Flame retardant polymer composition
View Patent ↗The present invention relates to a flame retardant polymer composition comprising a crosslinkable terpolymer comprising ethylene monomer units, a silane group containing comonomer units and comonomer units comprising a polar group; a metal carbonate filler and a silicone fluid or gum; wherein the content of the comonomer units comprising a polar group is between 2 and 25 wt % of the terpolymer and the content of the silane group containing comonomer units is between 0.2 and 4 wt % of the terpolymer. The present invention is also directed to the process for the production of the polymer composition, to a cable and/or to an electrical device having a layer comprising said polymer composition, and uses thereof.
1. A flame retardant polymer composition comprising:
(A) a crosslinkable terpolymer comprising ethylene monomer units, a silane group containing comonomer units and comonomer units comprising a polar group;
(B) a metal carbonate filler;
(C) a silicone fluid or gum; and
(D) a scorch retarder,
wherein the content of the comonomer units comprising a polar group is between 2 and 25 wt % of the terpolymer and the content of the silane group containing comonomer units is between 0.2 and 4 wt % of the terpolymer.
2. The polymer composition according to claim 1 wherein the polar groups are selected from the groups consisting of acrylic acids, methacrylic acids, acrylates, methacrylates, and vinyl ester.
3. The polymer composition according to claim 1 wherein the terpolymer is present in an amount of 38 to 65 wt % of the total polymer composition.
4. The polymer composition according to claim 1 wherein the terpolymer has a MFR 2.16, 190° C. between 0.1 to 10 g/10 min.
5. The polymer composition according to claim 1 wherein the metal carbonate filler is present in an amount between 10 to 62 wt % of the total polymer composition.
6. The polymer composition according to claim 1 wherein the silicone fluid or gum is present in an amount between 0.1 to 20 wt % of the total polymer composition.
7. The polymer composition according to claim 1 comprising:
(A) an ethylene/ethyl-acrylate or butyl-acrylate/vinyltrimethoxysilane terpolymer;
(B) a silicon fluid or gum;
(C) calcium carbonate;
(D) a scorch retarder,
and wherein (A), (B), (C) and (D) together amount to at least 97 wt % of the total polymer composition.
8. A cable having a layer comprising the polymer composition of claim 1 .
9. The cable of claim 8 wherein the polymer composition is crosslinked.
10. The cable according to claim 8 which is a photovoltaic cable.
11. The cable according to claim 9 which is a photovoltaic cable.
12. A photovoltaic solar module having a layer comprising the polymer composition of claim 1 .