Solid propellent grains

Claim 1

A SHAPED SOLID PROPELLENT GRAIN COMPRISING A SELFOXIDANT, GAS-PRODUCING COMPOSITION HAVING AT LEAST ONE SURFACE INHIBITED AGAINST IGNITION BY A FIRST SOLID INHIBITOR COATING BONDED THERETO, SAID FIRST COATING CONSISTING ESSENTIALY OF A CURED MIXTURE OF A REACTIVE LIQUID EPOXY POLYMER AND A LIQUID POLYAMIDE CONTAINING REACTIVE AMINO GROUPS, CONTAINING EMBEDDED THEREIN AS AN INTERAL PORTION THEREOF AT LEAST ONE LAYER OF A POROUS SHEET CONSISTING ESSENTIALLY OF AN ORGANIC POLYMERIC MATERIAL AND BEING OF SUFFICIENT THICKNESS TO PROVIDE SUBSTANTIAL HEAT INSULATION, SAID ORGANIC PPOLYMERIC MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF POLYAMIDE, POLYACRYLONITRILE, POLYACRYLATE ESTER, POLYMETHACRYLATE ESTER, POLYESTER, POLYETHYLENE, CELLULOSE ESTER, CELLULOSE ETHER, POLYVINYL, COTTON, AND RAYON, AND A SECOND SOLID INHIBITOR COATING, BONDED TO THE EXTERIOR SURFACE OF SAID FIRST INHIBITOR COATING, AND CONSISTING ESSENTIALLY OF AN ORGANIC POLYMER BINDER CONTAINING DISPERSED THEREIN AT LEAST ABOUT 1% BY WEIGHT OF A PARTICELATE, INERT, SOLID FILLER HAVING A LOWER THERMAL CONDUCTIVITY THAN THAT OF THE POLYMER BINDER, SAID FIRST COATING BEING FREE FROM SUCH FILLER.