Rosin modified phenolic resins are mainly used for offset printing ink. SEIKO PMC developed a rosin modified phenolic resin that can be used for high-speed printing and low-grade paper in the market. These resins impart functionality such as setting speed, pigment dispersibility, and water resistance to web offset, sheet-fed offset, and newspaper inks.
| Product name | Acid value | Melting point (℃) |
Viscosity*1 (dPas) |
Heptane tolerance**2 (ml/g) |
Characteristics |
|---|---|---|---|---|---|
| OR-357 | 20 MAX | 165～175 | 350～450 | 15～20 | Water resistance, Low misting |
| OR-490 | 21 MAX | 151～157 | 225～275 | 13～17 | Water resistance, Low misting |
| OR-534 | 20 MAX | 155～165 | 30～70 | 10～14 | Quickly drying, Water resistance |
| OR-190 | 20 MAX | 145～155 | 120～220 | 33～38 | Water resistance, High gloss |
| OR-581 | 32 MAX | 140～160 | 140～210 | 17～24 | Water resistance, Solvent solubility |
*1 Varnish for measurement resin: linseed-oil=35:65, measured by a vertical falling ball method (25℃)
*2 Solution for measurement resin: toluene=33.3:66.7, measured by heptane titration
