JP2005323690A - Outsole and shoes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outsole and shoes which are light in weight and excellent in a slip proof property and wear resistance. <P>SOLUTION: This outsole 1 comprises a laminated part 15 provided with a grounding layer 17 and a non-grounding layer 19 and composed of a polymer composition practically not including air bubbles. The area ratio of the laminated part 15 is ≥50%, the specific gravity of the grounding layer 17 is ≥1.00 and <1.10, the grounding layer 17 includes NBR and VCR as a base polymer, the ratio of the total amount to the entire base polymer is ≥60 mass %, and the mass ratio of the NBR and the VCR is ≥30/70 and ≤70/30. The specific gravity of the non-grounding layer 19 is ≥0.80 and <1.00, the non-grounding layer 19 includes the VCR and IR as the base polymer, the ratio of the total amount of the VCR and the IR occupying the entire base polymer is ≥60 mass %, and the mass ratio of the VCR and the IR is ≥20/80 and ≤80/20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to an outsole and a shoe including the outsole.

  The shoe is composed of an outsole, an upper, an insole and the like. The outsole is usually formed from a rubber-based composition. The outsole needs to grip the ground during exercise with landing and kicking. In particular, wet grip is important because it is slippery on wet ground.

  It is also important that the outsole be lightweight. The weight of the outsole affects the weight of the shoe. Light shoes are suitable for exercise and comfortable. JP-A-2-149206 discloses an outsole containing bubbles. This outsole is lightweight because it contains air bubbles, and also has an instantaneous stop and slip resistance. However, the wear resistance of the outsole is insufficient due to the inclusion of bubbles. Even if the above grip properties are good, if the wear is large, the value of the shoe is low. Wear resistance is also important for shoes. In order to maintain wear resistance, it is necessary to use a material that does not contain bubbles.

Various soles have been proposed from the viewpoint of achieving both wear resistance and light weight. For example, Japanese Patent Application Laid-Open No. 4-276204 discloses a sole having a main body made of synthetic leather and a protrusion bonded to the main body. The protrusion is made of a synthetic resin. A sole using synthetic leather is inferior in stability.
JP-A-2-149206 JP-A-4-276204

  An object of the present invention is to provide an outsole that is lightweight and has excellent grip and wear resistance.

The outsole according to the present invention is
(1) It is provided with a laminated portion made of a polymer composition that includes a grounding layer and a non-grounding layer and substantially does not contain bubbles,
(2) The area ratio of the laminated portion is 50% or more,
(3) The specific gravity of the ground layer is 1.00 or more and less than 1.10.
(4) This grounding layer contains NBR and VCR as base polymers,
(5) In this ground contact layer, the ratio of the total amount of NBR and VCR to the total base polymer is 60% by mass or more,
(6) In this ground contact layer, the mass ratio of NBR and VCR is 30/70 or more and 70/30 or less,
(7) The specific gravity of the non-grounding layer is 0.80 or more and less than 1.00,
(8) This non-grounding layer contains VCR and IR as a base polymer,
(9) In this non-grounding layer, the ratio of the total amount of VCR and IR to the total base polymer is 60% by mass or more,
(10) In this non-ground layer, the mass ratio of VCR to IR is 20/80 or more and 80/20 or less.

  Preferably, the mass ratio of NBR to VCR in the ground layer is 40/60 or more and 60/40 or less.

  More preferably, the amount of NBR bonded acrylonitrile in the ground layer is 25% or more and 43% or less.

  A shoe according to the present invention includes the outsole described above.

  In this outsole, since the base polymer for forming the grounding layer contains NBR, it is excellent in slip resistance. Since this ground layer includes a VCR, the strength is improved and the weight is reduced. The non-ground layer includes a VCR that increases strength and an IR that increases elongation. The outsole is excellent in anti-slip property and lightweight due to the laminated portion in which the ground layer and the non-ground layer are laminated.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a partially cutaway front view showing a shoe 1 according to an embodiment of the present invention, and FIG. 2 is a bottom view thereof. The shoe 1 includes an upper 3, a midsole 5, and an outsole 7. Although not shown, the shoe 1 also includes an insole. The outsole 7 includes a main body 9 and a large number of protrusions 11. The protrusion 11 protrudes downward from the main body 9. The protrusion 11 is formed integrally with the main body 9. Here, “integral molding” means a state in which the main body 9 and the protrusion 11 are bonded at the molecular level. This protrusion 11 is useful for anti-slip.

