SHELF LIFE OF POLYOL BLENDS CONTAINING HALOGENATED OLEFINS BY ENCAPSULATION OF ACTIVE COMPONENTS

摘要

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.

主权项

1. A polyol, polyisocyante or isocyante foam formed from a foam premix which exhibits prolonged shelf-life/stability comprising a polyol, polyisocyante or isocyante foam froming component; a surfactant encapsulated in an encapsulating agent; a catalyst encapsulated in an encapsulating agent; a halogenated hydroolefin blowing agent; a carbon dioxide generating agent; and optionally an ester.