Patent ID: 6389602
Filing Date: 2002-05-21
Classification: A61F,C08G,Y10T

Abstract:
A thin-walled elastic article made of a linear polyurethane having physical properties close to those of natural rubber, wherein the article is made of a linear polyurethane which comprises the reaction product of an &agr;,&ohgr;-dihydroxy polyol selected from poly(propylene glycol)s, said polyol containing no more than 0.01 milliequivalents unsaturation per gram; an aliphatic diisocyanate; and a chain extender; said polyurethane having a ratio of hard:soft segments from 20:80 to 40:60, a number average molecular weight (Mn) of from 90 to 150 kg/mole and a ratio of average molecular weight (Mw) to Mn of from 1.2 to 2.2; and wherein the said film has an S100 of less than 2.0 MPa, an elongation at break of at least 800% and a tensile strength of above 15 MPa.