POLYOLEFIN COMPOSITION FOR ENHANCED LASER PRINTING
A polyolefin composition for use as an outer layer of a cable is described, wherein the polyolefin composition comprises a multimodal olefin copolymer and carbon black and UV agent; wherein the multimodal olefin copolymer has density of 0.915-0.960 g/cm3, MFR2 of 0.1-10 g/10 min, wherein carbon black in the polyolefin composition is present in an amount of 0.25-1 wt %, and wherein the polyolefin composition has shrinkage of 1% or lower.
1 . A polyolefin composition, wherein said polyolefin composition comprises a multimodal olefin copolymer and carbon black and UV agent;
wherein said multimodal olefin copolymer has density of 0.915-0.960 g/cm 3 , MFR2 of 0.1-10 g/10 min,
wherein carbon black in said polyolefin composition is present in an amount of 0.25-1 wt %, and
wherein said polyolefin composition has shrinkage of 1% or lower.
2 . The polyolefin composition according to claim 1 , wherein said UV agent is present in said polyolefin composition in an amount of 0.1-1 wt %.
3 . The polyolefin composition according to claim 1 , wherein said UV agent is a mixture of equal amounts of dimethyl succinate polymer with 4-hydroxy-2,2,6,6,-tetramethyl-1-piperidineethanol and poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]).
4 . The polyolefin composition according to claim 1 , wherein said composition further comprises an antioxidant or an antistatic agent, or both.
5 . The polyolefin composition according to claim 4 , wherein said antistatic agent is stearate.
6 . The polyolefin composition according to claim 4 , wherein said antioxidant is a mixture of equal amounts of pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and tris(2,4-di-tert-butylphenyl) phosphite.
7 . The polyolefin composition according to claim 1 , wherein said multimodal olefin copolymer is an ethylene polymer mixture.
8 . The polyolefin composition according to claim 1 , wherein said multimodal olefin copolymer is a bimodal polymer mixture of a low molecular weight ethylene homo- or copolymer and a high molecular weight copolymer of ethylene and a comonomer selected from the list consisting of 1-butene, 4-methyl-1-pentene, 1-hexene or 1-octene.
9 . The composition according to claim 1 , wherein the multimodal olefin copolymer mixture is a bimodal polymer mixture of a low molecular weight ethylene homopolymer and a high molecular weight copolymer of ethylene and 1-butene.
10 . The polyolefin composition according to claim 1 , wherein the amount of carbon black in said polyolefin composition is 0.25-0.75 wt %, preferably 0.25-0.5 wt %.
11 . The polyolefin composition according to claim 1 , wherein the shrinkage is 0.70% or lower, preferably of 0.60% or lower.
12 . A method of inducing print on an outer layer of a cable, wherein said outer layer comprises a polyolefin composition according to claim 1 , and said print is induced by laser radiation.
13 . The method according to claim 12 , wherein the frequency of said laser is 20-100 kHz.
14 . The method according to claim 12 , wherein the power of said laser is 2-50W.
15 . An outer layer of a cable, comprising a polyolefin composition according to claim 1 .