Process for polyesterurethaneurea thin-walled articles

A process for making a thin-walled elastic article comprising, in sequence:

• preparing a polyesterurethaneurea by
• reacting methylene-bis-(4-phenyl-isocyanate) with a polyester diol to form an isocyanate-capped prepolymer having a %NCO in the range of 1.4 to 2.0 weight %, the polyester diol having been derived from the reaction of adipic acid with a mixture of ethylene glycol (2G) and 1,4-butanediol (4G) in the weight ratio of 2G/4G in the range of 20:80 to 80:20 and having a number average molecular weight in the range of 3,000 to 5,000, and
• chain-extending the prepolymer with a diamine being selected from the group consisting of ethylene diamine, 1,3-diaminocyclohexane, 1,2-diamino-propane, 1,3-diaminopropane and metaxylylene diamine;
• forming a solution of the polyesterurethaneurea in an organic solvent for the polyesterurethaneurea at a polyesterurethaneurea concentration of 12 to 20%, based on total solution weight, the solution having a viscosity, measured at 30.degree. C., in the range of 25 to 125 poises;
• optionally, degassing the thusly formed solution;
• dipping a mandrel into the solution;
• removing the mandrel from the solution, thereby forming a solution-coated mandrel;
• drying the coated mandrel;
• and
• removing the resultant dried thin-walled article of polyesterurethaneurea from the mandrel.