| 摘要 |
Solid poly-addition compounds containing isocyanate, uretedione, urethane and ester and/or carbonate groups, obtained by reacting uretedione group-containing isocyanates with ester and/or carbonate group-containing polyols other than neopentyl glycol esters of hydroxypivalic acid. Poly-addition compounds which are solid below 40 degrees C and liquid above 125 degrees C, showing (a) a free isocyanate group content of 2.1-6.0 wt% with an average NCO functionality of 2.0-8.0, (b) a uretedione group content (calculated as C2N2O2) of 10-19 wt%, (c) a urethane group content (-NHCOO-) of 10-17 wt% and (d) an ester and/or carbonate group content (COO and/or OCOO) of 1-17 wt%. These compounds are obtained by reacting uretedione group-containing isocyanates with ester and/or carbonate group-containing polyols other than neopentyl glycol esters of hydroxypivalic acid (NPGHP). An Independent claim is also included for a process for the production of these compounds by reacting (A) isocyanurate-free uretedione-polyisocyanates and optionally (B) up to 10 wt% other di-isocyanates (based on A + B) with (C) ester and/or carbonate group-containing polyhydroxy compounds with an average mol. wt. of 134-1200 other than NPGHP, and optionally with (D) up to 70 wt% (based on C + D) other polyhydroxy compounds with a mol. wt. of 62-400 containing no ester or carbonate groups and/or (E) up to 20 wt% (based on C + D + E) other mono-functional compounds which react with isocyanate groups, with an equivalent ratio of (NCO groups):(NCO-reactive groups) = (1.2:1)-(1.8:1) and with the reactants and their relative amounts chosen to give products with the properties listed above. |
