Polymer composition for pipes having very good impact properties and slow crack growth resistance
AssigneeBorealis AG
InventorsAndrey BURYAK, Victor SUMERIN
Life of this patent
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Abstract
A polymer composition comprising a base resin, the base resin comprising (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene-hexene-1 copolymer fraction, wherein fraction (A) has a lower molecular weight than fraction (B), wherein the polymer composition has a content of 1-hexene of more than 1.5 wt % with respect to the total weight of the polymer composition; wherein the weight ratio of the fraction (A) to the fraction (B) is from 44:56 to 35:65; wherein the base resin has a density of equal to or higher than 945 kg/m3, and wherein the polymer composition has a MFR5 (190° C., 5 kg) of equal to or higher than 0.5 g/10 min and equal to or lower than 0.7 g/10 min.
Claims20
A polymer composition comprising a base resin, the base resin comprising:
- (A) a first ethylene homo-or copolymer fraction, and
- (B) a second ethylene-hexene-1 copolymer fraction,
- wherein fraction (A) has a lower molecular weight than fraction (B),
- wherein the polymer composition has a content of units derived from 1-hexene of more than 1.5 wt % with respect to the total weight of the polymer composition;
- wherein the weight ratio of the fraction (A) to the fraction (B) is from 44:56 to 35:65;
- wherein the base resin has a density measured according to ISO 1183-1:2004 (method A) of equal to or higher than 945 kg/m3, and
- wherein the polymer composition has a melt flow rate MFR5 (190° C., 5 kg) determined according to ISO 1133 of equal to or higher than 0.5 g/10 min and equal to or lower than 0.7 g/10 min.
(canceled)
Dependencies are inferred from the claim text.