Flexible polyurethane foam prepared from a novel polyisocyanate mixture

Abstract

The present invention is directed to a novel isocyanate mixture and the use thereof in producing a flexible polyurethane foam. The polyisocyanate mixture comprises (a) for 73 to 77% by weight of methylene bis(phenylisocyanate), said methylene bis(phenylisocyanate) having an isomer content as follows: (i) from about 30 to about 34% by weight of the 2,4' isomer, (ii) from about 60 to about 66% by weight of the 4,4'- isomer, and (iii) from about 3 to about 7% by weight, the 2,2' isomer, the percent of said isomers totaling 100% (b) from 23 to 27% by weight of higher functional methylene-bridged polyphenyl polyisocyanates, the percents of components (a) and (b) totaling 100%, and wherein said polyisocyanate mixture has an isocyanate group content of from about 30 to about 33.5 percent by weight.

Dependencies are inferred from the claim text.