Wire sheathing and insulation compositions
AssigneesSACO AEI Polymers, Inc., AEI Compounds Ltd.
InventorsMike Edward Slevin, David Geraint Roberts
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Abstract
Halogen-free polymer composite materials, which are commonly for use in sheathing and insulation applications for wire and cable, are provided. The composite materials include a polymeric blend, which includes ethylene/α-olefin copolymer and polyolefin, a hydrated metal oxide flame-retardant, such as hydrated magnesium oxide, and an antimony compound. In some instances, the polymeric blend may include an olefin/unsaturated ester copolymer.
Claims35
A halogen-free polymer composite comprising:
- (A) 100 parts by weight polymer material, which comprises
- about 30 to 75 wt % ethylene/α-olefin copolymer;
- and
- about 25 to 60 wt % polyolefin;
- (B) about 50 to 175 parts by weight hydrated metal oxide flame-retardant;
- and
- (C) about 30 to 100 parts by weight antimony compound.
A halogen-free polymer composite comprising:
- about 10 to 25 wt % ethylene/α-olefin copolymer, which comprises ethylene/α-octene plastomer having a melt flow rate of about 1-40 g/10 min (2.16 kg @ 190° C.) and a melting point of about 70-80° C.;
- about 10 to 15 wt % linear low density polyethylene having a melt flow rate (as determined pursuant to ASTM D 1238) of about 1-5 g/10 min (2.16 kg @ 190° C.), a Vicat softening point of about 90-110° C. (as determined pursuant to ASTM D 1525);
- about 20 to 50 wt % precipitated magnesium dihydroxide having an average particle size of no more than about 2 microns;
- wherein the magnesium dihydroxide is optionally treated with a vinyl silane coating;
- and
- about 20 to 35 wt % antimony trioxide;
- wherein the composite comprises silane-grafted ethylene/α-olefin copolymer and/or silane-grafted polyethylene.
A halogen-free polymer composite comprising:
- (A) 100 parts by weight polymer material, which comprises
- about 30 to 60 wt % ethylene/α-olefin copolymer;
- about 30 to 60 wt % polyethylene;
- and
- zero to about 30 wt % olefin/unsaturated ester copolymer;
- wherein the polymer material comprises silane-grafted ethylene/α-olefin copolymer and/or silane-grafted polyethylene;
- (B) about 50 to 150 parts by weight hydrated magnesium oxide;
- and
- (C) about 30 to 75 parts by weight antimony compound;
- wherein the total of the hydrated magnesium oxide and the antimony compound constitutes about 50-70 wt % of the composite.
A halogen-free polymer composite comprising:
- (A) 100 parts by weight polymer material, which comprises
- about 50 to 70 wt % ethylene/α-olefin copolymer;
- and
- about 30 to 50 wt % polyethylene;
- (B) about 70 to 150 parts by weight hydrated magnesium oxide flame-retardant;
- and
- (C) about 50 to 100 parts by weight antimony compound;
- wherein the composite includes about 20 to 35 wt % of the antimony compound;
- and the total amount of the hydrated magnesium oxide and the antimony compound is about 50-70 wt % of the composite.
Dependencies are inferred from the claim text.