Sportswear and personal protective gear incorporating shear-thickened foam or non-Newtonian foam.

Abstract

The sports bra increases resistance as force increases. The sports bra includes a front curve region for containing a wearer's chest, the front curve region including a shear thickening foam. The shear thickening foam is relatively soft up to a first force and relatively stiffens above the first force to hold the wearer's chest within the front curve region during vigorous physical activity. A back panel is connected to the front curve region, whereby the force is at least partially transferred to the wearer's upper back or shoulder region. The body protection element protects a body part selected from the head, knees, shins, elbows, feet, legs, torso, arms, wrists, or hands from external impact. The body protection element includes a housing that conforms to the shape of the selected body part. The housing includes a shear thickening foam.

Description

[Technical Field]

[0001] Cross-reference with related applications This application was filed in February 2022. 9 We claim priority to U.S. Provisional Patent Application No. 63 / 308,479 filed on [date] and U.S. Provisional Patent Application No. 63 / 355,634 filed on June 27, 2022, the disclosures of which are incorporated herein by reference.

[0002] The present invention relates to body support or body protection gear, clothing and underwear, sportswear and gear, and other special-purpose clothing incorporating a shear-thickened / non-Newtonian foam that exhibits increased resistance when subjected to increased force from the wearer's body or from external forces. [Background technology]

[0003] Shear-thickened materials are materials whose viscosity dramatically increases in response to high-speed shear strain, such as from an external force or the movement of a body part engaged in sports activities. Shear-thickened fluids are also called "non-Newtonian fluids" because they do not exhibit Newtonian behavior, i.e., viscosity independent of the applied stress. Typically, shear-thickened materials are formed as a suspension of particles within a matrix.

[0004] Shear thickening materials have been used in many protective garments and equipment, military bulletproof vests, and sports equipment. However, because shear thickening materials are generally liquid, they are difficult to handle and difficult to house in suitable containers for creating wearable articles.

[0005] For example, in the case of underwear, a bra is worn in direct contact with the wearer's skin. Requirements for materials used to make bras include a soft and comfortable feel against the skin, lightness, and breathability. Flexible polyurethane foam is a soft, porous material with a low modulus of elasticity, low density, and open-cell structure, making it suitable for manufacturing bra cups. Currently, flexible polyurethane foams such as high-rebound and low-rebound foams are widely used in the manufacture of bra cups.

[0006] On the other hand, during sports activities, if the wearer is engaged in high-impact activities, the breasts perform a "butterfly" motion, that is, they move independently up and down. This "butterfly" motion can not only cause pain but also potentially have adverse effects on breast tissue. Therefore, breast support is extremely important in the design of sports bras. Sports bra cups are generally divided into three categories: encapsulation, compression, and combination. Research suggests that women need to wear sports bras with different levels of support depending on the activity. To reduce vertical breast displacement and discomfort caused by exercise, methods have also been proposed that involve placing thick foam pads inside the bra cups of capsule-type sports bras to lift and compress the breasts.

[0007] Commercially available foams, such as flexible polyurethane foam, offer a soft feel but lack the sufficient support required for the vigorous physical movements of sports activities. Therefore, while flexible polyurethane may be suitable for manufacturing everyday bra cups, it is not suitable for sports bra cups, which are intended to eliminate breast movement. The soft feel characteristic of cushioning materials usually means that the material has a low modulus of elasticity, which is inconsistent with the high support characteristics that result from a high modulus of elasticity. To the best of our knowledge, there is no bra foam material that can manufacture bra cups exhibiting a combination of soft feel and sufficient support for vigorous physical movements.

[0008] Roland's U.S. Patent Application Publication 2015 / 0087204 describes clothing incorporating a shape memory material in which, upon reaching a transition temperature, the shape memory material deforms from a first shape to a second shape, the second shape imparting a greater force to the body portion in contact with the clothing than the force imparted to the body portion by the first shape, the transition temperature being between 90°F and 105°F. The disclosed shape memory materials include shape memory alloys and shape memory polymers in which, upon reaching a transition temperature, the shape memory material deforms from a first shape to a second shape, the second shape imparting a greater local support force to the body portion in contact with the clothing compared to the force imparted to the body portion by the first shape. However, in commercially available sports bras, the bra cups are constructed of a laminated or sewn multilayer structure. Their shape is fixed and does not change with room temperature or body temperature. Change from the second shape to the first shape is rarely realized in commercially available bra products.

