The shelf life of polyurethane polyol pre-blends containing halogenated olefins is extended by encapsulation of active components such as catalysts anti/or surfactants. The active component is encapsulated in a crystallizable or thermoplastic polymer. The encapsulated particles have a size of 2,800 microns or less and the active components are not significantly leaked out, particularly in the presence of halogenated olefins.

The shelf life of polyurethane polyol pre-blends containing halogenated olefins is extended by encapsulation of active components such as catalysts and/or surfactants. The active component is encapsulated in a crystallizable or thermoplastic polymer. The encapsulated particles have a size of 2,800 microns or less and the active components are not significantly leaked out, particularly in the presence of halogenated olefins.

A catalyst composition comprising at least one compound with a general formula I:

##STR00001## wherein A is NR.sup.3, R.sup.3 is C.sub.1-C.sub.8 linear or branched, x=0-6, n and m are each independently 1 to 6, R.sup.1 and R.sup.2 are each independently C.sub.2-C.sub.8 alkyl, and R.sup.4 and R.sup.5 are CH.sub.3 groups; or AO, x=0-6, n and m are each independently 1 to 6, R.sup.1 and R.sup.2 are each independently C.sub.2-C.sub.8 alkyl, and R.sup.4 and R.sup.5 are CH.sub.3 groups; or AO or NR.sup.3, R.sup.3 is C.sub.1-C.sub.8 linear or branched, and N(R.sup.1R.sup.4) and N(R.sup.2R.sup.5) each independently represent a C.sub.3-C.sub.7 ring amine moiety of the type:

##STR00002##