Thermoplastic polyurethanes having a high heat stability, based

Details Thermoplastic polyurethanes having a high heat stability, based Thermoplastic polyurethanes having a high heat stability, based

1984-08-02

1985-06-04

Cockeram, Herbert S.

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 65, 528 74, C08G 1876, C08G 1832

Patent

active

045215820

ABSTRACT:
This invention relates to novel, thermoplastically processible, branched polyurethanes based on naphthylene-1,5-diisocyanate which have good heat stability and are obtained by the claimed process. In the first stage of the process long-chain polyols are reacted with a first diisocyanate which is any diisocyanate other than naphthylene-1,5-diisocyanate in substoichiometric NCO quantities to produce an OH prepolymer which is then lengthened with excess napthylene-1,5-diisocyanate and with a chain lengthening mixture of short-chain diols and triols and/or polyols in specific ratios. The resulting semi-rigid, thermoplastic polyurethane elastomers are characterized by their good dimensional stability under heat, a good rebound elasticity (even at relatively high temperatures), acceptable low temperature flexibility and an outstanding resistance to wear which properties render them useful for the production of hydraulic seals, seals, rollers, buffers, tubes, bellows, plugs, cylinders, couplings and similar moldings.

REFERENCES:
patent: 2879233 (1959-03-01), Pace
patent: 3769265 (1973-10-01), Groegler et al.
patent: 3875118 (1975-04-01), Meisert et al.
patent: 3963656 (1976-06-01), Meisert et al.
patent: 4330656 (1982-05-01), Groegler et al.
patent: 4413111 (1983-11-01), Markush et al.

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