Patent ID: 8846844

Claim:
A polyolefin composition comprising (i) a crosslinkable polyolefin with hydrolysable silane groups, the crosslinkable polyolefin being prepared from a hydrolysable silane compound represented by Formula (II): CH 2 ═CHSi(OA) 3 (II) wherein A is a hydrocarbyl group having 1-8 carbon atoms; and (ii) a non-polymeric compound with hydrolysable silane groups which upon hydrolysation form an acid or a base, wherein the non-polymeric compound has 50 repeating units or less, and is represented by Formula (III): R 1 SiR 2 R 3 R 4 (III) wherein R 1 is a non-hydrolysable hydrocarbyl group which comprises 2 to 30 carbon atoms, which further comprises at least one unsaturated group, and optionally contains heteroatoms; and R 2 , R 3 , and R 4 are organic residues which may be the same or different from each other with the proviso that at least one thereof is an acyloxy group that will generate a carboxylic acid upon hydrolysation or is an amino group that will generate an amine upon hydrolysation; characterised in that the carboxylic acid or amine is one which generates a gel content of at least 40% after 40 hours in a 90 ° C. cross-linking test which is conducted as follows: a copolymer of ethylene and vinyltrimethoxysilane having a MFR 2 (2.16 kg, 190° C.) of 2 g/10 min, a density of 923 g/cm 3 , and 2 wt.% of vinyltrimethoxysilane is provided, to which the carboxylic acid or amine is added in an amount of 4.5 mmol/kg to form a crosslinkable composition, said crosslinkable composition is formed to a tape of 1.7 mm thickness, and said tape is cross-linked in a waterbath at a temperature of 90 ° C.