Title: Composite propellant with surface having improved strain capacity

Abstract: The invention is based on the discovery that when at least a part of the initial burning surface of an epoxy cured carboxy terminated rubber type composite propellant is coated with a propellant antioxidant material, an increase in resistance to oxidative hardening and an increase in strain capability is imparted to said surface. The invention provides (1) such a composite propellant coated at an initial burning surface with a propellant antioxidant in an amount sufficient to impart those unexpected improvements, (2) method involving coating the burning surface with the requisite amount of the propellant antioxidant material, and (3) a propellant rocket motor containing the above said propellant. When only a portion of the surface is subject to high strain, e.g. in slot areas, it is sufficient that only that portion of the burning surface be coated.

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Inventors: Elrick, Donald E. (Rawlings, MD, US)
Gilbert, Harry (Cumberland, MD, US)

Application Number: 781285
Filing Date: 1968-12-04
Publication_date: 1980-12-30
Assignee: Hercules Incorporated (Wilmington, DE)
Primary Class(es): 102/290 102/285, 149/19.6, 149/19.9, 149/19.91
Other Classes:
US Patent Ref:

3147161	Sep, 1964	Abere et al.	149/19.
3177190	Apr, 1965	Hsieh	260/94.
3305523	Feb, 1967	Burnside	149/19.
3417059	Dec, 1968	Hoffman	149/19.

Other Refs:
Primary Examiner: Miller, Edward A.
Assistant Examiner:
Attorney: Deming; Hazel L., Keehan; Michael B.