Cellular structures and viscoelastic polyurethane foams

摘要

The present invention discloses a structure comprising a plurality of three dimensional cells, wherein each cell comprises exterior walls defining an interior void wherein the walls comprise a plurality of struts and windows, the struts forming borders for the plurality of windows, wherein the struts have a plurality of pores. The present invention further discloses a viscoelastic foam having a ratio of elastic modulus (E′) at 20° C. to 25% compression force deflection (CFD) of 25 to 125.

主权项

1. A polyol composition comprising:
a1) from 30 to 80 weight percent, based on a total weight of the polyol composition, of at least one polyoxypropylene or a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 100 and 2000 and an average nominal hydroxy functionality of 2-4, with the proviso if the polyol is a polyoxyethylene-polyoxypropylene polyol, the polyoxypropylene content is at least 70% by weight of the polyol; a2) from 5 to 50 weight percent, based on the total weight of the polyol composition, of a polyoxyethylene or a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 100 and 1000; and an average nominal hydroxy functionality of 2-4, with the proviso if the polyol is a polyoxyethylene-polyoxypropylene polyol, the polyoxyethylene content is at least 70% by weight of the polyol; and a3) from 1 to 20 wt %, based on the total weight of the polyol composition, of:
(i) a monol or blend of monols having an average equivalent weight of 500 or greater and comprising >60% by weight of a polyoxyalkylene, wherein the alkylene oxide contains 4 or more carbon atoms;(ii) a polyoxyalkylene polyol having a functionality of 2 to 4, an equivalent weight of 500 to 3000 wherein the alkylene oxide contains greater than 60% by weight of alkylene oxides having 4 or more carbon atoms;(iii) a polybutadiene having an equivalent weight of 2250 to 6000; or(iv) a combination thereof.