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Process for forming a liner and cast propellant charge in a rocket engine casing without separately precuring the liner, comprising the steps of providing a blocked curable liner composition which is the reaction product of a prepolymer, an isocyanate curing agent, and a blocking agent; applying the

Process for forming a liner and cast propellant charge in a rocket engine casing without separately precuring the liner, comprising the steps of providing a blocked curable liner composition which is the reaction product of a prepolymer, an isocyanate curing agent, and a blocking agent; applying the liner composition to an internal surface of a rocket casing; preheating the casing and liner assembly to simultaneously prepare the assembly for receiving a propellant, unblock the liner, and precure the liner to a tacky state; casting the propellant change into interfacial contact with the liner; and cocuring the liner and propellant compositions. The blocked, curable liner composition has a very long pot life which is terminated by heating the composition sufficiently to uncouple the blocking agent from the isocyanate curing agent and initiate a rapid cure. The liner composition does not require precuring, as it is unblocked by preheating the liner and rocket casing sufficiently to receive to cast propellant. The blocked liner composition has the following structure. [Figure] (5)

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A process for lining a rocket motor and casting a propellant charge within and an interfacial contact with said lining, comprising the steps of: a. providing a rocket casing having an internal surface; b. providing a blocked curable liner composition which is the reaction product of a prepolymer, an

A process for lining a rocket motor and casting a propellant charge within and an interfacial contact with said lining, comprising the steps of: a. providing a rocket casing having an internal surface; b. providing a blocked curable liner composition which is the reaction product of a prepolymer, an isocyanate curing agent, and a blocking agent; c. applying said liner composition to said internal surface, thereby forming a casing and uncured liner assembly; d. providing an uncured, castable propellant composition; e. preheating said assembly, thereby preparing it for receiving said propellant while simultaneously unblocking said liner and precuring said liner to a tacky state; f. casting said propellant within said precured liner; and g. cocuring said liner and propellant compositions.