PROPYLENE-BASED TERPOLYMERS COMPOSITION FOR PIPES

摘要

A polyolefin composition comprising:;A) from 85.0 wt % to 99.5 wt %; A terpolymer containing propylene, ethylene and 1-hexene wherein:;(i) the content of 1-hexene derived units ranges from 1.0 wt % to 5.0%;;(ii) the content of ethylene derived units is comprised between 0.5 wt % and 10.0 wt %;(iii) the melting temperature ranges from 130° C. to 145° C.;;B) from 0.5 wt % to 10.0 wt %; of a propylene, ethylene copolymer composition comprising:;b1) from 12 wt % to 52 wt %; of a propylene homopolymer or a propylene/ethylene copolymer having a content of ethylene derived units ranging from 0.1 wt % to 4.5 wt %; and having a xylene soluble content measured at 25° C. lower than 10 wt %;;b2) from 48 wt % to 88 wt % of a propylene ethylene copolymer having a content of ethylene derived units ranging from 15.0 wt % to wt % to 42.0 wt %;;wherein the resulting polyolefin composition has an melt flow rate (230° C./5 kg. ISO 1133) ranging from 0.2 g/10 min to 4.0 g/10 min; the sum A+B being 100 and the sum b1+b2 being 100.

主权项

1. A polyolefin composition comprising:
A) from 85.0 to 99.5 wt. %, based upon the total weight of the polyolefin composition, of a terpolymer, wherein the terpolymer contains containing propylene, ethylene and 1-hexene derived units wherein:
(i) the content of 1-hexene derived units ranges from 1.0 to 5.0 wt. %, based upon the total weight of the terpolymer;(ii) the content of ethylene derived units is comprised between 0.5 and 10.0 wt. % based upon the total weight of the terpolymer(iii) the melting temperature ranges from 130° C. to 145° C.; B) from 0.5 to 15.0 wt. %, based upon the total weight of the polyolefin composition, of a copolymer comprising propylene and ethylene derived units, wherein the copolymer composition comprises:
b1) from 12 to 52 wt. %, based upon the total weight of the copolymer, of a propylene homopolymer or a propylene/ethylene copolymer having a content of ethylene derived units ranging from 0.1 to 4.5 wt. %; and having a xylene soluble content measured at 25° C. lower than 10 wt. %;b2) from 48 to 88 wt. %, based upon the total weight of the copolymer, of a propylene ethylene copolymer having a content of ethylene derived units ranging from 15.0 to 42.0 wt. %; wherein the polyolefin composition has an melt flow rate (230° C./5 kg. ISO 1133) ranging from 0.2 g/10 min to 4.0 g/10 min; the sum A+B being 100 and the sum b1+b2 being 100.