| http://www.w3.org/ns/prov#value | - A preferred group of amino compounds consists of polyamines, especially alkylene polyamines conforming for the most part to the formula ##STR1## wherein n is an integer preferably less than about 10, A is a hydrocarbon-based substituent or hydrogen atom, and the alkylene radical is preferably a lower alkylene radical of up to 7 carbon atoms.
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