 5 mm, and then stretched twice in air at room temperature. When the tension of the elastic tape was released, a residual strain of about 12% was generated. This stretchable tape was stretched twice again and both ends were fixed with cello tape (registered trademark). In this state, it was immersed in 70 ° C. water for 1 second and annealed, and then cooled in normal temperature water to produce an elastic string having a thickness of 100 μm, a width of 5 mm, and a linear density of 0.52 g / m.
(Comparative Example 1)
Mobilon (Nisshinbo Co., Ltd.) having a thickness of 160 μm, a width of 4 mm, and a linear density of 0.67 g / m was used as the elastic tape made of polyurethane. Mobilon is not stretched.
(Comparative Example 2)
As the elastic tape made of polyurethane, Mobilon having a thickness of 180 μm, a width of 5 mm, and a linear density of 1.8 g / m was used.
(Comparative Example 3)
As an elastic yarn made of polyurethane, an operon (manufactured by Toray DuPont) having a linear density of 0.122 g / m was used. The operon has been stretched.
(Evaluation method and evaluation results)
Stretching is done by using a tensile tester RTA-100 (Orientec Co., Ltd.) compatible with JIS-L1096 to stretch and contract stretchable tape, elastic string and elastic thread in the longitudinal uniaxial direction (MD) and 100 mm between chucks. Evaluation was made by drawing a stress-strain curve by turning back at the time of 100% elongation at a chuck speed of 300 mm / min, and the results are shown in Table 1.

なお、表中、行きとは、１００％伸長する前の過程を意味し、戻りとは、１００％伸長した後の過程を意味し、伸縮歪みとは、戻りで応力が０になる時点での歪みを意味する。また、表１には、評価に用いた伸縮性テープ、弾性紐及び弾性糸の厚さ、幅及び線密度を掲載した。表１の応力及び伸縮歪みの値から、実施例１乃至４の伸縮性テープ及び実施例５乃至７の弾性紐は、実用上、問題の無い伸縮性を有することがわかった。

In the table, “going” means a process before 100% elongation, “return” means a process after 100% elongation, and “stretching strain” means a point at which the stress becomes zero upon return. Means distortion. Table 1 lists the thickness, width, and linear density of the elastic tape, elastic string, and elastic yarn used in the evaluation. From the values of stress and stretching strain in Table 1, it was found that the stretchable tapes of Examples 1 to 4 and the elastic strings of Examples 5 to 7 have practically no problem stretchability.

  Further, the tensile strength and elongation of the stretchable tape, the elastic string, and the elastic yarn were evaluated in the same manner as described above except that the distance between the chucks was 50 mm, and the results are shown in Table 2.

表２の破断強度及び破断時の歪みの値から、実施例１乃至４の伸縮性テープ及び実施例５乃至７の弾性紐は、実用上、問題の無い引張強伸度を有することがわかった。

From the values of the breaking strength and the strain at break in Table 2, it was found that the elastic tapes of Examples 1 to 4 and the elastic strings of Examples 5 to 7 had practically no problem tensile strength and elongation. .

Ultrasonic adhesiveness is confirmed by actually wearing a simple mask for semiconductor manufacturing in which an elastic string is ultrasonically bonded to a non-woven fabric, ◎ if there is no occurrence of cutting and peeling at all, ○ The case where it occurred and the case where it did not occur was evaluated as Δ, and the case where it occurred was evaluated as ×. For ultrasonic bonding, a manual type ultrasonic sealing machine HW35 (manufactured by Swiss Rinco) was used. / Cm ² , and the condition that the gap between the horn and the base is 0.2 mm or less. The simple mask for semiconductor production used here has a three-layer structure, and the innermost nonwoven fabric to be ultrasonically bonded is a polypropylene spunbond (commercial product) having an area density of 18 g / m ² . In addition, in the ultrasonic bonding portion of the innermost layer, the ultrasonic adhesiveness is evaluated with three types of simple masks for manufacturing semiconductors in which a nonwoven fabric made of nylon, a nonwoven fabric made of polyester, and a nonwoven fabric made of polypropylene are used, The results are shown in Table 3.

