15 июля, 2015 
Malyar Hybrid systems represent a group of resins which combine more than one generic class of polymer. The technique is akin to the surfactant free approach through which the phases are of different generic classes.
The most widely used commercial techniques are the dispersed phase which is either acrylic or styrene acrylic and the continuous phase is either polyester or polyurethane, either of which has been modified so that they are water soluble.
One typical example is a urethane-acrylic. The resultant resin combines the technical advantages of the urethane polymer to provide adhesion to low energy surfaces, impact resistance and solvent resistance, with the best features of acrylics, mainly transparency and UV resistance, and, to some extent, cost.
An important advantage of this technology is the benefit of being able to combine performance attributes to achieve specific end use performance specifications without need to resort to more expensive, speciality, functional monomers or post additives.
Some commercial products derived by this route claim a degree of grafting during the polymerisation process which results in further improvements in film properties.
The use of an epoxy acrylic dispersion to stabilise subsequent emulsion polymerisation for internal can lacquers is patented by ICI(4). Consult Section VII for further details of the preparation of the epoxy graft acrylic waterborne resin. In essence, acrylic comonomers including methacrylic acid are copolymerised using a peroxide initiator in the presence of an epoxy resin dissolved in butanol and butyl glycol. Upon completion of polymerisation which involves some degree of grafting of the acrylic onto the epoxy resin (see Epoxy book for further details), the acid groups are neutralised with a tertiary amine and the resin is then dispersed or inverted in water.
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