The present patent application relates to new metal complexes having at least one N-aminoguanidinate ligand. The patent application further relates to the preparation of the new metal complexes and also to their use. The new metal complexes are especially suitable as precursors for the preparation of functional layers by means of gas-phase thin-film processes such as CVD, MO-CVD, MOVPE and ALD. Additionally, they are also suitable as catalysts for olefin hydroamination and for olefm polymerization.

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A rubber composition for a golf ball core includes (a) a conjugated diene polymer, (b) a multi-component copolymer having conjugated diene units, non-conjugated olefin units and aromatic vinyl units, and (c) an organic peroxide. The conjugated diene units include butadiene units, the non-conjugated olefin units include ethylene units, and the aromatic vinyl units include styrene units. The content of conjugated diene units with respect to the multi-component copolymer is at least 5 wt %. Golf balls having at least one core layer formed of such a rubber composition and a cover of one or more layers encasing the core exhibit improved durability to cracking on repeated impact while maintaining the basic properties required of golf balls, such as flight and spin controllability on approach shots.

The present patent application relates to new metal complexes having at least one N-aminoguanidinate ligand. The patent application further relates to the preparation of the new metal complexes and also to their use. The new metal complexes are especially suitable as precursors for the preparation of functional layers by means of gas-phase thin-film processes such as CVD, MO-CVD, MOVPE and ALD. Additionally, they are also suitable as catalysts for olefin hydroamination and for olefin polymerization. ##STR00001##