これより、比較例１及び２の伸縮性テープで困難であったポリプロピレン不織布との超音波接着が実施例１乃至４の伸縮性テープで可能となり、比較例３の弾性糸で困難であったナイロン不織布、ポリエステル不織布及びポリプロピレン不織布との超音波接着が実施例５乃至７の弾性紐で可能となったことがわかった。また、プラスチック製の形状保持部材を備え、実施例１乃至４の伸縮性テープ及び実施例５乃至７の弾性紐をポリプロピレン製の不織布に超音波接着させた簡易マスクは、従来のポリウレタンテープをポリプロピレン製の不織布に接着させた簡易マスクでは困難であったマスク全部材の一括リサイクルが可能であった。

Thus, ultrasonic bonding with the polypropylene nonwoven fabric, which was difficult with the elastic tapes of Comparative Examples 1 and 2, became possible with the elastic tapes of Examples 1 to 4, and was difficult with the elastic yarn of Comparative Example 3. It was found that ultrasonic bonding with the nonwoven fabric, polyester nonwoven fabric and polypropylene nonwoven fabric was possible with the elastic cords of Examples 5 to 7. Further, a simple mask comprising a plastic shape holding member and ultrasonically bonding the elastic tapes of Examples 1 to 4 and the elastic strings of Examples 5 to 7 to a nonwoven fabric made of polypropylene is obtained by using a conventional polyurethane tape as a polypropylene. It was possible to batch recycle all mask members, which was difficult with a simple mask adhered to a non-woven fabric.

Claims (14)

  A resin composition comprising a polyurethane resin and a resin obtained by copolymerizing at least an olefin and a vinyl monomer having a polar group. The content of the polyurethane resin is 30 parts by weight or more and 85 parts by weight or less,
The resin composition according to claim 1, wherein the content of the copolymerized resin is 10 parts by weight or more and 50 parts by weight or less.   The resin composition according to claim 1, wherein the olefin is one or more olefins selected from the group consisting of ethylene, propylene, and 1-butene.   The vinyl monomer having a polar group is one or more monomers selected from the group consisting of acrylic acid esters, methacrylic acid esters, and vinyl carboxylates, according to any one of claims 1 to 3. Resin composition. The acrylic ester has the general formula CH ₂ ═CH—COOC ₁ H _{2l + 1}
A compound represented by
The methacrylic acid ester has the general formula CH ₂ ═C (CH ₃ ) —COOC _m H _{2m + 1}
A compound represented by
The vinyl carboxylate has the general formula CH ₂ ═CH—OCOC _n H _{2n + 1}
The resin composition according to claim 4, wherein l, m, and n are each an integer of 1 or more and 4 or less.   The content of the copolymerized vinyl monomer having the polar group in the copolymerized resin is 15 wt% or more and 30 wt% or less, according to any one of claims 1 to 5. The resin composition as described.   The resin composition according to claim 1, further comprising an inorganic filler.   The resin composition according to claim 7, wherein the content of the inorganic filler is 2 parts by weight or more and 20 parts by weight or less.   The resin further comprises a maleic acid-modified resin obtained by adding hydrogen to an ABA type block copolymer having a polymer block A made of styrene and a polymer block B made of a conjugated diene monomer. The resin composition according to claim 1.   The resin composition according to claim 9, wherein the conjugated diene monomer is at least one of butadiene and isoprene.   11. The resin composition according to claim 9, wherein the content of the maleic acid-modified resin is 1 part by weight or more and 10 parts by weight or less.   A molded body, wherein the resin composition according to any one of claims 1 to 11 is molded.   Furthermore, it anneals in the extended state, The molded object of Claim 12 characterized by the above-mentioned. A resin product comprising the molded article according to claim 12 or 13.