C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 71/04 (2006.01) C08G 18/10 (2006.01) C08G 71/02 (2006.01) D01F 6/70 (2006.01) D01F 6/72 (2006.01)
Patent
CA 2529696
Segmented polyurethane/ureas useful in the production of spandex with improved heat set are produced by chain extending an isocyanate- terminated prepolymer with a diamine chain extender that includes: (1) greater than 25 to 75 equivalent percent of an asymmetric aliphatic and/or cycloaliphatic diamine and (2) a linear diamine such as ethylene diamine in the presence of a solvent. The isocyanate-terminated prepolymer having an isocyanate group content of from about 2.25 to about 4 is produced by reacting a stoichiometric excess of an isocyanate with an isocyanate-reactive component that includes: (1) from about 25 to about 75 equivalent percent of a polyoxypropylene diol having a molecular weight in excess of 1500 Da and an average unsaturation level of less than about 0.03 meq/g and (2) from about 25 to about 75 equivalent percent of a polytetramethylene ether glycol having a molecular weight of at least 600 Da.
Lane Roger Dale
Lawrey Bruce D.
Rebello Robert F.
Smith W. Brent
Bayer Materialscience Llc
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Radicispandex Corporation
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