Thermoplastic polyurethane elastomers and polyurea elastomers ma

Details Thermoplastic polyurethane elastomers and polyurea elastomers ma Thermoplastic polyurethane elastomers and polyurea elastomers ma

1990-11-02

1992-03-17

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 64, 528 65, 528 66, 528 76, C08G 1822

Patent

active

050969935

ABSTRACT:
This invention relates to a method of fabricating a thermoplastic elastomer which comprises the steps of: (a) fabricating a polyol having a molecular weight of between about 2,000 and about 20,000 and having a level of end group unsaturation of no greater than 0.04 milliequivalents per gram of polyol, said polyol being fabricated in the presence of a double metal cyanide catalyst, (b) reacting said polyol with a diisocyanate to produce an isocyanate-terminated prepolymer, and (c) reacting said isocyanate-terminated prepolymer with a difunctional isocyanato-reactive chain extender in a mold or in an extruder in order to produce a soft elastomer characterized by a Shore A hardness of between about 10 and about 70. Also claimed is the elastomer produced by the above method utilizing a one-shot technique.

REFERENCES:
patent: 3829505 (1974-09-01), Herold et al.
patent: 4202957 (1990-05-01), Bonk et al.
patent: 4242490 (1980-12-01), Emerson et al.
patent: 4376834 (1983-03-01), Goldwasser et al.

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