Process for the manufacture of polyurethane resin for electrosta

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

1984-04-09

1985-06-18

Schofer, Joseph L.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Utilizing electrical energy

264 24, 524233, 524364, B29C 600, B29C 2300

Patent

active

045240361

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.degree. 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.

REFERENCES:
patent: 2843568 (1958-07-01), Benning et al.
patent: 3189578 (1965-06-01), Kuemmerer
patent: 3483167 (1969-12-01), Sommer et al.
patent: 3635907 (1972-01-01), Schulze et al.
patent: 4043331 (1977-08-01), Martin et al.

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