SOLVENT FREE POLYISOBUTYLENE BASED POLYURETHANES

摘要

A biocompatible polyisobutylene urethane, urea, and urethane/urea copolymer including hard segments, soft segments and that is free of urethane, urea or urethane/urea solvents. The hard include diisocyanate residue. The soft segments include at least one polyisobutylene diol or diamine and optionally a polyether diol.

主权项

1. A method of manufacturing a polyisobutylene urethane, urea or urethane/urea copolymer, the method comprising:
reacting hard segment components and soft segment components in a compounding extruder at a temperature of about 250 degrees Celsius or less in the absence of urethane, urea or urethane/urea solvents to produce the polyisobutylene urethane, urea or urethane/urea copolymer; and extruding the polyisobutylene urethane, urea or urethane/urea copolymer, wherein the soft segment components are present in an amount of about 40% to about 70% by weight of the biocompatible polyisobutylene urethane, urea or urethane/urea copolymer and comprise at least one polyisobutylene diol or diamine and optionally a polyether, and wherein the hard segment components are present in an amount of about 30% to about 60% by weight of the biocompatible polyisobutylene urethane and comprise diisocyanate residue.