Crosslinkable polyolefin composition comprising silane groups forming an acid or a base upon hydrolysation

A polyolefin composition comprising

• (i) a crosslinkable polyolefin with hydrolysable silane groups, and
• (ii) a non-polymeric compound with hydrolysable silane groups which upon hydrolysation form an acid or a base,
• characterised in that the acid or base generates a gel content of at least 40% after 40 hours in the 90° C. cross-linking test, wherein the acid or base is added in an amount of 4.5 mmol/kg to an ethylene/vinyltrimethoxysilane copolymer with a MFR2=2 g/10 min, a density of 923 g/cm3, and 2 wt. % of vinyltrimethoxysilane and then is cross-linked in a waterbath at 90° C.

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A method for forming a silanol condensation catalyst by hydrolysing a crosslinkable polyolefin with hydrolysable silane groups to form an acid or a base which acts in hydrolysed form as a silanol condensation catalyst.

A method for forming a silanol condensation catalyst by hydrolysing a non-polymeric compound with hydrolysable silane groups to form an acid or a base which acts in hydrolysed form as a silanol condensation catalyst.

A method for forming a scorch retarding agent by hydrolysing a non-polymeric compound with hydrolysable silane groups to form an acid or a base which acts in hydrolysed form as a scorch regarding agent.