[0009] Chinese Patent Application Publication No. CN103798978A discloses a shape-memory polymer bra including cups and accessories, characterized in that the cups are made of a shape-memory polymer material and are formed by blister molding of a sheet into cups or by injection molding with a softening point of 45-70°C. The shape-memory polymer is a foamed or non-foamed material. The shape-memory polymer may be cross-linked trans polyisoprene, polyester or polyolefin, or non-cross-linked polyurethane or norbornene. The cups have ventilation holes with a diameter of 1-3 mm, and the total area of ​​the ventilation holes accounts for 10-70% of the total area of ​​the shape-memory polymer. By heating to a softening point of 45-70°C, it is molded to a bust size suitable for the user, enhancing comfort. This invention utilizes the shape-memory function of shape-memory foam, which has a softening temperature of 50-60°C, much higher than body temperature, to change the cup size. However, a mold is required to achieve permanent deformation in order to shape the bra. Furthermore, the softening temperature is much higher than body temperature. The change in shape needs to be caused by external heating. The need for insufficient support cannot be met with the materials of the sports bras that have been disclosed.

[0010] Furthermore, U.S. Patent Application Publication 2016 / 0044971 discloses a bra incorporating a shape memory polymer and a method for manufacturing the same. The shape memory polymer is used to provide a porous thin film layer (openness: 10-90%). The breast movement frequency is 1-100 Hz, absorbing the force generated by breast movement. A method for constructing the front panel of a sports bra having a heat-induced shape memory polymer that exhibits viscoelastic properties at body temperature and hardens to absorb a force of approximately 0.015 N-0.03 N at breast movement frequencies of approximately 6 Hz-15 Hz is also disclosed. However, films used directly in bras have become capable of providing sufficient comfort to the wearer. Mesh patterns of laminated SMP layers are used to enhance breathability, but additional molding is required to form a concave shape that closely matches the shape of the wearer's breasts. In commercially available bra cups, fabric-laminated foam materials provide the best comfort instead of porous films. Perforated thin films are not compatible with commercially available bra cup material systems.

[0011] Japanese Patent Publication No. 2005089925 discloses a cup portion equipped with a cup support member made of shape memory resin that restores to its initial shape at a constant temperature. The constant temperature is the glass transition temperature T. g The optimal temperature range is 40-75°C. While the cup portion may deform after washing, it easily returns to its original shape, allowing for a beautiful bust line silhouette to be maintained at a constant temperature. However, in reality, the extra heating required to change the shape of the cups is inconvenient for the wearer in daily life. Furthermore, even if the bra shape is different, the problems arising from insufficient support in sports bras cannot be solved.

[0012] Roland's U.S. Patent No. 7,731,564B2 describes the use of memory foam inserts in bras, camisoles, shorts, and briefs. The memory foam inserts are designed to limit and prevent bouncing through the chest and hip areas during strenuous exercise. The invention conforms to an individual's body shape and form, providing a comfortable and secure fit. However, in sports bras, strenuous movement can cause the insert foam to become unstable, requiring overlock / cover stitching throughout the garment to bond the elements, potentially degrading the overall seamless circular knit design of the bra cups.

[0013] Finally, Chinese Patent No. CN2378955Y discloses a utility model providing a bra with shape memory functionality. A feature of this utility model is that the liner is made from NiTi shape memory alloy or other superelastic alloy, coated with silica gel or other elastic polymer material, and includes a silk screen with multiple ventilation holes. The lining is made from various woven and non-woven fabrics. Leather is used as a face mask to create bras or bra-attached underwear. While these bras have advantages such as being aesthetically pleasing, stable, soft, elastic, breathable, highly biocompatible, and having a pleasant feel, their construction uses special metal alloys, making the manufacturing process complex and increasing material costs. The presence of metal can also be dangerous for wearers engaging in strenuous exercise.

[0014] Therefore, in the field of the art, there is an unmet need for improved personal protective gear, clothing, underwear, sportswear, gear, and other specialized garments that incorporate improved shear-thickening materials to address the aforementioned shortcomings. [Overview of the project]

[0015] According to a first aspect of the present invention, a sports bra is provided that exhibits increased resistance in response to increased force. The sports bra includes a front curved region for accommodating the wearer's chest, the front curved region comprising a shear-thickened foam. The shear-thickened foam is relatively flexible up to a first force and becomes relatively rigid beyond the first force, holding the wearer's chest within the front curved region during strenuous physical activity. A back panel is connected to the front curved region, thereby at least partially transmitting force to the wearer's upper back or shoulder region.

