Patent ID: 11920541
Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 10:
11. A method of lining a rocket motor, comprising:
applying a precursor formulation of a liner to a rocket motor, the precursor formulation of the liner comprising:
a liner polymer;
a curative formulated to react with the liner polymer; and
a blocked curative formulated to be substantially unreactive with the liner polymer, the blocked curative comprising an isocyanate compound that has been pre-reacted with a blocking agent to substantially prevent the isocyanate compound from reacting with the liner polymer at room temperature;

reacting the liner polymer with the reactive curative to form a liner;
applying a precursor formulation of a propellant to the liner;
removing the blocking agent from the isocyanate compound of the blocked curative at an elevated temperature to generate a reactive isocyanate curing agent; and
reacting a propellant polymer of the precursor formulation of the propellant with the reactive isocyanate curing agent.