The invention provides an improved spandex that is prepared from a polyurethane that is the reaction product of organic diisocyanates, polymeric glycols, and polyols that have an aromatic functionality, such as alkoxylated phenols. The spandex has improved resistance to high temperature dyeing with minimal loss of physical properties, such as elastic recovery.
RELATED APPLICATIONS
This application claims priority to U.S. Provisional Application No. 60/307,154 filed Jul. 24, 2001, the disclosure of which is incorporated by reference herein in its entirety.
A compatibilizing agent is described for a mixture of(1) a polyester polyol containing units derived from at least one aliphatic dicarboxylic acid (A) having n carbon atoms (10.ltoreq.n.ltoreq.20) and at least one aliphatic diol having k carbon atoms (2.ltoreq.k.ltoreq.12) and (2) a polyester polyol containing units derived from at least one aliphatic dicarboxylic acid (B) having m carbon atoms (2.ltoreq.m.ltoreq.9) and at least one aliphatic diol having k carbon atoms (2.ltoreq.k.ltoreq.12), the compatibilizing agent containing a polyester polyol which contains units derived from at least one aliphatic dicarboxylic acid (A) having n carbon atoms (10.ltoreq.n.ltoreq.20), at least one aliphatic dicarboxylic acid (B) having m carbon atoms (2.ltoreq.m.ltoreq.9), and at least one aliphatic diol having k carbon atoms (2.ltoreq.k.ltoreq.12) and in which the ratio of ingredient (A) to ingredient (B) used is from 90:10 to 10:90 in terms of molar ratio (provided that n-m.gtoreq.4).
