Process for the manufacture of thermoplastic polyurethanes

Details Process for the manufacture of thermoplastic polyurethanes Process for the manufacture of thermoplastic polyurethanes

1987-07-16

1988-09-06

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 60, 528 61, 528 65, 528 66, 528 75, 528 76, 528 77, 528 78, 528 80, 528 81, 528 83, C08G 1830

Patent

active

047694351

ABSTRACT:
The invention concerns a process for the manufacture of thermoplastic polyurethanes wherein an organic polyisocyanate is made to polymerize with a polyol (reactive with same isocyanate) in the presence of a chain extending agent having a molecular weight lower than 400, under continuous stirring, at a temperature higher than 150.degree. C. and for a time sufficient to obtain a product having a melt flow index lower than 25 g/10'.

REFERENCES:
patent: 4532316 (1985-07-01), Henn
DE-A-2549372, Continuous Polyurethane Elastomer Prepn. by Vioorous Kneading in Double Screw Extruder to Give Homogeneous Prod.
EP-A-0021323, (Corresponds to U.S. Pat. No. 4,286,080), Continuous Polyurethane-Urea Prepn. in Multiroller Extruder by Reacting Poly:ol, Poly:isocyanate and Water Present as Gas Phase.
DE-A-1964834, Polyurethane Elastomers Mfr by Direct Reaction in Extruder.
DE-A-2447368, Thermoplastic Polyurethane Elastomers Prepn. by Introducing Components into Extruder Inlet Zone, and Maintaining Definite Temp. Profile in Extruder.

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