  FIG. 3 is a cross-sectional view taken along line III-III in FIG. The outsole 7 includes a laminated portion 15 made of a polymer composition that does not substantially contain bubbles. In other words, the outsole 7 is made of so-called solid rubber. The outsole 7 made of solid rubber is excellent in wear resistance and stability. In the present invention, the term “bubbles” means those intentionally introduced by means such as foaming of a chemical foaming agent and blending of fine hollow spheres.

  The laminated portion 15 includes a ground layer 17 and a non-ground layer 19. The outsole 7 is provided with wet grip properties that prevent slippage on the wet surface by the laminated portion 15. This wet grip property is due to the effect of the ground layer 17 described next. The laminated portion 15 does not have a large specific gravity. Therefore, the outsole 7 has high wet grip properties but is not heavy and has excellent durability.

   The grounding layer 17 includes NBR and VCR in the base polymer. “NBR” means acrylonitrile-butadiene rubber. This NBR has the effect of increasing the wet grip performance of the outsole. NBR has a specific gravity of about 0.97 to 1.00, and has a large specific gravity as a polymer. When the NBR ratio increases, the ground layer 17 becomes heavier and the strength decreases, so that the NBR ratio is limited to a certain range. Among NBRs, those having an amount of bound acrylonitrile (abbreviated as AN) in NBR of 25% or more and 43% or less are preferable because of excellent wet grip properties. More preferably, NBR has a bound acrylonitrile amount in NBR of 31% or more and 36% or less.

“VCR” means a rubber in which a high cis polybutadiene and a high crystalline syndiotactic polybutadiene are combined. Use of a VCR improves strength. The amount of reinforcing inorganic filler can be reduced by the effect of using the VCR. In addition, the specific gravity of the VCR is as small as about 0.91. The use of this VCR having a low specific gravity contributes to the lightness of the outsole 7. Among VCRs, a VCR having a syndiotactic polybutadiene amount of 10% by mass or more, and more preferably 15% by mass or more is preferable from the viewpoint of strength. From the viewpoint of wear resistance, a VCR having a syndiotactic polybutadiene (abbreviated as SPB) amount of 20% by mass or less, more preferably 18% by mass or less is preferable.

  In the combination of NBR and VCR, VCR increases hardness and decreases specific gravity. On the other hand, when the VCR ratio increases, the wet grip performance decreases. The ratio between the NBR and the VCR needs to be 30/70 or more in order to keep the wet grip property good. More preferably, the ratio of NBR to VCR is 40/60 or more. From the standpoint of maintaining the strength and light weight of the outsole, the ratio of NBR to VCR is 70/30 or less. More preferably, it is 60/40. When NBR / VCR is in the above range, the balance between physical properties and weight is excellent.

  The total amount of NBR and VCR in the grounding layer 17 is 60% by mass or more in the total base polymer. If this total amount is less than 60% by mass, the effects of wet grip and light weight cannot be obtained. The total amount is preferably 70% by mass or more, and more preferably 80% by mass or more.

  As described above, the base polymer of the ground layer 17 may include a polymer other than NBR and VCR. Examples of other polymers include styrene-butadiene rubber, butadiene rubber, butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-vinyl acetate copolymer, nitrile-isoprene rubber, chloroprene rubber, urethane rubber and natural rubber. Is done. Since the ground layer 17 is a portion that slides directly on the ground, it is necessary to have excellent wear resistance.

  Since the ethylene-propylene-diene rubber has a small specific gravity, blending it is preferable in terms of contributing to weight reduction. However, this rubber is limited to 35% by mass or less when used because it reduces the wear resistance. Of these, butadiene rubber, isoprene rubber, styrene-butadiene rubber, and natural rubber are suitable for the grounding layer 17 as the other base polymer from the viewpoint of maintaining the good wear resistance.