[0016] According to a second aspect of the present invention, an automatic fitting and support foam is provided that can be used in body protection gear, clothing, underwear, sportswear and gear including sports bras, and other special-purpose clothing. The foam has a glass transition temperature in the range of 30 to 50°C, and its tangent delta value is 0.5 or greater in the 30 to 50°C range near body temperature, as measured by dynamic mechanical analysis (DMA) testing. The high damping characteristics near body temperature mean that it absorbs vibration energy and effectively eliminates vibrations during high-frequency motion. The foam has a load capacity of 30 to 100 kg / m³. 3 It has a density that allows it to be easily deformed by slow or static compression from the wearer's body. Furthermore, the foam is frequency-sensitive. Its elastic modulus is low under low-frequency movement and hardens under high-frequency movement at body temperature. Therefore, the foam can provide sufficient support to the breasts even under vigorous body movement, while at the same time being easily deformable to conform to the wearer's body shape under static pressure.

[0017] According to a third aspect of the present invention, a body protection element is provided that protects a part of the body from external impact. The body part may be the head, knee, shin, elbow, foot, leg, torso, arm, wrist, or hand, and the body protection element includes a housing that conforms to the shape of the selected body part. The housing contains a shear-thickened foam. [Brief explanation of the drawing]

[0018] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0019] FIG. 1 shows a sports bra according to an embodiment of the present invention.

[0020] FIG. 2 shows a sports bra according to a further embodiment.

[0021] FIG. 3 shows a sports bra according to a further embodiment.

[0022] FIG. 4 shows a sports bra according to a further embodiment.

[0023] FIG. 5 shows a sports bra according to a further embodiment.

[0024] FIG. 6 shows a sports bra according to a further embodiment.

[0025] FIG. 7 shows a sports bra according to a further embodiment.

[0026] FIG. 8 shows the DMA test results of the tangent delta (tanδ) of the automatic fitting and support form according to an embodiment of the present invention versus temperature.

[0027] FIG. 9 shows the DMA test results showing the relationship between the storage modulus (E’) of the automatic fitting and support form versus temperature.

[0028] FIG. 10 shows the results of the compression test of the automatic fitting and support form at different temperatures.

[0029] FIG. 11 shows the elastic modulus of the automatic fitting and support form at 1 Hz and 100 Hz at 25°C tested by DMA measurement.

[0030] Figure 12 shows the modulus of elasticity of the autofitting and support foam at 1 Hz and 100 Hz at 35°C, as tested by DMA measurement.

[0031] Figure 13 shows various body protection garments and gear incorporating automatic fitting and support foam.

[0032] Figure 14 shows various footwear incorporating automatic fitting and support foam. [Modes for carrying out the invention]

[0033] In the following description, personal protective gear, clothing, underwear, sportswear, sports equipment, and other specialized garments, and materials for manufacturing them, are given as preferred examples. It will be apparent to those skilled in the art that modifications, including additions and / or substitutions, can be made without departing from the scope and spirit of the invention. Certain details may be omitted in order not to obscure the invention. However, this disclosure is written so that those skilled in the art can carry out the teachings herein without excessive experimentation.

[0034] A. Sports bra design

[0035] The drawings will be described in detail. Figure 1 shows a sports bra according to one embodiment of the present invention. As shown in Figure 1, the bright areas indicate support elements or regions of the sports bra, where the support regions surround the breasts and continue to the back support to transfer force to the upper back and shoulder regions. The support regions include non-Newtonian foam, which will be described in more detail below. Generally, non-Newtonian foam is soft and flexible, and in low-frequency motion (<10Hz), it is 10 5 It has a low modulus of elasticity of less than Pa, and as the frequency of motion or force increases (>10 Hz), its modulus of elasticity increases (>10 5Pa). Thus, when not engaging in strenuous exercise, sports bras are soft, flexible, and comfortable to wear. When engaging in strenuous sports activities such as running, tennis, or jump rope, significant force is applied to the form due to breast movement, and the elastic modulus is also reduced to 10. 5 The elasticity increases to Pa or more. This increased elasticity suppresses unwanted breast movement and holds the breast within the curved breast-holding panel at the front. The sports bra of the present invention may or may not include the non-Newtonian foam of the present invention, and may include additional support cup-shaped inserts. Alternatively, the non-Newtonian foam surrounding the breast, as shown in Figure 1, can provide sufficient support on its own and act similarly to an underwire support, but without the rigid discomfort of an underwire.

