Tri-functional isocyanate crosslinking agents for hydroxy-termin

Details Tri-functional isocyanate crosslinking agents for hydroxy-termin Tri-functional isocyanate crosslinking agents for hydroxy-termin

1976-12-06

1978-02-07

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 775AT, C07C119042, C07C119045, C07C119048

Patent

active

040727025

ABSTRACT:
By use of the reaction for the preparation of biurets from isocyanates (i, condensation products of isocyanates and water) a variety of tri-functional isocyanates are made available as the curing agents for rubbery-solid-filled compositions employing hydroxy-terminated polybutadiene (HTPB) binder to obtain beneficial binder chain extension and crosslinking functions.
The tri-functional isocyanates are prepared by the reaction of three moles of a diisocyanate selected from the diisocyanates consisting of dimeryl diisocyanate, isophorone diisocyanate, and trimethylhexamethylene diisocyanate with one mole of water in an appropriate solvent (e.g., p-dioxane). The reaction occurs at solvent reflux temperature. The reaction must be carried out under a blanket of dry nitrogen. The product, a triisocyanate, is obtained ready for use at the end of the reaction when the solvent is stripped from the reaction product. The product achieves improved mechanical properties for a composition containing high solids loadings of either inert ingredients or oxidizer and combustible ingredients depending on intended use for the composition.

REFERENCES:
patent: 3124605 (1964-03-01), Wagner
patent: 3896154 (1975-07-01), Takahashi et al.
patent: 3903127 (1975-09-01), Wagner et al.
patent: 4028392 (1977-06-01), Ogawa et al.

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