  In order to improve the wear resistance, means such as improvement of the crosslinking density, blending of a small diameter filler and the like may be used. Although it can be reduced by the VCR, a filler is added to the rubber composition of the ground layer 17 in order to increase the hardness. Generally, carbon black or silica as an inorganic filler is blended as a reinforcing agent. These carbon black and silica have a higher specific gravity than the polymer. In order to obtain a lightweight outsole, it is necessary to obtain the necessary physical properties while keeping the blending amount of the filler low. For this purpose, the compounding amount of the reinforcing filler is preferably 30 parts by mass or less, particularly 25 parts by mass or less with respect to 100 parts by mass of the base rubber.

  In order to provide appropriate hardness without increasing the specific gravity of the ground layer 17, it is preferable to use a resin filler together. The effect of the inorganic filler can be supplemented by blending the ground layer 17 with a resin filler. By using a resin filler, the amount of carbon black and silica is reduced. Since the resin filler has a low specific gravity, the use of the resin filler contributes to the weight reduction of the outsole 7. A resin filler having a specific gravity of 1.05 or less, more preferably 1.00 or less, further 0.95 or less, and further 0.91 or less is particularly preferable.

  Specific examples of preferred resin fillers include syndiotactic 1,2-polybutadiene and high styrene resin. Syndiotactic 1,2-polybutadiene is particularly preferred from the viewpoint of low specific gravity. The high styrene resin is a styrene-butadiene copolymer having a styrene resin content of 60% by mass or more. The syndiotactic 1,2-polybutadiene is a resin containing 90% or more of 1,2-bond vinyl component in the microstructure and the remaining component being cis 1,4-bond or trans 1,4-bond.

  The blending amount of the resin filler is preferably 20 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of the base rubber. If the amount is less than 20 parts by mass, the hardness tends to be insufficient. From the viewpoint of maintaining appropriate hardness, the amount of the resin filler is more preferably 25 parts by mass or more. More preferably, it is 30 parts by mass or more. Moreover, when the compounding quantity of a resin filler exceeds 40 mass parts, abrasion resistance will fall easily. In this respect, the amount of the resin filler is more preferably 35 parts by mass or less.

  The rubber composition for the ground layer 17 can be applied with sulfur crosslinking, peroxide crosslinking, or the like. In addition to this rubber composition, an appropriate amount of a softening agent, a silylating agent, a silane coupling agent, an anti-aging agent, a vulcanization accelerator, a crosslinking aid, a colorant and the like are added as necessary.

  From the viewpoint of maintaining physical properties and reducing the weight, the specific gravity of the ground layer 17 needs to be 1.00 or more. When the specific gravity is less than 1.00, strength and wear resistance are insufficient. From the viewpoint of this characteristic, the specific gravity of the ground layer 17 is more preferably 1.03 or more. On the other hand, if the specific gravity of the ground layer 17 is excessive, it is impaired that the shoe 1 is lightweight. From the viewpoint of reducing the weight, the ground layer 17 needs to have a specific gravity of 1.10 or less. Further, the specific gravity of the ground layer 17 is preferably 1.08 or less.

  As part of the evaluation of each polymer composition, the physical properties of the crosslinked sample are usually measured. In the present invention, the hardness is measured with a durometer hardness type A in accordance with JIS-K-6253 using a plate-shaped test piece having a thickness of 12 mm. If the hardness is too low, the wear resistance deteriorates particularly when the inorganic filler is reduced to reduce the hardness. The higher the hardness, the better the wear resistance, but the elongation tends to be small or brittle. In general, when both hardness and elongation are increased while maintaining wear resistance, the specific gravity increases. The abrasion resistance is measured in accordance with the “A-2 method” of the Akron abrasion test specified in JIS-K-6264. In this wear amount measurement, the thickness of the wear wheel is 25 mm, the inclination angle between the test piece and the wear wheel is 15 °, the load applied to the wear wheel is 44.1 N, and the rotation speed of the test piece is 250 rpm. These results are shown in Tables 1 and 2 below.

  As shown in FIG. 3, the grounding layer 17 includes a protrusion 11 and has a layer thickness along the surface of the outsole 7. The thickness of the ground layer 17 in the laminated portion 15 is preferably 1 mm or more at the main body and the protrusion. More preferably, it is 1.5 mm or more. However, if the ground layer 17 is too thick, the non-ground layer 19 becomes thin. If the non-grounding layer 19 is too thin, the outsole 7 becomes hard and the comfort becomes worse, and the weight of the outsole 7 tends to increase. From this viewpoint, the thickness of the ground layer is preferably 5 mm or less, and more preferably 4 mm or less. The thickness of the ground contact layer may be changed in the outsole and distributed with priority. For example, the thickness of the grounding layer may be increased at the protruding portion where wear resistance and grip properties are particularly required, and the main body portion may be decreased. Furthermore, the thickness of the grounding layer may be made different between the protrusion near the periphery of the outsole and the protrusion at the center. For the above reason, the volume ratio of the grounding layer 17 occupying the laminated portion is preferably 10% or more and 80% or less.

