Fulvene binder compositions

A molding composition which comprises a major amount of aggregate and an effective bonding amount up to about 40% by weight of the aggregate of a composition capable of curing in the presence of oxygen containing a fulvene of the formula:

• ##STR6## wherein each R.sub.1 and R.sub.2 individually is hydrogen or a hydrocarbon containing 1 to 10 carbon atoms, or a hydrocarbon containing one or more oxygen bridges in the chain;
• or a furyl group;
• or are interconnected to form a cyclic group, each R.sub.3 and R.sub.6 individually is hydrogen or methyl, each R.sub.4 and R.sub.5 is hydrogen or methyl or ##STR7## provided that a maximum of only one such R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is methyl and provided that a maximum of any one such R.sub.4 and R.sub.5 is ##STR8## or prepolymer thereof or mixtures thereof;
• and a catalytic amount of a metal salt of a carboxylic acid catalyst wherein the metal constituent of said salt of a carboxylic acid is capable of existing in at least two valence states.