| 主权项 |
1. A laser-engraveable composition comprising:
one or more elastomeric rubbers comprising one or more controlled long chain branching ethylene-propylene-diene (CLCB EPDM) elastomeric rubbers, in an amount of at least 40 weight % and up to and including 70 weight %, based on the total laser-engravable composition weight, one or more non-controlled long chain branching ethylene-propylene-diene (non-CLCB EPDM) elastomeric rubbers having a number average molecular weight of at least 20,000 and up to and including 800,000, in an amount of at least 40 phr and up to and including 60 phr, wherein the weight ratio of the one or more controlled long chain branching ethylene-propylene-diene (CLCB EPDM) elastomeric rubbers to the one or more non-controlled long chain branching ethylene-propylene-diene (non-CLCB EPDM) elastomeric rubbers is at least 1:1 and up to and including 3:1, at least 2 phr and up to and including 30 phr of a conductive or non-conductive carbon black, carbon fibers, or carbon nanotubes as a near-infrared radiation absorber, and at least 1 phr and up to and including 80 phr of an inorganic, non-infrared radiation absorber filler that is zinc oxide particles, silica particles, calcium carbonate particles, or any mixture thereof, wherein the weight ratio of the near-infrared radiation absorber to the inorganic, non-infrared radiation absorber filler is from 1:20 to 10:1, wherein the laser-engraveable composition exhibits a Mooney viscosity of at least 40 and up to and including 60. |