  The non-grounding layer 19 is a part that supports the grounding layer 17 by receiving the load and impact of human movement. The non-grounding layer 19 is required to be integrated with the grounding layer 17 in addition to the above strength, hardness and flexibility. VCR and IR are included as the base polymer of the non-grounding layer 19. This “IR” means polyisoprene rubber. As described above, the VCR increases the strength and hardness, so that the blending amount of the filler can be reduced. By adding IR, the hardness by VCR is relieved and the elongation of the non-ground layer 19 is improved.

  In this non-grounding layer 19, the mass ratio of VCR and IR needs to be 20/80 or more from the viewpoint of strength and hardness. More preferably, the mass ratio of VCR to IR is 30/70, and further 60/40. Conversely, if this ratio is excessive, the flexibility of the non-grounding layer 19 is insufficient. Insufficient flexibility impairs the impact mitigation of the shoe during exercise. For this reason, the mass ratio between VCR and IR needs to be 80/20 or less. The mass ratio of VCR and IR is more preferably 70/30, still more preferably 60/40. If it is mass ratio of this range, the balance of the said physical property is favorable. In the non-grounding layer 19, the ratio of the total amount of VCR and IR to the total base polymer is 60% by mass or more. When this ratio is less than 60% by mass, the sufficient role and effect of the non-grounding layer 19 cannot be obtained. The ratio of the total amount of VCR and IR to the total base polymer is preferably 70% by mass or more. More preferably, this ratio is 80% by mass or more.

  The non-grounding layer 19 may contain a polymer other than VCR and IR as the base polymer as described above. From these viewpoints, rubbers used in addition to VCR and IR include styrene-butadiene rubber, butadiene rubber, butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-vinyl acetate copolymer, nitrile-isoprene rubber, Examples include chloroprene rubber, urethane rubber and natural rubber. Among these, ethylene-propylene-diene rubber tends to lower the adhesiveness with the grounding layer 17, and therefore when used, it is limited to less than 40 parts by mass. From the viewpoint of light weight, it is preferable that the rubber used in addition to the above has a specific gravity of 0.95 or less, particularly 0.93 or less. An example is butadiene rubber.

  A low specific gravity rubber composition is used for the non-grounding layer 19. The shoe 1 provided with the non-grounding layer 19 is lightweight. From the viewpoint of light weight, the specific gravity of the non-ground layer 19 is preferably 1.00 or less, more preferably 0.98 or less, and particularly preferably 0.95 or less. From the viewpoint of strength and stability, the specific gravity is preferably 0.70 or more, more preferably 0.80 or more, and particularly preferably 0.90 or more.

  The non-grounding layer 19 does not require high wear resistance because the abrasion resistance is not so necessary as required for the grounding layer. The non-grounding layer 19 is preferably not mixed with carbon black and silica, which are inorganic fillers, from the viewpoint of light weight. Even when carbon black or silica is blended, the amount is preferably small. Specifically, when carbon black and silica are added, the total amount is preferably 10 parts by mass or less.

  Sulfur crosslinking is mainly applied to the rubber composition of the non-ground layer 19. An appropriate amount of a softening agent, a silylating agent, a silane coupling agent, an antiaging agent, a vulcanization accelerator, a crosslinking aid, a coloring agent, and the like is added to the non-grounding layer 19 as necessary.

  If the thickness of the non-grounding layer 19 is too thin, the above-mentioned role cannot be played. On the other hand, if the thickness of the non-grounding layer is too thick, the thickness of the grounding layer becomes thin and the wear resistance decreases. From these viewpoints, the thickness of the non-grounding layer is preferably 10% or more and 90% or less of the thickness of the laminated portion 15. The thickness of the non-grounding layer 19 can also be distributed partially different in accordance with the case of the grounding layer.

