| abstract |
The shelf life of polyurethane polyol preblends containing halogenated olefins is extended by encapsulating active ingredients such as catalysts and / or surfactants. The active ingredient is encapsulated in a crystalline or thermoplastic polymer. The encapsulated particles have a size of 2,800 microns or less and their active ingredients do not leak significantly, especially in the presence of halogenated olefins. |