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Liquid ferrocene derivatives increasing low pressure burning rate of solid propellant - prepared by reacting keto-mono or di carboxylic acid or acetyl-di carboxylic acid with alkyl-ferrocene and reducing to hydroxy-methyl compound.
: Menke, K.; Boehnlein Mauss, J.; Brehler, K.P.; Jungbluth, H.; Neitsch, H.

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DE 1996-19608627 A: 19960306
DE 1996-19608627 A: 19960306
EP 1997-103781 A: 19970306
EP 794192 B1: 20030219
Patent, Electronic Publication
Fraunhofer ICT ()

Ferrocene derivatives of formula (I) are new (where, X = hydrogen or hydroxyl; Y = H or CH2OH; Z = (CH2)s-CH2OH; R = linear or branched alkyl with 2-6 carbon (C) atoms; r = 0-8, preferably 0-2; s = 0-8, preferably 1 and 2). USE - (I) are useful e.g. as burning modifiers in solid fuels for rockets (claimed), especially composite fuels containing ammonium perchlorate, and gas generators. ADVANTAGE -Small amounts of (I) greatly increase the burning rate at low pressure and lower the pressure exponent from 0.5-0.6 to 0.1-0.4 for a fast-burning fuel. (I) do not migrate and can be synthesised much more easily than known non-migrating modifiers. They are liquids with a high Fe content, low viscosity and low vapour pressure.