  In manufacturing the outsole 7, a mold is first prepared. In the cavity of this mold, the portion where the protrusion is formed has a recess. The polymer composition for the grounding layer 17 is filled in a portion including the recessed portion where the grounding layer 17 is formed. This polymer composition is pressed by a plate along the cavity mold. The preformed ground layer 17 is filled with the polymer composition for the non-ground layer 19. The upper mold descends to the lower mold filled with these polymer compositions, and is pressed and heated. By this heating, the polymers of the grounding layer 17 and the non-grounding layer 19 cause a crosslinking reaction, whereby the laminated portion 15 is formed and the outsole 7 is obtained.

  FIG. 4 is a cross-sectional view illustrating an outsole 23 according to another embodiment of the present invention. The outsole 23 is also made of a polymer that does not substantially contain bubbles, and includes a main body 25 and a protrusion 27. As shown in this figure, the laminated portion 29 is disposed so as to occupy a region from the toe of the outsole 23 to the center portion of the arch. The laminated portion 29 is composed of a ground layer 31 and a non-ground layer 33, which are composed of the same composition as that of the ground layer 17 and the non-ground layer 19. Therefore, the laminated portion 29 has both wet grip properties and light weight.

  FIG. 5 is a bottom view showing the outsole 23 of FIG. In this figure, the laminated portion 29 is indicated by a hatched portion. The bottom surface of the outsole does not need to be uniform, and a non-laminate portion 35 in consideration of the characteristics of the polymer composition may be provided. In the outsole 23, the non-stacked portion 35 is continuously disposed behind the buttocks side of the stacked portion 29. In order to obtain the above-described effect of the laminated portion 29, the area ratio of the laminated portion 29 to the bottom surface 31 of the outsole 23 needs to be 50% or more. More preferably, the area ratio of the laminated portion 29 is 60% or more, and further 70% or more. The area ratio of the laminated portion 29 is the planar projected area of the laminated portion 29 occupying the planar projected area of the outsole 23.

  FIG. 6A is a bottom view showing an outsole 39 according to still another embodiment of the present invention. FIG. 6B is a cross-sectional view taken along the line BB in FIG. The outsole 39 also includes a laminated portion 41 made of a polymer that does not substantially contain bubbles. The laminated portion 41 is also composed of a ground layer 43 and a non-ground layer 45, which are composed of the same composition as that of the ground layer 17 and the non-ground layer 19. As shown in this figure, the outsole 39 has an island-shaped non-stacked portion 47 disposed at the center. For example, in order to improve the flexibility of this portion, the non-laminated portion 47 can be formed only from the polymer composition for the non-ground layer. The outsole 39 also achieves both wet grip and light weight.

  FIG. 7A is a bottom view showing an outsole 51 according to still another embodiment of the present invention. FIG.7 (b) is sectional drawing along the BB line of Fig.7 (a). The outsole 51 also includes a laminated portion 53 made of a polymer that does not substantially contain bubbles. The laminated portion 53 is composed of a ground layer 55 and a non-ground layer 57, and these are composed of the same composition as that of the ground layer 17 and the non-ground layer 19. As shown in this figure, the outsole 51 has a non-laminated portion 59 disposed in the heel portion. When importance is attached to the wear resistance of this portion, the non-laminated portion 59 can be formed only by the ground layer 55 having high wear resistance. The outsole 51 is also lightweight and is difficult to slip on wet ground.

  FIG. 8 is a cross-sectional view showing an outsole 63 according to still another embodiment of the present invention. The outsole 63 of FIG. 8 also includes a laminated portion 65 made of a polymer that does not substantially contain bubbles. The stacked unit 65 includes a ground layer 67 and a non-ground layer 69. The ground layer 67 and the non-ground layer 69 are also made of the same polymer composition as that of the ground layer 17 and the non-ground layer 19 described above. The specific gravity of each of the ground layer 67 and the non-ground layer 69 is the same as that of the ground layer 17 and the non-ground layer 19 described above. In the laminated portion 65, the non-grounding layer 69 has a substantially constant thickness, and the protrusion 73 below the non-grounding layer 69 and a part of the main body 75 are formed by the grounding layer 69. The area ratio of the bottom surface of the outsole 63 of the laminated portion 65 is 50% or more.