[0036] Similarly, the configuration of the support element, indicated by the brightened area as shown in Figure 2, can mimic the support provided by conventional underwires. The form of this embodiment resists breast movement under large forces.

[0037] Figure 3 shows a further embodiment in which the brightened areas indicate support elements, providing a larger support non-Newtonian foam area and connecting to a back support strap via side panels to transfer force to the upper back and shoulder areas.

[0038] Figure 4 shows a further embodiment in which the brightened areas indicate the support elements, providing a pattern of concentric support forms that surround the entire front of the chest and interconnect with the posterior support. This configuration can further support a fuller bust.

[0039] Figure 5 shows a further embodiment where the brighter areas indicate support elements, providing another pattern that offers stronger support for individuals with a fuller bust. The mesh pattern foam covers the entire front and sides of the chest and continues to the back support to transfer the load.

[0040] Figure 6 shows a further embodiment for wearers with a fuller chest, where the brightened areas indicate support elements and include a large portion of the anterior chest area supported by non-Newtonian form.

[0041] Figure 7 shows a further embodiment that enhances lateral support to the chest by having a brightened area indicating the support elements and positioning non-Newtonian foam around the lateral and back support areas.

[0042] Support foam can be incorporated into sports bras by various technologies. Because there is no liquid matrix, such as the shear-thickening fluid of prior art, a variety of commercially scalable processes can be used in manufacturing. For example, but are not limited to, the support areas may be formed by extrusion, injection molding, punching, molding, hot pressing, 3D printing, cutting and sewing, or seamless joining techniques.

[0043] B. Automatic Fitting and Support Forms

[0044] According to a second aspect of the present invention, an automatic fitting and support foam is provided, which may be a shear-thickening foam or a non-Newtonian foam. The automatic fitting and support can be used in body protection gear, clothing, underwear, sportswear and gear such as sports bras, and other special-purpose clothing.

[0045] Figure 8 shows the DMA test results illustrating the relationship between the tangent delta (tanδ) and temperature of the automated fitting and support foam. The test was performed in compression mode. The frequency was 1 Hz and the heating rate was 3 °C / min. As shown in Figure 8, the glass transition temperature of the foam is 30–50 °C, which is close to body temperature. The tangent delta (tanδ) in the 30–50 °C range is greater than 0.5. A high tanδ value means that the foam has high damping characteristics near body temperature, meaning that it can absorb vibrational energy and stop vibrations during high-frequency motion.

[0046] Referring to Fig. 9, the DMA test results showing the relationship between the storage modulus (E’) of the automatic fitting and the support form and temperature are presented. The test was carried out in the compression mode. The frequency was 1 Hz and the heating rate was 3 °C / min. As shown in Fig. 9, the form is temperature-dependent. The change in the compression modulus of the form is approximately one order of magnitude between 25 °C and 36 °C, and it is 6×10 5 Pa at 25 °C and 8×10 4 Pa at 36 °C. E’(25 °C) / E’(36 °C) = 7.5.

[0047] Fig. 10 shows the results of compression tests on the automatic fitting and the support form at different temperatures of 23 °C (thick line) and 35 °C (thin line), respectively. The maximum compression rate was 50%. In the compression test using a universal tensile testing machine, the form shows a similar trend to that tested by DMA. The compression stress (S) at 50% strain at 23 °C is about 0.25 MPa, while at 35 °C it is about 0.05 MPa. S(23 °C) / S(35 °C) = 5.

[0048] The form is not only sensitive to temperature but also to frequency. Referring to Fig. 11, the elastic moduli of the automatic fitting and the support form at 1 Hz and 100 Hz at 25 °C tested by DMA measurement are shown. The measurement was carried out at an isothermal temperature of 25 °C and the test time was 30 minutes. The form was tested in the compression mode by DMA under the isothermal condition of 25 °C. Two frequency values of 1 Hz and 100 Hz were used respectively. The test was carried out for 30 minutes under these conditions. At 25 °C, the elastic modulus is about 7.5×10 5 Pa at 100 Hz, but 4×10 4 Pa at 1 Hz. At 25 °C, E’(100 Hz) / E’(1 Hz) = 18.8.

