| 摘要 |
The present invention relates to a polyolefin composition comprising: (i) a crosslinkable polyolefin with hydrolysable silane groups Si(OA), where A is a hydrocarbon 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 is represented by the formulawhere Ris a non-hydrolysable saturated or unsaturated hydrocarbon group which comprises 2 to 30 carbon atoms and which may contain functional groups such as ester, amide, imide, ether, thioether or amine; and R, Rand Rare an acyloxy group, which forms a carboxylic acid upon hydrolysation, or an amino group which forms amine upon hydrolysation, wherein the acyloxy group is selected from the group consisting of Calkanoyloxy, Calkenoyloxy, Calkynoyloxy and Carenoyloxy, wherein the substituents at the N atom of the amino groups are selected from the group consisting of C-Calkyl, C-Calkenyl, C-Calkynyl and C-Carenyl groups, characterised in that acid or base formed upon hydrolysation 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 MFR=2 g/10 min, a density of 923 g/cm, and 2 wt.% of vinyltrimethoxysilane and then is cross-linked in a waterbath at 90°C. |
