DE102012013335A1 - Shoe has sole, upper shoe and heel that are provided in heel area for three-dimensional freedom of movement, and heel is manufactured from reactive polyurethane (PUR), prepolymer, polyol mixture, curing agent and catalyst - Google Patents

Abstract

The shoe has a sole (2), an upper shoe and heel (1) that is provided in the heel area for three-dimensional freedom of movement. The hell is manufactured from reactive polyurethane (PUR), prepolymer, a polyol mixture, a curing agent and a catalyst. The polyol mixture in the reactive polyurethane is selected from the group of polyesters, polyether, polyaspartate, polycarbonate polyols, polyurethanes, polypropylene glycols, and polypropylentriole.

Description

The present invention relates to a shoe with increased comfort and three-dimensional freedom of movement.

In their basic construction, shoes consist of a sole, an over upper shoe and a heel area heel. Depending on the type of shoe, the sole can be further subdivided into an outsole and an insole. To increase the wearing comfort, many shoes have a separate insole. Shoes are developed according to their field of use and adapted, for example, for medical orthopedic applications for the practice of sports, for hiking or for special work assignments (for example in the form of boots, protective shoes). In all areas, however, efforts are made to allow the wearer optimal comfort.

The vast majority of footwear is mass-produced, so the footwear created in this way will meet the needs of average shoe sizes and shapes. However, optimal wearing comfort is only obtained if the shoe, including the sole and the upper shoe, is made individually for the respective wearer. Even then, however, the composition and material properties, especially the sole, of considerable importance, for example, to cushion the impact on the occurrence. This even goes so far as to capture the biometric data of the wearer and to use this to create design data for sole, upper shoe and last to produce a shoe adapted to the wearer according to the design data. Such a method is for example in the DE 10 2005 023 473 A1 described.

Soles and heels on shoes can be made of different materials. Has proven to be a plastic composition with the specific damping properties, especially in shoe soles, can be achieved. In the US 4,418,483 A discloses a shoe sole in which a viscous material in the form of a plastic composition is used in a layer structure as a possible layer. This plastic composition consists of a crosslinked ethylene-vinyl acetate copolymer and leads to an increase in the tensile strength. The US 4,316,335 A describes the use of a viscous shock absorbing material both in the forefoot area of a sole and in the heel area. A similar material is also in the US 4,910,886 A described.

Rubbery compositions of polymer blends are also disclosed in U.S. Pat US 4,616,065 A , of the US 4,546,127 A as well as the EP 1 268 663 B1 described.

In addition to the peculiarity of the sole to have certain wearing properties through their material composition, another approach is to bring about the wearing properties of the footwear via the shoe insert. Such a shoe insert is for example in the EP 1 124 461 B1 described. This consists of a compressible, porous support layer, which is impregnated with a storage-stable, curable resin. For example, to obtain the desired resin, a suitable polyol and a polyisocyanate are selected so as to form a polyurethane prepolymer resin. The resin systems described therein use a catalyst to control the setting time and cure time of the resin.

In addition to the sole and the shoe insert, however, the heel also offers an important opportunity to influence the wearing properties of the shoe. This has the advantage that the sole, the upper shoe and the shoe insert can be produced in a conventional manner, while the heel has the desired properties.

Against this background, it is an object of the present invention to provide an improved material composition for the heel of a shoe in order to increase the wearing comfort of a shoe produced therewith and also to provide the opportunity to protect the joints and to activate the musculature of the wearer.

This object is achieved by a shoe having the features of claim 1. Preferred embodiment can be found in the subclaims again.

The shoe of the invention gives the wearer both an increased comfort, protects the joints and also strengthens the muscles. The shoe has a common basic construction, consisting of a sole, an over upper shoe and a heel, which is located in the heel area. If necessary, in the shoe construction, a stiffening element (English: "shank") from hard plastic or metal are used. Such a stiffener is used to maintain the shape between heel and sole at higher heels.