[0049] Referring to Fig. 12, the form was also tested at 35 °C under similar conditions. The elastic modulus is about 5×10 5 Pa at 100 Hz and 8×10 3The pressure is Pa. At 35°C, E'(100Hz) / E'(1Hz) = 62.5. Because the glass transition temperature of foam is close to body temperature, the E'(100Hz) / E'(1Hz) value at 35°C is much larger than that at 25°C. Therefore, foam has excellent frequency sensitivity at body temperature, meaning it has a low modulus of elasticity for low-frequency motion at body temperature and a high modulus of elasticity for high-frequency motion.

[0050] If the foam is polyurethane foam, it may contain the following components: 100 parts of a polyether mixture, 0.5 to 5 parts of water as a blowing agent, 0.2 to 2 parts of a foam stabilizer, 0.2 to 2 parts of a bubble release agent, 0.1 to 1 part of a catalyst mixture, and 30 to 75 parts of diisocyanate. The R value calculated from the number of moles of isocyanate groups to the total number of moles of hydroxyl groups is in the range of 0.9 to 1.1. The polyether mixture contains trifunctional and / or bifunctional polyethers with a molecular weight in the range of 500 to 8000. The diisocyanate consists of tolylene diisocyanate, methylenediphenyl diisocyanate, isomers of isocyanates, and mixtures thereof.

[0051] The glass transition temperature may be in the range of 30 to 50°C, and the tangent delta value measured at 1 Hz by DMA testing at 30 to 50°C may be 0.5 or higher. Furthermore, the elastic modulus may decrease as the temperature increases from 20°C to 50°C.

[0052] In various embodiments of the present invention, other types of foam may also be used. One such example, though not limited to, is an energy-absorbing foam material, which is non-impact resistant under long pressurization times and impact resistant under short pressurization times. Long pressurization times range from approximately 0.1 seconds to 1,000 seconds, while short pressurization times are approximately 0.1 seconds or less. Under short pressurization times, the modulus of elasticity of the energy-absorbing foam material is approximately 10 times greater than that under long pressurization times, indicating that the energy-absorbing foam material is suitable for providing some degree of impact protection. The transition from low modulus (non-impact configuration) to high modulus (impact configuration) occurs rapidly without time delay. In one embodiment, the energy-absorbing foam material is flexible and resilient to various types of loads, such as compression, tension, shear, and torsion. Furthermore, it also possesses the ability to adapt to the geometric figure / shape of the designed object and maintain close contact with the object to be protected. This is extremely important for a protective material because the induced damage is related to the maximum force produced by the impact divided by the area over which the force is applied. The energy-absorbing foam material of the present invention can absorb impact energy and reduce the force in the area where the force is applied, thereby significantly reducing the impact stress and pressure.

[0053] The foam material may include at least one shape memory polymer foam and additives. Examples of shape memory polymer foams include, but are not limited to, polyurethane foam, polystyrene foam, silicone rubber foam, polyvinyl chloride foam, ethylene vinyl acetate foam, polyester block copolymer foam, and various combinations thereof. The amount of shape memory polymer foam is at least about 50% of the total weight. Examples of additives include, but are not limited to, antioxidants, flame retardants, and inorganic fillers, and the amount of additives is less than about 50% of the total weight.

[0054] The foam materials provided in various embodiments of the present invention are closed-cell foams or open-cell foams. The cells contain, but are not limited to, gases, vapors, or blowing agents. For example, the gas may be nitrogen or carbon dioxide. Typically, in some embodiments, the gas or vapor is uniformly or non-uniformly dispersed within the material, depending on the application. The presence of gas or vapor in the foam material not only reduces the overall density of the foam material but also provides cushioning to the foam material through a pneumatic effect. These pneumatic dampings are important for absorbing and dissipating energy when an impact occurs suddenly.

[0055] The elastic modulus of the energy-absorbing foam material of the present invention is affected by, but is not limited to, factors such as temperature, the time for which force is applied, load, or frequency. At 35°C, the elastic modulus of the energy-absorbing foam material at a force application time of approximately 0.005 to 0.01 seconds (i.e., a frequency of approximately 100 to 200 Hz) is approximately 10 times that at a force application time of approximately 1 to 10 seconds (i.e., a frequency of approximately 0.1 to 1 Hz). Furthermore, at temperatures above 45°C, the difference in elastic modulus increases to approximately 100 times.

