1. Dialkoxy-titanium (IV)-acetylacetonates, characterised in that they contain 0.05 to 0.75 mol of a malonic acid dialkyl ester residue per g-atom of titanium in place of the acetylacetonate residue, with the malonic acid dialkyl ester residue being derived from malonic acid dialkyl esters of the formula ROOC-CR'R'-COOH in which R stands for like or unlike alkyl residues with 1 to 4 C-atoms and R' for H or R.
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