The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1978
Filed:
Dec. 06, 1976
Chester W Huskins, Huntsville, AL (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
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.