  In the outsole 63, since the entire protrusion 73 is formed of the polymer composition of the ground layer 69, the wear resistance is excellent. Since the thickness of the grounding layer 69 is thinly distributed in the main body 75, the lightness of the outsole is maintained. Locations where the ground layer 69 of the main body 75 is absent and a non-laminated portion is formed may be distributed in the outsole. The shoe using the outsole 63 is not slippery on the wet surface, is lightweight, and lasts a long time.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Preparation of polymer composition]
The compounding agents shown in Table 1 below were kneaded with a closed kneader and an open roll to obtain polymer compositions having compounding numbers X1 to X9 for the ground layer and Y1 to Y8 for the non-ground layer. In Tables 1 and 2, the blending amounts are represented by mass ratios.

Details of the polymers and additives shown in Tables 1 and 2 are as follows.
* 1 NBR (trade name “Nipol DN200” of ZEON Corporation, AN amount: 33.5%)
* 2 NBR (Nippon Zeon's trade name “Nipol DN315”, AN amount: 26.0%)
* 3 VCR (Ube Industries' product name “UBEPOL VCR617”, SPB amount: 17.0%)
* 4 VCR (trade name “UBEPOL VCR412” from Ube Industries, SPB amount: 12.0%)
* 5 Ethylene-propylene rubber (trade name “Esprene 586” by Sumitomo Chemical Co., Ltd.)
* 6 Syndiotactic polybutadiene resin (“RB830” from JSR)
* 7 High styrene resin (Ameripol Synpol's product name “AMERIPOL1904”)
* 8 Silane coupling agent (Degussa "Si69")
* 9 Silica (Degussa's “Ultra Gil VN3”)
* 10 Anti-aging agent (trade name “Sannok N” from Ouchi Shinsei Chemical Co., Ltd.)
* 11 Anti-aging agent (trade name “NOCRACK 200” from Ouchi Shinsei Chemical Co., Ltd.)
* 12 Vulcanization accelerator (Ouchi Shinsei Chemical Co., Ltd. trade name “Noxeller DM”)
* 13 Vulcanization accelerator (trade name “Noxeller TET” by Ouchi Shinsei Chemical Co., Ltd.)
* 14 Vulcanization accelerator (trade name “Noxeller DT” of Ouchi Shinsei Chemical Industry Co., Ltd.)
* 15 Vulcanization accelerator (trade name “Noxeller NS” of Ouchi Shinsei Chemical Co., Ltd.)
* 16 Isoprene rubber ("Nipol IR-2200" from Zeon Corporation)
* 17 Microballoon (Expancel, Japan Philite)

[Example 1]
The same structure as the outsole 7 shown in FIG. 1 to FIG. An outsole was obtained.

[Example 2, Example 3 and Comparative Example 1]
Each outsole was obtained in the same manner as in Example 1 except that the area ratio of the laminated portion in the outsole was as shown in Table 3. In addition, the part which is not a laminated part was formed with the polymer composition for non-grounding layers.

[Example 4 to Example 7 and Comparative Example 2 to Comparative Example 4]
Using X3 for the polymer composition of the grounding layer and each polymer composition shown in Tables 3 and 4 for the non-grounding layer, the area ratio of the laminated portion in the outsole is 90%. The other outsole was obtained by molding in the same manner as in Example 1.

[Examples 8 to 12 and Comparative Examples 5 to 7]
Using Y3 as the polymer composition of the non-grounding layer, and using each of the polymer compositions shown in Tables 4 and 5 as the polymer composition of the grounding layer, the area ratio of the laminated portion in the outsole is 90%. Each outsole was obtained by molding in the same manner as in Example 1 above.

[Comparative Example 8]
Using the polymer composition for the non-grounding layer for the grounding layer and using the polymer for the grounding layer for the non-grounding layer, the area ratio of the laminated portion in the outsole is 90% as in Example 1 above. Each outsole was obtained by molding.

[Comparative Example 9]
An outsole was obtained by molding using a molding die using only the polymer composition X3 for the ground layer without providing a laminated portion.

[Comparative Example 10]
An outsole was obtained by molding using only the polymer composition Y3 for the non-grounding layer without the laminated portion.

