| abstract |
Prodn. of foam mouldings with compact surface and cellular corer comprises foaming a mixt. of polyisocyanate polyol, blowing agent, activator, etc. in a closed mould, in which (a) an aliphatic cycloaliphatic polyisocyanate is used, and (b) the activator system is a combination of (i) an amidine or imidazole, and (ii) a known meal catalyst for accelerating isocyanate addn. reactions. Used in mass prodn. of lightweight components for furniture, vehicles, window profiles, bumbers, shoe soles, etc.. The mouldings are more resistant to weather and to yellowing on exposure to light than those from usual aromatic polyisocyanates, while the activator system provides adequate reaction rates for prodn. of integral foam mouldings. |