Cross-linkable polyolefin composition comprising a first and a second olefin polymer
The present invention relates to a cross-linkable polyolefin composition comprising a first olefin polymer (A) comprising a first comonomer comprising epoxy groups, and a second olefin polymer (B) comprising a second comonomer comprising carboxylic acid groups and/or precursor thereof.
1. A cable comprising at least one layer comprising a cross-linkable polyolefin composition comprising:
20 wt % to 95 wt % based on the total amount of said polyolefin composition of a first olefin polymer (A) comprising a first comonomer comprising epoxy groups, and
5 to 60 wt % based on the total amount of said polyolefin composition of a second olefin polymer (B) comprising a second comonomer comprising carboxylic acid groups and/or precursor thereof;
wherein the cross-linkable polyolefin composition is substantially free of curing agents.
2. The cable according to claim 1 , wherein said first comonomer comprising epoxy groups is aliphatic glycidyl methacrylate comonomer.
3. The cable according to claim 1 , wherein the amount of said first comonomer is at least 0.1 wt %, or at least 0.5 wt %, or at least 1 wt %, based on the amount of said first olefin polymer (A).
4. The cable according to claim 1 , wherein the amount of said first comonomer is 20 wt % or less, or 15 wt % or less, or 10 wt % or less, or 5 wt % or less, based on the amount of said first olefin polymer (A).
5. The cable according to claim 1 , wherein said second comonomer comprising carboxylic acid groups is acrylic acid comonomer.
6. The cable accordingly to claim 1 , wherein the amount of said second comonomer is from 0.1 to 20 wt %, based on the amount of said second olefin polymer (B).
7. The cable accordingly to claim 1 , wherein said cross-linkable polyolefin composition further comprises a third olefin polymer (C).
8. A cable comprising at least one layer comprising a cross-linked polyolefin composition cured in the absence of curing agents comprising:
20 wt % to 95 wt % based on the total amount of said polyolefin composition of a first olefin polymer (A) comprising a first comonomer comprising epoxy groups, and
5 to 60 wt % based on the total amount of said polyolefin composition of a second olefin polymer (B) comprising a second comonomer comprising carboxylic acid groups and/or a precursor thereof.
9. The cable according to claim 8 , wherein said cross-linked polyolefin composition has hotset elongation measured according to IEC 60811-2-1 of below 175%.
10. The cable according to claim 8 , wherein the gel content of the cross-linked polyolefin composition is at least 50%, or at least 60%, or at least 70%.