A new and improved thermal printing ink ribbon includes a heat-resistant base, a release layer disposed on the base including an ester wax and a rubber copolymer containing a specified aromatic monomer content and an ink layer disposed on the release layer by a solvent or hot-solvent process. The thermal...http://www.google.com.au/patents/US5908252?utm_source=gb-gplus-sharePatent US5908252 - Thermal printing ink ribbon
