Jun 24, 2025

US12337511 - Combustible containers manufactured using reactive injection molding of azido polymers

Small-, medium-, and large-caliber combustible cartridge cases and propellant combustible containers that are manufactured using reactive injection molding of azido polymers. An injection process for a single propellant combustible charge including the steps of: providing a quantity of azido bearing polymer; providing a quantity of curing agent; optionally providing a quantity of chemical blowing agent; optionally providing a quantity of fibers; optionally providing a quantity of additives and catalysts; and providing a mold defining a male cavity, a female cavity, and an injection port. The injection process further includes mixing together the azido bearing polymer, the curing agent, the optional chemical blowing agent, the optional fibers, the optional additives and catalysts, and injecting the resulting mixture into the mold.

Assignee: General Dynamics Ordnance and Tactical Systems—Canada Inc
Inventors: Etienne Comtois, Charles Dubois, Pierre-Yves Paradis
Filing date: 2023-11-17

This patent describes a method for manufacturing combustible cartridge cases and propellant containers using reactive injection molding of azido polymers. The process involves mixing azido bearing polymers with curing agents and optional additives, then injecting the mixture into a mold to create thermoset parts.

Claim 1

An injection process for a combustible foam thermoset part, comprising: providing a quantity of an azido bearing polymer; providing a quantity of a propargyl bearing curing agent; providing a mold defining a male cavity, a female cavity, and an injection port; mixing together the azido bearing polymer and the propargyl bearing curing agent to form a curable thermoset composition; adding a foaming agent to the curable composition; and injecting the resulting mixture into the mold, thereby preparing a combustible foam thermoset part. providing a quantity of an azido bearing polymer; providing a quantity of a propargyl bearing curing agent; providing a mold defining a male cavity, a female cavity, and an injection port; mixing together the azido bearing polymer and the propargyl bearing curing agent to form a curable thermoset composition; adding a foaming agent to the curable composition; and injecting the resulting mixture into the mold, thereby preparing a combustible foam thermoset part.

Google Patents

https://patents.google.com/patent/US12337511

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12337511