Process for the production of PUH elastomer threads and films re

Details Process for the production of PUH elastomer threads and films re Process for the production of PUH elastomer threads and films re

1990-09-21

1992-02-04

Kight, III, John

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 25, 528 28, 528 45, 528 75, 521187, C08G 1830

Patent

active

050861506

ABSTRACT:
This invention relates to a process for the production of light resistant and exhaust gas resistant PUH elastomer threads and films based on segmented polyurethane ureas which are based on diisocyanate mixtures of from 30 to 85 mol% of trans-1,4-cyclohexylene diisocyanate and from 70 to 15 mol% of other aliphatic or cycloaliphatic diisocyanates. The diisocyanates are first reacted with relatively high molecular weight dihydroxy compounds and optionally low molecular weight diols to form an isocyanate prepolymer which is then reacted with aliphatic diamines or diamine mixtures, preferably ethylene diamine, in highly polar solvents, optionally in the presence of salt type solubilizing agents such as lithium salts and preferably with the aid of aliphatic chain terminators, in particular those having a cycloaliphatic structure, to produce elastomer solutions which are stable under processing conditions. These solutions are spun in the conventional manner or dried to form films or coagulated to form sheet products.
The invention also relates to the segmented polyurethane urea elastomers, in particular threads, obtainable by the new process.

REFERENCES:
patent: 3645976 (1972-02-01), Suzuki et al.
patent: 4071505 (1978-01-01), Meckel et al.
patent: 4098772 (1978-07-01), Bonk et al.
patent: 4195132 (1980-03-01), Sundermann
patent: 4820743 (1989-04-01), Ishikawa et al.
patent: 5032664 (1991-07-01), Frauendorf et al.
CELLULAR POLYMERS, 6:1; 29-36 (1987).

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