Carbon dioxide blown low density, flexible microcellular elastomers suitable for preparing shoe components

a microcellular elastomer and low density technology, applied in the field of carbon dioxide blown low density, flexible microcellular elastomers suitable for preparing shoe components, can solve the problems of exceptionally difficult production of water-blown microcellular foam, and achieve the effects of low density, low density and high hardness

Inactive Publication Date: 2002-09-19
BAYER ANTWERPEN NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0004] It has been surprisingly discovered that low density, and particularly very low density, polyurethane flexible microcellular elastomers may be prepared if the major portion of the water blowing agent is replaced by dissolved CO.sub.2. Polyurethanes produced in this manner from ultra-low unsaturation polyols exhibit mechanical pro

Problems solved by technology

Yet more surprising, polyester polyol-based microcellular, flexible polyurethane elastomers may be easil

Method used

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  • Carbon dioxide blown low density, flexible microcellular elastomers suitable for preparing shoe components

Examples

Experimental program
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example 1

[0031] In the above formulation 1.0 g / l of CO.sub.2 was dissolved in the prepolymer side and 0.1 g / l CO.sub.2 was dissolved in the polyol side. The tanks were maintained at 50 psi and 35 degrees .degree. C. This resulted in foam densities of the separate components at atmospheric pressure of 0.52 and 0.95 g / cm.sup.3 respectively. The two components were mixed at a ratio of 0.84 using a low pressure machine and the material allowed to flow and expand into a 10 mm thick mold.

example 2

[0032] In the above formulation 1.4 g / l of CO.sub.2 was dissolved in the prepolymer side and 0.95 g / l CO.sub.2 was dissolved in the polyol side. The tanks were maintained at 50 psi and 35 degrees .degree. C. This resulted in individual foam densities at atmospheric pressure of 0.31 and 0.51 g / cm.sup.3 respectively. The two components were mixed at a ratio of 0.84 using a low pressure machine and the material allowed to flow and expand into a 10 mm thick mold.

example 3

[0033] In the above formulation 1.5 g / l of CO.sub.2 was dissolved in the prepolymer side and 1.25 g / l CO.sub.2 was dissolved in the polyol side. The tanks were maintained at 50 psi and 35 degrees .degree. C. This resulted in foam densities at atmospheric pressure of 0.25 and 0.37 g / cm.sup.3 respectively. The two components were mixed at a ratio of 0.84 using a low pressure machine and the material allowed to flow and expand into a 10 mm thick mold.

[0034] The properties obtained from these examples are compared in the following table:

1 TABLE 1 Example 1 Example 2 Example 3 Part Density, g / cm.sup.3 0.64 0.43 0.23 Hardness, Asker C 82 69 36 Tensile Str. Kg / cm.sup.2 56 30 10 Split Tear, kg / cm 4.9 3.0 1.8 C Tear, kg / cm 19.6 11.7 6.2 Resilience 42 41 37

[0035] As can be seen, the subject invention process produces elastomers with high hardness values. Even at an ultra-low density of about 0.23 g / cm.sup.3, the hardness is still 36 on the Asker C scale, and the resilience quite high as well,...

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Abstract

Microcellular polyurethane flexible foams suitable for use as lightweight shoe sole components are produced by dissolving carbon dioxide into one or both of the iso-side or resin-side of an isocyanate-prepolymer-based microcellular polyurethane foam formulation. The resultant foams possess more uniform cell structure and enhanced physical properties as compared to all water-blown foams of the same basic formulation and density. The hardness of the foams is more suitable for shoe sole, particularly midsole applications, than that of the water-blown foams, despite the lower urea hard segment content of the CO2 blown foams.

Description

[0001] The present invention pertains to low density, flexible microcellular elastomers suitable, inter alia, for the preparation of molded shoe soles, inners, and midsoles.[0002] Cushioned soles for footware, particularly athletic footware are generally prepared from EVA (ethylenevinylacetate) microcellular foams. The processing of such foams is not straightforward, and the foams themselves do not have optimal properties. However, such foams continue to be used due to their availability in the very low density range, i.e., 0.1 g / cm.sup.3 to 0.35 g / cm.sup.3.[0003] Polyurethane polymers generally exhibit physical properties which are superior to EVA polymers. However, numerous difficulties arise when attempts are made to mold polyurethane microcellular foams at low densities. Due to the hardness required for the end use, considerable amounts of low molecular weight chain extenders are required. In prior microcellular foams which are water-blown, the urea short segments which are crea...

Claims

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Application Information

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IPC IPC(8): A43B13/00A43B13/38A43B13/40B29C67/20C08G18/12C08G18/48C08G18/65C08G18/79C08G101/00C08J9/08C08J9/12
CPCC08G18/12C08G18/4072C08G18/4841C08G18/4866C08G18/6564C08G18/797C08G2101/0008C08G2101/0066C08G2410/00C08J9/122C08J2205/06C08J2375/04C08G18/6674C08G18/40C08G2110/0066C08G2110/0008C08J9/08
Inventor YOUNES, USAMA E.
Owner BAYER ANTWERPEN NV
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