Patent ID: 8299166

Claim:
A process for producing an article comprising extrusion of a polyolefin composition comprising i. a crosslinkable polyolefin with hydrolysable silane groups (A), and ii. a master batch composition, comprising: (iia) a matrix polymer, and (iib) a silanol condensation catalyst comprising an organic sulphonic acid (B), the organic sulphonic acid (B) comprising one or more sulphonic acid groups and a structural element Ar—R 1 (I) wherein Ar is an aromatic group, and R 1 is an organic residue comprising at least 21 C-atoms, and wherein Ar may comprise from one to four R 1 organic residues, and wherein the extrusion is conducted at a temperature in the range of 140 to 280° C., and wherein the composition is cross-linked to a maximum torque level of more than 50 Nm at a cross-linking rate of above 0.12 Nm/s.