[0056] The glass transition temperature of energy-absorbing foam materials is below the pressurization temperature at pressurization times of approximately 0.1 to 1 second (i.e., frequencies of approximately 1 to 10 Hz), exhibiting rubbery, flexible behavior. Furthermore, the glass transition temperature of energy-absorbing foam materials is higher than the pressurization temperature at pressurization times of approximately 0.01 to 0.001 seconds (i.e., frequencies of approximately 100 to 1000 Hz), exhibiting glassy, ​​hard, and rigid behavior. The yield point of the foam material is approximately 0.5 kPa to 1 MPa. On the other hand, the yield stress is approximately 0.5 kPa to 1 MPa. Beyond the yield point, a certain degree of deformation easily occurs.

[0057] C. Body protection elements incorporating non-Newtonian forms

[0058] In a third aspect, the automatic fitting and support foam of various embodiments of the present invention can be applied to body protection equipment. This equipment includes, but is not limited to, shin guards, ankle guards, wrist protectors, knee pads, leg shields, torso shields, gloves, shoulder pads, helmets, footwear, and the like. In each of these embodiments, the automatic fitting and support foam can be easily applied within a body-fitting housing to create a flexible, wearable shield that provides complete protection from impacts (e.g., from falls or collisions with inanimate objects) from objects, people, or the wearer, while allowing the user free movement.

[0059] Figure 13 shows various body protection clothing and gear incorporating self-fitting and support foam, with brightened areas indicating protective elements. Specific protective elements include shoulder, neck, arm, leg, knee, wrist, and torso protectors, which are shaped to conform to the body as a shell and filled with self-fitting and support foam. Figure 14 shows various footwear incorporating self-fitting and support foam, with brightened areas indicating protective elements. Self-fitting and support foam can be incorporated into body protection clothing, gear, and footwear through various technologies. For example, but not limited to, protective elements may be formed by extrusion, injection molding, punching, molding, hot pressing, 3D printing, cutting and sewing, or seamless joining technologies.

[0060] Throughout this specification, unless otherwise required by context, variations such as “comprise,” “comprises,” or “comprising” mean to include the integer or set of integers described, and do not mean to exclude other integers or sets of integers. Furthermore, it should be noted that in this disclosure, particularly in the claims and / or paragraphs, terms such as “comprises,” “comprised,” and “comprising” may have their own meanings. For example, they may allow elements not explicitly described, but exclude elements found in the prior art or elements that affect the fundamental or novel features of the present invention.

[0061] Furthermore, throughout this specification and the claims, unless otherwise required by context, variations such as “include,” “includes,” or “included” mean to include the integer or set of integers described, and do not mean to exclude other integers or sets of integers.

[0062] References to "one embodiment," "an embodiment," "an example embodiment," etc., in this specification indicate that while the described embodiments may include certain features, structures, or characteristics, not all embodiments necessarily include those features, structures, or characteristics. Furthermore, such expressions do not necessarily refer to the same embodiment. Moreover, if certain features, structures, or characteristics are described in relation to an embodiment, it is within the knowledge of those skilled in the art that such features, structures, or characteristics will be affected in relation to other embodiments, whether explicitly stated or not.

[0063] In consideration of these teachings, it will be understood by those skilled in the art that alternative embodiments can be carried out without departing from the spirit or scope of the invention, as described in the appended claims. The invention is limited only by the following claims, including all embodiments and modifications, as viewed in conjunction with the above specification and the appended drawings.

Claims

1. A sports bra that exhibits increased resistance in proportion to increased force, A front curved region for accommodating the wearer's breasts, the front curved region comprising a shear thickening foam, the shear thickening foam being relatively flexible up to a first force and becoming relatively rigid beyond the first force, holding the wearer's breasts within the front curved region, the shear thickening foam comprising the following components: 100 parts of a polyether mixture, 0.5 to 5 parts of water as a foaming agent, 0.2 to 2 parts of a foam stabilizer, 0.2 to 2 parts of a bubble release agent, 0.1 to 1 part of a catalyst mixture, and 30 to 75 parts of diisocyanate, the R value calculated from the number of moles of isocyanate groups to the number of moles of total hydroxyl groups being in the range of 0.9 to 1.1, the polyether mixture comprising trifunctional and / or bifunctional polyethers with a molecular weight in the range of 500 to 8000, and the diisocyanate comprising tolylene diisocyanate, methylenediphenyl diisocyanate, and isomers of the above isocyanate, the front curved region, A back panel connected to the front curved region, thereby transmitting force at least partially to the upper back or shoulder region of the wearer, A sports bra equipped with these features.

