C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/70 (2006.01) B29D 35/12 (2010.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/79 (2006.01) C08J 9/08 (2006.01) C08K 3/20 (2006.01)
Patent
CA 2547103
Microcellular polyurethane flexible foams having densities no greater than 0.3 g/cc which are suitable for use as lightweight shoe sole components are produced with carbon dioxide in an amount such that the polyurethane-forming mixture has a free rise density of from about 0.03 to about 0.3 g/cc. At least a portion of that carbon dioxide is dissolved as a gas into one or both of the reaction components. The amount of dissolved carbon dioxide must be such that the froth density of the isocyanate and/or isocyanate-reactive component(s) in which the carbon dioxide is dissolved will be from about 0.1 to about 0.8 g/cc. Additional carbon dioxide may be formed by the reaction of water and isocyanate during the polyurethane-forming reaction but the total amount of CO2 present should be controlled to ensure that the polyurethane-forming mixture has a free rise density of from about 0.03 to 0.3g/cc. Use of a preferred isocyanate-reactive component in which a specified ratio of diol to triol is satisfied makes it possible to use more water than had been expected. Use of a preferred prepolymer makes it possible to produce microcellular polyurethanes having good physical properties solely with a diol. The product microcellular foams possess a 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.
Baily David M.
Carpenter Charles R.
Younes Usama E.
Bayer Materialscience Llc
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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