Process for the production of segmented polyurethane urea elasto

Details Process for the production of segmented polyurethane urea elasto Process for the production of segmented polyurethane urea elasto

1990-09-21

1991-07-16

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 80, 521155, 525434, 525457, C08G 1830

Patent

active

050326643

ABSTRACT:
The invention relates to a process for the production of highly concentrated and, surprisingly, viscosity-stable solutions of segmented polyurethane urea elastomers in highly polar solvents, such as dimethyl formamide and dimethyl acetamide, having little or no tendency to turn to paste, characterized by the use of certain primary and secondary cycloaliphatic monoamines or cycloaliphatic monisocyanates as chain-extending agents/blocking agents in the reaction of NCO prepolymers based on relatively high molecular weight dihydroxy compounds and (preferably aromatic) diisocyanates with aliphatic and and/or cycloaliphatic diamine chain-extending agents. The chain terminators according to the invention also show unexpected iprovements in the color of the elastomer solution and also in the stability of the end products, preferably filaments, to light and noxious gases.
The invention also relates to elastomers of corresponding composition containing special terminators, preferably in the form of filaments, films or coatings showing improved stability to light and waste gases.

REFERENCES:
patent: 4071505 (1978-01-01), Meckel et al.
patent: 4098772 (1978-07-01), Bonk et al.
patent: 4195132 (1980-03-01), Sundermann et al.
patent: 4393186 (1983-07-01), Damico et al.

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