| 摘要 |
Disclosed is a polyurethane foam composition based on polyisocyanates comprising initially at least 20 wt % mMDI and at most 24.5 wt % mTDI, a towards isocyanate polyfunctional and a towards isocyanate monofunctional compound, which composition contains
a) less than 1.00 wt % residual free mMDI,b) at least 0.4 wt % total of mMDI of which at least one isocyanate group has been reacted with a monofunctional compound,c) wherein the polyurethane prepolymer composition is having an isocyanate index of at least 105 and at most 350,d) wherein the equivalents ratio of functional groups of the monofunctional compounds relative to the amount of the isocyanate functional groups initially present is at least 6.5%, ande) wherein the equivalents ratio of towards isocyanate tri- and higher functional reactive compounds relative to the isocyanate functional groups initially present is at most 6.50%.
Further disclosed is a suitable prepolymer, production methods and uses. |
