Method for making urethane-terminated polycarbodiimides and prod

Details Method for making urethane-terminated polycarbodiimides and prod Method for making urethane-terminated polycarbodiimides and prod

1977-02-24

1978-02-28

Thomas, Jr., James O.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

260 25BF, 260 775AT, 260 4585N, C07C10144

Patent

active

040769453

ABSTRACT:
This invention concerns a method of making a urethane-terminated polycarbodiimide and the product resulting therefrom wherein the product displays unique hydrolytic degradation stabilization properties for polyester urethane rubbers and peroxide cured hydrocarbon rubbers. The method involves reacting an arylene diisocyanate with a stoichiometric deficiency of a primary or secondary aliphatic alcohol containing no other isocyanate-reactive substituents, thereby converting less than all of the isocyanate groups to urethane groups, and thereafter admixing thereto a carbodiimide-forming catalyst to polymerize the unconverted isocyanate groups and form the urethane-terminated polycarbodiimide.

REFERENCES:
patent: 2941966 (1960-06-01), Campbell
patent: 2969386 (1961-01-01), McElroy
patent: 3115479 (1963-12-01), Windemuth
patent: 3502722 (1970-03-01), Neumann
patent: 3969288 (1976-07-01), Cenker et al.

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