Patent KR-20040018151-A (KR)
Inventor: PEERLINGS HENRICUS
IPC: C08G18/38
Filed: 2003-08-20
Abstract: PURPOSE: Thermoplastically processable polyurethane elastomers(TPU) with tensile strengths of >35 MPa (measured in accordance with EN ISO 527-3), with shrinkages of less than 3% and with self-extinguishing properties based on the use of at least one flameproofing agent which can be built in, a process for their preparation and their use are provided. CONSTITUTION: In a thermoplastically processable polyurethane elastomer(TPU) having a tensile strength of larger than 35 MPa (measured in accordance with EN ISO 527-3), with shrinkages of less than 3% and with self-extinguishing properties, the thermoplastically processable polyurethane elastomer comprises the reaction product of: (1) a prepolymer containing NCO groups which comprises the reaction product of (A) at least one organic diisocyanate, and (B) at least one polyol having on average at least 1.8 and not more than 3.0 Zerewitinoff-active hydrogen atoms and a number-average molecular weight {overscore (M)}n of 450 to 10,000; with (C) at least one low molecular weight polyol or polyamine having on average at least 1.8 and not more than 3.0 Zerewitinoff-active hydrogen atoms and a number-average molecular weight {overscore (M)}n of 60 to 400 as a chain lengthener; and (D) from 1 to 15 wt.%, based on the total weight of the TPU, of at least one organic phosphorous-containing compound selected from the group consisting of phosphonates and phosphine oxides having on average at least 1.5 and not more than 3.0 Zerewitinoff-active hydrogen atoms and a number-average molecular weight {overscore (M)}n of 60 to 10,000 corresponding to the following structural formulae 1. In formula 1, R1 and R2 may be the same or different, and each independently represents a branched or unbranched alkylene radical having 1 to 24 carbon atoms, a substituted or unsubstituted arylene radical having 6 to 20 carbon atoms, a substituted or unsubstituted aralkylene radical having 6 to 30 carbon atoms, or a substituted or unsubstituted alkarylene radical having 6 to 30 carbon atoms; R3 represents a hydrogen atom, a branched or unbranched alkyl radical having 1 to 24 carbon atoms, a substituted or unsubstituted aryl radical having 6 to 20 carbon atoms, a substituted or unsubstituted aralkyl radical having 6 to 30 carbon atoms, or a substituted or unsubstituted alkaryl radical having 6 to 30 carbon atoms; and x and y each independently represents a number from 1 to 50. In Formula 2, R1 represents a hydrogen atom, a branched or unbranched alkyl radical having 1 to 24 carbon atoms, a substituted or unsubstituted aryl radical having 6 to 20 carbon atoms, a substituted or unsubstituted aralkyl radical having 6 to 30 carbon atoms, or a substituted or unsubstituted alkaryl radical having 6 to 30 carbon atoms; R2 and R3 may be the same or different, and each independently represents a branched or unbranched alkylene radical having 1 to 24 carbon atoms, a substituted or unsubstituted arylene radical having 6 to 20 carbon atoms, a substituted or unsubstituted aralkylene radical having 6 to 30 carbon atoms, or a substituted or unsubstituted alkarylene radical having 6 to 30 carbon atoms and, optionally, in the presence of: (E) one or more catalysts; (F) from 0 to 70 wt. %, based on the total weight of the TPU, of at least one further flameproofing agent which contains no Zerewitinoff-active hydrogen atoms and has a number-average molecular weight {overscore (M)}n of 60 to 10,000; and/or (G) 0 to 20 wt. %, based on the total weight of the TPU, of further auxiliary substances and additives; wherein the Isocyanate Index ranges from 85 to 120.