STABILIZED HIGH DENSITY POLYETHYLENE WITH IMPROVED RESISTANCE TO DAMAGE AND STABILIZED SYSTEM

摘要

1. The composition of high density polyethylene (HDPE) with improved resistance to damage in the presence of chlorinated and non-chlorinated water at a temperature in the range from about 0 ° C to 100 ° C and consisting mainly of: a) HDPE; b) an effective amount of shielded phenol antioxidant ; c) an effective amount of an antioxidant phosphonite or phosphine; d) an effective amount of a stabilizing synthetic or natural hydrotalcite; and e) additionally one or more additives other than the components from paragraph (b) to (d). 2. The HDPE composition according to claim 1, consisting mainly of: a) HDPE; b) from about 0.05 to about 0.5 wt.%, Based on the weight of (a) an antioxidant of screened phenol; c) from about 0, 02 to about 0.5 wt.%, Based on the weight of (a), an antioxidant phosphonite or phosphine; d) from about 0.01 to about 1.0 wt.%, Based on the weight of (a), stabilizing synthetic or natural hydrotalcite; and e) additionally one or more additives other than the components from point (b) to (d), in each case in an amount of from about 0.01 to about 3.0 wt.%, based on the weight of (a) .3. The HDPE composition according to claim 1, characterized in that the HDPE (a) corresponds to at least one of the following provisions (a) to (a): a) HDPE has a molecular weight distribution that is at least bimodal; and / or a) HDPE has a density of ≥0.946 g / cm, VIR ≤20 g / 10 min .; and / or a) HDPE has at least one fraction of a polyethylene resin with a density of ≥0.965 g / s MI from 50-400 g / 10 min. 4. A HDPE composition according to claim 1, characterized in that the screened phenol antioxidant (b) is a screened phenol of formula (I) where: z is an integer from 1 to 4; R is a C-C secondary or tertiary alkyl group, C-C cycloalkyl group, or