2. The sports bra according to claim 1, wherein the shear-thickened foam is a polyurethane-based foam, polystyrene foam, silicone rubber foam, polyvinyl chloride foam, ethylene vinyl acetate foam, and polyester block copolymer foam.

3. The aforementioned shear-thickened foam exhibits a low modulus of elasticity (<10 Hz) under low-frequency motion (<10 Hz). ５ It has Pa, and as the frequency or force of motion increases (>10 Hz), its modulus of elasticity increases (>10 Hz). ５ Pa), the sports bra according to claim 2.

4. A foam for sports bra cups with automatic fitting and support functions, wherein the foam has a low modulus of elasticity (<10 Hz) under low-frequency motion (<10 Hz). ５ It has Pa, and as the frequency or force of motion increases (>10 Hz), its modulus of elasticity increases (>10 ５ Pa), The foam comprises the following components: 100 parts of a polyether mixture, 0.5 to 5 parts of water as a foaming agent, 0.2 to 2 parts of a foam stabilizer, 0.2 to 2 parts of a foam release agent, 0.1 to 1 part of a catalyst mixture, and 30 to 75 parts of diisocyanate, wherein the R value calculated from the number of moles of isocyanate groups to the total number of moles of hydroxyl groups is in the range of 0.9 to 1.1, the polyether mixture comprises trifunctional and / or bifunctional polyethers with a molecular weight in the range of 500 to 8000, and the diisocyanate consists of tolylene diisocyanate, methylenediphenyl diisocyanate, and isomers of the above isocyanate.

5. The form according to claim 4, wherein the glass transition temperature is in the range of 30 to 50°C, and the tangent delta value at 30 to 50°C measured at 1 Hz by DMA test is 0.5 or more.

6. The foam according to claim 4, wherein the modulus of elasticity decreases as the temperature rises from 20°C to 50°C.

7. A body protection element that protects a part of the body from external impact, The aforementioned body part is selected from the head, knee, shin, elbow, foot, leg, torso, arm, wrist, or hand. The aforementioned body protection element is A housing that conforms to the shape of the selected body part, The shear-thickening foam contained within the housing comprises the following components: 100 parts of a polyether mixture, 0.5 to 5 parts of water as a foaming agent, 0.2 to 2 parts of a foam stabilizer, 0.2 to 2 parts of a bubble release agent, 0.1 to 1 part of a catalyst mixture, and 30 to 75 parts of diisocyanate, wherein the R value calculated from the number of moles of isocyanate groups to the total number of moles of hydroxyl groups is in the range of 0.9 to 1.1, the polyether mixture comprises trifunctional and / or bifunctional polyethers with a molecular weight in the range of 500 to 8000, and the diisocyanate is composed of tolylene diisocyanate, methylenediphenyl diisocyanate, and isomers of the above isocyanate, and the shear-thickening foam comprises the following components: 100 parts of a polyether mixture, 0.5 to 5 parts of water as a foaming agent, 0.2 to 2 parts of a foam stabilizer, 0.2 to 2 parts of a bubble release agent, 0.1 to 1 part of a catalyst mixture, and 30 to 75 parts of diisocyanate, wherein the R value calculated from the number of moles of isocyanate groups to the number of moles of total hydroxyl groups is in the range of 0.9 to 1.1, the polyether mixture comprises trifunctional and / or bifunctional polyethers with a molecular weight in the range of 500 to 8000, and the diisocyanate is composed of tolylene diisocyanate, methylenediphenyl diisocyanate, and isomers of the above isocyanate, and A body protection element that includes these features.

8. The body protection element according to claim 7, wherein the shear-thickened foam is a polyurethane-based foam, polystyrene foam, silicone rubber foam, polyvinyl chloride foam, ethylene vinyl acetate foam, and polyester block copolymer foam.

9. The aforementioned shear-thickened foam exhibits a low modulus of elasticity (<10 Hz) under low-frequency motion (<10 Hz). ５ It has Pa, and as the frequency or force of motion increases (>10 Hz), its modulus of elasticity increases (>10 Hz). ５ Pa), the body protection element according to claim 8.

Images