C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/04 (2006.01) C08G 18/32 (2006.01) C08G 18/65 (2006.01) C08G 18/72 (2006.01) C08L 83/04 (2006.01)
Patent
CA 2650697
Thermoplastic polyurethanes and molding compositions containing the same having improved surface resistance (writing and scratch resistance) and good industrial processability, and the use thereof, such polyurethanes prepared by reacting: (a) one or more organic diisocyanates; (b) a chain extender comprising at least one low molecular weight polyol having on average at least 1.8 and not more than 3.0 Zerewitinoff-active hydrogen atoms and a number-average molecular weight M n of 60 to 400 g/mol; and (c) at least one polyol component having a number-average molecular weight M n of 450 to 10,000 g/mol and on average from at least 1.8 to not more than 3.0 Zerewitinoff-active hydrogen atoms; wherein the ratio of the number of isocyanate groups in component (a) to the number of isocyanate-reactive groups in components (b) and (c) is 0.9:1 to 1.1:1; in the presence of (d) a mixture of polyorganosiloxanes of the general formula (R2SiO)n, in an amount of 0.4 to 10 wt.% based on the thermoplastic polyurethane, wherein each R independently represents an organic hydrocarbon radical having 1 to 27 carbon atoms which can be linear and/or branched, and n represents an integer of 3 to 6000, wherein the mixture consists of (d1) 0.2 to 2 wt.%, based on the thermoplastic polyurethane, of one or more polyorganosiloxanes (R2SiO)n wherein n = 3 to 300 and (d2) 0.2 to 8 wt.%, based on the thermoplastic polyurethane, of one or more polyorganosiloxanes (R2SiO)n wherein n = 1000 to 6000.
Broich Markus
Peerlings Henricus
Shafiq Faisal
Winkler Juergen
Bayer Materialscience Ag
Fetherstonhaugh & Co.
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