Patent ID: 8349908

Claim:
A foamed material having a density of less than 100 kg/m 3 and comprising a matrix material comprising a plurality of urea groups and having a hardblock content of more than 50%, wherein the matrix is the reaction product of a diphenylmethane diisocyanate, comprising a homologue comprising 3 or more isocyanate groups, and water; and a polymeric material which 1) has no groups which are able to form a urethane, urea or isocyanurate group with an isocyanate group, 2) is interpenetrating said matrix, and 3) is a polymer having an average molecular weight of more than 500 wherein the polymer comprises at least 50% by weight of oxyethylene groups based on the weight of the polymer; and wherein the relative amount of all ingredients used to make said matrix and of said polymeric material, on a weight basis, ranges from 10:90 to 70:30.