Flame retardant polypropylene composition
View Patent ↗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 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; and
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.
2. The composition of claim 1 wherein the MFR 2 of the heterophasic propylene copolymer is below 0.5 g/10 min.
3. 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.
4. 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.
5. 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.
6. The composition according to claim 1 wherein the base resin further comprises a polar ethylene copolymer.
7. The composition according to claim 6 wherein the polar ethylene copolymer is ethylene butylacrylate (EBA).
8. The composition according to claim 6 wherein the polar 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 base resin further comprises an ethylene copolymer having a density between 0.860 to 0.910 g/cm 3 .
10. The composition according to claim 9 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.
11. The composition according to claim 1 wherein metal hydroxide b) comprises magnesium hydroxide.
12. The composition according to claim 1 wherein the heterophasic propylene copolymer has a total amount of ethylene between 1 and 7 wt %, based on the total weight of the heterophasic propylene copolymer.
13. 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 4 and 13 wt % based on the total weight of the heterophasic propylene copolymer and determined according to ISO 16152; and
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.
14. The composition according to claim 13 wherein the heterophasic propylene copolymer has a total amount of ethylene between 1 and 7 wt %, based on the total weight of the heterophasic propylene copolymer.
15. The composition of claim 13 wherein the MFR 2 of the heterophasic propylene copolymer is below 0.5 g/10 min.
16. The composition according to claim 13 wherein the base resin a) and the metal hydroxide b) make up to 80 wt % of the total composition.
17. The composition according to claim 13 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.
18. The flame retardant composition of claim 1 , the heterophasic propylene copolymer has a total amount of ethylene between 1 and 5 wt %, based on the total weight of the heterophasic propylene copolymer.
19. The flame retardant composition of claim 13 , the heterophasic propylene copolymer has a total amount of ethylene between 1 and 5 wt %, based on the total weight of the heterophasic propylene copolymer.