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US 11,453,764 B2Granted
Strand-shaped elements and polymer composition for preparing same
AssigneeLEONI Kabel GmbH
InventorsLydie Delineau, Martin Egli, Melanie Eggert, Henrich Krump, Vladimir Kwapulinsky
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Abstract
The invention relates to strand-shaped elements and polymer compositions used for preparing the strand-shaped elements. The strand-shaped elements comprise an inner structure and a halogen-free polymer composition surrounding the inner structure. The polymer composition includes a linear very low density polyethylene (VLDPE) composition and one or more polyolefin-elastomers. In addition, the polymer composition includes a flame retardant filler.
Claims14
Strand-shaped element comprising:
- (i) an inner structure;
- and
- (ii) a polymer composition surrounding the inner structure, wherein the polymer composition is obtainable or obtained by compounding at least the following components:
- (a) 24-32 wt.-% of a mixture of linear very low density polyethylene (VLDPE) compositions, wherein said mixture comprises 20-26 wt.-% of a first composition having a density in the range from 0.85 g/cm3 to 0.95 g/cm3, as measured according to ISO 1183, and 1-7 wt.-% of a second composition having a density in the range from 0.85 g/cm3 to 0.95 g/cm3, as measured according to ISO 1183;
- (b) 10-17 wt.-% of a polyolefin-elastomer, which is an ultra-low density random ethylene-octene copolymer having a glass transition temperature of below −50° C., as determined in the polymer composition or in pure form and a melting point of below 40° C., and wherein the polyolefin-elastomer has a density in the range from 0.80 g/cm3 to 0.90 g/cm3, as measured according to ASTM D792, and wherein the polyolefin-elastomer has an elongation at break of at least 1000%, as measured by ASTM D638;
- (c) a flame retardant filler in an amount of 55-65 wt-%, which is aluminum hydroxide;
- (d) 0.1-3.0 wt.-% of an antioxidant;
- and
- (e) 0.5-2.5 wt.-% of a coupling agent composition;
- and wherein
- the polymer composition has
- an elongation at break in the range from 150% to 500%, as measured by IEC 60811-501, and
- wherein the strand-shaped element is obtainable or obtained by applying the polymer composition of (ii) by extrusion to the inner structure.
10 more elements
Strand-shaped element comprising:
- (i) an inner structure;
- and
- (ii) a polymer composition surrounding the inner structure, wherein the polymer composition is obtainable or obtained by compounding at least the following components:
- (a) 24-32 wt.-% of a mixture of two different types of linear very low density polyethylene (VLDPE) compositions, wherein said mixture comprises 20-26 wt.-% of a first composition having a density in the range from 0.85 g/cm3 to 0.95 g/cm3, as measured according to ISO 1183, and 1-7 wt.-% of a second composition having a density in the range from 0.85 g/cm3 to 0.95 g/cm3, as measured according to ISO 1183;
- (b) 10-17 wt.-% of a polyolefin-elastomer, which is an ultra-low density random ethylene-octene copolymer having a glass transition temperature of below −50° C., as determined in the polymer composition or in pure form and a melting point of below 40° C., and wherein the polyolefin-elastomer has a density in the range from 0.80 g/cm3 to 0.90 g/cm3, as measured according to ASTM D792, and wherein the polyolefin-elastomer has an elongation at break of at least 1000%, as measured by ASTM D638;
- (c) a flame retardant filler in an amount of 55-65 wt.-%, which is aluminum hydroxide;
- (d) 0.1-3.0 wt.-% of an antioxidant;
- and
- (e) 0.5-2.5 wt.-% of a coupling agent composition;
- and wherein
- the polymer composition has
- a strength at break in the range from 7.5 MPa to 15.0 MPa, as measured by IEC 60811-501, and
- wherein the strand-shaped element is obtainable or obtained by applying the polymer composition of (ii) by extrusion to the inner structure.
10 more elements
Dependencies are inferred from the claim text.