C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/08 (2006.01) C08G 18/16 (2006.01) C08G 18/22 (2006.01) C08G 18/65 (2006.01)
Patent
CA 2143566
A method whereby the properties, particularly the recrystallisation temperature, of thermoplastic polyurethane elastomers, particularly those suitable for processing by extrusion, are kept constant during continuous manufacture in screw-type extruding machines by continuously adding substantially straight-chain hydroxyl-terminated polyols having a molecular weight of 500 to 5000, organic diisocyanates and diol and optionally triol chain-lengthening agents having a molecular weight of 62 to 500, the molar ratio of polyols to chain-lengthening agents being 1 : 1 to 1 : 5, and by continuous addition of a catalyst, wherein the recrystallisation temperature is set at a value at least 2°C below the value for the corresponding TPU manufactured without a catalyst, and when the set recrystallisation temperature is exceeded, the amount of continuously supplied catalyst is increased, whereas when the value falls below, the amount is decreased so as to maintain the set value, the resulting elastomers and use thereof for extrusion.
Brauer Wolfgang
Heidingsfeld Herbert
Muller Friedemann
Schulte Bernhard
Winkler Jurgen
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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