Resin composition and power cable
A resin composition, including: a resin component containing propylene units, and a resistance-imparting agent, wherein the resistance-imparting agent is a monomer having a phenol skeleton with hydrogen or an alkyl group having 1 to 3 carbon atoms, bonded to at least one of ortho positions to the hydroxyl group of the phenol skeleton, and has a melting point of 215° C. or less and a molecular weight of 200 or more and 500 or less, a content of the resistance-imparting agent is 0.4 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component, and a content ratio of metal impurities is 0.02% by volume or less.
1 . A resin composition, comprising:
a resin component containing propylene units, and
a resistance-imparting agent,
wherein the resin component comprises a propylene-based resin and a flexible component containing a low-crystallinity resin and a styrene-based resin,
wherein the low-crystallinity resin is a copolymer obtained by copolymerization of at least any two of ethylene, propylene, butene, hexene, and octene, and has no melting point or has a melting point of 100° C. or less,
wherein the resistance-imparting agent is a monomer having a phenol skeleton with hydrogen or an alkyl group having 1 to 3 carbon atoms, bonded to at least one of ortho positions to the hydroxyl group of the phenol skeleton, and has a melting point of 215° C. or less and a molecular weight of 200 or more and 500 or less,
a content of the resistance-imparting agent is 0.4 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component, and
a content ratio of metal impurities is 0.02% by volume or less.
2 . A power cable, comprising:
a conductor, and
an insulating layer coated on an outer circumference of the conductor,
wherein the insulating layer is formed from a resin composition,
the resin composition comprises a resin component containing propylene units, and a resistance-imparting agent,
wherein the resin component comprises a propylene-based resin and a flexible component containing a low-crystallinity resin and a styrene-based resin,
wherein the low-crystallinity resin is a copolymer obtained by copolymerization of at least any two of ethylene, propylene, butene, hexene, and octene, and has no melting point or has a melting point of 100° C. or less,
the resistance-imparting agent is a monomer having a phenol skeleton with hydrogen or an alkyl group having 1 to 3 carbon atoms, bonded to at least one of ortho positions to the hydroxyl group of the phenol skeleton, and has a melting point of 215° C. or less and a molecular weight of 200 or more and 500 or less,
a content of the resistance-imparting agent is 0.4 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component, and
a content ratio of metal impurities is 0.02% by volume or less.
3 . The power cable according to claim 2 ,
wherein the resistance-imparting agent has a linear carbon structure having 5 or more and 10 or less carbon atoms.
4 . The power cable according to claim 2 ,
wherein the resistance-imparting agent contains a sulfur atom.
5 . The power cable according to claim 2 ,
wherein the resistance-imparting agent has a melting point such that it becomes liquid at 27° C.
6 . The power cable according to claim 2 ,
wherein the resistance-imparting agent is a phenolic antioxidant.
7 . The power cable according to claim 2 ,
wherein the resin composition comprises as the propylene-based resin a propylene homopolymer having a melting point of 160° C. or more and 175° C. or less and an enthalpy of fusion of 100 J/g or more and 120 J/g or less, and
the resin composition has a melting point of 158° C. or more and 168° C. or less and an enthalpy of fusion of 55 J/g or more and 110 J/g or less.
8 . The power cable according to claim 2 ,
wherein the resin composition comprises as the propylene-based resin a propylene random copolymer having a melting point of 140° C. or more and 155° C. or less and an enthalpy of fusion of 90 J/g or more and 105 J/g or less, and
the resin composition has a melting point of 140° C. or more and 150° C. or less, and an enthalpy of fusion of 55 J/g or more and 100 J/g or less.
9 . A resin composition, comprising:
a resin component containing propylene units, and
a resistance-imparting agent,
wherein the resin component comprises 55 to 95 parts by mass of a propylene-based resin, and 5 to 45 parts by mass of a flexible component containing a low-crystallinity resin and a styrene-based resin,
wherein the resistance-imparting agent is a monomer having a phenol skeleton with hydrogen or an alkyl group having 1 to 3 carbon atoms, bonded to at least one of ortho positions to the hydroxyl group of the phenol skeleton, and has a melting point of 215° C. or less and a molecular weight of 200 or more and 500 or less,
a content of the resistance-imparting agent is 0.4 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin component, and
a content ratio of metal impurities is 0.02% by volume or less.