[Evaluation]
[Abrasion resistance]
An outsole was placed on the ground made of asphalt concrete, a weight of 10 kg was placed on the outsole, and the outsole was dragged. Thus, the volume of the outsole at the stage where the distance of 50 cm was reciprocated 100 times was measured, and the difference from the volume before dragging was calculated. The results are shown in Tables 3 to 5 below.

[Evaluation of wet grip]
A golf shoe was obtained by attaching a midsole and an upper to the outsole. This golf shoe was worn by a golfer to walk and hit a golf ball on wet grass and on the road surface. Then, with respect to the slipping of the shoes, the non-slipable one was rated as “5”, and the slippery one as “1” was rated in five stages. The average score of 10 golfers is shown in Tables 3-5.

[Stability, flexibility and lightness]
Similarly to the evaluation of the wet grip property, shoes were worn by 10 testers and rated for ease of walking and practicality during exercise. The average values are shown in Tables 3 to 5 by evaluating stability, flexibility and lightness as evaluation items. The larger the numerical value, the higher the stability associated with the exercise, the better the flexibility along the foot, and the lighter the shoe.

  As shown in Tables 3 to 5, the shoes equipped with the outsole of the example have higher evaluation than the shoes equipped with the outsole of the comparative example. From this evaluation result, the superiority of the present invention is clear.

  The present invention can be applied to golf shoes, tennis shoes, walking shoes, jogging shoes, trekking shoes, women's shoes, men's shoes, and the like.

FIG. 1 is a partially cutaway front view showing a shoe according to an embodiment of the present invention. 2 is a bottom view of the shoe of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view illustrating an outsole according to another embodiment of the present invention. FIG. 5 is a bottom view showing an example of the outsole of FIG. FIG. 6 is a bottom view and a cross-sectional view illustrating an outsole according to still another embodiment of the present invention. FIG. 7 is a bottom view and a cross-sectional view illustrating an outsole according to still another embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating an outsole according to still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shoes 3 ... Upper 5 ... Mid sole 7, 23, 39, 51, 63 ... Outsole 9, 25, 75 ... Main body 11, 27, 73 ... Protrusion 15, 29, 41, 53, 65... Laminated parts 17, 31, 43, 55, 67... Ground layer 19, 33, 45, 57, 69... Non-ground layer 35, 47, 59, 71.・ Non-laminated parts

Claims (4)

A layered portion comprising a polymer composition comprising a grounding layer and a non-grounding layer and substantially free of bubbles;
The area ratio of the laminated portion is 50% or more,
The specific gravity of the ground layer is 1.00 or more and less than 1.10,
This grounding layer contains NBR and VCR as base polymers,
In this ground contact layer, the ratio of the total amount of NBR and VCR to the entire base polymer is 60% by mass or more,
In this ground layer, the mass ratio of NBR and VCR is 30/70 or more and 70/30 or less,
The specific gravity of this non-grounding layer is 0.80 or more and less than 1.00,
This non-grounding layer contains VCR and IR as the base polymer,
In this non-grounding layer, the ratio of the total amount of VCR and IR to the whole base polymer is 60% by mass or more,
An outsole having a mass ratio of VCR to IR of 20/80 or more and 80/20 or less in the non-ground layer.   The outsole according to claim 1 whose mass ratio of NBR and VCR in said grounding layer is 40/60 or more and 60/40 or less.   The outsole according to claim 1 or 2, wherein the amount of bonded acrylonitrile of NBR in the grounding layer is 25% or more and 43% or less. A layered portion comprising a polymer composition comprising a grounding layer and a non-grounding layer and substantially free of bubbles;
The area ratio of the laminated portion is 50% or more,
The specific gravity of the ground layer is 1.00 or more and less than 1.10,
This grounding layer contains NBR and VCR as base polymers,
In this ground contact layer, the ratio of the total amount of NBR and VCR to the entire base polymer is 60% by mass or more,
In this ground layer, the mass ratio of NBR and VCR is 30/70 or more and 70/30 or less,
The specific gravity of this non-grounding layer is 0.80 or more and less than 1.00,
This non-grounding layer contains VCR and IR as the base polymer,
In this non-grounding layer, the ratio of the total amount of VCR and IR to the whole base polymer is 60% by mass or more,
A shoe including an outsole in which the mass ratio of VCR to IR is 20/80 or more and 80/20 or less in the non-ground layer.

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