Seatons Natural Oils for use in printing inks
Vegetable oils have various applications in the printing ink industry, both as replacements for mineral oils and on their own merits. The advantages over mineral oils include low volatility and low toxicity, as well as being renewable resources. The oils can be used in a variety of ways including:
- The production of alkyds for use in inks
- As a raw material in ink varnishes, solutions and mediums
- As an additive in ink formulations
This page outlines several oils that can be used to produce printing inks.
Oxidised castor oil (blown castor oil)
Blown castor oil, particularly 30 poise, can be used as a plasticiser in printing inks and may possibly replace phthalate esters. It can also be used as an additive in lithographic inks.
Dehydrated castor oil
Dehydrated castor oil has a low residual odour and can be used in gloss and overprint varnishes to give pale coloured films that have good colour retention on air drying or stoving. It can also be used for metal decorative inks due to its pale colour and excellent flexibility
Refined linseed oil
Due to its ability to dry to an even film, refined linseed oil can be used as a binder in sheet-fed offset inks. It is also a major constituent for oleoresinous printing ink varnishes, where the oil is reacted with one or more resins and is then let down in a high boiling point solvent. Refined linseed oil is also used as an additive in heat set and cold set printing inks. Alkyd resins for use in printing inks can also be made from refined linseed oil.
Acid refined linseed oil
This product is low in viscosity, pale in colour and has an enhanced acidity. The acidity is carefully controlled and the oil is produced to a specific acid value. This free acidity contributes to improved pigment wetting properties, thus giving excellent dispersing qualities.
Polymerised linseed oil (linseed stand oil)
High viscosity polymerised linseed oil can be used as an additive in heat set printing inks.
Refined soyabean oil
This product can be made into alkyds that give excellent colour retention and adhesion to tin printing inks. It can also be used in overprint varnishes (OPV) and web-offset inks, and it also has good pigment wetting properties, especially with carbon blacks for application in newsprint.
Wood oil is a major component of oleoresinous varnishes, along with various types of resins.
These varnishes make good vehicles for lithographic inks. Wood oil can also be used in gloss overprint varnishes and metallic inks.