Solid propellant compositions containing polyurethane resins of low cure temperature

Claim 1

A SOLID PROPELLANT COMPOSITION CONSISTING ESSENTIALLY OF A CURED INTIMATE MIXTURE OF A SOLID INORGANIC OXIDIZING SALT AND A CROSS-LINKED RESIN BINDER CONSISTING ESSENTIALLY OF THE REACTION PRODUCT OF A COMPOUND HAVING, AS ITS SOLE REACTING GROUPS, NOT LESS THAN TWO ACTIVE HYDROGEN GROUPS CAPABLE OF POLYMERIZING WITH A ISOCYANATE AND A STOICHIOMETRIC EXCESS OF A COMPOUND HAVING, AS ITS SOLE REACTING GROUPS, NOT LESS THAN TWO GROUPS CAPABLE OF UNDERGOING A URETHANE-TYPE REACTION WITH HYDROXY GROUPS, AND BEING SELECTED FROM THE GROUP CONSISTING OF: (1) ALKANE DIISOCYANATES; (2) ALKANE DIISOTHIOCYANATES; (3) ALKENE DISSOCYANATES; (4) ALKENE DIISOTHIOCYANATES; (5) ALKYLIDENE DIISOCYANATES; (6) ALKYLIDENE DIISOTHIOCYANATES; (7) CYCLOALKYLENE DIISOCYANATES; (8) CYCLOALKYLENE DIISOTHIOCYANATES; (9) CYCLOALKYLIDENE DIISOCYANATES; (10) CYCLOALKYLIDENE DIISOTHIOCYANATES; (11) CARBOCYLIC AROMATIC DIISOCYANATES; (12) CARBOCYCLIC AROMATIC DIISOTHIOCYANATES; THE STOICHIOMETRIC EXCESS BEING CALCULATED AS AN EXCESS OVER ALL ACTIVE HYDROGEN GROUPS CAPABLE OF POLYMERIZING WITH AN ISOCYANATE INITIALLY PRESENT, SAID SOLID INORGANIC OXIDIZING SALT BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 45 AND ABOUT 95 PERCENT BY WEIGHT OF THE PROPELLANT COMPOSITION AND SAID CROSSLINKED RESIN BINDER BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 55 AND ABOUT 5 PERCENT BY WEIGHT OF THE PROPELLANT COMPOSITION.