Conventional acrylic resins based on acrylic monomers and styrene monomer are soluble only in blends of polar and aromatic solvents and have limited miscibility with aliphatic solvents.
This limits their use in conjunction with the traditional white spirit based alkyd enamels and water based coatings used in the building sector.
To counter this, Goodyear developed the Pliolite® range of thermoplastic copolymers based on acrylic and vinyl toluene monomers.
These polymers, which are produced using suspension polymerisation techniques, are supplied in granular form and then are simply dissolved in aliphatic hydrocarbon solvent using high speed mixers.
These polymers offer faster drying, superior colour and exterior durability when compared with alkyd coatings and are much less prone to cracking. The gloss achievable is somewhat less however, and reflow characteristics, when brush applied, are poorer leaving some brush marking.
Compared with water based coatings, Pliolite® based paints can be applied over a much broader range of climatic conditions and they generally offer a longer life than their water-borne analogues.
However the continued use of solvent does restrict the long term future of these coatings on environmental grounds and because of the solvent odour their use in interior applications is unpopular.
The problem of odour, though not VOC, has been much reduced by the development of vinyl acrylate copolymers which are soluble in low aromatic and de-aromatised hydrocarbons4. Pliolite® VT and Plioway® resins from Goodyear may be used with aromatic free hydrocarbons, such as the Exxsol D series from (Esso / Exxon), or the isoparaffinic, low odour solvents, such as Shellsol T (Shell) or the Isopar range (Esso).