Colored salts of polymeric sulfonate polyanions and dye cations, and light-absorbing coatings made therewith

摘要

Light-stable film-forming salts of a sulfonated polymer, especially a sulfonated polyester, and a cationic dye. When these dye-polysalts are coated onto shaped polymeric structures, especially transparent self-supporting films, the resultant products have important optical uses. A polyester film coated with certain red or amber blends of dye-polysalts and provided with a pressure-sensitive adhesive coating is useful as a lithographers' tape.