Patent ID: 9617370
Date: 2017-04-11
CPC Classifications: A61L,C08G,C08J,C08K

Claim:
1. A polyurethane for an external fixation system for orthopedics, the polyurethane being a polyether polyurethane prepared by a polymerization reaction using a polyether polyol mixture and a modified isocyanate as raw materials, the polyether polyol mixture comprising a polyether polyol, the polyether polyol comprising hydroxyl groups, the modified isocyanate comprising isocyanate groups at terminals of a molecular chain of the modified isocyanate, and the polymerization reaction being a reaction between the hydroxyl groups and the isocyanate groups to form urethane groups, wherein the polyether polyol mixture and the modified isocyanate as raw materials in the polymerization reaction have a weight ratio of 1:0.6-1:0.75; the polyether polyol mixture comprises ingredients in the following weight percentages with respect to the polyether polyol mixture: wherein the polyether polyol is selected from the following compounds: the modified isocyanate is prepared from polymerization reaction of polyether glycol with diphenylmethane diisocyanate (MDI) or with a polyphenylene polymethylene isocyanate.