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US 2017/0291981 A1Published application
Method for preparing thermoplastic polyurethane pellets
AssigneeRoquette Freres
InventorsRené SAINT-LOUP, Jérôme GIMENEZ, Henri SAUTEL
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Abstract
The present invention relates to a method for manufacturing thermoplastic polyurethane pellets by means of reactive extrusion of: a long macrodiol with a molecular weight of 500 to 3000 g/mol; a diisocyanate; at least one chain extender comprising a dianhydrohexitol; and a polymerization catalyst. The invention also relates to the resulting thermoplastic polyurethane pellets.
Claims11
A method for manufacturing thermoplastic polyurethane pellets by reactive extrusion, comprising:
- introducing, into an extruder, a macrodiol (a) of molar mass from 500 to 3000 g/mol, a diisocyanate (b), at least one chain extender (c) comprising a dianhydrohexitol and a polymerization catalyst (d), said compounds (a), (b), (c) and (d) being introduced into the extruder in liquid form;
- mixing the compounds (a), (b), (c) and (d) and polymerizing said mixture in the extruder;
- and
- extruding and cutting said polymerized mixture to form the thermoplastic polyurethane pellets.
1 more element
Dependencies are inferred from the claim text.