Patent ID: 11970569
Assignee: TRONJEN MEDICAL TECHNOLOGY INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  A  B | IPC A  B  C

Claim 0:
1. A polyurethane foam sponge produced by the steps of:
a) providing a hydrophobic polyol which has six hydroxyl groups, and which is obtained by:
a-1) reacting a branched triol with a first diisocyanate to obtain a triisocyanate intermediate, and
a-2) reacting the triisocyanate intermediate with a hydrophobic polyether triol;

b) providing a hydrophilic diisocyanate obtained by reacting a second diisocyanate with a hydrophilic polyether diol;
c) reacting the hydrophobic polyol with the hydrophilic diisocyanate to obtain a prepolymer
which includes 3 to 6 isocyanate groups; and

d) mixing the prepolymer with a hydrophilic polyether polyol, a blowing agent, an end-capping agent, a reinforcing agent, and a catalyst to obtain the polyurethane foam sponge.