The shoe according to the invention has the special property that the paragraph due to the selected material composition has outstanding spring properties, which cause the material is returned after a successful load in the course of a subsequent discharge in the original state. As a result, for example, shocks and vibrations when walking or walking are mitigated, which significantly increases the comfort. The recovery properties of the material function as a memory in which the material is deformed under load and then springs back to the original state during the subsequent discharge.

• – wenigstens einem Isocyanat-Prepolymer,
• – einem Polyol-Gemisch,
• – einem Härtungsmittel,
• – einem Katalysator.

In order to bring about these properties, the paragraph according to the invention consists of a reactive polyurethane (polyurethane system) having the following composition:

• At least one isocyanate prepolymer,
• A polyol mixture,
• A curing agent,
• A catalyst.

A preferred isocyanate prepolymer is, for example, diphenylmethane diisocyanate.

The polyol mixture consists for example of a mixture of one or more of the following components: polyesters, polyethers, polyaspartates, polycarbonate-polyols, polyurethanes, polypropylene glycols, polypropylene triols.

The curing agent used in the composition is necessary to bring about crosslinking of the polyols with the isocyanate prepolymers. It is possible to use known curing agents.

The reaction accelerator used is a catalyst. The catalyst controls the setting time and the curing time. Optionally, plasticizers may also be added to the composition to control the elasticity of the material compositions. It is preferable to use USC-1 as catalyst in an amount of 0.5 to 2%, preferably 1%.

In the preparation of the mixture, the catalyst, optionally dyes and the polyol mixture is mixed together. The mixture is foamed to a foam. The mixing ratio of the polyol to the catalyst is preferably 450 to 650 g per 60 liters of polyol, with 550 g at 60 liters (net weight: 55 kg) of polyol mixture being particularly preferred. In order to control the reaction time, the amount of catalyst and the mixing ratio between isocyanate and polyol are adjusted. Preferably, the mixing ratio between isocyanate and polyol is 100: 140 to 100: 200. In order to obtain a higher degree of hardness, the curing agent is added to the polyol mixture prior to its blending. The amount of the curing agent added depends on the mixing ratio between isocyanate and polyol. The hardness of the PUR (polyurethane) system can be adjusted based on the mixing ratios.

The inventive composition of the PUR (polyurethane) system for heel has a Shore C hardness of 25 to 50. The composition of the invention also has a specific gravity, which is preferably between 0.25 and 0.40 g / cm ³ . The viscosity of the PUR (polyurethane) system at 35 ° Celsius is preferably 2400 +/- 300 CPS.

In one embodiment, MP7000 is used as the isocyanate prepolymer, as the polyol IR 7030 and as catalyst USC-1 (with 1%) for the polyurethane (polyurethane) system according to the invention. The mixing ratio between isocyanate prepolymer and polyol in this embodiment is 100: 193. The Shore hardness is 35-40 C and the density 0.46 + / 0.01.

The heel can be constructed either entirely from a material composition or from different PUR (polyurethane) systems with different degrees of hardness. Preferably, the heel consists of more than two layers of PUR (polyurethane) systems with different degrees of hardness and / or specific weights.

In a particularly preferred embodiment, the paragraph in the longitudinal section of different material compositions with different Shore degrees of hardness and / or specific weights built up. The material on the inside of the foot in this case according to the invention has a higher Shore hardness than the material on the outside of the foot. By using different material compositions with different degrees of hardness in the foot inside or Fußaußenbereich the paragraph kinking of the foot of the wearer can be prevented inside. Such a property can be very advantageous, in particular, if the foot of the wearer is medically malformed or due to other circumstances a kinking of the foot upon occurrence is possible.

In a further embodiment, the layer structure is constructed in cross section from different material compositions having different Shore hardness levels and / or specific weights.

The shoe according to the invention with its soft heel allows increased wearer comfort, protects the joints and also strengthens the muscles.

The soft material of the heel allows adaptation to the load / relief of the hindfoot and absorbs shocks when they occur. This spring effect of the material composition of the heel according to the invention caused by the restoring force ("rebouncing") is ultimately also responsible for the activation of the musculature in the leg area. As a result, several advantageous properties would be achieved with a single material composition.

