| 摘要 |
A binder suitable for use as a lubricant for enamalled wires based on aliphatic monocarboxylic acids, polyisocyanates, polycarboxylic acids and/or polyalcohols, where the binder is a block polymer having free and/or blocked isocyanate groups, which can be prepared from: A aliphatic, saturated or unsaturated, linear or branched monocarboxylic acids having 15 to 50 carbon atoms, B aromatic and/or aliphatic polyisocyanates having at least 2 isocyanate groups, C aromatic and/or aliphatic polycarboxylic acids having at least 2 carboxyl and/or anhydride groups, D aromatic and/or aliphatic polyisocyanates having at least 2 isocyanate groups which may be the same as or different from B, E polyalcohols having at least 2 hydroxyl groups, and F aromatic and/or aliphatic polyisocyanates having at least 2 isocyanate groups which may be the same as or different from B and D, in which the individual components are in the form of a structural block comprising A and B, a structural block comprising C and D and a structural block comprising E and F, and the structural block comprising A and B and at least one of the structural blocks comprising C and D or E and F must be present or both structural blocks C and D and E and F may be present, in which the composition of the block polymer corresponds to the following definition: (f+g)/h=0.5 to 1.0 i/(h-f-g)=2.0 to 25.0 a/(c+e)=0.1 to 1.0 where a = total moles of A, c = total moles of C, e = total moles of E, f = total equivalents of hydroxyl groups, g = total equivalents of carboxyl and anhydride groups, h = total equivalents of isocyanate groups, i = total moles of A to F. |
