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1. WO1997044374 - ELASTOMERES MICRO-CELLULAIRES AVEC POSSIBILITES DE TRAITEMENT ET PROPRIETES AMELIOREES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims:

1. A microcellular polyurethane shoe sole component, comprising:
the catalyzed reaction product of
a) an isocyanate component comprising an isocyanate-terminated prepolymer having an NCO group content of from 12 to 20 weight percent comprising the reaction product of a stoichiometric excess of one or more di- or polyisocyanates with a polyoxypropylene diol, said diol having an unsaturation lower than about 0.02 meq/g, containing from 5 to 15 weight percent random oxyethylene moieties, and having a molecular weight between about 2000 Da and 8000 Da; with
b) a resin component, comprising:
b)i) an aliphatic or cycloaliphatic diol chain extender having a molecular weight of less than about 400 Da;
b)ii) optionally, one or more polyol polymer dispersions; and
b)iii) water in an amount effective to provide a microcellular density of from about 0.15 to about 0.60 g/cm3
at an isocyanate index of from about 85 to 115.

2. The shoe sole component of claim 1 or claim 2 wherein said di- or poiyisocyanate is selected from the group consisting of MDI, MDI variants, and mixtures thereof.

3. The shoe sole component of claim 1 wherein said polyoxypropylene diol has a molecular weight between about 2000 Da and 4000 Da.

4. The shoe sole component of any one of claims 1 to 3 wherein the isocyanate index is from about 95 to about 105.

5. The shoe sole component of any one of claims 1 to 4 wherein said component is a midsole having a density of from about 0.2 g/cm3 to about 0.35 g/cm3.

6. The shoe sole component of any one of claims 1 to 4 wherein said component is a unitsole having a density of from about 0.30 g/cm3 to about 0.60 g/cm3.

7. A method of improving the physical properties of microcellular polyurethane shoe sole components prepared by the reaction of an isocyanate component with a resin component containing a diol chain extender, said method comprising:
selecting as a major portion of said isocyanate component, an isocyanate-terminated prepolymer having an NCO group content of from about 12 to about 20 weight percent, said prepolymer prepared by reacting a stoichiometric excess of one or more di- or polyisocyanates with a polyoxypropylene diol, said diol having an unsaturation less than about 0.02 meq/g, containing from about 5 to about 15% random oxyethylene moieties, and having a molecular weight of from about 2000 Da to 8000 Da; and
reacting said isocyanate component with a diol chain extender component at an index of from about 75 to about 130 in the presence of an amount of water effective to produce a microcellular elastomer having a density of from about 0.15 g/cm3 to about 0.060 g/cm3.

8. The method of claim 7 wherein said di- or poiyisocyanate is selected from the group consisting of MDI, MDI variants, and mixtures thereof.

9. The method of claim 7 or claim 8 wherein said polyoxypropylene diol has a molecular weight of from about 2000 Da to about 4000 Da.

10. The method of any one of claims 7 to 9 wherein said reaction takes place at an isocyanate index of from about 95 to about 105.

11. The method of any one of claim 7 to 10 wherein said shoe sole component has a density of from about 0.20 g/cm3 to about 0.50 g/cm3.

12. The method of any one of claims 7 to 11 wherein said diol chain extender is an aliphatic or cycloaliphatic diol chain extender having a molecular weight less than 300 Da.

13. The method of claim 12 wherein said diol chain extender comprises 1,4-butanediol.