The following figure shows the structure of a shoe according to the invention, consisting of a paragraph 1 , a sole 2 and an upper shoe 3 ,

In one embodiment, the mixture of the polyurethane (polyurethane) system for the paragraph of the invention is composed as follows: The mixing ratio of polyol and catalyst at a volume of 60 l (net weight: 55 kg) is 550 g as standard.

The mixing ratio between isocyanate prepolymer (PP) and polyol mixture is as follows: Amount of catalyst (g / 60 l polyol) Mixing ratio (isocyanate-PP: polyol) 490 g 100: 160 550 g 100: 159 610 g 100: 158

The amount of curing agent and the mixing ratio between isocyanate and polyol are as follows (P = isocyanate prepolymer, R = polyol mixture): 0 phr 0.5 phr 1 phr Hardener (g) 0 275 550 Dye (g) varies varies varies Catalyst (g) 550 550 550 Mixing ratio P: R 100: 159 100: 151 100: 144

In another exemplary embodiment, the amount of catalyst and mixing ratio of isocyanate to polyol is set as follows: Amount of catalyst (g / 20 l polyol) Mixing ratio (isocyanate PP: polyol) 160 g 100: 195 180 g 100: 193 200 g 100: 191

The amount of the curing agent and the mixing ratio between isocyanate and polyol is set in an exemplary embodiment as follows (P = isocyanate prepolymer, R = polyol mixture): 0 phr 1 phr 2 phr Hardener (g) 0 180 360 Catalyst (g) 180 180 180 Dye (g) varies varies varies Mixing ratio P: R 100: 193 100: 183 100: 175 Specific weight (g / cm ³ ) 12:25 ~ 12:33 12:25 ~ 12:33 12:25 ~ 12:33 Shore C hardness 25 ~ 35 30 ~ 40 35 ~ 45

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102005023473 A1 [0003]
• US 4418483 A [0004]
• US 4316335 A [0004]
• US 4910886 A [0004]
• US 4616065 A [0005]
• US 4546127 A [0005]
• EP 1268663 B1 [0005]
• EP 1124461 B1 [0006]

Claims (10)

Shoe with increased comfort and three-dimensional freedom of movement, consisting of a sole ( 2 ), an upper shoe ( 3 ) and a paragraph ( 1 ) in the heel region, characterized in that the heel is made of a reactive PUR (polyurethane) system having the following composition: - at least one isocyanate prepolymer, - a polyol mixture, - a curing agent, - a catalyst. Shoe according to claim 1 or 2, characterized in that the polyol mixture in the reactive PUR (polyurethane) system comprises one or more components selected from the group consisting of polyesters, polyethers, polyaspartates, polycarbonate-polyols, polyurethanes, polypropylene glycols, Polypropylentriole. Shoe according to one of the preceding claims, characterized in that the Shore C hardness of the reactive PUR (polyurethane) system of paragraph 25 to 50. Shoe according to one of the preceding claims, characterized in that the specific gravity of the reactive PUR (polyurethane) system of the paragraph is 0.25 to 0.40 g / cm ³ . Shoe according to one of the preceding claims, characterized in that the reactive PUR (polyurethane) system of the paragraph is constructed throughout with the same Shore C hardness. Shoe according to one of the preceding claims, characterized in that the heel is constructed in longitudinal section of different material compositions with different Shore degrees of hardness, wherein the material on the inner side of the foot has a higher Shore hardness than the material to the foot outside. Shoe according to one of the preceding claims, characterized in that the mixing ratio between isocyanate prepolymer and polyol 100: 140 to 100: 200 Shoe according to one of the preceding claims, characterized in that the mixing ratio between the polyol mixture and the catalyst is 450 to 650 g per 60 liters of polyol mixture. Shoe according to one of the preceding claims, characterized in that the shoulder is built up continuously from a PUR (polyurethane) system with a degree of hardness. Shoe according to one of the preceding claims, characterized in that the heel is constructed of more than two layers of PUR (polyurethane) systems with different degrees of hardness.

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