Flame retardant polypropylene composition
The present invention relates to a flame retardant polypropylene composition for a conduit, appliance, and/or automotive wire, comprising a flame retardant composition comprising: a) a base resin comprising a heterophasic propylene copolymer which comprises a polypropylene homo- or copolymer matrix and an ethylene propylene rubber dispersed in said matrix, and b) a metal hydroxide or hydrated compound, wherein the heterophasic propylene copolymer has a MFR 2 below 0.8 g/10 min and a xylene cold soluble (XCS) fraction content between 1 and 15 wt % based on the total weight of the heterophasic propylene copolymer.
1. A flame retardant composition comprising:
a) a base resin consisting of a heterophasic propylene copolymer which comprises a polypropylene homo- or copolymer matrix and an ethylene propylene rubber dispersed in said matrix, and
b) a metal hydroxide,
wherein the heterophasic propylene copolymer has a MFR 2 below 0.8 g/10 min and a xylene cold soluble (XCS) fraction content between 1 and 15 wt % based on the total weight of the heterophasic propylene copolymer.
2. The composition of claim 1 wherein the heterophasic propylene copolymer has a total amount of ethylene between 1 and 8.5 wt % based on the total weight of the heterophasic propylene copolymer.
3. The composition of claim 1 wherein the MFR 2 of the heterophasic propylene copolymer is below 0.5 g/10 min.
4. The composition according to claim 1 wherein the base resin a) and the metal hydroxide b) make up to 80 wt % of the total composition.
5. The composition according to claim 1 wherein the base resin a) is present in the composition in an amount between 30 and 52 wt % and the metal hydroxide b) in an amount from 47 to 62 wt % based on the total weight of the composition.
6. The composition according to claim 1 wherein the composition comprises 40 to 45 wt % of the heterophasic propylene copolymer and 55 to 60 wt % of the metal hydroxide based on the total weight of the composition.
7. A flame retardant composition comprising:
a) a base resin comprising a heterophasic propylene copolymer which comprises a polypropylene homo- or copolymer matrix and an ethylene propylene rubber dispersed in said matrix, and
b) a metal hydroxide,
wherein the heterophasic propylene copolymer has a MFR 2 below 0.8 g/10 min and a xylene cold soluble (XCS) fraction content between 1 and 15 wt % based on the total weight of the heterophasic propylene copolymer;
wherein the base resin further comprises an ethylene copolymer having a density between 0.860 to 0.910 g/cm 3 .
8. The composition according to claim 7 wherein the ethylene copolymer is present in the composition in an amount between 2 to 30 wt % based on the total weight of the composition.
9. The composition according to claim 1 wherein the metal hydroxide b) comprises magnesium hydroxide.
10. A flame retardant composition comprising:
a) a base resin comprising a heterophasic propylene copolymer which comprises a polypropylene homo- or copolymer matrix and an ethylene propylene rubber dispersed in said matrix, and
b) a metal hydroxide,
wherein the heterophasic propylene copolymer has a MFR 2 below 0.8 q/10 min and a xylene cold soluble (XCS) fraction content between 1 and 15 wt % based on the total weight of the heterophasic propylene copolymer;
wherein the base resin further comprises an ethylene butylacrylate (EBA) having a density between 0.860 to 0.910 g/cm 3 .
11. The composition according to claim 5 wherein the metal hydroxide b) comprises magnesium hydroxide.
12. The composition according to claim 7 wherein the metal hydroxide b) comprises magnesium hydroxide.