| 摘要 |
The present invention provides a water-borne coating system comprising a top-coat polymer and a base-coat polymer each in dispersion, and including a component that results in increased mobility of the top-coat polymer relative to the base-coat polymer. Preferably, excess surfactant is used to increase the mobility of the top-coat polymer by the formation of micelles, and the curing agent acts to aggregate the base-coat polymer before the curing reaction and whilst segregation occurs. Suitable surfactants include ethylene oxide copolymers and ethoxylated nonylphenol. Preferably non-ionic stabilisation is used for the top-coat dispersion. |
