| 摘要 |
Reaction product of an aliphatic or cycloaliphatic diisocyanate, a poly-tetra methylene ether glycol and 1,4 butane diol. The diisocyanate is selected from hexamethylene diisocyanate, isophorone diisocynate, trimethylhexamethylene diisocyanate, dicyclohexylmethane diisocyanate and dimer acid diisocyanate. The polytetramethylene ether glycol generally has a molecular weight of 500 to 5000. The resulting polymers have thromboresistant properties, a long flexural life and are extrudable. The polyurethane polymer is ideal for forming transvenous cardiac pacemaker leads, blood bags, intravenous and intra- arterial catheters and tubing, and other shaped devices which must be formed of a blood compatible material. |
