Heat-stabilized polyurethane elastomer

Details Heat-stabilized polyurethane elastomer Heat-stabilized polyurethane elastomer

1976-02-13

1978-03-28

Rzucidlo, Eugene C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 457SE, 260 75NB, 260 775SS, C08G 1824

Patent

active

040814297

ABSTRACT:
Heat stabilization of polyurethane elastomer catalyzed with organo-metallic catalyst is accomplished by adding a minor amount of elemental sulfur or sulfur-donor material to the liquid mixture of polyol and organic polyisocyanate at the time the catalyst is added. The sulfur remains inert during the polymerization reaction, and as long as the temperature of the cured elastomer does not exceed about 200.degree. F. When the temperature of the urethane exceeds 200.degree. F, the sulfur reacts with the catalyst to form a metallic sulfide, which results in the complete neutralization, or deactivation of the catalyst. Elimination of the organo-metallic catalyst prevents depolymerization of the urethane, and the urethane therefore remains solid at high temperatures for much longer periods of time than has heretofore been possible. The amount of sulfur required to deactivate will depend upon the metal content of the organo-metallic catalyst.

REFERENCES:
patent: 3222301 (1965-12-01), Dahm
patent: 3228909 (1966-01-01), Oddo
patent: 3542701 (1970-11-01), VAN Raamsdonk

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