Process for the manufacture of polyurethane resin for...

Details Process for the manufacture of polyurethane resin for... Process for the manufacture of polyurethane resin for...

D - Textiles, Paper

01

D

18/500

D01D 5/26 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) D04H 1/56 (2006.01)

Patent

CA 1203357

-11- PROCESS FOR THE MANUFACTURE OF POLYURETHANE RESIN FOR ELECTROSTATIC SPINNING Abstract A process for the preparation of polyurethane resins particularly suitable for electrostatic spinning which comprises forming a prepolymer of polyether glycol and a diisocyanate reacted in a molar ratio of about 1:2, and thereafter reacting the prepolymer with additional diisocyanate and a diol extender, the final molar ratio of the polyether, isocyanate and diol reactants being approximately 1:3.7:2.5. The reaction is conducted in an organic solvent at a temperature of about 45°C. to obtain a polymer having an inherent viscosity of from about 2.0 to 2.4 in a solution of 25 to 30 percent solids. The solution is diluted to about 15 percent solids prior to spinning.

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